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the allegro ? ACS726 current sensor ic family provides economical and precise solutions for ac current sensing in industrial, commercial, and communications systems. the device package allows for easy implementation by the customer. typical applications include motor control, load detection and management, switched-mode power supplies, and overcurrent fault protection. the fully differential output gives superior immunity to output offset drift as well common mode noise. ACS726 is the first current sensor ic to include a fully differential back-end amplifier (bea) that can be used to adjust gain and bandwidth via external rc networks. the bea is fully independent and when unused, it can be powered down to reduce power consumption. the device consists of a precise, low-offset, linear hall sensor circuit with a copper conduction path located near the surface of the die. applied current flowing through this copper conduction path generates a magnetic field which is sensed by the integrated hall ic and converted into a proportional voltage. device accuracy is optimized through the close proximity of the magnetic field to the hall transducer. a ACS726-ds, rev. 1 ? fully differential architecture for improved immunity to offset drift and common mode noise ? spare differential back end amplifier for externally adjustable gain and bandwidth using simple rc networks ? greatly improved bandwidth through proprietary amplifier and filter design techniques ? high bandwidth 120 khz analog output ? patented integrated digital temperature compensation circuitry allows nearly closed-loop accuracy, through entire temperature range, in an open loop sensor ? 1.1?m?primary?conductor?resistance?for?low?power?loss? and high inrush current withstanding capability ? small footprint, low-profile qsop24 package suitable for space-constrained applications ? integrated shield virtually eliminates capacitive coupling from current conductor to die due to high dv/dt voltage transients galvanically isolated current sensor ic with differential output and externally adjustable gain package: 24-pin qsop (suffix lf) typical application approximate scale ACS726 continued on the next page continued on the next page 3.3 v r in1 r fb1 r in2 r fb2 c bypass 0.1 f ip+ ip+ ip+ ip+ ip+ ip+ ip? ip? ip? ip? ip? ip? nc nc vcc voutgp voutgn vingn vingp voutp voutn gnd nc nc 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 ACS726 i p current sensor ic gain can be set using r fb and r in features and benefits description
2 precise, proportional voltage is provided by the low-offset, chopper- stabilized bicmos hall ic, which is programmed for accuracy after packaging. the output of the device has a positive differential voltage ( v outp C v outn ) when an increasing current flows through the primary copper conduction path (from pins 1 through 6, to pins 7 through 12), which is the path used for current sensing. the internal resistance? of? this? conductive? path? is? 1.1? m? typical,? providing? low? power loss. the terminals of the conductive path are electrically isolated from the sensor ic signal leads (pins 13 through 24). this allows the ACS726 current sensor ic to be used in high-side current sense applications without the use of high-side differential amplifiers or other costly isolation techniques. the ACS726 is provided in a small, low-profile surface mount qsop24 package (suffix lf). the leadframe is plated with 100% matte tin, which is compatible with standard lead (pb) free printed circuit board assembly processes. internally, the device is pb-free, except for flip-chip high-temperature pb-based solder balls, currently exempt from rohs. the device, excluding the bae, is fully calibrated prior to shipment from the factory. ? 3 to 3.6 v, single supply operation ? factory-trimmed sensitivity and quiescent output voltage for improved accuracy ? chopper stabilization results in extremely stable quiescent output voltage ? ratiometric output from supply voltage features and benefits (continued) description (continued) selection guide part number optimized range for sensed current, i p (a) linear range for sensed current, i p (a) sensitivity, sens (typ) (mv/a) 1 operating ambient tempera - ture range t a , (c) packing 2 ACS726llftr-20b-t 3 20 20 100 C40 to 150 tape and reel, 2500 pieces per 13-in. reel ACS726llftr-40b-t 3 40 40 50 1 measured differently when v cc = 3.3 v and using a 2000 mv dynamic range. 2 c ontact allegro ? for additional packing options. 3 variant not intended for automotive applications. galvanically isolated current sensor ic with differential output and externally adjustable gain ACS726 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
