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STMicroelectronics STMPS2171STR
- Part No.:
- STMPS2171STR
- Manufacturer:
- STMicroelectronics
- Package:
- SC-74A, SOT-753
- Datasheet:
-
STMPS2171STR.pdf
- Description:
- IC PWR SWITCH N-CHAN 1:1 SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:33,123
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Product details
Overview
STMPS2171STR 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 RON at 5 V, undervoltage lockout (UVLO), and reverse current blocking - used in USB port power management, industrial I/O modules, and hot-swap-capable peripheral distribution.
For engineers reviewing the STMPS2171STR datasheet, STMPS2171STR pinout, STMPS2171STR application, or STMPS2171STR equivalent, key selection criteria include rated output current (1000 mA), enable logic polarity (active-high), fault blanking duration (10 ms), thermal shutdown threshold (135 °C), and package-specific thermal resistance (160 °C/W for SO-8).
Technical Context
The STMPS2171STR implements a single-channel high-side power switch with CMOS/TTL-compatible EN input and open-drain FAULT output. It operates across 2.7–5.5 V input range and uses internal current limiting to clamp output at ~120% of rated current (1200 mA typ.) during overloads.
Fault response includes 10 ms blanking for transient overcurrents, immediate FAULT assertion for die overtemperature (>135 °C) or UVLO events, and automatic thermal recovery when junction cools below 125 °C. Reverse current blocking is enforced only when EN = low or VIN = 0 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Continuous Output Current | 1000 mA - supports stable power delivery to moderate-capacity capacitive loads (e.g., USB peripherals, sensor nodes) |
| RON (at 5 V) | 140 mΩ - limits conduction loss to ≤700 mW at full load, enabling use in thermally constrained SO-8 layouts |
| Enable Logic Polarity | Active-high - simplifies interface with microcontroller GPIOs without level-shifting or inversion logic |
| Fault Blanking Time | 10 ms - suppresses false FAULT assertions during hot-plug transients or inrush into large bulk capacitance |
| UVLO Threshold | 2.3 V (rising), 2.1 V (falling) - prevents erratic switching during brown-out conditions in battery-backed systems |
| Thermal Shutdown | 135 °C (junction), auto-recovery at 125 °C - protects against sustained overload without requiring external reset circuitry |
| Standby Supply Current | 12 µA max - enables ultra-low-power sleep mode in always-on system rails |
Pinout & Package
STMPS2171STR is packaged in SO-8 (small outline integrated circuit, 8-pin), offering superior thermal performance (θJA = 160 °C/W) versus SOT23-5L or MSOP8 variants - suitable for continuous 1 A operation in industrial ambient environments up to 102.6 °C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT) | Power Switch Output | Main high-side switched output node; connects to load; supports reverse current blocking when disabled |
| 2 (OUT) | Power Switch Output | Dual-output configuration improves current sharing and reduces trace inductance in high-current paths |
| 3 (OUT) | Power Switch Output | Third parallel output terminal enhances thermal derating margin and reduces voltage drop under full load |
| 4 (EN) | Enable Input | Active-high digital control signal; TTL/CMOS compatible; drives internal gate driver for N-MOSFET |
| 5 (FAULT) | Fault Indicator Output | Open-drain, active-low signal indicating overcurrent, overtemperature, or UVLO fault after blanking period |
| 6 (GND) | Ground Reference | Power and signal return path; must be low-impedance for accurate current sensing and thermal stability |
| 7 (IN) | Input Supply | Main 2.7–5.5 V power rail input; feeds internal regulator and gate driver; requires local decoupling |
| 8 (IN) | Input Supply | Dual IN pins reduce package parasitic inductance and improve supply integrity during fast load transients |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Thermal Protection | Auto-shutdown at 135 °C junction temperature with hysteresis-based recovery - eliminates need for external thermal sensors or reset logic |
| Reverse Current Blocking | Hi-Z output state when EN = low or VIN = 0 V - prevents backfeeding from downstream supplies in redundant or multi-rail systems |
| Fault Blanking | 10 ms programmable delay before FAULT assertion - tolerates hot-swap inrush and ESD-induced current spikes without false triggering |
| UL Recognition | UL file E354278 - validates safety compliance for end-equipment certification in industrial and medical applications |
| Low Standby Current | 12 µA maximum ICC in disabled state - extends battery life in portable equipment with standby power domains |
Applications
| USB Peripheral Power Switching | Industrial Digital I/O Module |
|---|---|
|
Use Scenario: Hot-plug detection and power sequencing for USB 2.0 peripherals in embedded controllers. IC Role / Device Role / Timing Role: High-side power switch controlling VBUS delivery with inrush limiting and short-circuit isolation. Use Value: 10 ms fault blanking prevents FAULT assertion during plug-in transients; 1000 mA rating supports bus-powered hubs and HID devices. |
Use Scenario: Isolated 24 V DC field power distribution to multiple solenoid or relay outputs. IC Role / Device Role / Timing Role: Protected channel driver enabling/disabling individual loads with fault reporting to PLC controller. Use Value: Open-drain FAULT pin directly interfaces with opto-isolated inputs; SO-8 thermal rating sustains 1 A at 85 °C ambient. |
