Allegro MicroSystems A1302EUA-T

Overview

A1302EUA-T from Allegro MicroSystems is a continuous-time, ratiometric, linear Hall-effect sensor IC optimized for accurate voltage output proportional to applied magnetic field. It delivers 1.3 mV/G typical sensitivity, 50% VCC quiescent output, and operates from 4.5–6.0 V over –40°C to +85°C ambient range. Used in industrial position sensing for linear and rotational motion detection with SIP through-hole mounting.

For engineers reviewing the A1302EUA-T datasheet, A1302EUA-T pinout, A1302EUA-T application, or A1302EUA-T equivalent, key selection criteria include its ratiometric rail-to-rail output, low-noise performance (150 μV rms), fast 3–5 μs power-on time, and robust ESD tolerance-critical for reliable operation in motor control feedback and factory automation systems.

Technical Context

The A1302EUA-T integrates a Hall circuit, linear amplifier, and CMOS Class A output stage on a single die to minimize analog signal integrity issues. Its ratiometric architecture ensures both quiescent output voltage and magnetic sensitivity scale linearly with supply voltage, enabling stable operation across VCC variations.

Internal end-of-line gain and offset trimming deliver high precision without external calibration. The device features rail-to-rail output swing, 20 kHz bandwidth, and ±2.5% linearity at 25°C-supporting accurate analog field measurement in real-time motion control loops.

Key Specifications

Pinout & Package

Package: 3-pin ultramini SIP (Single In-line Package), through-hole mount, Pb-free with 100% matte tin leadframe. Dimensions: 15.75 mm × 1.52 mm × 4.09 mm (L×W×H), branded face orientation defined per Allegro DWG-9049.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar linear Hall-effect sensor applications.

Compared with A1302EUA-T, the A1324LLHLT-T offers greater sensitivity and temperature range but mandates surface-mount reflow and layout changes, while the MLX90242ESE-GAA-100-SP provides programmability and tighter supply flexibility at the cost of added firmware complexity-neither is pin-compatible, requiring mechanical and electrical redesign.

Availability

A1302EUA-T is available at Aetrix Electronics and suitable for industrial motor control, factory automation, hydraulic actuation, and flow metering applications requiring stable component supply and long-term lifecycle support.

Supply support for A1302EUA-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 high-performance magnetic sensing and power ICs, headquartered in Worcester, Massachusetts.

The A1302EUA-T belongs to Allegro's continuous-time linear Hall-effect sensor product line, designed specifically for robust, high-accuracy analog position and motion sensing in industrial and automotive subsystems.

FAQ

What is the operating temperature range for the A1302EUA-T?

The A1302EUA-T is rated for an operating ambient temperature range of –40°C to +85°C. This specification is confirmed in the Absolute Maximum Ratings table and validated across device characterization data, including quiescent output voltage and sensitivity vs. temperature plots. The A1302EUA-T uses the "E" grade designation, distinguishing it from the "K" grade (–40°C to +125°C) variants like A1302KUA-T. Operation outside this range may result in parametric deviation or functional failure.

Does the A1302EUA-T require external components for basic operation?

No, the A1302EUA-T operates autonomously with only VCC, GND, and load connected to VOUT. It contains fully integrated Hall element, amplifier, and CMOS Class A output stage. No external capacitors, resistors, or trimming components are needed for nominal function. A bypass capacitor (e.g., 0.1 µF ceramic) is recommended near VCC/GND per best practices, but not required for specification compliance. Internal gain and offset are factory-trimmed at end-of-line, eliminating calibration circuitry.

How does the ratiometric behavior of the A1302EUA-T affect system design?

The A1302EUA-T's ratiometric architecture means both its quiescent output voltage and magnetic sensitivity scale linearly with VCC. For example, at 4.5 V supply, VOUTQ ≈ 2.25 V and sensitivity ≈ 1.17 mV/G; at 6.0 V, VOUTQ ≈ 3.0 V and sensitivity ≈ 1.56 mV/G. This eliminates errors from supply drift when the ADC reference shares the same VCC rail-enabling simplified, low-cost analog front-end designs without dedicated voltage references or gain compensation algorithms.

What is the pin configuration of the A1302EUA-T SIP package?

The A1302EUA-T uses a 3-pin ultramini SIP package with pin 1 = VCC, pin 2 = GND, and pin 3 = VOUT, as confirmed in the Terminal List and Pin-out Drawings sections of the datasheet. The branded face faces upward during mounting, with pin 1 identified by a mold ejector pin indent and branding "NNT" (where "T" denotes Pb-free finish). This configuration is identical across all UA-suffix variants, including A1301EUA-T and A1302KUA-T.

Can the A1302EUA-T be used in safety-critical systems?

The A1302EUA-T is not certified for safety-critical applications such as medical life support or automotive ASIL-B/D systems. Allegro explicitly states that its products "are not to be used in life support devices or systems" where failure could cause harm. While the device exhibits solid-state reliability and robust ESD performance (>4 kV HBM), it lacks functional safety documentation (e.g., FMEDA, FIT rate, ISO 26262 qualification), diagnostic coverage, or redundancy features required for IEC 61508 or ISO 26262 compliance. Use in non-safety-critical industrial monitoring is appropriate.