LC103G2K NTC Thermistor 10kΩ Equivalent & Substitute Parts

Part Overview

The LC103G2K is an NTC thermistor manufactured by Littelfuse Inc., featuring a 10kΩ resistance at 25°C with a B0/50 value of 3575K. This component is classified as obsolete, making equivalent substitutes necessary for ongoing applications and new designs. The thermistor is packaged as an epoxy bead with free-hanging leads, suitable for temperature sensing applications requiring negative temperature coefficient characteristics.

Substiute Parts

LC103G2K

Littelfuse Inc.In Stock: 1051LC103G2K Datasheet

Current PartRFQ

701006

TE Connectivity Measurement SpecialtiesIn Stock: 2897701006 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LC103G2K is determined by the following critical parameters:

• Resistance Value: 10kΩ at 25°C (primary selection criterion)
• B Value Range: B0/50 within acceptable thermal response tolerance (3574K–3575K range)
• Package Configuration: Bead form factor with free-hanging leads
• Operating Temperature Range: Minimum 150°C upper limit
• Compliance Standards: ROHS3 compliance and REACH unaffected status

The substitute part 701006 meets these criteria with matching 10kΩ resistance, comparable B0/50 value (3574K), identical package type, and extended operating temperature range (-55°C to 150°C).

Parameter Comparison

Engineering Selection Recommendations

The 701006 from TE Connectivity Measurement Specialties is the qualified substitute for the obsolete LC103G2K. Selection is based on:

• Functional Equivalence: Identical 10kΩ resistance value with B0/50 thermal coefficient within 0.03% variance (3574K vs. 3575K)
• Active Product Status: The 701006 is currently in active production, ensuring long-term availability and supply chain continuity
• Regulatory Compliance: Both components maintain ROHS3 compliance and REACH unaffected status, meeting current environmental and safety standards
• Temperature Performance: The 701006 extends the lower operating limit to -55°C while maintaining the 150°C upper specification, providing broader application flexibility
• Physical Compatibility: Both components use identical bead package configuration with free-hanging leads; lead length difference (38mm vs. 76mm) must be evaluated for specific mechanical constraints

Frequently Asked Questions (FAQ)

Q: Can the 701006 directly replace the LC103G2K in existing designs?

A: Yes, the 701006 is functionally equivalent for temperature sensing applications. The primary consideration is lead length: the 701006 provides 76.20mm leads versus the LC103G2K's 38.00mm leads. Mechanical routing and mounting geometry must be verified for your specific application.

Q: What is the significance of the B0/50 value in thermistor selection?

A: The B0/50 value (3575K for LC103G2K, 3574K for 701006) defines the thermistor's thermal response curve. The 0.03% difference between these values is negligible for most temperature sensing applications and falls within normal manufacturing tolerance ranges.

Q: Why is the LC103G2K listed as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. The 701006 substitute ensures continued availability for replacement and new production requirements.

Q: Are there compliance differences between the two parts?

A: No. Both components are ROHS3 compliant and REACH unaffected, meeting identical regulatory requirements for electronic component use in current markets.

Q: Does the extended temperature range of the 701006 affect compatibility?

A: The 701006's extended lower operating limit (-55°C vs. unspecified for LC103G2K) provides additional capability without compromising the 150°C upper limit. This represents an enhancement rather than a limitation for substitution purposes.