Product Overview
Three-Terminal 100 kHz Flyback Power Switch for SMPS Repair
Condition
New old stock in clean, unused condition with straight through-hole leads and an unmounted metal tab. Markings legible: TOP202YAI. Sold each.
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Product Overview
Power Integrations TOP202YAI combines a 700V power MOSFET, PWM controller, and protection circuitry on a single chip. Housed in a through-hole TO-220-3 package, it operates at a fixed 100 kHz switching frequency for off-line flyback power supplies and converter circuits. It serves as a direct replacement component for servicing legacy switched-mode power supplies, industrial controls, and bench power designs.
Key Features
- 700V integrated power MOSFET breakdown rating
- Fixed 100 kHz PWM switching frequency
- Universal AC input capability from 85 VAC to 265 VAC (15W to 30W output power)
- Through-hole TO-220-3 package with metal mounting tab
- Built-in thermal shutdown and auto-restart protection
- Three-terminal configuration: Drain, Source, and Control
Applications
- Servicing legacy CRT monitors, audio gear, and industrial power supply boards
- Rebuilding auxiliary power supplies in industrial motor drives and automation cabinets
- Prototyping custom isolated low-power AC-to-DC converters on bench repair projects
- Replacing failed primary-side switcher ICs in commercial telecom and network equipment
Frequently Asked Questions
What is the pinout configuration for the TO-220-3 package?
The three terminals correspond to Pin 1 for Drain, Pin 2 for Source (connected to the mounting tab), and Pin 3 for Control.
Does this switcher require an external startup bias winding?
The internal high-voltage current source charges the control capacitor directly from the drain pin at startup, eliminating the need for external startup resistors.
Can the TOP202YAI directly substitute for other TOP200 series parts?
The TOP202YAI shares the 100 kHz frequency and TO-220-3 pinout with other members of the first-generation TOPSwitch family, but has specific internal MOSFET on-resistance and power limits. It directly replaces TOP202Y and TOP202YAI designations in circuits sized up to 30W on universal AC input.
When an older flyback supply goes dark, it is usually this three-legged workhorse that took the hit. Drop in an unused original and get the rails humming again.
