Description

STR6707 SANKEN ZIP-3 Transistor – High-Efficiency Switching Regulator IC

The STR6707 by SANKEN is a highly reliable switching regulator IC packaged in a ZIP-3 (TO-220-style) power package, designed for use in offline power supplies, SMPS circuits, and consumer electronics. This integrated power transistor combines a high-voltage power MOSFET with control circuitry in a single compact package, making it an efficient and space-saving solution for AC-to-DC power conversion applications.

Engineered by Sanken Electric, a globally respected semiconductor manufacturer, the STR6707 is known for its stable performance, high efficiency, and robust protection features, making it widely used in televisions, power adapters, set-top boxes, industrial power modules, and household electronic equipment.

Manufacturer overview:
https://www.sanken-ele.co.jp/en/

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Integrated Switching Regulator Design

The STR6707 integrates a high-voltage power transistor, PWM control circuitry, startup circuit, oscillator, and multiple protection functions into a single device. This level of integration reduces the need for external components, simplifying circuit design while improving overall system reliability.

By combining control and power elements in one IC, the STR6707 helps designers achieve compact layouts, lower BOM costs, and improved thermal performance compared to discrete transistor solutions.

Learn more about switching regulator ICs:
https://www.ti.com/power-management/switching-regulators/overview.html

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ZIP-3 Package for Efficient Heat Dissipation

The ZIP-3 package used by the STR6707 is designed for high power dissipation and mechanical stability. Its through-hole mounting allows secure installation on PCBs and efficient heat transfer when attached to a heatsink.

This package format makes the device well-suited for applications where thermal management and long-term reliability are critical, such as power supplies that operate continuously or under varying load conditions.

General information on power IC packaging:
https://www.electronics-notes.com/articles/electronic_components/semiconductors/ic-packages.php

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High Efficiency and Low Power Loss

The STR6707 is optimized for high conversion efficiency, reducing energy loss during switching operations. High efficiency not only improves overall system performance but also helps lower operating temperatures, extending the lifespan of surrounding components.

Its internal PWM control ensures stable output regulation across a wide range of input voltages and load conditions, making it suitable for global AC input designs.

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Built-In Protection Features

To ensure safe and reliable operation, the STR6707 includes multiple internal protection mechanisms, such as:

• Overcurrent protection

• Overvoltage protection

• Thermal shutdown

• Soft-start function

These features protect both the IC and the surrounding circuitry from abnormal operating conditions, helping prevent damage due to overloads, short circuits, or overheating.

Overview of SMPS protection functions:
https://www.eetimes.com/switching-power-supply-protection-features/

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Wide Range of Applications

Thanks to its robust design and integrated features, the STR6707 is commonly used in:

• Switch-mode power supplies (SMPS)

• LCD and LED televisions

• Power adapters and chargers

• Audio and video equipment

• Industrial control power modules

• Consumer electronics power boards

• Standby power supplies

Its proven reliability makes it a preferred choice for both original equipment manufacturers and repair professionals.

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Electrical Performance and Stability

The STR6707 delivers stable output regulation, low noise operation, and reliable startup performance. Its internal oscillator and feedback control allow precise voltage regulation, even under fluctuating input conditions.

This stability is particularly important in sensitive electronics where voltage variations can affect performance or cause system malfunctions.

Learn more about SMPS stability and regulation:
https://www.allaboutcircuits.com/technical-articles/switching-regulators-basics/

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Ease of Integration and Replacement

Designed as a complete power solution, the STR6707 simplifies PCB layout and reduces design complexity. Its standardized ZIP-3 pin configuration allows easy integration into existing designs and makes it a popular replacement part in power supply repairs.

For maintenance and servicing, the STR6707 is widely recognized and supported in the electronics repair community, particularly for TV and power board repairs.

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Key Product Specifications (Overview)

• Product type: Switching regulator IC with integrated power transistor

• Model: STR6707

• Manufacturer: SANKEN

• Package type: ZIP-3

• Application: Offline SMPS and power supply circuits

• Mounting: Through-hole

• Protection features: Overcurrent, overvoltage, thermal shutdown

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Why Choose the STR6707 SANKEN ZIP-3 Transistor?

The STR6707 offers a powerful combination of integration, efficiency, and reliability. Its all-in-one switching regulator design reduces component count, improves thermal management, and enhances system protection. Backed by Sanken’s reputation for quality and long-term performance, this device is an excellent choice for both new power supply designs and replacement applications.

Whether used in consumer electronics, industrial systems, or repair projects, the STR6707 delivers dependable power control you can trust.