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Datasheets:
A1201: Continuous-Time Bipolar Switch (PDF)
Selection Guides:
Hall-Effect Sensor ICs,
Bipolar Hall-Effect Digital Switches
Press Releases:
A1201/02/03/04: Allegro MicroSystems, Inc. Replaces Bipolar Switch Family for Improved Performace and Additional Packaging Options
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A1201
Continuous-Time Bipolar Switch
Replacement Device Characteristics Table
These parts are no longer in production. The device should not be purchased for new design applications. Samples are no longer available. Date of status change: May 4, 2009.
| Device | A120x Characteristics | ||||||
|---|---|---|---|---|---|---|---|
| BOP | BRP | Hys | |||||
| Legacy | Replacement | Min | Max | Min | Max | Min | Max |
| A1201 | A1205 | -40 | 50 | -50 | 40 | 5 | 55 |
Features and Benefits
- 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
Description
The Allegro® A1201 Hall-effect bipolar switch is a next-generation replacement and extension of the popular Allegro A3134 bipolar switch. Overall, the A1201, produced with BiCMOS technology, is a continuous-time device that features 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 lowoffset amplifiers help to minimize noise and to reduce the residual offset voltage normally caused by device overmolding, temperature excursions, and thermal stress.
The A1201 Hall-effect bipolar switch includes 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. The device is a member of the A1201 product family which has identical electrical characteristics throughout, but provides a range of magnetic switchpoints.
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. Each package is lead (Pb) free, with 100% matte tin plated leadframes.
Functional Block Diagram
| Part Number | Package Type | RoHS Compliant |
Part Composition/ RoHS Data |
Temperature | Comments | Samples | Distributor Stock |
|---|---|---|---|---|---|---|---|
| A1201EUA-T | 3-pin SIP | Yes | view data | -40 °C to 85 °C | discontinued; refer to A1205EUA-T. discontinued |
Contact Local Sales Representative or check distributor stock |
|
| A1201LUA-T | 3-pin SIP | Yes | view data | -40 °C to 150 °C | discontinued; refer to A1205LUA-T. discontinued |
Contact Local Sales Representative or check distributor stock |
Allegro's products are not to be used in life support devices or systems, if a failure of an Allegro product can reasonably be expected to cause the failure of that life support device or system, or to affect the safety or effectiveness of that device or system.