The A3938 is a three-phase brushless DC motor controller designed to drive N-channel MOSFETs with a 50 V supply voltage. It integrates a bootstrapped high-side driver, low-side synchronous rectification, and adjustable dead time for cross-conduction protection. The device features internal PWM current control, fault diagnostic output, thermal shutdown, and undervoltage protection. It supports Hall sensor inputs for 120-degree commutation and offers selectable coast or dynamic brake modes on power-down. The part is housed in a 38-pin TSSOP package, with a maximum junction temperature of 150°C and an operating ambient temperature range of -20°C to 85°C. It meets RoHS standards with a lead-free, matte tin-plated leadframe. Thermal resistance is 51°C/W for a 4-layer PCB under JEDEC standard 51-2.
Manufacturer: Allegro MicroSystems, LLC
Win Source Part Number: 112631-A3938SLDTR-T
Packaging: Reel - TR
Applications: General Purpose
Mounting: SMD (SMT)
Technology: Power MOSFET
Motor Type - AC, DC: Brushless DC (BLDC)
Family Name: A3938S
Categories: Integrated Circuits
Status: Active
Temperature Range - Operating: -20°C to 85°C (TA)
Case / Package: 38-TSSOP
Purpose: Controller - Commutation, Direction Management
Supply Voltage - Operating: 18 V to 50 V
Alternative Parts (Cross-Reference): A3938SLDTR; A3938SLD; A3938SEQ; A3938SLQ;
Introduction Date: November 07, 2002
ECCN: EAR99
Country of Origin: Thailand
Estimated EOL Date: 2025
Halogen Free: Compliant
Is this a common-used part?: Yes
Popularity: High
Fake Threat In the Open Market: 43 pct.
Supply and Demand Status: Limited
| Win Source Electronics | |
|---|---|
| Product Category | Power MOSFET |
| Product Number | 112631-A3938SLDTR-T |
| Product Name | PMIC - PMIC - Motor Drivers, Controllers - A3938SLDTR-T |
| TJ | -20 to 85 C (-4 to 185 F) |
