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Please help me to identify the SMD marked as 20 3C, which is used in a cable TV set top box tuner section for amplifying the RF input. It's operating on 5V DC. Please inform me of the package code, and the component value. It resembles the SOT89 dimensions.

  • \$\begingroup\$ 0 down vote If it is SOT-89 Maybe a voltage regulator, MC78LC33HT1 or RH5RL33AA (3.3V). What is the designation letter? (the complete thing under R167). \$\endgroup\$
    – Antonio
    Jul 7, 2016 at 13:45
  • \$\begingroup\$ @Antonio I take it all back completely. This older version datasheet confirms that the MC78LC33HT1 does have the marking 3C along with a 2 digit year code, but not arranged in a square. \$\endgroup\$ Jul 7, 2016 at 13:55
  • \$\begingroup\$ @TomCarpenter, also this new. But marking suggest me that is more likely your XC6203E432PR. \$\endgroup\$
    – Antonio
    Jul 7, 2016 at 14:03
  • \$\begingroup\$ @Antonio that new one indicates there are 5 letters and a dot in one of two places, which doesn't match. \$\endgroup\$ Jul 7, 2016 at 14:04
  • \$\begingroup\$ Never mind, not the XC6203E432PR, the markings don't work out (it would mean a 1-3V regulator that is 4.3V). \$\endgroup\$ Jul 7, 2016 at 14:12

1 Answer 1


If it is SOT-89 maybe a MC78LC33HT1 3.3V voltage regulator (or RH5RL33AA).
You can see the marking code in this old datasheet, page 11.

  • \$\begingroup\$ when i searched in web i found the component which is femilier with my circuit please check the attachment give your suggestion, because it is used in RF section of set top box.[enter link description here][1] [1]: triquint.com/products/d/DOC-A-00000398 \$\endgroup\$ Jul 10, 2016 at 5:14
  • \$\begingroup\$ I don't think that it's your component, but if you tell us the letter before "195", in your picture this could help to identify. \$\endgroup\$
    – Antonio
    Jul 12, 2016 at 6:55
  • \$\begingroup\$ it is marked as R195 \$\endgroup\$ Jul 13, 2016 at 13:08

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