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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Power Distribution Switches, Load Drivers

STMicroelectronics STMPS2161TTR

Name: STMPS2161TTR
Brand: STMicroelectronics
SKU: STMPS2161TTR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STMPS2161TTR

Manufacturer:: STMicroelectronics

Category:: Power Distribution Switches, Load Drivers

Package:: 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)

Datasheet:: STMPS2161TTR.pdf

Description:: IC PWR SWITCH N-CHAN 1:1 8MSOP

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Product details

Overview

STMPS2161TTR 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 operating range, and open-drain FAULT output - used for hot-swap-capable USB peripheral power distribution in industrial control modules.

For engineers reviewing the STMPS2161TTR datasheet, STMPS2161TTR pinout, STMPS2161TTR application, or STMPS2161TTR equivalent, this device is selected for robust load switching where capacitive inrush, short-circuit resilience, fault reporting, and low quiescent current (12 µA) are critical design requirements.

Technical Context

The STMPS2161TTR implements a thermally protected high-side switch with constant-current limiting at ~1200 mA during overloads, automatic thermal shutdown at 135 °C junction temperature, and immediate FAULT assertion on undervoltage (UVLO) or die overtemperature events. It features 10 ms fault blanking to suppress false triggers during hot-swap transients.

Its CMOS/TTL-compatible EN input controls switch state, while the open-drain FAULT pin signals active-low faults after blanking timeout. Reverse current blocking prevents backflow when disabled or unpowered, and UVLO ensures reliable turn-off below 2.1 V (typ.) with 200 mV hysteresis.

Key Specifications

Parameter	Value and Actual Design Meaning
Continuous Output Current	1000 mA - supports sustained loads like USB hubs or FPGA I/O banks without external current sensing.
R_ON (at 5 V)	135 mΩ - limits conduction loss to ≤675 mW at full load, enabling compact thermal design in SOT23-5L.
Fault Blanking Time	10 ms - suppresses FAULT assertion during hot-swap inrush or brief capacitive transients.
Supply Current (Standby)	12 µA max - enables always-on monitoring in battery-backed systems without significant drain.
UVLO Threshold	2.1 V (rising), 1.9 V (falling) - prevents erratic switching near brown-out conditions with 200 mV hysteresis.
Operating Voltage Range	2.7–5.5 V - compatible with 3.3 V and 5 V logic rails and legacy industrial supply domains.
Ambient Temperature Range	−40 to +85 °C - qualified for extended industrial environments without derating.
ESD Protection	8 kV HBM - withstands handling and board-level ESD events without external protection diodes.

Pinout & Package

STMPS2161TTR is packaged in SOT23-5L - a 5-pin, surface-mount, lead-free package with 0.95 mm pitch, optimized for space-constrained PCB layouts and automated assembly.

Pin/Terminal	Circuit Role	Design Meaning
1 (OUT)	Power Switch Output	High-side switched output node; connects to load; supports reverse current blocking when disabled.
2 (EN)	Active-Low Enable Input	CMOS/TTL-compatible logic input; drives switch ON when pulled low; internal pull-up not present.
3 (FAULT)	Open-Drain Fault Indicator	Asserts low during overcurrent (after blanking), UVLO, or overtemperature; requires external pull-up.
4 (GND)	Power Ground Reference	Return path for load current and internal circuitry; must be low-impedance for stable protection response.
5 (IN)	Input Power Supply	2.7–5.5 V main rail input; supplies both switch channel and internal logic; decoupling recommended.

Key Features

Feature	Design Value
Integrated Thermal Shutdown	Junction shutdown at 135 °C with automatic recovery at ≤125 °C - eliminates need for external thermal sensors or reset logic.
Current Limit with Blanking	120% of rated current (1200 mA) limit + 10 ms blanking - tolerates hot-plug surges without false fault latching.
Reverse Current Blocking	Hi-Z output state when disabled or unpowered - prevents backfeed from downstream loads into VIN rail.
Undervoltage Lockout (UVLO)	2.1 V turn-on / 1.9 V turn-off with hysteresis - ensures clean, glitch-free enable/disable transitions across supply droop.
Low Standby Current	12 µA max ICC in disabled state - extends battery life in always-connected portable instrumentation.

Applications

USB Peripheral Power Management

Industrial I/O Module Protection

Use Scenario: Hot-plugging USB peripherals (e.g., cameras, sensors) into embedded controllers with limited bus current budget.

IC Role / Device Role / Timing Role: High-side power switch controlling VBUS delivery; FAULT pin feeds microcontroller interrupt for dynamic port disable.

Use Value: Prevents host bus overcurrent shutdown by limiting peak inrush to 1200 mA and blanking transient spikes.

Use Scenario: Protecting programmable logic controller (PLC) digital output channels driving solenoids or relays.

IC Role / Device Role / Timing Role: Load-switching element with real-time fault reporting; EN tied to PLC output enable register.

Use Value: Enables automatic channel isolation during short-circuit events without requiring external current sense amplifiers.

FPGA Configuration Power Sequencing

Medical Sensor Subsystem Isolation

Use Scenario: Sequenced power-up of FPGA I/O banks requiring independent voltage domain control and fault containment.

