BC337 General Purpose NPN Transistor
= 45V 800mA NPN Transistor for Switching and Amplification =
The BC337 is a widely used generalpurpose NPN bipolar junction transistor. It is wellsuited for low-power switching and amplification, commonly used in driver and output stages of audio amplifiers .
High Current Capability - Up to 800mA continuous collector current .
Low Voltage Operation 45V collectoremitter voltage .
Collector-Emitter Voltage (VCEO): 45V.
Continuous Collector Current (IC): 800mA .
The PNP complementary part is the BC327 transistor .
= Technical Specifications =
| Parameter | Value |
|---|
| Polarity | NPN |
| Collector-Emitter Voltage | 45V |
| Collector-Base Voltage | 50V |
| Emitter-Base Voltage | 5V |
| Continuous Collector Current | 800mA |
| Power Dissipation | 625mW |
| Transition Frequency | 100MHz to 210MHz |
| Package | TO-92 |
= hFE Classification Ranks =
The BC337 comes in different gain ranks. Typical hFE values at 100mA, 1V:
| Rank | hFE Range |
|---|
| BC337 | 100-630 |
| BC337-16 | 100-250 |
| BC337-25 | 160-400 |
| BC337-40 | 250-630 |
Check part number suffix for the specific gain rank.
Choose rank based on circuit gain requirements.
= Pin Configuration =
TO-92 package (flat side facing you, leads down):
- Pin 1: Collector
- Pin 2: Base
- Pin 3: Emitter
= Key Features =
+High Current Gain - hFE up to 630 for strong amplification .
+Good Frequency Response - 100MHz minimum transition frequency .
+Low Saturation Voltage - 0.7V max at 500mA .
+Widely Available TO92 through-hole package for easy breadboarding .
== Applications ==
- Audio preamplifiers and low-power amplifier stages .
- Driver and output stages of audio amplifiers .
- General-purpose switching circuits .
- Sensor signal conditioning.
- Home appliances and audio systems .
Reliable and Versatile - A proven standard component for electronics work.
ThroughHole Package TO-92 fits standard breadboards and PCBs.
√ Suitable for 3.3V and 5V logic circuits.
√ Complementary PNP pair is BC327.
√ Available from multiple manufacturers.
= Troubleshooting =
Transistor not switching:
- Verify base-emitter voltage is above 0.7V.
- Check base current and resistor values.
- Ensure load current does not exceed 800mA.
Excessive heat:
- Verify collector current within 800mA limit.
- Ensure power dissipation does not exceed 625mW.
- Check for correct biasing.
