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Diodes Incorporated AH285-YG-13
- Part No.:
- AH285-YG-13
- Manufacturer:
- Diodes Incorporated
- Category:
- Motor Drivers, Controllers
- Package:
- SOT-89-5/6
- Datasheet:
-
AH285-YG-13.pdf
- Description:
- IC MOTOR DRIVER 3.8V-20V SOT89-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,275
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Product details
Overview
AH285-YG-13 from Diodes Incorporated is a Hall-effect smart fan motor controller IC for two-coil brushless DC (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 compact thermal management in low-power fan control.
For engineers reviewing the AH285-YG-13 datasheet, AH285-YG-13 pinout, AH285-YG-13 application, or AH285-YG-13 equivalent, key selection considerations include its integrated Hall sensing, FG frequency generation tied to magnetic change rate, Rotor Lock Protection 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-YG-13 implements a closed-loop commutation controller 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 (35–60V breakdown). Its lock detection circuit monitors stalled rotation via magnetic signal absence and initiates shutdown within 0.5s typical.
FG output delivers open-drain pulses synchronized to magnetic polarity transitions-frequency directly proportional to motor RPM-not derived from internal clock or counter. The regulator supplies bias to internal blocks from VDD (3.8–20V), while thermal derating begins above 25°C, limiting power dissipation to 320mW at +100°C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.8V to 20V operating range-supports 12V BLDC fans without external LDO; max 24V absolute rating prevents damage during load dump. |
| Avg Output Current | 500mA per channel-sufficient to drive typical two-coil 40–60mm cooling fans with 1.25Ω RDS(ON) at 300mA. |
| Rotor Lock On Time | 0.4–0.6s-configures fast response to stall before coil overheating; fixed internal timer, no external component tuning. |
| FG Output Type | Open-drain frequency generator-outputs pulse train at magnetic transition rate; requires external pull-up for logic-level interface to MCU or monitoring circuit. |
| Hall Bop / Brp | 10–60G / –60 to –10G-wide hysteresis (≥60G) ensures robust commutation in noisy EMI environments near motors. |
| Thermal Resistance | θJA = 156°C/W-dictates heatsink requirement; 800mW max PD at 25°C drops to 320mW at +100°C ambient, limiting continuous duty in sealed enclosures. |
Pinout & Package
SOT89-5 package: 5-pin thermally enhanced surface-mount outline with exposed pad (not electrically connected), 1.5mm pitch, 4.5mm × 2.5mm footprint, and 1.5mm height. Pin 1 (DOB) and Pin 2 (DO) are complementary open-drain outputs; Pin 3 (GND) is power ground; Pin 4 (FG) is open-drain tachometer; Pin 5 (Vdd) is supply input.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (DOB) | Complementary Output Driver | Active-low open-drain output paired with DO; sinks current to drive one BLDC coil leg; Zener-clamped to 35–60V. |
| Pin 2 (DO) | Primary Output Driver | Active-low open-drain output; drives second BLDC coil leg; complements DOB for 180° phase-shifted commutation. |
| Pin 3 (GND) | Power Ground Reference | Common return path for Vdd, Hall sensor, logic, and output drivers; must be low-impedance to minimize noise coupling into Hall plate. |
| Pin 4 (FG) | Tachometer Frequency Generator | Open-drain output pulsing at magnetic pole transition rate-2 pulses per full rotor revolution for standard 2-pole magnet. |
| Pin 5 (Vdd) | Supply Input | 3.8–20V DC input powering internal regulator, Hall sensor, amplifier, logic, and drivers; bypass capacitor required per datasheet layout. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Hall Sensor + Amplifier | Eliminates external sensor and signal conditioning; Bop/Brp spread ≥60G enables reliable operation despite solder-induced stress or temperature drift. |
| Rotor Lock Protection | Detects stalled rotor within 0.5s, disables DO/DOB, and auto-restarts after 3s-prevents coil burnout without MCU intervention. |
| Zener-Protected Outputs | Internal 35–60V Zener clamps on DO/DOB suppress inductive kickback from BLDC coils, removing need for external TVS diodes. |
| FG Output Synchronization | FG pulses align precisely with magnetic transitions-not averaged or filtered-enabling accurate real-time RPM measurement in closed-loop speed control. |
Applications
| CPU Cooling Fan Control | Server Chassis Airflow Management |
|---|---|
Use Scenario: Regulating 12V, 40mm–60mm two-coil BLDC fans in x86 server CPUs where thermal throttling triggers dynamic speed adjustment. IC Role / Device Role / Timing Role: Hall-based commutation controller providing real-time rotor position feedback and FG-synchronized speed reporting to BMC or host CPU. Use Value: Enables precise closed-loop fan speed control using FG pulses (2 per revolution), reducing acoustic noise by 3–5dB(A) versus voltage-controlled alternatives. |
Use Scenario: Managing redundant 48V-input, 12V-output BLDC fans across multi-slot server chassis with distributed thermal sensors. IC Role / Device Role / Timing Role: Standalone motor driver with autonomous Rotor Lock Protection-shuts down failed fan without system-level fault propagation. Use Value: Prevents thermal runaway in adjacent slots by isolating stalled fan within 0.5s, maintaining airflow continuity for remaining modules. |
| Industrial PLC Cabinet Ventilation | Network Switch Power Supply Cooling |