3 absolute maximum ratings characteristic symbol notes rating unit supply voltage v cc vcc pin 6 v reverse supply voltage v rcc vcc pin C0.1 v output voltage v outp , v outn voutp and voutn pins 6 v reverse output voltage v routp, v routn voutp and voutn pins C0.1 v bea input voltage v ingp, v ingin vingp and vingin pins 6 v bea reverse input voltage v ringp , v ringn vingp and vingn pins C0.1 v bea output voltage v outgp , v outgn voutgp and voutgn pins 6 v bea reverse output voltage v routgp , v routgn voutgp and voutgn pins C0.1 v output source current i out(source) voutp, voutn, voutgp, voutgn pins to gnd 3 ma output sink current i out(sink) vcc pin to voutp, voutn, voutgp, voutgn 10 ma electric strength test voltage v estv between pins 1-12 and 13-24; 60 hz, 1 minute (agency type test), t a = 25c 2100 vac working voltage v working for single protection according to ul 1577 standard; for higher continuous voltage ratings, please contact allegro 277 vac 391 v pk or vdc operating ambient temperature t a range l C40 to 150 oc maximum junction temperature t j (max) 165 oc storage temperature t stg C65 to 170 oc thermal characteristics may require derating at maximum conditions, see application information characteristic symbol test conditions* value unit package thermal resistance (junction to ambient) r ja on allegro ACS726 evaluation board (expected value) 27 oc/w *additional thermal information available on the allegro website. galvanically isolated current sensor ic with differential output and externally adjustable gain ACS726 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
4 functional block diagram vcc voutgp voutgn voutn voutp gnd dynamic of fset cancellation ip+ ip+ ip? ip? signal recovery sensitivity control temperature sensor eeprom and control logic offset control hall current drive vingp vingn back end amplifier (bea) stage 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 nc nc vcc voutgp voutgn vingn vingp voutp voutn gnd nc nc ip+ ip+ ip+ ip+ ip+ ip+ ip? ip? ip? ip? ip? ip? package lf, 24-pin qsop pin-out diagram terminal list table number name function 1 through 6 ip+ terminals for current being sensed; fused internally 7 through 12 ipC terminals for current being sensed; fused internally 15 gnd signal ground terminal 16 voutn negative analog output 17 voutp positive analog output 18 vingp gain stage positive analog input 19 vingn gain stage negative analog input 20 voutgn gain stage negative analog output 21 voutgp gain stage positive analog output 22 vcc device power supply terminal 13,14,23,24 nc no connection; connect to gnd for optimal esd performance pin-out diagram and terminal list table galvanically isolated current sensor ic with differential output and externally adjustable gain ACS726 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
5 characteristic symbol test conditions min. typ. max. unit supply voltage v cc 3 3.3 3.6 v supply output impedance v ccimp C C 5 supply current i cc v cc = 3.3 v, no output load, bea disabled 8 14 23 ma icc total v cc = 3.0 v to 3.6 v, bea enabled 12 22 40 ma output capacitive load c l voutp to gnd, voutn to gnd C C 4.7 nf output resistive load r l voutp to gnd, voutn to gnd 4.7 C C k primary conductor resistance r primary t a = 25c C 1.1 C m rise time 1 t r i p = i p(max) ; t a = 25c, c l = 1 nf C 3.7 C s propagation delay 1 t pd i p = i p(max) ; t a = 25c, c l = 1 nf C 2.5 C s response time 1 t response i p = i p(max) ; t a = 25c, c l = 1 nf, 90% input to 90% v ioutdiff C 5 C s internal bandwidth 1 bw i small signal C3 db; t a = 25c, c l = 1 nf C 120 C khz linearity error 1 err lin across full range of i p -1 < 0.5 1 % saturation voltage v sat(h) t a = 25c, r l = 4.7 k to gnd v cc C 0.3 C C v v sat(l) t a = 25c, r l = 4.7 k to vcc C C 0.3 v power-on time 1 t po t a = 25c, i p = i p (max) C 85 C s differential quiescent output voltage v ioutdiff(q) i p = 0 C 0 C v common mode