KT502J2 Equivalent & Substitute Parts

Part Overview

The KT502J2 is an NTC thermistor manufactured by Littelfuse Inc., featuring a 5kΩ resistance at 25°C with a B value of 3892K. This component is classified as a temperature sensor in bead form with epoxy packaging and is rated for a maximum operating temperature of 120°C and 30mW power dissipation. The KT502J2 has reached obsolete product status, necessitating identification of functionally equivalent alternatives for ongoing applications and new designs.

Substiute Parts

KT502J2

Littelfuse Inc.In Stock: 918KT502J2 Datasheet

Current PartRFQ

2152723505

MolexIn Stock: 31292152723505 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The Molex part number 2152723505 qualifies as a manufacturer-recommended substitute based on the following critical parameters:

• Resistance Match: Both parts specify 5kΩ at 25°C
• B Value Match: Both parts specify B0/50 of 3892K, ensuring equivalent thermal response characteristics
• Package Compatibility: Both utilize epoxy bead construction suitable for temperature sensing applications
• Compliance Alignment: Both are ROHS3 compliant and share the same HTSUS classification (8533.40.8070)
• Regulatory Status: Both are classified under ECCN EAR99

The 2152723505 maintains functional equivalence while offering an active product status and expanded operating temperature range (-40°C to 135°C versus 120°C maximum for the KT502J2).

Parameter Comparison

Engineering Selection Recommendations

The 2152723505 is the manufacturer-recommended substitute for the obsolete KT502J2. Both components maintain identical resistance and B value specifications, ensuring thermal response equivalence in temperature sensing applications. The substitute part offers the advantage of active product status with expanded availability and an extended operating temperature range of -40°C to 135°C, providing greater operational flexibility compared to the original 120°C maximum.

Both parts satisfy ROHS3 compliance requirements and share identical ECCN and HTSUS classifications, supporting regulatory and supply chain continuity. The lead wire length difference (1.30" versus 1.50") and mounting type variation (Through Hole versus Free Hanging) require mechanical integration assessment within the specific application context.

Frequently Asked Questions (FAQ)

Q: What makes the 2152723505 a valid substitute for the KT502J2?

A: The 2152723505 matches the critical electrical parameters: 5kΩ resistance at 25°C and 3892K B value. Both components are epoxy bead thermistors with identical thermal response characteristics and regulatory compliance status.

Q: Are there differences in lead wire length between these parts?

A: Yes. The KT502J2 features 1.50" (38.00mm) lead wire length, while the 2152723505 provides 1.30" (33.00mm). Physical layout and circuit board routing must accommodate this 5mm difference.

Q: What is the difference between Free Hanging and Through Hole mounting?

A: Free Hanging mounting allows the component to be suspended without mechanical support, while Through Hole mounting requires insertion into circuit board holes. Application design determines which mounting type is appropriate.

Q: Does the extended operating temperature range of the 2152723505 affect compatibility?

A: The 2152723505 operating range of -40°C to 135°C encompasses the original KT502J2 specification of 120°C maximum. This extended range provides additional operational margin without compromising compatibility in applications limited to the original temperature specification.

Q: Are both parts RoHS compliant?

A: Yes. Both the KT502J2 and 2152723505 are ROHS3 compliant, supporting regulatory requirements for electronic component procurement and assembly.