Allegro MicroSystems A19350LUBATN-FBE-A

Overview

A19350LUBATN-FBE-A from Allegro MicroSystems is a high-accuracy, ASIL B–compliant GMR wheel speed and direction sensor IC with two-wire current-source output, integrated 2.2 nF capacitor, and solid-speed digital architecture for vibration-immune operation in automotive wheel-end applications. It delivers forward/reverse pulse-width encoded speed and direction signals over air gaps up to 300 G differential field range, operating from –40°C to +150°C with supply voltage from 4 V to 24 V.

For engineers reviewing the A19350LUBATN-FBE-A datasheet, A19350LUBATN-FBE-A pinout, A19350LUBATN-FBE-A application, or A19350LUBATN-FBE-A equivalent, this page provides verified technical context, pin-level design meaning, real-world automotive use cases, and validated alternative options for wheel speed sensing systems requiring functional safety compliance and robust EMC performance.

Technical Context

The A19350LUBATN-FBE-A integrates four GMR elements (E1–E4) in differential pairs to sense ring magnet pole transitions, enabling precise edge detection and dynamic threshold adaptation. Its SolidSpeed Digital Architecture implements real-time signal conditioning, direction validation, and vibration immunity via configurable calibration cycles and sequential signal variation tolerance (40–200% period-to-period).

This variant uses the -FBE configuration: Forward rotation defined as target motion from pin 1 to pin 2, ASIL protocol enabled, and warning/standstill pulses disabled. It outputs t_W(FWD) = 76–104 μs and t_W(REV) = 153–207 μs pulses at up to 3.9 kHz forward frequency, with built-in EEPROM traceability and diagnostics covering regulator and front-end faults.

Key Specifications

Pinout & Package

Package: UB - 2-pin single-in-line (SIP), overmolded, lead-free with tin-plated leadframe, includes molded lead-stabilizing bar for shipping robustness and assembly reliability.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar wheel speed and direction sensing applications.

Compared with A19350LUBATN-FBE-A, the A19351 offers higher thermal resilience and precision at identical footprint, while the ATS6858 trades integrated EMC robustness and traceability for lower BOM count - making the A19350 optimal for first-tier suppliers needing drop-in reliability and full process visibility.

Availability

A19350LUBATN-FBE-A is available at Aetrix Electronics and suitable for ABS wheel speed sensing, electric power steering motor monitoring, and transmission input shaft direction detection requiring stable component supply, ASIL B compliance, and long-term automotive lifecycle support.

Supply support for A19350LUBATN-FBE-A 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 and manufacturer of high-performance magnetic sensors and power ICs, specializing in automotive-grade motion sensing solutions since 1989.

The A19350 belongs to Allegro's GMR wheel speed sensor product line, engineered specifically for functional safety–critical automotive applications where robust direction sensing, vibration immunity, and EMC resilience are mandatory in harsh under-vehicle environments.

FAQ

What is the function of the integrated 2.2 nF capacitor in the A19350LUBATN-FBE-A?

The integrated 2.2 nF ceramic capacitor in the A19350LUBATN-FBE-A is connected between VCC (pin 1) and GND (pin 2) to suppress high-frequency noise and improve electromagnetic compatibility (EMC) without requiring external components. It is embedded within the UB overmolded SIP package, contributing directly to the device's robustness against conducted and radiated disturbances in automotive environments. This capacitor ensures stable internal supply regulation during fast current transients generated by the two-wire pulse-width output protocol.

How does the A19350LUBATN-FBE-A determine forward versus reverse rotation?

The A19350LUBATN-FBE-A determines forward versus reverse rotation by analyzing phase relationships between differential magnetic signals from its four GMR elements (E1–E4). For the -FBE-A variant, forward rotation is defined as target motion from pin 1 to pin 2, triggering a 76–104 μs pulse width (t_W(FWD)). Reverse rotation produces a longer 153–207 μs pulse (t_W(REV)). The internal SolidSpeed Digital Architecture validates direction using sequential signal variation thresholds and dynamic switch-point separation (≥20% pk-pk), ensuring accuracy even during rapid direction changes.

Is the A19350LUBATN-FBE-A pin-compatible with Hall-effect wheel speed sensors?

Yes, the A19350LUBATN-FBE-A is designed as a drop-in replacement for Hall-effect sensors in wheel speed applications, using the same 2-pin SIP UB package and identical mechanical orientation (branded face toward target). Its GMR technology achieves equivalent magnetic sensitivity and switching behavior while offering superior common-mode rejection, larger air-gap capability, and inherent vibration immunity - all without requiring PCB or harness modifications.

What safety documentation accompanies the A19350LUBATN-FBE-A for ASIL B integration?

The A19350LUBATN-FBE-A is delivered with an ISO 26262-compliant Safety Manual (document MCO-0000526), FMEDA report, and hardware safety analysis summary confirming ASIL B capability as a safety element out-of-context (SEooC). These documents specify required integration conditions - including diagnostic coverage targets, safe-state timing (t_RESET(EP2) = 3–6 ms), and usage constraints - enabling seamless integration into ABS, ESC, or ADAS ECUs without additional hardware qualification.

Does the A19350LUBATN-FBE-A support standstill detection?

No, the A19350LUBATN-FBE-A uses the -FBE configuration, which disables warning and standstill pulses (suffix 'M' or 'E' required for those features). It outputs only forward and reverse direction pulses during motion. Standstill behavior is suppressed to avoid false low-speed artifacts in high-dynamic applications like ABS, where continuous pulse generation during near-zero speed could interfere with slip detection algorithms.