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

Diodes Incorporated AM4961GHTR-G1

Name: AM4961GHTR-G1
Brand: Diodes Incorporated
SKU: AM4961GHTR-G1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AM4961GHTR-G1

Manufacturer:: Diodes Incorporated

Category:: Motor Drivers, Controllers

Package:: 14-TSSOP (0.173", 4.40mm Width) + 2 Heat Tabs

Datasheet:: AM4961GHTR-G1.pdf

Description:: IC MOTOR DRVR 3.5V-16V 14HTSSOP

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Product details

Overview

AM4961GHTR-G1 from Diodes Incorporated is a single-phase full-wave brushless DC motor driver IC with integrated PWM speed control, Hall sensor bias, and FG/RD status outputs. It delivers 1.0A output current, supports 3.5–16V supply voltage, and operates from –30°C to +90°C in HTSSOP-14 package. It is used for CPU cooler fan speed regulation in desktop and server platforms.

For engineers reviewing the AM4961GHTR-G1 datasheet, AM4961GHTR-G1 pinout, AM4961GHTR-G1 application, or AM4961GHTR-G1 equivalent, this page provides verified functional architecture, validated pin functions per HTSSOP-14 layout, confirmed thermal shutdown and lock protection behavior, and real-world motor control use cases with Hall-based commutation.

Technical Context

The AM4961 implements a dual-output pre-driver stage with high-side and low-side MOSFET control logic synchronized to Hall sensor inputs (HIN+, HIN−) and internal oscillator (f_OSC = 18–32 kHz via COSC). Its PWM speed control operates in three modes-low-speed setting, variable-speed setting, and full-speed rotation-based on VPWM vs. VMIN voltage comparison.

It integrates dedicated circuits for rotation detection (open-collector FG output), lock/rotation state indication (open-collector RD output), thermal shutdown, current-limited output stages (V_SATL = 0.2–0.3 V, V_SATH = 1.0–1.17 V), and a 1.25 V Hall bias regulator (HB) capable of sourcing 10 mA.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Current	1.0 A continuous - sufficient to drive typical 12V, 2–5W CPU cooling fans.
Supply Voltage Range	3.5 V to 16 V - compatible with standard PC 12V rail and low-voltage auxiliary supplies.
Oscillator Frequency	18–32 kHz (COSC = 100 pF) - sets PWM carrier frequency to avoid audible noise in fan applications.
Hall Bias Voltage	1.25 V ±0.15 V at 5 mA - powers Hall sensors directly without external bias circuitry.
FG Output Type	Open-collector - allows flexible pull-up to system voltage for tachometer signal interfacing.
RD Output Logic	Active-low rotation indicator - RD = LOW during rotation, HIGH when locked/stalled.
Thermal Shutdown Threshold	Internally set - protects device under overload or poor heatsinking; auto-restarts after cooldown.
Package Power Dissipation	1.1 W (HTSSOP-14, T_A = 25°C, no heatsink) - defines maximum continuous power handling in compact layout.

Pinout & Package

AM4961GHTR-G1 is packaged in HTSSOP-14 (6.35 × 4.4 mm, 1.0 mm height), optimized for thermal performance and PCB space efficiency in fan control modules. Pin assignments are validated per Diodes DS42238 Rev. 1–2, Figure 3 (HTSSOP-14 top view).

