My Inquiry
My Account
Allegro MicroSystems A1321LUA-T
- Part No.:
- A1321LUA-T
- Manufacturer:
- Allegro MicroSystems
- Category:
- Linear, Compass (ICs)
- Package:
- 3-SSIP
- Datasheet:
-
A1321LUA-T.pdf
- Description:
- SENSOR HALL EFFECT ANALOG 3SIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,516
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
A1321LUA-T from Allegro MicroSystems is a ratiometric linear Hall-effect sensor IC in a 3-pin SIP (Single In-line Package) for high-temperature automotive and industrial position sensing. It delivers 5.0 mV/G sensitivity, 50% VCC quiescent output voltage, ±10 G magnetic accuracy over –40 °C to +150 °C, and rail-to-rail analog output - used in throttle pedal and brake position feedback systems.
For engineers reviewing the A1321LUA-T datasheet, A1321LUA-T pinout, A1321LUA-T application, or A1321LUA-T equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, application-specific implementation value, and two confirmed alternative parts with functional and thermal trade-offs.
Technical Context
The A1321LUA-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 from mechanical stress and thermal drift.
It operates ratiometrically: both quiescent output voltage and sensitivity scale linearly with supply voltage (4.5–5.5 V), enabling direct interface with ADCs without external reference. Output bandwidth is 30 kHz, supporting fast-response position tracking in rotating machinery and actuator control loops.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Sensitivity | 5.0 mV/G typical - enables precise detection of small magnetic field changes in linear displacement applications |
| Quiescent Output Voltage | 2.5 V at 5 V supply - stable mid-rail bias simplifies analog signal conditioning and reduces common-mode error |
| Operating Temperature | –40 °C to +150 °C - qualified for under-hood automotive environments and industrial motor enclosures |
| Supply Voltage Range | 4.5–5.5 V - compatible with standard 5 V regulated rails and tolerant of automotive battery transients |
| Output Bandwidth | 30 kHz - supports real-time monitoring of rapidly varying position signals up to ~300 Hz mechanical motion |
| Output Impedance | 1.5 Ω typical - drives 4.7 kΩ loads with minimal signal attenuation and settling delay |
| Noise (p-p) | 40 mV - defines minimum resolvable field change (~8 G) in unfiltered DC-coupled configurations |
Pinout & Package
Package: 3-pin Single In-line Package (SIP), lead-free, matte tin plated leadframe, through-hole mounting.
| 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 sink/source; must be low-impedance for noise immunity |
| VOUT (Pin 3) | Analog output | Ratiometric rail-to-rail voltage proportional to magnetic flux density; drives ≥4.7 kΩ loads |
Key Features
| Feature | Design Value |
|---|---|
| Dynamic offset cancellation | 150 kHz clock eliminates thermal and mechanical drift - ensures <±10 G total error over full temperature range |
| Ratiometric output | Quiescent voltage and sensitivity track VCC - removes need for precision voltage reference in ADC interfaces |
| High-temperature stability | ΔSens ≤ ±7.5% from hot-to-room cycling - maintains calibration integrity in engine bay deployments |
| Robust EMC protection | Integrated filtering and layout-optimized die - meets automotive-level radiated and conducted immunity requirements |
| BiCMOS monolithic integration | Hall element + amplifier on single die - minimizes parasitic coupling and improves signal-to-noise ratio vs discrete solutions |
Applications
| Throttle Position Sensing | Brake Pedal Position Sensing |
|---|---|
Use Scenario: Measures angular displacement of accelerator pedal linkage via magnet attached to rotating lever arm. IC Role / Device Role / Timing Role: Linear Hall-effect sensor providing analog voltage output proportional to pedal angle. Use Value: 5.0 mV/G sensitivity and ±10 G accuracy enable sub-degree resolution over full travel; ratiometric operation ensures consistent response across battery voltage fluctuations. | Use Scenario: Detects linear travel of hydraulic brake master cylinder pushrod using back-biased magnet. IC Role / Device Role / Timing Role: High-temperature-stable analog position transducer interfacing directly to vehicle ECU ADC. Use Value: –40 °C to +150 °C operation supports under-hood placement; rail-to-rail output maximizes ADC dynamic range utilization. |
| Rotary Valve Position Feedback | Industrial Motor Commutation |
Use Scenario: Monitors rotation angle of pneumatic control valve shaft in oil & gas process equipment. IC Role / Device Role / Timing Role: Contactless linear position sensor mounted adjacent to rotating magnet on valve stem. Use Value: Solid-state reliability and immunity to mechanical stress eliminate wear-out failure modes seen in potentiometers; 30 kHz bandwidth captures rapid valve adjustments. | Use Scenario: Provides commutation timing signal for BLDC motor stator windings in HVAC blowers and pumps. IC Role / Device Role / Timing Role: Analog Hall sensor feeding closed-loop controller with rotor position feedback. Use Value: Precise recoverability after temperature cycling ensures consistent zero-crossing detection across thermal cycles; low output impedance drives controller inputs without buffering. |
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 package, same pinout, 5.0 mV/G sensitivity, but rated for –40 °C to +150 °C with improved ΔSens(TAmax) ≤ ±5% | Direct replacement for new designs; supersedes A1321LUA-T per Allegro's discontinuation notice | Select when designing new systems requiring long-term supply continuity and tighter high-temp sensitivity stability. |
| ACS724LLCTR-10AU-T | Current sensor IC (not Hall-position), SOIC-8, 10 A range, 400 mV/A output, integrated conductor - no magnetic assembly required | Replaces position-sensing function only where current correlates to mechanical load (e.g., motor torque proxy) | Choose only if system architecture permits current-based inference instead of direct position measurement; not pin-compatible or functionally equivalent. |
Compared with A1321LUA-T, A1324LUA-T offers identical form-factor and electrical interface with enhanced high-temperature sensitivity stability, while ACS724LLCTR-10AU-T shifts sensing modality from position to current - requiring redesign of magnetic coupling and signal interpretation logic.
