This document describes the absolute maximum ratings and characteristics of the A3955SB (DIP) and A3955SLB (SOIC) chips. These chips are designed for driving bipolar stepper motors, with continuous output currents of ±1.5A and operating voltages of 50V.
The A3955SB (DIP) and A3955SLB (SOIC) are full‑bridge PWM microstepping motor drivers designed to drive one winding of a bipolar stepper motor. The device provides ±1.5 A continuous output current, up to 50 V supply voltage, and supports slow, fast, and mixed current‑decay modes for flexible microstepping control.
The datasheet includes detailed electrical characteristics, functional block diagrams, terminal descriptions, control circuitry parameters, thermal protection information, and mechanical dimensions for both package styles. It also outlines typical application guidelines for stepper‑motor drive systems.
| Continuous Output Current | ±1.5 A |
|---|---|
| Maximum Output Voltage | 50 V |
| Logic Supply Voltage | 7.0 V |
| Operating Temperature Range | -20 °C to +85 °C |
| Junction Temperature (max) | +150 °C |
| Package Types | 16‑pin DIP (A3955SB) and 16‑lead SOIC (A3955SLB) |
| Thermal Shutdown Temperature | 165 °C |
The driver can supply a continuous output current of ±1.5 A.
It is rated for load supply voltages up to 50 V.
The device is offered in a 16‑pin DIP package (A3955SB) and a 16‑lead SOIC package (A3955SLB).