Signal Conditioning Operational Amplifiers (Op Amps) Low Power Amplifiers (Is < 1mA)
Space & Harsh Environment Extended Temperature Plastic (H & MP) Extended Temperature (H & MP) Op Amps

LT1636 - Over-The-Top Micropower Rail-to-Rail Input and Output Op Amp

LT5400 - Quad Matched Resistor Network

LT1491A - Quad Over-The-Top Micropower Rail-to-Rail Input and Output Op Amps

Features

  • Low Input Offset Voltage: 500µV Max
  • Output Swings to 10mV Max from V –
  • Rail-to-Rail Input and Output
  • Micropower: 50µA/Amplifier Max
  • Over-The-Top® Input Common Mode Range Extends 44V Above V –, Independent of V +
  • 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
  • Tiny 3mm × 3mm × 0.8mm DFN Package

Typical Application

LT1491A Typical Application

Description

The LT®1490A/LT1491A are dual and quad op amps with a low input offset voltage of 500µV max. The LT1490A/LT1491A 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 virtually no current for reverse supply up to 18V. The input range of the LT1490A/LT1491A includes both supplies and the output swings to both supplies. Unlike most micropower op amps, the LT1490A/LT1491A can drive heavy loads; their rail-to-rail outputs drive 20mA. The LT1490A/LT1491A are unity-gain stable and drive all capacitive loads up to 10,000pF when optional 0.22µF and 150Ω compensation is used.

The LT1490A/LT1491A 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 15V. There is no phase reversal of the output for inputs 15V below V– or 44V above V–, independent of V+.

The LT1490A dual op amp is available in the 8-pin MSOP, PDIP and SO packages. For space limited applications LT1490A is available in a 3mm × 3mm × 0.8mm, dual fine pitch leadless package (DFN). The quad LT1491A is available in the 14-pin SO, PDIP and 5mm × 3mm × 0.8mm DFN packages.

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
LT1491ACDHC#PBF 5x3 DFN-16 DHC C 05-08-1706 Yes
LT1491ACDHC#TRPBF 5x3 DFN-16 DHC C 05-08-1706 Yes
LT1491ACN#PBF N-14 N C 05-08-1510 (N14) Yes
LT1491ACS#PBF SO-14 S C 05-08-1610 (S14) Yes
LT1491ACS#TRPBF SO-14 S C 05-08-1610 (S14) Yes
LT1491AHS#PBF SO-14 S H 05-08-1610 (S14) Yes
LT1491AHS#TRPBF SO-14 S H 05-08-1610 (S14) Yes
LT1491AIDHC#PBF 5x3 DFN-16 DHC I 05-08-1706 Yes
LT1491AIDHC#TRPBF 5x3 DFN-16 DHC I 05-08-1706 Yes
LT1491AIN#PBF N-14 N I 05-08-1510 (N14) Yes
LT1491AIS#PBF SO-14 S I 05-08-1610 (S14) Yes
LT1491AIS#TRPBF SO-14 S I 05-08-1610 (S14) Yes


LT1491A Package Drawing
LT1491A Package Drawing
LT1491A Package Drawing
LT1491A Package Drawing
LT1491A 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
LT1491ACDHC#PBF 5x3 DFN-16 C $4.00 $3.40 Yes
LT1491ACDHC#TRPBF 5x3 DFN-16 C $3.46 Yes
LT1491ACN#PBF N-14 C $3.55 $3.00 Yes
LT1491ACS#PBF SO-14 C $3.60 $3.05 Yes
LT1491ACS#TRPBF SO-14 C $3.11 Yes
LT1491AHS#PBF SO-14 H $4.65 $3.90 Yes
LT1491AHS#TRPBF SO-14 H $3.96 Yes
LT1491AIDHC#PBF 5x3 DFN-16 I $4.85 $4.10 Yes
LT1491AIDHC#TRPBF 5x3 DFN-16 I $4.16 Yes
LT1491AIN#PBF N-14 I $4.25 $3.60 Yes
LT1491AIS#PBF SO-14 I $4.40 $3.70 Yes
LT1491AIS#TRPBF SO-14 I $3.76 Yes
Buy Now • Request Samples
* 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

Applications

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

People Who Viewed This Product Also Viewed

Product Notifications

Please login to your MyLinear account for notifications of datasheet updates, new document releases and LTspice model announcements for your favorite products. If you do not have a MyLinear account you may Sign Up Now.

Forgot your password? Click here.
Need help? Email mylinear@linear.com with questions and comments.

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:
LT1491

Technical Support