View 2sc4491 datasheet:

Ordering number:EN3036 NPN Epitaxial Planar Silicon Transistor 2SC4491 L Load (Various Drivers) Switching Applications Applications Package Dimensions · Suitable for use in switching of L load (motor unit:mm drivers, printer hammer drivers, relay drivers). 2064A [2SC4491] 2.5 1.45 Features 6.9 1.0 · Darlington connection. · On-chip Zener diode of 60± 10V between collector and base. · Uniformity in collector-to-base voltage. · High DC current gain. 0.6 · Wide ASO. 0.9 0.5 · Large inductive load handling capability. 1 2 3 0.45 1 : Emitter 2 : Collector 3 : Base 2.54 2.54 SANYO : NMP Specifications Absolute Maximum Ratings at Ta = 25?C Parameter Symbol Conditions Ratings Unit Collector-to-Base Voltage VCBO 50* V Collector-to-Emitter Voltage VCEO 50* V