2N3904 Small Signal Transistor (NPN) Features • NPN Silicon Epitaxial Planar Transistor for switching and amplifier applications. • As complementary type, the PNP transistor 2N3906 is recommended. • On special request, this transistor is also manufactured in the pin configuration TO-18. • This transistor is also available in the SOT-23 2N3904 General Purpose Transistors NPN TO-92 Page 1 31/05/05 V1.0 High Speed Switching Features: • NPN Silicon Planar Switching Transistors. • Fast switching devices exhibiting short turn-off and low saturation voltage characteristics. NPN General Purpose Amplifier This device is designed as a general purpose amplifier and switch. The useful dynamic range extends to 100 mA as a switch and to 100 MHz as an amplifier. Absolute Maximum Ratings* T A = 25°C unless otherwise noted

Rev. C/CZ MMBT3904 SMD General Purpose Transistor (NPN) www.taitroncomponents.com Page 3 of 9 Fig.1- Delay and Rise Time Fig.2- Storage and Fall Time – Information on datasheets The Transistor (NPN) • A current amplifier … – Makes small currents BIGGER • The 2N3904 Transistor β = 30-400 C= Collector B = Base E = Emitter Important 2N3904 Specifications from the datasheet Note high maximum ratings BUT 200mA maximum current 2N3904 Datasheet • Posted on the ME456 website