I am looking for an assistance to identify an electronic component used in wireless 2.4GHz wireless keyboard for Android TV box.

The component is in SOT-23 package and perhaps 3.3V voltage regulator with marking 'C33A' and emblem resembling "a boat with a sail" (or maybe pegasus with a wing).

Voltage 3.3V regulator

My investigation indicates that pin 1 is a ground, pin 2 is output and pin 3 input (connected to a battery through a coil).

I have looked through logos of electronic components manufacturers and did not find a match. Looking through voltage regulator components on a website of couple distributors, the electronic components have different pin layout.

  • \$\begingroup\$ You mentioned that it's "connected to a battery". A single 1.5V cell, or multiple in series? In other words: What's the input voltage? \$\endgroup\$ Commented Nov 16, 2023 at 19:54
  • \$\begingroup\$ I gather it's a 1.5 to 3.3V synchronous boost regulator, but more specificity would be welcome, yeah. I've seen three-terminal regulators like this before, but I forget who makes them or what part numbers are relevant. It's most likely a Chinese brand. \$\endgroup\$ Commented Nov 16, 2023 at 20:08
  • \$\begingroup\$ smd.yooneed.one/code4333.html has some devices with a SMD marking code of C33A, but looking at them can't seem to find a matching device. \$\endgroup\$ Commented Nov 16, 2023 at 20:44
  • \$\begingroup\$ @ Jonathan S. The keyboard utilizes 2 AAA batteries, so input voltage is about 3V. Spehro Pefhany was able to identify the item as QX2304L33T part made by QX Micro Devices (Shenzhen). \$\endgroup\$
    – Polar Bear
    Commented Nov 16, 2023 at 21:25

1 Answer 1


It's a QX Micro Devices (Shenzhen) QX2304L33T. Datasheet here

enter image description here

The trailing 'A' is the batch number.

From their website (no English datasheet):

Ø Maximum efficiency: 95%

Ø Maximum working frequency: 300 KHz

Ø Low quiescent current: 15uA

Ø Optional output voltage: 2.5V ~ 3.6V

Ø Output accuracy: ± 2.5%

Ø Wide input voltage range: 0.9V ~ 3.6V

Ø Low ripple and low noise

  • \$\begingroup\$ Thank you for the assistance, it looks like this is exactly what I was looking for. Although pin 2 marked as 'LX' (a little confusion) instead of 'VIN' otherwise pins match. Time to hunt where to purchace from. How did you identified electonic part -- what resources did you use? \$\endgroup\$
    – Polar Bear
    Commented Nov 16, 2023 at 21:21
  • \$\begingroup\$ A three-terminal boost converter? That's certainly unusual. \$\endgroup\$
    – Hearth
    Commented Nov 17, 2023 at 2:36
  • 1
    \$\begingroup\$ @Hearth It's not the only one, though, see for example ti.com/product/TPS61322 . That one looks like it's pin compatible and it has an english data sheet. \$\endgroup\$
    – wrtlprnft
    Commented Nov 17, 2023 at 8:53

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