description the a1301 and a1302 are continuous-time, ratiometric, linear hall-effect sensors. they are optimized to accurately provide a voltage output that is proportional to an applied magnetic field. these devices have a quiescent output voltage that is 50% of the supply voltage. two output sensitivity options are provided: 2.5 mv/g typical for the a1301, and 1.3 mv/g typical for the a1302. the hall-effect integrated circuit included in each device includes a hall sensing element, a linear amplifier, and a cmos class a output structure. integrating the hall sensing element and the amplifier on a single chip minimizes many of the problems normally associated with low voltage level analog signals. high precision in output levels is obtained by internal gain and offset trim adjustments made at end-of-line during the manufacturing process. these features make the a1301 and a1302 ideal for use in position sensing systems, for both linear target motion and rotational target motion. they are well-suited for industrial applications over extended temperature ranges, from ?40c to 125c. two device package types are available: lh, a 3-pin sot23w type for surface mount, and ua, a 3-pin ultramini sip for through-hole mount. they are lead (pb) free (suffix, ?t ) with 100% matte tin plated leadframes. a1301-ds, rev. 5 features and benefits ? low-noise output ? fast power-on time ? ratiometric rail-to-rail output ? 4.5 to 6.0 v operation ? solid-state reliability ? factory-programmed at end-of-line for optimum performance ? robust esd performance continuous-time ratiometric linear hall effect sensors functional block diagram not to scale packages: 3 pin sot23w (suffix lh), and 3 pin sip (suffix ua) a1301 and a1302 amp gnd vout vcc out offset trim control gain v+ vol tage regulator filter c bypass
continuous-time ratiometric linear hall effect sensors a1301 and a1302 2 allegro microsystems, inc. 115 northeast cutoff, box 15036 worcester, massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com selection guide part number pb-free 1 packing 2 package ambient, t a sensitivity (typical) a1301elhlt-t yes 7-in. tape and reel, 3000 pieces/reel surface mount ?40oc to 85oc 2.5 mv/g a1301eua-t yes bulk, 500 pieces/bag sip a1301klhlt-t yes 7-in. tape and reel, 3000 pieces/reel surface mount ?40oc to 125oc a1301kua-t yes bulk, 500 pieces/bag sip a1302elhlt-t yes 7-in. tape and reel, 3000 pieces/reel surface mount ?40oc to 85oc 1.3 mv/g a1302eua-t yes bulk, 500 pieces/bag sip a1302klhlt-t yes 7-in. tape and reel, 3000 pieces/reel surface mount ?40oc to 125oc a1302kua-t yes bulk, 500 pieces/bag sip 1 pb-based variants are being phased out of the product line. certain variants cited in this footnote are no longer in production the variants should not be purchased for new design applications. samples are no longer available. status change: may 1, 2006. these variants incl ude: a1301elhlt, a1301eua, a1301klhlt, a1301kua, a1302elhlt, a1302eua, a1302klhlt, and a1302kua. 2 contact allegro for additional packing options. absolute maximum ratings characteristic symbol notes rating units supply voltage v cc 8v output voltage v out 8v reverse supply voltage v rcc ?0.1 v reverse supply voltage v rcc ?0.1 v output sink current i out 10 ma operating ambient temperature t a range e ?40 to 85 oc range k ?40 to 125 oc maximum junction temperature t j (max) 165 oc storage temperature t stg ?65 to 170 oc
continuous-time ratiometric linear hall effect sensors a1301 and a1302 3 allegro microsystems, inc. 115 northeast cutoff, box 15036 worcester, massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com device characteristics over operating temperature range, t a , and v cc = 5 v, unless otherwise noted characteristic symbol test conditions min. typ. max. units electrical characteristics supply voltage v cc running, t j < 165c 4.5 ? 6 v supply current i cc output open ? ? 11 ma output voltage v out(high) i source = ?1 ma, sens = nominal 4.65 4.7 ? v v out(low) i sink = 1 ma, sens = nominal ? 0.2 0.25 v output bandwidth bw ? 20 ? khz power-on time t po v cc(min) to 0.95 v out; b = 1400 g; slew rate = 4.5 v/ s to 4.5 v/100 ns ?35 s output resistance r out i sink 1 ma, i source ?1 ma ? 2 5 wide band output noise, rms v outn external output low pass filter 10 khz; sens = nominal ? 150 ? v ratiometry quiescent output voltage error with respect to v cc 1 v outq(v) t a = 25c ? ? 3.0 % magnetic sensitivity error with respect to v cc 2 sens (v) t a = 25c ? ? 3.0 % output linearity lin t a = 25c ? ? 2.5 % symmetry sym t a = 25c ? ? 3.0 % magnetic characteristics quiescent output voltage v outq b = 0 g; t a = 25c 2.4 2.5 2.6 v quiescent output voltage over operating temperature range v outq( t a ) b = 0 g 2.2 ? 2.8 v magnetic sensitivity sens a1301; t a = 25c 2.0 2.5 3.0 mv/g a1302; t a = 25c 1.0 1.3 1.6 mv/g magnetic sensitivity over operating temperature range sens ( t a ) a1301 1.8 ? 3.2 mv/g a1302 0.85 ? 1.75 mv/g 1 refer to equation (4) in ratiometric section on page 4. 2 refer to equation (5) in ratiometric section on page 4.
