1500W bidirectional TVS in a DO-201 axial package
The 1.5KE20CA A0G: It clamps transients at 27.7V maximum and handles 56A peak pulse current, making it a solid choice for general-purpose overvoltage protection on DC rails or signal lines where you need a single device to handle both polarities. The reverse standoff voltage is 17.1V, so it sits across a 12V or 15V rail without conducting in normal operation, and breakdown is guaranteed between 19V and the clamping ceiling. Bidirectional means one part covers positive and negative transients — handy when the line polarity isn't fixed or you want to simplify the BOM.
What the ratings mean for your protection design
For shorter pulses (like 8/20µs) the peak power capability is higher, but the datasheet's 10/1000µs rating is the conservative number to use for BOM margin. The DO-201 axial package (also known as DO-27) is through-hole — easy to hand-solder or wave-solder, and the leads are thick enough to handle the pulse current without fusing. Note that power line protection is listed as 'No' — this TVS is intended for secondary-side or signal-line clamping, not for direct mains surge suppression. For AC mains you would look at a higher-energy MOV or a dedicated power TVS rated for repetitive surges.
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