Site
Map • Contact
Us 中文 • English
Related Links:
Datasheets:
A1120, A1121, A1122, and A1125: Chopper Stabilized Precision Hall Effect Switches (PDF)
Selection Guides:
Hall-Effect Sensor ICs,
Unipolar Hall-Effect Digital Switches
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
- Home
- / Products
- / Part Numbers
- / A1120 and A1125
- / Part Numbers
- / Products
A1120, A1121, A1122, and A1125
Chopper-Stabilized Precision Hall Effect Switches
Features and Benefits
- Unipolar switchpoints
- Resistant to physical stress
- Superior temperature stability
- Output short-circuit protection
- Operation from unregulated supply
- Reverse battery protection
- Solid-state reliability
- Small package sizes
Description
The A1120, A1121, A1122, and A1125 Hall-effect, unipolar switches are extremely temperature-stable and stress-resistant sensor ICs, 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.
An on-board 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.
For the A1120, A1121, and A1122, a south pole of sufficient strength turns the output on. Removal of the magnetic field turns the output off. The A1125 is complementary, in that for these devices, a south pole turns the A1125 output off, and removal of the magnetic field turns the output on.
Two package styles provide a magnetically optimized package for most applications. Package type LH is a modified SOT23W, surface mount package, while UA is a three-lead ultra-mini SIP for through-hole mounting. Each package type is lead (Pb) free (suffix, –T), with a 100% matte tin plated leadframe.
Functional Block Diagram
| Part Number | Package Type | RoHS Compliant |
Part Composition/ RoHS Data |
Temperature | Comments | Samples | Distributor Stock |
|---|---|---|---|---|---|---|---|
| A1120ELHLT-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 |
|
| A1120ELHLX-T | 3-lead SOT | Yes | view data | -40 °C to 85 °C | new |
Contact Local Sales Representative or check distributor stock |
|
| A1120EUA-T | 3-pin SIP | Yes | view data | -40 °C to 85 °C | new |
Contact Local Sales Representative or check distributor stock |
|
| A1120LLHLT-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 |
|
| A1120LLHLX-T | 3-lead SOT | Yes | view data | -40 °C to 150 °C | new |
Contact Local Sales Representative or check distributor stock |
|
| A1120LUA-T | 3-pin SIP | Yes | view data | -40 °C to 150 °C | new |
Contact Local Sales Representative or check distributor stock |
|
| A1121ELHLT-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 |
|
| A1121ELHLX-T | 3-lead SOT | Yes | view data | -40 °C to 85 °C | new |
Contact Local Sales Representative or check distributor stock |
|
| A1121EUA-T | 3-pin SIP | Yes | view data | -40 °C to 85 °C | new |
Contact Local Sales Representative or check distributor stock |
|
| A1121LLHLT-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 |
|
| A1121LLHLX-T | 3-lead SOT | Yes | view data | -40 °C to 150 °C | new |
Contact Local Sales Representative or check distributor stock |
|
| A1121LUA-T | 3-pin SIP | Yes | view data | -40 °C to 150 °C | new |
Contact Local Sales Representative or check distributor stock |
|
| A1122ELHLT-T | 3-lead SOT | -- | -- | -40 °C to 85 °C | Available Through Authorized Allegro Distributors Only new |
Contact Local Sales Representative or check distributor stock |
|
| A1122ELHLX-T | 3-lead SOT | Yes | view data | -40 °C to 85 °C | new |
Contact Local Sales Representative or check distributor stock |
|
| A1122EUA-T | 3-pin SIP | Yes | view data | -40 °C to 85 °C | new |
Contact Local Sales Representative or check distributor stock |
|
| A1122LLHLT-T | 3-lead SOT | -- | -- | -40 °C to 150 °C | Available Through Authorized Allegro Distributors Only new |
Contact Local Sales Representative or check distributor stock |
|
| A1122LLHLX-T | 3-lead SOT | Yes | view data | -40 °C to 150 °C | new |
Contact Local Sales Representative or check distributor stock |
|
| A1122LUA-T | 3-pin SIP | Yes | view data | -40 °C to 150 °C | new |
Contact Local Sales Representative or check distributor stock |
|
| A1125ELHLX-T | 3-lead SOT | -- | -- | -40 °C to 85 °C | new |
Contact Local Sales Representative or check distributor stock |
|
| A1125EUA-T | 3-pin SIP | Yes | view data | -40 °C to 85 °C | new |
Contact Local Sales Representative or check distributor stock |
|
| A1125LLHLX-T | 3-lead SOT | -- | -- | -40 °C to 150 °C | new |
Contact Local Sales Representative or check distributor stock |
|
| A1125LUA-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.