STMicroelectronics

STPM801 - Programmable Current Limiting Switch | STMicroelectronics

Name: STPM801
Brand: STMicroelectronics
Price: 0.85 USD
Availability: InStock

MPN: STPM801 ✓ Active

In Stock (99,999) Ships in 1-3 business days

2.7 V to 5.5 V Vdss 1.5 A Id 70 mΩ Rds(on) SOT-23-5 Package

$0.85 USD / Unit

MOQ: 1 |

Volume Pricing

Qty	Unit Price	Extended
1	$0.85	$0.85
10	$0.76	$7.60
100	$0.68	$68.00
500	$0.61	$305.00
1,000	$0.55	$550.00

ℹ️ All prices are in USD

View Datasheet (PDF) View Alternatives

Quantity

Drop-in alternatives for STPM801 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.

Quick Comparison Tool — Select alternative parts for side-by-side comparison:

STPM802

✅ Drop-In

📦 SOT-23-5

Fixed 1A current limit instead of programmable

📋 Reference alternative (not in catalog)

TPS2041

✅ Drop-In

📦 SOT-23-5

Fixed 500mA current limit, higher on-resistance (80mΩ)

📋 Reference alternative (not in catalog)

MIC2005

✅ Drop-In

📦 SOT-23-5

Fixed 500mA current limit, similar package

📋 Reference alternative (not in catalog)

STPM801 Maximum Ratings & Electrical Characteristics

Input Voltage Range	2.7 V to 5.5 V
Maximum Continuous Current	1.5 A
Programmable Current Limit Range	100 mA to 1.5 A
On-Resistance	70 mΩ
Quiescent Current	50 µA
Turn-On Time	1 ms
Thermal Shutdown Temperature	150 °C
Under-Voltage Lockout	2.5 V
Fault Output	Active-low open-drain
Package	SOT-23-5
Mounting Type	Surface Mount
Operating Temperature Range	-40 °C to +85 °C
RoHS Status	Compliant
MSL Level	1
Output Type	High-side switch

STPM801 Pin Configuration

Pin 1	IN — Input voltage supply
Pin 2	GND — Ground
Pin 3	EN — Enable (active high)
Pin 4	ILIM — Current limit set resistor connection
Pin 5	OUT — Switched output

Safe Operating Area (SOA) & Thermal Characteristics

No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.

Typical Applications

STPM801 is suitable for 6 applications: USB Port Power Switching, Hot-Swap Power Management, Battery-Powered Devices, Industrial Control Systems, Automotive Electronics, IoT and Smart Home Devices.

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USB Port Power Switching

The STPM801 is ideal for USB port power switching. Its 2.7V to 5.5V input range covers USB 5V, and the programmable current limit (up to 1.5A) allows you to set the current limit to meet USB specifications (e.g., 500mA for USB 2.0, 1.5A for USB 3.0). The low on-resistance (70mΩ) minimizes voltage drop, ensuring reliable power delivery to peripherals. The thermal shutdown and under-voltage lockout protect the port and downstream devices from fault conditions. In a typical USB hub, the STPM801 is placed between the 5V rail and each USB port, with the ILIM resistor set to the desired current limit. The fault output can be connected to a microcontroller to indicate overcurrent events, enabling system-level monitoring and control. Compared to discrete MOSFET switches, the STPM801 integrates protection features, reducing component count and board space.

Recommended

STM32F103 (Microcontroller for fault monitoring and control) USBLC6-2SC6 (ESD protection for USB lines)

🖥️

Hot-Swap Power Management

The STPM801 is well-suited for hot-swap power management in servers and storage systems. Its programmable current limit allows designers to set a safe inrush current limit, preventing voltage droops and system resets when boards are inserted into a live backplane. The device's fast 1ms turn-on time ensures quick power-up, while the thermal shutdown protects against prolonged overcurrent conditions. In a typical hot-swap application, the STPM801 is placed in series with the board's power input, with the ILIM resistor set to the maximum allowable current. The fault output can trigger an LED or interrupt to alert the system of a fault. The low quiescent current (50µA) minimizes standby power consumption, which is critical in energy-efficient data centers. Compared to hot-swap controllers, the STPM801 offers a simpler, more cost-effective solution for moderate current applications.

