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Diodes Incorporated AH5795-WU-7
- Part No.:
- AH5795-WU-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Motor Drivers, Controllers
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
AH5795-WU-7.pdf
- Description:
- IC MOTOR DRIVER 1.8V-6V TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,026
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Product details
Overview
AH5795-WU-7 from Diodes Incorporated is a single-phase Hall-effect latch fan motor driver IC integrating a Hall sensor, amplifier, and full-bridge output stage for single-coil BLDC fans. It operates from 1.8V to 6V, delivers up to 1000mA peak output current, and features rotor lock protection with automatic restart, thermal shutdown at 175°C, and open-drain FG tachometer output synchronized to magnetic change frequency - used in 3.3V/5V cooling fans for notebooks and instrumentation.
For engineers reviewing the AH5795-WU-7 datasheet, AH5795-WU-7 pinout, AH5795-WU-7 application, or AH5795-WU-7 equivalent, key selection criteria include soft-switching EMI reduction, dual speed control (PWM input or Vdd modulation), FG output timing alignment with rotor position, and TSOT23-6 package compatibility with space-constrained thermal designs.
Technical Context
The AH5795 implements a Hall-latch-based commutation controller with integrated full-bridge driver and logic block that detects magnetic polarity transitions to sequence O1/O2 outputs. Its soft-switching architecture limits dV/dt to ~200 µs per edge, reducing audible noise and conducted EMI in fan applications.
Functional operation includes lock detection via stalled FG signal or abnormal O1/O2 duty ratio, triggering output disable and automatic re-start after removal of mechanical obstruction. The FG output is open-drain with 5 µA leakage and 0.4 V low-level voltage at 5 mA sink, requiring an external 10 kΩ pull-up.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.8 V to 6.0 V - Enables direct interface with 3.3 V and 5 V system rails without level-shifting. |
| Peak Output Current | 1000 mA - Sufficient to drive typical 30 mm–60 mm single-coil BLDC fans at full speed. |
| FG Output Type | Open-drain, magnetic-change-synchronized - Provides accurate RPM feedback without internal clock dependency. |
| Thermal Shutdown Threshold | 175 °C with 25 °C hysteresis - Prevents permanent damage during sustained overload or poor PCB heat sinking. |
| Soft-Switching Edge Rate | 200 µs typical transition - Reduces high-frequency EMI emissions below CISPR-22 Class B limits. |
| Rotor Lock Detection Timeout | 65 ms FG stall or PWM low duration - Ensures fast response to jammed fan blades while avoiding false triggers during startup. |
| Operating Ambient Range | −40 °C to +105 °C - Validated for industrial and computing thermal environments including laptop chassis hotspots. |
Pinout & Package
Package: TSOT23-6 - 1.95 mm × 2.075 mm × 0.9 mm low-profile surface-mount package with exposed pad (thermal pad not electrically connected), optimized for compact fan control modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Vdd | Positive power supply input | Bias source for internal circuitry and motor coil drive; also serves as speed control reference when PWM pin is tied to Vdd. |
| Vss | Ground reference | Common return path for logic, Hall sensor, and full-bridge driver; must be low-impedance for stable commutation. |
| O1 | Full-bridge output 1 | Active-low sinking/driver terminal; alternates with O2 under Hall polarity detection to energize motor coil in correct direction. |
| O2 | Full-bridge output 2 | Complementary full-bridge output; commutates with O1 to sustain unidirectional rotation in single-coil BLDC topology. |
| PWM | Speed control input | Accepts 0.02–50 kHz PWM signal; duty cycle directly modulates average coil current and fan speed; >65 ms low disables outputs. |
| FG | Frequency generator output | Open-drain tachometer output pulsing at magnetic pole transition rate; requires external 10 kΩ pull-up to Vdd for logic-level interface. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Hall sensor + amplifier | Eliminates need for external magnetic sensing components; operates across full 1.8–6 V supply range with 10–50 G operate point. |
| Dual speed control modes | Supports either Vdd-voltage scaling (36%–100% speed at 1.8–5 V) or PWM-input linear control (20%–100% duty → proportional RPM). |
| Rotor lock protection with auto-restart | Detects stalled condition via FG stall or asymmetric O1/O2 timing, shuts down outputs, and resumes drive after mechanical clearance. |
| No external timing capacitor required | Reduces BOM count and PCB area; all timing (Toff clear, lock detection, soft-switching) is internally generated and temperature-compensated. |
| Soft-switching commutation | Controls dV/dt on O1/O2 edges to limit radiated EMI and eliminate audible coil whine in quiet-system applications like medical instruments. |
Applications
| Laptop Cooling Fan Control | Industrial Instrumentation Fan |
|---|---|
|
Use Scenario: Regulating airflow in ultra-thin notebook chassis where acoustic noise and EMI must remain below user-perceptible thresholds. IC Role / Device Role / Timing Role: Hall-latch commutator and full-bridge driver; FG output provides closed-loop speed verification to system EC firmware. Use Value: Soft switching reduces 2–20 kHz audible noise by >15 dB; dual-speed control enables dynamic thermal throttling without external DAC or regulator. |
Use Scenario: Maintaining stable airflow over precision analog circuitry in laboratory-grade multimeters and oscilloscopes. IC Role / Device Role / Timing Role: Single-chip motor controller with rotor lock detection; FG signal feeds into microcontroller for real-time fan health monitoring. Use Value: −40°C to +105°C operation ensures reliability in unventilated enclosures; thermal shutdown prevents device failure during extended calibration cycles. |
| Low-Voltage Server Fan Module | Medical Diagnostic Equipment Cooling |
