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AD743:  Ultralow Noise BiFET Op Amp

Product Details

Newer Alternatives:
  • ADA4627-1 30 V, 19 MHz, Low Noise, Low Bias Current, JFET Op Amp

The AD743 is an ultralow noise precision, FET input, monolithic operational amplifier. It offers a combination of the ultralow voltage noise generally associated with bipolar input op amps and the very low input current of a FET-input device. Furthermore, the AD743 does not exhibit an output phase reversal when the negative common-mode voltage limit is exceeded.

The AD743's guaranteed, maximum input voltage noise of 4.0 nV/(root)Hz at 10 kHz is unsurpassed for a FET-input monolithic op amp, as is the maximum 1.0 µV p-p, 0.1 to 10 Hz noise. The AD743 also has excellent dc performance with 250 pA maximum input bias current and 0.5 mV maximum offset voltage.

The AD743 is specifically designed for use as a preamp in capacitive sensors, such as ceramic hydrophones. It is available in five performance grades. The AD743J and AD743K are rated over the commercial temperature range of 0°C to +70°C. The AD743A and AD743B are rated over the industrial temperature range of -40°C to +85°C. The AD743S is rated over the military temperature range of -55°C to +125°C and is available processed to MIL-STD-883B, Rev. C.

The AD743 is available in 8-pin plastic mini-DIP, 8-pin cerdip, 16-pin SOIC, or in chip form.


  • Ultralow Noise Performance
    2.9 nV/vHz at 10 kHz
    0.38 µV p-p, 0.1 Hz to 10 Hz
    6.9 fA/vHz Current Noise at 1 kHz

  • Excellent DC Performance
    0.5 mV Max Offset Voltage
    250 pA Max Input Bias Current
    1000 V/mV Min Open-Loop Gain
  • AC Performance
    2.8 V/µs Slew Rate
    4.5 MHz Unity-Gain Bandwidth
    THD = 0.0003% @ 1 kHz
    Available in Tape and Reel in
    Accordance with EIA-481A Standard

Pin Configuration Diagram for AD743

AD743 Diagram
Pin Configuration Diagram for AD743


Title Content Type File Type
AD743: Ultralow Noise BiFET Op Amp Data Sheet  (Rev E, 07/2003) (pdf, 290 kB) Data Sheets PDF
AN-940: Low Noise Amplifier Selection Guide for Optimal Noise Performance  (pdf, 199 kB) Application Notes PDF
AN-649: Using the Analog Devices Active Filter Design Tool  (pdf, 5301 kB) Application Notes PDF
AN-358: Noise and Operational Amplifier Circuits  (pdf, 593 kB) Application Notes PDF
AN-253: Find Op Amp Noise with Spreadsheet  (pdf, 77 kB) Application Notes PDF
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

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Price, packaging, availability

AD743 Model Options
Model Package Pins Temp.
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
AD743JR-16 Status: Not recommended** 16 ld SOIC - Wide 16 Comm. Tube, 47 $6.80 $6.47 N  Material Info PCN Purchase
AD743JR-16-REEL Status: Production 16 ld SOIC - Wide 16 Comm. Reel, 1000 - $6.47 N  Material Info PCN Purchase
AD743JR-16-REEL7 Status: Not recommended** 16 ld SOIC - Wide 16 Comm. Reel, 400 $6.80 $6.47 N  Material Info PCN Purchase
AD743JRZ-16 Status: Production 16 ld SOIC - Wide 16 Comm. Tube, 47 $6.00 $5.70 Y  Material Info PCN Purchase
AD743JRZ-16-REEL Status: Not recommended** 16 ld SOIC - Wide 16 Comm. Reel, 1000 - $5.70 Y  Material Info PCN/PDN Purchase
AD743JRZ-16-REEL7 Status: Not recommended** 16 ld SOIC - Wide 16 Comm. Reel, 400 $6.00 $5.70 Y  Material Info PCN Purchase
Price Table Help

The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
**When "Not recommended" is shown in the product status, it means that the model is still in production, but is not recommended for new design.

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