STMicroelectronics STMPS2242TTR

Overview

STMPS2242TTR from STMicroelectronics is a dual-channel high-side power distribution switch featuring two 100 mΩ MOSFETs, 500 mA continuous current per channel, independent active-low enable inputs, and integrated thermal/overcurrent protection. It operates from 2.7 V to 5.5 V and delivers fault reporting via open-drain OC1/OC2 outputs - ideal for USB port power management and hot-swap-capable peripheral rails in embedded industrial controllers.

For engineers reviewing the STMPS2242TTR datasheet, STMPS2242TTR pinout, STMPS2242TTR application, or STMPS2242TTR equivalent, key selection criteria include its 500 mA per-channel current limit, active-low enable logic, SO-8 package compatibility, and 10 ms fault blanking for capacitive load turn-on transients.

Technical Context

The STMPS2242TTR integrates two independent high-side switches with dedicated EN1/EN2 (active-low) control and open-drain OC1/OC2 fault indicators. Each channel employs current-limiting and thermal shutdown circuitry that forces constant-current mode during overloads and disables the output when junction temperature exceeds 135 °C.

It features undervoltage lockout (2.0–2.5 V threshold), reverse current blocking when disabled, and 10 ms fault blanking to suppress false OC assertions during hot-plug events. Input logic is CMOS/TTL compatible, with VIH ≥ 2.0 V and VIL ≤ 0.4 V at 2.7–4.5 V supply.

Key Specifications

Pinout & Package

STMPS2242TTR is housed in an SO-8 surface-mount package (JEDEC MS-012AC, 3.9 mm × 4.9 mm), with exposed pad for thermal enhancement and RoHS-compliant matte tin lead finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPL9202DR and TPS2051BDR, STMPS2242TTR uniquely combines dual active-low control, 10 ms fault blanking, thermal shutdown with hysteresis, and reverse current blocking - making it optimal for space-constrained, reliability-critical hot-swap applications where coordinated multi-rail fault handling is essential.

Availability

STMPS2242TTR is available at Aetrix Electronics and suitable for USB power distribution, industrial I/O module design, and embedded system power sequencing requiring stable component supply and long-term manufacturability.

Supply support for STMPS2242TTR 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, specializing in power management, microcontrollers, and analog ICs for industrial, automotive, and consumer markets.

The STMPS series targets robust power distribution in electrically noisy environments - designed specifically for hot-swap-capable systems requiring fault-tolerant, multi-channel load switching with minimal external components.

FAQ

What is the logic polarity of the enable inputs on STMPS2242TTR?

The EN1 and EN2 pins are active-low inputs: driving either pin below 0.4 V (at V_IN = 2.7–4.5 V) turns on the corresponding channel, while pulling above 2.0 V disables it. This matches common microcontroller GPIO defaults and simplifies direct interfacing without level-shifting.

Does STMPS2242TTR support reverse current blocking when powered down?

Yes - when V_IN = 0 V or the switch is disabled, the internal MOSFET body diode is reverse-biased and the output presents high impedance, preventing reverse current flow from OUT to IN. This protects upstream supplies during maintenance or partial system power-down.

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

Fault blanking applies only to overcurrent events; thermal shutdown and UVLO faults assert OCx immediately without delay. If a short persists beyond 10 ms, OCx goes low and remains low until the fault clears - even if thermal shutdown subsequently activates, the OC signal stays asserted.

Can STMPS2242TTR drive a 1000 µF output capacitor safely?

Yes - the 2.5 ms typical rise time and built-in current limiting prevent destructive inrush. At 5 V input, peak inrush into 1000 µF is limited to ~500 mA, resulting in ~5 ms RC-limited ramp time. Layout best practices (local ceramic + bulk capacitance) are recommended to minimize voltage droop.