Product Overview
Power Integrations TOP202YAI TOPSwitch Three-Terminal Off-Line PWM Switch, 700V 100kHz, TO-220 Package, Unused NOS
Condition
Unused NOS, sourced from an electronics distributor consolidating inventory. Visual inspection passed. Evaluation: Visual inspection only. Function testing not performed. TO-220 package markings H519, TOP202YAI, PB0400 are clean and legible. Three leads show light oxidation consistent with long-term storage; tab has minor surface marks. No cracks, chips, or bent leads.
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Product Overview
Power Integrations TOP202YAI is a three-terminal off-line PWM switcher IC from the TOPSwitch family. It integrates a 700V power MOSFET, PWM controller, and protection circuitry into a single TO-220 plastic package. Designed for AC-to-DC conversion in switched-mode power supplies, it reduces external component count compared to discrete designs and supports flyback, buck, boost, and forward converter topologies. Part status is listed as obsolete, making NOS stock the primary source for repair and legacy maintenance.
Key Features
- 700V breakdown voltage with integrated power MOSFET
- 100kHz switching frequency
- TO-220 three-terminal package - markings confirmed: H519, TOP202YAI, PB0400
- Supports flyback, buck, boost, and forward converter topologies
- Fault protection: cycle-by-cycle current limiting, over-temperature shutdown, auto-restart
- Operating junction temperature: -40°C to 150°C
- Reduces external component count vs. discrete MOSFET and controller designs
- Part status: obsolete - NOS stock for repair and legacy production
Applications
- Repair technician desolders a failed TOP202YAI from a consumer electronics or industrial power supply board and drops this NOS unit in to restore function without PCB redesign
- Industrial maintenance tech troubleshooting a downed control panel traces the fault to the power section, replaces the TOP202YAI, and brings the line back online
- Design engineer maintaining a legacy flyback converter design sources NOS stock to keep a production run alive while evaluating a redesign path
- Hobbyist or maker building an AC-DC switching supply from scratch uses the integrated MOSFET and controller to simplify the build and shrink the component count
- Electronics prototyper testing a compact off-line power supply for a 100/110/230V AC application integrates the TOP202YAI into a flyback topology breadboard
Frequently Asked Questions
Is the TOP202YAI pin-compatible with the TOP202YN or TOP200YN?
No. The TOP202YAI uses a TO-220 package. The TOP202YN and TOP200YN use a TO-220-3 package with a different physical footprint. These are not direct replacements for each other, and swapping them without a PCB redesign will result in hardware failure. Confirm your board's exact package requirement before ordering.
What external components does this IC require to build a complete power supply?
The TOP202YAI requires external components to function in a complete circuit: a transformer, rectifier diode, filter capacitors, a feedback network, and capacitors for compensation, bypass, and auto-restart functions. The IC integrates the MOSFET, PWM controller, and protection features, but the surrounding circuit must be designed for the specific topology and application.
Is the TOP202YAI RoHS compliant?
At least one distributor lists this part as RoHS non-compliant. Buyers with regulatory requirements should verify compliance status for their application before ordering.
What other parts are in the TOPSwitch family that are compatible with this design footprint?
The TOP202YAI is part of the TOP200-4/14 TOPSwitch family. Other TO-220 members include TOP200YAI, TOP201YAI, TOP203YAI, and TOP204YAI. Family members differ in output power range. Confirm the specific part number your design requires before substituting.
Does this come with a datasheet or documentation?
Not included. This is a component sale only.
Obsolete on the distributor lists, but still the exact shape the old board needs. If the power supply comes back on and the rest of the machine follows, this little TO-220 will have earned its keep quietly and completely.