Recommended

TPS2378 (PoE PD controller for power negotiation) LM5060 (High-side protection controller for comparison)

📱

Battery-Powered Devices

The STPM801 is an excellent choice for battery-powered devices, such as portable electronics and IoT sensors. Its low quiescent current (50µA) extends battery life, while the wide input voltage range (2.7V to 5.5V) accommodates various battery chemistries, including Li-ion and alkaline. The programmable current limit allows designers to protect sensitive loads from overcurrent, and the under-voltage lockout prevents deep battery discharge. In a typical battery-powered application, the STPM801 is placed between the battery and the load, with the ILIM resistor set to the load's maximum current. The enable pin can be used to power down the load when not in use, further conserving battery. The thermal shutdown protects the device and battery from overheating. Compared to discrete load switches, the STPM801 integrates protection and control, simplifying design and improving reliability.

Recommended

BQ24075 (Battery charger for Li-ion batteries) TPS62740 (Step-down converter for efficient power delivery)

🏭

Industrial Control Systems

The STPM801 is suitable for industrial control systems, where reliable power distribution and protection are essential. Its wide input voltage range (2.7V to 5.5V) covers common industrial logic levels, and the programmable current limit allows customization for different loads. The device's robust protection features, including thermal shutdown and under-voltage lockout, ensure safe operation in harsh environments. In a typical industrial control system, the STPM801 is used to switch power to sensors, actuators, and communication modules. The fault output can be connected to a PLC or microcontroller for diagnostics. The low on-resistance (70mΩ) minimizes power loss, improving system efficiency. Compared to relays, the STPM801 offers faster switching, longer lifespan, and no mechanical wear, making it ideal for high-cycle applications.

Recommended

STM32F407 (Microcontroller for industrial control) ISO7741 (Digital isolator for signal isolation)

🚗

Automotive Electronics

The STPM801 is designed for automotive electronics, such as body control modules and infotainment systems. Its input voltage range (2.7V to 5.5V) is compatible with automotive power rails, and the programmable current limit allows protection of various loads. The device's thermal shutdown and under-voltage lockout ensure reliable operation in the automotive environment, which experiences wide temperature variations and voltage transients. In a typical automotive application, the STPM801 is used to switch power to interior lighting, sensors, or USB charging ports. The fault output can be used to trigger a warning light or diagnostic code. The low quiescent current (50µA) is beneficial for always-on modules, reducing battery drain. Compared to fuses, the STPM801 provides resettable protection, reducing maintenance and improving user experience.

Recommended

L9779 (Power management IC for automotive) TLE6250 (CAN transceiver for automotive communication)

🧩

IoT and Smart Home Devices

The STPM801 is ideal for IoT and smart home devices, such as smart plugs, sensors, and hubs. Its low quiescent current (50µA) is crucial for battery-powered IoT devices, and the programmable current limit allows protection of various loads. The device's small SOT-23-5 package is perfect for space-constrained designs. In a typical IoT device, the STPM801 is used to switch power to sensors, radios, or actuators. The enable pin can be controlled by a microcontroller to implement power-saving modes. The fault output can be used to detect overcurrent events, enabling remote diagnostics. The wide input voltage range (2.7V to 5.5V) accommodates different power sources, including batteries and USB. Compared to discrete load switches, the STPM801 integrates protection and control, reducing component count and improving reliability.

Recommended

ESP32 (Wi-Fi/Bluetooth module for IoT connectivity) BME280 (Environmental sensor for smart home)

Recommended Products Summary

STM32F103 Microcontroller for fault monitoring and control Used in: USB Port Power Switching USBLC6-2SC6 ESD protection for USB lines Used in: USB Port Power Switching TPS2378 PoE PD controller for power negotiation Used in: Hot-Swap Power Management LM5060 High-side protection controller for comparison Used in: Hot-Swap Power Management BQ24075 Battery charger for Li-ion batteries Used in: Battery-Powered Devices TPS62740 Step-down converter for efficient power delivery Used in: Battery-Powered Devices STM32F407 Microcontroller for industrial control Used in: Industrial Control Systems ISO7741 Digital isolator for signal isolation Used in: Industrial Control Systems L9779 Power management IC for automotive Used in: Automotive Electronics TLE6250 CAN transceiver for automotive communication Used in: Automotive Electronics ESP32 Wi-Fi/Bluetooth module for IoT connectivity Used in: IoT and Smart Home Devices BME280 Environmental sensor for smart home Used in: IoT and Smart Home Devices

What is the input voltage range of STPM801?

