STMicroelectronics STMPS2171TTR

Overview

STMPS2171TTR from STMicroelectronics is a 1000 mA active-high enable high-side N-channel MOSFET power switch with integrated thermal and short-circuit protection, 90 mW R_ON, 2.7–5.5 V input range, and open-drain FAULT output - used in USB port power management and hot-swap circuits for industrial I/O modules.

For engineers reviewing the STMPS2171TTR datasheet, STMPS2171TTR pinout, STMPS2171TTR application, or STMPS2171TTR equivalent, key selection criteria include continuous current rating (1000 mA), enable polarity (active-high), fault blanking duration (10 ms), R_ON at 5 V (135 mΩ), and SO-8 package thermal resistance (160 °C/W).

Technical Context

The STMPS2171TTR implements a thermally protected high-side switch with constant-current limiting during overloads: when output current exceeds ~1200 mA (120% of rated 1000 mA), it enters foldback mode to clamp power dissipation. Its internal UVLO circuit disables the switch if VIN drops below 2.1 V (typ.) and re-enables only after hysteresis recovery.

Fault detection combines time-blanked overcurrent response (10 ms blanking window) with immediate assertion for die overtemperature (>135 °C) and undervoltage events. The FAULT pin is open-drain, requiring external pull-up, and signals all fault types except transient sub-10 ms shorts.

Key Specifications

Pinout & Package

STMPS2171TTR is housed in an SO-8 package (ECOPACK® compliant, 160 °C/W junction-to-ambient thermal resistance), optimized for PCB heat spreading via exposed pad soldering. Pin 1 is EN; pins 6–8 are paralleled OUT terminals for low-inductance, high-current routing.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS2051BDR and AP22653WM-7, STMPS2171TTR uniquely balances 1000 mA drive, SO-8 thermal performance, active-high enable, and diagnostic FAULT output - making it optimal for industrial and medical systems requiring both robustness and serviceability.

Availability

STMPS2171TTR is available at Aetrix Electronics and suitable for industrial I/O modules, medical peripheral ports, automotive BCM subsystems, and programmable logic controller designs requiring stable component supply, long-term lifecycle assurance, and UL-recognized safety compliance.

Supply support for STMPS2171TTR 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 silicon solutions for automotive, industrial, and power management applications since 1987.

The STMPS series targets robust, low-component-count power distribution in harsh environments - specifically engineered for hot-swap resilience, fault diagnostics, and regulatory compliance in industrial and medical equipment.

FAQ

What is the maximum allowable ambient temperature for continuous 1000 mA operation in SO-8 package?

At 1000 mA and 5 V input, power dissipation is 135 mW. With SO-8 thermal resistance of 160 °C/W, junction-to-ambient rise is 21.6 °C. Assuming 125 °C max junction temperature, maximum ambient is 103.4 °C - verified in Table 6 of the datasheet under "Maximum ambient temperature (at junction temperature 125 °C)".

Does STMPS2171TTR support reverse-voltage protection when the output is biased above input?

No. Reverse current blocking applies only when the switch is disabled (EN = low) or unpowered (VIN = 0 V). If EN = high and VOUT > VIN, reverse current flows through the body diode - this condition is explicitly prohibited in Section 3.4 and may cause damage or uncontrolled power transfer.

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

Fault blanking applies only to overcurrent events. Thermal faults (junction >135 °C) and UVLO events assert FAULT immediately, with no blanking delay. The 10 ms timer starts only upon current-limit detection and resets on each new current-limit event - ensuring persistent overloads trigger FAULT after timeout.

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

No. The FAULT pin is open-drain with 20 mA absolute maximum sink current. Driving an LED requires a series resistor (e.g., 1 kΩ for ~3 mA at 3.3 V) to limit current and prevent latch-up or parametric shift. Datasheet Figure 15 shows typical FAULT sink characteristics confirming voltage drop vs. current.