output voltage 1 v cmo i p = 0, no load, v cc = 3.3 v, t a = 25c to 150c 1.4 1.65 1.9 v common mode offset voltage v cmoe i p = 0, no load, v cc = 3.3 v, t a = 25c to 150c -250 20 250 mv common mode output voltage ratiometry 1 ?v cmorat t a = 25c, v cc = 3.3 v +/-10% C 100 C % sensitivity ratiometry 1 ?sens rat t a = 25c, v cc = 3.3 v +/-10% C 100 C % 1 see characteristic defnitions section. common operating characteristics : not including bea, t a = C40c to 150c, v cc = 3.3 v, c bypass = 0.1 f; unless otherwise specifed galvanically isolated current sensor ic with differential output and externally adjustable gain ACS726 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
6 characteristic symbol test conditions min. typ. max. unit current sensing range i p C20 C 20 a differential sensitivity 1 sens diff across full range of i p , t a = 25c 98 100 102 mv/a across full range of i p , t a = C40c to 25c, not cold trimmed C 100 C mv/a across full range of i p , t a = 25c to 150c 97 100 103 mv/a sensitivity drift over lifetime 2 ?sens life t a = -40c to 150c, shift after qualification testing C 1 C % noise v noise(rms) bw i = 120 khz, t a = 25c, c l = 1 nf to gnd C 10.5 C mv rms input-referenced noise density i nd(rms) bw i 120 khz, t a = 25c, c l = 1 nf to gnd C 305 C a / hz zero current output voltage v outp(q) , v outn(q) i p = 0 a, t a = 25c, v cc = 3.3 v 1.4 1.65 1.9 v differential offset voltage 3 v oe t a = 25c -15 5 15 mv t a = C40c to 25c, not cold trimmed C 10 C mv t a = 25c to 150c -15 5 15 mv offset voltage drift over lifetime 2 ?v oelife t a = -40c to 150c, shift after qualification testing C 2 C mv total output error 4,5 err tot i p = 20 a, t a = 25c, bw i = 120 khz -3 1 3 % i p = 20 a, t a = C40c to 25c, bw i = 120 khz, not cold trimmed C 2 C % i p = 20 a, t a = 25c to 150c, bw i = 120 khz -3 1 3 % total output error drift over lifetime 2 ?err totlife t a = -40c to 150c, shift after qualification testing C 1 C % 1 this parameter may drift a maximum of ?sens life over lifetime. 2 based on characterization data obtained during standardized stress test for qualifcation of integrated circuits. cannot be guaranteed. drift is a function of customer application conditions. please contact allegro microsystems for further information. 3 this parameter may drift a maximum of ?v oelife over lifetime. 4 this parameter may drift a maximum of ?err totlife over lifetime. 5 measured as a percentage of a 2000 mv dynamic range. ACS726-20b operating characteristics : not including bea, t a = C40c to 150c, v cc = 3.3 v, c bypass = 0.1 f; unless otherwise specifed galvanically isolated current sensor ic with differential output and externally adjustable gain ACS726 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
7 characteristic symbol test conditions min. typ. max. unit current sensing range i p C40 C 40 a differential sensitivity 1 sens diff across full range of i p , t a = 25c 49 50 51 mv/a across full range of i p , t a = C40c to 25c, not cold trimmed C 50 C mv/a across full range of i p , t a = 25c to 150c 48.5 50 51.5 mv/a sensitivity drift over lifetime 2 ?sens life t a = -40c to 150c, shift after qualification testing C 1 C % noise v noise(rms) bw i = 120 khz, t a = 25c, c l = 1 nf to gnd C 5.25 C mv rms input-referenced noise density i nd(rms) bw i 120 khz, t a = 25c, c l = 1 nf to gnd C 305 C a / hz zero current output voltage v outp(q) , v outn(q) i p = 0 a, t a = 25c, v cc = 3.3v 1.40 1.65 1.9 v differential offset voltage 3 v oe t a = 25c -15 3 15 mv t a = C40c to 25c, not cold trimmed C 8 C mv t a = 25c to 150c -15 3 15 mv offset voltage drift over lifetime 2 ?v oelife t a = -40c to 150c, shift after qualification testing C 2 C mv total output error 4,5 err tot i p = 40 a, t a = 25c, bw i = 120 khz -2.5 1 2.5 % i p = 40 a, t a = C40c to 25c, bw i = 120 khz, not cold trimmed C 2 C % i p = 40 a, t a = 25c to 150c, bw i = 120 khz -2.5 1 2.5 % total output error drift over lifetime 2 ?err totlife t a = -40c to 150c, shift after qualification testing C 1 C % 1 this parameter may drift a maximum of ?sens life over lifetime. 2 based on characterization data obtained during standardized stress test for qualifcation of integrated circuits. cannot be guaranteed. drift is a function of customer application conditions. please contact allegro microsystems for further information. 3 this parameter may drift a maximum of ?v oelife over lifetime. 4 this parameter may drift a maximum of ?err totlife over lifetime. 5 measured as a percentage of a 2000 mv dynamic range. ACS726-40b operating characteristics : not including bea, t a = C40c to 150c, v cc = 3.3 v, c bypass = 0.1 f; unless otherwise specifed galvanically isolated current sensor ic with differential output and externally adjustable gain ACS726 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
