STMicroelectronics STPW12PHR

Overview

STPW12PHR from STMicroelectronics is a programmable electronic power breaker in Power SO8 package, designed for real-time input power monitoring and over-power protection on 12 V bus systems. It features P-channel MOSFET with 50 mΩ typical R_DS(on), adjustable power limit (10–16 W), ±3% power limit accuracy at 25 °C, and integrated thermal shutdown (160 °C). Used in white goods and fan motor control to replace mechanical fuses and simplify UL certification.

For engineers reviewing the STPW12PHR datasheet, STPW12PHR pinout, STPW12PHR application, or STPW12PHR equivalent, key selection considerations include programmable auto-retry delay via C_SET, PWM-mode masking time set by R_DELAY, real-time monitor/fault pin signaling, and -40 °C to 125 °C junction temperature operation.

Technical Context

The STPW12PHR implements a closed-loop power-limiting architecture using internal current sensing and VIN measurement to compute instantaneous input power (P = V × I). Its charge-pump–driven P-channel switch enables low-loss conduction while supporting fast fault response (<30 µs settling) and configurable masking during PWM transitions.

Protection logic integrates three independent mechanisms: programmable power limit (set by R_SET), short-circuit current limit (instantaneous turn-off), and thermal shutdown (160 °C with hysteresis). The monitor/fault pin delivers dual-function analog voltage (0–3.2 V proportional to 0–15 W) and digital fault pulse (10 µs high pulse at threshold breach).

Key Specifications

Pinout & Package

STPW12PHR is housed in Power SO8 package with exposed thermal pad (GND-connected) for enhanced heat dissipation. Package dimensions comply with JEDEC MS-012AC, featuring 1.27 mm pitch, 4.9 mm × 6.0 mm body, and 1.25 mm height.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar electronic power breaker applications.

Compared with STPW12PHR, BTS724G offers higher current handling but no power monitoring or programmable timing, while NIS5132MN provides basic eFuse functionality at lower cost but sacrifices accuracy, thermal management, and design flexibility for appliance-grade reliability.

Availability

STPW12PHR is available at Aetrix Electronics and suitable for white goods, HVAC fan control, and industrial PLC I/O modules requiring stable component supply, long-term lifecycle support, and UL-compliant over-power protection.

Supply support for STPW12PHR 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 automotive ICs with strong industrial and appliance market focus.

The STPW12 product line delivers programmable electronic power breakers optimized for 12 V bus systems in white goods and industrial equipment, emphasizing safety certification simplification, real-time power telemetry, and robust thermal management.

FAQ

What is the function of the Monitor/Fault pin?

The Monitor/Fault pin serves dual roles: it outputs an analog voltage (0–3.2 V) linearly proportional to instantaneous input power (0–15 W), enabling real-time telemetry without external sensing; and it pulses high (4.5 V, 10 µs duration) when the power limit is exceeded, providing immediate digital fault indication to a microcontroller or supervisor IC.

How is the power limit threshold set and how accurate is it?

The power limit threshold is set by an external resistor (R_SET) between Pin 1 and GND; for example, 2.7 kΩ yields ~15 W at 12 V. Accuracy is ±3% at 25 °C, degrading to ±7.5% over 0–75 °C. Using a 0.1% tolerance resistor and minimizing PCB leakage ensures best-in-class repeatability for safety-critical applications.

Can STPW12PHR be used in PWM-controlled motor applications?

Yes - STPW12PHR supports direct PWM control via Pin 3, accepting up to 2 kHz signals with 20–100% duty cycle. Its programmable masking time (via R_DELAY) suppresses false power-limit triggers during PWM edges, making it suitable for BLDC fan drivers where inrush currents occur repeatedly during commutation.

What layout practices ensure reliable thermal performance?

Reliable thermal performance requires soldering the exposed thermal pad to a solid PCB ground plane, placing C_IN (≥10 µF) and C_OUT (≥10 µF) within 5 mm of respective pins, routing power traces wide and short, and adding a Schottky diode (e.g., STPS2L30) on VOUT to clamp negative inductive spikes - all per ST's DS12478 layout guidelines.