Skip to main content
Analog Devices LT1491AIN — Analog & Data Acquisition

LT1491AIN Quad General-Purpose Op-Amp, 200 kHz

MPNLT1491AIN
End of Life

Linear Technology LT® series, LT1491AIN, quad general-purpose op-amp, 200 kHz gain bandwidth, 0.06 V/µs slew rate, rail-to-rail output, 2 V to 44 V supply, 50 µA per channel supply current, 14-DIP through-hole package, -40°C to 85°C operating temperature.

$8.0Ref. price · indicative, final on quote
Packaging14-DIP (0.300", 7.62mm)
SeriesLT®
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

LT1491AIN specifications
ParameterValue
SeriesLT®
Output typeRail-to-Rail
MountingThrough Hole
Amplifier typeGeneral Purpose
Voltage - input offset285 µV
Voltage - supply span44 V
Current - supply50µA (x4 Channels)
Current - input bias1 nA
Current - output (Channel)25 mA
Operating temperature-40°C ~ 85°C
Gain bandwidth product200 kHz
PackageBulk
Slew rate0.06V/µs
Case14-DIP (0.300\", 7.62mm)
Number of circuits4

Product details

Quad op-amp for industrial and battery-powered signal chains

Each of the four amplifiers draws just 50 µA of supply current, making this part a strong candidate for multi-channel sensor conditioning in battery-operated instruments or loop-powered transmitters where every microamp is budgeted. The supply voltage span runs from 2 V up to 44 V, so the same device can serve a 3.3 V portable design or a 24 V industrial control board without a regulator change.

No separate low-voltage or high-voltage variant is needed across a mixed-rail BOM — the same quad op-amp can appear on both the 3.3 V analog front-end and the 24 V actuator driver board.

Through-hole package — design-in considerations

The 14-DIP (0.300" row spacing) and 14-PDIP supplier package are breadboard-friendly and survive rework cycles well, but they occupy roughly four times the board area of a comparable SOIC-14. For dense mixed-signal boards, the larger footprint also means longer trace runs to the feedback network — watch for parasitic capacitance on the inverting input if the GBW is pushed near its 200 kHz limit.

Frequently asked questions

Is LT1491AIN a rail-to-rail op-amp?

Yes, the output stage is rail-to-rail, meaning the output can swing within millivolts of both supply rails. The input common-mode range, however, is not rail-to-rail — it extends from the negative rail up to about 1.1 V below the positive rail, so high-side sensing at low supply voltages needs attention.

What is a suitable replacement or equivalent for LT1491AIN?

The AD8619WARZ-R7 is a quad CMOS rail-to-rail op-amp with a 400 kHz GBW and lower input bias (0.2 pA), but it comes in a surface-mount package only and has a 1.8 V minimum supply versus the LT1491AIN's 2 V. For a through-hole replacement, parametric equivalents are scarce; the LT1491AIN's combination of 14-DIP package, 44 V supply, and 50 µA per channel is uncommon.