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Texas Instruments OPA991IDCKR — Analog & Data Acquisition

TI OPA991IDCKR General-Purpose Op-Amp, 4.5 MHz

MPNOPA991IDCKR
End of Life

Texas Instruments OPA991IDCKR, single general-purpose op-amp, 4.5 MHz gain bandwidth, 21 V/µs slew rate, rail-to-rail output, 2.7 V to 40 V supply, SC-70-5 package, -40°C to 125°C.

$1.43Ref. price · indicative, final on quote
Packaging5-TSSOP, SC-70-5, SOT-353
RoHSNot applicable
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

OPA991IDCKR specifications
ParameterValue
Output typeRail-to-Rail
MountingSurface Mount
Amplifier typeGeneral Purpose
Voltage - input offset125 µV
Voltage - supply span2.7 V
Current - supply560µA
Current - input bias10 pA
Current - output (Channel)75 mA
Operating temperature-40°C ~ 125°C (TA)
Gain bandwidth product4.5 MHz
PackageTape & Reel (TR); Cut Tape (CT)
Slew rate21V/µs
Case5-TSSOP, SC-70-5, SOT-353
Number of circuits1

Product details

What this single op-amp brings to the rail

Supply range spans 2.7 V to 40 V, so the same part works in a 3.3 V sensor front-end or a 24 V industrial control loop. Input bias current sits at 10 pA, making it usable with high-impedance sources like photodiodes or pH probes. Output can source or sink 75 mA per channel, enough to drive a moderate load or a reference buffer.

Where it fits on the board

The SC-70-5 footprint is about 2 mm × 2.1 mm — small enough to slip into a tight multi-channel array or a space-constrained sensor module. Surface-mount only, so plan for reflow or hand-solder with fine tip. Supply span from 2.7 V to 40 V means you can run it off an unregulated 12 V battery rail or a regulated 5 V logic supply without a separate LDO.

TI lists the OPA991IDCKR as Active.

Frequently asked questions

What is the OPA991IDCKR equivalent or cross reference?

The closest functional second-source in the same SC-70-5 footprint is the TLV9351IDCKR from TI. It offers similar 3.5 MHz GBW and 20 V/µs slew rate, same 10 pA input bias, and same rail-to-rail output. The TLV9351IDCKR has a higher input offset voltage (350 µV vs 125 µV) and a lower output current (60 mA vs 75 mA). For a dual-channel alternative, the TLV9362IDDFR (10.6 MHz, 25 V/µs) in a different package is a step up in speed but not a pin-for-pin swap.

Is OPA991IDCKR single-supply?

Yes. The 2.7 V to 40 V supply span covers single-supply operation from 3.3 V, 5 V, 12 V, or 24 V rails. Rail-to-rail output lets the signal swing close to both supply rails without external level shifting.