View rn1901fs-1906fs j9 jf f2-3-4-5 fs6 datasheet:

RN1901FS~RN1906FS TOSHIBA Transistor Silicon NPN Epitaxial Type (PCT process) (Bias Resistor built-in Transistor) RN1901FS,RN1902FS,RN1903FS RN1904FS,RN1905FS,RN1906FS Switching, Inverter Circuit, Interface Circuit and Unit: mm Driver Circuit Applications 1.0±0.05 0.8±0.05 0.1±0.05 0.1±0.05 • Two devices are incorporated into a fine pitch Small Mold (6 pin) package. 1 6 • Incorporating a bias resistor into a transistor reduces parts count. Reducing the parts count enable the manufacture of ever more 5 2 compact equipment and save assembly cost. 4 3 • Complementary to RN2901FS~RN2906FS Equivalent Circuit and Bias Resistor Values C Type No. R1 (k?) R2 (k?) 1.EMIITTER1 (E1) 2.BASE1 (B2) 3.COLLECTOR2 (C2) RN1901FS 4.7 4.7 R1 4. EMIITTER2 (E2) B