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Diodes Incorporated AH5798-WTG-7
- Part No.:
- AH5798-WTG-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Motor Drivers, Controllers
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
AH5798-WTG-7.pdf
- Description:
- IC MOTOR DRIVER 1.8V-5V TSOT25
- Quantity:
- Payment:
- Shipping:
Inventory:2,526
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Product details
Overview
AH5798-WTG-7 from Diodes Incorporated is a single-phase Hall-effect latch smart fan motor controller IC designed for driving single-coil brushless DC (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 5.5V and supports 3.3V/5V BLDC fans in netbooks and low-power embedded cooling systems.
For engineers reviewing the AH5798-WTG-7 datasheet, AH5798-WTG-7 pinout, AH5798-WTG-7 application, or AH5798-WTG-7 equivalent, key selection criteria include integrated Hall sensing, soft-switching EMI reduction, rotor lock auto-restart behavior, FG output timing alignment with magnetic transitions, and TSOT25 package thermal performance at 105°C ambient.
Technical Context
The AH5798 implements a closed-loop commutation control architecture using an on-chip Hall latch to detect rotor position and drive complementary O1/O2 outputs via a soft-switching full-bridge. Magnetic hysteresis (50 G typ.) ensures robust operation across temperature and supply voltage variations (1.8–5.5 V).
Functional block integration includes lock-detection logic that forces output shutdown upon stalled-rotor detection and initiates automatic restart once mechanical obstruction clears. The FG output directly reflects magnetic polarity transitions-not motor RPM-enabling precise commutation monitoring without external timing components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.8 V to 5.5 V - Enables direct interface with 3.3 V and 5 V system rails without level-shifting. |
| Peak Output Current | 800 mA - Sufficient to drive typical 30 mm–60 mm single-coil BLDC fans at rated speed and load. |
| FG Output Type | Open-drain frequency generator - Requires external 10 kΩ pull-up; output toggles per magnetic pole transition, not per revolution. |
| Operating Ambient Temp | −40 °C to +105 °C - Validated for industrial-grade fan control in enclosed thermal environments. |
| Magnetic Sensitivity | BOP: 10–50 G, BRP: −50 to −10 G - Ensures reliable latching across air-gap variations and magnet aging. |
| Soft-Switching Duration | 100 μs typ. - Reduces audible noise and conducted EMI during commutation edges in fan applications. |
| Thermal Shutdown Threshold | Internally set - Activates before junction temperature exceeds safe operating limit; hysteresis enables automatic recovery. |
Pinout & Package
Package: TSOT25 - 5-pin, low-profile (0.6 mm max height), RoHS-compliant green molding compound; optimized for space-constrained fan modules and notebook thermal subsystems.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Vdd | Positive power supply input | Accepts 1.8–5.5 V; requires local 0.1 µF bypass capacitor to Vss for stable operation. |
| Vss | Ground reference | Return path for all internal circuits and output stage; must be low-impedance connection to system ground plane. |
| O1 | Full-bridge output 1 | Drives one side of motor coil; switches between high-Z and sink states under Hall-latched control logic. |
| O2 | Full-bridge output 2 | Complementary to O1; provides push-pull-like drive without external H-bridge transistors. |
| FG | Frequency generator output | Open-drain output synchronized to magnetic field transitions; used for speed verification and stall detection. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Hall-effect latch | Eliminates need for external sensor and signal conditioning; operates down to 1.8 V supply with 50 G hysteresis. |
| Soft-switching commutation | Reduces dv/dt-induced EMI and acoustic noise by limiting edge slew rate to 100 μs, critical for quiet fan designs. |
| Rotor lock protection | Detects stalled condition within milliseconds, shuts off O1/O2, and automatically re-engages drive after mechanical clearance. |
| No external timing capacitor | Enables fully self-contained operation-no RC network required for startup or speed regulation-reducing BOM count by one component. |
| Tachometer (FG) output | Provides real-time feedback aligned to magnetic transitions, enabling firmware-based stall diagnostics without additional sensors. |
Applications
| Netbook Cooling Fan Control | Notebook Thermal Management |
|---|---|
Use Scenario: Regulating airflow in ultra-thin portable computing devices where acoustic noise and PCB area are constrained. IC Role / Device Role / Timing Role: Single-chip BLDC commutator with integrated Hall sensing and FG feedback for closed-loop speed monitoring. Use Value: Soft switching reduces audible whine below 25 dB(A); TSOT25 footprint saves >30% board area versus SOT89-5L alternatives. |
Use Scenario: Maintaining CPU/GPU junction temperatures within spec during burst workloads in compact chassis with limited heatsink mass. IC Role / Device Role / Timing Role: Smart fan driver executing rotor-position-synchronized commutation and automatic lock recovery without host intervention. Use Value: Rotor lock protection prevents coil overheating during thermal throttling events; FG output enables OS-level fan health reporting. |
| Low-Voltage Industrial Blower | Embedded Edge Device Cooling |
