A1201, A1202, A1203, and A1204
Continuous-Time Bipolar Switch Family
The Allegro® A1201, A1202, A1203 and A1204 Hall-effect bipolar switches are
next-generation replacements and extension of the popular Allegro A3134, A3133,
and A3132 bipolar switch product line. Overall, the A120x family, produced with
BiCMOS technology, consists of continuous-time devices that feature fast power-
on time and low-noise operation. Device programming is performed after packag-
ing, to ensure increased switchpoint accuracy by eliminating offsets that can be
induced by package stress. Unique Hall element geometries and low-offset ampli-
fiers help to minimize noise and to reduce the residual offset voltage normally
caused by device overmolding, temperature excursions, and thermal stress.
Package LH, 3-pin Surface Mount
3
1
2
3
The A120x Hall-effect bipolar switches include the following on a single silicon
chip: voltage regulator, Hall-voltage generator, small-signal amplifier, Schmitt
trigger, and NMOS output transistor. The integrated voltage regulator permits
operation from 3.8 to 24 V. The extensive on-board protection circuitry makes
possible a ±30 V absolute maximum voltage rating for superior protection in auto-
motive and motor commutation applications, without adding external components.
All devices in the family are identical, except for magnetic switchpoints.
1
2
The small geometries of the BiCMOS process allow these devices to be pro-
vided in ultrasmall packages. The package styles available provide magnetically
optimized solutions for most applications. Package LH is a SOT23W, a miniature
low-profile surface-mount package, while package UA is a three-lead ultramini
SIP for through-hole mounting. Each package is lead (Pb) free, with 100% matte
tin plated leadframes.
Package UA, 3-pin SIP
Features and Benefits
2
1
3
ꢀContinuous-time operation
– Fast power-on time
1
– Low noise
2
3
ꢀStable operation over full operating temperature range
ꢀReverse battery protection
ꢀSolid-state reliability
ABSOLUTE MAXIMUM RATINGS
ꢀFactory-programmed at end-of-line for optimum performance
ꢀRobust EMC performance
ꢀHigh ESD rating
Supply Voltage, VCC ..........................................30 V
Reverse-Supply Voltage, VRCC ........................–30 V
Output Off Voltage, VOUT..................................30 V
Reverse-Output Voltage, VROUT .....................–0.5 V
Output Current, IOUTSINK............................... 25 mA
Magnetic Flux Density, B .........................Unlimited
Operating Temperature
ꢀRegulator stability without a bypass capacitor
Ambient, TA, Range E..................–40ºC to 85ºC
Ambient, TA, Range L................–40ºC to 150ºC
Maximum Junction, TJ(max)........................165ºC
Storage Temperature, TS ..................–65ºC to 170ºC
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
A1201-DS, Rev.2
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