⚡ BC337-40 NPN General Purpose Transistor - Multi Pack
TO-92 Package • 800mA Collector Current • 45V VCEO • hFE=250 • Professional Grade • UK Stock
BC337-40
Part Number
NPN
Transistor Type
800mA
IC Max
45V
VCEO
250
hFE Min
TO-92
Package
🔧 Industry Standard General Purpose NPN Transistor
The BC337-40 is a reliable, high-gain NPN bipolar junction transistor designed for general purpose amplification and switching applications. Perfect for audio circuits, signal processing, switching loads, and educational electronics projects. Manufactured by Diotec with consistent quality and performance.
Pack Options Available
5
Transistors
10
Transistors
20
Transistors
Comprehensive Technical Specifications
| Parameter |
Symbol |
Min |
Typ |
Max |
Unit |
Conditions |
| Part Number |
- |
BC337-40 |
- |
Diotec Semiconductor |
| Transistor Type |
- |
NPN BJT |
- |
Bipolar Junction Transistor |
| Package Type |
- |
TO-92 |
- |
Through-hole, 3-pin |
| Collector-Emitter Voltage |
VCEO |
- |
- |
45 |
V |
IB = 0 |
| Collector-Base Voltage |
VCBO |
- |
- |
50 |
V |
IE = 0 |
| Emitter-Base Voltage |
VEBO |
- |
- |
5 |
V |
IC = 0 |
| Collector Current |
IC |
- |
- |
800 |
mA |
Continuous |
| Collector Current (Peak) |
ICM |
- |
- |
1000 |
mA |
Pulsed |
| Base Current |
IB |
- |
- |
5 |
mA |
Continuous |
| DC Current Gain |
hFE |
250 |
400 |
600 |
- |
IC = 10mA, VCE = 5V |
| Collector-Emitter Saturation |
VCE(sat) |
- |
0.2 |
0.6 |
V |
IC = 10mA, IB = 0.5mA |
| Base-Emitter Saturation |
VBE(sat) |
- |
0.7 |
0.9 |
V |
IC = 10mA, IB = 0.5mA |
| Base-Emitter Voltage |
VBE |
0.58 |
0.7 |
0.77 |
V |
IC = 10mA, VCE = 5V |
| Collector-Emitter Leakage |
ICEO |
- |
- |
15 |
nA |
VCE = 30V, VBE = 0 |
| Collector-Base Leakage |
ICBO |
- |
- |
15 |
nA |
VCB = 30V, IE = 0 |
| Transition Frequency |
fT |
100 |
200 |
- |
MHz |
IC = 10mA, VCE = 20V |
| Collector-Base Capacitance |
Ccb |
- |
4.5 |
- |
pF |
VCB = 5V, f = 1MHz |
| Power Dissipation |
Ptot |
- |
- |
625 |
mW |
TA = 25°C |
| Operating Temperature |
Tj |
-55 |
- |
150 |
°C |
Junction temperature |
| Storage Temperature |
Tstg |
-65 |
- |
150 |
°C |
Non-operating |
| Thermal Resistance |
RthJA |
- |
200 |
- |
°C/W |
Junction to ambient |
| Noise Figure |
NF |
- |
2 |
4 |
dB |
IC = 0.2mA, f = 1kHz |
| Mounting Style |
- |
Through-hole |
- |
Radial leads |
| Number of Pins |
- |
3 |
- |
C-B-E configuration |
| Brand |
- |
Diotec |
- |
German semiconductor manufacturer |
| Condition |
- |
New |
- |
Original packaging |
📍 TO-92 Package Pinout Configuration
BC337-40 TO-92 Pinout (Bottom View)
┌─────┐
/ \
/ \
│ │
└───┬─┬─┬───┘
│ │ │
C B E
Pin 1: Collector (C)
Pin 2: Base (B)
Pin 3: Emitter (E)
Standard TO-92 plastic package
Lead spacing: 2.54mm (0.1")
Body dimensions: 4.58mm x 4.06mm
Lead length: 16mm typical
BC337 Series Comparison
| Part Number |
hFE Range |
VCEO (V) |
IC Max (mA) |
fT (MHz) |
Application Focus |
| BC337-16 |
100-220 |
45 |
800 |
100 |
Low gain applications |
| BC337-25 |
160-400 |
45 |
800 |
100 |
Medium gain applications |
| BC337-40 |
250-600 |
45 |
800 |
200 |
High gain, general purpose |
Perfect Applications
Audio Amplifiers
Signal Processing
Switching Circuits
Oscillator Circuits
Current Mirrors
Differential Pairs
LED Drivers
Relay Drivers
Buffer Amplifiers
Active Filters
Timer Circuits
Logic Level Conversion
Sensor Interfaces
Current Sources
Voltage Regulators
RF Amplifiers
Pulse Generators
Educational Projects
Prototype Development
Repair & Maintenance
Key Features & Benefits
- ✓ High Current Gain: hFE minimum 250, typical 400 for excellent amplification
- ✓ High Collector Current: 800mA continuous rating for power applications
- ✓ Good Frequency Response: 200MHz typical fT for audio and RF applications
- ✓ Reliable Performance: Diotec quality with consistent specifications
- ✓ Wide Operating Range: -55°C to +150°C junction temperature
- ✓ Low Noise: 2dB typical noise figure for sensitive applications
- ✓ Standard Package: TO-92 through-hole for easy prototyping
- ✓ Multiple Pack Sizes: 5, 10, or 20 pieces to suit project needs
- ✓ Cost Effective: Excellent price-performance ratio
