Allegro MicroSystems A89500KEJSR

Overview

A89500KEJSR from Allegro MicroSystems is an AEC-Q100 qualified (Grade K), 100 V half-bridge N-channel MOSFET driver with independent logic-level HS/LS inputs, bootstrap gate drive architecture, and integrated cross-conduction protection. It operates from a single 8–15 V supply, supports 12 V/24 V/48 V power networks, and delivers ±2.7 A peak gate drive current for high-efficiency motor control in automotive actuators.

For engineers reviewing the A89500KEJSR datasheet, A89500KEJSR pinout, A89500KEJSR application, or A89500KEJSR equivalent, key selection criteria include its –40°C to 150°C ambient rating, wettable-flank 10-lead DFN package (EJ), bootstrap capacitor interface (C/S terminals), and RESETn-enabled sleep mode with 20 µA quiescent current.

Technical Context

The A89500KEJSR implements a floating high-side gate driver powered via external bootstrap capacitor (C–S), enabling operation with bridge supplies up to 100 V. Its internal logic enforces strict dead-time enforcement by forcing both GH and GL low when HS and LS are simultaneously high, eliminating shoot-through risk.

Each gate output features dual-stage pull-down: passive (950 kΩ) for fail-safe off-state during power loss, and active (10 kΩ) during normal operation. The device integrates an internal 3.3 V logic regulator (VDL) derived from VCC, with undervoltage lockout (6.65 V threshold, 0.35 V hysteresis) ensuring safe power-on reset behavior.

Key Specifications

Pinout & Package

Supplied in a 3 mm × 3 mm, 0.8 mm max height, 10-lead DFN package with exposed thermal pad and wettable flank (suffix EJ), lead-free with 100% matte-tin plating. Thermal resistance R_θJA = 28°C/W (4-layer PCB).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar half-bridge MOSFET driver applications.

Compared with MPQ6612AGU-A and LM5106MMX/NOPB, the A89500KEJSR uniquely combines 100 V bridge support, AEC-Q100 Grade K qualification, integrated sleep mode, and wettable flank packaging - making it the only option qualified for under-hood automotive actuator control without design compromises.

Availability

A89500KEJSR is available at Aetrix Electronics and suitable for automotive HVAC actuators, electric power steering assist motors, and commercial vehicle solenoid valves requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for A89500KEJSR 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 motion control, energy-efficient power conversion, and automotive-grade semiconductor solutions.

The A89500KEJSR belongs to Allegro's high-voltage gate driver product line, engineered specifically for robust, AEC-Q100-compliant control of brushed DC motors and inductive loads in demanding automotive and industrial environments.

FAQ

What is the maximum bridge supply voltage supported by the A89500KEJSR?

The A89500KEJSR supports bridge supply voltages up to 100 V, as confirmed in its Absolute Maximum Ratings table (VC – 0.3 to VCC + 100 V). This enables direct integration into 48 V automotive architectures without external level-shifting or isolation, while maintaining safe operation margins under transients.

Does the A89500KEJSR require an external bootstrap diode?

No, the A89500KEJSR integrates an internal bootstrap diode with forward voltage of 0.7–1.7 V (at 1 mA), eliminating the need for an external diode. This simplifies PCB layout and improves reliability in high-vibration automotive applications where discrete diode solder joints may fatigue.

How does the A89500KEJSR prevent cross-conduction in half-bridge configurations?

The A89500KEJSR implements hardware-level cross-conduction protection: when both HS and LS inputs are high, internal logic forces GH and GL outputs low simultaneously. This lockout behavior is documented in Table 1 (Control Logic) and prevents shoot-through regardless of external timing or software errors.

What is the purpose of the NC pin (Pin 2) on the A89500KEJSR?

Pin 2 is designated NC (No Connection) with no internal circuitry. However, Allegro's package documentation specifies it must be connected to GND to ensure mechanical stability, thermal conduction through the wettable flank, and consistent solder joint formation - especially critical for AEC-Q100-compliant manufacturing.

Can the A89500KEJSR operate with a 3.3 V logic supply?

Yes, the A89500KEJSR logic inputs (HS, LS, RESETn) are fully compatible with 3.3 V CMOS logic, with VIH(min) = 2.0 V and VIL(max) = 1.0 V, and 300 mV typical hysteresis. This allows direct interfacing with modern automotive microcontrollers without level-shifting circuitry.