OPA129
LAST TIME BUY

This product is in the process of being discontinued. Customers may still purchase limited quantities by contacting their TI sales representative or authorized distributor. Please review TI’s obsolescence policy for details on placing final orders and receiving final shipments.

Ultra-Low Bias Current Difet Operational Amplifier

Ultra-Low Bias Current Difet Operational Amplifier - OPA129

Datasheet

Ultra-Low Bias Current Difet® Operational Amplifier datasheet (Rev. A)

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This product is being discontinued. Orders for life buy purchases are available.

Replaced By LMP7721 – The device has SIMILAR FUNCTIONALITY but is not functionally equivalent to the compared device. LMP7721 has lower input bias current (20fA), higher bandwidth (17MHz) and better DC precision (150 uV Max Vos, 1.5 uV/˚C drift)

TI does not recommend using this part in a new design.

Description

The OPA129 is an ultra-low bias current monolithic operational amplifier offered in an 8-pin PDIP and SO-8 package. Using advanced geometry dielectrically-isolated FET (Difet®) inputs, this monolithic amplifier achieves a high performance level.

Difet fabrication eliminates isolation-junction leakage current—the main contributor to input bias current with conventional monolithic FETs. This reduces input bias current by a factor of 10 to 100. Very low input bias current can be achieved without resorting to small-geometry FETs or CMOS designs which can suffer from much larger offset voltage, voltage noise, drift, and poor power supply rejection.

The OPA129 special pinout eliminates leakage current that occurs with other op amps. Pins 1 and 4 have no internal connection, allowing circuit board guard traces—even with the surface-mount package version.

OPA129 is available in 8-pin DIP and SO packages, specified for operation from -40°C to +85°C.

Features

ULTRA-LOW BIAS CURRENT: 100fA max
LOW OFFSET: 2mV max
LOW DRIFT: 10µV/°C max
HIGH OPEN-LOOP GAIN: 94dB min
LOW NOISE: 15nV/Hz at 10kHz
PLASTIC DIP and SOIC PACKAGE
APPLICATIONS
- PHOTODETECTOR PREAMP
- CHROMATOGRAPHY
- ELECTROMETER AMPLIFIERS
- MASS SPECTROMETER
- pH PROBE AMPLIFIER
- ION GAGE MEASUREMENT

Difet is a registered trademark of Texas Instruments.
All other trademarks are the property of their respective owners.