- ✓ General Purpose: Suitable for switching and amplification
- ✓ Educational Value: Perfect for learning transistor principles
- ✓ UK Stock: Fast delivery from Derbyshire warehouse
- ✓ Proven Seller: The_Components_Shop with 99.9% positive feedback
- ✓ Professional Service: 162K+ items sold successfully
- ✓ Extended Returns: 60-day return policy for confidence
Circuit Application Examples
💡 Common Circuit Configurations
- ✓ Common Emitter Amplifier: High voltage gain, input at base, output at collector
- ✓ Common Collector (Emitter Follower): High current gain, low output impedance
- ✓ Common Base Amplifier: High frequency response, current amplification
- ✓ Switching Circuit: Digital on/off control with base current limiting
- ✓ Darlington Pair: Ultra-high gain combination with second transistor
- ✓ Current Mirror: Precision current source and sink applications
- ✓ Differential Amplifier: Balanced input, excellent CMRR performance
- ✓ Oscillator Circuit: RC, LC, and crystal oscillator designs
- ✓ Active Filter: Low-pass, high-pass, and band-pass configurations
- ✓ Voltage Regulator: Series pass element in linear regulators
Design Considerations & Application Notes
⚠️ Important Design Guidelines:
- Base Current Limiting: Always use base resistor to limit current (typical 1-10kΩ)
- Collector Load: Ensure collector resistor limits current below 800mA rating
- Heat Dissipation: Monitor power dissipation, use heatsink if > 300mW
- Frequency Response: Consider Miller capacitance at high frequencies
- Biasing: Provide proper DC bias point for linear operation
- Switching Speed: Add speed-up capacitors for fast switching
- Temperature Effects: Compensate for VBE temperature coefficient (-2mV/°C)
- ESD Protection: Handle with anti-static precautions during assembly
- Gain Variation: Design with gain margin for hFE tolerance (250-600)
- Saturation Region: Ensure adequate base drive for switching applications
Compatible Development Platforms
- ✓ Arduino Projects: Ideal for driving loads beyond GPIO capability
- ✓ Raspberry Pi: Level shifting and current amplification
- ✓ Breadboard Prototyping: Standard TO-92 fits 0.1" spacing
- ✓ PCB Design: Through-hole mounting for production
- ✓ Educational Kits: Perfect for electronics courses and labs
- ✓ Analog Circuits: Op-amp circuits, audio amplifiers
- ✓ Digital Logic: Level conversion, line drivers
- ✓ Power Electronics: Gate drivers, current sources
- ✓ Test Equipment: Signal generators, oscilloscopes
- ✓ Repair Services: Replacement for vintage equipment
Package Contents & Specifications
| Pack Size |
Quantity |
Packaging |
Price Per Unit |
Best For |
| Small Pack |
5 pieces |
Anti-static bag |
Most economical for singles |
Small projects, testing |
| Standard Pack |
10 pieces |
Anti-static bag |
Good value for money |
Medium projects, spares |
| Bulk Pack |
20 pieces |
Anti-static bag |
Best unit price |
Production, workshops |
Why Choose BC337-40?
- ✓ Industry Standard: Widely used and documented transistor
- ✓ High Gain: Minimum hFE of 250 ensures reliable amplification
- ✓ Versatile Performance: Excellent for both analog and digital circuits
- ✓ Educational Value: Perfect for learning transistor operation
- ✓ Reliable Source: Diotec quality with consistent specifications
- ✓ Easy Implementation: Standard pinout and characteristics
- ✓ Cost Effective: Professional performance at low cost
- ✓ Wide Availability: Standard component in electronic distribution
- ✓ Design Flexibility: Suitable for many circuit topologies
- ✓ Proven Performance: Decades of successful applications
🔧 Essential General Purpose NPN Transistor
The BC337-40 combines high gain, good frequency response, and reliable performance in a standard TO-92 package. Whether you're building amplifiers, switches, oscillators, or learning electronics fundamentals, this transistor delivers consistent results. Its high current gain and excellent specifications make it perfect for both educational projects and professional designs.
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