GS302J1K NTC Thermistor Equivalent & Substitute Parts

Part Overview

The GS302J1K is an NTC thermistor manufactured by Littelfuse Inc., designed as a temperature sensing component in a glass bead package. This part features a nominal resistance of 3kΩ at 25°C with a B-value of 3892K (B0/50) and operates up to 300°C. The product is currently classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing applications and new designs requiring similar thermal characteristics.

Substiute Parts

GS302J1K

Littelfuse Inc.In Stock: 1180GS302J1K Datasheet

Current PartRFQ

701030

TE Connectivity Measurement SpecialtiesIn Stock: 1128701030 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the GS302J1K is determined by the following critical parameters:

• Resistance Value: 3kΩ nominal at 25°C
• B-Value Characteristics: B0/50 and B25/85 values must fall within acceptable thermal response tolerances
• Package Configuration: Glass bead thermistor form factor
• Operating Temperature Range: Compatibility with the application's thermal environment
• Resistance Tolerance: Acceptable deviation from nominal value

The substitute part 701030 (TE Connectivity Measurement Specialties) meets the core electrical requirements with matching 3kΩ resistance at 25°C and comparable B-value parameters (B0/50: 3891K, B25/85: 3976K). Both components utilize glass bead packaging and are suitable for through-hole thermal sensing applications.

Parameter Comparison

Engineering Selection Recommendations

The 701030 from TE Connectivity Measurement Specialties is an active product suitable for replacing the obsolete GS302J1K in applications requiring 3kΩ NTC thermistor functionality. Both components share identical ECCN (EAR99) and HTSUS classifications, confirming regulatory alignment.

Key considerations for selection:

• Electrical Equivalence: Matching 3kΩ resistance and near-identical B-values (difference of 1K in B0/50 and B25/85) ensure thermal response compatibility
• Product Status: The 701030 is actively manufactured and stocked, providing supply continuity
• Physical Differences: The 701030 features extended lead wire length (3.00" vs. 1.00") and free-hanging mounting configuration, requiring mechanical design accommodation
• Compliance: Both components are ROHS3 compliant (701030) or REACH Unaffected (GS302J1K), suitable for regulated applications

Frequently Asked Questions (FAQ)

Q: Can the 701030 directly replace the GS302J1K without circuit modifications?

A: Electrical substitution is valid due to matching 3kΩ resistance and comparable B-values. Physical integration requires accommodation of the longer lead wire (3.00" vs. 1.00") and free-hanging mounting configuration.

Q: What is the significance of the B-value difference between the two parts?

A: The B0/50 values differ by 1K (3892K vs. 3891K) and B25/85 values by 1K (3977K vs. 3976K). This represents a negligible thermal response variance for most temperature sensing applications.

Q: Are there any compliance or certification differences?

A: Both components share identical ECCN and HTSUS classifications. The 701030 is ROHS3 compliant, while the GS302J1K is REACH Unaffected. Verify compliance requirements for your specific application.

Q: What mounting considerations apply when using the 701030?

A: The 701030 is configured for free-hanging installation with extended leads. Applications originally designed for through-hole mounting with shorter leads require mechanical redesign or lead trimming.

Q: Is the resistance tolerance difference significant?

A: The GS302J1K specifies ±10% tolerance, while the 701030 specifies ±0.1°C tolerance. The 701030 offers tighter tolerance control, which may improve thermal measurement accuracy in precision applications.