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the qme48t40050 converter of the qme - series provides outstanding thermal performance in high temperature environments. this performance is accomplished through the use of patented/patent - pending circuits, packaging, and processing techniques to achieve ul tra - high efficiency, excellent thermal management, and a low - body profile. the low - body profile and the preclusion of heat sinks minimize impedance to system airflow, thus enhancing cooling for both upstream and downstream devices. the use of 100% automat ion for assembly, coupled with advanced electronic circuits and thermal design, results in a product with extremely high reliability. operating from a 36 - 75 v input, the qme - series converters provide outputs that can be trimmed from C 20% to +10% of the nom inal output voltage, thus providing outstanding design flexibility. ? 36 - 75 vdc input ? 5 vdc @ 40 a output ? industry - standard quarter - brick pinout ? on - board input differential lc - filter ? start - up into pre - biased load ? no minimum loa d required ? dimensions: 1.45 x 2.30 x 0.445 (36.83 x 58.42 x 11.3 mm) ? weight: 1.22 oz [34.98 g] ? withstands 100 v input transient for 100 ms ? fixed - frequency operation ? fully protected ? latching and non - latching protection available ? remote output sense ? po sitive or negative logic on/off option ? output voltage trim range: +10%/?20% with industry - standard trim equations ? high reliability: mtbf = 9.7 million hours, calculated per telcordia tr - 332, method i case ? approved to the latest edition of the following safety standards: ul/csa 60950 - 1, en60950 - 1 and iec60950 ? designed to meet class b conducted emissions per fcc and en55022 when used with external filter ? all materials meet ul94, v - 0 flammability rating
2 q me48t400 5 0 tech.support@ psbel.com conditions: t a = 25 oc, airflow = 300 lfm (1.5 m/s) , unless otherwi se specified. parameter description / condition min typ max units absolute maximum ratings input voltage continuous 0 80 vdc operating ambient temperature - 40 85 c storage temperature - 55 125 c isolation characteristics i/o isolatio n 2000 vdc isolation capacitance 3 f isolation resistance 10 m ? feature characteristics switching frequency 440 khz output voltage trim range 1 industry - std. equations - 20 +10 % remote sense compensation 1 percent of vout(nom) +10 % output overvoltage protection latching or non - latching 117 122 127 % overtemperature shutdown (pcb) non - latching 125 c auto - restart period (for non - latching option) applies to all protection features 200 ms turn - on time 4 ms on/off control ( positive logic) converter off (logic low) - 20 0.8 vdc converter on (logic high) 2.4 20 vdc on/off control (negative logic) converter off (logic high) 2.4 20 vdc converter on (logic low) - 20 0.8 vdc input characteristics operating input voltage r ange 36 48 75 vdc input under voltage lockout non - latching turn - on threshold 33 34 35 vdc turn - off threshold 31 32 33 vdc input voltage transient 100 ms 100 vdc maximum input current 40 adc, 5.0 vdc out @ 36 vdc in 6.1 adc input stand - by c urrent vin = 48 v, converter disabled 3 madc input no load current (0 load on the output) vin = 48 v, converter enabled 90 madc input reflected - ripple current 25 mhz bandwidth 14 ma pk - pk input voltage ripple rejection 120 hz 75 db
qme48t40050 3 asia - pacific +86 755 298 85888 europe, middle east +353 61 225 977 north america +1 408 785 5200 ? 201 8 bel power solutions & protection bcd.00626 _a c output cha racteristics output voltage set point (no load) 4.950 5.000 5.050 vdc output regulation over line 2 5 mv over load 2 5 mv output voltage range over line, load and temperature 2 4.925 5.075 vdc output ripple and noise C 25 mhz bandwidth f ull load + 10 f tantalum + 1 f ceramic 60 120 mv pk - pk external load capacitance plus full load (resistive) 10,000 f output current range 0 40 adc current limit inception non - latching 42 47 52 adc peak short - circuit current for non - latching opti on, short = 10 m 50 a rms short - circuit current for non - latching option 9 arms dynamic response load change 50% - 75% - 50%, di/dt = 0.1 a/s co = 1 f ceramic 40 mv di/dt = 5 a/s co = 470 f pos + 1 f ceramic 140 mv settling time to 1% 15 s efficiency 100% load 92 % 50% load 93 % 1 vout can be increased up to 10% via the sense leads or up to 10% via the trim function. however, the total output voltage tri m from all sources should not exceed 10% of vout (nom), in order to ensu re specified operation of overvoltage protection circuitry. 