Transistor as as switch - replace BC547 with S8050

Hello,

When transistor is used as a switch what parameters I should look to find suitable replacement?
I need to find out is S8050 suitable replacement for BC547.

Kind regards.

Collector-Base Voltage
BC547/550 50

Collector-Emitter Voltage
BC547/550 45

Emitter-Base Voltage
BC546/547 5

Collector Current (DC)
100 mA

Collector Power Dissipation
500 mW

DC Current Gain
VCE=5V, IC=2mA 110-800

http://media.nkcelectronics.com/datasheet/s8050.pdf

Collector-Base Voltage V
30

Collector-Emitter Voltage
20

Emitter-Base Voltage
5

Collector Dissipation(Ta=25°)
1 W

Collector Current
Ic 700 mA

DC Current Gain(note)
hFE 110-400

The BC547 is categorized as "designed for use as general purpose amplifiers and switches requiring collector currents to 300 mA."

The S8050 is categorized as "a low voltage high current small signal NPN transistor, designed for Class B push-pull audio amplifier and general purpose applications."

Hello,

I looked at the datasheets of both transistors, and almost right away I noticed the “large” difference of the max voltages. Since I don’t know in what kind of circuitry you want to use the S8050, more particularly what the max voltages are, I can’t determine if you can use S8050. Are you from Europe? The BC547 was a very popular transistor used in European magazines, especially in Belgium and the Netherlands.

Here are some images taken from the datasheets.

I hope this helps you.

Mike

Darn, I can’t post the images in the text, had to include them as attachments, sorry

botzko:
Hello,

When transistor is used as a switch what parameters I should look to find suitable replacement?
I need to find out is S8050 suitable replacement for BC547.

Kind regards.

For a switch the saturation characteristics (including turn off time), leakage current, and max voltage are the main parameters you care about.

Thank you all.

@Mikeb1970 the voltage is 12V, so this should be fine because both transistor support higher voltage.

@MarkT - may be stupid question but what are the saturation characteristics for the transistor? Also I'm checking
https://www.sparkfun.com/datasheets/Components/BC546.pdf and
http://media.nkcelectronics.com/datasheet/s8050.pdf
but can not find the turn off time.

At 12 volt there are no problems indeed on this part.
I'm sure I have a BC547 here, the biggest problem is were is it located.
Anyway, would it help you out if I could send it to you?

Thank you @Mikeb1970. I will be able to buy BC547 but I will use the S8050 because I have it :).