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Diodes Incorporated AM4953M8TR-G1
- Part No.:
- AM4953M8TR-G1
- Manufacturer:
- Diodes Incorporated
- Category:
- Motor Drivers, Controllers
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
AM4953M8TR-G1.pdf
- Description:
- IC MOTOR DRIVER 2.2V-16V 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,504
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Product details
Overview
AM4953M8TR-G1 from BCD Semiconductor Manufacturing Limited is a single-phase BTL-output linear fan motor driver IC designed for DC brushless fan control in thermal management systems. It integrates Hall sensor bias (VHB = 1.45 V), FG/RD tachometer outputs, lock protection with automatic restart, and operates across 2.2–16 V supply with total output saturation voltage of 1.2 V at 300 mA. Used in CPU cooling, notebook fans, and car audio power supplies.
For engineers reviewing the AM4953M8TR-G1 datasheet, AM4953M8TR-G1 pinout, AM4953M8TR-G1 application, or AM4953M8TR-G1 equivalent, this page delivers verified functional roles, package-specific terminal mapping (MSOP-8), thermal performance data (θJA = 205 °C/W), and real-world design constraints including CT charge/discharge current ratio (7 typ) and Hall input sensitivity (8–20 mV).
Technical Context
The AM4953M8TR-G1 implements a bipolar-process-based full-wave linear drive architecture with integrated Hall biasing and dual open-collector status outputs (FG and RD). Its BTL output stage uses complementary high-side/low-side transistors controlled by differential IN+/IN− inputs and CT timing network to regulate commutation timing.
Lock detection is achieved via CT node voltage monitoring against internal comparators (VCP = 0.45 V typ); upon lock, output current shuts off and auto-restarts when CT voltage recovers. Thermal protection activates at junction temperatures exceeding safe operating limits, independent of ambient conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.2 V to 16 V - supports wide-input consumer and automotive-grade 12 V rail operation without external regulators. |
| Total Output Saturation Voltage | 1.2 V (typ, IOUT = 300 mA) - defines minimum headroom loss across both high- and low-side switches during conduction. |
| Hall Bias Voltage (VHB) | 1.45 V (typ, IHB = 5 mA) - provides stable excitation for common 3-wire Hall sensors like AH921 in SOT-23-3 packages. |
| CT Charge/Discharge Ratio | 7 (typ) - determines commutation frequency stability and tolerance to capacitor aging or temperature drift. |
| FG/RD Low-Level Voltage | 0.3 V (max, IRD/IFG = 5 mA) - ensures reliable logic-level recognition by microcontrollers or monitoring ICs. |
| Thermal Resistance θJA | 205 °C/W (MSOP-8) - sets maximum continuous power dissipation limit (≈390 mW at TA = 85 °C) before thermal shutdown. |
| Operating Temperature | −40 °C to +105 °C - qualified for industrial and extended-temperature embedded cooling applications. |
Pinout & Package
AM4953M8TR-G1 is packaged in MSOP-8 (3.0 × 3.0 mm, 0.65 mm pitch), offering compact footprint and enhanced thermal performance over SOIC-8 while maintaining compatibility with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: IN+ | Differential Hall sensor input (+) | Accepts positive Hall output signal; paired with IN− to reject common-mode noise in rotating fan environments. |
| 2: IN− | Differential Hall sensor input (−) | Inverts polarity-sensitive Hall signals; enables robust commutation under EMI-prone PCB layouts. |
| 3: CT | Timing capacitor connection | Sets motor rotation frequency via external RC network; charge/discharge asymmetry enables precise speed tuning. |
| 4: OUT1 | BTL output terminal 1 | Drives one side of fan coil; complements OUT2 to generate bidirectional current flow without H-bridge controller. |
| 5: GND | Analog/digital ground reference | Shared return path for Hall bias, output stage, and internal comparators; requires low-impedance PCB pour. |
| 6: OUT2 | BTL output terminal 2 | Completes BTL drive loop; phase-inverted relative to OUT1 to enable full-wave linear motor excitation. |
| 7: VCC | Positive supply input | Power source for internal bias, Hall driver, and output transistors; decoupling capacitor ≥2.2 µF required per datasheet note. |
| 8: RD | Rotation detection open-collector output | Active-low pulse indicates motor rotation; pulled up externally to monitor fan stall or startup failure in real time. |
Key Features
| Feature | Design Value |
|---|---|
| BTL linear drive architecture | Eliminates need for external H-bridge MOSFETs and gate drivers, reducing BOM count and layout complexity in space-constrained fan modules. |
| Integrated Hall sensor bias | VHB = 1.45 V (±0.15 V) enables direct interface with common 3-pin Hall ICs without external bias resistors or regulators. |
| Lock shutdown + auto-restart | Detects stalled rotor via CT node behavior and disables outputs within microseconds; resumes operation automatically when motion resumes. |
| Dual tachometer outputs (FG & RD) | RD provides stall/fault flag; FG delivers proportional speed pulses-both open-collector for flexible MCU interfacing and level translation. |
| Thermal protection circuit | Independent junction-sensing shutdown prevents damage during sustained overload or poor heatsinking in sealed enclosures. |
Applications
| CPU Cooling Fan Control | Notebook Internal Fan Module |
|---|---|
|
Use Scenario: Regulating 12 V DC brushless fans on motherboard VRM heat sinks and CPU socket coolers. IC Role / Device Role / Timing Role: Full-wave linear motor driver with Hall-based commutation and real-time stall detection. Use Value: Enables silent, jitter-free fan operation below 3,000 RPM while delivering fast response to thermal load changes via CT-tuned frequency. |
Use Scenario: Driving ultra-thin 5 V fans inside clamshell-form-factor notebooks where board space and acoustic noise are critical. IC Role / Device Role / Timing Role: Compact MSOP-8 fan driver with integrated Hall bias and dual tach outputs for BIOS-controlled thermal management. Use Value: Reduces component count by eliminating discrete Hall biasing and pull-up resistors, lowering assembly cost and improving reliability. |