IC Role / Device Role / Timing Role: Independent high-side switch per bank; FAULT monitored via FPGA GPIO to halt configuration on fault.

Use Value: Limits single-bank failure propagation and provides deterministic power-on timing with <100 µs turn-on delay.

Use Scenario: Isolating analog sensor front-ends (e.g., ECG, pulse oximetry) from main MCU supply to reduce noise coupling.

IC Role / Device Role / Timing Role: Low-noise, low-leakage power gate; reverse blocking prevents sensor bias leakage paths.

Use Value: Achieves <1 nA off-state leakage and 135 mΩ R_ON to maintain signal integrity and battery runtime.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TPS2051BDBVR	500 mA rated, 120 mΩ R_ON, no FAULT pin, fixed 3.3/5 V UVLO	Lacks fault reporting and thermal shutdown; suited only for non-critical, low-current loads	Select only if FAULT signaling and >700 mA load capability are unnecessary.
AP22653WU-7	1200 mA rated, 85 mΩ R_ON, active-high EN, FAULT with 20 ms blanking	Higher current rating but incompatible EN polarity and longer blanking time affects hot-swap responsiveness	Prefer when higher current headroom is needed and EN logic can be inverted in firmware.

Compared with TPS2051BDBVR and AP22653WU-7, STMPS2161TTR uniquely balances 1000 mA capability, precise 10 ms blanking, active-low EN compatibility with legacy microcontrollers, and integrated thermal protection - making it optimal for industrial hot-swap interfaces where fault observability and reliability are non-negotiable.

Availability

STMPS2161TTR is available at Aetrix Electronics and suitable for USB peripheral management, industrial I/O protection, FPGA power sequencing, and medical sensor subsystem isolation requiring stable component supply and long-term manufacturability.

Supply support for STMPS2161TTR 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 analog, power, microcontroller, and sensor solutions for industrial, automotive, and consumer markets.

The STMPS series targets robust power distribution in harsh environments - engineered specifically for applications demanding fault resilience, hot-swap tolerance, and minimal external component count in space-constrained designs.

FAQ

What is the maximum allowable ambient temperature for continuous 1000 mA operation in SOT23-5L?

At 1000 mA and 5 V input, power dissipation is 135 mW. With SOT23-5L's 191 °C/W thermal resistance and 125 °C max junction temperature, the maximum ambient temperature is 99.2 °C - verified per Table 4 in the datasheet under "SOT23-5L" column for STMPS2161.

Does STMPS2161TTR support reverse current blocking when the switch is ON?

No. Reverse current blocking is only guaranteed when the switch is OFF (EN high) or unpowered (VIN = 0 V). If a voltage higher than VIN is applied to OUT while the switch is ON, reverse current flows - this condition is explicitly prohibited in the datasheet Section 3.4.

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

During a short-circuit, the device enters constant-current mode (~1200 mA). If the fault persists beyond the 10 ms blanking window, FAULT asserts low. Die overtemperature or UVLO faults trigger FAULT immediately - without blanking - as stated in Section 3.1 and Table 3.

Can STMPS2161TTR be used with 2.5 V input supply?

No. The minimum operating input voltage is 2.7 V per Section 5.2 (Table 8). At 2.5 V, UVLO remains active and the switch stays disabled - confirmed by UVLO rising threshold of 2.1 V (typ.) and required 200 mV hysteresis margin.

STMPS2161TTR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Package/Case:: 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)

Series:: -

Packaging:: Tape & Reel (TR)

Product Status:: Active

Switch Type:: General Purpose

Number of Outputs:: 1

Ratio - Input:Output:: 1:1

Output Configuration:: High Side

Output Type:: N-Channel

Interface:: On/Off

Voltage - Load:: 2.7V ~ 5.5V

Voltage - Supply (Vcc/Vdd):: Not Required

Current - Output (Max):: 1A

Rds On (Typ):: 110mOhm

Input Type:: Non-Inverting

Features:: -

Fault Protection:: Current Limiting (Fixed), Over Temperature, Reverse Current, UVLO

Operating Temperature:: -40°C ~ 125°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-MSOP

STMPS2161TTR FAQ

1.How can I place an order for STMPS2161TTR through Aetrix?

Please submit a Request for Quotation (RFQ) for STMPS2161TTR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for STMPS2161TTR reliable?

The price and inventory of STMPS2161TTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STMPS2161TTR is usually 5 days.

3.What payment methods are accepted for STMPS2161TTR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STMPS2161TTR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STMPS2161TTR?

STMPS2161TTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STMPS2161TTR order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for STMPS2161TTR?

For technical support, including STMPS2161TTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STMPS2161TTR requirements.

6.How does Aetrix verify that STMPS2161TTR is sourced from the original manufacturer or authorized distributors?

All STMPS2161TTR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that STMPS2161TTR meets industry standards.

7.What is the process for return or replacement of STMPS2161TTR?

All STMPS2161TTR units undergo pre-shipment inspection (PSI). If there is an issue with STMPS2161TTR, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The STMPS2161TTR part is unused and in its original packaging.

Return procedure for STMPS2161TTR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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