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

Diodes Incorporated AH9481M8TR-G1

Name: AH9481M8TR-G1
Brand: Diodes Incorporated
SKU: AH9481M8TR-G1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AH9481M8TR-G1

Manufacturer:: Diodes Incorporated

Category:: Motor Drivers, Controllers

Package:: 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)

Datasheet:: AH9481M8TR-G1.pdf

Description:: IC MOTOR DRIVER 2.5V-16V 8MSOP

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Product details

Overview

AH9481M8TR-G1 from BCD Semiconductor Manufacturing Limited is a single-phase, low-noise smart motor driver IC with integrated high-sensitivity Hall sensor and rotation detection (RD) output. It delivers full-bridge drive capability, soft-switching for acoustic noise reduction, locked rotor protection with auto-restart, and operates from 2.5V to 16V supply. Designed for compact BLDC cooling fans in notebooks and automotive climate control systems.

For engineers reviewing the AH9481M8TR-G1 datasheet, AH9481M8TR-G1 pinout, AH9481M8TR-G1 application, or AH9481M8TR-G1 equivalent, key selection criteria include RD alarm functionality, MSOP-8 thermal performance (θ_JA = 214°C/W), locked rotor timeout timing (t_ON = 0.4 s / t_OFF = 4 s), Hall magnetic thresholds (B_OP = 20 G typ), and integrated over-current/thermal shutdown protections.

Technical Context

The AH9481M8TR-G1 implements a Hall-effect-based commutation controller with latching sensor logic and dedicated RD open-drain output that asserts low during rotation and transitions high upon stall detection after ~0.4 s of no motion. Its full-bridge driver uses soft-switching to minimize voltage spikes and audible vibration.

Locked rotor recovery is fully autonomous: after entering protection mode, it cycles 0.4 s ON / 4 s OFF until rotation resumes. Thermal shutdown triggers at 175°C, and output stage features R_DS(ON) ≤ 3.3 Ω (combined) at 12 V and 300 mA, supporting continuous 300 mA drive into low-impedance coils.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage Range	2.5 V to 16 V - Enables direct operation from 3.3 V, 5 V, or 12 V rails without LDO.
Continuous Output Current	300 mA - Sustains drive for small BLDC fans up to ~1.5 W mechanical output.
RD Output Logic	Active-low rotation detection - Pulls low when motor spins; goes high after ~0.4 s stall for system-level fault signaling.
Locked Rotor Timing	t_ON = 0.4 s, t_OFF = 4 s - Limits average power dissipation during stall to prevent thermal damage.
Hall Operating Point	B_OP = 20 G (typ) - Detects standard ferrite magnet poles at air gaps ≤ 1.5 mm in fan assemblies.
Thermal Shutdown Threshold	175 °C - Protects die integrity under sustained overload or poor heatsinking in sealed enclosures.
Package Thermal Resistance	θ_JA = 214 °C/W (MSOP-8) - Supports >400 mW dissipation at TA = 85 °C with minimal PCB copper.

Pinout & Package

AH9481M8TR-G1 is housed in an MSOP-8 package (4.7 mm × 3.1 mm × 1.1 mm), optimized for space-constrained fan modules and automotive HVAC actuators. The exposed pad enhances thermal conduction to PCB ground plane.

Pin/Terminal	Circuit Role	Design Meaning
1, 8	NC	No internal connection - Must be left floating or tied to GND per layout best practice.
2	FG/RD	Open-drain rotation detection output - Requires external pull-up; sinks ≤10 mA when active low.
3, 5	GND	Power and signal reference ground - Dual pins reduce impedance and improve noise immunity.
4	OUT1	Full-bridge output 1 - Drives one side of single-coil BLDC motor; rated for 300 mA continuous.
6	OUT2	Full-bridge output 2 - Complementary drive terminal; pairs with OUT1 for H-bridge coil current reversal.
7	VCC	Positive supply input - Decoupling capacitor (≥1 µF ceramic) required within 3 mm of pin.

Key Features

Feature	Design Value
Integrated Hall Sensor	High-sensitivity latching type with B_OP/B_RP hysteresis (40 G) - Eliminates need for external sensor and reduces BOM count by 2–3 components.
Soft-Switching Commutation	Controlled slew rate on OUT1/OUT2 edges - Reduces EMI and audible coil whine below 20 kHz in 5 V/12 V fans.
Auto-Restart Locked Rotor Protection	Self-timed 0.4 s ON / 4 s OFF cycling - Prevents thermal runaway while enabling automatic recovery without MCU intervention.
Output Stage Protection	Combined over-current, short-circuit, and thermal shutdown - Trips before bond wire fusing; resets automatically after cooldown.
Rotation Detection (RD) Output	Dedicated open-drain alarm signal - Provides direct interface to microcontroller GPIO or supervisor IC for fan health monitoring.

Applications

Notebook DC Cooling Fan

Automotive Climate Control Fan

Use Scenario: Low-profile axial fan (<10 mm height) in ultrabook thermal module, operating from 5 V rail.

IC Role / Device Role / Timing Role: Single-chip motor controller providing Hall-based commutation, rotation feedback (RD), and stall protection.

Use Value: Enables fan speed regulation via PWM on VCC while RD signal confirms operational status to EC firmware without additional sensing circuitry.

Use Scenario: Blower motor in HVAC duct assembly, exposed to -40°C to 85°C ambient with vibration.

IC Role / Device Role / Timing Role: Smart driver with integrated Hall sensor and auto-restart - replaces discrete driver + comparator + timer solution.

Use Value: RD output triggers HVAC controller fault log on stall; soft-switching meets automotive EMC Class 3 limits for cabin noise.

