GS103E1K Equivalent & Substitute Parts

Part Overview

The GS103E1K is an NTC thermistor with 10kΩ resistance at 25°C, manufactured by Littelfuse Inc. in a glass bead package with through-hole mounting. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing design support and production continuity. The GS103E1K operates up to 300°C and features a B25/85 value of 3435K with ±10% resistance tolerance.

Substiute Parts

GS103E1K

Littelfuse Inc.In Stock: 1005GS103E1K Datasheet

Current PartRFQ

B57541G1303H5

EPCOS - TDK ElectronicsIn Stock: 922B57541G1303H5 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the GS103E1K is determined by the following critical parameters:

• Resistance Value: 10kΩ at 25°C (primary electrical specification)
• B-Value Characteristics: B25/85 thermal coefficient determines temperature response curve
• Package Configuration: Glass bead with through-hole mounting ensures mechanical compatibility
• Operating Temperature Range: Maximum rated temperature capability
• Resistance Tolerance: Acceptable deviation from nominal 10kΩ value

The B57541G1303H5 qualifies as a substitute based on matching the 10kΩ resistance specification and glass bead package. The B25/85 value of 3478K is within acceptable thermal response parameters for NTC thermistor applications where the GS103E1K was specified.

Parameter Comparison

Engineering Selection Recommendations

The B57541G1303H5 is an active product from EPCOS - TDK Electronics and serves as the manufacturer-recommended substitute for the obsolete GS103E1K. Both components share identical 10kΩ resistance specifications and glass bead package configurations suitable for through-hole assembly.

The B57541G1303H5 offers improved resistance tolerance (±3% versus ±10%), providing tighter electrical performance. The B25/85 thermal coefficient of 3478K is comparable to the GS103E1K's 3435K value, maintaining similar temperature response characteristics across the operating range.

The maximum operating temperature of the B57541G1303H5 is 250°C, which is lower than the GS103E1K's 300°C rating. Applications requiring operation above 250°C cannot use this substitute. The lead wire length differs by 3.90mm (0.85" versus 1.00"), which may require mechanical layout verification in space-constrained applications.

The B57541G1303H5 carries ROHS3 compliance and REACH Unaffected status, meeting current regulatory requirements for new designs and production.

Frequently Asked Questions (FAQ)

Q: Can the B57541G1303H5 replace the GS103E1K in all applications?

A: The B57541G1303H5 is suitable for applications operating at or below 250°C. If your application requires operation above 250°C, this substitute is not appropriate. Both components share the same 10kΩ resistance and glass bead package, making them mechanically and electrically compatible within the B57541G1303H5's temperature limits.

Q: What is the significance of the B25/85 value difference (3435K vs 3478K)?

A: The B-value defines the NTC thermistor's temperature response curve. The 43K difference between 3435K and 3478K represents a minor variation in thermal sensitivity. For most temperature sensing applications, this difference is within acceptable tolerance and does not significantly alter the component's performance characteristics.

Q: Does the shorter lead wire length (0.85" vs 1.00") affect compatibility?

A: Lead wire length is a mechanical consideration for PCB layout and assembly. The 3.90mm difference may require verification in applications with tight spacing constraints or specific lead positioning requirements. Electrical performance is not affected by this dimensional difference.

Q: Why is the GS103E1K classified as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. The B57541G1303H5 is the active equivalent, ensuring continued availability and supply chain reliability for new and ongoing production requirements.

Q: Are there compliance differences between these parts?

A: The B57541G1303H5 is ROHS3 compliant, meeting current environmental regulations. Both components are REACH Unaffected. For new designs and production, the B57541G1303H5's compliance status aligns with modern regulatory requirements.