AD743 Ultralow Noise BiFET 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.

Features and Benefits
  • 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
    • Amplifiers
    AD743 SPICE Macro-Model
    Data Sheets
    Documentnote
    AD743: Ultralow Noise BiFET Op Amp Data Sheet (Rev. E)PDF 290 kB
    Application Notes
    Documentnote
    AN-253: Find Op Amp Noise with SpreadsheetPDF 77 kB
    AN-940: Low Noise Amplifier Selection Guide for Optimal Noise Performance (Rev. D)PDF 199 kB
    AN-358: Noise and Operational Amplifier CircuitsPDF 593 kB
    AN-649: Using the Analog Devices Active Filter Design Tool (Rev. 0)PDF 5.3 M
    Order Information
    Part NumberPackagePacking QtyTemp RangePrice 100-499Price 1000+RoHS
    AD743JR-16 Production16 ld SOIC - WideOTH 470 to 70C7.346.99N
    AD743JR-16-REEL Production16 ld SOIC - WideREEL 10000 to 70C06.99N
    AD743JR-16-REEL7 Production16 ld SOIC - WideREEL 4000 to 70C7.346.99N
    AD743JRZ-16 Production16 ld SOIC - WideOTH 470 to 70C6.486.16Y
    AD743JRZ-16-REEL7 Production16 ld SOIC - WideREEL 4000 to 70C6.486.16Y
    AD743: Ultralow Noise BiFET Op Amp Data Sheet (Rev. E) ad743
    AD743 SPICE Macro-Model Rev. A, 4/92 ad743
    AD743A SPICE Macro-Model Rev. A, 4/92 ad743
    AD743B SPICE Macro-Model Rev. A, 4/92 ad743
    AD743K SPICE Macro-Model Rev. A, 4/92 ad743
    AD743S SPICE Macro-Model Rev. A, 4/92 ad743
    AN-253: Find Op Amp Noise with Spreadsheet ad8074
    AN-940: Low Noise Amplifier Selection Guide for Optimal Noise Performance (Rev. D) ad8628
    AN-940: 低噪声放大器选择指南 (Rev. A) ad8628
    AN-358: Noise and Operational Amplifier Circuits ad8072
    AN-358: 噪声与运算放大器电路 (Rev. 0) ad8072
    AN-649: Using the Analog Devices Active Filter Design Tool (Rev. 0) ad8350
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