8 characteristic symbol test conditions min. typ. max. unit load output capacitive load c l(bea) voutgp to gnd, voutgn to gnd C C 4.7 nf output resistive load r l(bea) voutgp to gnd, voutgn to gnd 4.7 C C k gain setting resistance feedback resistor 1 r fb(bea) 9.4 C 50 k input resistor 1 r in(bea) 4.7 C 25 k ac performance open loop gain g ol(bea) C 90 C db closed loop gain 2 g cl(bea) 2 C 10 C bandwidth bw (bea) g cl(bea) = 2, c l(bea) = 1 nf C 1000 C khz gain bandwidth product gbwp (bea) c l(bea) = 1 nf C 2000 C khz differential slew rate sr d(bea) g cl(bea) = 2, c l(bea) = 1 nf C 1.5 C v/s settling time to 1% t s(bea) g cl(bea) = 2, c l(bea) = 1 nf, v outgp C v outgn = 100 mv C 3 C s input-referred voltage noise density v nd(bea) t a = 25c, bw (bea) < 120 khz, g cl(bea) = 2 C 40 C nv/ hz dc performance input-referred differential offset voltage v oeir(bea) at t a = 25c -7 3 7 mv at t a = 25c to 150c -7 3 7 mv quiescent operating current 3 i q(bea) g cl(bea) = 2, c l(bea) = 1 nf 3.5 7 17 ma power supply rejection ratio psrr (bea) g cl(bea) = 2, c l(bea) = 1 nf, bw (bea) < 1 khz C -70 C db input minimum common mode input range v cmirmin (bea) v cc = 3.3 v, g cl(bea) = 2, rin (bea) = 4.7 k, rfb (bea) = 9.4 k 1 C C v v cmirmax (bea) v cc = 3.3 v, g cl(bea) = 2, rin (bea) = 4.7 k, rfb (bea) = 9.4 k C C 2.15 v common mode rejection ratio cmrr (bea) g cl(bea) = 2, c l(bea) = 1 nf, bw (bea) < 1 khz C 60 C db input bias current i bias(bea) v cc = 3.3 v, vingp = vingn = 1.65 v -1.5 <1 1.5 a output saturation voltage v sat(h)(bea) t a = 25c, r l(bea) = 4.7 k to gnd v cc C 0.3 C C v v sat(l)(bea) t a = 25c, r l(bea) = 4.7 k to vcc C C 0.3 v common mode output voltage v cmo(bea) v cc = 3.3 v, g cl = 2, t a = 25c to 150c 1.4 1.65 1.9 v common mode offset voltage v cmoe(bea) v cc = 3.3 v, g cl = 2, t a = 25c to 150c -250 20 250 mv dc output resistance r out(bea) C <1 C linearity err lin(bea) g cl(bea) = 2, over 2 v differential dynamic range C <0.1 C % 1 if larger resistor values are used, settling time deteriorates. adding a capacitor in parallel with the feedback resistor improves settling time. 2 allegro does not guarantee bae performance and stability for closed loop gain outside the recommended range. 3 the back end amplifer can be powered-down by connecting vingp and vingn to gnd, causing voutgp and voutgn to be = vcc/2 differential back end amplifer (bea) operating characteristics 1: t a = C40c to 150c, v cc = 3.3 v, c bypass = 0.1 f; unless otherwise specifed galvanically isolated current sensor ic with differential output and externally adjustable gain ACS726 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
9 characteristic performance data data taken using the ACS726llftr-20b-t timing data ip=20a voutp voutn voutp - voutn t response =4.3s 9 0% of input 9 0% of output response time (90%input-90%output) ip=20 a, 10% to 90% ip rise time < 1 s, c bypass = 0.1 f, c l =1 nf from voutp to gnd and voutn to gnd ip=20a voutp voutn voutp - voutn t r =3.5s 10% of output 9 0% of output rise time (10%output-90%output) ip=20 a, 10% to 90% ip rise time < 1 s, c bypass = 0.1 f, c l = 1 nf from voutp to gnd and voutn to gnd galvanically isolated current sensor ic with differential output and externally adjustable gain ACS726 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
10 ip=20a voutp voutn voutp - voutn t pd =2.5s 2 0% of input 20% of output propagation delay(20%input-20%output) ip = 20 a, 10% to 90% ip rise time < 1 s, c bypass = 0.1 f, c l = 1 nf from voutp to gnd and voutn to gnd vcc voutp voutn voutp - voutn t po=83s vcc(min)=3v 90% of output power-on time ip = 20 a, 10% to 90% rise time < 1 s galvanically isolated current sensor ic with differential output and externally adjustable gain ACS726 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
