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Allegro MicroSystems A1302KUA-T
- Part No.:
- A1302KUA-T
- Manufacturer:
- Allegro MicroSystems
- Category:
- Linear, Compass (ICs)
- Package:
- 3-SSIP
- Datasheet:
-
A1302KUA-T.pdf
- Description:
- SENSOR HALL EFFECT ANALOG 3SIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,604
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Product details
Overview
A1302KUA-T from Allegro MicroSystems is a continuous-time, ratiometric, linear Hall-effect sensor IC optimized for accurate voltage output proportional to applied magnetic field strength. It features 1.3 mV/G typical sensitivity, –40°C to 125°C operating temperature range, and quiescent output voltage at 50% of supply (2.5 V at 5 V). Used in industrial position sensing for rotational and linear motion detection.
For engineers reviewing the A1302KUA-T datasheet, A1302KUA-T pinout, A1302KUA-T application, or A1302KUA-T equivalent, this page delivers verified technical context, package-specific terminal mapping, real-world use cases, and validated alternative options for legacy design continuity and obsolescence mitigation.
Technical Context
The A1302KUA-T integrates a Hall element, linear amplifier, and CMOS Class A output stage on a single die, eliminating external signal conditioning for low-noise analog magnetic sensing. Its ratiometric architecture ensures both quiescent output voltage and magnetic sensitivity scale linearly with supply voltage (4.5–6.0 V), enabling stable operation across varying rail conditions.
Internal gain and offset trim adjustments are performed at end-of-line during manufacturing, delivering ±2.5% linearity and ±3.0% symmetry over temperature. The device achieves 20 kHz bandwidth and sub-5 μs power-on time, supporting dynamic motion sensing in high-reliability industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Sensitivity | 1.3 mV/G typical at 25°C - enables precise analog field measurement with minimal amplification stages |
| Operating Temperature | –40°C to 125°C - supports deployment in harsh industrial and under-hood automotive environments |
| Supply Voltage | 4.5–6.0 V - compatible with standard 5 V logic rails and tolerant of nominal supply variation |
| Output Bandwidth | 20 kHz - sufficient for real-time monitoring of rotating shafts up to ~120,000 RPM |
| Quiescent Output | 2.5 V ±0.2 V at 5 V supply - rail-to-rail ratiometric reference simplifies ADC interfacing |
| Power-On Time | 3–5 μs - enables rapid system wake-up and responsive feedback control loops |
| Output Noise | 150 μV rms (≤10 kHz filter) - low-noise performance reduces need for external filtering |
Pinout & Package
Package: 3-pin ultramini SIP (UA), through-hole mount, lead-free with 100% matte tin plating. Dimensions: 15.75 mm × 1.52 mm × 4.09 mm (L × W × H), branded face orientation defined per Allegro DWG-9049.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power supply input | Connects to 4.5–6.0 V rail; internal regulation not required |
| GND | Ground reference | Common return path for Hall element, amplifier, and output stage |
| VOUT | Analog voltage output | Ratiometric, rail-to-rail output directly interfaces with 10-bit+ ADCs without level-shifting |
Key Features
| Feature | Design Value |
|---|---|
| Ratiometric output | Both VOUTQ and sensitivity track VCC - eliminates calibration drift due to supply variation |
| Factory-trimmed gain/offset | End-of-line laser trimming ensures ±2.5% linearity and ±3.0% symmetry without user calibration |
| Low-noise analog output | 150 μV rms noise floor allows direct connection to precision ADCs (e.g., TI ADS1115, ADI AD779x) |
| Fast power-on response | 3–5 μs wake-up enables duty-cycled sensing to reduce average system power |
| Robust ESD protection | Qualified to >4 kV HBM - survives handling and board-level ESD events without shielding |
Applications
| Motor Commutation Feedback | Rotary Position Sensing |
|---|---|
|
Use Scenario: Detect rotor pole position in BLDC motors for electronic commutation. IC Role / Device Role / Timing Role: Analog magnetic field transducer providing continuous angular position feedback to MCU-based motor controller. Use Value: 1.3 mV/G sensitivity and 20 kHz bandwidth support precise timing of MOSFET gate drive signals at motor speeds up to 120,000 RPM. |
Use Scenario: Measure angular displacement of rotating shafts in industrial valves and actuators. IC Role / Device Role / Timing Role: Linear Hall sensor converting magnetic flux changes into proportional analog voltage for position reconstruction. Use Value: Ratiometric output maintains accuracy across 4.5–6.0 V supply variation common in 24 V DC systems with LDO dropout. |
| Linear Displacement Monitoring | Current Sensing (Indirect) |
|
Use Scenario: Track piston or slider position in hydraulic cylinders and pneumatic actuators. IC Role / Device Role / Timing Role: Fixed-position sensor detecting field strength change from moving ferrous target or magnet. Use Value: ±2.5% linearity and –40°C to 125°C operation ensure repeatable position reporting across full industrial thermal envelope. |
Use Scenario: Non-invasive current measurement via magnetic field around conductor (e.g., busbar). IC Role / Device Role / Timing Role: Field-to-voltage converter used with concentrator core to infer current magnitude. Use Value: Low 150 μV rms noise and rail-to-rail output enable resolution better than 0.5 A in 100 A systems using 12-bit ADC sampling. |
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 |
|---|---|---|---|
| Allegro A1324LLHLT-T | Higher sensitivity (5.0 mV/G), SOT-23W surface-mount package, same –40°C to 125°C rating | Requires PCB rework for SMT layout; unsuitable for through-hole legacy boards | Select when higher signal amplitude justifies SMT transition and board redesign |
| Melexis MLX90242ESE-GAA-000-RE | Programmable sensitivity (1.0–2.5 mV/G), 3-pin SIP package, 3.0–5.5 V supply, ±1.5% linearity | Supports field calibration and digital configuration via EEPROM; requires I²C interface for setup | Select when programmability and tighter linearity are needed, and firmware support for initialization exists |
Compared with A1302KUA-T, the A1324LLHLT-T offers higher sensitivity but mandates SMT assembly, while the MLX90242ESE-GAA-000-RE adds programmability and improved linearity at the cost of added configuration complexity and narrower supply range.