continuous-time ratiometric linear hall effect sensors a1301 and a1302 4 allegro microsystems, inc. 115 northeast cutoff, box 15036 worcester, massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com characteristic definitions quiescent output voltage. in the quiescent state (no sig- nificant magnetic field: b = 0), the output, v outq , equals one half of the supply voltage, v cc , throughout the entire operating ranges of v cc and ambient temperature, t a . due to internal component tolerances and thermal considerations, there is a tolerance on the quiescent output voltage, v outq , which is a function of both v cc and t a . for purposes of specifica- tion, the quiescent output voltage as a function of temperature, v outq( t a ) , is defined as: where sens is in mv/g, and the result is the device equivalent accuracy, in gauss (g), applicable over the entire operating tem- perature range. sensitivity. the presence of a south-polarity (+b) magnetic field, perpendicular to the branded face of the device package, increases the output voltage, v out , in proportion to the magnetic field applied, from v outq toward the v cc rail. conversely, the application of a north polarity (?b) magnetic field, in the same orientation, proportionally decreases the output voltage from its quiescent value. this proportionality is specified as the magnetic sensitivity of the device and is defined as: the stability of the device magnetic sensitivity as a function of ambient temperature, sens ( t a ) (%) is defined as: ratiometric. the a1301 and a1302 feature a ratiometric output. this means that the quiescent voltage output, v outq , and the magnetic sensitivity, sens, are proportional to the supply voltage, v cc . the ratiometric change (%) in the quiescent voltage output is defined as: and the ratiometric change (%) in sensitivity is defined as: linearity and symmetry. the on-chip output stage is designed to provide linear output at a supply voltage of 5 v. although the application of very high magnetic fields does not damage these devices, it does force their output into a nonlinear region. linearity in percent is measured and defined as: and output symmetry as: v outq( ? ) sens ( 25 oc ) v outq( ) v outq( 25 oc ) C = () 2 b v out(Cb) v out(+b ) sens C = sens ( ? ) sens ( ) sens ( 25 oc ) sens ( 25 oc ) C = 100 % () () v cc 5v v outq(v cc ) v outq(5v) v outq( v) = 100 % () v cc 5v = 100 % sens ( v ) sens (v cc ) sens ( 5 v ) (5) = 100 % lin + 2 ( v out(+b?) Cv voutq ) C v out(+b) v outq () = 100 % lin C 2( v out(Cb?) Cv outq ) C v out(Cb) v outq () C = 100 % sym v out(+b) v outq Cv out(Cb) v outq ()
continuous-time ratiometric linear hall effect sensors a1301 and a1302 5 allegro microsystems, inc. 115 northeast cutoff, box 15036 worcester, massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com typical characteristics (30 pieces, 3 fabrication lots) continued on the next page... 2.35 2.40 2.45 2.50 2.55 2.60 2.65 C50 C25 0 25 50 75 100 125 150 1.24 1.26 1.28 1.30 1.32 1.34 1.36 1.38 1.40 -50 -25 0 25 50 75 100 125 150 2.40 2.45 2.50 2.55 2.60 C50 C25 0 25 50 75 100 125 150 2.40 2.45 2.50 2.55 2.60 C50 C25 0 25 50 75 100 125 150 4.5 5.0 5.5 6.0 4.5 5.0 5.5 6.0 lh package ua package lh package ua package 1301 device sensitivity vs. ambient temperature 1302 device sensitivity vs. temperature temperature (c) temperature (c) 1301 device v outq vs. ambient temperature 1302 device v outq vs. ambient temperature 1301 device sensitivity vs. supply voltage 1302 device sensitivity vs. supply voltage supply voltage (v) supply voltage (v) temperature (c) temperature (c) sensitivity (mv/g) sensitivity (mv/g) output voltage (v) output voltage (v) sensitivity (mv/g) sensitivity (mv/g) 1.5 2.0 2.5 3.0 3.5 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7
