Help identify small IC chip

- Found in LED light assembly 
- DIP package with 5 gull wing leads in the 1,2,3,4 & 6 positions, as referenced below

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- Top says "TF98"
- Bottom says "S354"
- Small, about 1mm X 2mm

The shape of this IC, and the place where you found it, lead me to think it is an LED driver.

I have seen something in the same package (SOT23-5) called ZXSC310, by Zetex, which is now Diodes Inc(r).  Same shape, except that IC is labeled C310.

If there's a big inductor on the board right next to it, this tends to indicate the presence of an switchmode LED driver.

That's a tough one. Small surface mount parts like that don't often have room for the entire part number. They will sometimes use those markings to differentiate between different versions of part with different features like temp rating, etc. I don't know if there is a way to really cross reference it.

If there is any kind of identifiable company logo on it, you could narrow it down a bit and then search their site specifically .

It's hard to guess at what its function may be, as many types of devices come in those type of packages. It could be a voltage regulator, a transitor or dual transistors, or even a single gate logic IC.
Normally I would consider it an opto-isolator but in a light assembly i agree
with our powerful avatar probably a single logic gate.

What do you want to do with this ??