KTY136 Equivalent & Substitute Parts

Part Overview

The KTY136 is a PTC thermistor with 2 kOhms nominal resistance at 25°C, manufactured by Infineon Technologies in SOT-23-3 surface mount packaging. This component is discontinued at DiGi Electronics and classified as a legacy product. Finding equivalent or substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or repair requirements for systems utilizing this temperature sensing element.

Substiute Parts

KTY136

Infineon TechnologiesIn Stock: 1196KTY136 Datasheet

Current PartRFQ

LM62BIM3/NOPB

Texas InstrumentsIn Stock: 1485LM62BIM3/NOPB Datasheet

MFR RecommendedRFQ

TC1047VNBTR

Microchip TechnologyIn Stock: 6507TC1047VNBTR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the KTY136 is determined by the following critical parameters:

• Package Compatibility: All substitute parts must use SOT-23-3 (TO-236-3, SC-59) surface mount packaging to ensure mechanical and electrical compatibility with existing PCB layouts and assembly processes.
• Mounting Type: Surface mount technology is mandatory for direct replacement.
• Environmental Compliance: RoHS3 compliance and MSL rating of 1 are required to meet regulatory and manufacturing standards.
• Functional Category: Temperature sensing capability is the primary functional requirement.

The KTY136 is a PTC thermistor with fixed resistance characteristics. Substitute parts identified are analog temperature sensors that provide temperature-dependent output signals, representing a functional shift from passive resistance-based sensing to active analog output sensing. Both substitute parts maintain SOT-23-3 packaging and RoHS3 compliance, enabling direct physical replacement while requiring circuit-level evaluation for functional compatibility.

Parameter Comparison

Engineering Selection Recommendations

LM62BIM3/NOPB (Texas Instruments)

This part is classified as obsolete and carries the same supply chain risk as the KTY136. While it maintains SOT-23-3 packaging and RoHS3 compliance, its operating temperature range (0°C ~ 90°C) is narrower than the KTY136 (-50°C ~ 150°C). Selection of this part is appropriate only when the application temperature range falls entirely within 0°C to 90°C and existing inventory is available.

TC1047VNBTR (Microchip Technology)

This part is classified as active and represents the most viable long-term substitute. It maintains SOT-23-3 packaging, RoHS3 compliance, and MSL rating of 1. The operating temperature range (-40°C ~ 125°C) covers most of the KTY136 range except for the extreme low temperature (-50°C) and high temperature (150°C) extremes. This part is suitable for applications where the full -50°C to 150°C range is not required.

Selection between these substitutes depends on application-specific temperature requirements and supply chain availability. The TC1047VNBTR is preferred for new designs due to its active product status.

Frequently Asked Questions (FAQ)

Q: Can the LM62BIM3/NOPB or TC1047VNBTR be used as direct pin-for-pin replacements for the KTY136?

A: Yes, both parts share identical SOT-23-3 packaging and pinout compatibility. However, functional compatibility requires circuit-level evaluation. The KTY136 is a passive PTC thermistor, while the substitutes are active analog temperature sensors with voltage output. The application circuit must support analog voltage sensing rather than resistance measurement.

Q: What is the temperature range limitation when using TC1047VNBTR as a substitute?

A: The TC1047VNBTR operates from -40°C to 125°C, which does not cover the KTY136's full range of -50°C to 150°C. Applications requiring operation below -40°C or above 125°C cannot use this substitute without design modification or supplementary components.

Q: Are both substitute parts RoHS3 compliant?

A: Yes, both LM62BIM3/NOPB and TC1047VNBTR are RoHS3 compliant with MSL rating of 1 (unlimited moisture sensitivity level), matching the KTY136's environmental compliance profile.

Q: Which substitute part should be selected for new designs?

A: The TC1047VNBTR is the recommended choice for new designs due to its active product status. The LM62BIM3/NOPB is obsolete and presents long-term supply chain risk.

Q: Do the substitute parts require different supply voltage than the KTY136?

A: Yes. The KTY136 is a passive component requiring no external power supply. The LM62BIM3/NOPB requires 2.7V to 10V supply, and the TC1047VNBTR requires 2.7V to 4.4V supply. Circuit design must accommodate these power requirements.