Description
The STK73903 is an original, vintage Sanyo thick-film hybrid integrated circuit (IC) that operates as a self-excitation type feedback control off-line switching regulator module. By incorporating high-efficiency Power MOSFET elements rather than traditional bipolar transistors, it supports a higher oscillator frequency (up to 100kHz), which drastically reduces the physical footprint requirements for external pulse transformers and filter capacitors.
Key Features & Specifications:
- Function: Self-Excitation Type Feedback Control Off-Line Switching Regulator
- Maximum Output Power: 180W
- Internal Topography: Combines power switching, driver circuits, error amplifiers, and overcurrent protection (OCP) circuits on a single sub-module
- Voltage Constraints: 500V Maximum Drain-Source Breakdown Voltage ($V_{(BR)DSS}$)
- Package Type: 11-Pin Single In-Line Package (SIP) featuring Sanyo's signature metal substrate backing plate for direct heatsink installation
- Applications: Primary power supply regulator module for legacy CRT/CTV analog color televisions and older office automation hardware
- Manufacturer: Sanyo Electric Co., Ltd. (Sanyo Semiconductor Division)
A pristine New-Old-Stock (NOS) semiconductor module. Essential for bench technicians and restoration specialists servicing vintage analog televisions, legacy power boards, and retro monitors.