SMD/Through-Hole Transistor Reference

This reference compares several transistor markings and their corresponding package styles.
SS8050 — NPN transistor, with the through-hole pin order E-C-B.
VCEO = 40 V, IC = 1.5 A, 300 mW
Y1 — SMD marking shown for an NPN transistor.
VCEO = 40 V, IC = 1.5 A, 300 mW
SS8550 — PNP transistor, with the through-hole pin order E-C-B.
VCEO = 40 V, IC = 1.5 A, 300 mW
Y2 — SMD marking shown for a PNP transistor.
VCEO = 40 V, IC = 1.5 A, 300 mW
A733 — PNP transistor, with the through-hole pin order E-C-B.
VCEO = 50 V, IC = 150 mA, 150 mW
ASY — PNP SMD transistor marking, with the pin arrangement shown as E-B-C-E.
VCEO = 50 V, IC = 150 mA, 150 mW
A quick reference like this can make transistor identification easier when working with unfamiliar markings and different package types.
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 SMD/Through-Hole Transistor Reference

 SMD/Through-Hole Transistor Reference