Use Scenario: Driving ruggedized 24V BLDC fans in IP54-rated PLC cabinets exposed to dust, vibration, and -40°C to +70°C ambient. IC Role / Device Role / Timing Role: Integrated Hall controller eliminating external sensor alignment; FG output feeds PLC analog input module for predictive maintenance logging. Use Value: Reduces BOM count by 3 components (Hall sensor, comparator, driver FETs) while maintaining operation at -40°C with <10μA IOFF leakage. |
Use Scenario: Cooling 1U network switch power supplies with space-constrained 30mm BLDC fans requiring silent operation below 25dB(A). IC Role / Device Role / Timing Role: Low-noise commutation driver with Zener-clamped outputs suppressing EMI from coil switching-meets CISPR 22 Class B limits. Use Value: Achieves <25dB(A) acoustic noise at 1m by eliminating external snubbers and enabling smooth trapezoidal back-EMF commutation. |
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 |
|---|---|---|---|
| AH2985 | Same pinout and functional block diagram but updated Rotor Lock timing (tRLP-ON = 0.25s, tRLP-OFF = 1.5s); tighter Bop/Brp tolerance (±15G vs ±30G). | Preferred for high-reliability fan systems requiring faster lock detection and reduced magnetic sensitivity drift over temperature. | Select AH2985 when redesigning for improved stall response and lower field calibration variance; not drop-in due to timing differences affecting startup behavior. |
| ALLEGRO A3977SLDTR-T | Microstepping stepper driver with Hall inputs; requires external Hall sensors and separate FG generation logic; higher Vdd (4.5–36V) and IOUT (1.5A). | Used in precision positioning fans or hybrid BLDC/stepper systems-not optimized for cost-sensitive, single-board fan control. | Choose only if needing microstepping capability or >500mA coil current; adds 4 external components and increases PCB area by 3×. |
Compared with AH2985, AH285-YG-13 offers slower but more stable lock detection timing and wider magnetic hysteresis, making it suitable for legacy fan designs with looser magnet tolerances; versus A3977, it reduces system complexity and cost by integrating Hall sensing and FG generation in one SOT89-5 package.
Availability
AH285-YG-13 is available at Aetrix Electronics and suitable for CPU cooling fan control, server chassis airflow management, industrial PLC cabinet ventilation, and network switch power supply cooling requiring stable component supply despite NRND status.
Supply support for AH285-YG-13 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 timing solutions for industrial, computing, and consumer markets.
The AH285 belongs to Diodes' Hall-effect motor controller product line, designed specifically for cost-optimized, self-contained BLDC fan control in space-constrained thermal management systems without MCU supervision.
FAQ
What is the function of the FG pin on AH285-YG-13?
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-typically two pulses per full rotor revolution. It requires an external pull-up resistor to interface with MCU GPIO or monitoring circuits, delivering real-time RPM data without internal division or filtering.
Does AH285-YG-13 require external components for basic operation?
Yes: a minimum 10μF Vdd bypass capacitor is mandatory per datasheet layout; external pull-up on FG (e.g., 10kΩ to Vdd); and recommended Zener diode (≤24V) between Vdd and GND for transient protection. No external Hall sensor, gate drivers, or current-sense resistors are needed-the IC integrates all core functions.
Can AH285-YG-13 drive three-phase BLDC fans?
No-it is designed exclusively for two-coil (single-phase) BLDC fans with complementary DO/DOB outputs. Three-phase operation requires six-step commutation and three half-bridge drivers, which AH285 does not support. Attempting to use it with three-phase motors results in incomplete rotation or lockup.
What does "NRND" mean for AH285-YG-13, and is it still manufacturable?
"NRND" (Not Recommended for New Design) indicates Diodes Incorporated no longer promotes AH285-YG-13 for new projects due to newer alternatives like AH2985. However, it remains in active production with confirmed tape-and-reel availability (2500 units per reel) and full datasheet support through Diodes' website and authorized distributors.
AH285-YG-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-YG-13 FAQ
1.How can I place an order for AH285-YG-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for AH285-YG-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-YG-13 reliable?
The price and inventory of AH285-YG-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-YG-13 is usually 5 days.
3.What payment methods are accepted for AH285-YG-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH285-YG-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AH285-YG-13?
AH285-YG-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AH285-YG-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-YG-13?
For technical support, including AH285-YG-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH285-YG-13 requirements.
6.How does Aetrix verify that AH285-YG-13 is sourced from the original manufacturer or authorized distributors?
All AH285-YG-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-YG-13 meets industry standards.
7.What is the process for return or replacement of AH285-YG-13?
All AH285-YG-13 units undergo pre-shipment inspection (PSI). If there is an issue with AH285-YG-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-YG-13 part is unused and in its original packaging.
Return procedure for AH285-YG-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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