ZTX688B Bipolar Transistor

• Type: NPN
• Collector-Emitter Voltage, max: 12 V
• Collector-Base Voltage, max: 12 V
• Emitter-Base Voltage, max: 5 V
• Collector Current − Continuous, max: 3 A
• Collector Dissipation: 1.5 W
• DC Current Gain (h_fe): 400
• Transition Frequency, min: 150 MHz
• Operating and Storage Junction Temperature Range: -55 to +200 °C
• Package: TO-92

The ZTX688B 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.You can replace the ZTX688B with the ZTX689B.