A3903EEETR-T

Overview

The A3903EEETR-T is a low-voltage brushed DC motor driver manufactured by Allegro MicroSystems. It features a full-bridge output configuration with a peak output current rating of 500 mA. The device operates within an input voltage range of 3 V to 5.5 V and includes integrated source-side linear regulation for constant voltage operation. It supports adjustable constant voltage or PWM control modes. The component is housed in an 8-lead DFN package (2mm x 2mm) with an exposed thermal pad, designated by the EE suffix. It offers a standby mode with supply current below 500 nA and functions across a temperature range of -40°C to +85°C.

Feature Summary

• Integrates a full-bridge output with source-side linear regulation to maintain constant coil voltage despite battery variations.
• Provides comprehensive internal protection including overtemperature shutdown, undervoltage lockout, and cross-current protection.
• Supports flexible control interfaces allowing direction, braking, and standby modes via logic inputs with optional PWM capability.

Applications

• Robot actuators and pump systems
• Portable printers and scanners
• Camera lens and shutter control mechanisms

Procurement Notes

Verify that the specific part number A3903EEETR-T matches the required 8-lead DFN package with the EE suffix for the exposed thermal pad variant. Confirm that the operating voltage range of 3 V to 5.5 V aligns with the target system's power supply constraints. Ensure the 500 mA output current capacity is sufficient for the intended motor load. Check RoHS compliance status if environmental regulations apply to the final assembly.

Selection Notes

Select this component for applications requiring a compact solution for low-voltage brushed DC motors where space is limited. The 2mm x 2mm DFN package is suitable for portable devices such as handheld scanners or camera modules. Consider the integrated linear regulation if stable motor voltage is critical under varying battery conditions. Evaluate the standby current requirement against battery life expectations, noting the sub-500 nA consumption in sleep mode.

Part Context

The A3903 series represents Allegro MicroSystems' low-voltage motor driver family designed for portable electronics. The A3903EEETR-T specifically denotes the tape-and-reel version of the 8-lead DFN package. This series is engineered to simplify motor control designs by integrating both logic and power stages into a single small footprint, reducing component count and board area compared to discrete solutions.

Replacement Considerations

The A3903EEWTR-P is a pin-compatible alternative using a SOIC-W package. Verify package dimensions and thermal characteristics when substituting, as the DFN and SOIC packages differ significantly in physical size and heat dissipation properties.