NXP Semiconductors Product data sheet PNP general purpose transistors BC556; BC557 PACKAGE OUTLINEPlastic single-ended leaded (through hole) package; 3 leadsSOT54 c E d A L b 1 e1 2 D e 3 b1 L1 0 2.5 5 mm scale DIMENSIONS (mm are the original dimensions)L (1)UNITAbbcDdEeeL111max. 5.2 0.48 0.66 0.45 4.8 1.7 4.2 14.5 mm 2.54 1.27 2.5 5.0 0.40 0.55 0.38 4.4 1.4 3.6 12.7 Note 1. Terminal dimensions within this zone are uncontrolled to allow for flow of plastic and terminal irregularities. REFERENCESOUTLINEEUROPEANISSUE DATEVERSIONPROJECTIONIECJEDECJEITA 04-06-28 SOT54 TO-92 SC-43A 04-11-16 2004 Oct 11 6 Document Outline Features Applications Description Pinning Ordering information Limiting values Thermal characteristics Characteristics Package outline Data sheet status Disclaimers