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Diodes Incorporated AH9485-WUF-7
- Part No.:
- AH9485-WUF-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Motor Drivers, Controllers
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
AH9485-WUF-7.pdf
- Description:
- IC MOTOR DRIVER 2V-6V 6TSOT26F
- Quantity:
- Payment:
- Shipping:
Inventory:2,986
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Product details
Overview
AH9485-WUF-7 from Diodes Incorporated is a single-phase brushless DC motor driver IC integrating a full-bridge power stage, high-sensitivity Hall-effect sensor, rotor lock detection, auto-restart, thermal shutdown, and open-drain FG tachometer output. It operates from 2V–6V supply, delivers up to 300mA continuous output current, and uses soft-switching to suppress audible noise and EMI-designed for low-noise 5V cooling fans in notebooks and VGA modules.
For engineers reviewing the AH9485-WUF-7 datasheet, AH9485-WUF-7 pinout, AH9485-WUF-7 application, or AH9485-WUF-7 equivalent, key selection criteria include integrated Hall sensing, FG output functionality (vs. RD on AH9486), soft-switching noise reduction, rotor lock protection timing (tON = 0.25s, tOFF = 1.5s), and TSOT26F package compatibility with space-constrained fan PCB layouts.
Technical Context
The AH9485-WUF-7 implements a closed-loop commutation system using an on-chip Hall sensor with BOP = 25G (typ) and BRP = −25G (typ), enabling precise rotor position detection without external components. Its digital control logic drives the full-bridge outputs (OUT1/OUT2) with soft-switching waveforms to limit dI/dt and reduce acoustic vibration.
Speed control is supported via either DC voltage (0.14×VDD to 0.5×VDD) or external PWM input (200Hz–30kHz+), while FG output provides frequency-proportional tach feedback referenced to magnetic transitions. Thermal protection triggers at junction temperatures exceeding safe operating limits, with θJA = 141°C/W.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2V to 6V - supports direct 3.3V/5V rail operation without LDO; absolute max 7V transient only |
| Continuous Output Current | 300mA - sufficient for micro-fans and low-power BLDC motors up to ~1W mechanical output |
| RDS(ON) (Total) | 2Ω (typ) at 25°C - enables <150mW conduction loss at 300mA, critical for thermal management in sealed fans |
| FG Output Type | Open-drain - requires external pull-up; frequency tracks magnetic pole transitions for accurate RPM monitoring |
| Operating Temperature | −40°C to +105°C - qualified for industrial and computing environments including GPU cooling zones |
| Lock-Detect Timing | tON = 0.25s, tOFF = 1.5s - ensures rapid shutdown before coil overheating, then safe restart after obstruction removal |
| Soft-Switching Benefit | Reduces audible noise & EMI - eliminates high-frequency ringing during commutation, meeting Class B EMC requirements |
Pinout & Package
Package: TSOT26F - flat-pin, 6-lead, 2.9mm × 3.8mm × 0.75mm profile optimized for thin-profile fan PCBs with minimal board area usage.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (FG/RD) | Tachometer output (AH9485) | Open-drain FG signal pulses per magnetic transition; requires external pull-up for logic-level interface to MCU or fan controller |
| 2 (GND) | Power ground reference | Common return path for motor current, Hall sensor, and internal logic; must be low-impedance and thermally coupled to PCB copper pour |
| 3 (OUT1) | Full-bridge high-side output | Drives one end of motor coil; paired with OUT2 to form H-bridge; rated for 300mA continuous, 500mA peak |
| 4 (OUT2) | Full-bridge low-side output | Drives opposite end of motor coil; complements OUT1; shares same RDS(ON) and thermal derating behavior |
| 5 (PWM) | Speed control input | Accepts DC voltage (0.14–0.5×VDD) or external PWM (≥30kHz recommended); internal pull-up enables full-speed default when floating |
| 6 (VDD) | Positive supply input | 2–6V nominal; requires local 2.2μF ceramic decoupling capacitor placed adjacent to pin per datasheet layout guidance |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Hall Sensor | Eliminates need for external sensor and signal conditioning circuitry-reduces BOM count by ≥4 components and saves ≥3mm² PCB area |
| Soft-Switching Commutation | Minimizes dv/dt and di/dt transients-reducing radiated EMI by >10dB and eliminating audible coil whine in sensitive audio/computing applications |
| Rotor Lock Protection | Detects stalled condition within 250ms and shuts down bridge; auto-restarts after 1.5s timeout-prevents thermal runaway without host intervention |
| FG Tachometer Output | Provides real-time speed feedback proportional to motor RPM-enables closed-loop fan control in systems lacking dedicated tach inputs |
| TSOT26F Package | 0.75mm height and flat leads enable ultra-thin fan assemblies (<8mm total height) and simplify automated optical inspection (AOI) during SMT |
Applications
| 5V Notebook Cooling Fan | VGA GPU Blower Module |
|---|---|
|
Use Scenario: High-efficiency, low-noise airflow generation inside ultrabooks with strict acoustic limits (<25 dBA). IC Role / Device Role / Timing Role: Single-chip BLDC driver with integrated Hall sensing and FG feedback-replaces discrete driver + sensor + logic solution. Use Value: Soft-switching reduces audible noise by >15dB vs. hard-switched drivers; FG output enables dynamic thermal throttling via host CPU PWM control. |
Use Scenario: Compact axial blower delivering directed airflow over GPU die and VRMs in gaming laptops. IC Role / Device Role / Timing Role: Motor controller providing stall-safe operation and real-time RPM telemetry under variable thermal load. Use Value: Rotor lock detection prevents burnout during dust-clogged operation; 105°C rating ensures reliability near hot GPU zones. |
| Low-Power DC Fan for Embedded Systems | Micro-BLDC Actuator in Medical Devices |
|