2 operating ambient temperature range of - 40 oc to 85 oc for converter. these power converters have been designed to be stable with no external capa citors when used in low inductance input and output circuits. in many applications, the inductance associated with the distribution from the power source to the input of the converter can affect the stability of the converter. the addition of a 33 f elect rolytic capacitor with an esr < 1 ? across the input helps to ensure stability of the converter. in many applications, the user has to use decoupling capacitance at the load. the power converter will exhibit stable operation with external load capacitance up to 10,000 f on 5 v output. additionally, see the emc section of this data sheet for discussion of other external components which may be required for control of conducted emissions. the on/off pin is used to turn the power converter on or off remotely via a system signal. there are two remote control options available, positive and negative logic with both referenced to vin ( - ). a typical connection is shown in fig. a.
4 q me48t400 5 0 tech.support@ psbel.com figure a . circuit configuratio n for on/off function. the positive logic version turns on when the on/off pin is at a logic high and turns off when at a logic low. the converter i s on when the on/off pin is left open. see the electrical specifications for logic high/low definitions. t he negative logic version turns on when the pin is at a logic low and turns off when the pin is at a logic high. the on/off p in can be hardwired directly to vin ( - ) to enable automatic power up of the converter without the need of an external control signa l. the on/off pin is internally pulled up to 5 v through a resistor. a properly debounced mechanical switch, open collector transistor, or fet can be used to drive the input of the on/off pin. the device must be capable of sinking up to 0.2 ma at a low lev el voltage of ? 0.8 v. an external voltage source (20 v maximum) may be connected directly to the on/off input, in which case it must be capable of sourcing or sinking up to 1 ma depending on the signal polarity. see the startup information section for sy stem timing waveforms associated with use of the on/off pin. the remote sense feature of the converter compensates for voltage drops occurring between the output pins of the converter and the load. the sense ( - ) (pin 5) and sense (+) (pin 7) pins should be connected at the load or at the point where regulation is required (see fig. b). figure b . remote sense circuit configuration. caution if remote sensing is not utilized, the sense( - ) pin must be connected to the vout( - ) pin (pin 4), and the sense(+) pin must be connected to the vout(+) pin (pin 8) to ensure the converter will regulate at the specified output voltage. if these connections are not made, the converter will deliver an output voltage that is slightly higher than the specified data sheet value. because the sense leads carry minimal current, large traces on the end - user board are not required. however, sense traces should be run side by side and located close to a ground plane to minimize system noise and ensure optimum performance. the converters output overvoltage protection (ovp) senses the voltage across vout(+) and vout( - ), and not across the sense lines, so the resistance (and resulting voltage drop) between the output pins of the converter and the load should be minimized to prevent unwanted triggering of the ovp. when utilizing the remote sense feature, care must be taken not to exceed the maximum allowable output power capability of the converter, which is equal to the pr oduct of the nominal output voltage and the allowable output current for the given conditions. when using remote sense, the output voltage at the converter can be increased by as much as 10% above the nominal rating in order to maintain the required voltag e across the load. therefore, the designer must, if necessary, decrease the maximum current (originally obtained from the derating curves) by the same percentage to ensure the converters actual output power remains at or below the maximum allowable output power. rload vin control input vin (+) vin ( - ) on / off vout (+) vout ( - ) trim sense (+) sense ( - ) ( top view ) converter qme series 100 10 rw rw rload vin vin (+) vin ( - ) on / off vout (+) vout (+) trim sense (+) sense ( - ) ( top view ) converter qme series
