KTY23-7 Equivalent & Substitute Parts

Part Overview

The KTY23-7 is a PTC thermistor manufactured by Infineon Technologies with a nominal resistance of 1.015 kOhms at 25°C, packaged in SOT-23-3 (TO-236-3, SC-59). This component is classified as obsolete, making equivalent substitutes necessary for ongoing design support and procurement.

The KTY23-7 operates across a wide temperature range of -50°C to 150°C and is designed for surface mount applications requiring thermal sensing or compensation. Due to its obsolete status, identifying functionally compatible alternatives is essential for system continuity and component availability.

Substiute Parts

KTY23-7

Infineon TechnologiesIn Stock: 2289KTY23-7 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 KTY23-7 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.
• Sensor Type and Output: The KTY23-7 functions as a passive PTC thermistor. Substitute parts must provide equivalent thermal sensing capability within the specified operating temperature envelope.
• Operating Temperature Range: Substitutes must support the application's thermal operating window. The KTY23-7 range of -50°C to 150°C establishes the baseline requirement.
• Mounting Type: Surface mount configuration is mandatory for PCB integration compatibility.
• Regulatory Compliance: REACH and RoHS status ensure compliance with environmental and hazardous substance directives.

The substitute parts identified (LM62BIM3/NOPB, LM62BIM3X/NOPB, LM62CIM3X/NOPB, TC1047AVNBTR, TC1047VNBTR) share the SOT-23-3 package and surface mount configuration. However, these are analog temperature sensors with different operating ranges and output characteristics compared to the passive PTC thermistor design of the KTY23-7. Selection must account for circuit-level compatibility and signal conditioning requirements.

Parameter Comparison

Engineering Selection Recommendations

Active Product Status Priority: LM62BIM3X/NOPB, LM62CIM3X/NOPB, TC1047AVNBTR, and TC1047VNBTR all carry active product status, ensuring long-term availability and manufacturing support. LM62BIM3/NOPB and LM62CIM3X/NOPB are obsolete, limiting their suitability for new designs despite current inventory availability.

Regulatory Compliance: All identified substitutes maintain REACH Unaffected status, consistent with the KTY23-7. LM62BIM3X/NOPB, LM62CIM3X/NOPB, TC1047AVNBTR, and TC1047VNBTR are RoHS3 compliant, meeting modern environmental standards.

Temperature Range Considerations: The KTY23-7 operates from -50°C to 150°C. The LM62 series (LM62BIM3/NOPB, LM62BIM3X/NOPB, LM62CIM3X/NOPB) is limited to 0°C to 90°C, which may not cover the full thermal envelope of the original design. The TC1047 series (TC1047AVNBTR, TC1047VNBTR) extends to -40°C to 125°C, providing broader coverage but not matching the full -50°C lower limit.

Circuit Architecture Impact: The KTY23-7 is a passive PTC thermistor requiring external signal conditioning. The LM62 and TC1047 series are active analog temperature sensors with integrated output stages. Direct substitution requires circuit redesign to accommodate the analog voltage output and supply voltage requirements of these alternatives.

Frequently Asked Questions (FAQ)

Q: Can the LM62 series directly replace the KTY23-7 without circuit modification?

A: No. The KTY23-7 is a passive PTC thermistor with resistance-based output, while the LM62 series provides analog voltage output. Circuit redesign is required to interface with the analog output and accommodate the 2.7V to 10V supply voltage requirement.

Q: Which substitute offers the closest temperature range match to the KTY23-7?

A: The TC1047 series (TC1047AVNBTR and TC1047VNBTR) provides the broadest operating range at -40°C to 125°C. However, this does not fully extend to the KTY23-7's -50°C lower limit. The LM62 series is restricted to 0°C to 90°C and is unsuitable for applications requiring the full thermal range of the original component.

Q: Are all substitute parts available in the same SOT-23-3 package?

A: Yes. All identified substitutes use the SOT-23-3 (TO-236-3, SC-59) package, ensuring mechanical compatibility with existing PCB layouts. Packaging variants (Tape & Reel, Bulk, Cut Tape) differ by supplier but do not affect the component footprint.

Q: What is the difference between TC1047AVNBTR and TC1047VNBTR?

A: Both are Microchip TC1047 analog temperature sensors in SOT-23-3 packaging with identical operating temperature range (-40°C to 125°C) and resolution (10mV/°C). The primary difference is supply voltage: TC1047AVNBTR operates at 2.5V to 5.5V, while TC1047VNBTR operates at 2.7V to 4.4V. Selection depends on the available supply voltage in the target application.

Q: Should I prioritize active or obsolete substitute parts?

A: Active product status is strongly preferred for new designs and long-term production. LM62BIM3X/NOPB, LM62CIM3X/NOPB, TC1047AVNBTR, and TC1047VNBTR are all active. Obsolete parts (LM62BIM3/NOPB) should be considered only for legacy system maintenance where design changes are not feasible.

Q: What is the accuracy difference between the LM62 and TC1047 series?

A: LM62BIM3/NOPB and LM62BIM3X/NOPB offer ±2°C accuracy at 25°C (±2.5°C across range). LM62CIM3X/NOPB provides ±3°C accuracy at 25°C (±4°C across range). TC1047AVNBTR and TC1047VNBTR both offer ±2°C accuracy at 25°C (±3°C across range). Selection should align with the thermal measurement precision required by the application.