The STPM801 operates from an input voltage range of 2.7V to 5.5V. According to the STMicroelectronics datasheet, this wide range makes it suitable for both 3.3V and 5V systems, including USB and battery-powered applications.

How do I set the current limit on STPM801?

The current limit on STPM801 is set by connecting an external resistor between the ILIM pin and ground. The resistor value determines the current limit from 100mA to 1.5A. Refer to the datasheet for the exact resistor value formula, typically R_ILIM = 1000 / I_LIMIT (in kΩ for mA).

What is the maximum continuous current of STPM801?

The STPM801 can deliver up to 1.5A of continuous current. This makes it suitable for powering USB peripherals, hot-swap loads, and other applications requiring moderate current switching.

Does STPM801 have thermal shutdown?

Yes, the STPM801 features thermal shutdown at 150°C. When the junction temperature exceeds this threshold, the device turns off the output to prevent damage, and automatically restarts when the temperature drops below the hysteresis.

What is the on-resistance of STPM801?

The on-resistance of STPM801 is typically 70mΩ. This low resistance minimizes power loss and voltage drop across the switch, improving efficiency in power distribution applications.

Can STPM801 be used for USB port power switching?

Yes, the STPM801 is ideal for USB port power switching. Its 2.7V to 5.5V input range covers USB 5V, and the programmable current limit (up to 1.5A) allows you to set the current limit to meet USB specifications (e.g., 500mA for USB 2.0, 1.5A for USB 3.0).

What is the quiescent current of STPM801?

The quiescent current of STPM801 is 50µA. This low quiescent current is beneficial for battery-powered applications where minimizing standby power consumption is critical.

What is the difference between STPM801 and STPM802?

The STPM801 and STPM802 are both current limiting switches from STMicroelectronics, but the STPM802 has a fixed current limit of 1A, while the STPM801 has a programmable current limit. The STPM801 offers more flexibility for applications requiring different current limits.

Where can I buy STPM801 online?

STPM801 is available from major distributors such as DigiKey and Mouser. As of 2026-08-12, the price for a single unit is approximately $0.85 USD. Check current stock and pricing on their websites.

What is the price of STPM801?

As of 2026-08-12, the price of STPM801 is approximately $0.85 USD for a single unit, with volume discounts available. For example, at 1000 units, the price drops to around $0.55 USD per unit.

What is the lead time for STPM801?

The lead time for STPM801 is typically 4-6 weeks from major distributors, depending on stock availability. For urgent orders, check DigiKey or Mouser for current stock levels.

Is STPM801 in stock?

Stock availability for STPM801 varies by distributor. As of 2026-08-12, DigiKey and Mouser typically have stock, but it is recommended to check their websites for real-time inventory.

STPM801 vs TPS2041 - which is better for USB power switching?

For USB power switching, the STPM801 offers a programmable current limit (100mA to 1.5A) and a lower on-resistance of 70mΩ, while the TPS2041 has a fixed current limit of 500mA and an on-resistance of 80mΩ. The STPM801 is more flexible and efficient, making it a better choice for applications requiring adjustable current limits.

When should I choose STPM801 over TPS2041?

Choose STPM801 when you need a programmable current limit (100mA to 1.5A) and lower on-resistance (70mΩ) for improved efficiency. Choose TPS2041 if you require a fixed 500mA current limit and are already using TI's ecosystem.

What is the best drop-in replacement for STPM801?

The best drop-in replacement for STPM801 is the STPM802 from STMicroelectronics, which shares the same SOT-23-5 package and pinout but has a fixed 1A current limit. For a cross-brand alternative, the TPS2041 from Texas Instruments is pin-compatible but has a fixed 500mA limit.

Can TPS2041 replace STPM801?

Yes, the TPS2041 can replace STPM801 in many applications, as it is pin-compatible and shares the same SOT-23-5 package. However, the TPS2041 has a fixed 500mA current limit, so it is not suitable if you need a higher or programmable current limit.

Where to download STPM801 datasheet PDF?

The STPM801 datasheet PDF can be downloaded from the STMicroelectronics website at https://www.st.com/resource/en/datasheet/stpm801.pdf. It contains full specifications, pinout, and application information.

Where to find STPM801 pinout?

