ZTX450 Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 45 V
• Collector-Base Voltage, max: 60 V
• Emitter-Base Voltage, max: 5 V
• Collector Current − Continuous, max: 1 A
• Collector Dissipation: 1 W
• DC Current Gain (h_fe): 100 to 300
• Transition Frequency, min: 150 MHz
• Operating and Storage Junction Temperature Range: -55 to +200 °C
• Package: TO-92

The ZTX450 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.
Here is an image showing the pin diagram of this transistor.The complementary PNP transistor to the ZTX450 is the ZTX550.The 2SD1622 (SOT-89), 2SD602A (SOT-23), 2SD874A (SOT-89), BCW66 (SOT-23) and MMBT100 (SOT-23) is the SMD version of the ZTX450 transistor. These transistors are of the same type, have similar parameters and are designed for surface mounting.You can replace the ZTX450 with the BC537, BC538, MPS651, MPS651G or PN4033.