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

Diodes Incorporated AH284-PL-B

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

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Part No.:: AH284-PL-B

Manufacturer:: Diodes Incorporated

Category:: Motor Drivers, Controllers

Package:: -

Datasheet:: AH284-PL-B.pdf

Description:: IC HALL FAN CTRLR 500MA 4-SIP

Quantity:: RFQ Add To RFQ list

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Inventory:333

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Product details

Overview

AH284 from Diodes Incorporated is a Hall-effect smart fan motor controller IC for two-coil brushless DC (BLDC) cooling fans and low-power motors, integrating a Hall sensor, dynamic offset correction, dual complementary open-drain drivers with internal Zener protection, and rotor lock detection/shutdown/restart functionality. It operates from 3.8V to 20V, delivers up to 500mA average output current, and supports SIP-4 and SOT89-5 packages.

For engineers reviewing the AH284 datasheet, AH284 pinout, AH284 application, or AH284 equivalent, key selection considerations include its integrated Hall sensing capability, rotor lock protection timing (0.4–0.6s on, 2.4–3.6s off), output saturation voltage (≤900mV at 500mA), magnetic sensitivity (B_OP: 10–60 Gauss), and dual-package availability for thermal and layout flexibility.

Technical Context

The AH284 implements a closed-loop commutation control architecture using an on-chip Hall plate and amplifier to sense rotor position, feeding into logic that drives complementary DO/DOB outputs in sequence to sustain BLDC rotation. Its built-in regulator powers internal circuitry independently of motor coil supply paths.

Rotor lock protection operates autonomously: continuous absence of Hall transitions triggers shutdown within 0.6 seconds, holding outputs off for 3.6 seconds before automatic restart attempt. Output drivers feature internal Zener clamping (35–60V breakdown) and are rated for 700mA peak current with thermal derating curves specified per package.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage Range	3.8V to 20V - Supports 5V, 12V, and 19V fan rails without external regulation
Average Output Current	500mA per channel - Sufficient to drive typical 2-coil BLDC fans up to ~3W mechanical output
Rotor Lock Detection Time	0.4–0.6s - Fast response to stalled rotors prevents coil overheating and driver damage
Output Saturation Voltage	≤900mV at 500mA - Minimizes conduction loss and self-heating during continuous operation
Magnetic Operating Point	10–60 Gauss - Compatible with standard ferrite or NdFeB magnets at air gaps ≤1.1mm
Thermal Resistance θ_JA	SIP-4: 227°C/W; SOT89-5: 156°C/W - Dictates maximum ambient temperature before derating power dissipation
Zener Breakdown Voltage	35–60V - Clamps transients on DO/DOB lines to protect external MOSFET gates or coil flyback energy

Pinout & Package

The AH284 is available in two surface-mount packages: SIP-4 (4-pin single-inline) and SOT89-5 (5-pin small-outline transistor). Both packages integrate the Hall sensor die and driver circuitry in a single monolithic structure with exposed thermal pad on SOT89-5.

Pin/Terminal	Circuit Role	Design Meaning
Vdd	Positive supply input	Bias rail for internal regulator, Hall amplifier, and logic; must be decoupled near pin with ≥2.2μF capacitor
GND	Ground reference	Common return for Hall sensor, logic, and output drivers; requires low-impedance connection to minimize noise coupling
DO	Complementary output A	Open-drain N-channel driver output; sinks current to GND when active; requires external pull-up for BLDC phase A
DOB	Complementary output B	Open-drain N-channel driver output; 180° out-of-phase with DO; drives BLDC phase B
NC (SOT89-5 only)	No-connect terminal	Unused pin; must remain unconnected and unbonded; not internally tied to any node

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 runaway during stall events without requiring MCU intervention or external watchdog
Internal Zener diode protection on outputs	Clamps inductive kickback from motor coils, removing need for discrete TVS or Zener diodes on PCB
Dual-package support (SIP-4 / SOT89-5)	Enables layout optimization: SIP-4 for high-voltage isolation; SOT89-5 for better thermal performance in compact designs
Green, lead-free, halogen-free construction	Meets RoHS 2 and JEDEC J-STD-709C requirements for bromine (<900ppm), chlorine (<900ppm), and antimony (<1000ppm)

Applications

Server Chassis Cooling Fan

Industrial PLC Fan Module

Use Scenario: 12V, 2-wire BLDC cooling fan in 1U server chassis with forced-air flow constraints.

IC Role / Device Role / Timing Role: Hall-based commutation controller providing rotor-position-synchronized drive signals and stall recovery.

Use Value: Eliminates external Hall latches and gate drivers, reducing BOM count by ≥4 components while maintaining reliable startup under dust-loaded conditions.

Use Scenario: Enclosed programmable logic controller with ambient temperature up to +70°C and no active airflow.