11 accuracy characteristics differential sensitivity (sens diff ) the change in the differential sensor ic output (v outp C v outn ) in response to a 1 a change through the primary conductor. the sensitivity is the product of the magnetic circuit sensitivity (g / a) (1 g = 0.1 mt) and the linear ic amplifier gain (mv/g). the linear ic amplifier gain is programmed at the factory to optimize the sensitivity (mv/a) for the full-scale current of the device. noise (v noise(rms) ) the unfiltered output noise of the current sensor ic. dividing the noise (mv) by the sensitivity (mv/a) provides the smallest current that the device is able to resolve. linearity error (err lin )* the ACS726 is designed to provide a linear output in response to a ramping current. consider two current levels, i1 and i2. ideally, the sensitivity of a device is the same for both currents, for a given supply voltage and tempera - ture. nonlinearity is present when there is a difference between the sensitivities measured at i1 and i2. nonlinearity is calculated separately for the positive (err lin pos ) and negative (err linneg ) applied currents as follows: where: sens ix = (v ioutdiff(ix) C v ioutdiff(q) )/ ix and iposx and inegx are positive and negative currents. then: err lin = max( err linpos , err linneg ) differential quiescent output voltage ( v ioutdiff(q) )* the dif - ferential output of the sensor ic when the primary current is zero. it is nominally 0 v. differential offset voltage (v oe ) the deviation of the device output, from its ideal quiescent value of 0 v, due to nonmagnetic causes. to convert this voltage to amperes, divide by the device sensitivity, sens. common mode output voltage (v cmo ) the average of the positive and negative zero current output voltages: (v outp(q) + v outn(q) ) / 2. v cmo nominally equals v cc / 2. common mode offset voltage (v cmoe ) the deviation of the common mode output voltage from its ideal value of v cc / 2. total output error (etot)* the maximum deviation of the actual output from its ideal value, also referred to as accuracy, illustrated graphically in the output voltage versus sensed cur - rent chart . etot is divided into four areas: 0 a at 25c. accuracy at the zero current flow at 25c, without the effects of temperature. 0 a over temperature. accuracy at the zero current flow including temperature effects. full-scale current at 25c. accuracy at the full-scale current at 25c, without the effects of temperature. full-scale current over temperature. accuracy at the fullscale current flow including temperature effects. where v ioutdiff_ideal(ip) = v ioutdiff_ideal(q) + (sens diff_ideal x ip) the total output error incorporates all sources of error and is a function of i p . at relatively high currents, e tot will be mostly due to sensitivity error, and at relatively low currents, e tot will be mostly due to offset voltage (v oe ). in fact, at i p = 0, e tot approaches infinity due to the offset. this is illustrated in the total output error versus sensed current chart. ratiometry the ratiometric feature means that the common mode output voltage, v cmo , and differential sensitivity, sens diff , are proportional to the supply voltage, v cc . the following formula is used to derive the ratiometric change in common mode 0 a output voltage, v cmorat (%). 100 v cmo(vcc) / v cmo(3.3v) v cc / 3.3 v the ratiometric change in sensitivity, sens r at (%), is defined as: 100 sens diff ( vcc) /s ens diff ( 3.3v) v cc / 3.3 v characteristics definitions hqlwlrqvri9 iout : ? v ioutdiff = v outp C v outn ? v ioutdiff(q) = v outp(q) C v outn(q) ; sensed current equals 0 a err err linpos linneg = 100(%) x = 100(%) x sens sens ipos2 sens sens ipos1 ineg2 ineg1 1 - 1 - { { } } ( ( ) ) e tot(ip) = 100(%) x (v x ip ioutdiff(ip) ioutdiff_ideal(ip) sens diff_ideal - v ) [] galvanically isolated current sensor ic with differential output and externally adjustable gain ACS726 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
12 0a decreasing v (v) ioutdiff e at tot 25c only e at tot 25c only e at tot 25c only increasing v (v) ioutdiff e across tot full temperature e across tot full temperature e across tot full temperature average v iout -20 a (20 ab) -40 a (40 ab) 20 a (20 ab) 40 a (40 ab) +i (a) p ?i (a) p v iout(q) full scale output voltage versus sensed current total output error at 0 a and at full-scale current +i p ?i p +e tot ?e tot across temperature 25c only total output error versus sensed current galvanically isolated current sensor ic with differential output and externally adjustable gain ACS726 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