qme48t40050 5 asia - pacific +86 755 298 85888 europe, middle east +353 61 225 977 north america +1 408 785 5200 ? 201 8 bel power solutions & protection bcd.00626 _a c the output voltage can be adjusted up 10% or down 20% relative to the rated output voltage by the addition of an externally connected resistor. the trim pin should be left open if trimming is not being used. to minimize noise pickup, a 0.1 f capacitor is connected internally between the trim and sense( - ) pins. to increase the output voltage, refer to fig. c. a trim resistor, r t - incr , should be connected between the trim (pin 6) and sense(+) (pin 7), with a v alue of: [k ? ], where, required value of trim - up resistor [ k ? ] nominal value of output voltage [v] [%] desired (tri mmed) output voltage [v]. when trimming up, care must be taken not to exceed the converters maximum allowable output power. see the previous section for a complete discussion of this requirement. figure c . configuration fo r increasing output voltage. to decrease the output voltage (fig. d), a trim resistor, r t - decr , should be connected between the trim (pin 6) and sense( - ) (pin 5), with a value of: [k ? ] where, required value of trim - down resistor [k ? ] and is defined above. note: the above equations for calculation of trim resistor values match those typically used in conventional industry - standard quarter - bricks. figure d . configuration for decreasing output voltage. 10.22 1.225 626 )v 5.11(100 r nom o incr t ? ? ? ? ? ? ? ? incr t r ? ? nom o v 100 x v ) v (v nom - o nom - o req - o ? ? ? ? req o v 10.22 | | 511 r decr t ? ? ? ? ? decr t r rload vin vin (+) vin ( - ) on / off vout (+) vout ( - ) trim sense (+) sense ( - ) r t - incr ( top view ) converter qme series rload vin vin (+) vin ( - ) on / off vout (+) vout ( - ) trim sense (+) sense ( - ) r t - decr ( top view ) converter qme series
6 q me48t400 5 0 tech.support@ psbel.com trimming/sensing beyond 110% of the rated output voltage is not an acceptable design practice, as this condition could cause unwanted triggering of the output overvoltage protection (ovp) circuit. the desig ner should ensure that the difference between the voltages across the converters output pins and its sense pins does not exceed 10% of v out (nom), or: [v] this equation is applicable for any condition of output sensing and/or output t rim. input undervoltage lockout is standard with this converter. the converter will shut down when the input voltage drops below a pre - determined voltage. the input voltage must be typically 34 v for the converter to turn on. once the converter has been turned on, it will shut off when the input voltage drops typically below 32 v. this feature is beneficial in preventing deep discharging of batteries use d in telecom applications. the converter is protected against overcurrent or short circuit conditions. upon sensing an overcurrent condition, the converter will switch to constant current operation and thereby begin to reduce output voltage. when the output voltage drops below 60% of the nominal value of output voltage, the converter will shut down. once the converter has shut down, it will attempt to restart nominally every 200 ms with a typical 3 - 5% duty cycle. the attempted restart will continue indefinitely until the overload or short circuit conditions are removed or the output voltage rises above 60% of its nominal value. once the output current is brought back into its specified range, the converter automatically exits the hiccup mode and continues normal opera tion. for implementations where latching is required, a latching option (l) is available for short circuit and ovp protections. converters with the latching feature will latch off if either event occurs. the converter will attempt to restart after eithe r the input voltage is removed and reapplied or the on/off pin is cycled. the converter will shut down if the output voltage across vout(+) (pin 8) and vout( - ) (pin 4) exceeds the threshold of the ovp circuitry. the o vp circuitry contains its own reference, independent of the output voltage regulation loop. once the converter has shut down, it will attempt to restart every 200 ms until the ovp condition is removed. for implementations where latching is required, a lat ching option (l) is available for short circuit and ovp protections. converters with the latching feature will latch off if either event occurs. the converter will attempt to restart after either the input voltage is removed and reapplied or the on/off p in is cycled. the converter will shut down under an overtemperature condition to protect itself from overheating caused by operation outside the thermal derating curves, or operation in abnormal conditions such as syste m fan failure. after the converter has cooled to a safe operating temperature, it will automatically restart for non - latching option. approved to the latest edition of the following safety standards: ul/csa 60950 - 1, en60950 - 1 and ie c60950 - 1. basic insulation is provided between input and output. to comply with safety agencies requirements, an input line fuse must be used external to the converter. a 10 a fuse is recommended for use with this product. all qme converters are ul appro ved for a maximum fuse rating of 15 amps. to protect a group of converters with a single fuse, the rating can be increased from the recommended value above. x nom - o sense sense out out 10% v )] ( v ) ( [v )] ( v ) ( [v ? ? ? ? ? ? ? ?
