KX103G2 Equivalent & Substitute Parts

Part Overview

The KX103G2 is an NTC thermistor manufactured by Littelfuse Inc., featuring a 10kΩ resistance at 25°C with a B value of 3575K. This component is classified as a temperature sensor in bead form with epoxy packaging and free-hanging mounting configuration. The KX103G2 is currently listed as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and component procurement.

Substiute Parts

KX103G2

Littelfuse Inc.In Stock: 1211KX103G2 Datasheet

Current PartRFQ

701006

TE Connectivity Measurement SpecialtiesIn Stock: 2897701006 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the KX103G2 is determined by the following critical parameters:

• Resistance Value: 10kΩ at 25°C (primary selection criterion)
• B Value: Nominal 3575K (thermal characteristic matching)
• Package Configuration: Bead form with free-hanging mounting
• Compliance Standards: ROHS3 compliance and REACH unaffected status
• Operating Temperature: Minimum capability to support the original 120°C upper limit

The substitute part 701006 meets these criteria with a B value of 3574K (within 1K of the original), matching resistance tolerance specifications, and extended operating temperature range of -55°C to 150°C, providing superior thermal coverage.

Parameter Comparison

Engineering Selection Recommendations

The 701006 from TE Connectivity Measurement Specialties is the designated manufacturer-recommended substitute for the obsolete KX103G2. Both components maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment. The 701006 offers improved resistance tolerance (±0.2°C versus ±1°C) and an extended operating temperature range (-55°C to 150°C versus 120°C maximum), providing enhanced performance margins for thermal sensing applications. The B value differential of 1K (3574K versus 3575K) is negligible for practical thermistor applications. Lead wire length differs (76.20mm versus 38.00mm), requiring mechanical integration assessment in the target application.

Frequently Asked Questions (FAQ)

Q: Can the 701006 directly replace the KX103G2 in all applications?

A: The 701006 is electrically and thermally equivalent based on resistance value and B value specifications. Mechanical integration must be evaluated due to the longer lead wire length (76.20mm versus 38.00mm). Verify mounting clearance and lead routing in your specific application.

Q: What is the significance of the B value difference between 3575K and 3574K?

A: The 1K difference represents a 0.03% variance and is within normal manufacturing tolerances for NTC thermistors. This difference is negligible for temperature sensing applications and does not affect functional compatibility.

Q: Why does the 701006 have a wider operating temperature range?

A: The 701006 is specified for -55°C to 150°C operation, exceeding the KX103G2 specification of 120°C maximum. This extended range reflects the design and qualification of the TE Connectivity component and provides additional thermal margin for system operation.

Q: Are there compliance differences between the two parts?

A: Both components are ROHS3 compliant and REACH unaffected. No compliance barriers exist for substitution from a regulatory standpoint.

Q: What should I consider regarding the different lead wire lengths?

A: The 701006 provides 76.20mm leads compared to 38.00mm on the KX103G2. Assess your application's mechanical layout, including lead routing, strain relief, and mounting fixture compatibility. Longer leads may require adjustment to mounting hardware or circuit board layout.