Allegro MicroSystems A1384ELHLT-T

Overview

A1384ELHLT-T from Allegro MicroSystems is a programmable linear Hall effect sensor IC with analog voltage output, designed for high-accuracy magnetic field measurement in compact automotive and industrial systems. It delivers 2.00–3.00 mV/G sensitivity, 27 kHz internal bandwidth, ±40 mV quiescent output drift over –40°C to +85°C, and ratiometric operation with 5 V supply. Used in throttle position sensing and current monitoring where end-of-line calibration and thermal stability are critical.

For engineers reviewing the A1384ELHLT-T datasheet, A1384ELHLT-T pinout, A1384ELHLT-T application, or A1384ELHLT-T equivalent, this page provides verified technical context, confirmed package mapping (SOT-23W), validated pin functions, real-world application constraints, and two documented alternative parts with explicit functional and parametric differences.

Technical Context

The A1384ELHLT-T integrates a BiCMOS Hall element with dynamic offset cancellation and chopper stabilization at 170 kHz, enabling precise DC magnetic field measurement immune to thermal and mechanical stress. Its analog output is ratiometric to VCC, with programmable quiescent voltage (2.3–2.6 V), sensitivity (2.00–3.00 mV/G), polarity, and sensitivity temperature coefficient (0.00–0.095 %/°C).

Programming occurs via voltage pulses applied to the VOUT pin-using VP(LOW)/VP(MID)/VP(HIGH) levels-to configure fuses for offset, gain, TC, and lock bits. The device features clamped low-impedance output (±0.55 V clamp at 5 V), 18 mV_p-p noise (typ.), and 19 µs power-on time, optimized for closed-loop feedback in motor control and brake pedal position systems.

Key Specifications

Pinout & Package

Package: SOT-23W (3-pin, thin-profile surface-mount). Pin 1 = VCC (power input, bypass capacitor required), Pin 2 = GND (circuit reference), Pin 3 = VOUT (analog output and programming interface).

Key Features

Applications

Equivalent & Alternatives

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

Compared with A1384ELHLT-T, A1389ELHLT-T offers higher bandwidth and lower drift for next-gen automotive systems, while A1324LLHLT-T trades programmability for tighter initial accuracy and simpler manufacturing-neither is pin-compatible nor drop-in, requiring layout and firmware review.

Availability

A1384ELHLT-T is available at Aetrix Electronics and suitable for throttle position sensing, brake pedal monitoring, and motor commutation feedback requiring stable component supply in legacy automotive ECUs and industrial motion controllers.

Supply support for A1384ELHLT-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 for automotive and industrial markets.

The A138x family-including A1384ELHLT-T-was engineered for high-accuracy, programmable linear Hall sensing in space-constrained applications demanding thermal stability, ratiometric operation, and end-of-line calibration capability.

FAQ

Is A1384ELHLT-T still in production?

No, A1384ELHLT-T is a discontinued product per Allegro's December 2015 status update. It is no longer manufactured or available for new design-in. Samples are unavailable. For new projects, Allegro recommends migrating to A1389ELHLT-T, which maintains SOT-23W compatibility and improves key specs including bandwidth and temperature drift. A1384ELHLT-T remains supported for existing production through authorized distributors with remaining stock.

What is the exact package type and footprint for A1384ELHLT-T?

A1384ELHLT-T uses the SOT-23W (also designated LH) package: a 3-pin, thin-profile surface-mount outline with 0.95 mm max height, 2.9 mm × 1.6 mm body, and 0.95 mm pin pitch. Pin 1 (VCC) is marked by a dot; pin order is VCC–GND–VOUT. This footprint matches A1381/A1383 variants in LH suffix and is incompatible with the UA (SIP) through-hole variant.

Can A1384ELHLT-T be programmed after soldering to a PCB?

Yes, A1384ELHLT-T supports end-of-line programming via voltage pulses applied to the VOUT pin while powered. Programming requires VP(MID) = 14–16 V and VP(HIGH) = 26–28 V pulses with precise timing (e.g., 30 µs high pulse width). A dedicated Allegro evaluation kit is recommended; direct microcontroller-driven pulses risk incomplete fuse blowing due to current/slew limitations. All parameters-including sensitivity, offset, polarity, and lock bit-are configurable post-assembly.

What is the maximum allowable ambient temperature for continuous operation of A1384ELHLT-T?

A1384ELHLT-T is rated for continuous operation from –40°C to +85°C ambient temperature (Range E). Its junction temperature must not exceed 165°C. With the SOT-23W package on a 1-layer PCB (R_θJA = 228°C/W), maximum continuous V_CC derates to ~5.5 V at 85°C. For operation above 85°C ambient, Allegro specifies the A1384LLHLT-T variant (Range L, –40°C to +150°C), which shares identical electrical specs but different thermal qualification.

Does A1384ELHLT-T support bidirectional magnetic field detection?

Yes, A1384ELHLT-T supports bidirectional detection via polarity programming. By default (POL = 0), VOUT increases with south-pole field and decreases with north-pole field. Setting the POL bit reverses this behavior. The output spans ~0.55 V (low clamp) to ~4.5 V (high clamp) at 5 V V_CC, enabling full-scale measurement of both positive and negative magnetic fields centered at the programmable quiescent voltage (2.3–2.6 V).