LMC7101: Substitute with higher capacitive load drive

Patrick Ruf

Part Number: LMC7101
Other Parts Discussed in Thread: LMC7111, TLV2711, TLV2721, TLV2731

Hi,

I'm looking for a replacement of the LMC7101 with the same pin-out. The replacement must have a higher capacitive load drive capability.

I have tried the TI Amplifier Selector Guide "Selguide" but it is quite a pain as there seems to be a lot of different SOT-23 pin-outs.

Any ideas for that?

Thanks and best regards,
Patrick

over 2 years ago

+1 Caro Walter over 2 years ago

TI__Mastermind 19397 points

Hello Patrick,

What is the supply voltage used in the application and what is the capacitive load that needs to be driven?
Could you share some details on the circuit configuration? Or a schematic?

This is a rather odd pinout, from what I can gather National created this pinout (non standard NW DBV). Here is a thread in which Paul Grohe outlines the devices that share the same pinout: https://e2e.ti.com/support/amplifiers-group/amplifiers/f/amplifiers-forum/780305/lmc7101-pin-to-pin-compatible-part-with-lower-offset

LMC7111
TLV2711
TLV2721
TLV2731
TLV6001R

However, not all of these share the same supply voltage capabilities and/or PM v Cap load drive.

Is there any possibility to change the design to the standard DBV (SOT23 -5):

All the best,
Carolina

0 Zoltan Gingl over 2 years ago

Prodigy 230 points

Hi,
Alternatively, you may try to improve the capacitive load capability of the LMC7101, see this reference: https://www.ti.com/lit/ug/tidu032c/tidu032c.pdf
Best wishes, Zoltan

0 Patrick Ruf over 2 years ago

Genius 4880 points

Hi Carolina,

This list already helps a lot. Thanks. Supply voltage is 5V (single supply).
The load is four 1nF capacitors each isolated with a 50Ohm resistor from the OPAMP output (part of a test equipment). Unfortunately, I have overseen this capacitive loading in my OPAMP selection.
Then I thought it is an easy task to replace the LMC7101 with a newer OPAMP. But I was not aware that the LMC7101 has a different pin-out than most other SOT23-5 OPAMPs.

I will try the TLV2711, the TLV2731 and the TLV6001R.

Regards,
Patrick