A1202 and A1203: Continuous-Time Bipolar Switch Family

Description

The Allegro A1202 and A1203 Hall-effect bipolar switches are next-generation replacements and extension of the popular Allegro 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 packaging, to ensure increased switchpoint accuracy by eliminating offsets that can be induced by package stress. Unique Hall element geometries and low-offset amplifiers help to minimize noise and to reduce the residual offset voltage normally caused by device overmolding, temperature excursions, and thermal stress.

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 automotive and motor commutation applications, without adding external components. All devices in the family are identical, except for magnetic switchpoints.

Top Features

  • AEC-Q100 automotive qualified 
  • Continuous-time operation
    • Fast power-on time
    • Low noise
  • Stable operation over full operating temperature range
  • Reverse-battery protection
  • Solid-state reliability
  • Factory-programmed at end-of-line for optimum performance
  • Robust EMC performance
  • High ESD rating
  • Regulator stability without a bypass capacitor

Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Compliant
Part Composition /
RoHS Data
Comments Samples Check Stock
A1202LUA-T 3-lead SIP -40°C to 150°C Yes View Data Contact your
local sales rep
Check
Distributor Stock
A1203EUA-T 3-lead SIP -40°C to 85°C Yes View Data Contact your
local sales rep
Check
Distributor Stock
A1203LLHLT-T 3-lead SOT -40°C to 150°C Yes View Data Contact your
local sales rep
Check
Distributor Stock
A1203LLHLX-T 3-lead SOT -40°C to 150°C Yes View Data Contact your
local sales rep
Check
Distributor Stock
A1203LUA-T 3-lead SIP -40°C to 150°C Yes View Data Contact your
local sales rep
Check
Distributor Stock

Allegro’s 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 Allegro’s product can reasonably be expected to cause bodily harm.

Packaging

The small geometries of the BiCMOS process allow these devices to be provided 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 throughhole mounting.

Package

Design Support Tools

Replacement Device Characteristics Table

Device A120x Characteristics
BOP BRP Hys
Legacy Replacement Min Max Min Max Min Max
A1201 A1205 -40 50 -50 40 5 55
A1204 A1203 - 95 -95 - 30 -
UGx3133 A1202 - 75 -75 - 30 -
UGx3132 A1203 - 95 -95 - 30 -
A3134 A1205 -40 50 -50 40 5 55