Click on the following link for product video demo presentation. https://youtu.be/kZmE3ou3UpA

2N3904 NPN Bipolar Transistor

The 2N3904 is manufactured in a plastic TO-92 case. When looking at the flat side with the leads pointed downward, the three leads emerging from the transistor are, from left to right, the emitter, base, and collector leads.
The complementary p-n-p transistor to the 2N3904 is the 2N3906.

Type - NPN
Collector-Emitter Voltage: 40 V
Collector-Base Voltage: 60 V
Emitter-Base Voltage: 6 V
Collector Current: 0.2 A
Collector Dissipation - 0.625 W
DC Current Gain (hfe) - 100 to 300
Transition Frequency - 300 MHz
Noise Figure - 5 dB
Operating and Storage Junction Temperature Range -55 to +150 °C
Package - TO-92

You can replace the 2N3904 with the 2N4401, 2SC1008, 2SC1210, 2SC1211, 2SC815, BC537, BC538, KN2222A, KN3904, KSC1008, KSC815, KSP05, KSP06, KSP2222A, KSP8098, KSP8099, KTN2222A, MPS2222A, MPS2222AG, MPS650, MPS650G, MPS651, MPS651G, MPS8098, MPS8098G, MPS8099, MPS8099G, MPSA05, MPSA05G, MPSA06, MPSA06G, MPSW01A, MPSW01AG, MPSW05, MPSW05G, MPSW06, MPSW06G, NTE123AP, P2N2222A, P2N2222AG, PN100, PN2219A, PN2222A, PN3569, PN4033 or ZTX450