STMicroelectronics STMPS2161MTR

Overview

STMPS2161MTR from STMicroelectronics is a 1000 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 operation, and 12 µA standby current. It delivers robust power distribution for hot-swap-capable USB ports, industrial I/O modules, and embedded system rail switching.

For engineers reviewing the STMPS2161MTR datasheet, STMPS2161MTR pinout, STMPS2161MTR application, or STMPS2161MTR equivalent, this page provides verified functional context, validated pin roles, confirmed protection timing (10 ms fault blanking), real R_ON (135 mΩ at 5 V), and direct alternative comparisons for load-switch selection in 5 V/3.3 V systems.

Technical Context

The STMPS2161MTR implements a thermally protected high-side switch with integrated current-limit sensing and automatic fault recovery. Its overcurrent response enters constant-current mode at ~1200 mA (120% of 1000 mA rating), while junction temperature shutdown activates at 135 °C and recovers autonomously below 125 °C.

It features undervoltage lockout (UVLO) with rising threshold at 2.25 V ±0.15 V and hysteresis of 150 mV, plus reverse current blocking when disabled - preventing backfeed from V_OUT to V_IN during off-state or unpowered conditions.

Key Specifications

Pinout & Package

SOT23-5L package: 5-pin surface-mount, 1.3 mm × 2.9 mm footprint, 1.45 mm height, 191 °C/W junction-to-ambient thermal resistance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPL7407LDR and TPS22965DSGR, the STMPS2161MTR uniquely combines 1000 mA capability, integrated FAULT reporting, thermal shutdown, and UL recognition - making it the only choice among the three for safety-compliant, hot-swap-capable 5 V rail switching.

Availability

STMPS2161MTR is available at Aetrix Electronics and suitable for USB peripheral power management, industrial I/O isolation, and embedded rail sequencing requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for STMPS2161MTR 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 analog devices for automotive, industrial, and consumer markets.

The STMPS series targets robust, protection-rich power distribution in space-constrained applications - specifically engineered for hot-swap resilience, fault transparency, and regulatory compliance in industrial and medical equipment.

FAQ

What is the minimum input voltage required for reliable operation?

The STMPS2161MTR features undervoltage lockout (UVLO) with a rising threshold of 2.25 V ±0.15 V. Below this level, the switch remains disabled and asserts FAULT immediately. Reliable turn-on occurs only when VIN exceeds 2.4 V, ensuring stable gate drive and protection circuit functionality across temperature and process variation.

Does the device support reverse current blocking when powered down?

Yes - when EN is high (disabled) or VIN = 0 V, the output presents high impedance, preventing reverse current flow from VOUT to VIN. This behavior is explicitly characterized in Section 3.4 of the datasheet and applies regardless of VOUT voltage up to VIN + 0.3 V, satisfying IEC 61000-4-5 and system-level backfeed requirements.

How does the 10 ms fault blanking interact with thermal shutdown?

Fault blanking applies only to overcurrent events; thermal faults trigger FAULT immediately without blanking. If a short-circuit causes rapid heating, the device may enter current-limit mode first, then assert FAULT after 10 ms if the condition persists - but if junction temperature reaches 135 °C before that, thermal shutdown overrides and FAULT asserts instantly, bypassing the timer.

Can the FAULT pin drive an LED directly without a current-limiting resistor?

No - the FAULT pin is an open-drain output rated for 8 mA sink current. Driving an LED directly risks exceeding this limit and damaging the internal transistor. A series resistor (e.g., 1 kΩ with 3.3 V pull-up) is mandatory to limit current to ≤3 mA, ensuring long-term reliability and compatibility with standard logic interfaces.