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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Motor Drivers, Controllers

Diodes Incorporated AH284-PG-B

Name: AH284-PG-B
Brand: Diodes Incorporated
SKU: AH284-PG-B
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AH284-PG-B

Manufacturer:: Diodes Incorporated

Category:: Motor Drivers, Controllers

Package:: 4-SSIP

Datasheet:: AH284-PG-B.pdf

Description:: IC MOTOR DRIVER 3.8V-20V 4SIP

Quantity:: RFQ Add To RFQ list

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Inventory:1,515

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Product details

Overview

AH284-PG-B from Diodes Incorporated is an obsolete Hall-effect smart fan motor controller IC designed for two-coil brushless DC (BLDC) cooling fans. It integrates a Hall sensor, dynamic offset correction, dual complementary open-drain drivers with internal Zener protection, and rotor lock detection with automatic restart. Operates from 3.8V to 20V, delivers up to 500mA average output current, and is packaged in SIP-4.

For engineers reviewing the AH284-PG-B datasheet, AH284-PG-B pinout, AH284-PG-B application, or AH284-PG-B equivalent, key selection considerations include its integrated Hall sensing, rotor lock protection timing (0.4–0.6s on, 2.4–3.6s off), output saturation voltage (375–900mV at 300–500mA), magnetic operating point (10–60 Gauss), and SIP-4 package thermal resistance (227°C/W).

Technical Context

The AH284-PG-B implements a closed-loop commutation control architecture using an on-chip Hall plate and amplifier to sense rotor position, feeding logic that drives complementary DO/DOB outputs with built-in Zener clamping. Its lock detection circuit monitors back-EMF absence and initiates shutdown after 0.5s typical, then attempts auto-restart after 3s typical.

It operates across –40°C to +100°C ambient, supports 12V nominal fan systems, and uses internal regulation to maintain stable bias under supply variation. The device's magnetic hysteresis (60 Gauss) ensures robust switching against noise, while its R_DS(ON) (1.25–1.67Ω at 300mA) defines conduction loss in external coil paths.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage Range	3.8V to 20V - Supports 5V, 12V, and 19V fan rails without external regulators.
Average Output Current	500mA per channel - Sufficient to drive small-to-medium BLDC fans up to ~6W at 12V.
Rotor Lock On Time	0.4–0.6s - Determines minimum stall duration before protective shutdown activates.
Output Saturation Voltage	375–900mV at 300–500mA - Directly impacts power dissipation and coil voltage headroom.
Magnetic B_OP	10–60 Gauss - Sets minimum field strength required to trigger Hall switch activation.
Thermal Resistance θ_JA	227°C/W (SIP-4) - Defines junction-to-ambient rise per watt; limits continuous power to ~220mW at 100°C ambient.
Operating Temperature	–40°C to +100°C - Validated for industrial-grade fan environments including server chassis and power supplies.

Pinout & Package

Package: SIP-4 (Single In-line Package, 4-pin, through-hole). Compact 14.3mm × 3.65mm footprint with 2.54mm pin pitch and 1.55mm height; optimized for PCB space-constrained fan modules.

Pin	Circuit Role	Design Meaning
1	Vdd	Positive supply input - Must be decoupled with ≥2.2μF capacitor; max 24V absolute rating.
2	DO	Open-drain output A - Drives one motor coil; requires external pull-up to Vdd or higher rail.
3	DOB	Complementary open-drain output B - Phase-inverted relative to DO for 2-phase commutation.
4	GND	Power and signal reference ground - Shared return path for Hall sensor, logic, and outputs.

Key Features

Feature	Design Value
Integrated Hall sensor + amplifier	Eliminates need for external magnetic sensing components and signal conditioning circuitry.
Rotor lock protection with auto-restart	Prevents thermal damage during stall; enables recovery without system-level intervention.
Internal Zener diode protection on outputs	Clamps inductive kickback from motor coils, removing requirement for external flyback diodes.
Green, lead-free, halogen-free construction	Meets RoHS 2 (2011/65/EU) and Diodes Inc.'s "Green" standard (<900ppm Br/Cl, <1000ppm Sb).

Applications

Server Chassis Cooling Fan

Industrial Power Supply Fan

Use Scenario: Forced-air cooling of high-density server boards where fan reliability directly impacts uptime.

IC Role / Device Role / Timing Role: Commutates two-coil BLDC fan via Hall feedback; provides lock detection to prevent burnout during dust-clogged operation.

Use Value: Auto-restart after obstruction removal avoids manual fan replacement or system reboot, reducing maintenance overhead.

Use Scenario: Thermal management in enclosed AC/DC power supplies operating continuously at elevated ambient temperatures.

IC Role / Device Role / Timing Role: Drives fan with integrated Hall sensing and Zener-protected outputs, eliminating external protection components.

Use Value: Reduces BOM count by 3–4 discrete parts (Hall IC, dual MOSFET drivers, clamp diodes), improving board-level reliability.