qme48t40050 7 asia - pacific +86 755 298 85888 europe, middle east +353 61 225 977 north america +1 408 785 5200 ? 201 8 bel power solutions & protection bcd.00626 _a c emc requirements must be met at the end - product system leve l, as no specific standards dedicated to emc characteristics of board mounted component dc - dc converters exist. however, bel power solutions tests its converters to several system level standards, primary of which is the more stringent en55022, information technology equipment - radio disturbance characteristics - limits and methods of measurement. an effective internal lc differential filter significantly reduces input reflected ripple current, and improves emc. with the addition of a simple external filter, all versions of the qme - series of converters pass the requirements of class b conducted emissions per en55022 and fcc requirements. please contact bel power solutions applications engineering for details of this testing. the converter has been characterized for many operational aspects, to include thermal derating (maximum load current as a function of ambient temperature and airflow) for vertical and horizontal mountings, efficiency, startup and shutdown paramete rs, output ripple and noise, transient response to load step - change, overload, and short circuit. the following pages contain specific plots or waveforms associated with the converter. additional comments for specific data are provided below. all data presented were taken with the converter soldered to a test board, specifically a 0.060 thick printed wiring board (pwb) with four layers. the top and bottom layers were not metalized. the two inner layers, comprised of two - ounce copper, we re used to provide traces for connectivity to the converter. the lack of metalization on the outer layers as well as the limited thermal connection ensured that heat transfer from the converter to the pwb was minimized. this provides a worst - case but consi stent scenario for thermal derating purposes. all measurements requiring airflow were made in the vertical and horizontal wind tunnel using infrared (ir) thermography and thermocouples for thermometry. ensuring components on the converter do not exceed the ir ratings is important to maintaining high reliability. if one anticipates operating the converter at or close to the maximum loads specified in the derating curves, it is prudent to check actual operating temperatures in the application. thermographic im aging is preferable; if this capability is not available, then thermocouples may be used. the use of awg #40 gauge thermocouples is recommended to ensure measurement accuracy. careful routing of the thermocouple leads will further minimize measurement erro r. refer to fig. h for the optimum measuring thermocouple location. fig. e : location of the thermocouple for thermal testing.
