Submersible LED Light Puck

Not vintage, but LED light teardowns seem to be popular.  This one is a submersible LED light for use in your bath, hot tub, vase.  It is available on eBay for ridiculously low prices eg. $3.39 with free shipping

I had mine for over a year, and it worked quite well (though it was a bit of a battery hog.) However after a time the remote has stopped working.


So lets tear it down and take a look, here is the PCBThere is not much to it just the 10 LEDs, 3 transistors, a handful of resistors and capacitor, the IR receiver diode and an 8 pin driver chip on a metal board that acts as a heatsink.


This is a microscope stitched image of one of the LEDs, you can see 3 (R,G, & B) LEDs, 2 have two front surface bonds and one (I believe the blue LED) with just a single bond.

Driver Chip

The driver chip (It always seems to be an 8 pin chip) has absolutely no visible markings on it!

So of course lets decap this.  When I did I was quite surprised I expected to see a fairly simple analog die like the Bright Power Semiconductor LED driver I previously looked at. This is nothing like that!Submersible LED Driver die photo(As always click on image for high resolution version)

With as many as 6 levels of Cu metal, and likely made on a 90nm CMOS process it is very dense. Even the large driver transistors are not really visible. Its still a very small die just 1.5 mm x 0.5 mm (0.75 mm2), putting that in a die per wafer calculator, I get over 70,000 die on a 300mm wafer!

There is no company logo and the only die markings (Tritan Mar 2014  TT3015.) I suspect this could be a (Chinese) fabricated clone of someone else’s LED driver chip.

Searching for Tritan yielded no clues.  Here is a magnified image of a part of the logic showing multiple metal layers and the density, you really cannot see the lower layers

Remote Control

A simple construction is used for the receiver.  A front plastic layer that is glued to the front of the board with 32 button locations (24 are used.)  On the back just the battery connection, IR diode and a single chip encased with a glob top.

So I decapped the glob top chip and unfortunately had a DECAP FAILURE 🙂 It happens, though might be unusual to lose 3 corners and crack the die right down the middle. The die is the smallest one I have come across just 0.8 mm x 0.7 mm (0.56 mm2).

Again I was surprised by this die, I expected this to be more advanced node logic but is quite old technology probably 0.5 μm CMOS with just two metals

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One Response to Submersible LED Light Puck

  1. Brian Gray says:

    That’s fantastic. Keep me posted on future tear downs please.

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