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Diodes Incorporated AM4961AGHTR-G1
- Part No.:
- AM4961AGHTR-G1
- Manufacturer:
- Diodes Incorporated
- Category:
- Motor Drivers, Controllers
- Package:
- 14-TSSOP (0.173", 4.40mm Width) + 2 Heat Tabs
- Datasheet:
-
AM4961AGHTR-G1.pdf
- Description:
- IC MOTOR DRVR 3.5V-16V 14HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,325
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Product details
Overview
AM4961AGHTR-G1 from Diodes Incorporated is a single-phase full-wave BLDC motor driver IC with integrated H-bridge, Hall bias circuit, rotor lock protection, FG tachometer output, and RD lock-detect alarm. It operates from 3.5V to 16V, delivers 1A peak output current, supports speed control via PWM/DC/thermistor inputs, and targets 12V cooling fans in PCs and instrumentation. Its HTSSOP-14 package enables compact thermal management for fan motor drive applications.
For engineers reviewing the AM4961AGHTR-G1 datasheet, AM4961AGHTR-G1 pinout, AM4961AGHTR-G1 application, or AM4961AGHTR-G1 equivalent, key selection criteria include integrated Hall bias voltage (1.25V), FG frequency generator output timing, CT capacitor-based lock-detect timing (TLCKDET = C4 × 1 µs/pF), and dual-package availability (HTSSOP-14/GH vs. SSOP-16/GS).
Technical Context
The AM4961AGHTR-G1 implements sensor-based commutation using differential Hall inputs (HIN+, HIN−) with ±20 mV hysteresis and a dedicated 1.25 V Hall bias regulator (HB). Its internal oscillator generates a 25 kHz triangle wave (COSC = 100 pF) compared against VPWM or VMIN to set PWM duty cycle for speed control.
Rotor lock detection relies on CT pin capacitor charging (ICHG = 2 µA) and discharging (IDHG = 0.2 µA); lock detection time TLCKDET and auto-restart delay TOFF scale linearly with CT capacitance (e.g., 0.47 µF yields TLCKDET ≈ 0.47 s, TOFF ≈ 4.7 s). Thermal shutdown activates at 176°C and recovers at 148°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.5 V to 16 V - supports standard 12 V fan rails with 2 V headroom margin for ripple and drop. |
| Peak Output Current | 1 A - sufficient for driving typical 12 V, ≤3 W BLDC cooling fans without external MOSFETs. |
| H-Bridge Saturation | VSATH = 1.17 V, VSATL = 0.3 V - limits conduction loss to ≤1.2 W at 1 A, enabling HTSSOP-14 thermal performance (PD = 1.1 W). |
| Oscillator Frequency | 25 kHz (COSC = 100 pF) - sets PWM carrier frequency above audible range while minimizing switching loss. |
| Hall Bias Voltage | 1.25 V (IHB = 5 mA) - directly powers unbuffered 4-pin Hall sensors without external biasing components. |
| Reference Voltage | 6.0 V (IREF = 5 mA) - supplies stable reference for VMIN minimum-speed divider networks. |
| FG & RD Outputs | Open-drain, 10 mA sink capability - interfaces directly with 3.3 V/5 V microcontrollers using standard pull-up resistors. |
Pinout & Package
AM4961AGHTR-G1 is packaged in thermally enhanced HTSSOP-14 (GH package), with exposed power pad (PGND) for improved heat dissipation. Pin 1 is OUT2; Pin 14 is GND. The package supports reflow soldering and achieves 1.1 W power dissipation at +25°C ambient without heatsink.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT1 / OUT2 | H-bridge power outputs | Drive motor coil terminals; OUT1 connects to coil end A, OUT2 to coil end B; PGND pin (14) returns high-current path. |
| HIN+ / HIN− | Differential Hall sensor inputs | Detect rotor position; accept ≥50 mV peak differential signal with ±20 mV hysteresis to reject noise during commutation. |
| HB | Hall bias regulator output | Supplies 1.25 V @ 5 mA to unbuffered Hall elements; eliminates need for external bias resistor network. |
| VPWM / VMIN | Speed control & minimum speed inputs | VPWM accepts 1.95–3.6 V DC (for 12 V supply) to set 0–100% duty; VMIN clamps lowest speed by overriding VPWM when higher. |
| FG / RD | Feedback outputs | FG outputs Hall-commutation frequency (tachometer); RD pulls low during rotor lock - both open-drain, require external pull-ups. |
| CT | Lock-detect timing terminal | Capacitor (e.g., 0.47 µF) sets TLCKDET (lock detect) and TOFF (auto-restart delay) via internal 2 µA/0.2 µA charge/discharge currents. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Hall bias regulator | 1.25 V output eliminates external bias resistor network and improves Hall signal SNR in noisy fan environments. |
| Rotor lock protection with auto-restart | CT capacitor programmable lock-detect time (TLCKDET) and fixed 10× longer TOFF enable reliable stall recovery without system intervention. |
| Three-speed control modes | Accepts external PWM (converted to DC), analog DC voltage, or thermistor-based voltage divider - supports temperature-compensated fan curves. |
| Thermal shutdown with hysteresis | Shuts down at 176°C junction; resumes operation at 148°C - prevents thermal runaway during overload or blocked airflow. |
| Dual-package option | HTSSOP-14 (GH) offers 1.1 W power dissipation; SSOP-16 (GS) provides alternate layout flexibility with identical functionality. |
Applications
| CPU Cooler Fan Control | Instrumentation Cooling System |
|---|---|
|
Use Scenario: Regulating fan speed in desktop/laptop CPU coolers based on thermal sensor feedback. IC Role / Device Role / Timing Role: BLDC motor driver with Hall-based commutation, FG tachometer feedback, and RD lock alarm for system-level fault reporting. Use Value: Enables closed-loop thermal management using VPWM input tied to ADC output of thermal sensor, with VMIN preventing stall at low temperatures. |
Use Scenario: Maintaining stable airflow across precision analog circuitry in test equipment and medical devices. IC Role / Device Role / Timing Role: Motor controller providing rotation status (RD), speed telemetry (FG), and thermal-safe operation in sealed enclosures. Use Value: Rotor lock detection halts fan drive before coil overheating occurs; thermal shutdown (176°C) protects against enclosure heat buildup. |