Availability
A1302KUA-T is available at Aetrix Electronics and suitable for industrial position sensing, motor feedback, and linear displacement monitoring requiring stable component supply amid legacy product lifecycle constraints.
Supply support for A1302KUA-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 of high-performance magnetic sensors and power ICs, headquartered in Worcester, Massachusetts, with global manufacturing and support infrastructure.
The A1302KUA-T belongs to Allegro's continuous-time linear Hall-effect sensor family, engineered for robust, low-drift analog position and motion sensing in extended-temperature industrial and automotive subsystems.
FAQ
What is the operating temperature range of the A1302KUA-T?
The A1302KUA-T operates from –40°C to 125°C, qualified for industrial and under-hood automotive environments. This range is confirmed by Allegro's K-grade qualification testing and reflected in the "Range K" designation in the Selection Guide. The A1302KUA-T maintains specified sensitivity (0.85–1.75 mV/G) and quiescent output (2.2–2.8 V) across this full span.
Is the A1302KUA-T pin-compatible with other Allegro Hall sensors in the UA package?
Yes - the A1302KUA-T shares identical 3-pin SIP (UA) pinout with A1301KUA-T, A1302EUA-T, and A1301EUA-T: Pin 1 = VCC, Pin 2 = GND, Pin 3 = VOUT. Mechanical dimensions and branding orientation also match per Allegro DWG-9049, enabling direct replacement on existing through-hole layouts.
What does the "K" and "T" suffix mean in A1302KUA-T?
In A1302KUA-T, "K" denotes the extended temperature grade (–40°C to 125°C), "UA" specifies the 3-pin ultramini SIP package, and "T" indicates lead-free construction with 100% matte tin plating. This matches Allegro's official suffix convention documented in the Selection Guide and Package Drawings.
Can the A1302KUA-T be used with a 3.3 V supply?
No - the A1302KUA-T requires 4.5–6.0 V supply per Absolute Maximum Ratings and Electrical Characteristics tables. Operation below 4.5 V risks undefined output behavior, reduced sensitivity, and failure to meet ratiometric specification. A 3.3 V system requires a level-shifted supply or alternative sensor such as Melexis MLX90363.
Does the A1302KUA-T require external bypass capacitors?
Yes - Allegro recommends a 0.1 μF ceramic capacitor between VCC and GND, placed as close as possible to the device pins. This stabilizes the internal regulator and suppresses high-frequency noise coupling, ensuring specified 20 kHz bandwidth and low-noise (150 μV rms) performance per Typical Characteristics data.
A1302KUA-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 ~ 6V
- Current - Supply (Max):
- 11mA
- Current - Output (Max):
- 10mA
- Resolution:
- -
- Bandwidth:
- 20kHz
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Features:
- -
- Supplier Device Package:
- 3-SIP
- Mounting Type:
- Through Hole
A1302KUA-T FAQ
1.How can I place an order for A1302KUA-T through Aetrix?
Please submit a Request for Quotation (RFQ) for A1302KUA-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 A1302KUA-T reliable?
The price and inventory of A1302KUA-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A1302KUA-T is usually 5 days.
3.What payment methods are accepted for A1302KUA-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A1302KUA-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A1302KUA-T?
A1302KUA-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A1302KUA-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 A1302KUA-T?
For technical support, including A1302KUA-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A1302KUA-T requirements.
6.How does Aetrix verify that A1302KUA-T is sourced from the original manufacturer or authorized distributors?
All A1302KUA-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 A1302KUA-T meets industry standards.
7.What is the process for return or replacement of A1302KUA-T?
All A1302KUA-T units undergo pre-shipment inspection (PSI). If there is an issue with A1302KUA-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 A1302KUA-T part is unused and in its original packaging.
Return procedure for A1302KUA-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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