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Diodes Incorporated AH5794-WU-7
- Part No.:
- AH5794-WU-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Motor Drivers, Controllers
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
AH5794-WU-7.pdf
- Description:
- IC MOTOR DRIVER ON/OFF TSOT26
- Quantity:
- Payment:
- Shipping:
Inventory:5,964
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Product details
Overview
AH5794-WU-7 from Diodes Incorporated is a single-phase Hall-effect latch fan motor driver IC designed for single-coil BLDC cooling fans. It integrates a Hall sensor, amplifier, full-bridge driver with soft switching, rotor lock protection, thermal shutdown, and open-drain FG tachometer output. Operates from 1.8V to 6V supply, delivers up to 1000mA peak output current, and is packaged in TSOT26.
For engineers reviewing the AH5794-WU-7 datasheet, AH5794-WU-7 pinout, AH5794-WU-7 application, or AH5794-WU-7 equivalent, key selection criteria include VDD-based speed control range (1.8–6V), integrated Hall sensing with ±50G magnetic hysteresis, FG output tied to magnetic change frequency, soft-switching EMI reduction, and dual-package availability (TSOT26/U-DFN2020C-6).
Technical Context
The AH5794 implements a closed-loop commutation system using an on-chip Hall sensor to detect rotor position and drive a full-bridge output stage with soft-switching control logic. Its functional block includes lock-detection circuitry that triggers automatic shutdown and re-start upon rotor stall, independent of external timing components.
Thermal protection activates at 175°C junction temperature with 25°C hysteresis, and the FG output provides a direct open-drain frequency signal proportional to magnetic pole transitions-no external pull-up required beyond the recommended 10kΩ resistor to VDD. The device supports voltage-mode speed control without PWM or external controllers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.8V to 6.0V DC - enables direct speed control via VDD adjustment across low-voltage systems (e.g., 3.3V/5V fans) |
| Peak Output Current | 1000 mA - drives typical single-coil BLDC fans up to ~5W mechanical output at 5V |
| Magnetic Operate Point | 10–50 Gauss - ensures reliable latching with standard ferrite or NdFeB rotor magnets |
| FG Output Type | Open-drain frequency generator - outputs pulse train matching magnetic transition rate; requires external pull-up for logic-level interface |
| Thermal Shutdown Threshold | 175°C with 25°C hysteresis - prevents permanent damage during sustained overload or poor PCB thermal design |
| Soft-Switching Duration | 200 µs typical - reduces audible noise and conducted EMI during coil current reversal |
| Operating Ambient Range | −40°C to +105°C - qualified for industrial and extended-temperature embedded cooling applications |
Pinout & Package
Package: TSOT26 (6-pin, 1.6mm × 2.9mm × 0.9mm, exposed pad optional), RoHS-compliant, halogen-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | Primary DC input (1.8–6V); also serves as analog reference and speed control voltage |
| VSS | Ground reference | System ground return for logic, Hall sensor, and output stage; must be low-impedance |
| O1 / O2 | Full-bridge output terminals | Complementary drive outputs connected directly to motor coil ends; support bidirectional current flow |
| FG | Open-drain tachometer output | Frequency signal synchronized to magnetic pole transitions; requires external 10kΩ pull-up to VDD |
| NC | No connection | Internally unconnected pin; must remain floating-no routing or soldering recommended |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Hall sensor + amplifier | Eliminates need for external magnetic sensing components; operates over full 1.8–6V supply range |
| Rotor lock detection & auto-restart | Detects stalled rotor via current/magnetic signature and initiates safe recovery without host intervention |
| VDD-based speed control | Enables analog fan speed regulation without PWM generation circuitry or microcontroller firmware overhead |
| Soft-switching commutation | Reduces dv/dt and di/dt transients, lowering radiated EMI and audible coil whine in noise-sensitive environments |
| No external timing capacitor | Removes BOM item and layout area typically needed for oscillator-based BLDC drivers, simplifying design |
Applications
| 3V/3.3V Notebook Cooling Fan | Low-Power Instrumentation Fan |
|---|---|
Use Scenario: Active thermal management in space-constrained portable computing devices requiring silent operation and wide-speed-range control. IC Role / Device Role / Timing Role: Single-chip BLDC commutator with integrated Hall sensing, delivering precise rotor-synchronized drive and tach feedback. Use Value: Enables 3.3V-compatible fan speed scaling from 36% to 100% of nominal RPM using only VDD modulation-no external controller needed. | Use Scenario: Forced-air cooling for precision test equipment where EMI must not interfere with analog signal paths or measurement accuracy. IC Role / Device Role / Timing Role: Low-noise motor driver with soft-switching and open-drain FG output for isolated speed monitoring. Use Value: Reduces conducted/radiated emissions by >10dB compared to hard-switched alternatives, preserving signal integrity in sensitive analog front-ends. |
| 5V Netbook Fan Module | Industrial Low-Voltage Motor Control |
