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the a3515C and a3516C are sensitive, temperature-stable linear hall- effect sensors with greatly improved offset characteristics. ratiometric, linear hall-effect sensors provide a voltage output that is proportional to the applied magnetic field and have a quiescent output voltage that is approximately 50% of the supply voltage. these magnetic sensors are ideal for use in linear and rotary position sensing systems in the harsh environments of automotive and industrial applications over extended temperatures to -40 c and +150 c. the a3515C features an output sensitivity of 5 mv/g, while the a3516C has an output sensitivity of 2.5 mv/g. see the magnetic characteristics table for complete, individual device parametrics. each bicmos monolithic circuit integrates a hall element, improved temperature-compensating circuitry to reduce the intrinsic sensitivity drift of the hall element, a small-signal high-gain amplifier, and a rail-to-rail low- impedance output stage. a proprietary dynamic offset cancelation technique, with an internal high-frequency clock, reduces the residual offset voltage, which is normally caused by device overmolding, temperature dependancies, and thermal stress. this technique produces devices that have an extremely stable quiescent output voltage, are immune to mechanical stress, and have precise recover- ability after temperature cycling. many problems normally associated with low-level analog signals are minimized by having the hall element and amplifier in a single chip. output precision is obtained by internal gain and offset trim adjustments during the manufacturing process. these devices are supplied in a 3-pin ultra-mini-sip ua package. features temperature-stable quiescent output voltage precise recoverability after temperature cycling output voltage proportional to applied magnetic field ratiometric rail-to-rail output improved sensitivity 4.5 v to 5.5 v operation immune to mechanical stress small package size solid-state reliability ratiometric, linear hall-effect sensors for high-temperature operation data sheet 27501.10b 3515 and 3516 always order by complete part number, e.g., a3515lua . pinning is shown viewed from branded side. absolute maximum ratings supply voltage, v cc .............................. 8.0 v output voltage, v o ................................ 8.0 v output sink current, i o ....................... 10 ma magnetic flux density, b .............. unlimited package power dissipation, p d ........................................... see graph 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 * infrequent excursions permitted; see applications information. dwg. ph-006 1 supply v cc ground 3 2 output x
3515 and 3516 ratiometric, linear hall-effect sensors 115 northeast cutoff, box 15036 worcester, massachusetts 01615-0036 (508) 853-5000 2 dwg. fh-016a ground 2 output 3 1 x dynamic offset cancellation low-pass filter + + supply vcc vcc/2 600 400 200 20 60 100 140 0 ambient temperature in c allowable package power dissipation in milliwatts dwg. gh-046a suffix "?a" r ja = 165 c/w 40 80 120 180 700 500 300 100 160 800 suffix "e? suffix "l? suffix "?" r ja = 184 c/w copyright ? 1996, 2002 allegro microsystems, inc. functional block diagram
3515 and 3516 ratiometric, linear hall-effect sensors www.allegromicro.com 3 electrical characteristics over operating temperature range, at v cc = 5 v (unless otherwise noted). limits characteristic symbol test conditions min. typ. max. units supply voltage v cc operating 4.5 5.0 5.5 v supply current i cc b = 0, v cc = 6 v, i o = 0 C 7.2 10 ma quiescent v oq b = 0, i o = 1 ma, t a = 25 c 2.425 2.500 2.575 v voltage output output voltage v oh b = +x*, i o = 1 ma C 4.7C v v ol b = -x*, i o = -1 ma C 0.2 C v output i olm b = -x*, v o = 0 -1.0 -1.5 C ma source current limit bandwidth (-3 db) bw C 30 C khz clock frequency f c C 170 C khz output resistance r o i o -2 ma C 1.0 C ? wide-band e o b = 0, bw = 10 hz to 10 khz, C 400 C v output noise (rms) i o -1 ma, c o = 100 pf note 1 C typical data is at t a = 25 c and is for design information only. note 2 C negative current is defined as coming out of (sourcing) the output. * this test requires positive and negative fields sufficient to swing the output driver between fully off and saturated (on), r espec- tively. it is not intended to indicate a range of linear operation.