continuous-time ratiometric linear hall effect sensors a1301 and a1302 6 allegro microsystems, inc. 115 northeast cutoff, box 15036 worcester, massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com typical characteristics, continued (30 pieces, 3 fabrication lots) 1301 device v outq vs. supply voltage 4.5 5.0 5.5 6.0 1.5 2.0 2.5 3.0 3.5 4.5 5.0 5.5 6.0 4.5 5.0 5.5 6.0 4.5 5.0 5.5 6.0 99.0 99.1 99.2 99.3 99.4 99.5 99.6 99.7 99.8 99.9 100.0 4.5 5.0 5.5 6.0 99.5 99.6 99.7 99.8 99.9 100.0 100.1 100.2 100.3 100.4 100.5 4.5 5.0 5.5 6.0 supply voltage (v) linC lin+ linC lin+ 99.6 99.7 99.8 99.9 100.0 99.8 99.9 100.0 100.1 100.2 100.3 100.4 1302 device v outq vs. supply voltage 1301 device symmetry vs. supply voltage 1302 device symmetry vs. supply voltage 1301 device lin+ and linC vs. supply voltage 1302 device lin+ and linC vs. supply voltage output voltage (v) output voltage (v) linearity (%) linearity (%) symmetry (%) symmetry (%) supply voltage (v) supply voltage (v) supply voltage (v) supply voltage (v) supply voltage (v) 1.5 2.0 2.5 3.0 3.5
continuous-time ratiometric linear hall effect sensors a1301 and a1302 7 allegro microsystems, inc. 115 northeast cutoff, box 15036 worcester, massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com package lh, 3-pin; (sot-23w) 0.15 0.00 .006 .000 1.17 0.75 .046 .030 0.50 0.30 .020 .012 2.10 1.85 .083 .073 3.00 2.70 .118 .106 1.49 nom .059 0.96 nom .038 0.20 0.08 .008 .003 8o 0o 0.60 0.25 .024 .010 c seating plane a b 3x 0.20 [.008] m c a b 0.15 [.006] m c a b c 0.10 [.004] 3x 0.95 .037 1.90 .075 0.25 .010 3.04 2.80 .120 .110 2 1 3 gauge plane seating plane b a b preliminary dimensions, for reference only dimensions in millimeters u.s. customary dimensions (in.) in brackets, for reference only (reference jedec to-236 ab, except case width and terminal tip-to-tip) dimensions exclusive of mold flash, gate burrs, and dambar protrusions exact case and lead configuration at supplier discretion within limits shown hall element (not to scale) active area depth 0.28 [.011] a a a terminal list symbol number description package lh package ua vcc 1 1 connects power supply to chip vout 2 3 output from circuit gnd 3 2 ground package lh package ua pin-out drawings 23 1 2 1 3
continuous-time ratiometric linear hall effect sensors a1301 and a1302 8 allegro microsystems, inc. 115 northeast cutoff, box 15036 worcester, massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com the products described herein are manufactured under one or more of the following u.s. patents: 5,045,920; 5,264,783; 5,442,28 3; 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 de par tures from the detail spec i fi ca tions as may be required to permit improvements in the per for mance, reliability, or manufacturability of its products. before placing an order, the u ser 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 devices or sys tems without express written approval. the in for ma tion in clud ed herein is believed to be ac cu rate and reliable. how ev er, allegro microsystems, inc. assumes no re spon si bil i ty for its use; nor for any in fringe ment of patents or other rights of third parties which may result from its use. copyright ? 2005, 2006 allegro microsystems, inc. package ua, 3-pin sip b d d d .164 .159 4.17 4.04 .122 .117 3.10 2.97 .062 .058 1.57 1.47 .017 .014 0.44 0.35 .019 .014 0.48 0.36 .640 .600 16.26 15.24 .085 max 2.16 .050 nom 1.27 .031 ref 0.79 .0805 nom 2.04 1.44 .0565 nom dimensions in inches metric dimensions (mm) in brackets, for reference only 23 1 a a b c c dambar removal protrusion (6x) active area depth .0195 [0.50] nom d hall element (not to scale) ejector mark on opposite side
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