8 q me48t400 5 0 tech.support@ psbel.com load current vs. ambient temperature and airflow rates are given in fig. 1 and fig. 2 for vertical and horizontal converter mountings. ambient temperature was varied between 25c and 85c, with airflow rates from 30 to 500 lfm (0.15 to 2.5 m/s). for each set of conditions, the maximum load current was defined as the lowest of: (i) the output current at which any fet junction temperature does not exceed a maximum s pecified temperature of 120 c as indicated by the thermographic image, or (ii) the temper ature of the inductor does not exceed 120 c, or (iii) the nominal rating o f the converter (40 a). during normal operation, derating curves with maximum fet temperature less or equal to 120 c should not be exceeded. temperature at the thermocouple location shown in fig. h should not exceed 120 c in order to operate inside the d erating curves. fig. 3 shows the efficiency vs. load current plot for ambient temperature of 25 oc, airflow rate of 300 lfm (1.5 m/s) with vertical mounting and input voltages of 36 v, 48 v, and 72 v. also, a plot of efficiency vs. load curr ent, as a function of ambient temperature with vin = 48 v, airflow rate of 200 lfm (1 m/s) with vertical mounting is shown in fig. 4. fig. 5 shows the power dissipation vs. load current plot for ta = 25 oc, airflow rate of 300 lfm (1. 5 m/s) with vertical mounting and input voltages of 36 v, 48 v, and 72 v. also, a plot of power dissipation vs. load current, as a function of ambient temperature with vin = 48 v, airflow rate of 200 lfm (1 m/s) with vertical mounting is shown in fig. 6. output voltage waveforms, during the turn - on transient using the on/off pin for full rated load currents (resistive load) are shown without and with external load capacitance in error! reference source not found. and figure 7 , respectively. fig. 10 show the output voltage ripple waveform, measured at full rated load current with a 10 f tantalum and 1 f ceramic capacitor across the output. note that all output voltage waveforms are m easured across a 1 f ceramic capacitor. the input reflected ripple current waveforms are obtained using the test setup shown in fig 11. the corresponding waveforms are shown in figs. 12 - 13.
qme48t40050 9 asia - pacific +86 755 298 85888 europe, middle east +353 61 225 977 north america +1 408 785 5200 ? 201 8 bel power solutions & protection bcd.00626 _a c scenario #1 : i nitial start - up from bulk supply on/off function enabled, converter started via application of v in . see figure f . time comments t 0 on/off pin is on; system front end power is toggled on, v in to converter begins to rise. t 1 v in crosses under - voltage loc kout protection circuit threshold; converter enabled. t 2 converter begins to respond to turn - on command (converter turn - on delay). t 3 converter v out reaches 100% of nominal value. for this example, the total converter start - up time (t 3 - t 1 ) is typically 4 ms. figure f . startup scenario #1. scenario #2 : initial start - up using on/off pin with v in previously powered, converter started via on/off pin. see figure g . time comments t 0 v input at nominal value. t 1 arbitrary t ime when on/off pin is enabled (converter enabled). t 2 end of converter turn - on delay. t 3 converter v out reaches 100% of nominal value. for this example, the total converter start - up time (t 3 - t 1 ) is typically 4 ms. figure g . startup scenario #2. scenario #3 : turn - off and restart using on/off pin with v in previously powered, converter is disabled and then enab led via on/off pin. see figure h . time comments t 0 v in and v out are at nominal values; on/off pin on. t 1 on/o ff pin arbitrarily disabled; converter output falls to zero; turn - on inhibit delay period (2 00 ms typical) is initiated, and on/off pin action is internally inhibited. t 