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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Motor Drivers, Controllers

Diodes Incorporated ZXBM1021Q20TC

Name: ZXBM1021Q20TC
Brand: Diodes Incorporated
SKU: ZXBM1021Q20TC
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ZXBM1021Q20TC

Manufacturer:: Diodes Incorporated

Category:: Motor Drivers, Controllers

Package:: 20-SSOP (0.154", 3.90mm Width)

Datasheet:: ZXBM1021Q20TC.pdf

Description:: IC MOTOR CTLR PAR/PWM 20QSOP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

ZXBM1021Q20TC from Diodes Incorporated is a single-phase BLDC motor pre-driver IC designed for variable-speed fan and blower control, featuring 6.8–18 V operating range, integrated Hall amplifier (1.75 V HBIAS), programmable overcurrent protection (via SetTh/Sense), rotor lock detection with auto-restart, and dual-speed control modes (PWM or DC voltage). It drives external half-bridge MOSFETs in cooling systems requiring soft-start and tachometer feedback.

For engineers reviewing the ZXBM1021Q20TC datasheet, ZXBM1021Q20TC pinout, ZXBM1021Q20TC application, or ZXBM1021Q20TC equivalent, key selection considerations include Hall sensor interface compatibility, FG open-collector tach output drive capability, CLCK capacitor-based timing configuration, and dual-package support (U-QFN4040-20 and QSOP-20) for thermal and layout flexibility.

Technical Context

The ZXBM1021Q20TC integrates a differential Hall amplifier with 1.75 V bias (HBIAS), 5 V reference (ThRef), and analog comparators for current limiting (Sense vs. SetTh) and speed regulation (SPD/CSPD). Its phase drive logic generates complementary high-side (Ph1Hi/Ph2Hi, 50 mA open-collector) and low-side (Ph1Lo/Ph2Lo, 100 mA Darlington emitter-follower) outputs synchronized to Hall transitions.

Lock detection uses CLCK pin timing: internal charge/discharge currents (ILCKCR = 5.5 µA run mode; ILCKDL = 0.7 µA lock mode) set tLCKDET (~400 ms) and tOFF (~3 s) with a 470 nF capacitor. Soft-start ramps SetThRef from 0 to ThRef over ~3 s, gradually enabling full current limit to prevent inrush.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	6.8 V to 18 V - supports 12 V nominal fan systems with headroom for automotive transients and regulator dropout.
Hall Bias Output	1.75 V typical (HBIAS) - directly powers unbuffered 4-pin Hall sensors without external regulators.
Reference Voltage	5.0 V ±2.5% (ThRef) - stable reference for SMIN minimum speed divider and SetThRef threshold generation.
FG Output Type	Open-collector buffered Hall signal - requires external pull-up; provides tachometer frequency proportional to motor RPM.
Soft-Start Time	~3 s (CLCK = 470 nF) - linear ramp of SetThRef prevents coil saturation and audible startup noise.
Rotor Lock Response	Detects stalled rotor within 400 ms, disables outputs for 3 s, then auto-restarts with soft-start.
Current Sense Threshold	Programmable via SetThRef (ThRef − 0.1 V typical) - sets overcurrent trip point using external sense resistor.

Pinout & Package

The ZXBM1021Q20TC is packaged in QSOP-20 (20-pin, 0.635 mm pitch, 7.5 mm × 12.8 mm body), a surface-mount package with gull-wing leads optimized for automated assembly and thermal dissipation in fan control PCBs.

Pin/Terminal	Circuit Role	Design Meaning
VCC	Main power supply input	6.8–18 V input powering internal circuitry and high-side drivers; decoupled with 1 µF ceramic.
H+, H−	Differential Hall sensor inputs	Accept raw Hall element output; internal amplifier enables direct connection without external op-amps.
Ph1Hi, Ph2Hi	High-side gate drive outputs	50 mA open-collector outputs driving external N-channel MOSFET gates; require pull-up resistors.
Ph1Lo, Ph2Lo	Low-side gate drive outputs	100 mA Darlington emitter-follower outputs with active pull-down; drive MOSFET sources or bipolar bases.
FG	Tachometer signal output	Open-collector Hall-synchronized pulse train; frequency equals motor pole-pair count × RPM/60.
CLCK	Timing capacitor node	Connects to 470 nF capacitor to set soft-start duration, lock-detect timeout, and auto-restart delay.
Sense, SetTh	Current limit monitoring interface	Sense reads voltage across ground-return shunt; SetTh compares it to SetThRef-derived threshold for OCP.

