The STR-F6267 is an integrated circuit (IC) manufactured by Sanken Electric Co. It is primarily used as an off-line switching regulator in power supply circuits for consumer electronics like televisions and AC adapters. 📋 Technical Overview

The STR-F6267 is a 5-pin SIP (Single In-line Package) module that combines several critical components into one chip to simplify power supply design: Power MOSFET: Handles high-voltage switching.

Current Mode PWM Controller: Regulates output power precisely.

Built-in Protection: Includes thermal shutdown, overcurrent protection, and soft-start functionality to prevent damage during power-up.

Efficiency: Capable of reaching up to 95% efficiency, which reduces heat and saves energy. ⭐ Expert Review & Performance

This IC is widely regarded as a "workhorse" component for mid-range power applications.

Reliability: It is known for its robust protection suite. The thermal shutdown is particularly effective at preventing the IC from burning out during heavy loads or poor ventilation.

Ease of Use: Because it integrates the MOSFET and PWM controller, it significantly reduces the number of external components needed on a PCB, lowering production costs.

Quiet Operation: Features a built-in frequency jittering circuit that helps reduce electromagnetic interference (EMI) noise, making it easier for products to pass regulatory standards.

Availability: While common in older hardware, it is often treated as an "obsolete" or "hard-to-find" part by modern distributors, though it is still widely available from specialty suppliers like Jotrin Electronics or Veswin. ⚠️ Common Use Cases

Televisions: Often found in the primary stage of CRT or early LCD power boards. Adapters: Used in high-wattage AC/DC power bricks.

Industrial: Found in some small-scale motor drivers and battery chargers.

💡 Key Takeaway: If you are repairing an older device or designing a simple, cost-effective power supply, the STR-F6267 is a solid choice due to its high efficiency and minimal external component requirements. STR-F6267 | In Stock | Utsource

Key Features (Extracted from the STR F6267 datasheet PDF):

• Built-in MOSFET: 650V / 8A power MOSFET.
• Operating Frequency: 67 kHz typical (fixed).
• Protection Functions:
  • Overcurrent protection (OCP) with pulse-by-pulse limitation.
  • Overload protection (OLP) – auto-restart or latch mode.
  • Overvoltage protection (OVP) on VCC pin.
  • Thermal shutdown (TSD).
• Startup Circuit: Low power consumption (under 0.1W in standby).
• Soft-start function (6 ms typical).

These features make it ideal for power supplies ranging from 40W to 100W (with adequate heat sinking).

Why the STR F6267 is a Popular Choice

The STR-F6267 integrates a power MOSFET and a control IC into a single 5-pin package (TO-220F-5). This integration reduces external component count, simplifies PCB layout, and enhances reliability. Common applications include:

• LCD/PDP TV power supplies
• DVD players and set-top boxes
• Battery chargers
• Auxiliary power supplies for industrial equipment
• Standby power converters

Its key advantages include:

• Built-in Avalanche rugged MOSFET (650V)
• Current-mode PWM control with frequency hopping for reduced EMI
• Automatic burst mode under light loads to save energy
• Multiple protection features: Overcurrent (OCP), Overvoltage (OVP), Thermal shutdown (TSD)

Overview

The STR-F6267 is a specialized hybrid Integrated Circuit (IC) designed by Sanken Electric (now part of Onsemi) for use in Switched-Mode Power Supplies (SMPS). It belongs to the STR-F6200 series, which is widely respected in the consumer electronics industry for high reliability and simplified circuit design.

This component is primarily found in LED televisions, CRT monitors, and industrial power supply units. It functions as a high-voltage power switch and controller, integrating a power MOSFET and a control IC into a single package.

Informative Report: STR-F6267 Off-Line Switching Regulator

Datasheet PDF Availability

Finding the exact "STR-F6267" datasheet can sometimes be difficult because Sanken often groups components under series datasheets.

How to find the PDF:

1. Search Queries: Try searching specifically for:
   • "STR-F6267 datasheet pdf"
   • "Sanken STR-F6200 series datasheet" (The F6267 is often detailed within the family datasheet).
   • "STR-F6267 replacement equivalent" (to cross-reference with popular datasheet repositories).
2. Repositories: Reliable sources include:
   • Alldatasheet.com
   • Datasheets360
   • Onsemi.com (The official manufacturer successor).
3. Substitution Notes: If you cannot find the F6267 specifically, look for the STR-F6267S or other members of the STR-F6200 series (like STR-F6656), but verify pin-for-pin compatibility as voltage/current ratings differ.

3. Comprehensive Protection Suite

The STF6267 is "bulletproof" against harsh automotive environments, featuring:

• Undervoltage Lockout: Prevents erratic behavior during battery voltage dips (cranking).
• Overtemperature Shutdown: Thermal sensor shuts down the device if the junction temperature exceeds safe limits, with automatic restart upon cooling.
• Short-Circuit Protection: Limits current during fault conditions to protect the device and the wiring harness.
• Reverse Battery Protection: Withstands reverse polarity connection (requires external resistor/circuitry depending on configuration).
• Load Dump Protection: Designed to survive voltage transients caused by battery disconnection while the alternator is running.
• ESD Protection: High immunity to Electrostatic Discharge (Human Body Model and Machine Model).

7. Protection Modes Explained

| Protection | Trigger Condition | Action | | :--- | :--- | :--- | | Overcurrent (OCP) | ( V_S/OCP ) > 0.72V per cycle | Pulse-by-pulse duty cycle reduction. | | Overload (OLP) | FB pin voltage > threshold for >50ms | Latch-off (requires VCC power cycle to reset). | | Overvoltage (OVP) | ( V_CC ) > 24V (due to aux winding failure) | Latch-off. | | Thermal Shutdown (TSD) | Junction temp > 140°C | Soft shutdown; auto-recovery when temp drops 50°C hysteresis. |