The STR-F6267 is a current-mode PWM (Pulse Width Modulation) power IC with a built-in power MOSFET. Unlike discrete controller+FET designs, this "offline switching regulator" combines the control logic, start-up circuit, and a 650V/5A MOSFET into a single 5-pin package (TO-220F-5L).
Key features you need to check in the datasheet:
When you locate the updated PDF, focus on these three sections:
Before you wire this into your PCB, confirm these five pins against the updated datasheet:
Updated Note: Many "STR-F6267" failures are actually due to a faulty startup resistor (Rstart) or a dried-out VCC capacitor on Pin 3. The latest datasheet adds a note to use Low ESR capacitors here.
Q1: Is STR F6267 obsolete? A: While not in active high-volume production, it is classified as "NRND" (Not Recommended for New Designs) by Sanken. However, updated datasheets are maintained for repair and legacy manufacturing. The “updated” status refers to revisions clarifying thermal data and OCP thresholds.
Q2: Can I replace STR F6267 with STR F6268? A: No. The F6268 has a higher Rds(on) and lower current rating (6A vs 8A). Using it in a 150W design designed for the F6267 will cause overheating and premature failure. Always verify the suffix.
Q3: Does the updated PDF include PCB layout guidelines? A: Yes. The latest revision adds a dedicated section on Kelvin connection for the Source pin to prevent false OCP triggering due to common impedance coupling.
Q4: What is the expected switching frequency? A: The frequency varies with load and line voltage, ranging from 20kHz (heavy load) to 120kHz (light load). At no load, it drops to burst mode (~500Hz bursts).
Overload Protection (OLP)
Overvoltage Protection (OVP)
Thermal Shutdown (TSD)
The STR-F6267 is a current-mode PWM (Pulse Width Modulation) power IC with a built-in power MOSFET. Unlike discrete controller+FET designs, this "offline switching regulator" combines the control logic, start-up circuit, and a 650V/5A MOSFET into a single 5-pin package (TO-220F-5L).
Key features you need to check in the datasheet:
When you locate the updated PDF, focus on these three sections:
Before you wire this into your PCB, confirm these five pins against the updated datasheet:
Updated Note: Many "STR-F6267" failures are actually due to a faulty startup resistor (Rstart) or a dried-out VCC capacitor on Pin 3. The latest datasheet adds a note to use Low ESR capacitors here.
Q1: Is STR F6267 obsolete? A: While not in active high-volume production, it is classified as "NRND" (Not Recommended for New Designs) by Sanken. However, updated datasheets are maintained for repair and legacy manufacturing. The “updated” status refers to revisions clarifying thermal data and OCP thresholds.
Q2: Can I replace STR F6267 with STR F6268? A: No. The F6268 has a higher Rds(on) and lower current rating (6A vs 8A). Using it in a 150W design designed for the F6267 will cause overheating and premature failure. Always verify the suffix.
Q3: Does the updated PDF include PCB layout guidelines? A: Yes. The latest revision adds a dedicated section on Kelvin connection for the Source pin to prevent false OCP triggering due to common impedance coupling.
Q4: What is the expected switching frequency? A: The frequency varies with load and line voltage, ranging from 20kHz (heavy load) to 120kHz (light load). At no load, it drops to burst mode (~500Hz bursts).
Overload Protection (OLP)
Overvoltage Protection (OVP)
Thermal Shutdown (TSD)