3515 and 3516 ratiometric, linear hall-effect sensors 115 northeast cutoff, box 15036 worcester, massachusetts 01615-0036 (508) 853-5000 4 magnetic characteristics over operating temperature range, at v cc = 5 v, i o = -1 ma (unless otherwise noted). part numbers a3515eua a3515lua a3516eua a3516lua characteristic* min. typ. max. min. typ. max. min. typ. max. min. typ. max. units operating temp. range, t a -40 C +85 -40 C +150 -40 C +85 -40 C +150 c sensitivity at t a = 25 c 4.50 5.00 5.50 4.50 5.00 5.50 2.25 2.50 2.75 2.25 2.50 2.75 mv/g ? sens ( ? t) at t a = max. -2.5 2.5 7.5 -2.5 2.5 7.5 -2.5 2.5 7.5 -2.5 2.5 7.5 % ? sens ( ? t) at t a = min. -9.0 -1.3 1.0 -9.0 -1.3 1.0 -9.0 -1.3 1.0 -9.0 -1.3 1.0 % ? v oq( ? t) ? CC 10 C C 10 C C 10 C C 10 g ratiometry, ? v oq( ? v) C 100 C C 100 C C 100 C C 100 C % ratiometry, ? sens ( ? v) C 100 C C 100 C C 100 C C 100 C % positive linearity, lin+ C 100 C C 100 C C 100 C C 100 C % negative linearity, linC C 100 C C 100 C C 100 C C 100 C % symmetry C 100 C C 100 C C 100 C C 100 C % note 1 C magnetic flux density is measured at most sensitive area of device located 0.0195" (0.50 mm) below the branded face of the ua package. note 2 C 10 g = 1 mt, exactly. note 3 C except for ? sens ( ? t) , typical data is at t a = 25 c and is for design information only. * see characteristics definitions for test conditions. ? this calculation (formula 1, next page) yields the devices equivalent accuracy, over the operating temperature range, in gau ss.
3515 and 3516 ratiometric, linear hall-effect sensors www.allegromicro.com 5 ratiometry. the a3515xua and a3516xua feature a ratiometric output. the quiescent voltage output and sensitivity are proportional to the supply voltage (ratiometric). the per cent ratiometric change in the quiescent voltage output is defined as ? v oq( ? v) = v oq(vcc) / v oq(5v) x 100% (4) v cc / 5 v and the per cent ratiometric change in sensitivity is defined as ? sens ( ? v) = sens (vcc) / sens (5v) x 100% (5) v cc / 5 v linearity and symmetry. the on-chip output stage is de- signed to provide a linear output to within 500 mv of either rail with a supply voltage of 5 v. this is equivalent to approxi- mately 800 gauss of ambient field. although application of stronger magnetic fields will not damage these devices, it will force the output into a non-linear region. linearity in per cent is measured and defined as lin+ = v o(500g) C v oq x 100% (6) 2 (v o(250g) C v oq ) linC = v o(-500g) C v oq x 100% (7) 2 (v o(-250g) C v oq ) and output symmetry as sym = v o(500g) C v oq x 100% (8) v oq C v o(-500g) characteristics definitions quiescent voltage output. in the quiescent state (no mag- netic field), the output is ideally equal to one-half of the supply voltage over the operating voltage and temperature range (v oq v cc / 2 ). due to internal component tolerances and thermal considerations, there is a tolerance on the quiescent voltage output and on the quiescent voltage output as a function of supply voltage and ambient temperature. for purposes of specification, the quiescent voltage output as a function of temperature is defined as ? v oq( ? t) = v oq(ta) C v oq(25 c) (1) sens (25 c) this calculation yields the devices equivalent accuracy, over the operating temperature range, in gauss. sensitivity. the presence of a south-pole magnetic field perpendicular to the package face (the branded surface) will increase the output voltage from its quiescent value toward the supply voltage rail by an amount proportional to the magnetic field applied. conversely, the application of a north pole will decrease the output voltage from its quiescent value. this proportionality is specified as the sensitivity of the device and is defined as sens = v o(500g) C v o(-500g) (2) 1000 g the stability of sensitivity as a function of temperature is defined as ? sens ( ? t) = sens (ta) C sens (25 c) x 100% (3) sens (25 c)
3515 and 3516 ratiometric, linear hall-effect sensors 115 northeast cutoff, box 15036 worcester, massachusetts 01615-0036 (508) 853-5000 6 typical characteristics 0 25 50 75 100 ambient temperature in c -50 dwg. gh-039-2 125 -25 supply current in ma 9.0 8.0 7.0 6.0 150 vcc = 5.5 v 0 25 50 75 100 1.4 0.4 ambient temperature in c 1.2 0.8 -50 dwg. gh-060-1 output resistance in ? ? ? ? 150 -25 125 1.0 0.6 vcc = 5 v i o = -1 ma i o = 1 ma i o = 5 ma i o = 10 ma 0 25 50 75 100 ambient temperature in c 2.55 2.45 -50 dwg. gh-067 quiescent output voltage in volts 150 -25 125 2.50 vcc = 5 v io = -1 ma a3516 a3515 2.46 2.47 2.48 2.49 2.51 2.52 2.53 2.54 0 25 50 75 100 6.0 1.0 ambient temperature in c 5.0 3.0 -50 dwg. gh-066 sensitivity in mv/g 150 -25 125 4.0 2.0 a3516 a3515 vcc = 5 v io = -1 ma 0