IC Role / Device Role / Timing Role: Motor controller with thermal-aware output derating and autonomous lock recovery to maintain cooling integrity.

Use Value: Built-in rotor lock timeout (0.5s) and restart delay (3s) prevent fan seizure-induced CPU throttling without firmware polling overhead.

Medical Diagnostic Equipment Ventilation Fan

Network Switch Heat Sink Fan

Use Scenario: Low-noise, EMI-sensitive ventilation fan in ultrasound imaging system with strict EMC limits.

IC Role / Device Role / Timing Role: Integrated Hall sensor avoids external magnetic coupling paths; open-drain outputs enable controlled slew-rate via pull-up resistors.

Use Value: Single-die integration reduces radiated emissions from sensor-to-driver interconnects, easing Class B FCC compliance.

Use Scenario: Dual-fan module in Layer 3 Ethernet switch with 48V PoE-powered backplane and shared thermal zone.

IC Role / Device Role / Timing Role: Compact SOT89-5 variant used for space-constrained fan control with direct thermal pad mounting to heatsink.

Use Value: 156°C/W θ_JA enables full 500mA output at +60°C ambient-critical for fan redundancy in sealed chassis.

Equivalent & Alternatives

The following parts are listed as comparable options for similar Hall-effect BLDC motor controller applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
AH2985	Successor device with extended V_DD range (3.3–24V), lower I_DD (1.5mA typ), and improved B_OP consistency (±15% vs ±50%)	Supports 3.3V logic-compatible systems and tighter magnetic tolerance requirements	Select AH2985 for new designs requiring lower quiescent current or tighter magnetic hysteresis control
ZXBM5212	Three-phase driver with external Hall inputs; no integrated sensor; higher output current (1A peak); requires external amplification	Used where multi-pole motors or custom magnet placement demands flexible sensor positioning	Choose ZXBM5212 when system-level Hall sensor location or phase count exceeds AH284's two-phase fixed architecture

Compared with AH2985 and ZXBM5212, the AH284 offers lowest component count for simple two-coil fans but lacks 3.3V compatibility and external sensor flexibility-making it optimal for cost-sensitive, volume 12V cooling applications where design reuse is prioritized over future scalability.

Availability

AH284 is available at Aetrix Electronics and suitable for server chassis cooling, industrial PLC fan modules, medical diagnostic equipment ventilation, and network switch heat sink applications requiring stable component supply despite its NRND status.

Supply support for AH284 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 AH284 belongs to Diodes' Hall-effect motor controller product line, designed specifically for cost-effective, self-contained BLDC fan control in thermally constrained environments where reliability and minimal external components are critical.

FAQ

Is the AH284 still in production?

No-the AH284 is officially marked "OBSOLETE – PART DISCONTINUED" and "NOT RECOMMENDED FOR NEW DESIGN USE" in Diodes' documentation. However, Aetrix Electronics maintains legacy inventory and supports existing production programs with traceable, date-code-controlled stock and lifecycle coordination services.

Can the AH284 drive three-phase BLDC motors?

No-it is strictly a two-phase (DO/DOB) controller optimized for two-coil BLDC fans. Its functional block diagram, truth table, and pinout confirm only two complementary outputs and no third-phase logic or drive capability. Three-phase operation requires devices like the AH2985 or ZXBM5212.

What is the purpose of the NC pin on the SOT89-5 package?

The NC pin on the SOT89-5 variant is physically present but electrically unconnected-no internal bond wire or silicon node ties to it. It must remain floating and unconnected on the PCB; routing traces or applying solder paste to this pin may cause mechanical stress or unintended thermal coupling without electrical benefit.

How does rotor lock protection interact with external PWM speed control?

Rotor lock detection operates independently of external PWM signals applied to Vdd-it monitors Hall transitions regardless of supply modulation. If PWM duty cycle drops below the minimum required to sustain rotation (typically <15%), lock detection triggers after 0.6s and forces output shutdown until full Vdd is restored and rotation resumes.

AH284-PL-B Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: *

Package/Case:: -

Packaging:: Bulk

Product Status:: Active

Motor Type - Stepper:: -

Motor Type - AC, DC:: -

Function:: -

Output Configuration:: -

Interface:: -

Technology:: -

Step Resolution:: -

Applications:: -

Current - Output:: -

Voltage - Supply:: -

Voltage - Load:: -

Operating Temperature:: -

Grade:: -

Qualification:: -

Mounting Type:: -

Supplier Device Package:: -

AH284-PL-B FAQ

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

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

The price and inventory of AH284-PL-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-PL-B is usually 5 days.

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

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

Note: Certain payment methods may incur a processing fee.

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

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

Once your AH284-PL-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-PL-B?

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

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

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

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

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

Return procedure for AH284-PL-B:

1.Submit a request within 90 days.

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

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