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OP221GSZ

OP221GSZ Dual Instrumentation Amplifier, 600kHz

MPNOP221GSZ
End of Life

Analog Devices OP221GSZ, dual instrumentation amplifier, 8-SOIC surface mount, 600 kHz -3dB bandwidth, 0.3 V/µs slew rate, 850 µA supply per channel, 5 V to 30 V supply range, -55°C to 125°C operating temperature.

$9.31Ref. price · indicative, final on quote
Packaging8-SOIC (0.154", 3.90mm Width)
RoHSROHS3 Compliant
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

OP221GSZ specifications
ParameterValue
Output typeDifferential
MountingSurface Mount
Amplifier typeInstrumentation
Voltage - input offset250 µV
Voltage - supply span30 V
Current - supply850µA (x2 Channels)
Current - input bias70 nA
Operating temperature-55°C ~ 125°C
-3db bandwidth600 kHz
PackageTube
Slew rate0.3V/µs
Case8-SOIC (0.154\", 3.90mm Width)
Number of circuits2

Product details

Dual instrumentation amp with a -55°C floor

The 600 kHz -3dB bandwidth and 0.3 V/µs slew rate tell you this is a precision measurement part, not a high-speed buffer — think bridge sensor conditioning, thermocouple amplification, or current-shunt monitoring where the signal changes slowly and common-mode rejection matters more than raw speed.

Supply span runs from 5 V minimum to 30 V maximum, so it works on a single 5 V rail or a ±15 V split supply without a secondary regulator. Input bias current of 70 nA matters when your source impedance climbs above 10 kΩ: that 70 nA across a 10 kΩ source adds 700 µV of offset error, which lands right on top of the 250 µV intrinsic offset. Keep source impedance balanced and below 1 kΩ for best DC accuracy.

The output type is differential, which means the two outputs swing in opposite polarity around a common-mode voltage. This pairs directly with a differential-input ADC — you get twice the signal swing for a given supply and cancel common-mode noise picked up on the board. If your ADC has a single-ended input, you'll need a differential-to-single-ended converter stage or an instrumentation amp with a single-ended output. Check your ADC front-end before committing the board layout.

Frequently asked questions

What is the difference between OP221GSZ and the AD623BRZ?

The AD623BRZ offers a rail-to-rail output, lower input bias current (17 nA), and lower input offset voltage (25 µV typical), but it is a single-channel part with a narrower temperature band. The OP221GSZ gives you two channels in one 8-SOIC package and the extended temperature range — the right choice when you need dual-channel instrumentation and military-grade thermal endurance.