Key Features

Feature	Design Value
Dual speed control interface	Accepts either PWM (0–100% duty, ≤100 kHz) or DC voltage (1–3 V) on SPD/PWMSPD pins - enables flexible MCU or analog control.
Integrated Hall bias and amplifier	1.75 V HBIAS output + differential input stage - eliminates external biasing components for bare Hall sensors.
Programmable minimum speed	SMIN pin accepts 1–3 V from ThRef divider - clamps SPD voltage to prevent motor stall at low demand.
Auto-recover rotor lock protection	CLCK-based timing detects stall, shuts down drives for 3 s, then re-attempts soft-start - improves system reliability without host intervention.
Thermally enhanced packaging	QSOP-20 package supports 820 mW power dissipation - sustains continuous operation in enclosed fan housings up to +110°C ambient.

Applications

Server Cooling Fans

Home Appliance Blowers

Use Scenario: 12 V, 4-wire brushless fans in 1U/2U rack servers requiring precise speed control and tach feedback for thermal management.

IC Role / Device Role / Timing Role: Pre-driver IC generating phase-commutated gate signals synchronized to Hall sensor transitions; FG pin delivers RPM data to BMC.

Use Value: Soft-start prevents inrush current during cold boot; rotor lock detection avoids thermal runaway if fan blade obstructs.

Use Scenario: Variable-speed blowers in HVAC duct systems and range hoods, controlled by microcontroller PWM or thermistor network.

IC Role / Device Role / Timing Role: Motor controller translating DC voltage (from thermistor divider) into commutated drive; CLCK pin configures 3 s soft-start for quiet startup.

Use Value: Minimum speed setting (SMIN) ensures airflow continuity even at low temperature setpoints; 5 V ThRef powers external sensing networks.

Industrial Extraction Fans

Hand-Held Power Tools

Use Scenario: Dust extraction fans in CNC workshops operating continuously at 40–85°C ambient with frequent load changes.

IC Role / Device Role / Timing Role: High-voltage pre-driver (up to 18 V) managing external MOSFET half-bridges; Sense/SetTh enable real-time current limiting against clogged filters.

Use Value: Overcurrent protection prevents MOSFET failure during filter blockage; FG output enables predictive maintenance via RPM trend analysis.

Use Scenario: Compact cordless drill or angle grinder with BLDC motor requiring compact, efficient drive and stall recovery.

IC Role / Device Role / Timing Role: Pre-driver delivering 100 mA low-side sink current to drive discrete MOSFETs; HBIAS powers integrated Hall sensor in motor housing.

Use Value: Auto-restart after rotor lock (e.g., bit jam) resumes operation without manual reset; U-QFN4040-20 variant enables ultra-thin PCB integration.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STSPIN220	Integrated power stage (2 A half-bridge); no external MOSFETs required; lacks Hall bias output and FG tach.	Better for space-constrained, low-current (<2 A) fans; unsuitable where discrete MOSFETs or tach feedback are mandatory.	Select STSPIN220 only when integrating power and reducing BOM count outweighs need for FG output and Hall bias flexibility.
MP6532	Single-chip 3-phase pre-driver; supports trapezoidal commutation; requires external Hall latching IC; no built-in CLCK timing.	Designed for 3-phase motors (e.g., larger blowers); lacks rotor lock auto-restart and soft-start ramping logic.	Choose MP6532 for 3-phase systems needing higher torque density; avoid for single-phase fan designs requiring lock recovery.

Compared with STSPIN220 and MP6532, the ZXBM1021Q20TC uniquely combines Hall bias generation, FG tach output, CLCK-configurable lock recovery, and dual-package support-making it optimal for cost-sensitive, single-phase fan applications demanding field-proven reliability and serviceability.

