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Diodes Incorporated AH285-YL-13
- Part No.:
- AH285-YL-13
- Manufacturer:
- Diodes Incorporated
- Category:
- Motor Drivers, Controllers
- Package:
- SOT-89-5/6
- Datasheet:
-
AH285-YL-13.pdf
- Description:
- IC MOTOR DRIVER 3.8V-20V SOT89-5
- Quantity:
- Payment:
- Shipping:
Inventory:5,000
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Product details
Overview
AH285 from Diodes Incorporated is a Hall-effect smart fan motor controller IC for two-coil BLDC cooling fans, integrating a Hall sensor, dynamic offset correction, dual complementary open-drain drivers (500mA avg), Rotor Lock Protection with auto-restart, and tachometer (FG) output. It operates from 3.8V to 20V and is packaged in SOT89-5.
For engineers reviewing the AH285 datasheet, AH285 pinout, AH285 application, or AH285 equivalent, key selection considerations include its integrated Hall sensing, FG frequency generation tied to magnetic change rate, rotor lock detection timing (0.4–0.6s on, 2.4–3.6s off), Zener-protected outputs, and SOT89-5 thermal performance (θJA = 156°C/W).
Technical Context
The AH285 implements a closed-loop commutation control architecture using an on-chip Hall plate and amplifier to detect rotor position, feeding logic that drives complementary DO/DOB outputs with built-in Zener clamping. Its Rotor Lock Protection circuit monitors stalled conditions via absence of FG pulses and initiates shutdown after 0.4–0.6 seconds.
Functional block integration includes internal voltage regulation, magnetic hysteresis (60 Gauss), and FG output synchronized to magnetic polarity transitions-not motor electrical cycle-enabling direct speed monitoring without external decoding. Output saturation voltage is specified at 375–900 mV across 300–500 mA load range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.8V to 20V operating range; supports 12V DC fan systems with margin for transient spikes up to 24V absolute max. |
| Avg Output Current | 500mA per channel; sufficient to drive typical low-power two-coil BLDC fans without external boost stages. |
| Rotor Lock On Time | 0.4–0.6s detection window; ensures reliable stall identification before initiating protective shutdown. |
| FG Output Type | Open-drain frequency generator; output frequency equals magnetic pole transition rate, not motor RPM directly. |
| Output Saturation V | 375–900mV at 300–500mA; defines minimum voltage drop across driver during conduction, impacting coil voltage headroom. |
| Thermal Resistance | θJA = 156°C/W; requires PCB copper area or heatsinking for >320mW dissipation above 100°C ambient. |
| Magnetic Hysteresis | 60 Gauss; prevents oscillation near Bop/Brp thresholds under noisy or drifting field conditions. |
Pinout & Package
The AH285 is housed in a thermally enhanced SOT89-5 package with exposed thermal pad (pin 4), optimized for power dissipation in compact fan modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DOB) | Complementary Output Driver | Drives one BLDC coil leg; open-drain with internal Zener clamp to 35–60V for flyback protection. |
| 2 (DO) | Main Output Driver | Drives second BLDC coil leg; complements DOB for 180° phase-shifted commutation. |
| 3 (GND) | Power & Signal Reference | Common return for supply, Hall sensor, logic, and output drivers; must be low-impedance for stable operation. |
| 4 (FG) | Frequency Generator Output | Open-drain tach signal pulsed at magnetic pole transition rate; requires external pull-up for logic-level interface. |
| 5 (Vdd) | Positive Supply Input | 3.8–20V input with internal regulator; powers Hall sensor, logic, and drivers; bypass capacitor required. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Hall Sensor + Amplifier | Eliminates external sensing components; Bop = 10–60 Gauss, Brp = –60 to –10 Gauss enables robust rotor position detection in varying air gaps. |
| Rotor Lock Protection | Detects zero FG activity for ≥0.4s, shuts down DO/DOB, then auto-restarts after ≥2.4s-prevents coil burnout during mechanical stall. |
| Zener-Protected Outputs | Internal 35–60V Zener clamps suppress inductive kickback from BLDC coils, removing need for external TVS diodes. |
| Tachometer (FG) Output | Provides pulse train synchronized to magnetic transitions-enables speed feedback without Hall decoder IC or microcontroller firmware overhead. |
| SOT89-5 Thermal Design | Exposed thermal pad and θJA = 156°C/W allow 320mW continuous dissipation at 100°C ambient-suitable for sealed fan housings. |
Applications
| CPU Cooling Fan Control | Server Chassis Fan Module |
|---|---|
Use Scenario: Regulating airflow in high-density server racks where thermal throttling triggers variable-speed fan response. IC Role / Device Role / Timing Role: Hall-based commutation controller generating phase-switching signals and FG feedback for closed-loop speed control. Use Value: Integrated Rotor Lock Protection prevents coil overheating during dust-clogged or bearing-failed fan stalls-reducing field failure rates. | Use Scenario: Driving redundant 12V BLDC fans in telecom chassis with remote speed monitoring via FG signal. IC Role / Device Role / Timing Role: Single-chip motor driver providing FG pulses proportional to magnetic transitions for host BMC speed verification. Use Value: Eliminates need for separate Hall sensor, gate drivers, and protection diodes-reducing BOM count by ≥4 components per fan channel. |
| Industrial PLC Cabinet Fan | Network Switch Heat Management |