|
Use Scenario: Driving 5 V BLDC fans in 1U rack-mounted servers where board space is constrained and supply rail sharing is common. IC Role / Device Role / Timing Role: Compact TSOT23-6 motor driver with integrated Hall sensor; eliminates discrete Hall IC and gate drivers. Use Value: 1.8 V minimum Vdd allows coexistence with 3.3 V I²C bus controllers; 3000-unit tape-and-reel packaging supports automated SMT assembly. |
Use Scenario: Active cooling of X-ray detector ASICs and MRI gradient amplifiers where fan failure must trigger immediate system alert. IC Role / Device Role / Timing Role: Fault-tolerant fan driver with automatic restart and FG-based speed validation; meets IEC 60601-1 auxiliary power safety requirements. Use Value: Rotor lock detection + FG monitoring enables fail-safe behavior without host intervention; RoHS-compliant "green" molding compound satisfies medical material traceability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar single-phase Hall-effect BLDC fan driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AH9485 | Higher Vdd max (7 V), no FG output, fixed 25 kHz internal oscillator instead of PWM input | Suitable for cost-sensitive fixed-speed fans; lacks tach feedback and programmable speed control | Select AH9485 only if FG monitoring and variable-speed control are unnecessary and supply may exceed 6 V. |
| DRV10970 | Three-phase driver with external Hall sensors, 12 V max, integrated current sense, no rotor lock auto-restart | Designed for higher-power multi-coil fans; requires external magnetics and more complex layout | Choose DRV10970 only for >1 W fan loads or when three-phase torque ripple reduction is mandatory. |
Compared with AH9485 and DRV10970, the AH5795-WU-7 uniquely combines integrated Hall sensing, FG tach output, dual-speed control, and auto-restart rotor lock protection in a 6-pin TSOT23 package - making it optimal for compact, intelligent, low-noise single-coil fan systems requiring diagnostics and field-serviceability.
Availability
AH5795-WU-7 is available at Aetrix Electronics and suitable for laptop cooling fan control, industrial instrumentation fan management, and low-voltage server fan modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.
Supply support for AH5795-WU-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 precision analog solutions for industrial, computing, and consumer markets.
The AH5795 belongs to Diodes' fan motor driver product line, engineered specifically for low-noise, single-coil BLDC fan control in space-constrained thermal management systems - emphasizing integration, reliability, and EMI compliance.
FAQ
What is the function of the FG pin on the AH5795-WU-7?
The FG (Frequency Generator) pin is an open-drain output that pulses at the same frequency as magnetic pole transitions sensed by the internal Hall element. It provides real-time motor RPM feedback and requires a 10 kΩ external pull-up resistor to Vdd. Its low-level voltage is guaranteed ≤0.4 V at 5 mA sink current, enabling direct interface with 3.3 V or 5 V microcontrollers.
Can the AH5795-WU-7 drive a 12 V fan?
No. The AH5795-WU-7 has an absolute maximum Vdd rating of 7 V and recommended operating range of 1.8 V to 6.0 V. Applying 12 V will cause permanent damage. It is designed exclusively for low-voltage BLDC fans - typically rated for 3.3 V or 5 V operation - and must be powered within its specified supply range.
How does rotor lock protection work on the AH5795-WU-7?
Rotor lock is detected when the FG output stalls or when the PWM input remains low for longer than 65 ms. Upon detection, the full-bridge outputs (O1/O2) are disabled. Once the mechanical obstruction is removed and FG resumes pulsing or PWM goes high again, the device automatically re-starts motor commutation without external reset.
Is the TSOT23-6 package thermally adequate for continuous 1000 mA operation?
At 25°C ambient, the TSOT23-6 package supports 650 mW power dissipation, corresponding to ~650 mA at 1 V saturation drop. For 1000 mA peak loads, thermal derating is required: maximum continuous current drops to ~313 mA at 100°C ambient. Use DFN2020C-6 for higher sustained current or add copper pour and minimize trace resistance to improve thermal performance.
AH5795-WU-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:
- 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:
- PWM
- Technology:
- Power MOSFET
- Step Resolution:
- -
- Applications:
- Fan Motor Driver
- Current - Output:
- 500mA
- Voltage - Supply:
- 1.8V ~ 6V
- Voltage - Load:
- 1.8V ~ 6V
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-6
AH5795-WU-7 FAQ
1.How can I place an order for AH5795-WU-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AH5795-WU-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 AH5795-WU-7 reliable?
The price and inventory of AH5795-WU-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AH5795-WU-7 is usually 5 days.
3.What payment methods are accepted for AH5795-WU-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH5795-WU-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH5795-WU-7?
AH5795-WU-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH5795-WU-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 AH5795-WU-7?
For technical support, including AH5795-WU-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH5795-WU-7 requirements.
6.How does Aetrix verify that AH5795-WU-7 is sourced from the original manufacturer or authorized distributors?
All AH5795-WU-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 AH5795-WU-7 meets industry standards.
7.What is the process for return or replacement of AH5795-WU-7?
All AH5795-WU-7 units undergo pre-shipment inspection (PSI). If there is an issue with AH5795-WU-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 AH5795-WU-7 part is unused and in its original packaging.
Return procedure for AH5795-WU-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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