STMicroelectronics STMPS2141STR

Overview

STMPS2141STR from STMicroelectronics is a 500 mA rated, active-low enable, high-side N-channel MOSFET power switch in SOT23-5L package, featuring thermal and short-circuit protection with open-drain FAULT output, 2.7–5.5 V operating range, and 12 µA standby current. It delivers robust power distribution for capacitive-load hot-swap applications in USB peripherals and embedded I/O subsystems.

For engineers reviewing the STMPS2141STR datasheet, STMPS2141STR pinout, STMPS2141STR application, or STMPS2141STR equivalent, key selection criteria include its 135 mΩ R_ON at 5 V, 10 ms fault blanking window, UVLO threshold (2.35 V rising), reverse current blocking capability, and compatibility with CMOS/TTL logic levels.

Technical Context

The STMPS2141STR integrates an N-channel high-side MOSFET with internal current-limiting circuitry that activates at ~600 mA (120% of 500 mA rating), entering constant-current mode during overloads. Its thermal shutdown triggers at 135 °C junction temperature and recovers autonomously after cooling below 125 °C.

It implements undervoltage lockout (UVLO) with 2.35 V turn-on threshold and 100 mV hysteresis, ensuring clean enable/disable behavior across supply transients. The FAULT pin asserts low only after 10 ms fault blanking for overcurrent events-excluding immediate assertion for UVLO or die overtemperature faults.

Key Specifications

Pinout & Package

SOT23-5L package: 5-pin surface-mount, small-footprint, thermally enhanced plastic case with exposed drain pad (pin 6 internally connected to OUT in SO-8/MSOP8 variants; not present in SOT23-5L).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-side power switch applications.

Compared with TPS22965DSGR and AP22653AW-7, the STMPS2141STR uniquely combines integrated FAULT signaling, 10 ms blanking, UVLO, and thermal shutdown in a single SOT23-5L package-making it optimal for safety-critical or field-deployed systems requiring autonomous fault response.

Availability

STMPS2141STR is available at Aetrix Electronics and suitable for USB peripheral power control, industrial I/O module protection, embedded subsystem isolation, and portable diagnostic equipment requiring stable component supply and long-term production support.

Supply support for STMPS2141STR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power management ICs, sensors, and automotive-grade components.

The STMPS series targets robust, low-pin-count power distribution in space-constrained applications-designed specifically for hot-swap resilience, fault autonomy, and seamless integration into industrial and consumer power architectures.

FAQ

What is the maximum allowable output capacitance for reliable hot-swap operation?

The STMPS2141STR supports up to 100 µF output capacitance with stable startup under worst-case conditions (5 V input, 500 mA load). Its 10 ms fault blanking window accommodates typical inrush durations for this capacitance; larger values require external soft-start circuitry or reduced current limit configuration.

Does the FAULT pin require an external pull-up resistor?

Yes-the FAULT pin is open-drain and must be pulled up to a logic-compatible voltage (e.g., 3.3 V or 5 V) with a resistor between 1 kΩ and 10 kΩ. Pull-up value affects rise time and noise immunity; 4.7 kΩ is recommended for general-purpose use with standard MCU GPIO inputs.

Can STMPS2141STR drive inductive loads such as relays or solenoids?

Yes-but only with external flyback diode across the load. The device lacks internal clamp diodes; inductive kickback exceeding absolute maximum ratings (V_OUT ≤ V_IN + 0.3 V) will cause permanent damage. Diode selection must ensure clamping within safe voltage limits during turn-off.

How does the device behave during input voltage ramp-up?

During VIN ramp-up, the STMPS2141STR remains disabled until VIN exceeds the UVLO rising threshold (2.35 V). Once enabled, it applies full gate drive only after internal regulators stabilize-ensuring controlled output rise time and preventing premature loading of downstream circuits.