| Medical Sensor Node Power Rail | Automotive Body Control Module (BCM) |
|
Use Scenario: Power gating for low-power biomedical sensors (ECG, SpO₂) in battery-operated wearable monitors. IC Role / Device Role / Timing Role: Load switch managing isolated analog front-end supply with reverse current prevention. Use Value: 12 µA standby current minimizes quiescent drain; reverse blocking avoids interference between sensor and MCU power domains. |
Use Scenario: Controlled power delivery to infotainment USB ports and interior lighting drivers in 12 V vehicle systems. IC Role / Device Role / Timing Role: High-side switch with UVLO and thermal foldback protecting against load dump and wiring faults. Use Value: UVLO thresholds (2.3 V rising) ensure clean turn-off during cranking; UL recognition satisfies automotive functional safety requirements. |
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 |
|---|---|---|---|
| TPS2051BDR | 500 mA rated current, 120 mΩ RON, no FAULT pin, fixed 2.7–5.5 V range | Lacks fault reporting and thermal shutdown; suited for non-critical, low-current USB ports | Select when FAULT monitoring is unnecessary and load current ≤500 mA |
| AP22653AW5-7 | 1200 mA rated current, 70 mΩ RON, active-low EN, no UVLO hysteresis | Better conduction efficiency but less robust under brown-out; requires external UVLO supervision | Prefer for high-efficiency 12 V-to-5 V distribution where input regulation is tightly controlled |
Compared with TPS2051BDR and AP22653AW5-7, STMPS2171STR uniquely combines 1000 mA capability, active-high EN, integrated FAULT signaling, and certified UVLO/thermal protection - making it optimal for safety-aware, hot-swap-capable industrial and medical power rails.
Availability
STMPS2171STR is available at Aetrix Electronics and suitable for USB peripheral power management, industrial I/O modules, medical sensor nodes, and automotive body control applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for STMPS2171STR 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 specializing in power management, microcontrollers, and analog ICs - headquartered in Geneva, Switzerland, with manufacturing and R&D across Europe, Asia, and the Americas.
The STMPS series targets robust power distribution in harsh environments - designed specifically for applications encountering heavy capacitive loads, short circuits, and thermal stress, such as industrial automation and medical instrumentation.
FAQ
What is the maximum allowable ambient temperature for continuous 1000 mA operation in SO-8 package?
The SO-8 package has a thermal resistance θJA of 160 °C/W. With 140 mΩ RON and 1 A load, power dissipation is 140 mW, resulting in a 22.4 °C junction-to-ambient rise. At maximum junction temperature of 125 °C, maximum ambient temperature is 102.6 °C - confirmed in Table 6 of the datasheet.
Does STMPS2171STR support reverse current flow when the switch is ON?
No. When enabled (EN = high), the device does not block reverse current - if VOUT > VIN, reverse current flows through the body diode of the internal N-MOSFET. Reverse blocking is only guaranteed when EN = low or VIN = 0 V, per Section 3.4 of the datasheet.
How does the 10 ms fault blanking interact with thermal shutdown?
Fault blanking applies only to overcurrent events. Thermal shutdown triggers immediately upon junction temperature exceeding 135 °C, with no blanking delay. The FAULT pin asserts low within microseconds of thermal trip, independent of the 10 ms timer used for current-limit faults.
Can STMPS2171STR be used with 3.3 V logic-level microcontrollers without level shifting?
Yes. The EN input is CMOS/TTL compatible with VIH(min) = 2.0 V and VIL(max) = 0.8 V at VIN = 3.3 V, fully supporting direct connection to 3.3 V GPIOs. No external level shifter is required for enable control.
STMPS2171STR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- SC-74A, SOT-753
- 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):
- 90mOhm
- 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:
- SOT-23-5
STMPS2171STR FAQ
1.How can I place an order for STMPS2171STR through Aetrix?
Please submit a Request for Quotation (RFQ) for STMPS2171STR 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 STMPS2171STR reliable?
The price and inventory of STMPS2171STR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STMPS2171STR is usually 5 days.
3.What payment methods are accepted for STMPS2171STR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STMPS2171STR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STMPS2171STR?
STMPS2171STR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STMPS2171STR 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 STMPS2171STR?
For technical support, including STMPS2171STR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STMPS2171STR requirements.
6.How does Aetrix verify that STMPS2171STR is sourced from the original manufacturer or authorized distributors?
All STMPS2171STR 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 STMPS2171STR meets industry standards.
7.What is the process for return or replacement of STMPS2171STR?
All STMPS2171STR units undergo pre-shipment inspection (PSI). If there is an issue with STMPS2171STR, 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 STMPS2171STR part is unused and in its original packaging.
Return procedure for STMPS2171STR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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