parallel output pins of uln2803

archiecles123 · Sep 9, 2011

can i parallel 4 output pins of uln2803 so that it can have current greater than 1A? thanks

Reloadron · Sep 9, 2011

The ULN2803A is a high-voltage, high-current
Darlington transistor array. The device consists of
eight npn Darlington pairs that feature
high-voltage outputs with common-cathode
clamp diodes for switching inductive loads. The
collector-current rating of each Darlington pair is
500 mA. The Darlington pairs may be connected
in parallel for higher current capability.

I believe that makes it pretty clear that you can. This is the data sheet.

Ron

Boncuk · Sep 9, 2011

Observe the maximum power dissipation of the package.

It's 2.1W! (Source: datasheet ULN2803 Allegromicro)

Boncuk

ronsimpson · Sep 9, 2011

The maximum current per IC is 2.5 amps!

Total substrate-terminal current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −2.5 A

Boncuk · Sep 9, 2011

ronsimpson said:
The maximum current per IC is 2.5 amps!

That won't change the max power dissipation, does it?

Boncuk

parallel output pins of uln2803

archiecles123

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