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Allegro MicroSystems A1322EUA-T
- Part No.:
- A1322EUA-T
- Manufacturer:
- Allegro MicroSystems
- Category:
- Linear, Compass (ICs)
- Package:
- 3-SSIP
- Datasheet:
-
A1322EUA-T.pdf
- Description:
- SENSOR HALL EFFECT ANALOG 3SIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,150
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Product details
Overview
A1322EUA-T from Allegro MicroSystems is a ratiometric linear Hall-effect sensor IC optimized for high-temperature automotive and industrial position sensing. It delivers 3.125 mV/G sensitivity, rail-to-rail output (0.2 V to 4.7 V), quiescent output voltage of 2.5 V at 5 V supply, operates from –40 °C to 85 °C ambient, and features dynamic offset cancellation for stable DC output in harsh environments.
For engineers reviewing the A1322EUA-T datasheet, A1322EUA-T pinout, A1322EUA-T application, or A1322EUA-T equivalent, this page provides verified technical context, real-world design meaning for key specs, validated pin functions, application-specific use cases, and two confirmed alternative parts with documented functional and application differences.
Technical Context
The A1322EUA-T integrates a BiCMOS monolithic circuit with Hall element, temperature-compensating circuitry, high-gain amplifier, and rail-to-rail low-impedance output stage. Its proprietary dynamic offset cancellation uses a 150 kHz internal clock to suppress residual offset caused by overmolding and thermal stress.
It implements ratiometric operation: both quiescent output voltage and sensitivity scale linearly with supply voltage (4.5–5.5 V). Output precision is achieved via end-of-line gain and offset trim, delivering ±1.5% linearity and ±1.5% symmetry over temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Sensitivity | 3.125 mV/G typical - enables precise detection of small magnetic field changes in rotary or linear position systems |
| Quiescent Output Voltage | 2.5 V at 5 V supply - stable mid-rail reference unaffected by supply variation due to ratiometric design |
| Output Range | 0.2 V to 4.7 V - full rail-to-rail swing supports robust analog interfacing without external level-shifting |
| Supply Voltage | 4.5–5.5 V - compatible with standard 5 V automotive and industrial power rails |
| Operating Temperature | –40 °C to 85 °C - qualified for under-hood and factory-floor environments |
| Output Noise (pk-pk) | 25 mV - low-noise performance suitable for high-resolution analog signal chains |
| Bandwidth | 30 kHz - supports fast response in motor commutation and speed-sensing applications |
Pinout & Package
Package: 3-pin SIP (Single In-line Package), lead-free, matte tin plated leadframe (suffix -T).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 1) | Power supply input | Accepts 4.5–5.5 V; includes internal Zener clamp (6–8.3 V) for transient protection |
| GND (Pin 2) | Ground reference | Return path for supply current and output load; critical for noise immunity and offset stability |
| VOUT (Pin 3) | Analog output | Rail-to-rail voltage proportional to magnetic flux density; drives ≥4.7 kΩ loads directly |
Key Features
| Feature | Design Value |
|---|---|
| Dynamic offset cancellation | 150 kHz internal clock eliminates mechanical stress-induced drift and improves recoverability after thermal cycling |
| Ratiometric output | Both VOUT(Q) and sensitivity track VCC, removing need for precision voltage references in supply-varying systems |
| Temperature-stable quiescent voltage | ±10 G equivalent drift over –40 °C to 85 °C ensures consistent zero-field baseline across operating range |
| Robust EMC protection | Integrated filtering and BiCMOS architecture provide immunity to radiated and conducted noise in automotive ECU environments |
| High-temperature reliability | Qualified to 150 °C junction temperature with 165 °C max rating - supports extended life in sealed enclosures |
Applications
| Throttle Position Sensing | Brake Pedal Position Sensing |
|---|---|
Use Scenario: Detect angular displacement of throttle plate or brake pedal lever using magnet attached to rotating shaft. IC Role / Device Role / Timing Role: Linear Hall-effect sensor providing analog voltage output proportional to magnet angle and field strength. Use Value: Delivers 3.125 mV/G sensitivity and ±1.5% linearity to enable sub-degree angular resolution without calibration. | Use Scenario: Monitor brake pedal travel in hydraulic or electronic braking systems for pedal feel feedback and ABS activation logic. IC Role / Device Role / Timing Role: Ratiometric analog sensor interfacing directly to 10-bit or 12-bit ADC in vehicle controller. Use Value: Stable 2.5 V quiescent output and rail-to-rail swing ensure full ADC utilization across 4.5–5.5 V supply variations. |
| Seat Position Adjustment | Industrial Linear Actuator Feedback |
Use Scenario: Measure seat track extension in automotive power seats using side-mounted magnet and fixed sensor. IC Role / Device Role / Timing Role: High-reliability analog position transducer operating continuously in cabin temperature gradients. Use Value: Immunity to mechanical stress and ±2% sensitivity drift after temperature cycling ensure long-term repeatability. | Use Scenario: Provide closed-loop position feedback for electric linear actuators in packaging machinery or valve control systems. IC Role / Device Role / Timing Role: Analog sensor mounted on actuator housing detecting magnet movement along stroke axis. Use Value: 30 kHz bandwidth and low 25 mV peak-to-peak noise support accurate velocity estimation and smooth motion control. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar linear Hall-effect sensor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| A1325LUA-T | Same package and pinout; higher temperature grade (–40 °C to 150 °C ambient); identical 3.125 mV/G sensitivity | Supports under-hood applications requiring extended ambient range; not required for cabin or controlled-environment use | Select A1325LUA-T only when operation above 85 °C ambient is mandated; otherwise A1322EUA-T remains optimal for cost and availability |
| ACS712ELCTR-05B-T | Current sensor (not position sensor); 5 A range; 185 mV/A output; bidirectional; SOIC-8 package | Designed for current measurement in motor drivers or power supplies-not a drop-in replacement for magnetic position sensing | Choose only if application requires current monitoring instead of position; incompatible pinout, function, and interface |
Compared with A1322EUA-T, A1325LUA-T offers identical electrical behavior but extends ambient operation to 150 °C-valuable for engine bay placement-while ACS712ELCTR-05B-T serves an entirely different sensing modality (current vs. field) and cannot substitute in position-sensing circuits.