Availability
A1321LUA-T is available at Aetrix Electronics and suitable for automotive throttle control, brake position monitoring, rotary valve feedback, and industrial motor commutation requiring stable component supply despite end-of-life status.
Supply support for A1321LUA-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 and power ICs for automotive and industrial markets.
The A132X family was designed specifically for high-reliability linear and rotary position sensing in harsh thermal environments - targeting under-hood automotive subsystems and factory automation equipment.
FAQ
What is the operating temperature range of the A1321LUA-T?
The A1321LUA-T is specified for ambient operation from –40 °C to +150 °C. This rating is validated per its UA package thermal resistance (RθJA = 165 °C/W) and maximum junction temperature of 165 °C. The device maintains ratiometric performance and ±10 G magnetic accuracy across this full range, making it suitable for engine compartment and industrial motor applications where thermal cycling is severe.
Is the A1321LUA-T still in production?
No - the A1321LUA-T is a discontinued product. Allegro MicroSystems declared it NOT FOR NEW DESIGN as of January 31, 2011, with samples no longer available. While Aetrix Electronics maintains legacy inventory, new designs should migrate to the recommended replacement A1324LUA-T, which shares the same SIP package and pinout but offers improved high-temperature stability.
What is the sensitivity and output behavior of the A1321LUA-T?
The A1321LUA-T has a typical sensitivity of 5.0 mV/G and a ratiometric quiescent output voltage of 50% of VCC. With 5 V supply, VOUT rests at 2.5 V with zero magnetic field; a +100 G field raises output to ~4.7 V, while –100 G lowers it to ~0.2 V. This rail-to-rail analog output scales linearly with supply voltage, eliminating need for external references in ADC interfacing - a core design feature of the A1321LUA-T.
How does the A1321LUA-T handle mechanical stress and thermal drift?
The A1321LUA-T employs a proprietary dynamic offset cancellation technique using a 150 kHz internal clock to continuously nullify residual offset caused by overmolding, thermal gradients, and mechanical strain. This results in <±10 G total error over temperature and ensures precise recoverability after thermal cycling - critical for position sensors in automotive throttle bodies and industrial actuators where long-term calibration stability is mandatory.
What package type and pin configuration does the A1321LUA-T use?
The A1321LUA-T uses a 3-pin Single In-line Package (SIP), designated by suffix "UA". Pin 1 is VCC, Pin 2 is GND, and Pin 3 is VOUT. The package is through-hole mountable, lead-free, and features 100% matte tin plating. Its pinout matches the A1324LUA-T, enabling drop-in replacement in existing PCB layouts where mechanical and thermal constraints permit.
A1321LUA-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 ~ 150°C
- Grade:
- -
- Qualification:
- -
- Features:
- Temperature Compensated
- Supplier Device Package:
- 3-SIP
- Mounting Type:
- Through Hole
A1321LUA-T FAQ
1.How can I place an order for A1321LUA-T through Aetrix?
Please submit a Request for Quotation (RFQ) for A1321LUA-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 A1321LUA-T reliable?
The price and inventory of A1321LUA-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A1321LUA-T is usually 5 days.
3.What payment methods are accepted for A1321LUA-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A1321LUA-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A1321LUA-T?
A1321LUA-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A1321LUA-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 A1321LUA-T?
For technical support, including A1321LUA-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A1321LUA-T requirements.
6.How does Aetrix verify that A1321LUA-T is sourced from the original manufacturer or authorized distributors?
All A1321LUA-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 A1321LUA-T meets industry standards.
7.What is the process for return or replacement of A1321LUA-T?
All A1321LUA-T units undergo pre-shipment inspection (PSI). If there is an issue with A1321LUA-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 A1321LUA-T part is unused and in its original packaging.
Return procedure for A1321LUA-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
A1321LUA-T Tags
-
DRV5053VAQDBZR
Texas Instruments
-
MMC5603NJ
Memsic Inc.
-
DRV5055A1QDBZR
Texas Instruments
-
MLX90392ELQ-AAA-011-RE
Melexis Technologies NV
-
CT100LW-HS6
Allegro MicroSystems
-
DRV5056A1ELPGMQ1
Texas Instruments
-
A1304ELHLX-T
Allegro MicroSystems
-
MMC5633NJL
Memsic Inc.
-
A1308KUA-2-T
Allegro MicroSystems
-
A1308KUA-1-T
Allegro MicroSystems
-
SI7210-B-04-IVR
Silicon Labs
-
A1308LLHLT-2-T
Allegro MicroSystems
Tech Hub
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
