STMicroelectronics STMPS2151TTR

Overview

STMPS2151TTR from STMicroelectronics is a 500 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 operating 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 STMPS2151TTR datasheet, STMPS2151TTR pinout, STMPS2151TTR application, or STMPS2151TTR equivalent, key selection criteria include enable polarity, current-limit threshold accuracy, fault blanking duration, thermal shutdown recovery behavior, and reverse-current blocking capability under disabled conditions.

Technical Context

The device implements a current-limited high-side switch with fixed 10 ms fault blanking to suppress false FAULT assertions during capacitive load turn-on transients. Its overcurrent response enters constant-current mode at ~600 mA (120% of 500 mA rated current), followed by thermal shutdown if junction temperature exceeds 135 °C.

UVLO disables the switch when VIN drops below 2.25 V (rising) or 2.1 V (falling), with hysteresis ensuring clean re-enabling. The FAULT pin asserts low immediately for UVLO or overtemperature events, but only after blanking for overcurrent faults - enabling robust system-level fault classification.

Key Specifications

Pinout & Package

SOT23-5L package: compact 5-pin surface-mount outline with exposed pad for thermal enhancement; footprint per ST's DocID013793 Rev 7 Figure 54.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TCK10AG and TPS22922E, STMPS2151TTR uniquely combines FAULT reporting, 10 ms blanking, and UL recognition - making it optimal for safety-critical industrial and medical power distribution where reliable fault discrimination is mandatory.

Availability

STMPS2151TTR is available at Aetrix Electronics and suitable for USB power management, industrial I/O protection, embedded power sequencing, and point-of-load enable control requiring stable component supply across multi-year production cycles.

Supply support for STMPS2151TTR 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 components for industrial, automotive, and consumer markets.

The STMPS21xx family targets robust, low-cost power distribution in space-constrained applications - emphasizing fault resilience, ease of integration, and regulatory compliance for industrial control and computing peripherals.

FAQ

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

The 10 ms fault blanking prevents false FAULT assertions during brief inrush currents caused by hot-swapping capacitive loads or power-up transients. It allows the device to enter current-limit mode temporarily without triggering system-level fault handling - only persistent overcurrent (>10 ms) causes FAULT pin assertion.

Can STMPS2151TTR block reverse current when the switch is off?

Yes - when disabled (EN = low) or unpowered (VIN = 0 V), the output presents high impedance, preventing reverse current flow from VOUT to VIN. However, reverse current is not blocked when the switch is ON and VOUT > VIN, which is an undefined operating condition and must be avoided.

How does the thermal shutdown and recovery behavior work?

When junction temperature exceeds 135 °C, the device shuts OFF immediately and holds OFF until temperature falls below 125 °C. No external reset or enable toggle is required - recovery is fully automatic and hysteresis-based to prevent oscillation near the trip point.

Is STMPS2151TTR compliant with safety standards for industrial use?

Yes - it is UL recognized (UL file E354278) and rated for operation from –40 °C to +85 °C ambient. Its integrated protections (UVLO, thermal shutdown, fault reporting) and 8 kV HBM ESD rating meet baseline requirements for industrial control and medical auxiliary power applications.