Availability
A1322EUA-T is available at Aetrix Electronics and suitable for throttle position sensing, brake pedal monitoring, seat adjustment systems, and industrial linear actuator feedback requiring stable component supply despite its discontinued status for new designs.
Supply support for A1322EUA-T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Allegro MicroSystems is a U.S.-based designer and manufacturer of high-performance magnetic sensing and power ICs, specializing in automotive-grade analog and mixed-signal solutions.
The A132X family was developed specifically for high-temperature, high-reliability linear and rotary position sensing in automotive powertrain and chassis systems, emphasizing ratiometric stability and mechanical stress immunity.
FAQ
Is the A1322EUA-T still available for purchase?
Yes, A1322EUA-T is available through Aetrix Electronics for legacy and continuity support. Although Allegro has classified it as "NOT FOR NEW DESIGN" with no samples available, we maintain traceable inventory for existing production programs and repair applications requiring exact form-fit-function replacement.
What is the maximum operating temperature of the A1322EUA-T?
The A1322EUA-T is rated for ambient temperatures from –40 °C to +85 °C. Its junction temperature can reach up to 165 °C, and thermal derating curves confirm reliable operation within this ambient range when mounted on standard 1-layer PCBs with RθJA = 165 °C/W.
Does the A1322EUA-T require an external bypass capacitor?
Yes, the A1322EUA-T requires a 0.1 μF ceramic bypass capacitor between VCC and GND, placed as close as possible to the device pins. This capacitor stabilizes the supply and reduces noise-critical for achieving the specified 25 mV peak-to-peak output noise performance.
Can the A1322EUA-T be used in safety-critical automotive systems?
No-the A1322EUA-T is not ASIL-certified and Allegro explicitly prohibits use in life support devices or systems where failure could affect safety or effectiveness. For safety-critical applications, consider ASIL-B or ASIL-D qualified successors such as the A1325LUA-T with appropriate system-level fault handling.
What is the output impedance of the A1322EUA-T?
The A1322EUA-T has a nominal output resistance of 1.5 Ω (max 3 Ω), enabling direct drive of loads ≥4.7 kΩ. Its low-impedance rail-to-rail output stage eliminates need for external buffer amplifiers in most microcontroller ADC interfacing scenarios.
A1322EUA-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- 3-SSIP
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Technology:
- Hall Effect
- Axis:
- Single
- Output Type:
- Analog Voltage
- Sensing Range:
- -
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Supply (Max):
- 8mA
- Current - Output (Max):
- 10mA
- Resolution:
- -
- Bandwidth:
- 30kHz
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Features:
- Temperature Compensated
- Supplier Device Package:
- 3-SIP
- Mounting Type:
- Through Hole
A1322EUA-T FAQ
1.How can I place an order for A1322EUA-T through Aetrix?
Please submit a Request for Quotation (RFQ) for A1322EUA-T on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for A1322EUA-T reliable?
The price and inventory of A1322EUA-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A1322EUA-T is usually 5 days.
3.What payment methods are accepted for A1322EUA-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A1322EUA-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A1322EUA-T?
A1322EUA-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A1322EUA-T order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for A1322EUA-T?
For technical support, including A1322EUA-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A1322EUA-T requirements.
6.How does Aetrix verify that A1322EUA-T is sourced from the original manufacturer or authorized distributors?
All A1322EUA-T products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that A1322EUA-T meets industry standards.
7.What is the process for return or replacement of A1322EUA-T?
All A1322EUA-T units undergo pre-shipment inspection (PSI). If there is an issue with A1322EUA-T, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The A1322EUA-T part is unused and in its original packaging.
Return procedure for A1322EUA-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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