TO-66

GD241 PNP transistor in a TO-66 package.

TO-66 is a type of semiconductor package for devices with three pins, such as transistors. The shape is similar to the TO-3 package, but the size is smaller. ^[1]

References

↑ TO-66 package details, Central Semiconductor Corp., 2008, retrieved 2013-12-09

Semiconductor packages

Diode	DO-204 DO-213 / MELF DO-214 / SMA / SMB / SMC SOD

Transistor	SOT / TSOT TO-3 TO-5 TO-18 TO-66 TO-92 TO-126 TO-220 TO-263 / D2PAK

Single row	SIP / SIL

Dual row	DFN DIP / DIL Flat Pack SO / SOIC SOP / SSOP TSOP / TSSOP ZIP

Quad row	LCC PLCC QFN QFP QUIP / QUIL

Grid array	BGA eWLB LGA PGA

Wafer	COB COF COG CSP Flip Chip PoP QP UICC WL-CSP / WLP

Related topics	Electronic packaging List of integrated circuit package dimensions Integrated circuit packaging List of integrated circuit packaging types

Note: It's relatively common to find packages that contain other components than their designated ones, such as voltage regulators in transistor packages, etc.