STMPS2151STR

Overview

The STMPS2151STR is an enhanced single-channel high-side power distribution switch manufactured by STMicroelectronics. It incorporates a 90 mΩ N-channel MOSFET for efficient power switching in applications prone to heavy capacitive loads and short circuits. The device operates within a voltage range of 2.7 V to 5.5 V and supports a continuous output current of 500 mA with an 800 mA current limit threshold. It features a 120 mΩ maximum on-resistance and is housed in a compact SOT-23-5 surface-mount package.

Feature Summary

• Integrates thermal protection that automatically shuts off the switch during excessive junction temperature rise due to continuous overloads or short circuits, with automatic recovery upon cooling.
• Provides reverse current protection to prevent backflow from the load side to the supply input when the switch is disabled.
• Includes fault blanking circuitry to ignore transient events, ensuring stable operation during startup or capacitive load charging phases.

Applications

• Power management systems requiring protection against heavy capacitive loads
• High-side switching for peripheral devices in automotive electronics
• Industrial control units needing reliable short-circuit handling

Procurement Notes

Verify the specific suffix STR indicates tape and reel packaging configuration. Confirm the component matches the original STMicroelectronics datasheet specifications for the STMPS2151 series. Ensure the operating environment stays within the -40°C to +85°C ambient temperature range. Check for UL recognition file E354278 if safety certification is required for the end application.

Selection Notes

Select this component when a single-channel high-side switch with integrated current limiting and thermal shutdown is required. It is suitable for CMOS and TTL compatible logic inputs. Consider the 500 mA continuous current rating and 90 mΩ on-resistance for efficiency requirements. Verify that the SOT-23-5 package fits the available PCB space constraints.

Part Context

The STMPS2151STR belongs to the STMPS21x1 family of enhanced power distribution switches from STMicroelectronics. This family includes variants like STMPS2141, STMPS2161, and STMPS2171, which share similar protection features but differ in current ratings. The STMPS2151 specifically targets the 500 mA continuous current segment of this product line.

Replacement Considerations

STMPS2141STR (500mA), STMPS2161STR (1A), STMPS2171STR (1A). Verify current ratings and pin compatibility before substitution.

FAQ

How does the STMPS2151STR handle short-circuit conditions?

When a short circuit occurs, the device limits the output current to a safe level by switching into constant current mode. If the condition persists and causes overheating, thermal protection shuts the switch off until the temperature cools sufficiently.

Is the enable input compatible with standard logic families?

Yes, the logic enable input is compatible with both CMOS and TTL logic levels, allowing direct interfacing with various microcontrollers and logic gates.