13 dynamic response characteristics power-on time (t po ). when the supply is ramped to its operat - ing voltage, the device requires a finite time to power its internal components before responding to an input magnetic field. power- on time, t po , is defined as the time it takes for the output volt - age to settle within 10% of its steady state value when full scale i p is applied, after the power supply has reached its minimum specified operating voltage, v cc (min), as shown in the chart at right. rise time (t r ) the time interval between a) when the sensor ic differential output reaches 10% of its full scale value, and b) when it reaches 90% of its full scale value. propagation delay (t pd ) the time interval between a) when the input current reaches 20% of its final value, and b) when the dif - ferential output reaches 20% of its final value. response time (t response ) the time interval between a) when the applied current reaches 90% of its final value, and b) when the sensor differential output reaches 90% of its final value corresponding to the applied current. primary current v rise time, t propagation delay, t 90 0 10 20 (%) t pd r ioutdiff v ioutdiff v t v cc v (min.) cc 90% v iout 0 t = time at which power supply reaches 1 minimum speci?ed operating voltage t = time at which output voltage settles 2 within 10% of its steady state value under an applied magnetic ?eld t 1 t 2 t po v (typ.) cc power-on time rise time and propagation delay primary current v ioutdiff response 90 0 (%) response time, t t response time galvanically isolated current sensor ic with differential output and externally adjustable gain ACS726 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
14 package lf, 24-pin qsop for reference only ? not for t ooling use (reference jedec mo-137 ae) dimensions in millimeters ? not to scale dimensions exclusive of mold ?ash, gate burrs, and dambar protrusions exact case and lead con?guration at supplier discretion within limits show n 0.635 bsc 0.25 0.15 0.25 max 1.75 max 8o 0o 1.27 0.41 0.25 bsc 1.04 ref 8.66 0.10 3.91 0.10 0.30 0.20 5.99 0.20 c 0.20 24x sea ting plane c 0.635 2.30 5.00 0.40 2 1 24 a c c b a b branded face branding scale and appearance at supplier discretion sea ting plane gauge plane pcb layout reference v iew pcb layout reference v iew n = device part number t=te mperature code lf = (literal) package type a=amperage nnnnnnnnnnnnn tlf-aaa lllllllllll te rminal #1 mark area reference pad layout (reference ipc7351 sop63p600x175-24m ) all pads a minimum of 0.20 mm from all adjacent pads; adjust as necessary to meet application process requirements and pcb layout tolerances package outline drawing galvanically isolated current sensor ic with differential output and externally adjustable gain ACS726 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
15 copyright ?2012-2014, allegro microsystems, llc allegro microsystems, llc reserves the right to make, from time to time, such departures from the detail specifications as may be required to permit improvements in the performance, reliability, or manufacturability of its products. before placing an order, the user is cautioned to verify that the information being relied upon is current. allegros products are not to be used in any devices or systems, including but not limited to life support devices or systems, in which a failure of allegros product can reasonably be expected to cause bodily harm. the information included herein is believed to be accurate and reliable. however, allegro microsystems, llc assumes no responsibility for its use; nor for any infringement of patents or other rights of third parties which may result from its use. revision date change C april 3, 2014 initial release 1 august 13. 2014 removed a deisgnator from part number and reformatted document document revision history galvanically isolated current sensor ic with differential output and externally adjustable gain ACS726 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com

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