STR3A251D

AC DC Converters, Offline Switchers Overview

The STR3A251D is an off-line PWM controller manufactured by Sanken Electric USA Inc., featuring an integrated power MOSFET. It operates at a switching frequency of 67kHz with a maximum duty cycle of 75%. The device supports a breakdown voltage of 650V and accepts input voltages between 8.5V and 32V. Designed for through-hole mounting, it utilizes an 8-DIP package (0.300 inch / 7.62mm). The component functions within an operating temperature range of -40°C to 125°C (TA) and is suitable for flyback topology applications.

AC DC Converters, Offline Switchers Feature Summary

• Integrates a high-voltage power MOSFET with the PWM controller to reduce external component count.
• Operates at a fixed switching frequency of 67kHz for efficient power conversion.
• Supports wide input voltage ranges from 8.5V to 32V for versatile offline applications.

AC DC Converters, Offline Switchers Applications

• Off-line AC-DC converters
• Flyback topology power supplies
• Refrigerator main offline converters

AC DC Converters, Offline Switchers Procurement Notes

Verify the specific ordering suffix 'D' corresponds to the tube packaging configuration as documented in official Sanken datasheets. Confirm that the 8-DIP package dimensions match the required PCB footprint. Ensure the selected variant meets the -40°C to 125°C ambient temperature rating for the intended environment. Cross-reference the manufacturer part number with authorized distributors to avoid counterfeit components.

AC DC Converters, Offline Switchers Selection Notes

Select this component when a compact solution for low-to-medium power offline conversion is required. The integrated MOSFET simplifies design compared to discrete solutions. Verify that the 650V breakdown voltage aligns with the peak drain-source voltage requirements of the target circuit. Consider the 8-DIP package constraints if automated surface-mount assembly is planned, as this device requires through-hole technology.

AC DC Converters, Offline Switchers Part Context

This part belongs to Sanken's STR3A series of off-line PWM controllers with integrated power MOSFETs. These devices are engineered for cost-effective and reliable power supply designs. The series typically targets consumer electronics and appliance applications where space efficiency and reduced bill-of-materials are critical design drivers.

AC DC Converters, Offline Switchers Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Consult Sanken Electric technical support or authorized distributor catalogs for direct pin-compatible alternatives or functional equivalents within the STR3A family.