3515 and 3516 ratiometric, linear hall-effect sensors www.allegromicro.com 7 qualification test test method and test conditions test length samples comments temperature humidityjesd22-a101 1000 hrs 77 device biased for bias life t a = 85 c, rh = 85% minimum power bias life jesd22-a108 1000 hrs 77 t a = 150 c, t j = 165 c (surge operating life) jesd22-a108 168 hrs 77 t a = 175 c, t j = 190 c autoclave, unbiased jesd22-a102 96 hrs 77 t a = 121 c, 15 psig high-temperature jesd22-a103 1000 hrs 77 (bake) storage life t a = 170 c temperature cycle jesd22-a104 1000 cycles 77 esd, cdf-aec-q100-002 pre/post 3 per test to failure human body model reading test all leads > 3 kv all allegro sensors are subjected to stringent qualification requirements prior to being released to production. to become qualified, except for the destructive esd tests, no failures are permitted. criteria for device qualification
3515 and 3516 ratiometric, linear hall-effect sensors 115 northeast cutoff, box 15036 worcester, massachusetts 01615-0036 (508) 853-5000 8 1 3 2 dwg. mh-011-7a 0.0195" 0.50 mm nom branded surface active area depth 0.081" 2.06 mm 0.056" 1.42 mm a suffix ua b n x 6.9 g/a dwg. ah-005a typical current-sensing application sensor location applications information calibrated linear hall devices, which can be used to deter- mine the actual flux density presented to the sensor in a particu- lar application, are available. for safe, reliable operation, the output should not be pulled above the supply voltage or pulled below the device ground. for optimum performance, a 0.1 f capacitor between the supply and ground, and a 100 pf capacitor between the output and ground, should be added. the ratiometric feature is especially valuable when these devices are used with an analog-to-digital converter. a/d converters typically derive their lsb step size by ratioing off a reference voltage line. if the reference voltage varies, the lsb will vary proportionally. this is a major error source in many sensing systems. the a3515xua and a3516xua can eliminate this source of error by their ratiometric operation. because their gain and offsets are proportional to the supply voltage, if they are powered from the a/d reference voltage, the sensor output voltage will track changes in the lsb value. these devices can withstand infrequent temperature excur- sions, beyond the absolute maximum ratings, to t a = 170 c provided the junction temperature, t j , does not exceed 200 c. extensive applications information on hall-effect sensors and magnets is also available in the hall-effect ic applications guide, which can be found in the latest issue of the allegro microsystems electronic data book , ams-702 or application note 27701, or at www.allegromicro.com allegro
3515 and 3516 ratiometric, linear hall-effect sensors www.allegromicro.com 9 0 0 relative distance relative magnetic flux density dwg. gh-048 relative output voltage v cc v oq -0.4 -0.2 0.2 0.4 + gnd - n s d 0.19 0 0 relative distance (total effective air gap) relative magnetic flux density dwg. gh-047 relative output voltage v cc v oq n s d sensor depth below package face 0.1 0.2 0.3 0.4 0.5 + 0 0 relative distance relative magnetic flux density dwg. gh-050 relative output voltage v cc v oq n s 0.05 0.10 0.15 0.20 0.25 + d effective air gap 0.21 effective air gap = 0.050 effective air gap = 0.075 effective air gap = 0.095 0 0 relative distance relative magnetic flux density dwg. gh-049 relative output voltage v cc v oq -0.06 -0.04 0.04 0.06 0.08 + gnd - -0.08 0.10 -0.10 n s s n n s s n d 0.21 d 0.19 s n n s typical position-sensing applications (alnico 8, dimensions in inches)
3515 and 3516 ratiometric, linear hall-effect sensors 115 northeast cutoff, box 15036 worcester, massachusetts 01615-0036 (508) 853-5000 10 a3515xua and a3516xua dimensions in inches (controlling dimensions) dimensions in millimeters (for reference only) 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 a351xxua-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
3515 and 3516 ratiometric, linear hall-effect sensors www.allegromicro.com 11 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. 0.095 0.005 0.020 min flat dwg. mh-015 in 0.004 max 0.002 max 0 8 2.41 0.13 0.51 min flat dwg. mh-015 mm 0.10 max 0.051 max 0 8 surface-mount lead form (add -tl to part number) note: supplied in bulk pack (500 devices per bag). dimensions in inches (controlling dimensions) dimensions in millimeters (for reference only)
3515 and 3516 ratiometric, linear hall-effect sensors 115 northeast cutoff, box 15036 worcester, massachusetts 01615-0036 (508) 853-5000 12 hall-effect sensors linear hall-effect sensors partial equivalent part supply typical accuracy oper. number voltage (v) sensitivity (see note 3) temp. packages comments ugn3503 4.5 to 6 1.3 mv/g s lt, ua a3515x 4.5 to 5.5 5 mv/g < 10 g e, l ua chopper stabilized a3516x 4.5 to 5.5 2.5 mv/g < 10 g e, l ua chopper stabilized a3517x 4.5 to 5.5 5 mv/g < 20 g s, l ua chopper stabilized a3518x 4.5 to 5.5 2.5 mv/g < 20 g s, l ua 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. 3) linear hall-effect equivalent accuracy is defined as ? v oq over the operating temperature range, divided by sensitivity.

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