2 on/off pin is externally re - enabled. if (t 2 - t 1 ) 2 00 ms , external action of on/of f pin is locked out by start - up inhibit timer. if (t 2 - t 1 ) > 2 00 ms , on/off pin action is internally enabled. t 3 turn - on inhibit delay period ends. if on/off pin is on, converter begins turn - on; if off, converter awaits on/off pin on signal; see figure f. t 4 end of converter turn - on delay. t 5 converter v out reaches 100% of nominal value. for the condition, (t 2 - t 1 ) 2 00 ms , the total converter start - up time (t 5 - t 2 ) is typically 203 ms. for (t 2 - t 1 ) > 2 00 ms , start - up will be typically 4 ms after release of on/off pin. figure h . startup scenario #3. v in on/off state v out t t 0 t 1 t 2 t 3 on off on/off state v out t 0 t 1 t 2 t 3 on off v in t on/off state off on v out t 0 t 2 t 1 t 5 v in t t 4 t 3 100 ms
10 q me48t400 5 0 tech.support@ psbel.com fig. 1: available load current vs. ambient air temperature and airflow rates for converter with g height pins mounted vertically with air flowing from pin 1 to pin 3, mosfet temperature ? 120 ? c, vin = 48 v note: nc C natural convection fig. 2: available load current vs. ambient air temperature and airflow rates for converter with g height pins mounted horizontally with air flowing from pin 1 to pin 3, mosfet temperature ? 120 ? c, vin = 48 v fig. 3: efficiency vs. load current and input voltage for converter mounted vertically with air flowing from pin 1 to pin 3 at a rate of 300 lfm (1.5 m/s) and ta = 25 ? c. fig. 4: efficiency vs. load cu rrent and ambient temperature for converter mounted vertically with vin = 48 v and air flowing from pin 1 to pin 3 at a rate of 200 lfm (1.0 m/s) fig. 5: power dissipation vs. load current and input voltage for converter mounted vertically with air flowing from pin 1 to pin 3 at a rate of 300 lfm (1.5 m/s) and ta = 25 ? c fig. 6: power dissipation vs. load current and ambient temperature for converter mounted vertically with vin = 4 8 v and air flowing from pin 1 to pin 3 at a rate of 200 lfm (1.0 m/s) ambient temperature [c] 20 30 40 50 60 70 80 90 load current [adc] 0 10 20 30 40 50 500 lfm (2.5 m/s) 400 lfm (2.0 m/s) 300 lfm (1.5 m/s) 200 lfm (1.0 m/s) 100 lfm (0.5 m/s) nc - 30 lfm (0.15 m/s) ambient temperature [c] 20 30 40 50 60 70 80 90 load current [adc] 0 10 20 30 40 50 500 lfm (2.5 m/s) 400 lfm (2.0 m/s) 300 lfm (1.5 m/s) 200 lfm (1.0 m/s) 100 lfm (0.5 m/s) nc - 30 lfm (0.15 m/s) load current [adc] 0 8 16 24 32 40 48 efficiency 0.75 0.80 0.85 0.90 0.95 1.00 72 v 48 v 36 v load current [adc] 0 8 16 24 32 40 48 efficiency 0.75 0.80 0.85 0.90 0.95 1.00 70 c 55 c 40 c load current [adc] 0 8 16 24 32 40 48 power dissipation [w] 0.00 5.00 10.00 15.00 20.00 25.00 72 v 48 v 36 v load current [adc] 0 8 16 24 32 40 48 power dissipation [w] 0.00 5.00 10.00 15.00 20.00 25.00 70 c 55 c 40 c
qme48t40050 11 asia - pacific +86 755 298 85888 europe, middle east +353 61 225 977 north america +1 408 785 5200 ? 201 8 bel power solutions & protection bcd.00626 _a c fig. 7: turn - on transient at full rated load current (resistive) with no output capacitor at vin = 48 v, triggered via on/off pin. top trace on/off signal (5 v/div.). bottom tra ce: output voltage (2 v/div.) time scale: 2 ms/div. fig. 8: turn - on transient at full rated load current (resistive) plus 10,000 f at vin = 48 v, triggered via on/off pin. top trace: on/off signal (5 v/div.). bottom trace: output voltage (5 v/div.)time sc ale: 2 ms/div fig. 9: output voltage response to load current step - change (20 a 30 a C 20 a) at vin = 48 v. top trace: output voltage (100 mv/div.). bottom trace: load current (10 a/div.). current slew rate: 0.1 a/s co = 1 f ceramic. time scale: 0. 2 ms/div fig. 10: output voltage response to load current step - change (20 a C 30 a C 20 a) at vin = 48 v. top trace: output voltage (100 mv/div.).bottom trace: load current (10 a/div.). current slew rate: 5 a/s. co =470 f pos + 1 f ceramic. time scale: 0 .2 ms/div. fig. 11: output voltage ripple (20 mv/div.) at full rated load current into a resistive load with co = 10 f tantalum + 1 f ceramic and vin = 48 v. time scale: 1 s/div. fig. 12: test setup for measuring input reflected ripple currents, ic and is. vout v source i s i c 1 ? ceramic capacitor 10 ? source inductance dc / dc converter 33 ? esr < 1 electrolytic capacitor ? qme series
