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Diodes Incorporated AH9279Z4-G1
- Part No.:
- AH9279Z4-G1
- Manufacturer:
- Diodes Incorporated
- Category:
- Motor Drivers, Controllers
- Package:
- 4-SSIP
- Datasheet:
-
AH9279Z4-G1.pdf
- Description:
- IC MOTOR DRIVER 3.5V-16V TO94
- Quantity:
- Payment:
- Shipping:
Inventory:3,941
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Product details
Overview
AH9279Z4-G1 from BCD Semiconductor Manufacturing Limited is a two-phase dual-coil CMOS smart fan motor driver IC with integrated Hall sensor, locked rotor detection, auto-restart logic, and dual MOSFET output drivers in TO-94 package. It delivers 500 mA output current, operates from 3.5 V to 16 V, and supports ambient temperatures up to 125°C for brushless DC fan control in server cooling systems.
For engineers reviewing the AH9279Z4-G1 datasheet, AH9279Z4-G1 pinout, AH9279Z4-G1 application, or AH9279Z4-G1 equivalent, key selection criteria include its built-in locked rotor protection timing (5 s OFF / 1 s restart), Hall magnetic sensitivity (BOP: 25–50 G), saturation voltage (600–1000 mV at 350 mA), thermal resistance (θJA = 227 °C/W), and RoHS-compliant green packaging (G1 suffix).
Technical Context
The AH9279Z4-G1 integrates a Hall sensor, signal amplifier, wave shaper, and dual-channel output drive circuit to commutate two-phase BLDC fans without external controllers. Its internal locked rotor detector monitors rotation absence for ≥1 s, then initiates a defined fault sequence: 5 s output disable, followed by 1 s single-channel drive attempt.
It features on-chip Zener diode protection (35 V breakdown) on both DO and DOB outputs, CMOS logic-level compatibility, and thermal shutdown behavior governed by junction-to-ambient thermal resistance (227 °C/W) and power dissipation limit (550 mW). Operation is validated across –20°C to +125°C ambient range with supply voltage from 3.5 V to 16 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3.5 V to 16 V - Enables direct use with 5 V or 12 V fan power rails without regulation. |
| Continuous Output Current | 500 mA - Sufficient to drive typical 40–80 mm dual-coil BLDC fans at full speed. |
| Saturation Voltage | 600–1000 mV at 350 mA - Limits conduction loss and self-heating under load. |
| Locked Rotor Response | 1 s detection delay → 5 s disable → 1 s restart pulse - Prevents thermal damage during stall conditions. |
| Magnetic Sensitivity | BOP: 25–50 G, BRP: –50 to –25 G - Ensures reliable commutation with standard fan-mounted magnets. |
| Thermal Resistance θJA | 227 °C/W - Defines maximum ambient temperature (125°C) at ≤100 mW drive power. |
| ESD Rating | 4000 V HBM / 400 V MM - Supports handling and board assembly without special ESD controls. |
Pinout & Package
Package: TO-94, 4-pin metal can with center tab (non-isolated), lead-free and RoHS-compliant (G1 suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: VCC | Positive supply input | Accepts 3.5–16 V DC; powers internal regulator, Hall sensor, and logic blocks. |
| 2: DO | Phase 1 output driver | High-side N-channel MOSFET output; sinks current into coil 1 when active. |
| 3: DOB | Phase 2 output driver | High-side N-channel MOSFET output; sinks current into coil 2 when active. |
| 4: GND | Ground reference | Common return path for supply, Hall bias, and output current; must be low-impedance. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Hall sensor | Eliminates need for external magnetic sensing components; enables compact, single-IC fan commutation. |
| Locked rotor auto-restart | Defined 5 s OFF / 1 s restart cycle prevents thermal runaway while preserving fan usability after obstruction clears. |
| Zener-protected outputs | 35 V breakdown on DO/DOB pins suppresses inductive kickback from fan coils without external TVS diodes. |
| Wide temperature operation | Rated for –20°C to +125°C ambient, enabling deployment in high-heat server chassis and industrial enclosures. |
| Low quiescent current | 3.5–5 mA typical supply current reduces standby power draw in always-on cooling systems. |
Applications
| Server Rack Cooling Fan | Industrial PLC Cabinet Fan |
|---|---|
Use Scenario: Continuous forced-air cooling of 1U–4U rack-mounted servers with variable thermal load. IC Role / Device Role / Timing Role: Dual-phase BLDC commutator and stall protector; replaces discrete Hall + driver solutions. Use Value: Eliminates external Hall sensors and gate drivers; reduces BOM count by ≥4 components per fan channel. | Use Scenario: Convection-assisted airflow management inside sealed programmable logic controller cabinets operating at 70°C ambient. IC Role / Device Role / Timing Role: Smart fan controller with automatic restart after dust-induced rotor lock. Use Value: Maintains cooling integrity without manual intervention; avoids thermal shutdown of critical control hardware. |
| Telecom Base Station Chassis Fan | Medical Imaging Power Supply Fan |
