these hall-effect switches are monolithic integrated circuits with tighter magnetic specifications, designed to operate continuously over extended temperatures to +150 c, and are more stable with both tem- perature and supply voltage changes. the unipolar switching character- istic makes these devices ideal for use with a simple bar or rod magnet. the three basic devices (A3121, a3122, and a3123) are identical except for magnetic switch points. each device includes a voltage regulator for operation with supply voltages of 4.5 volts to 24 volts, reverse battery protection diode, qua- dratic hall-voltage generator, temperature compensation circuitry, small- signal amplifier, schmitt trigger, and an open-collector output to sink up to 25 ma. with suitable output pull up, they can be used with bipolar or cmos logic circuits. the A3121 is an improved replacement for the ugx3113 and ugx3119. the first character of the part number suffix determines the device operating temperature range. suffix eC is for the automotive and industrial temperature range of -40 c to +85 c. suffix lC is for the automotive and military temperature range of -40 c to +150 c. two package styles provide a magnetically optimized package for most applications. suffix Clt is a miniature sot89/to-243aa transistor package for surface-mount applications; suffix Cua is a three-lead ultra-mini-sip. hall-effect switches for high-temperature operation always order by complete part number, e.g., A3121eua . absolute maximum ratings at t a = +25 c supply voltage, v cc ........................... 30 v reverse battery voltage, v rcc ........ -30 v magnetic flux density, b ....... unlimited output off voltage, v out ................ 28 v reverse output voltage, v out ........ -0.5 v continuous output current, i out ... 25 ma operating temperature range, t a suffix eC ................. -40 c to +85 c suffix lC ............... -40 c to +150 c storage temperature range, t s .............................. -65 c to +170 c features and benefits superior temp. stability for automotive or industrial applications 4.5 v to 24 v operation needs only an unregulated supply open-collector 25 ma output compatible with digital logic reverse battery protection activate with small, commercially available permanent magnets solid-state reliability no moving parts small size resistant to physical stress data sheet 27621.4c* pinning is shown viewed from branded side. 3121, 3122, and 3123 dwg. ph-003a 1 supply v cc ground 3 2 output x
3121, 3122, and 3123 hall-effect switches for high-temperature operation 115 northeast cutoff, box 15036 worcester, massachusetts 01615-0036 (508) 853-5000 2 functional block diagram limits characteristic symbol test conditions min. typ. max. units supply voltage v cc operating 4.5 24 v output saturation voltage v out(sat) i out = 20 ma, b > b op 140400 mv output leakage current i off v out = 24 v, b < b rp <1.010 a supply current i cc b < b rp (output off) 4.6 9.0ma output rise time t r r l = 820 ? , c l = 20 pf 0.04 2.0 s output fall time t f r l = 820 ? , c l = 20 pf 0.18 2.0 s electrical characteristics over operating temperature range, at v cc = 12 v. magnetic characteristics in gauss over operating supply voltage range. part numbers* A3121 a3122 a3123 characteristic min. typ. max. min. typ. max. min. typ. max b op at t a = 25 c 250350450 280340400 250345 440 over operating temp. range 220350500 260340430 230345 470 b rp at t a = 25 c 125 245 380 140235 330 180240300 over operating temp. range 80245 410 120235 360 160240330 b hys at t a = 25 c 70105 140 70105 140 70105 140 over operating temp. range 60105 150 70105 140 70105 140 notes: typical values are at t a = +25 c and v cc = 12 v. b op = operate point (output turns on); b rp = release point (output turns off); b hys = hysteresis (b op - b rp ). *complete part number includes a suffix to identify operating temperature range (e- or l-) and package type ( -lt or -ua). v cc x reg. dwg. fh-005-2 ground output 3 2 1 copyright ? 1992, 2002 allegro microsystems, inc.