| Server Rack Blower Module | Industrial Extractor Fan |
|
Use Scenario: Driving high-reliability 12 V blowers in telecom and data center chassis with remote monitoring. IC Role / Device Role / Timing Role: Smart fan driver delivering FG pulses for RPM calculation and RD alarm for predictive maintenance alerts. Use Value: FG output frequency directly correlates to motor RPM (1 pulse per Hall transition); RD low-state triggers BMC interrupt for immediate diagnostics. |
Use Scenario: Controlling exhaust fans in factory automation systems where dust ingress may cause mechanical seizure. IC Role / Device Role / Timing Role: Robust motor driver with programmable CT-based lock timeout and auto-restart to recover from transient blockages. Use Value: CT = 0.47 µF sets TLCKDET = 0.47 s - fast enough to detect stall before coil damage, yet avoids false triggers from vibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar BLDC motor driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ALLEGRO A4962KLPTR-T | Higher 2.5 A peak current; requires external Hall bias; no integrated VREF or CT-based lock timer. | Targets higher-power blowers (>5 W); lacks auto-restart - lock condition requires MCU reset. | Select when >1 A output or discrete Hall bias control is needed; not drop-in due to pinout and feature mismatch. |
| TI DRV10983RSMT | 3-phase driver; sensorless startup; no Hall inputs or RD/FG pins; integrates LDO and SPI interface. | Designed for quiet, low-EMI 3-phase fans; unsuitable for Hall-sensored single-phase systems like AM4961A. | Choose only for new 3-phase designs; incompatible with existing Hall sensor infrastructure or FG/RD monitoring architecture. |
Compared with A4962KLPTR-T and DRV10983RSMT, the AM4961AGHTR-G1 uniquely combines Hall bias, FG/RD outputs, and CT-programmable lock recovery in a single-phase 1 A solution - making it optimal for cost-sensitive, sensor-based 12 V fan control where reliability and diagnostic visibility are critical.
Availability
AM4961AGHTR-G1 is available at Aetrix Electronics and suitable for CPU cooler fan control, instrumentation cooling systems, server rack blower modules, and industrial extractor fan applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for AM4961AGHTR-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 integrated circuits, specializing in power management, signal integrity, and motor control solutions for industrial, computing, and consumer markets.
The AM4961A belongs to Diodes' motor driver product line, engineered specifically for cost-effective, high-reliability single-phase BLDC fan control with built-in diagnostics, thermal safety, and flexible speed-setting interfaces.
FAQ
What Hall sensor types are compatible with AM4961AGHTR-G1?
The AM4961AGHTR-G1 supports both 4-pin unbuffered Hall elements (biased by HB pin at 1.25 V, differential signal applied to HIN+/HIN−) and 3-pin buffered Hall switches (output connected to HIN+, HIN− biased at VREF/2 via external divider). Minimum differential input amplitude is 50 mV peak; hysteresis is ±20 mV.
How is external PWM converted to VPWM-compatible DC voltage?
An external PWM signal is converted using transistor Q1, resistors R1–R8, and capacitor C2 (0.33 µF) as shown in the typical application circuit. This RC integrator produces a DC voltage proportional to PWM duty cycle, scaled to 1.95–3.6 V range for 12 V supply - matching VPWM's required input window for 0–100% speed control.
Can VMIN be left unconnected, and what is its default behavior?
VMIN must not be left floating. If minimum speed limiting is not required, connect VMIN directly to VPWM - this configures the device to default to 10% minimum output duty. Leaving VMIN open causes undefined speed regulation and potential instability due to internal comparator uncertainty.
What is the maximum allowable value for the CT capacitor, and why?
The CT capacitor should not exceed 1 µF. Larger values extend TLCKDET and TOFF beyond practical recovery windows (e.g., CT = 1 µF gives TLCKDET ≈ 1 s, TOFF ≈ 10 s), increasing risk of prolonged fan stoppage during transient stalls. Diodes specifies 0.47 µF as optimal for balancing fast lock detection and reliable auto-restart.
AM4961AGHTR-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:
- Obsolete
- 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
AM4961AGHTR-G1 FAQ
1.How can I place an order for AM4961AGHTR-G1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AM4961AGHTR-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 AM4961AGHTR-G1 reliable?
The price and inventory of AM4961AGHTR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AM4961AGHTR-G1 is usually 5 days.
3.What payment methods are accepted for AM4961AGHTR-G1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AM4961AGHTR-G1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AM4961AGHTR-G1?
AM4961AGHTR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AM4961AGHTR-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 AM4961AGHTR-G1?
For technical support, including AM4961AGHTR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AM4961AGHTR-G1 requirements.
6.How does Aetrix verify that AM4961AGHTR-G1 is sourced from the original manufacturer or authorized distributors?
All AM4961AGHTR-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 AM4961AGHTR-G1 meets industry standards.
7.What is the process for return or replacement of AM4961AGHTR-G1?
All AM4961AGHTR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AM4961AGHTR-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 AM4961AGHTR-G1 part is unused and in its original packaging.
Return procedure for AM4961AGHTR-G1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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