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Allegro MicroSystems A1321EUA-T
- Part No.:
- A1321EUA-T
- Manufacturer:
- Allegro MicroSystems
- Category:
- Linear, Compass (ICs)
- Package:
- 3-SSIP
- Datasheet:
-
A1321EUA-T.pdf
- Description:
- SENSOR HALL EFFECT ANALOG 3SIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,013
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Product details
Overview
A1321EUA-T from Allegro MicroSystems is a ratiometric linear Hall-effect sensor IC in a 3-pin SIP package, delivering 5.000 mV/G sensitivity, 50% VCC quiescent output voltage, and rail-to-rail analog output across –40 °C to +85 °C ambient. It integrates dynamic offset cancellation, BiCMOS signal conditioning, and robust EMC protection for automotive throttle position and industrial rotary encoder feedback.
For engineers reviewing the A1321EUA-T datasheet, A1321EUA-T pinout, A1321EUA-T application, or A1321EUA-T equivalent, this page delivers verified electrical specs, thermal derating guidance, true pin mapping, and two validated alternative parts for legacy design continuity and obsolescence mitigation.
Technical Context
The A1321EUA-T employs a proprietary high-frequency (150 kHz) dynamic offset cancellation technique that eliminates residual voltage drift from mechanical stress and temperature cycling, enabling ±10 G equivalent accuracy over temperature. Its monolithic BiCMOS architecture integrates Hall element, gain/offset trim circuitry, and rail-to-rail output stage on a single die.
This device operates ratiometrically: both quiescent output voltage and sensitivity scale linearly with supply voltage (4.5–5.5 V), ensuring stable performance under varying power conditions. Output bandwidth is 30 kHz, supporting fast-response position sensing in motor control and brake pedal applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Sensitivity | 5.000 mV/G typical - enables precise magnetic field resolution down to ±0.2 G at 1 mV noise floor |
| Quiescent Output Voltage | 2.5 V ±75 mV at 5 V supply - provides centered analog reference for bidirectional field detection |
| Supply Voltage Range | 4.5–5.5 V - compatible with standard 5 V automotive and industrial rails without regulation |
| Output Bandwidth | 30 kHz - supports real-time position tracking up to 300 Hz mechanical rotation |
| Operating Temperature | –40 °C to +85 °C - qualified for under-hood and factory automation environments |
| Supply Current | 5.6–8 mA - low power draw suitable for always-on sensing nodes |
| Output Noise (pk-pk) | 40 mV - defines minimum detectable field change (~8 G) without external filtering |
Pinout & Package
Package: 3-pin Single In-Line Package (SIP), lead-free matte tin plating, through-hole mounting. Dimensions: 15.75 mm × 3.02 mm × 4.09 mm (L×W×H).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 1) | Positive supply input | Accepts 4.5–5.5 V; internal Zener clamp activates above 8 V for transient protection |
| GND (Pin 2) | Reference ground | Return path for supply current and output load; must be low-impedance for noise immunity |
| VOUT (Pin 3) | Analog output terminal | Rail-to-rail voltage proportional to magnetic flux density; drives ≥4.7 kΩ load directly |
Key Features
| Feature | Design Value |
|---|---|
| Dynamic Offset Cancellation | 150 kHz clock-driven trimming eliminates thermal and stress-induced zero-point drift, enabling ±10 G accuracy over full temperature range |
| Ratiometric Output | Both VOUT(q) and sensitivity track VCC within ±1.5%, removing need for precision voltage references in host systems |
| High-Temperature Stability | ΔSens(ΔT) ≤ ±7.5% over –40 °C to +85 °C - maintains linearity without external compensation |
| Robust EMC Protection | Integrated filtering and layout-optimized die design meet ISO 11452-2/4 for automotive EMI immunity |
| End-of-Line Trim | Factory-adjusted gain and offset ensure 5.000 mV/G sensitivity and 2.5 V quiescent output without user calibration |
Applications
| Automotive Throttle Position Sensing | Industrial Rotary Encoder Feedback |
|---|---|
Use Scenario: Detect angular position of engine throttle plate via magnet mounted on shaft. IC Role / Device Role / Timing Role: Linear Hall-effect sensor providing analog voltage proportional to magnet angle. Use Value: 5.000 mV/G sensitivity and ±1.5% ratiometry enable direct ADC interface without scaling, reducing BOM cost. |
Use Scenario: Monitor rotational position of motor shaft in CNC machine tool. IC Role / Device Role / Timing Role: Analog position transducer feeding closed-loop servo controller. Use Value: 30 kHz bandwidth and rail-to-rail output support 300 Hz position update rate with <1 µs latency. |
| Brake Pedal Position Monitoring | Linear Actuator Stroke Detection |
Use Scenario: Measure displacement of vehicle brake pedal using back-biased magnet. IC Role / Device Role / Timing Role: Bidirectional field sensor converting pedal travel into voltage ramp. Use Value: 2.5 V quiescent point and ±10 G equivalent accuracy allow ±20 mm stroke measurement with 0.2 mm resolution. |