3121, 3122, and 3123 hall-effect switches for high-temperature operation www.allegromicro.com 3 switch points output saturation voltage * complete part number includes a suffix denoting operating temperature range (e- or l-) and package type ( -lt or -ua). typical operating characteristics 0 50 100 ambient temperature in c -50 dwg. gh-038 switch point in gauss 300 400 200 100 operate point release point v = 12 v cc 150 0 -25 25 75 125 0 25 50 75 100 300 0 ambient temperature in c 200 100 -50 dwg. gh-040 saturation voltage in mv 150 -25 125 i = 20 ma v = 4.5?4 v out cc 0 25 50 75 100 ambient temperature in c -50 dwg. gh-039 125 -25 v = 12 v cc supply current in ma 7.0 6.0 5.0 4.0 150 b b rp b b op 10 15 20 25 supply voltage in volts 0 dwg. gh-041 5 supply current in ma 0 2.0 4.0 6.0 8.0 10 b b op b b rp t = +25 c a supply current supply current
3121, 3122, and 3123 hall-effect switches for high-temperature operation 115 northeast cutoff, box 15036 worcester, massachusetts 01615-0036 (508) 853-5000 4 sensor locations ( 0.005" [0.13 mm] die placement) operation the output of these devices (pin 3) switches low when the mag- netic field at the hall sensor exceeds the operate point threshold (b op ). at this point, the output voltage is v out(sat) . when the magnetic field is reduced to below the release point threshold (b rp ), the device output goes high. the difference in the magnetic operate and release points is called the hysteresis (b hys ) of the device. this built-in hysteresis allows clean switching of the output even in the presence of external mechani- cal vibration and electrical noise. applications information extensive applications information for hall-effect sensors is available in: ? hall-effect ic applications guide , application note 27701; ? hall-effect devices: soldering, gluing, potting, encapsulating, and lead forming , application note 27703.1; ? soldering of through-hole hall-sensor dervices , application note 27703; and ? soldering of surface-mount hall-sensor devices , application note 27703.2. all are provided in allegro electronic data book , ams-702. or at www.allegromicro.com change in operate point suffix lt suffix ua 0.043" 1.09 mm 1 3 2 dwg. mh-008-2d 0.0305" 0.775 mm nom active area depth 0.089" 2.26 mm a 1 3 2 dwg. mh-011-2d 0.0195" 0.50 mm nom branded surface active area depth 0.082" 2.07 mm 0.055" 1.38 mm a 10 15 20 25 supply voltage in volts 0 dwg. gh-042 5 change in operate point in gauss -5.0 0 5.0 10 15 20 t = +25 c a allegro
3121, 3122, and 3123 hall-effect switches for high-temperature operation www.allegromicro.com 5 dwg. ma-009-3a in 1 23 0.072 0.064 0.167 0.155 0.059 bsc 0.0189 0.0142 0.047 0.035 0.102 0.090 0.063 0.055 0.0173 0.0138 0.090 0.084 0.0221 0.0173 0.118 bsc 0.181 0.173 dwg. ma-009-3a mm 1 23 4.60 4.40 1.83 1.62 4.25 3.94 1.50 bsc 0.48 0.36 1.20 0.89 2.60 2.29 1.60 1.40 0.44 0.35 2.29 2.13 0.56 0.44 3.00 bsc package designator lt (sot89/to-243aa) dimensions in inches (for reference only) dimensions in millimeters (controlling dimensions) notes: 1. exact body and lead configuration at vendor? option within limits shown. 2. supplied in bulk pack (500 pieces per bag) or add "tr" to part number for tape and reel. 3. only low-temperature ( 240 c) reflow-soldering techniques are recommended for sot89 devices. 1 b 0.098 0.031 0.102 0.047 0.181 0.079 dwg. ma-012-3 in pads 1, 2, 3, and a standard sot89 layout pads 1, 2, 3, and b low-stress version pads 1, 2, and 3 only lowest stress, but not self aligning 2 0.028 typ 0.031 typ a 3 13 b 2.5 0.8 2.6 1.2 4.6 2.0 dwg. ma-012-3 mm pads 1, 2, 3, and a standard sot89 layout pads 1, 2, 3, and b low-stress version pads 1, 2, and 3 only lowest stress, but not self aligning 2 0.7 typ 0.8 typ a