Use Scenario: Compact, cost-optimized fan solution for entry-level netbooks operating from 5V rail with thermal throttling requirements. IC Role / Device Role / Timing Role: Full-bridge gate driver with built-in lock protection and thermal shutdown, interfacing directly to brushless motor coil. Use Value: Prevents coil burnout during startup faults or dust-induced stalling-auto-restart resumes operation without system reset. | Use Scenario: Embedded motor control in battery-powered industrial sensors or edge nodes requiring ultra-low standby current and wide input voltage tolerance. IC Role / Device Role / Timing Role: Standalone Hall-latch motor driver supporting 1.8V minimum operation for compatibility with Li-ion or energy-harvested supplies. Use Value: Extends operational life in intermittent-use applications by enabling motor control down to 1.8V while maintaining full FG feedback functionality. |
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 minimum supply voltage (2.7V), no FG output, fixed 5V-only operation | Lacks tachometer feedback and VDD-based speed control flexibility | Select when FG monitoring is unnecessary and system rail is stable at 5V |
| AH9486 | Same package and pinout as AH5794 but lacks rotor lock protection and auto-restart logic | Requires external stall detection or host-level recovery handling | Choose for cost-sensitive designs where lock events are rare or managed externally |
Compared with AH9485 and AH9486, the AH5794-WU-7 uniquely combines VDD-speed control, FG tach output, rotor lock auto-restart, and 1.8V operation-making it the only option among the three suitable for variable-speed, self-protecting, low-voltage fan applications with closed-loop monitoring.
Availability
AH5794-WU-7 is available at Aetrix Electronics and suitable for 3V/3.3V notebook cooling fans, low-power instrumentation fans, and industrial low-voltage motor control applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for AH5794-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 high-reliability power management, signal integrity, and motion control solutions for industrial, computing, and consumer markets.
The AH5794 belongs to Diodes' Hall-effect motor driver product line, engineered specifically for compact, low-noise, self-contained BLDC fan control in thermally constrained environments-emphasizing integration, protection, and ease of use over external component count.
FAQ
What is the function of the NC pin on AH5794-WU-7?
The NC (No Connection) pin on AH5794-WU-7 is internally unconnected and must remain electrically floating. It is not bonded or tied to any internal circuitry. Routing traces to or soldering this pin may cause mechanical stress or unintended coupling; Diodes recommends leaving it unconnected per the datasheet's pin description and package drawings.
Can AH5794-WU-7 drive a 12V fan?
No. AH5794-WU-7 has an absolute maximum VDD rating of 7V and a recommended operating range of 1.8V to 6.0V. Driving a 12V fan would exceed its voltage limits and cause immediate failure. For 12V BLDC fans, Diodes offers higher-voltage alternatives such as the AP22101 or AZ4950 series, which support up to 28V operation.
How does the FG output relate to motor speed?
The FG output frequency equals the magnetic pole transition frequency-i.e., two pulses per electrical cycle. For a 2-pole motor, FG frequency = RPM/60; for a 4-pole motor, FG frequency = (RPM × 2)/60. The output is open-drain, so a 10kΩ pull-up to VDD is required to generate a clean logic-level square wave for MCU capture or monitoring.
Is AH5794-WU-7 qualified for automotive applications?
No. AH5794-WU-7 is not AEC-Q100 qualified and is intended for industrial and commercial applications only. Diodes explicitly states that automotive-grade variants (e.g., AEC-Q100-compliant versions) require separate qualification, PPAP documentation, and IATF 16949 manufacturing-none of which apply to the AH5794-WU-7 part number or its TSOT26 packaging.
AH5794-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:
- On/Off
- 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-26
AH5794-WU-7 FAQ
1.How can I place an order for AH5794-WU-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AH5794-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 AH5794-WU-7 reliable?
The price and inventory of AH5794-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 AH5794-WU-7 is usually 5 days.
3.What payment methods are accepted for AH5794-WU-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH5794-WU-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH5794-WU-7?
AH5794-WU-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH5794-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 AH5794-WU-7?
For technical support, including AH5794-WU-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH5794-WU-7 requirements.
6.How does Aetrix verify that AH5794-WU-7 is sourced from the original manufacturer or authorized distributors?
All AH5794-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 AH5794-WU-7 meets industry standards.
7.What is the process for return or replacement of AH5794-WU-7?
All AH5794-WU-7 units undergo pre-shipment inspection (PSI). If there is an issue with AH5794-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 AH5794-WU-7 part is unused and in its original packaging.
Return procedure for AH5794-WU-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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