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

Diodes Incorporated AH9280Z4-G1

Name: AH9280Z4-G1
Brand: Diodes Incorporated
SKU: AH9280Z4-G1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AH9280Z4-G1

Manufacturer:: Diodes Incorporated

Category:: Motor Drivers, Controllers

Package:: 4-SSIP

Datasheet:: AH9280Z4-G1.pdf

Description:: IC MOTOR DRIVER 2.5V-16V TO94

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Product details

Overview

AH9280Z4-G1 from BCD Semiconductor is a two-phase dual-coil high-voltage smart fan motor driver IC with integrated Hall sensor, designed for 5V/12V brushless DC cooling fans in PC, server, and power supply systems. It delivers peak output current up to 1200 mA, operates from 2.5 V to 16 V, and features auto-restart locked-rotor protection with 5 s off / 1 s on cycling. Its TO-94 package supports ambient temperatures up to 125°C.

For engineers reviewing the AH9280Z4-G1 datasheet, AH9280Z4-G1 pinout, AH9280Z4-G1 application, or AH9280Z4-G1 equivalent, key selection criteria include start-up voltage (2.5 V min), magnetic sensitivity (BOP: 20–50 G), saturation voltage (600–1000 mV at 350 mA), thermal resistance (208 °C/W), and built-in clamping diode for coil flyback suppression.

Technical Context

The AH9280Z4-G1 integrates a high-sensitivity Hall sensor and dual power MOSFET outputs in a single CMOS process, enabling direct commutation of two-phase BLDC fan coils without external transistors or discrete protection components. Its internal logic detects rotor position via magnetic flux (BOP/BRP hysteresis: 40 G) and controls DO/DOB phase timing.

Locked-rotor detection triggers automatic shutdown after 1 s of no motion, followed by repeated 5 s off / 1 s on cycles until rotation resumes-preventing thermal damage under stall conditions. The device includes ESD protection (6 kV HBM, 400 V MM) and a 35 V zener clamp on each output for inductive kick suppression.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	2.5–16 V: Enables operation across 5 V and 12 V fan rails with margin for ripple and dropout.
Peak Output Current	1200 mA: Sufficient to drive large axial or centrifugal cooling fans requiring high torque at startup.
Saturation Voltage	600–1000 mV @ 350 mA: Low conduction loss ensures <1 W total dissipation at full load, supporting 125°C ambient operation.
Magnetic Operating Point	BOP = 20–50 G: Matches standard ferrite or NdFeB fan magnets without signal conditioning.
Thermal Resistance θJA	208 °C/W: Validated for TO-94 package on typical PCB land pattern; enables passive thermal management in fan modules.
Locked-Rotor Response	1 s detection → 5 s off / 1 s on retry: Prevents cumulative junction temperature rise beyond safe limits during stall.
ESD Rating	6000 V HBM / 400 V MM: Meets industrial handling requirements without additional board-level protection.

Pinout & Package

The AH9280Z4-G1 is housed in a TO-94 metal can package (14.0–15.3 mm length, 4.98–5.28 mm width, 3.71–3.91 mm height), with Hall sensor die positioned centrally beneath the top surface for optimal magnetic coupling.

Pin/Terminal	Circuit Role	Design Meaning
1 - VCC	Positive supply input	Accepts 2.5–16 V DC; powers internal CMOS logic, Hall sensor, and gate drivers.
2 - DO	Phase 1 output driver	High-side N-channel MOSFET output; sinks current through coil 1 when active.
3 - DOB	Phase 2 output driver	Complementary high-side N-channel MOSFET output; drives coil 2 with 180° phase shift relative to DO.
4 - GND	Power and signal reference	Common return path for supply, Hall sensor bias, and output current; must be low-impedance.

Key Features

Feature	Design Value
Integrated Hall sensor	Eliminates external sensing components; BOP/BRP hysteresis (40 G) ensures robust commutation in noisy EMI environments.
Low start-up voltage	2.5 V minimum allows reliable fan startup even under brownout or aging PSU conditions.
Built-in clamping diodes	35 V zener-rated clamps on DO/DOB suppress inductive flyback, removing need for external TVS or freewheeling diodes.
Auto-restart locked-rotor protection	Prevents thermal runaway by limiting duty cycle during stall-no external watchdog or microcontroller required.
Green RoHS-compliant packaging	"G1" suffix denotes Pb-free, halogen-free TO-94 construction meeting JEDEC J-STD-020 reflow profiles.

Applications

PC & Server Cooling Fan

Power Supply Fan Control

Use Scenario: High-airflow axial fans in CPU coolers and 1U/2U server chassis requiring silent, reliable operation under variable thermal loads.

IC Role / Device Role / Timing Role: Two-phase BLDC commutator with Hall-based rotor position feedback and real-time stall recovery.

Use Value: Reduces component count by >6 discrete parts (transistors, resistors, diodes) versus discrete driver solutions while maintaining 125°C ambient rating.

Use Scenario: Forced-air cooling in ATX, SFX, or telecom rectifier PSUs where fan speed must scale with internal temperature and load.

IC Role / Device Role / Timing Role: Standalone fan driver with self-contained speed regulation logic and fault-safe shutdown.

Use Value: Enables fan operation down to 2.5 V supply-critical for PSUs with auxiliary rail instability during standby or overload.

Laptop Heat Sink Fan

Industrial Enclosure Ventilation

Use Scenario: Compact centrifugal fans in ultrabooks and thin-and-light notebooks where space and thermal headroom are constrained.

