KTY135 PTC Thermistor - Equivalent & Substitute Parts

Part Overview

The KTY135 is a PTC thermistor manufactured by Infineon Technologies with a nominal resistance of 1.97 kOhms at 25°C, packaged in SOT-23-3 (TO-236-3, SC-59). Designed for surface mount applications, this component operates across a wide temperature range of -50°C to 150°C with ±3% resistance tolerance and MSL 1 moisture sensitivity rating.

The KTY135 is classified as obsolete. Locating equivalent substitute parts is necessary to support ongoing production, maintenance, and design continuity for systems currently utilizing this component. Substitute parts must maintain mechanical compatibility (SOT-23-3 package), electrical performance within acceptable operating parameters, and equivalent reliability certifications.

Substiute Parts

KTY135

Infineon TechnologiesIn Stock: 801KTY135 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

Substitute parts for the KTY135 are identified based on the following critical parameters:

Mechanical Compatibility: All substitute parts must use the SOT-23-3 package (TO-236-3, SC-59) to ensure direct PCB footprint compatibility without layout modifications.

Functional Category: Substitute parts are temperature sensors with analog output characteristics, maintaining the thermal sensing function of the original component.

Operating Temperature Range: The KTY135 operates from -50°C to 150°C. Substitute parts must support temperature ranges that encompass or substantially overlap this specification to ensure functional equivalence in target applications.

Electrical Interface: All substitute parts provide analog voltage output, compatible with standard analog signal conditioning and measurement circuits.

Regulatory Compliance: All substitute parts maintain REACH Unaffected status and EAR99 ECCN classification, ensuring equivalent export and environmental compliance.

Moisture Sensitivity: All substitute parts carry MSL 1 rating, matching the KTY135's unlimited moisture sensitivity level.

Parameter Comparison

Engineering Selection Recommendations

Active Status Preference: LM62BIM3X/NOPB, LM62CIM3X/NOPB, TC1047AVNBTR, and TC1047VNBTR carry Active product status, ensuring continued manufacturer support, availability, and supply chain stability compared to obsolete alternatives.

Temperature Range Considerations: The LM62 series (LM62BIM3/NOPB, LM62BIM3X/NOPB, LM62CIM3X/NOPB) operate within 0°C to 90°C, providing a narrower range than the KTY135. The TC1047 series (TC1047AVNBTR, TC1047VNBTR) operate within -40°C to 125°C, offering extended low-temperature capability and approaching the KTY135's upper temperature limit.

Compliance Alignment: All substitute parts maintain EAR99 ECCN and REACH Unaffected status, ensuring regulatory equivalence. MSL 1 rating is confirmed for all parts except LM62BIM3X/NOPB, where MSL status is not specified in available documentation.

Package Compatibility: All substitute parts use SOT-23-3 packaging, ensuring direct mechanical and electrical compatibility with existing PCB layouts designed for the KTY135.

Frequently Asked Questions (FAQ)

Q: Can the LM62 series directly replace the KTY135 in all applications?

A: The LM62 series provides SOT-23-3 package compatibility and analog output functionality. However, the LM62 operating temperature range (0°C to 90°C) is narrower than the KTY135 (-50°C to 150°C). Applications requiring operation below 0°C or above 90°C require evaluation of the TC1047 series instead.

Q: What is the primary functional difference between the KTY135 and the LM62/TC1047 substitutes?

A: The KTY135 is a PTC thermistor providing resistance-based temperature sensing. The LM62 and TC1047 are analog temperature sensors providing voltage output. Circuit interface modifications may be required to accommodate the output type change.

Q: Are the LM62BIM3/NOPB and LM62BIM3X/NOPB interchangeable?

A: Both parts share identical electrical specifications (0°C to 90°C, 15.6mV/°C, ±2°C accuracy at 25°C). The primary difference is product status: LM62BIM3/NOPB is Obsolete, while LM62BIM3X/NOPB is Active. For new designs and ongoing production, LM62BIM3X/NOPB is preferred.

Q: Which substitute offers the widest operating temperature range?

A: The TC1047AVNBTR and TC1047VNBTR both operate from -40°C to 125°C, providing the broadest temperature coverage among available substitutes. These parts approach the KTY135's upper temperature limit of 150°C but do not fully match the lower limit of -50°C.

Q: What is the difference between TC1047AVNBTR and TC1047VNBTR?

A: Both parts share identical temperature range (-40°C to 125°C), resolution (10mV/°C), and accuracy specifications (±2°C at 25°C). The primary difference is supply voltage range: TC1047AVNBTR operates at 2.5V to 5.5V, while TC1047VNBTR operates at 2.7V to 4.4V. Select based on available supply voltage in the target application.

Q: Are all substitute parts RoHS compliant?

A: RoHS compliance is confirmed for LM62BIM3/NOPB (ROHS3), LM62CIM3X/NOPB (ROHS3), TC1047AVNBTR (ROHS3), and TC1047VNBTR (ROHS3). LM62BIM3X/NOPB RoHS status is not specified in available documentation.