TL331B: power supply of TL331B

Eric Sun

Part Number: TL331B
Other Parts Discussed in Thread: LM339

Hi,here is a IEC61851/J1772 Interface circuit,th CP is 1kHZ square wave ,amplitude is ±12V.but the TL331B is powered by 3.3v,if the CP short with +12V power supply ,does the TL331B will be damaged ?

over 1 year ago

0 Clemens Ladisch over 1 year ago

Guru 258600 points

This is OK; the absolute maximum ratings allow voltages up to 38 V.

+1 Paul Grohe over 1 year ago

TI__Guru 51456 points

Hello Eric,

As Clemens showed, the input may be taken up to 38V without damage.

Though I would also place a resistor in series with the input to limit any transient currents (~10k should be fine).

Maximum input voltage is 3.3V - 2V = 1.3V. If you can bring the threshold down below 1.3V, then the output could still be correct.

See section 2 of the LM339 family appnote:

Application Design Guidelines for LM339, LM393, TL331 Family Comparators

0 Eric Sun over 1 year ago in reply to Clemens Ladisch

Intellectual 300 points

Thank you very much.It means it will not demage the chip if the input signal did not exceed 38V although the supply voltage(e.g 3.3V) is less than the input signal voltage.

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TL331B: power supply of TL331B