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A4987SESTR-T Breakout
STEPPER MOTOR DRIVER DUAL BRIDGE 35V 1A 24QFN
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The A4987 is a dual full-bridge DMOS stepper motor driver with PWM current regulators supporting 3.3V to 5.5V logic. Each bridge handles ±1A output at up to 35V with mixed decay mode for reduced noise and power dissipation. Integrated protection includes thermal shutdown, UVLO, overcurrent sensing, and short-circuit detection, making it ideal for NEMA stepper motor control applications.
Package: QFN-24 (4×4mm) · 24 pins
Why does this need a breakout?
This 0.5mm pitch QFN is nearly impossible to hand solder and entirely incompatible with breadboards due to hidden pads beneath the package. A breakout board provides accessible headers and pre-soldered connections, letting you prototype with InvenSense motion sensors via I2C or SPI without specialized SMD equipment or rework skills.
Component specifications
ELECTRICAL CHARACTERISTICS
| Manufacturer | Allegro MicroSystems |
| Part Number | A4987SESTR-T |
| Package | QFN-24 (4×4mm) |
| Pin Count | 24 |
| Current - Output | 1A |
| Interface | Parallel |
| Output Configuration | Half Bridge (4) |
| Voltage - Load | 8V ~ 35V |
| Voltage - Supply | 3V ~ 5.5V |
What's Included
BILL OF MATERIALS
- 1x A4987SESTR-T soldered onto breakout PCB
- Pin headers pre-soldered (2.54mm / 0.1" pitch)
- All IC pins broken out to 2.54mm headers
Breakout Board Design
PCB SPECIFICATIONS