LT1793 - Low Noise, Picoampere Bias Current, JFET Input Op Amp

Features

  • Input Bias Current, Warmed Up: 10pA Max
  • 100% Tested Low Voltage Noise: 8nV/rtHz Max
  • A Grade 100% Temperature Tested
  • Offset Voltage Over Temp: 1mV Max
  • Input Resistance: 1013 ohms
  • Very Low Input Capacitance: 1.5pF
  • Voltage Gain: 1 Million Min
  • Gain-Bandwidth Product: 4.2MHz Typ
  • Guaranteed Specifications with ±5V Supplies

Typical Application

LT1793 Typical Application
LT1793 Typical Application

Description

The LT1793 achieves a new standard of excellence in noise performance for a JFET op amp. For the first time low voltage noise (6nV/rtHz) is simultaneously offered with extremely low current noise (0.8fA/rtHz), providing the lowest total noise for high impedance transducer applications. Unlike most JFET op amps, the very low input bias current (3pA typ) is maintained over the entire common mode range which results in an extremely high input resistance (1013 ohms). When combined with a very low input capacitance (1.5pF) an extremely high input impedance results, making the LT1793 the first choice for amplifying low level signals from high impedance transducers. The low input capacitance also assures high gain linearity when buffering AC signals from high impedance transducers. The LT1793 is unconditionally stable for gains of 1 or more, even with 1000pF capacitive loads. Other key features are 250µV VOS and a voltage gain over 4 million. Each individual amplifier is 100% tested for voltage noise, slew rate (3.4V/µs) and gain-bandwidth product (4.2MHz). Specifications at ±5V supply operation are also provided. For an even lower voltage noise please see the LT1792 data sheet.

Packaging

CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
Drawing
RoHS
LT1793ACN8#PBF N-8 N C 05-08-1510 (N8) Yes
LT1793ACS8#PBF SO-8 S8 C 05-08-1610 (S8) Yes
LT1793ACS8#TRPBF SO-8 S8 C 05-08-1610 (S8) Yes
LT1793AIN8#PBF N-8 N I 05-08-1510 (N8) Yes
LT1793AIS8#PBF SO-8 S8 I 05-08-1610 (S8) Yes
LT1793AIS8#TRPBF SO-8 S8 I 05-08-1610 (S8) Yes
LT1793CN8#PBF N-8 N C 05-08-1510 (N8) Yes
LT1793CS8#PBF SO-8 S8 C 05-08-1610 (S8) Yes
LT1793CS8#TRPBF SO-8 S8 C 05-08-1610 (S8) Yes
LT1793IN8#PBF N-8 N I 05-08-1510 (N8) Yes
LT1793IS8#PBF SO-8 S8 I 05-08-1610 (S8) Yes
LT1793IS8#TRPBF SO-8 S8 I 05-08-1610 (S8) Yes


LT1793 Package Drawing
LT1793 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
(1-99)
Price
(1k)*
RoHS
LT1793ACN8#PBF N-8 C $3.95 $3.35 Yes
LT1793ACS8#PBF SO-8 C $3.95 $3.35 Yes
LT1793ACS8#TRPBF SO-8 C $3.41 Yes
LT1793AIN8#PBF N-8 I $5.00 $4.25 Yes
LT1793AIS8#PBF SO-8 I $5.00 $4.25 Yes
LT1793AIS8#TRPBF SO-8 I $4.31 Yes
LT1793CN8#PBF N-8 C $2.75 $2.25 Yes
LT1793CS8#PBF SO-8 C $2.75 $2.25 Yes
LT1793CS8#TRPBF SO-8 C $2.31 Yes
LT1793IN8#PBF N-8 I $3.80 $3.15 Yes
LT1793IS8#PBF SO-8 I $3.80 $3.15 Yes
LT1793IS8#TRPBF SO-8 I $3.21 Yes
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* 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 Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Part Number Description Price Documentation
DC417B DIP8, MS8, S8, SOT23-6 | Multi-Footprint General Purpose Board for Single Op. Amp $25.00
Buy Now
Click here to view our complete list of demo boards

Applications

  • Photocurrent Amplifiers
  • Hydrophone Amplifiers
  • High Sensitivity Piezoelectric Accelerometers
  • Low Voltage and Current Noise Instrumentation Amplifier Front Ends
  • Two and Three Op Amp Instrumentation Amplifiers
  • Active Filters

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Design Tools

LTspice

LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice

Models for the following parts are available in LTspice:
LT1793

Technical Support