SN74HCT540: Question about SN74HCT540 :

Elias NEJJARY

Part Number: SN74HCT540
Other Parts Discussed in Thread: ULN2803A,

Hello,

I have an assembly with the SN74HCT540 followed by another inverter (ULN2803A).I would like to know if I can replace these 2 components with the 74HCT541.

Thank you.

5 months ago

0 Clemens Ladisch 5 months ago

Guru 267110 points

The ULN can handle higher voltages and currents. It is unlikely that a HCT output would be able to handle the load.

0 Elias NEJJARY 5 months ago in reply to Clemens Ladisch

Prodigy 20 points

This should enable me to control relays. Should I keep the existing assembly? Thank you in advance for your reply.

0 Clemens Ladisch 5 months ago in reply to Elias NEJJARY

Guru 267110 points

This depends on the relays. Do they work with 5 V and 6 mA?

0 Elias NEJJARY 5 months ago in reply to Clemens Ladisch

Prodigy 20 points

The rated voltage is 24 VDC and the rated current is 8.3 mA.

+1 Clemens Ladisch 5 months ago in reply to Elias NEJJARY

Guru 267110 points

I do not know whether "rated" refers to the maximum or minimum, but this sounds as if you actually need a strong driver like the ULN.

0 Elias NEJJARY 5 months ago in reply to Clemens Ladisch

Prodigy 20 points

thank you for your help

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SN74HCT540: Question about SN74HCT540 :