STMicroelectronics STMPS2161STR

Overview

STMPS2161STR from STMicroelectronics is a 1000 mA rated, active-low enable, high-side N-channel MOSFET power switch with integrated thermal and short-circuit protection, 90 mW R_ON, 2.7–5.5 V operation, and open-drain FAULT output - used in USB port power management, hot-swap circuits, and industrial I/O modules.

For engineers reviewing the STMPS2161STR datasheet, STMPS2161STR pinout, STMPS2161STR application, or STMPS2161STR equivalent, key selection criteria include current rating (1000 mA), enable polarity (active low), fault blanking duration (10 ms), UVLO thresholds (2.35 V rise / 2.25 V fall), and thermal shutdown behavior (135 °C trip, 125 °C recovery).

Technical Context

This device implements a single-channel high-side power switch with internal current limiting at ~1200 mA (120% of rated 1000 mA), automatic thermal shutdown at 135 °C junction temperature, and immediate FAULT assertion for overtemperature or UVLO events - unlike current-limit faults, which are blanked for 10 ms.

The control architecture uses CMOS/TTL-compatible EN input to drive an N-channel MOSFET with 135 mΩ typical R_ON at 5 V, reverse-current blocking when disabled, and undervoltage lockout with 100 mV hysteresis - all operating across –40 to +85 °C ambient.

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 thermal resistance - optimized for space-constrained USB and portable applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS2051BDR and AP22653AW-7, STMPS2161STR uniquely combines 1000 mA capacity, 10 ms fault blanking, UL recognition, and precise UVLO hysteresis - making it optimal for certified industrial and USB-compliant designs requiring deterministic fault response.

Availability

STMPS2161STR is available at Aetrix Electronics and suitable for USB power distribution, industrial I/O modules, and automotive body control applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for STMPS2161STR 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, specializing in power management, analog, microcontrollers, and automotive ICs - with over 40 years of industrial-grade reliability validation.

The STMPS series targets ruggedized power distribution in harsh environments - designed specifically for hot-swap, capacitive-load, and short-circuit-prone applications in industrial automation and embedded systems.

FAQ

What is the maximum continuous output current for STMPS2161STR?

The STMPS2161STR delivers 1000 mA continuous output current under recommended operating conditions (T_A ≤ 85 °C, V_IN = 5.5 V, SO-8 package). Derating applies above 85 °C ambient or in SOT23-5L due to higher thermal resistance (191 °C/W); full 1000 mA is not sustainable in SOT23-5L above 60 °C ambient.

How does the FAULT pin behave during a short-circuit event?

During a short circuit, the device enters constant-current mode (~1200 mA) and starts a 10 ms internal timer. If the fault persists beyond 10 ms, the open-drain FAULT pin pulls low. Transient shorts <10 ms (e.g., hot-swap inrush) do not assert FAULT. Overtemperature or UVLO faults trigger FAULT immediately, with no blanking.

Can STMPS2161STR block reverse current when disabled?

Yes - when EN is low or VIN = 0 V, the internal MOSFET is fully off and the OUT pin presents high impedance, preventing reverse current flow from V_OUT to V_IN. This is confirmed in Section 3.4 "Reversed current blocking" of the datasheet. However, reverse current is *not* blocked when the switch is ON and V_OUT > V_IN - that condition must be avoided.

What is the purpose of the 10 ms fault blanking feature?

The 10 ms fault blanking prevents false FAULT assertions during benign high-current transients - such as charging bulk capacitance at power-up or hot-insertion of USB devices. It allows the switch to sustain momentary overloads without interrupting operation, while still protecting against sustained faults. The blanking timer resets on each new overcurrent event.