Use Scenario: Redundant cooling for high-power RF amplifiers in outdoor telecom base stations exposed to wide temperature swings. IC Role / Device Role / Timing Role: Fault-resilient motor driver with magnetic commutation and thermal-aware operation. Use Value: Sustains fan operation down to –20°C cold start and up to 125°C case temperature under full load. | Use Scenario: Low-noise, reliable airflow for liquid-cooled MRI or CT power supply modules requiring zero downtime. IC Role / Device Role / Timing Role: Safety-critical fan driver with locked rotor detection and restart to prevent overheating-induced system failure. Use Value: Meets IEC 60601-1 auxiliary equipment reliability requirements via deterministic fault recovery behavior. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-coil BLDC fan driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ALLEGRO A3977SLBTR-T | Microstepping stepper driver; no integrated Hall sensor; requires external position feedback. | Designed for precision positioning, not continuous BLDC fan rotation. | Select only if replacing stepper-based cooling systems with open-loop control. |
| ON Semiconductor NCP5425DR2G | Single-channel fan controller with tach feedback; lacks dual-phase drive and Hall integration. | Supports only unidirectional fans with RPM monitoring, not bidirectional BLDC commutation. | Choose when fan speed regulation is prioritized over stall recovery and magnetic commutation. |
Compared with A3977SLBTR-T and NCP5425DR2G, the AH9279Z4-G1 uniquely combines Hall sensing, dual-phase drive, and autonomous locked rotor recovery in one TO-94 package-enabling simpler, more robust fan control where magnetic commutation and fault resilience are mandatory.
Availability
AH9279Z4-G1 is available at Aetrix Electronics and suitable for server rack cooling, industrial PLC cabinet ventilation, and telecom base station thermal management requiring stable component supply and long-lifecycle support.
Supply support for AH9279Z4-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 and foundry partner, specializing in high-reliability power management and motor control solutions for industrial and computing markets.
The AH9279 belongs to BCD's Smart Fan Driver product line, engineered specifically for cost-sensitive, thermally demanding BLDC fan applications where integration, fault tolerance, and extended temperature operation are essential.
FAQ
What is the function of the DOB pin on the AH9279Z4-G1?
DOB (Pin 3) is the second high-side MOSFET output driver terminal, delivering controlled current to coil 2 of a two-phase BLDC fan. It operates complementarily with DO (Pin 2) under Hall sensor feedback to enable electronic commutation. Its 35 V Zener protection clamps inductive flyback voltage during switching transitions.
Can the AH9279Z4-G1 operate from a 3.3 V supply?
No. The AH9279Z4-G1 has a minimum recommended supply voltage of 3.5 V and absolute minimum of 3.5 V per datasheet Section 4 (Recommended Operating Conditions). At 3.3 V, internal voltage references and Hall sensor biasing fall outside specification, resulting in unreliable commutation or failure to start.
How does the locked rotor protection behave at elevated ambient temperature?
The locked rotor detection and restart sequence remains fully functional from –20°C to +125°C ambient. However, sustained operation above 100°C requires limiting drive power to ≤100 mW (or output current <200 mA) to maintain junction temperature within safe limits given θJA = 227 °C/W.
Is external capacitor C1 required in the AH9279Z4-G1 application circuit?
Yes. C1 (2.2 µF electrolytic, per Figure 14) is mandatory for VCC decoupling and noise suppression. It stabilizes the internal voltage reference and Hall sensor bias under dynamic load transients. Omission causes erratic commutation, false locked rotor triggers, or premature thermal shutdown.
AH9279Z4-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:
- 500mA
- Voltage - Supply:
- 3.5V ~ 16V
- Voltage - Load:
- 3.5V ~ 16V
- Operating Temperature:
- -20°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-94
AH9279Z4-G1 FAQ
1.How can I place an order for AH9279Z4-G1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AH9279Z4-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 AH9279Z4-G1 reliable?
The price and inventory of AH9279Z4-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AH9279Z4-G1 is usually 5 days.
3.What payment methods are accepted for AH9279Z4-G1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH9279Z4-G1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH9279Z4-G1?
AH9279Z4-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH9279Z4-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 AH9279Z4-G1?
For technical support, including AH9279Z4-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH9279Z4-G1 requirements.
6.How does Aetrix verify that AH9279Z4-G1 is sourced from the original manufacturer or authorized distributors?
All AH9279Z4-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 AH9279Z4-G1 meets industry standards.
7.What is the process for return or replacement of AH9279Z4-G1?
All AH9279Z4-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AH9279Z4-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 AH9279Z4-G1 part is unused and in its original packaging.
Return procedure for AH9279Z4-G1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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