C945 Transistor (TO-92) Pinout, Features, Equivalents, Datasheet

The C945 is a silicon NPN low-power transistor with an epitaxial base and housed in a TO-92 package suitable for low-power tasks in switching and amplification.

It can handle up to 60V for collector-base and 50V for collector-emitter voltages, with a maximum collector current of 150mA. The emitter-base voltage is 5V, and this transistor can dissipate up to 200mW of power. With a minimum Beta (β) of 70, the C945 transistor ensures reliable performance across various applications.

2SD882 Pinout Configuration

The pin configuration of the C945 transistor is as follows:

Pin No.	Name	Description
1	Collector	Electrons Emitted from Emitter Collected by the Collector.
2	Emitter	Electrons emitted from the emitter into the first PN.
2	Base	Controls the biasing of the transistor.

Absolute Maximum Ratings of C945

The quick technical specifications and features of the c945 transistor are given below:

• Transistor Type: Si
• Polarity: NPN
• Emitter-Base Voltage (Veb max.): 5V
• Collector Power Dissipation (Pc max.): 200mW
• Collector-Base Voltage (Vcb max.): 60V
• Collector-Emitter Voltage (Vce max.): 50V
• Collector Current (Ic max.): 150mA
• Operating Junction Temperature (Tj): -55°C to 125°C
• Transition Frequency (ft): 150MHz
• Collector Capacitance (Cc): 3pF
• Forward Current Transfer Ratio (hFE min.): 70
• Noise Figure (dB): -
• Package: TO-92

Note: Complete Technical Details can be found in the C945 transistor datasheet given at the end of this page.

C945 PNP Complementary

There are no complementary PNP transistors to the C945.

BD139 Equivalent Transistor

There are no equivalent NPN transistors to the C945 in terms of their package, emitter-base voltage, transition frequency, collector capacitance, and forward current transfer ratio.

Applications of BD139

1. Switching load of up to 200mA
2. Relay driver
3. LED drivers
4. SMPS
5. Electrical signals

C945: 2D Model and Dimensions

If you are designing a PCB or perf board with this component, the following picture from the C945 datasheet will be useful to determine its package type and dimensions.

Component Datasheet

C945 Datasheet

C945 Safe Operating Guidelines

It is recommended not to push the C945 transistor to its absolute limits. It's best to stay at least 20% below its maximum ratings. For example, while it can handle a maximum load of 200mA, it's safer to avoid exceeding 160mA. Similarly, its maximum load voltage is 50V, so it's advisable to stay below 40V. Additionally, ensure the transistor's temperature stays between -55°C and +125°C for proper operation.