OPA129 Ultra-Low Bias Current Difet Operational Amplifier | TI.com

OPA129 (LIFEBUY) Ultra-Low Bias Current Difet Operational Amplifier

 

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. This product continues to be in production to support existing customers.

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.
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