Network Switch Heat Sink Fan

Medical Diagnostic Equipment Ventilation

Use Scenario: Low-noise airflow control in Layer 3 network switches with variable thermal load profiles.

IC Role / Device Role / Timing Role: Provides precise two-phase commutation synchronized to rotor position; maintains consistent RPM across 3.8–20V input range.

Use Value: Wide supply range accommodates aging PSU rails and brown-out conditions without speed droop or stall.

Use Scenario: Air circulation in non-life-support medical imaging enclosures requiring low EMI and long-term stability.

IC Role / Device Role / Timing Role: Controls fan as part of thermally managed subsystem; leverages internal offset correction for drift-free Hall operation over 10+ year service life.

Use Value: Dynamic offset correction maintains magnetic sensitivity accuracy despite solder-induced stress and temperature cycling.

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	Successor device with improved thermal performance (θ_JA = 156°C/W in SOT89-5), extended B_OP range (5–70 Gauss), and tighter t_RLP-ON tolerance (±10%).	Designed for surface-mount fan modules; not pin-compatible with SIP-4 AH284-PG-B due to 5-pin SOT89-5 layout.	Select when upgrading legacy designs to SMT assembly and requiring higher ambient temperature margin.
ZXBM5212	Three-phase driver with integrated Hall latching, higher output current (1A), but no rotor lock auto-restart; requires external Zener clamping.	Targets higher-power fans (>10W); lacks integrated lock-detection logic and automatic recovery behavior.	Choose only if three-phase commutation and >500mA drive are required, and system firmware can manage stall recovery.

Compared with AH284-PG-B, AH2985 offers superior thermal capability and magnetic flexibility in a different package, while ZXBM5212 trades integration for higher power and phase count-neither is drop-in compatible, and both require PCB and firmware rework.

Availability

AH284-PG-B is available at Aetrix Electronics and suitable for server chassis cooling, industrial power supply fans, and network switch thermal management requiring stable component supply despite its NRND status.

Supply support for AH284-PG-B 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 precision sensing solutions.

The AH284 belongs to Diodes' Hall-effect motor controller product line, engineered specifically for cost-sensitive, space-constrained BLDC fan applications in computing and industrial equipment where integration and protection features reduce system-level complexity.

FAQ

Is AH284-PG-B still in production?

No. AH284-PG-B is officially marked "NRND" (Not Recommended for New Design) and "OBSOLETE" in Diodes Incorporated's documentation. It remains available through authorized distributors for legacy system repair and continuity, but no new manufacturing lots are planned. Customers designing new products should evaluate AH2985 or other active alternatives.

What is the function of the NC pin in the SOT89-5 variant?

The NC (No Connect) pin in the SOT89-5 package (Pin 4) is internally unconnected and must remain floating or grounded per layout guidelines-it serves no electrical function and is included for mechanical symmetry and thermal pad alignment. It is absent in the SIP-4 variant, which has only four functional pins.

Can AH284-PG-B drive a three-phase BLDC motor?

No. AH284-PG-B is strictly a two-phase (two-coil) commutator. Its functional block diagram, truth table, and pinout confirm only DO and DOB outputs with complementary timing. Driving a three-phase motor would require at minimum six output drivers and a different Hall decoding scheme, which this device does not implement.

Why does the datasheet specify both SIP-4 and SOT89-5 packages but the part number ends in '-PG-B'?

The suffix '-PG-B' explicitly denotes the SIP-4 package ('P') and Green material ('G') in bulk packaging ('B'). The SOT89-5 variant is designated separately as AH284-YG-13. Though both share the same die, they differ in pin count, thermal performance, and mounting method-so package identity is encoded in the full orderable part number, not inferred from base prefix.

AH284-PG-B Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: 4-SSIP

Packaging:: Bulk

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:: Through Hole

Supplier Device Package:: 4-SIP

AH284-PG-B FAQ

1.How can I place an order for AH284-PG-B through Aetrix?

Please submit a Request for Quotation (RFQ) for AH284-PG-B 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 AH284-PG-B reliable?

The price and inventory of AH284-PG-B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AH284-PG-B is usually 5 days.

3.What payment methods are accepted for AH284-PG-B?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH284-PG-B transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AH284-PG-B?

AH284-PG-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AH284-PG-B 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 AH284-PG-B?

For technical support, including AH284-PG-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH284-PG-B requirements.

6.How does Aetrix verify that AH284-PG-B is sourced from the original manufacturer or authorized distributors?

All AH284-PG-B 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 AH284-PG-B meets industry standards.

7.What is the process for return or replacement of AH284-PG-B?

All AH284-PG-B units undergo pre-shipment inspection (PSI). If there is an issue with AH284-PG-B, 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 AH284-PG-B part is unused and in its original packaging.

Return procedure for AH284-PG-B:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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