Diodes Incorporated ZXBM2004JA16TC

Overview

ZXBM2004JA16TC from Diodes Incorporated is a two-phase BLDC motor pre-driver IC designed for variable-speed fan and blower control. It operates from 4.7V to 18V, delivers 80mA source / 16mA sink per phase output (Ph1/Ph2), integrates Hall amplifier inputs (H+/H−), provides rotor lock detection (RD) with auto-restart, and features FG tachometer output and SPD voltage-based speed control (1V–3V = 100%–0% PWM).

For engineers reviewing the ZXBM2004JA16TC datasheet, ZXBM2004JA16TC pinout, ZXBM2004JA16TC application, or ZXBM2004JA16TC equivalent, key selection factors include its U-QFN3030-16 package thermal performance (1500 mW on 2-layer PCB), CPWM-settable 24 kHz PWM frequency (0.1 nF), ThRef 2.96 V reference output, and dual-phase drive architecture optimized for thermistor-, DC-, or PWM-controlled cooling systems.

Technical Context

The ZXBM2004JA16TC implements sensor-based commutation using differential Hall inputs (H+/H−) to detect rotor position and drive two external low-side power switches via Darlington emitter-follower outputs (Ph1/Ph2). Its internal Hall amplifier accepts either 4-pin naked or 3-pin buffered Hall sensors, with common-mode input range of 0.5×VCC ±1.5 V and ±7 mV offset.

Speed regulation is achieved by analog voltage control on SPD (1V–3V → 100%–0% PWM duty), while SMIN sets minimum speed via ThRef-referenced divider. Rotor lock protection uses CLCK capacitor timing to trigger RD open-collector alert and automatic restart cycles, and FG provides open-drain tachometer pulses synchronized to magnetic transitions.

Key Specifications

Pinout & Package

Package: U-QFN3030-16 - 3.0 mm × 3.0 mm, 0.4 mm pitch, 0.6 mm height, exposed thermal pad; rated for 1500 mW dissipation on 2-layer 2 oz. copper PCB with thermal vias.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar two-phase BLDC pre-driver applications.

Compared with A3977SLDTR-T and NCV7240DPR2G, the ZXBM2004JA16TC uniquely integrates Hall amplification, tachometer generation, rotor lock recovery, and analog speed control in a compact U-QFN package-making it purpose-built for cost-sensitive, self-contained fan control where reliability and minimal external components are critical.

Availability

ZXBM2004JA16TC is available at Aetrix Electronics and suitable for desktop PC cooling, instrumentation fan control, and automotive climate control requiring stable component supply, RoHS-compliant packaging, and long-term industrial availability.

Supply support for ZXBM2004JA16TC 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 manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability power management, signal integrity, and motor control solutions for industrial and consumer markets.

The ZXBM2004 belongs to Diodes' motor control pre-driver product line, engineered specifically for cost-optimized, sensor-based variable-speed cooling applications in computing, instrumentation, and climate systems - emphasizing integration, thermal robustness, and ease of system-level validation.

FAQ

What Hall sensor types are supported by the ZXBM2004JA16TC?

The ZXBM2004JA16TC supports both 4-pin differential-output Hall sensors (connected across H+ and H−) and 3-pin unipolar/bipolar switching Hall sensors (H+ connected to output, H− biased to VCC/2 via external divider). Internal Hall amplifier common-mode range (0.5×VCC ±1.5 V) and ±7 mV offset ensure reliable operation across temperature with standard off-the-shelf Hall elements.

How is rotor lock detection implemented, and can the timing be adjusted?

Rotor lock detection uses internal timing based on the CLCK pin capacitor value. When Hall transitions cease for longer than TLOCK (set by CLCK cap), RD goes high and Ph1/Ph2 disable. After TOFF delay, the device attempts restart for TON duration. All three intervals scale linearly with CLCK capacitance - e.g., doubling CLCK doubles TLOCK, TOFF, and TON - enabling customization for motor inertia and system response requirements.

What is the role of the V+OP pin, and how should it be connected?

V+OP supplies the Ph1 and Ph2 output drivers independently from VCC. For bipolar transistor switches, connect V+OP to VCC through a current-limiting resistor (value selected per transistor base current requirement). For MOSFETs, connect V+OP directly to VCC to maximize gate drive voltage and switching speed. This separation optimizes drive strength and thermal performance across switch technologies.

Can the ZXBM2004JA16TC operate with a 24 V motor supply?

No - the absolute maximum VCC rating is 20 V, and recommended operating range is 4.7 V to 18 V. For 24 V motor systems, an external regulator (e.g., Zener diode or LDO) must supply ≤18 V to VCC and V+OP. The datasheet explicitly states that exceeding 18 V requires external regulation; direct 24 V connection risks permanent damage per Absolute Maximum Ratings (VCCMAX = +20 V).