Use Scenario: Maintaining safe enclosure temperature in factory-floor PLC cabinets exposed to wide ambient swings (–40°C to +70°C). IC Role / Device Role / Timing Role: Motor controller with –40°C to +100°C operating range and magnetic hysteresis tolerance for stable commutation under vibration. Use Value: Built-in dynamic offset correction maintains Hall accuracy across temperature, avoiding speed drift or commutation errors. | Use Scenario: Controlling dual-fan cooling in layer-3 switches with real-time speed telemetry for thermal event logging. IC Role / Device Role / Timing Role: FG output feeds into switch ASIC's PWM monitor input, enabling firmware-based fan health diagnostics. Use Value: Open-drain FG allows direct interfacing with 3.3V or 5V logic without level-shifting-reducing layout complexity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Hall-effect BLDC fan controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ALLEGRO A3977SLDTR-T | Microstepping stepper driver with current regulation; no integrated Hall sensor or FG output. | Designed for precision positioning, not fan speed control; lacks rotor lock auto-restart and tach feedback. | Not suitable for drop-in replacement; requires redesign for current-mode control and external sensing. |
| ON Semiconductor NCP5425DR2G | Two-channel MOSFET gate driver only; no Hall sensor, logic, or protection features. | Requires external Hall latches, comparators, and Zener protection-increasing component count and board space. | Only viable if full system-level design control is available and cost-per-function optimization is prioritized over integration. |
Compared with A3977SLDTR-T and NCP5425DR2G, the AH285 delivers higher functional integration-combining sensing, logic, drive, protection, and telemetry in one SOT89-5 package-making it optimal for cost-sensitive, space-constrained BLDC fan designs despite NRND status.
Availability
AH285 is available at Aetrix Electronics and suitable for CPU cooling fan control, server chassis fan modules, industrial PLC cabinet fans, and network switch heat management requiring stable component supply despite its Not Recommended for New Design status.
Supply support for AH285 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 protection solutions for industrial, computing, and consumer markets.
The AH285 belongs to Diodes' Hall-effect motor controller product line, designed specifically for integrated, low-component-count BLDC fan drive in thermally constrained environments-emphasizing reliability, stall protection, and tach feedback without microcontroller dependency.
FAQ
What is the function of the FG pin on the AH285?
The FG (Frequency Generator) pin is an open-drain output that pulses at the rate of magnetic pole transitions detected by the internal Hall sensor-not motor RPM. Each pulse corresponds to a magnetic polarity reversal, enabling speed monitoring when paired with an external pull-up resistor and counter circuit. Its frequency scales linearly with fan rotation speed under fixed magnet pole count.
Does the AH285 require external components for basic operation?
Yes: a minimum 2.2μF bulk capacitor on Vdd, external pull-up resistor on FG, and recommended 56Ω gate resistors on DO/DOB are required per the datasheet. A Zener diode between Vdd and GND is advised for overvoltage protection beyond the device's 24V absolute maximum rating.
How does Rotor Lock Protection behave during startup?
Rotor Lock Protection activates only after initial rotation is established and then lost. During cold start, the AH285 attempts normal commutation for up to 0.6 seconds before triggering lock detection. If rotation begins within that window, protection remains inactive; if stalled immediately after power-on, shutdown occurs after the full 0.4–0.6s timeout.
Is the AH285 pin-compatible with any active Diodes BLDC controllers?
No. The AH285 has no direct pin-compatible successor in Diodes' current portfolio. Its SOT89-5 pinout (DOB/DO/GND/FG/Vdd) differs from newer devices like the AH189x series, which use different packages and output configurations. Migration requires PCB redesign and firmware adaptation for FG interpretation.
AH285-YL-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOT-89-5/6
- 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:
- Low Side (2)
- Interface:
- On/Off
- Technology:
- Power MOSFET
- Step Resolution:
- -
- Applications:
- Fan Motor Driver
- Current - Output:
- 500mA
- Voltage - Supply:
- 3.8V ~ 20V
- Voltage - Load:
- 3.8V ~ 20V
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-89-5
AH285-YL-13 FAQ
1.How can I place an order for AH285-YL-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for AH285-YL-13 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 AH285-YL-13 reliable?
The price and inventory of AH285-YL-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AH285-YL-13 is usually 5 days.
3.What payment methods are accepted for AH285-YL-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH285-YL-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH285-YL-13?
AH285-YL-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH285-YL-13 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 AH285-YL-13?
For technical support, including AH285-YL-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH285-YL-13 requirements.
6.How does Aetrix verify that AH285-YL-13 is sourced from the original manufacturer or authorized distributors?
All AH285-YL-13 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 AH285-YL-13 meets industry standards.
7.What is the process for return or replacement of AH285-YL-13?
All AH285-YL-13 units undergo pre-shipment inspection (PSI). If there is an issue with AH285-YL-13, 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 AH285-YL-13 part is unused and in its original packaging.
Return procedure for AH285-YL-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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