KT230 PTC Thermistor Equivalent & Substitute Parts

Part Overview

The KT230 is a PTC thermistor manufactured by Infineon Technologies with a nominal resistance of 1 kOhm at 25°C and ±3% tolerance. Packaged in SOT-23-3 (TO-236-3, SC-59), this surface-mount temperature sensor operates across -50°C to 150°C. The product is currently obsolete, making equivalent substitutes necessary for ongoing design support, maintenance, and new production requirements. Substitute parts must maintain mechanical compatibility with the SOT-23-3 package and provide equivalent thermal sensing functionality within specified operating ranges.

Substiute Parts

KT230

Infineon TechnologiesIn Stock: 4426KT230 Datasheet

Current PartRFQ

LM62BIM3/NOPB

Texas InstrumentsIn Stock: 1485LM62BIM3/NOPB Datasheet

MFR RecommendedRFQ

LM62BIM3X/NOPB

National SemiconductorIn Stock: 2665LM62BIM3X/NOPB Datasheet

MFR RecommendedRFQ

LM62CIM3X/NOPB

Texas InstrumentsIn Stock: 738LM62CIM3X/NOPB Datasheet

MFR RecommendedRFQ

TC1047AVNBTR

Microchip TechnologyIn Stock: 38220TC1047AVNBTR Datasheet

MFR RecommendedRFQ

TC1047VNBTR

Microchip TechnologyIn Stock: 6507TC1047VNBTR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the KT230 is determined by the following critical parameters:

Mechanical Compatibility: All substitute parts must use the SOT-23-3 package (TO-236-3, SC-59) to ensure direct pin-compatible replacement on existing PCBs.

Sensor Type & Function: The KT230 is a PTC thermistor. Substitute parts identified are analog temperature sensors with local sensing capability, which provide equivalent thermal monitoring functionality through different output mechanisms (analog voltage output vs. resistance change).

Operating Temperature Range: The KT230 operates from -50°C to 150°C. Substitute parts must cover this range or provide overlap within critical application temperatures.

Thermal Characteristics: Substitute parts are selected based on output resolution (mV/°C), accuracy specifications, and supply voltage compatibility to ensure functional equivalence in temperature measurement applications.

Compliance & Status: All substitute parts maintain REACH compliance and MSL-1 rating, ensuring regulatory and environmental compatibility.

Parameter Comparison

Engineering Selection Recommendations

For Temperature Range -50°C to 0°C: The LM62 series (LM62BIM3/NOPB, LM62BIM3X/NOPB, LM62CIM3X/NOPB) does not cover temperatures below 0°C. The TC1047 series (TC1047AVNBTR, TC1047VNBTR) extends operation to -40°C, providing partial coverage of the KT230 range. Neither substitute fully covers the KT230's lower temperature limit of -50°C.

For Temperature Range 0°C to 90°C: All substitute parts operate within this range. LM62 series parts provide 15.6mV/°C resolution with ±2°C to ±3°C accuracy. TC1047 series parts provide 10mV/°C resolution with ±2°C to ±3°C accuracy.

For Temperature Range 90°C to 125°C: Only TC1047AVNBTR and TC1047VNBTR extend operation to 125°C, providing coverage above the LM62 series limit of 90°C.

For Temperature Range 125°C to 150°C: No substitute part covers the KT230's upper temperature limit of 150°C. Applications requiring operation above 125°C cannot use these substitutes.

Product Status Consideration: LM62BIM3X/NOPB, LM62CIM3X/NOPB, TC1047AVNBTR, and TC1047VNBTR are active products with ongoing manufacturer support. LM62BIM3/NOPB is obsolete, similar to the KT230.

Compliance: All substitute parts maintain REACH compliance and MSL-1 rating, ensuring regulatory equivalence.

Frequently Asked Questions (FAQ)

Q: Can the KT230 be directly replaced with any of these substitute parts?

A: Direct replacement depends on application temperature requirements. All substitutes use the same SOT-23-3 package and are pin-compatible. However, operating temperature ranges differ. Applications operating within 0°C to 90°C can use LM62 series parts. Applications requiring -40°C to 125°C operation can use TC1047 series parts. Applications requiring operation below -40°C or above 125°C cannot use these substitutes.

Q: What is the key difference between the KT230 and the substitute parts?

A: The KT230 is a PTC thermistor that changes resistance with temperature. The substitute parts are analog temperature sensors that output a proportional voltage. Circuit design must accommodate this functional difference in signal conditioning and measurement.

Q: Are all substitute parts pin-compatible with the KT230?

A: Yes. All substitute parts use the SOT-23-3 package (TO-236-3, SC-59) with identical pin configuration, enabling direct PCB replacement.

Q: Which substitute part has the widest operating temperature range?

A: TC1047AVNBTR and TC1047VNBTR both operate from -40°C to 125°C, the widest range among substitutes. However, this does not cover the KT230's full -50°C to 150°C range.

Q: What is the difference between TC1047AVNBTR and TC1047VNBTR?

A: Both parts have identical operating temperature range (-40°C to 125°C), package, and accuracy specifications. The primary difference is supply voltage range: TC1047AVNBTR operates at 2.5V to 5.5V, while TC1047VNBTR operates at 2.7V to 4.4V.

Q: Are there differences in accuracy between substitute parts?

A: LM62BIM3/NOPB and LM62BIM3X/NOPB provide ±2°C accuracy at 25°C. LM62CIM3X/NOPB provides ±3°C accuracy at 25°C. TC1047AVNBTR and TC1047VNBTR provide ±2°C accuracy at 25°C. All parts maintain higher accuracy tolerances at temperature extremes.

Q: Can I use LM62 series parts in applications requiring operation above 90°C?

A: No. LM62 series parts are specified only to 90°C. TC1047 series parts extend operation to 125°C and should be used for higher temperature applications.

Q: What packaging options are available for these substitute parts?

A: LM62BIM3/NOPB is supplied in Tape & Reel (TR). LM62BIM3X/NOPB is supplied in Bulk. LM62CIM3X/NOPB is supplied in Tape & Reel (TR). TC1047AVNBTR and TC1047VNBTR are supplied in Cut Tape (CT) & Digi-Reel®.