Use Scenario: Fan for industrial HMIs or network edge devices requiring silent operation and long-life reliability. IC Role / Device Role / Timing Role: Integrated motor driver with thermal shutdown and auto-restart-enables unattended 24/7 operation. Use Value: 2V–6V supply range allows direct use of Li-ion battery or USB-powered rails; RoHS/Green compliance meets medical/industrial certifications. |
Use Scenario: Precision airflow control in portable diagnostic equipment where EMI must not interfere with analog sensor signals. IC Role / Device Role / Timing Role: Low-EMI BLDC driver with clean commutation and isolated FG feedback-minimizes coupling into sensitive front-end circuits. Use Value: Soft-switching reduces broadband EMI by >12dB in 30–100MHz band; TSOT26F package supports compact, shielded module design. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar single-phase BLDC motor driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ALLEGRO A4964KJPTR-T | Requires external Hall sensor; no integrated FG output; higher VDD min = 4.5V; RDS(ON) = 0.8Ω (lower loss but less noise control) | Lacks on-chip tach feedback and rotor lock auto-restart-requires external MCU supervision for safety functions | Select if lower conduction loss is prioritized over acoustic noise and system integration simplicity |
| ON Semiconductor NCP170B | Not a motor driver-only a linear regulator; incompatible function; included only as common mis-selection due to part number similarity | No motor control capability; cannot replace AH9485-WUF-7 in any BLDC application | Avoid-functional mismatch; verify part number prefix "AH" denoting Diodes' motor driver family |
Compared with A4964KJPTR-T, AH9485-WUF-7 reduces system component count by integrating Hall sensing and FG output, while its soft-switching provides superior acoustic performance in noise-sensitive applications; unlike NCP170B, it is a complete motor control SoC-not a power management IC.
Availability
AH9485-WUF-7 is available at Aetrix Electronics and suitable for notebook cooling fans, GPU blowers, embedded system thermal management, and medical micro-actuators requiring stable component supply across multi-year production cycles.
Supply support for AH9485-WUF-7 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 power management, signal integrity, and motor control solutions for computing, industrial, and consumer markets.
AH9485-WUF-7 belongs to Diodes' Smart Motor Driver product line-designed specifically for cost-sensitive, space-constrained BLDC applications requiring integrated sensing, protection, and low-noise operation without external controllers.
FAQ
What is the functional difference between AH9485-WUF-7 and AH9486-WUF-7?
AH9485-WUF-7 provides an open-drain FG (tachometer) output that pulses per magnetic transition, enabling RPM measurement. AH9486-WUF-7 substitutes this with an RD (rotor lock alarm) output that pulls low during stall conditions. Both share identical driver architecture, Hall sensor, soft-switching, and protection features-only the pin 1 function differs.
Can AH9485-WUF-7 drive a motor directly from a 3.3V supply?
Yes-AH9485-WUF-7 operates across 2V–6V, so 3.3V is fully supported. At 3.3V, typical supply current is ~2.2mA, RDS(ON) increases slightly (~2.3Ω), and FG output frequency scales linearly with motor speed. Ensure PWM input thresholds (0.14×VDD ≈ 0.46V, 0.5×VDD ≈ 1.65V) are met by the control source.
Is external decoupling capacitor mandatory, and what value is required?
Yes-a 2.2μF ceramic capacitor is mandatory between VDD and GND, placed as close as possible to pins 6 and 2. This stabilizes the internal bias generator and Hall amplifier during commutation transients. Omitting it causes erratic Hall detection, false lock detection, or startup failure per datasheet Note 4.
Does AH9485-WUF-7 support bidirectional motor rotation?
No-AH9485-WUF-7 is designed for unidirectional single-phase BLDC operation only. Its internal commutation logic and Hall polarity detection are fixed for one rotational direction. Reversal requires external hardware modification (e.g., magnet polarity flip) and is not supported by the IC's control architecture.
AH9485-WUF-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOT-23-6 Thin, TSOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Last Time Buy
- Motor Type - Stepper:
- -
- Motor Type - AC, DC:
- Brushless DC (BLDC)
- Function:
- Driver - Fully Integrated, Control and Power Stage
- Output Configuration:
- Half Bridge (2)
- Interface:
- PWM
- Technology:
- Power MOSFET
- Step Resolution:
- -
- Applications:
- Fan Motor Driver
- Current - Output:
- 300mA
- Voltage - Supply:
- 2V ~ 6V
- Voltage - Load:
- 2V ~ 6V
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-26F
AH9485-WUF-7 FAQ
1.How can I place an order for AH9485-WUF-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AH9485-WUF-7 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 AH9485-WUF-7 reliable?
The price and inventory of AH9485-WUF-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AH9485-WUF-7 is usually 5 days.
3.What payment methods are accepted for AH9485-WUF-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH9485-WUF-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH9485-WUF-7?
AH9485-WUF-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH9485-WUF-7 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 AH9485-WUF-7?
For technical support, including AH9485-WUF-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH9485-WUF-7 requirements.
6.How does Aetrix verify that AH9485-WUF-7 is sourced from the original manufacturer or authorized distributors?
All AH9485-WUF-7 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 AH9485-WUF-7 meets industry standards.
7.What is the process for return or replacement of AH9485-WUF-7?
All AH9485-WUF-7 units undergo pre-shipment inspection (PSI). If there is an issue with AH9485-WUF-7, 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 AH9485-WUF-7 part is unused and in its original packaging.
Return procedure for AH9485-WUF-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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