On Wed, 20 Feb 2013 15:10:43 -0800 (PST), John-Del
wrote:

It's an smd device with six legs, three on each side, about the size of an SOT23 transistor. Here's what it looks like:

http://www.icbank.com/icbank_data/se.../tsop6_dim.pdf

It's used in the primary side of a smps regulator on a power supply board. The board legend calls it an IC, but I've seen similar devices marked as transistors, and it looks like a transistor array. The markings on the device are KP 358, with an "I" in a box preceding the KP. If I Google just that number, Google returns datasheet sites, but they don't have any information about it.

I have another identical working supply, but the IC in the same location has 6M944a on the device. The boards are otherwise identical, so these two devices appear to be interchangeable. Neither Mouser or DigiKey seem to have anything on it.

If anyone knows what this is, what it subs to, or even a missing prefix or suffix to help identify this thing, I'd really appreciate it.

That COULD be a smps controller. While they are usually 8 pin
devices, 6 pin devices are often found.

It's been said many times, many ways; a single picture is worth a
thousand words.

PlainBill