Availability

ZXBM1021Q20TC is available at Aetrix Electronics and suitable for server cooling fans, home appliance blowers, and industrial extraction systems requiring stable component supply, long-lifecycle support, and RoHS-compliant manufacturing.

Supply support for ZXBM1021Q20TC 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, with emphasis on power management, signal integrity, and motor control solutions.

The ZXBM1021 belongs to Diodes' motor driver product line, engineered specifically for cost-effective, reliable single-phase BLDC fan and blower control in computing, appliance, and industrial environments.

FAQ

What speed control interfaces does the ZXBM1021Q20TC support?

The ZXBM1021Q20TC supports two independent speed control methods: a TTL-compatible PWM signal applied to the PWMSPD pin (0–100% duty, ≤100 kHz), or a DC voltage (1–3 V) applied to the SPD pin. In PWM mode, CSPD integrates the signal to generate a DC control voltage; in DC mode, SPD directly sets the drive ratio. Both modes coexist with SMIN-based minimum speed clamping.

How does rotor lock protection work and what happens after detection?

Rotor lock is detected when no Hall transition occurs for tLCKDET (~400 ms with 470 nF CLCK capacitor). Upon detection, all phase outputs disable for tOFF (~3 s), then the device initiates soft-start again. During soft-start, SetThRef ramps from 0 to ThRef, gradually increasing current limit to prevent repeated lock events. This cycle repeats until rotation resumes.

Can the ZXBM1021Q20TC drive both N-channel and P-channel MOSFETs?

The ZXBM1021Q20TC's Ph1Hi/Ph2Hi outputs are open-collector (50 mA sink), requiring external pull-ups to VCC for N-MOSFET high-side drive; Ph1Lo/Ph2Lo outputs are Darlington emitter followers (100 mA source/sink), suitable for N-MOSFET low-side or bipolar transistor bases. It does not support direct P-MOSFET high-side drive due to lack of charge pump or floating supply.

What is the function of the CLCK pin and how is its capacitor value selected?

The CLCK pin connects to a timing capacitor that sets three critical intervals: soft-start time (tSS), lock-detect timeout (tLCKDET), and lock-off duration (tOFF). With a 470 nF capacitor, tSS ≈ 3 s, tLCKDET ≈ 400 ms, and tOFF ≈ 3 s. Values scale linearly: doubling capacitance doubles all three times. Use X7R ceramic capacitors rated ≥16 V for stability across temperature.

ZXBM1021Q20TC Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: 20-SSOP (0.154", 3.90mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Motor Type - Stepper:: -

Motor Type - AC, DC:: Brushless DC (BLDC)

Function:: Controller - Commutation, Direction Management

Output Configuration:: Pre-Driver - Half Bridge (2)

Interface:: PWM

Technology:: -

Step Resolution:: -

Applications:: Fan Controller

Current - Output:: -

Voltage - Supply:: 6.8V ~ 18V

Voltage - Load:: -

Operating Temperature:: -40°C ~ 110°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 20-QSOP

ZXBM1021Q20TC FAQ

1.How can I place an order for ZXBM1021Q20TC through Aetrix?

Please submit a Request for Quotation (RFQ) for ZXBM1021Q20TC on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for ZXBM1021Q20TC reliable?

The price and inventory of ZXBM1021Q20TC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZXBM1021Q20TC is usually 5 days.

3.What payment methods are accepted for ZXBM1021Q20TC?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZXBM1021Q20TC transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ZXBM1021Q20TC?

ZXBM1021Q20TC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ZXBM1021Q20TC order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for ZXBM1021Q20TC?

For technical support, including ZXBM1021Q20TC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZXBM1021Q20TC requirements.

6.How does Aetrix verify that ZXBM1021Q20TC is sourced from the original manufacturer or authorized distributors?

All ZXBM1021Q20TC products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ZXBM1021Q20TC meets industry standards.

7.What is the process for return or replacement of ZXBM1021Q20TC?

All ZXBM1021Q20TC units undergo pre-shipment inspection (PSI). If there is an issue with ZXBM1021Q20TC, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The ZXBM1021Q20TC part is unused and in its original packaging.

Return procedure for ZXBM1021Q20TC:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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