IC Role / Device Role / Timing Role: Dual-coil driver with integrated Hall sensing and low-V_CE(sat) MOSFETs minimizing self-heating.

Use Value: 600 mW max power dissipation and 208 °C/W θ_JA allow direct mounting on small PCBs without heatsinks.

Use Scenario: Dust-resistant blower fans in factory automation control cabinets exposed to wide ambient (-40 to 125°C) and vibration.

IC Role / Device Role / Timing Role: Ruggedized motor controller with ESD-hardened I/O (6 kV HBM) and magnetic immunity for harsh industrial settings.

Use Value: Eliminates external surge protection and filtering components, reducing BOM cost and failure points in long-life deployments.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ALLEGRO A3921KLPTR-T	Higher V_CC max (40 V), but requires external Hall sensor and external flyback diodes; no auto-restart logic.	Used in higher-voltage (>24 V) industrial blowers; lacks integrated stall recovery.	Select when system voltage exceeds 16 V or when discrete Hall placement is preferred for mechanical flexibility.
ON Semiconductor NCP1701ADR2G	Single-phase driver only; no Hall integration; relies on external back-EMF sensing; lower I_OUT (500 mA peak).	Targeted at low-cost, low-power 5 V fans where size and cost outweigh reliability requirements.	Choose only for non-critical, low-airflow applications where locked-rotor protection is handled externally.

Compared with A3921KLPTR-T and NCP1701ADR2G, the AH9280Z4-G1 uniquely combines Hall integration, dual-phase drive, auto-restart protection, and 125°C operation in one TO-94 package-reducing design complexity and improving field reliability in thermally demanding fan systems.

Availability

AH9280Z4-G1 is available at Aetrix Electronics and suitable for PC cooling, server thermal management, and power supply fan control requiring stable component supply, long-lifecycle support, and RoHS-compliant green packaging.

Supply support for AH9280Z4-G1 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

BCD Semiconductor Manufacturing Limited is a Shanghai-based analog and mixed-signal IC designer specializing in high-reliability power management and motor control solutions for computing, industrial, and automotive markets.

The AH9280 belongs to BCD's Smart Fan Driver product line, engineered specifically to replace multi-component discrete fan controllers with fully integrated, thermally robust, and ESD-hardened single-chip solutions for 5 V/12 V BLDC cooling systems.

FAQ

What is the minimum supply voltage required for AH9280Z4-G1 to start and sustain fan rotation?

The AH9280Z4-G1 has a guaranteed start-up voltage of 2.5 V, and it maintains normal commutation down to this level under nominal load. At 2.5 V, the device delivers reduced output current (≈300 mA peak) but retains full locked-rotor detection and auto-restart functionality. Operation below 2.5 V may result in incomplete Hall sensor activation or MOSFET gate underdrive.

Does AH9280Z4-G1 require external flyback diodes when driving inductive fan coils?

No. The AH9280Z4-G1 includes internal 35 V zener clamping diodes on both DO and DOB outputs, explicitly rated to absorb inductive energy from typical 5 V/12 V BLDC fan windings. External diodes are unnecessary unless coil inductance exceeds 10 mH or system-level EMI requirements mandate additional filtering.

How does the AH9280Z4-G1 detect and respond to a locked rotor condition?

The IC monitors Hall sensor transitions continuously. If no magnetic edge is detected for ≥1 second, it interprets this as rotor stall, disables both DO and DOB outputs for 5 seconds, then pulses them for 1 second to test for motion. This cycle repeats until valid Hall transitions resume, ensuring thermal safety without external intervention.

Can AH9280Z4-G1 drive fans with non-standard magnet pole counts or spacing?

Yes-the AH9280Z4-G1 responds to magnetic field polarity transitions, not absolute pole count. As long as the fan's magnet array produces clean, ≥20 G BOP/BRP differential at the Hall sensor location (within ±0.5 mm vertical tolerance), the IC will commutate correctly. Pole spacing affects timing resolution but not basic functionality.

AH9280Z4-G1 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: 4-SSIP

Packaging:: Bulk

Product Status:: Obsolete

Motor Type - Stepper:: -

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

Function:: Driver - Fully Integrated, Control and Power Stage

Output Configuration:: Low Side (2)

Interface:: On/Off

Technology:: CMOS, Power MOSFET

Step Resolution:: -

Applications:: Fan Motor Driver

Current - Output:: 600mA

Voltage - Supply:: 2.5V ~ 16V

Voltage - Load:: 2.5V ~ 16V

Operating Temperature:: -40°C ~ 125°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-94

AH9280Z4-G1 FAQ

1.How can I place an order for AH9280Z4-G1 through Aetrix?

Please submit a Request for Quotation (RFQ) for AH9280Z4-G1 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 AH9280Z4-G1 reliable?

The price and inventory of AH9280Z4-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AH9280Z4-G1 is usually 5 days.

3.What payment methods are accepted for AH9280Z4-G1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH9280Z4-G1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AH9280Z4-G1?

AH9280Z4-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AH9280Z4-G1 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 AH9280Z4-G1?

For technical support, including AH9280Z4-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH9280Z4-G1 requirements.

6.How does Aetrix verify that AH9280Z4-G1 is sourced from the original manufacturer or authorized distributors?

All AH9280Z4-G1 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 AH9280Z4-G1 meets industry standards.

7.What is the process for return or replacement of AH9280Z4-G1?

All AH9280Z4-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AH9280Z4-G1, 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 AH9280Z4-G1 part is unused and in its original packaging.

Return procedure for AH9280Z4-G1:

1.Submit a request within 90 days.

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

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