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OPA333: OPA333 with power supply rail exceeding 5.5V?

chen shi
Prodigy 155 points
Part Number: OPA333

Hi.

I use OPA333 as noninverting 10x amplifier. The amplifier should have its output rail including 0, or sometimes maybe a bit lower, of no more than 1mV below 0.

So, I use +4.7V and -0.7V power supply. +4.7V is from a zenor, and -0.7V from a diode like 1N4148, with resistors connected to regulated +9V and -9V to limit current.

It works well, with no line frequency noise.

The absolute characteristic of OPA333's power supply voltage is limited within 7V, and the recommended power supply rail is +5.5V.

Now, I want to directly use +5V from a 78L05, and -0.7V. The power supply rail is up to 5.7V, exceeding 5.5V.

Will OPA333 work with 5.7V, or say, up to 6V power supply?

Thanks.

  • 0
    TI__Intellectual 1095 points

    Hi Chen,

    Yes, it will - the datasheet specifies 7V as the maximum rated supply voltage. This means the device won't be damaged if you supply it with 5.7V or 6V.

    Having said this, operating OPA333 above the maximum specified supply voltage of 5.5V, may result in some of the datasheet parameters being above the max/min specified values. Therefore, it is the best to power the op amp with maximum 5.5V to assure that the op amp meets all the specified datasheet limits.

    Best,
    Miriam