LT1490 - Dual and Quad Micropower Rail-to-Rail Input and Output Op Amps


  • Rail-to-Rail Input and Output
  • Single Supply Input Range: -0.4V to 44V
  • Micropower: 50µA/Amplifier Max
  • MSOP Package
  • Specified on 3V, 5V and ±15V Supplies
  • High Output Current: 20mA
  • Output Drives 10,000pF with Output Compensation
  • Reverse Battery Protection to 18V
  • No Supply Sequencing Problems
  • High Voltage Gain: 1500V/mV
  • High CMRR: 98dB
  • No Phase Reversal
  • Gain Bandwidth Product: 200kHz

Typical Application

LT1490 Typical Application


The dual LT1490 and quad LT1491 op amps operate on all single and split supplies with a total voltage of 2V to 44V drawing only 40µA of quiescent current per amplifier. These amplifiers are reverse supply protected; they draw no current for reverse supply up to 18V. The input range of the LT1490/LT1491 includes both supplies and the output swings to both supplies. Unlike most micropower op amps, the LT1490/LT1491 can drive heavy loads; their rail-to-rail outputs drive 20mA. The LT1490/LT1491 are unity-gain stable and drive all capacitive loads up to 10,000pF when optional 0.22µF and 150 Ohms compensation is used. The LT1490/LT1491 have a unique input stage that operates and remains high impedance when above the positive supply. The inputs take 44V both differential and common mode even when operating on a 3V supply. Built-in resistors protect the inputs for faults below the negative supply up to 22V. There is no phase reversal of the output for inputs 22V below V– or 44V above V–, independent of V+. The LT1490 dual op amp is available in the 8-pin MSOP, SO and PDIP packages. The quad LT1491 is available in the 14-pin SO and PDIP packages. For new designs it is recommended that the LT1490A/LT1491A be used instead of the LT1490/LT1491. See the LT1490A/LT1491A data sheet for details.


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
LT1490CMS8#PBF MS-8 MS8 C 05-08-1660 Yes
LT1490CMS8#TRPBF MS-8 MS8 C 05-08-1660 Yes
LT1490CN8#PBF N-8 N C 05-08-1510 (N8) Yes
LT1490CS8#PBF SO-8 S8 C 05-08-1610 (S8) Yes
LT1490CS8#TRPBF SO-8 S8 C 05-08-1610 (S8) Yes
LT1490IN8#PBF N-8 N I 05-08-1510 (N8) Yes
LT1490IS8#PBF SO-8 S8 I 05-08-1610 (S8) Yes
LT1490IS8#TRPBF SO-8 S8 I 05-08-1610 (S8) Yes

LT1490 Package Drawing
LT1490 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
LT1490CMS8#PBF MS-8 C $3.00 $2.30 Yes
LT1490CMS8#TRPBF MS-8 C $2.36 Yes
LT1490CN8#PBF N-8 C $2.50 $1.95 Yes
LT1490CS8#PBF SO-8 C $2.60 $2.05 Yes
LT1490CS8#TRPBF SO-8 C $2.11 Yes
LT1490IN8#PBF N-8 I $2.85 $2.40 Yes
LT1490IS8#PBF SO-8 I $2.95 $2.55 Yes
LT1490IS8#TRPBF SO-8 I $2.61 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.

Click here to view our complete list of demo boards


  • Battery- or Solar-Powered Systems
  • Portable Instrumentation
  • Sensor Conditioning
  • Supply Current Sensing
  • Battery Monitoring
  • Micropower Active Filters
  • 4mA to 20mA Transmitters

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