Diodes Incorporated ZXBM5408Q-N-U

Overview

ZXBM5408Q from Diodes Incorporated is an AEC-Q100 Grade 1 qualified brushed DC motor driver IC with integrated H-bridge, servo control logic, and comprehensive fault protection. It delivers 0.8A continuous / 1.5A peak drive current, operates from 8V to 18V, and features programmable hysteresis, deadband, and angle amplification for precise position control in automotive headlight beam adjustment systems.

For engineers reviewing the ZXBM5408Q datasheet, ZXBM5408Q pinout, ZXBM5408Q application, or ZXBM5408Q equivalent, this device supports critical design tasks including servo loop tuning via external resistors, RANGE input fault detection (short-to-GND/supply/broken wire), and coordinated thermal, overvoltage, undervoltage, and overcurrent shutdown behavior.

Technical Context

The ZXBM5408Q implements a closed-loop servo controller with dedicated FB (feedback) and REF (reference) inputs, enabling real-time comparison of motor position against commanded setpoint. Its internal servo amplifier generates direction and brake commands based on VFB–VREF differential voltage, while HYST pin sets hysteresis window width (4% typical) and RANGE pin monitors potentiometer integrity using dual thresholds (VOFFL = 400 mV typ., VOFFH = 0 mV relative to VDD).

Control logic drives a fully integrated H-bridge with low RDS(on) MOSFETs (1.8–3.46 Ω total path), supporting bidirectional rotation (CW/CCW) and dynamic braking. Protection circuitry includes UVLO (7.4 V turn-on), OVP (20.5 V trip), OCP (1.5 A threshold), and TSD (170 °C shutdown with 30 °C hysteresis), all operating across –40 °C to +125 °C ambient.

Key Specifications

Pinout & Package

Package: PDIP-8 (Type A1), 0.496 g mass, matte tin-plated leads, moisture sensitivity level 1 per J-STD-020.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar brushed DC servo motor driver applications.

Compared with TB9051FTG and DRV8876N, the ZXBM5408Q uniquely integrates analog servo control, potentiometer fault detection, and automotive-grade protection in a single PDIP-8 package-reducing system complexity and validation effort for brushed DC position-critical applications.

Availability

ZXBM5408Q is available at Aetrix Electronics and suitable for automotive headlight control, industrial actuator positioning, mirror adjustment systems, and medical infusion pump motor drives requiring stable component supply under AEC-Q100 Grade 1 compliance.

Supply support for ZXBM5408Q 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

Diodes Incorporated is a global semiconductor company specializing in discrete, analog, and mixed-signal ICs for automotive, industrial, and consumer markets, with manufacturing certified to IATF 16949.

The ZXBM5408Q belongs to Diodes' automotive-qualified motor driver product line, designed specifically to replace mechanical relays and discrete transistor solutions in brushed DC servo applications requiring functional safety and long-term supply stability.

FAQ

What is the purpose of the RANGE pin on the ZXBM5408Q?

The RANGE pin monitors the integrity of the external potentiometer used for position feedback. It detects open-circuit conditions (voltage exceeding VDD) and short-to-ground faults (voltage below 400 mV) and immediately disables the H-bridge outputs to prevent uncontrolled motor movement-ensuring fail-safe behavior required in automotive ASIL-B systems.

Can the ZXBM5408Q operate from a 24 V supply?

No. The ZXBM5408Q has a maximum recommended operating supply voltage of 18 V. While its absolute maximum rating is 45 V for transient stress, sustained operation above 18 V will trigger overvoltage protection (VOVP_ON = 20.5 V typical), shutting down the outputs to protect the motor coil and internal circuitry.

How is hysteresis programmed on the ZXBM5408Q?

Hysteresis is programmed using two external resistors (RHYH and RHYL) connected to the HYST pin. Their ratio determines the center point of the hysteresis window, while their absolute values scale the window width (3–5 % of VDD). Equal resistors yield a symmetric 50 ± 2 % window centered at VDD/2.

Does the ZXBM5408Q require external current-sense resistors for overcurrent protection?

No. Overcurrent protection is fully integrated and does not require external sense resistors. The device monitors current through the internal MOSFET RDS(on) and triggers shutdown when load current exceeds 1.5 A for longer than 4 µs, followed by automatic 260 µs retry cycles until the fault clears.