12 q me48t400 5 0 tech.support@ psbel.com fig. 13: input reflected ripple current, ic (500 ma/div.), measured at input terminals at full rated load current and vin = 48 v. refer to fig. 12 for test setup. time scale: 1 s/div fig. 14: input reflected ripple current, is (10 ma/d iv.), measured through 10 h at the source at full rated load current and vin = 48 v. refer to fig. 12 for test setup. time scale: 1 s/div fig. 15: output voltage vs. load current showing current limit point and converter shutdown point. input volt age has almost no effect on current limit characteristic fig. 16: load current (top trace, 20 a/div., 50 ms/div.) into a 10 m short circuit during restart, at vin = 48 v. bottom trace (20 a/div., 2ms/div.) is an expansion of the on - time portion of the to p trace fig 17: conformal coating will be applied over ic100 for sqe48t40050 ngalg to pass telcordia gr - 63 - core mixed flow gas test fig 18: actual picture of ic100 with conformal coating 10 30 40 60 iout [ adc ] v o u t [ v d c ] 0 0 20 50 6 . 0 4 . 5 3 . 0 1 . 5
qme48t40050 13 asia - pacific +86 755 298 85888 europe, middle east +353 61 225 977 north america +1 408 785 5200 ? 201 8 bel power solutions & protection bcd.00626 _a c q m e48t platform no tes ? all dimensions are in inches [mm] ? pins 1 - 3 and 5 - 7 are ? 0.040 [1.02] with ? 0.078 [1.98] shoulder ? pins 4 and 8 are ? 0.062 [1.57] without shoulder ? pin material & finish: brass alloy 360 with matte tin over nickel ? converter weight: 1.22 oz [34.98 g] pad/pin connections pad/pin # function 1 vin (+) 2 on/off 3 vin ( - ) 4 vout ( - ) 5 sense( - ) 6 trim 7 sense(+) 8 vout (+) tolerance unless otherwise noted linear: x.x = +/ - .020 [0.5] x.xx = +/ - 0.010 [0.25] x.xxx = +/ - 0.005 [0.13] angular x = +/ - 2 .x = +/ - .25 pin option pl pin length 0.005 [0.13] a 0.188 [4.7 8 ] b 0.145 [3.68] height option ht (max. height) cl (min. clearance) +0.000 [+0.00] - 0.044 [ - 1.12] +0.016 [+0.41] - 0.000 [ - 0.00] g 0.425 [10.80] 0.035 [0.89] side view top view 1 2 3 7 8 6 5 4
14 q me48t400 5 0 tech.support@ psbel.com product series input voltage mounting scheme rated load current output voltage on/off logic maximum height [ht] pin length [pl] special features environmental qme 48 t 40 050 - n g b 0 quarter - brick format 36 - 75 v t ? through - ho le 40 a 050 ? 5.0 v n ? negative p ? positive through hole g ? 0.445 through hole a ? 0.188 b ? 0.145 0 ? std b ? baseplate option l ? latching option no suffix ? rohs lead - solder - exempt compliant g ? rohs compliant for all six substan ces the example above describes p/n qme48t40050 - ngb0: 36 - 75 v input, through - hole mounting, 40 a @ 5.0 v output, negative on/off logic, a maximum height of 0.445, a through the board pin length of 0.145, standard (non - latching), and eutectic tin/lead so lder. please consult factory for the complete list of available options. nuclear and medical applications - products are not designed or intended for use as critical components in life support systems, equipment used in hazardous environments, or nuclear control systems. technical revisions - the appearance of products, including safety agency c ertifications pictured on labels, may change depending on the date manufactured. specifications are su bject to change without notice.

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