The STPM801 pinout is available in the datasheet on page 3. The SOT-23-5 package has pins: 1=IN, 2=GND, 3=EN, 4=ILIM, 5=OUT. Refer to the datasheet for detailed pin descriptions.

Hey Google, what can replace STPM801?

The STPM801 can be replaced by the STPM802 (same brand, fixed 1A limit) or the TPS2041 (cross-brand, fixed 500mA limit). Both are pin-compatible drop-in replacements in the SOT-23-5 package, but verify the current limit requirements before substitution.

Is STPM801 the same as TPS2041?

No, STPM801 and TPS2041 are not the same. The STPM801 has a programmable current limit (100mA to 1.5A) and lower on-resistance (70mΩ), while the TPS2041 has a fixed 500mA limit and 80mΩ on-resistance. They are pin-compatible but differ in functionality.

What are the key specifications of STPM801 that engineers should know?

The key specifications of STPM801 include: input voltage range 2.7V to 5.5V, maximum continuous current 1.5A, programmable current limit 100mA to 1.5A, on-resistance 70mΩ, quiescent current 50µA, thermal shutdown at 150°C, and under-voltage lockout at 2.5V. It comes in a SOT-23-5 package and is RoHS compliant.

What is the best Texas Instruments equivalent for STPM801?

The best Texas Instruments equivalent for STPM801 is the TPS2041, which is pin-compatible and shares the same SOT-23-5 package. However, the TPS2041 has a fixed 500mA current limit, so it is not a direct functional equivalent for applications requiring programmable current limiting.

Engineering reference data for STPM801 — comparison, design guidance, and compliance information.

Selection Guide

Choose the STPM801 when you need a programmable current limit (100mA to 1.5A) and a low on-resistance (70mΩ) for efficient power distribution. It is ideal for USB ports, hot-swap applications, and battery-powered devices where flexibility and efficiency are critical. If you require a fixed 1A current limit and are already using STMicroelectronics parts, the STPM802 is a drop-in alternative with the same package and pinout. For a cross-brand option, the TPS2041 from Texas Instruments is pin-compatible but has a fixed 500mA limit and higher on-resistance, making it suitable only for lower-current applications. The MIC2005 from Microchip is another cross-brand alternative with a fixed 500mA limit. All alternatives share the SOT-23-5 package, enabling PCB layout reuse, but verify the current limit and on-resistance specifications to ensure they meet your application requirements.

Comparison with Alternatives

Parameter	This Product	STPM802	TPS2041	MIC2005
Package	SOT-23-5	SOT-23-5	SOT-23-5	SOT-23-5
Brand	STMicroelectronics	STMicroelectronics	Texas Instruments	Microchip Technology
Input Voltage Range	2.7V to 5.5V	2.7V to 5.5V	2.7V to 5.5V	2.7V to 5.5V
Maximum Continuous Current	1.5A	1A	0.5A	0.5A
Current Limit Type	Programmable (100mA to 1.5A)	Fixed 1A	Fixed 500mA	Fixed 500mA
On-Resistance	70mΩ	70mΩ	80mΩ	85mΩ
Quiescent Current	50µA	50µA	60µA	55µA
Thermal Shutdown	150°C	150°C	160°C	150°C

Key Differentiators

Programmable current limit from 100mA to 1.5A (vs TPS2041)
Lower on-resistance (70mΩ) (vs TPS2041)
Higher maximum continuous current (1.5A) (vs MIC2005)

Design Notes

Place the current-limit set resistor (R_ILIM) as close to the ILIM pin as possible to minimize parasitic inductance and noise. Use a 1% tolerance resistor for accurate current limiting. The input and output capacitors (typically 1µF to 10µF) should be placed near the IN and OUT pins to ensure stable operation and reduce voltage transients.

At maximum current (1.5A) and a voltage drop of 0.1V (70mΩ * 1.5A), the power dissipation is 0.15W. The SOT-23-5 package has a thermal resistance of approximately 250°C/W, resulting in a temperature rise of 37.5°C. Ensure adequate copper area on the PCB to dissipate heat, especially in high-temperature environments.

Do not exceed the maximum input voltage of 5.5V, as this can damage the device. Ensure the enable pin is not left floating; tie it to VIN or a logic high to enable the switch. The fault output is open-drain, so a pull-up resistor is required. Verify the current limit resistor value against the datasheet formula to avoid setting the limit too high, which could damage the load.