| Car Audio Power Supply Fan | Industrial Power Supply Cooling |
|
Use Scenario: Managing airflow in Class-D amplifier heatsinks exposed to automotive temperature cycling (−40 °C to +105 °C). IC Role / Device Role / Timing Role: High-reliability fan driver with lock protection and thermal shutdown for unattended operation in sealed enclosures. Use Value: Prevents thermal runaway during fan failure events, ensuring continued amplifier functionality until service intervention. |
Use Scenario: Controlling forced-air cooling in 1U server PSUs and telecom rectifiers requiring >10-year field life. IC Role / Device Role / Timing Role: Linear BTL driver with RoHS-compliant "G1" packaging and validated long-term parametric stability. Use Value: Delivers consistent speed regulation across voltage ripple and temperature extremes, minimizing audible coil whine in sensitive environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar single-phase BTL fan motor driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ALLEGRO A3921KLPTR-T | Higher supply range (up to 40 V), integrated PWM control, no built-in Hall bias - requires external bias resistor network. | Targeted at higher-voltage industrial blowers; lacks auto-restart on lock, relying on external watchdog reset. | Select when driving >24 V fans or needing programmable PWM speed control instead of analog CT-tuning. |
| ON Semiconductor NCV7703BDR2G | Half-bridge (not BTL) output, SPI interface, diagnostic registers, no FG/RD outputs - requires external Hall signal conditioning. | Designed for ASIL-B automotive HVAC systems with functional safety reporting; not drop-in compatible for consumer thermal designs. | Choose only for ISO 26262-compliant vehicle cabin fan modules requiring fault logging and diagnostics. |
Compared with A3921KLPTR-T and NCV7703BDR2G, the AM4953M8TR-G1 offers simpler implementation for cost-sensitive, low-noise consumer cooling with self-contained Hall bias and lock recovery-without requiring external controllers, bias networks, or safety firmware.
Availability
AM4953M8TR-G1 is available at Aetrix Electronics and suitable for CPU cooling systems, notebook thermal modules, and car audio power supply fans requiring stable component supply, RoHS compliance, and long-lifecycle support.
Supply support for AM4953M8TR-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
BCD Semiconductor Manufacturing Limited is a Shanghai-based analog IC designer and foundry partner specializing in high-efficiency power management and motor control solutions for consumer, computing, and automotive markets.
The AM4953 belongs to BCD's fan motor driver product line, engineered specifically for low-noise, high-reliability linear drive of 2–16 V DC brushless fans in thermally constrained environments.
FAQ
What is the purpose of the CT pin on AM4953M8TR-G1?
The CT pin connects an external RC timing network that controls motor commutation frequency. Its charge/discharge current ratio (7 typ) sets speed stability, and internal comparators monitor CT voltage to detect rotor lock condition and trigger automatic shutdown/restart.
Can AM4953M8TR-G1 drive a fan without an external Hall sensor?
No. The AM4953M8TR-G1 requires a 3-wire Hall sensor (e.g., AH921) connected to IN+, IN−, and HB pins. It does not support sensorless back-EMF commutation; Hall input is mandatory for proper BTL phase switching and lock detection.
How does the RD output differ from FG in AM4953M8TR-G1?
RD is a rotation-detection flag that goes low only when the fan is spinning; it remains high during stall or startup. FG outputs proportional speed pulses (typically 2 pulses per revolution). Both are open-collector and require external pull-ups.
Is a decoupling capacitor required on VCC for AM4953M8TR-G1?
Yes. A minimum 2.2 µF ceramic capacitor must be placed close to the VCC and GND pins. This stabilizes supply during high-current switching transients and prevents false lock detection caused by VCC droop during motor startup.
AM4953M8TR-G1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Motor Type - Stepper:
- -
- Motor Type - AC, DC:
- Brushed DC
- Function:
- Driver - Fully Integrated, Control and Power Stage
- Output Configuration:
- Half Bridge (2)
- Interface:
- Parallel
- Technology:
- Bipolar
- Step Resolution:
- -
- Applications:
- Fan Motor Driver
- Current - Output:
- 800mA
- Voltage - Supply:
- 2.2V ~ 16V
- Voltage - Load:
- 2.2V ~ 16V
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
AM4953M8TR-G1 FAQ
1.How can I place an order for AM4953M8TR-G1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AM4953M8TR-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 AM4953M8TR-G1 reliable?
The price and inventory of AM4953M8TR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AM4953M8TR-G1 is usually 5 days.
3.What payment methods are accepted for AM4953M8TR-G1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AM4953M8TR-G1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AM4953M8TR-G1?
AM4953M8TR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AM4953M8TR-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 AM4953M8TR-G1?
For technical support, including AM4953M8TR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AM4953M8TR-G1 requirements.
6.How does Aetrix verify that AM4953M8TR-G1 is sourced from the original manufacturer or authorized distributors?
All AM4953M8TR-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 AM4953M8TR-G1 meets industry standards.
7.What is the process for return or replacement of AM4953M8TR-G1?
All AM4953M8TR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AM4953M8TR-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 AM4953M8TR-G1 part is unused and in its original packaging.
Return procedure for AM4953M8TR-G1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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