3121, 3122, and 3123 hall-effect switches for high-temperature operation 115 northeast cutoff, box 15036 worcester, massachusetts 01615-0036 (508) 853-5000 6 dimensions in inches (controlling dimensions) dimensions in millimeters (for reference only) package designator ua notes: 1. tolerances on package height and width represent allowable mold offsets. dimensions given are measured at the widest point (parting line). 2. exact body and lead configuration at vendor? option within limits shown. 3. height does not include mold gate flash. 4. recommended minimum pwb hole diameter to clear transition area is 0.035" (0.89 mm). 5. where no tolerance is specified, dimension is nominal. 6. supplied in bulk pack (500 pieces per bag). dwg. mh-014e in 0.164 0.159 0.062 0.058 0.0173 0.0138 0.050 bsc 45 0.640 0.600 0.0189 0.0142 0.085 max 45 0.031 123 0.122 0.117 see note dwg. mh-014e mm 4.17 4.04 1.57 1.47 0.44 0.35 1.27 bsc 45 16.26 15.24 0.48 0.36 2.16 max 45 0.79 123 3.10 2.97 see note radial lead form (order a312xxua-lc) note: lead-form dimensions are the nominals produced on the forming equipment. no dimensional tolerance is implied or guaranteed for bulk packaging (500 pieces per bag). 0.620" 0.500" (15.7 mm 12.7 mm) 0.100" (2.5 mm) dwg. mh-026 0.108" (2.74 mm) 123
3121, 3122, and 3123 hall-effect switches for high-temperature operation www.allegromicro.com 7 hall-effect sensors unipolar hall-effect digital switches partial operate release hysteresis replaces part point (g) point (g) (g) oper. and number over oper. voltage & temp. range temp. packages comments A3121x 220 to 500 80 to 410 60 to 150 e, l lt, ua 3019, 3113, 3119 a3122x 260 to 430 120 to 360 70 to 140 e, l lt, ua a3123x 230 to 470 160 to 330 70 to 140 e, l lt, ua a3141x 30 to 175 10 to 145 20 to 80 e, l lt, ua 3040, 3140 a3142x 115 to 245 60 to 190 30 to 80 e, l lt, ua a3143x 205 to 355 150 to 300 30 to 80 e, l lt, ua a3144x 35 to 450 25 to 430 >20 e, l lt, ua 3020, 3120 a3161e <160 (typ 130) >30 (typ 110) 5 to 80 e lt, ua 2-wire operation a3163e <160 (typ 98) >30 (typ 79) 5 to 40 e lt, ua 2-wire a3240x <50 (typ 35) >5 (typ 25) typ 10 e, l lh, lt, ua chopper stabilized a3250x <50 to >350 _ 5 to 35 j, l ua programmable, chopper stabilized a3251x <50 to >350 _ 5 to 35 j, l ua programmable, chopper stabilized a3361e <125 >405 to 30e lh, lt, ua 2-wire, chopper stabilized, output normally high a3362e <125 >405 to 30e lh, lt, ua 2-wire, chopper stabilized, output normally low micropower omnipolar hall-effect digital switches partial operate release hysteresis average part points (g) points (g) (g) oper. supply number over oper. voltage & temp. range temp. packages current ( a) a3209e >-60, <60 <-5, >5 typ 7.7 e lh, ua <425 (typ 145) a3210e >-60, <60 <-5, >5 typ 7.7 e lh, ua <60 (typ 8.8) a3212e >-55, <55 <-10, >10 typ. 8 e lh, ua <10 (typ 4.2) bipolar hall-effect digital switches partial operate release hysteresis replaces part point (g) point (g) (g) oper. and number over oper. voltage & temp. range temp. packages comments ugx3132 <95 (typ 32) >-95 (typ -20) >30 (typ 52) k, l, s lt, ua 3030, 3130, 3131 ugx3133 <75 (typ 32) >-75 (typ -20) >30 (typ 52) k, l, s lt, ua ugx3134 -40 to 50 -50 to 40 5 to 55 e, l lt, ua a3260x <30 (typ 10) >-30 (typ -10) typ 20 e, l lh, lt, ua 2 wire, chopper stabilized notes: 1) typical data is at t a = +25 c and nominal operating voltage. 2) x = operating temperature range [suffix letter or (prefix)]: s (ugn) = -20 c to +85 c, e = -40 c to +85 c, j = -40 c to +115 c, k (ugs) = -40 c to +125 c, l (ugl) = -40 c to +150 c.
3121, 3122, and 3123 hall-effect switches for high-temperature operation 115 northeast cutoff, box 15036 worcester, massachusetts 01615-0036 (508) 853-5000 8 the products described herein are manufactured under one or more of the following u.s. patents: 5,045,920; 5,264,783; 5,442,283; 5,389,889; 5,581,179; 5,517,112; 5,619,137; 5,621,319; 5,650,719; 5,686,894; 5,694,038; 5,729,130; 5,917,320; and other patents pending. allegro microsystems, inc. 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. allegro products are not authorized for use as critical components in life-support appliances, devices, or systems without express written approval. the information included herein is believed to be accurate and reliable. however, allegro microsystems, inc. assumes no responsibil- ity for its use; nor for any infringements of patents or other rights of third parties that may result from its use.
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