5 V Low-Noise Server Fan

Micro-Motor Actuator

Use Scenario: 40 mm × 40 mm × 10 mm server chassis fan requiring <25 dB(A) acoustic output at full speed.

IC Role / Device Role / Timing Role: Full-bridge driver with soft-switching and Hall latching for precise pole alignment.

Use Value: Reduces high-frequency switching harmonics by >15 dB vs. hard-switched drivers, meeting datacenter acoustic specifications.

Use Scenario: Precision 8 mm diameter micro-BLDC motor in medical fluid pump, powered from 3.3 V battery.

IC Role / Device Role / Timing Role: Motor controller with ultra-low V_CC(min) = 2.5 V and low ICC (4.3 mA typ) for extended runtime.

Use Value: Enables direct battery operation without boost converter; RD signal validates pump priming and flow initiation.

Equivalent & Alternatives

The following parts are listed as comparable options for similar single-phase BLDC motor control applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
ALLEGRO A3920KLPTR-T	TO-220-15 package; higher I_OUT (1 A); no integrated Hall sensor - requires external latch.	Targeted at higher-power (>3 W) industrial blowers; lacks RD alarm output.	Select when coil resistance <5 Ω and external Hall placement is acceptable; not drop-in for AH9481 footprint.
ON Semiconductor NCV7703BDR2G	SOIC-16; dual half-bridge; no Hall integration; SPI-configurable diagnostics.	Designed for multi-motor automotive clusters; requires MCU for commutation logic and stall detection.	Choose for systems needing programmable fault reporting and multi-channel coordination - adds software complexity but improves flexibility.

Compared with A3920KLPTR-T and NCV7703BDR2G, AH9481M8TR-G1 offers the only monolithic MSOP-8 solution with embedded Hall sensor, RD alarm, and autonomous locked-rotor recovery - reducing PCB area by >40% and eliminating 3–5 external components in fan applications.

Availability

AH9481M8TR-G1 is available at Aetrix Electronics and suitable for notebook cooling fans, automotive HVAC blowers, 5 V server fans, and micro-motor actuators requiring stable component supply across industrial and automotive temperature ranges (-40°C to +85°C).

Supply support for AH9481M8TR-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 power IC design house specializing in high-reliability motor drivers, LED controllers, and power management solutions for consumer, computing, and automotive markets.

AH9481M8TR-G1 belongs to BCD's AH94xx smart motor driver family, engineered specifically for cost-sensitive, space-constrained BLDC fan applications where integration, low noise, and autonomous fault handling are critical.

FAQ

What is the function of the RD pin on AH9481M8TR-G1?

The RD (Rotation Detection) pin is an open-drain output that actively pulls low when the motor rotates and transitions high after approximately 0.4 seconds of no motion, indicating a locked rotor condition. It requires an external pull-up resistor (typically 4.7 kΩ to VCC) and sinks up to 10 mA. This signal enables host systems to monitor fan health without additional sensors or firmware polling.

Can AH9481M8TR-G1 drive a 24 V motor?

No. AH9481M8TR-G1 has an absolute maximum VCC rating of 18 V and recommended operating range of 2.5 V to 16 V. Applying 24 V exceeds its voltage tolerance and will cause permanent damage. For 24 V BLDC fans, consider discrete gate drivers with external Hall sensors or higher-voltage motor ICs like the STSPIN250.

How does the soft-switching feature reduce acoustic noise?

Soft-switching controls the slew rate of OUT1 and OUT2 voltage transitions during commutation, limiting dV/dt to suppress high-frequency ringing and electromagnetic interference. This eliminates ultrasonic excitation of motor laminations and coil windings, reducing audible whine below 20 kHz - critical for quiet environments like medical devices and premium notebooks.

Is the MSOP-8 package of AH9481M8TR-G1 RoHS compliant?

Yes. The "G1" suffix in AH9481M8TR-G1 explicitly denotes BCD Semiconductor's green, lead-free, RoHS-compliant packaging. The MSOP-8 body uses matte tin plating, halogen-free molding compound, and meets JEDEC J-STD-020 moisture sensitivity level MSL3 (floor life = 168 hours at 30°C/60% RH).

AH9481M8TR-G1 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Motor Type - Stepper:: -

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

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

Output Configuration:: Half Bridge (2)

Interface:: On/Off

Technology:: Power MOSFET

Step Resolution:: -

Applications:: Fan Motor Driver

Current - Output:: 300mA

Voltage - Supply:: 2.5V ~ 16V

Voltage - Load:: 2.5V ~ 16V

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-MSOP

AH9481M8TR-G1 FAQ

1.How can I place an order for AH9481M8TR-G1 through Aetrix?

Please submit a Request for Quotation (RFQ) for AH9481M8TR-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 AH9481M8TR-G1 reliable?

The price and inventory of AH9481M8TR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AH9481M8TR-G1 is usually 5 days.

3.What payment methods are accepted for AH9481M8TR-G1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH9481M8TR-G1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AH9481M8TR-G1?

AH9481M8TR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AH9481M8TR-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 AH9481M8TR-G1?

For technical support, including AH9481M8TR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH9481M8TR-G1 requirements.

6.How does Aetrix verify that AH9481M8TR-G1 is sourced from the original manufacturer or authorized distributors?

All AH9481M8TR-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 AH9481M8TR-G1 meets industry standards.

7.What is the process for return or replacement of AH9481M8TR-G1?

All AH9481M8TR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AH9481M8TR-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 AH9481M8TR-G1 part is unused and in its original packaging.

Return procedure for AH9481M8TR-G1:

1.Submit a request within 90 days.

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

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