Use Scenario: Sense extension length of hydraulic actuator in agricultural equipment. IC Role / Device Role / Timing Role: Contactless linear displacement sensor replacing potentiometers. Use Value: Solid-state reliability and immunity to dust/moisture eliminate maintenance vs. mechanical sensors. |
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 |
|---|---|---|---|
| A1324LUA-T | Same SIP package, identical pinout, but rated for –40 °C to +150 °C and 5.000 mV/G sensitivity; includes enhanced high-temp offset stability. | Supports under-hood applications beyond A1321EUA-T's 85 °C limit; requires no PCB changes. | Select when new designs require extended temperature operation or long-term obsolescence resilience. |
| APS12605KUA-T | Pin-compatible SIP replacement with 5.0 mV/G sensitivity, integrated EEPROM for programmable offset/gain, and AEC-Q100 Grade 0 qualification. | Enables field calibration and tighter tolerance tuning; certified for safety-critical automotive subsystems. | Choose for ASIL-B–capable systems requiring programmability and extended qualification. |
Compared with A1321EUA-T, the A1324LUA-T extends ambient range to 150 °C while preserving pinout and sensitivity, whereas APS12605KUA-T adds programmability and safety certification at the cost of higher unit price and EEPROM configuration overhead.
Availability
A1321EUA-T is available at Aetrix Electronics and suitable for automotive throttle sensing, industrial encoder feedback, and brake pedal monitoring requiring stable component supply despite end-of-life status.
Supply support for A1321EUA-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 semiconductor company specializing in magnetic sensing, power ICs, and motor driver solutions for automotive and industrial markets.
The A132X family was designed specifically for high-reliability linear and rotary position sensing in harsh environments, emphasizing temperature stability, ratiometric accuracy, and solid-state durability over mechanical alternatives.
FAQ
Is the A1321EUA-T still in production?
No, the A1321EUA-T is discontinued and not recommended for new designs. Allegro declared it NOT FOR NEW DESIGN effective January 31, 2011, with no samples available. Aetrix Electronics maintains limited legacy stock for existing customer continuity, subject to availability and last-time-buy terms.
What is the exact pinout of the A1321EUA-T?
The A1321EUA-T uses a 3-pin SIP package with Pin 1 = VCC, Pin 2 = GND, and Pin 3 = VOUT. This matches the UA package drawing in the A1321-DS Rev. 23 datasheet and is electrically identical to A1324LUA-T for drop-in replacement where temperature range permits.
Can the A1321EUA-T operate from a 3.3 V supply?
No, the A1321EUA-T requires 4.5–5.5 V supply per its Absolute Maximum Ratings and Electrical Characteristics tables. Operation below 4.5 V risks undefined output behavior, reduced sensitivity, and failure to meet specified quiescent voltage or linearity.
What does "ratiometric" mean for the A1321EUA-T?
For the A1321EUA-T, ratiometric means both its quiescent output voltage (2.5 V nominal) and sensitivity (5.000 mV/G) scale linearly with supply voltage - e.g., at 4.5 V supply, VOUT(q) ≈ 2.25 V and sensitivity ≈ 4.5 mV/G - eliminating need for independent voltage references in host systems.
How does the A1321EUA-T handle temperature-induced drift?
The A1321EUA-T uses on-chip temperature-compensating circuitry and dynamic offset cancellation to limit quiescent voltage drift to ±10 G equivalent and sensitivity drift to ±1.5% over supply voltage and ±7.5% over temperature, ensuring stable analog output without external calibration across its –40 °C to +85 °C range.
A1321EUA-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
A1321EUA-T FAQ
1.How can I place an order for A1321EUA-T through Aetrix?
Please submit a Request for Quotation (RFQ) for A1321EUA-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 A1321EUA-T reliable?
The price and inventory of A1321EUA-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A1321EUA-T is usually 5 days.
3.What payment methods are accepted for A1321EUA-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A1321EUA-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A1321EUA-T?
A1321EUA-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A1321EUA-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 A1321EUA-T?
For technical support, including A1321EUA-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A1321EUA-T requirements.
6.How does Aetrix verify that A1321EUA-T is sourced from the original manufacturer or authorized distributors?
All A1321EUA-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 A1321EUA-T meets industry standards.
7.What is the process for return or replacement of A1321EUA-T?
All A1321EUA-T units undergo pre-shipment inspection (PSI). If there is an issue with A1321EUA-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 A1321EUA-T part is unused and in its original packaging.
Return procedure for A1321EUA-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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