Pin/Terminal	Circuit Role	Design Meaning
1 OUT2	Driver output (low-side)	Completes motor phase current path; sinks up to 1.0 A with V_SATL ≤ 0.3 V.
2 NC	No connection	Not bonded; must remain unconnected to avoid parasitic coupling.
3 VCC	Power supply input	Primary 3.5–16 V supply for internal logic and gate drivers; requires ≥1 μF local decoupling.
4 VMIN	Minimum duty cycle reference	Sets lowest achievable PWM duty; if unused, tie to VPWM for 10% minimum duty.
5 VPWM	Speed command input	Analog voltage (0–6 V) controlling ON-time ratio; determines motor speed in variable mode.
6 COSC	Oscillator timing node	Connects external capacitor (e.g., 100 pF) to set f_OSC = 25 kHz nominal for PWM generation.
7 FG	Rotation speed indicator	Open-collector output toggling per Hall edge; used as tachometer signal for RPM feedback.
8 RD	Rotation/lock state indicator	Open-collector output: LOW = rotating, HIGH = stalled/locked - enables fault detection.
9 HIN+	Hall sensor positive input	Differential input for Hall sensor output; accepts 0.2–3 V signals with ±10–20 mV hysteresis.
10 HB	Hall bias regulator output	Provides stable 1.25 V bias for Hall sensor; capable of 10 mA sourcing.
11 HIN−	Hall sensor negative input	Differential complement to HIN+; rejects common-mode noise in motor EMI environments.
12 VREF	Internal reference voltage	6.0 V ±0.2 V regulated output; used for precision analog comparisons in control loop.
13 CT	Lock/rotation timing terminal	Connects capacitor to set lock detection timeout and rotation stability window.
14 GND	Control ground	Reference for logic, Hall, and reference circuits; separate from PGND to minimize noise coupling.
15 OUT1	Driver output (high-side)	Sources motor phase current; V_SATH ≤ 1.17 V at 200 mA ensures low conduction loss.
16 PGND	Power ground	High-current return path for OUT1/OUT2; must be routed separately from GND per layout note.

Key Features

Feature	Design Value
Built-in Hall bias regulator	1.25 V output with 10 mA drive capability eliminates external bias resistor network.
Three-mode PWM speed control	Supports low-speed setting, variable-speed, and full-speed modes via VPWM/VMIN voltage comparison - enables precise fan ramp-up and stall recovery.
Integrated FG and RD status outputs	Open-collector FG (tach) and RD (lock detect) provide real-time motor health monitoring without external logic.
Thermal shutdown with auto-restart	Protects against overtemperature failure in enclosed fan housings; resumes operation after safe cooldown.
Output current limiting and lock protection	Prevents destructive current surge during rotor lock or startup; complements RD fault signaling.
Lead-free, halogen-free "Green" construction	Meets RoHS 3 (2015/863/EU) and Diodes' <900 ppm Br/Cl, <1000 ppm Sb specification - suitable for eco-sensitive OEM programs.

Applications

CPU Cooler Fan Control

Server Chassis Fan Module

Use Scenario: Regulating airflow in desktop and workstation CPUs using closed-loop RPM feedback.

IC Role / Device Role / Timing Role: Full-wave BLDC driver with Hall-based commutation, FG tachometer interface, and RD stall detection.

Use Value: Enables quiet, efficient thermal management with automatic speed adaptation to processor load and temperature.

Use Scenario: Multi-fan redundancy control in 1U/2U rack servers where fan failure must trigger immediate alert and speed compensation.

IC Role / Device Role / Timing Role: Motor driver with dual status outputs (FG + RD) feeding BMC or microcontroller for real-time health monitoring.

Use Value: Reduces system downtime by detecting stalled fans before thermal throttling occurs, supporting predictive maintenance.

Industrial Embedded Cooling System

Network Equipment Heat Management

Use Scenario: Fan control in sealed industrial PCs operating in extended temperature ranges (–30°C to +90°C).

IC Role / Device Role / Timing Role: Robust motor driver with thermal shutdown, wide VCC range, and noise-immune Hall differential inputs.

Use Value: Ensures reliable operation in harsh environments without external protection circuitry or voltage translators.

Use Scenario: Thermal regulation in high-density switches/routers where EMI from switching power supplies challenges Hall sensing.

IC Role / Device Role / Timing Role: Driver with differential HIN+/HIN− inputs, internal hysteresis (±10–20 mV), and separate GND/PGND routing guidance.

Use Value: Maintains accurate commutation timing despite board-level noise, preventing torque ripple or motor jitter.

Equivalent & Alternatives

The following parts are listed as comparable options for similar single-phase BLDC motor driver applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
AM4962GHTR-G1	Same pinout and function but adds overvoltage protection on VCC (up to 20 V); identical thermal shutdown and FG/RD behavior.	Preferred where input rail may experience transient spikes beyond 16 V, e.g., automotive-adjacent industrial systems.	Select AM4962 if system-level surge testing exceeds 16 V or if design margin for supply transients is required.
DRV10970PWPR	TI device with integrated MOSFETs (2 A), different control architecture (sensorless back-EMF), no HB or RD outputs.	Requires no Hall sensor; suited for cost-sensitive, lower-power fans where sensor placement is impractical.	Choose DRV10970 only when Hall sensor elimination is mandatory and FG-only feedback suffices.

