Transistors & MOSFETsCompatible

BC547 NPN Transistor – Pack of 10

Popular small-signal NPN transistors for switching LEDs, buzzers and small relays from a microcontroller, and for amplifier and oscillator circuits in school projects.

Part Number: BC547
Type: NPN bipolar transistor
Collector-Emitter Voltage: 45 V
Collector Current: 100 mA
Power Dissipation: 625 mW
DC Gain (hFE): 110–800

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Specifications

Manufacturer Part Number: BC547
Part Number: BC547
Type: NPN bipolar transistor
Collector-Emitter Voltage: 45 V
Collector Current: 100 mA
Power Dissipation: 625 mW
DC Gain (hFE): 110–800
Package: TO-92
Pinout (flat face): C – B – E
Pack Quantity: 10

Electrical characteristics

Absolute maximum ratings

Going above these limits can permanently damage the part. Design with a safety margin and use the typical values below for normal operation.

Collector-emitter voltageV_CEO
Max rating
45 V
Collector-base voltageV_CBO
Max rating
50 V
Emitter-base voltageV_EBO
Max rating
6.0 V
Collector currentI_C
Max rating
100 mA
Total power dissipation (T_A = 25 °C)P_D
Max rating
625 mW
Junction temperatureT_J
Max rating
−55 to +150 °C

Parameter	Symbol	Rating	Unit
Collector-emitter voltage	V_CEO	45	V
Collector-base voltage	V_CBO	50	V
Emitter-base voltage	V_EBO	6.0	V
Collector current	I_C	100	mA
Total power dissipation (T_A = 25 °C)	P_D	625	mW
Junction temperature	T_J	−55 to +150	°C

Typical characteristics

DC current gainh_FE
Condition: I_C = 2 mA, V_CE = 5 V
Min
110
Typ
—
Max
800
Collector-emitter saturation voltageV_CE(sat)
Condition: I_C = 10 mA, I_B = 0.5 mA
Min
—
Typ
—
Max
0.25 V
Transition frequencyf_T
Condition: I_C = 10 mA, V_CE = 5 V
Min
—
Typ
300 MHz
Max
—

Parameter	Symbol	Condition	Min	Typ	Max	Unit
DC current gain	h_FE	I_C = 2 mA, V_CE = 5 V	110	—	800	—
Collector-emitter saturation voltage	V_CE(sat)	I_C = 10 mA, I_B = 0.5 mA	—	—	0.25	V
Transition frequency	f_T	I_C = 10 mA, V_CE = 5 V	—	300	—	MHz

Description

The BC547 is the everyday NPN transistor in textbooks and hobby circuits. Use it as a switch to drive loads a GPIO pin can't power directly – an LED strip section, a buzzer or a small relay coil – or as a small-signal amplifier.

Features

NPN, 45 V collector-emitter, 100 mA collector current
High gain: h_FE 110–800
625 mW power dissipation
TO-92 package

Pinout

Flat face towards you, legs down: Collector – Base – Emitter (left to right).

Using it as a switch

Emitter to GND, load between + supply and collector, and a 1 kΩ resistor from the microcontroller pin to the base. Add a 1N4007 diode across relay or motor coils. For loads above about 100 mA, use a MOSFET instead.

Package includes

10 × BC547 transistors

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