View umt3906 datasheet:

UMT3906 / SST3906 / MMST3906 / 2N3906 Transistors PNP General Purpose Transistor UMT3906 / SST3906 / MMST3906 / 2N3906 Features External dimensions (Units : mm) 1) BVCEO < -40V (IC=-1mA) 2.0±0.2 1.3±0.1 0.9±0.1 2) Complements the UMT3904 / SST3904 UMT3906 0.65 0.65 0.2 0.7±0.1 (1) (2) / MMST3904 / 2N3904. 0~0.1 (3) (1) Emitter 0.3+0.1 0.15±0.05 (2) Base -0 ROHM : UMT3 All terminals have same dimensions EIAJ : SC-70 (3) Collector Package, marking, and packaging specifications 2.9±0.2 Part No. UMT3906 SST3906 MMST3906 2N3906 0.95+0.2 -0.1 1.9±0.2 Packaging type UMT3 SST3 SMT3 TO-92 SST3906 0.45±0.1 0.95 0.95 Marking R2A R2A R2A - (1) (2) Code T106 T116 T146 T93 0~0.1 Basic ordering unit (pieces) 3000 3000 3000 3000 0.2Min. (3) (1) Emitter +0.1 (2) Ba