Allegro MicroSystems A19303LUBATN-FWPE

Overview

A19303LUBATN-FWPE from Allegro MicroSystems is a vibration-tolerant, high-accuracy Hall-effect wheel speed and direction sensor IC in a 2-pin SIP UB package. It delivers digital PW protocol output with forward/reverse pulse width encoding, operates from 4 V to 24 V, supports up to 3.9 kHz forward frequency, and features integrated 2.2 nF supply capacitor for enhanced EMC robustness-designed specifically for automotive ABS wheel-end sensing.

For engineers reviewing the A19303LUBATN-FWPE datasheet, A19303LUBATN-FWPE pinout, A19303LUBATN-FWPE application, or A19303LUBATN-FWPE equivalent, this page provides verified functional identity, UB-package pin mapping, PW protocol timing parameters (tW(FWD) = 90 µs typ., tW(REV) = 180 µs typ.), vibration-immune direction detection, and real-world ABS system integration context.

Technical Context

The A19303LUBATN-FWPE implements a SolidSpeed Digital Architecture with three integrated Hall elements arranged in differential pairs (E1–E2, E2–E3) to extract precise edge timing and direction from ring magnet or back-biased ferromagnetic targets. Its digital controller dynamically sets switching thresholds based on peak magnetic signal amplitude and enforces a 4 TCYCLE rolling window (TWINDOW) to suppress vibration-induced false transitions.

This variant uses the PW protocol (-FWPE suffix), where direction is encoded via pulse width: forward rotation outputs 90 µs pulses (typ.), reverse rotation outputs 180 µs pulses (typ.), and warning pulses (45 µs typ.) activate when air gap exceeds 24 Gpk-pk. It features low-vibration immunity (L-suffix), enabling immediate direction change detection without blanking delay.

Key Specifications

Pinout & Package

The A19303LUBATN-FWPE is housed in a lead-free, tin-plated 2-pin SIP UB package (18.00 mm × 4.00 mm × 1.80 mm), overmolded with integrated capacitor and molded lead-stabilizing bar for mechanical robustness during shipping and SMT assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with A19303LUBATN-FWHE, A19303LUBATN-FWPE prioritizes minimal direction latency over vibration suppression-critical for responsive ABS actuation. Against ATS6858LSGT-T, it delivers higher frequency capability, built-in capacitance, and dual-protocol support, reducing system-level design complexity and test validation effort.

Availability

A19303LUBATN-FWPE is available at Aetrix Electronics and suitable for automotive ABS, ESC, TCS, and EPS applications requiring stable component supply, AEC-Q100-compliant sourcing, and long-term lifecycle continuity.

Supply support for A19303LUBATN-FWPE 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 A19303 product line is engineered for vibration-immune, high-accuracy wheel speed and direction sensing in safety-critical automotive systems-including ABS, ESC, and ADAS domain controllers.

FAQ

What is the primary function of the A19303LUBATN-FWPE in automotive systems?

The A19303LUBATN-FWPE functions as a two-wire, Hall-effect-based wheel speed and direction sensor IC optimized for automotive ABS and ESC systems. It detects rotational speed and direction from ring magnets or ferromagnetic targets using differential Hall elements and outputs direction-encoded pulse widths (PW protocol). Its SolidSpeed Digital Architecture maintains accuracy during dynamic air gap changes and vibration, and its integrated 2.2 nF capacitor enhances EMC performance without external components. The A19303LUBATN-FWPE is qualified to AEC-Q100 Grade 0 and operates from –40 °C to +150 °C.

How does the PW protocol in A19303LUBATN-FWPE encode direction information?

The A19303LUBATN-FWPE encodes direction using pulse width modulation in its PW protocol: forward rotation generates pulses with width 76–104 µs (90 µs typ.), while reverse rotation produces 153–207 µs pulses (180 µs typ.). Warning pulses (38–52 µs) activate when air gap falls below 24 Gpk-pk, and standstill pulses (1232–1656 µs) indicate zero rotation. This deterministic timing allows standard ABS ECUs to decode direction without additional signal conditioning. The A19303LUBATN-FWPE does not use AK protocol-its -FWPE suffix confirms exclusive PW operation.

What is the significance of the "L" in the A19303LUBATN-FWPE part number?

Within the A19303LUBATN-FWPE part number, the "L" denotes Low vibration immunity mode. Unlike the "H" (high) variant, the L-suffix disables output blanking during vibration events-ensuring continuous pulse output and immediate direction reporting after any rotation change. This behavior minimizes latency in safety-critical ABS interventions. The A19303LUBATN-FWPE recovers direction validity within 1.75 TCYCLE post-vibration, making it ideal for passenger vehicles where rapid brake response is prioritized over sustained vibration filtering.

Does the A19303LUBATN-FWPE require an external decoupling capacitor?

No, the A19303LUBATN-FWPE does not require an external decoupling capacitor. It integrates a 2.2 nF high-temperature ceramic capacitor internally between pins 1 (VCC) and 2 (GND) within its overmolded UB package. This monolithic integration eliminates the need for external passive components, reduces PCB area, improves high-frequency EMC robustness per ISO 11452-2, and enhances manufacturing reliability. The A19303LUBATN-FWPE's internal capacitor is rated for full operating temperature range (–40 °C to +150 °C) and supports stable regulation under transient load conditions.

What target types are compatible with the A19303LUBATN-FWPE?

The A19303LUBATN-FWPE supports two target configurations: ring magnets (e.g., diametrically magnetized ferrite or neodymium) and ferromagnetic gear teeth when used with a properly sized back-biasing magnet. Its differential Hall architecture (E1–E2 and E2–E3) rejects common-mode noise and enables accurate edge detection even with moderate target wobble or axial misalignment. The A19303LUBATN-FWPE's magnetic temperature compensation (–xxxE variant) is calibrated for ferrite and neodymium magnets, ensuring consistent air gap performance across –40 °C to +150 °C ambient.