View umt4401 datasheet:

UMT4401 / SST4401 / MMST4401 / 2N4401 Transistors NPN Medium Power Transistor (Switching) UMT4401 / SST4401 / MMST4401 / 2N4401 External dimensions (Units : mm) Features 2.0±0.2 UMT4401 1.3±0.1 0.9±0.1 1) BVCEO>40V (IC=1mA) 0.65 0.65 0.2 0.7±0.1 (1) (2) 2) Complements the UMT4403 / SST4403 / MMST4403 0~0.1 / PN4403. (3) (1) Emitter (2) Base 0.3+0.1 0.15±0.05 ROHM : UMT3 -0 (3) Collector EIAJ : SC-70 All terminals have the same dimensions SST4401 2.9±0.2 Package, marking, and packaging specifications +0.2 0.95 1.9±0.2 -0.1 Part No. UMT4401 SST4401 MMST4401 2N4401 0.45±0.1 0.95 0.95 Packaging type UMT3 SST3 SMT3 TO-92 (1) (2) 0~0.1 Marking R2X R2X R2X - 0.2Min. Code T106 T116 T146 T93 (3) Basic ordering unit (pieces) 3000 3000 3000 3000 (1) Emitter