LT1025 - Micropower Thermocouple Cold Junction Compensator

Features

  • 80µA Supply Current
  • 4V to 36V Operation
  • 0.5°C Initial Accuracy (A Version)
  • Compatible with Standard Thermocouples (E, J, K, R, S, T)
  • Auxiliary 10mV/°C Output
  • Available in 8-Lead PDIP and SO Packages

Typical Application

LT1025 Typical Application
LT1025 Typical Application

Description

The LT™1025 is a micropower thermocouple cold junction compensator for use with type E, J, K, R, S, and T thermocouples. It utilizes wafer level and post-package trimming to achieve 0.5°C initial accuracy. Special curvature correction circuitry is used to match the �bow� found in all thermocouples so that accurate cold junction compensation is maintained over a wider temperature range.

The LT1025 will operate with a supply voltage from 4V to 36V. Typical supply current is 80µA, resulting in less than 0.1°C internal temperature rise for supply voltages under 10V. A 10mV/°C output is available at low impedance, in addition to the direct thermocouple voltages of 60.9µV/°C (E), 51.7µV/°C (J), 40.3µV/°C (K, T) and 5.95µV/°C (R, S). All outputs are essentially independent of power supply voltage.

A special kit is available (LTK001) which contains an LT1025 and a custom tailored thermocouple amplifier. The amplifier and compensator are matched to allow a much tighter specification of temperature error than would be obtained by adding the compensator and amplifier errors on a worst-case basis. The amplifier from this kit is available separately as LTKA0x.

The LT1025 is available in either an 8-pin PDIP or 8-pin SO package for temperatures between 0°C and 70°C.

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
LT1025ACN8#PBF N-8 N C 05-08-1510 (N8) Yes
LT1025CN8#PBF N-8 N C 05-08-1510 (N8) Yes
LT1025CS8#PBF SO-8 S8 C 05-08-1610 (S8) Yes
LT1025CS8#TRPBF SO-8 S8 C 05-08-1610 (S8) Yes


LT1025 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
LT1025ACN8#PBF N-8 C $5.75 $4.60 Yes
LT1025CN8#PBF N-8 C $3.08 $2.55 Yes
LT1025CS8#PBF SO-8 C $4.21 $2.95 Yes
LT1025CS8#TRPBF SO-8 C $3.01 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

Applications

  • Thermocouple Cold Junction Compensator
  • Centigrade Thermometer
  • Temperature Compensation Network

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Design Tools

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