Question 1

What is an SMD marking code and how to decode it?

Accepted Answer

SMD marking codes are 1-4 character identifiers laser-etched onto miniature components like SOT-23, SOD-123, and DFN packages. SMDCatalog translates these codes into full manufacturer part numbers, pinouts, internal schematics, and multimeter test values.

Question 2

How do you test a SOT-23 SMD transistor with a digital multimeter?

Accepted Answer

Set your multimeter to Diode Mode. Place the red probe on the Base and black on Emitter/Collector for NPN transistors (expect 0.55V - 0.70V forward voltage drop). In reverse polarity, the meter must read 'OL' (open loop). SMDCatalog provides exact pinout probe step diagrams for each code.

Question 3

How to identify power management IC pinout and voltages?

Accepted Answer

SMDCatalog Integrated Circuits Lab provides pin 1 orientation, color-coded functional pinouts (VCC, GND, SW, FB), live expected DC voltages under power, and diode mode resistance readings for 69 popular ICs including TP4056, CH340G, and AMS1117.

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