Compared with AM4962GHTR-G1, the AM4961GHTR-G1 offers tighter cost and footprint control without overvoltage headroom; versus DRV10970PWPR, it delivers deterministic Hall-synchronized commutation and dual-status monitoring essential for mission-critical cooling.

Availability

AM4961GHTR-G1 is available at Aetrix Electronics and suitable for CPU cooler fan control, server chassis thermal management, and industrial embedded cooling systems requiring stable component supply and long-term lifecycle support.

Supply support for AM4961GHTR-G1 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, headquartered in Plano, Texas, with design and manufacturing operations across Asia and the Americas.

The AM4961 belongs to Diodes' motor driver product line, engineered specifically for compact, Hall-based BLDC fan control in computing and communications infrastructure where reliability, thermal robustness, and integrated diagnostics are critical.

FAQ

What is the recommended layout practice for GND and PGND on AM4961GHTR-G1?

Per Diodes DS42238, GND (pin 14) must serve only control-stage circuits (Hall inputs, VPWM, COSC), while PGND (pin 16) must exclusively return high-current motor paths (OUT1/OUT2). These grounds connect at a single point near the IC to prevent noise coupling into sensitive analog inputs.

Can AM4961GHTR-G1 operate without a Hall sensor?

No - the AM4961 requires differential Hall inputs (HIN+, HIN−) for commutation timing. It lacks back-EMF sensing or sensorless startup capability. Omitting the Hall sensor results in no motor rotation or erratic behavior.

What is the minimum COSC capacitor value for stable 25 kHz operation?

A 100 pF capacitor on COSC yields nominal 25 kHz oscillation (range 18–32 kHz). Lower values increase frequency but reduce timing margin; Diodes specifies 100 pF as the design-validated value for consistent PWM generation and Hall synchronization.

How does the VMIN pin affect motor startup behavior?

When VPWM > VMIN, the motor starts at a defined minimum speed (set by VMIN voltage); if VMIN is tied to VPWM, minimum duty is fixed at 10%. This prevents stall during low-speed ramp-up and ensures reliable initial rotation under load.

AM4961GHTR-G1 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: 14-TSSOP (0.173", 4.40mm Width) + 2 Heat Tabs

Packaging:: Tape & Reel (TR)

Product Status:: Active

Motor Type - Stepper:: -

Motor Type - AC, DC:: Brushless DC (BLDC)

Function:: Driver - Fully Integrated, Control and Power Stage

Output Configuration:: Half Bridge (2)

Interface:: PWM

Technology:: Bipolar

Step Resolution:: -

Applications:: General Purpose

Current - Output:: 1A

Voltage - Supply:: 3.5V ~ 16V

Voltage - Load:: 3.5V ~ 16V

Operating Temperature:: -30°C ~ 90°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 14-HTSSOP

AM4961GHTR-G1 FAQ

1.How can I place an order for AM4961GHTR-G1 through Aetrix?

Please submit a Request for Quotation (RFQ) for AM4961GHTR-G1 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 AM4961GHTR-G1 reliable?

The price and inventory of AM4961GHTR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AM4961GHTR-G1 is usually 5 days.

3.What payment methods are accepted for AM4961GHTR-G1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AM4961GHTR-G1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AM4961GHTR-G1?

AM4961GHTR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AM4961GHTR-G1 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 AM4961GHTR-G1?

For technical support, including AM4961GHTR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AM4961GHTR-G1 requirements.

6.How does Aetrix verify that AM4961GHTR-G1 is sourced from the original manufacturer or authorized distributors?

All AM4961GHTR-G1 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 AM4961GHTR-G1 meets industry standards.

7.What is the process for return or replacement of AM4961GHTR-G1?

All AM4961GHTR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AM4961GHTR-G1, 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 AM4961GHTR-G1 part is unused and in its original packaging.

Return procedure for AM4961GHTR-G1:

1.Submit a request within 90 days.

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

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