Use Scenario: Driving 24 V or lower DC blowers in programmable logic controllers (PLCs) and DIN-rail mounted I/O modules. IC Role / Device Role / Timing Role: Hall-latched motor controller delivering regulated torque and stall resilience in unattended 24/7 operation. Use Value: −40 °C to +105 °C operating range ensures reliability in industrial enclosures; thermal shutdown prevents catastrophic failure during dust-clogged operation. |
Use Scenario: Active cooling of AI inference accelerators, wireless gateways, and fanless-designed edge servers requiring silent thermal management. IC Role / Device Role / Timing Role: Compact BLDC driver with FG output tied to microcontroller GPIO for real-time speed validation and predictive maintenance logging. Use Value: No external timing components simplify layout and reduce qualification effort; green molding compound meets RoHS and REACH compliance requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar single-phase BLDC fan controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AH9485 | Higher Vdd max (20 V), no integrated Hall sensor - requires external latching Hall IC and biasing network. | Targeted at higher-voltage industrial fans (12–24 V); lacks rotor lock auto-restart and soft switching. | Select when operating above 5.5 V or needing field-replaceable sensor architecture. |
| AH9486 | Same package and pinout as AH5798 but adds PWM speed control input; no FG output. | Used where variable-speed command is delivered externally via PWM rather than inferred from FG feedback. | Choose when host MCU provides dynamic speed profiles and FG telemetry is unnecessary. |
Compared with AH9485 and AH9486, the AH5798-WTG-7 delivers a complete, self-timed solution for low-noise 3.3/5 V fans - integrating sensing, drive, protection, and telemetry in one TSOT25 package - whereas alternatives trade integration for voltage range or control flexibility.
Availability
AH5798-WTG-7 is available at Aetrix Electronics and suitable for netbook cooling fans, notebook thermal management subsystems, and low-voltage industrial blowers requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for AH5798-WTG-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 AH5798 belongs to Diodes' Smart Motor Control product line, engineered specifically for cost-sensitive, space-constrained BLDC fan applications demanding integrated Hall sensing, low EMI, and autonomous fault recovery.
FAQ
What is the function of the FG pin on the AH5798-WTG-7?
The FG (Frequency Generator) pin is an open-drain output that toggles with each magnetic polarity transition detected by the internal Hall latch-not per motor revolution. Its frequency matches the magnetic change rate, enabling stall detection and commutation timing verification. A 10 kΩ pull-up resistor to Vdd is required for proper logic-level output.
Does the AH5798-WTG-7 require external components for basic operation?
Yes, but minimally: a 0.1 µF ceramic bypass capacitor between Vdd and Vss is mandatory, and a 10 kΩ pull-up resistor on the FG pin is recommended. Unlike many fan drivers, it needs no external timing capacitor, Hall bias resistors, or current-sense networks due to full integration of sensing and control logic.
How does rotor lock protection work on the AH5798-WTG-7?
Rotor lock detection monitors O1/O2 switching activity and magnetic transition timing. If no Hall transitions occur for a defined interval while power is applied, the device disables both outputs and enters a low-power hold state. Upon detection of magnetic movement, it automatically initiates controlled ramp-up to nominal speed without host MCU involvement.
Can the AH5798-WTG-7 drive a 12 V fan?
No. The AH5798-WTG-7 has an absolute maximum Vdd rating of 6 V and a recommended operating range of 1.8 V to 5.5 V. Attempting to operate it at 12 V will cause permanent damage. For 12 V fans, Diodes recommends the AH9485, which supports up to 20 V supply and uses an external Hall sensor.
AH5798-WTG-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- 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:
- -
- Voltage - Supply:
- 1.8V ~ 5V
- Voltage - Load:
- 1.8V ~ 5V
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-25
AH5798-WTG-7 FAQ
1.How can I place an order for AH5798-WTG-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AH5798-WTG-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 AH5798-WTG-7 reliable?
The price and inventory of AH5798-WTG-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AH5798-WTG-7 is usually 5 days.
3.What payment methods are accepted for AH5798-WTG-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH5798-WTG-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH5798-WTG-7?
AH5798-WTG-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH5798-WTG-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 AH5798-WTG-7?
For technical support, including AH5798-WTG-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH5798-WTG-7 requirements.
6.How does Aetrix verify that AH5798-WTG-7 is sourced from the original manufacturer or authorized distributors?
All AH5798-WTG-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 AH5798-WTG-7 meets industry standards.
7.What is the process for return or replacement of AH5798-WTG-7?
All AH5798-WTG-7 units undergo pre-shipment inspection (PSI). If there is an issue with AH5798-WTG-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 AH5798-WTG-7 part is unused and in its original packaging.
Return procedure for AH5798-WTG-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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