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Datasheets:
A1220, 1221, A1222, and A1223: Chopper Stabilized Precision Hall Effect Latches (PDF)
Selection Guides:
Hall-Effect Sensor ICs,
Hall-Effect Digital Latches
Press Releases:
A1120, A1220, A1221: Allegro MicroSystems, Inc. Introduces a New Family of Switches and Latches,
A1120, A1220, A1221: Halleffekt-Schalter und -Latches mit verbesserter Schaltpunktpräzision und verschiedenen Gehäuse-Optionen,
A1120, A1220, A1221: Capteurs à effet Hall unipolaire et bipolaire Latché offrant une répétabilité améliorée,
A1222: Allegro MicroSystems, Inc. Introduces a New Addition to Their Family of Switches and Latches
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A1220, A1221, A1222, and 1223
Chopper-Stabilized Precision Hall Effect Latches
Features and Benefits
- Symmetrical latch switchpoints
- Resistant to physical stress
- Superior temperature stability
- Output short-circuit protection
- Operation from unregulated supply down to 3 V
- Reverse battery protection
- Solid-state reliability
- Small package sizes
Description
The A1220, A1221, A1222, and A1223 Hall-effect sensor ICs are extremely temperature-stable and stress-resistant devices especially suited for operation over extended temperature ranges to 150°C. Superior high-temperature performance is made possible through dynamic offset cancellation, which reduces the residual offset voltage normally caused by device overmolding, temperature dependencies, and thermal stress. Each device includes on a single silicon chip a voltage regulator, Hall-voltage generator, small-signal amplifier, chopper stabilization, Schmitt trigger, and a short-circuit protected open-drain output to sink up to 25 mA. A south pole of sufficient strength turns the output on. A north pole of sufficient strength is necessary to turn the output off.
An onboard regulator permits operation with supply voltages of 3 to 24 V. The advantage of operating down to 3 V is that the device can be used in 3-V applications or with additional external resistance in series with the supply pin for greater protection against high voltage transient events.
Two package styles provide magnetically optimized packages for most applications. Package type LH is a modified 3-pin SOT23W surface mount package while UA is a three-pin ultramini SIP for through hole mounting. Both packages are 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 |
|---|---|---|---|---|---|---|---|
| A1220ELHLT-T | 3-lead SOT | Yes | view data | -40 °C to 85 °C | Available Through Authorized Allegro Distributors Only |
Contact Local Sales Representative or check distributor stock |
|
| A1220ELHLX-T | 3-lead SOT | Yes | view data | -40 °C to 85 °C | new |
Contact Local Sales Representative or check distributor stock |
|
| A1220EUA-T | 3-pin SIP | Yes | view data | -40 °C to 85 °C | new |
Contact Local Sales Representative or check distributor stock |
|
| A1220LLHLT-T | 3-lead SOT | Yes | view data | -40 °C to 150 °C | Available Through Authorized Allegro Distributors Only |
Contact Local Sales Representative or check distributor stock |
|
| A1220LLHLX-T | 3-lead SOT | Yes | view data | -40 °C to 150 °C | new |
Contact Local Sales Representative or check distributor stock |
|
| A1220LUA-T | 3-pin SIP | Yes | view data | -40 °C to 150 °C | new |
Contact Local Sales Representative or check distributor stock |
|
| A1221ELHLT-T | 3-lead SOT | Yes | view data | -40 °C to 85 °C | Available Through Authorized Allegro Distributors Only |
Contact Local Sales Representative or check distributor stock |
|
| A1221ELHLX-T | 3-lead SOT | Yes | view data | -40 °C to 85 °C | new |
Contact Local Sales Representative or check distributor stock |
|
| A1221EUA-T | 3-pin SIP | Yes | view data | -40 °C to 85 °C | new |
Contact Local Sales Representative or check distributor stock |
|
| A1221LLHLT-T | 3-lead SOT | Yes | view data | -40 °C to 150 °C | Available Through Authorized Allegro Distributors Only |
Contact Local Sales Representative or check distributor stock |
|
| A1221LLHLX-T | 3-lead SOT | Yes | view data | -40 °C to 150 °C | new |
Contact Local Sales Representative or check distributor stock |
|
| A1221LUA-T | 3-pin SIP | Yes | view data | -40 °C to 150 °C | new |
Contact Local Sales Representative or check distributor stock |
|
| A1222ELHLT-T | 3-lead SOT | Yes | view data | -40 °C to 85 °C | new |
Contact Local Sales Representative or check distributor stock |
|
| A1222ELHLX-T | 3-lead SOT | Yes | view data | -40 °C to 85 °C | Available Through Authorized Allegro Distributors Only new |
Contact Local Sales Representative or check distributor stock |
|
| A1222LLHLT-T | 3-lead SOT | Yes | view data | -40 °C to 150 °C | new |
Contact Local Sales Representative or check distributor stock |
|
| A1222LLHLX-T | 3-lead SOT | Yes | view data | -40 °C to 150 °C | Available Through Authorized Allegro Distributors Only new |
Contact Local Sales Representative or check distributor stock |
|
| A1222LUA-T | 3-pin SIP | Yes | view data | -40 °C to 150 °C | new |
Contact Local Sales Representative or check distributor stock |
|
| A1223ELHLT-T | 3-lead SOT | Yes | view data | -40 °C to 85 °C | new |
Contact Local Sales Representative or check distributor stock |
|
| A1223ELHLX-T | 3-lead SOT | Yes | view data | -40 °C to 85 °C | Available Through Authorized Allegro Distributors Only new |
Contact Local Sales Representative or check distributor stock |
|
| A1223LLHLT-T | 3-lead SOT | Yes | view data | -40 °C to 150 °C | new |
Contact Local Sales Representative or check distributor stock |
|
| A1223LLHLX-T | 3-lead SOT | Yes | view data | -40 °C to 150 °C | Available Through Authorized Allegro Distributors Only new |
Contact Local Sales Representative or check distributor stock |
|
| A1223LUA-T | 3-pin SIP | Yes | view data | -40 °C to 150 °C | new |
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.