GS104R1K NTC Thermistor 100kΩ Equivalent & Substitute Parts

Part Overview

The GS104R1K is an NTC thermistor manufactured by Littelfuse Inc., featuring a 100kΩ resistance at 25°C in a glass bead package with 1.00" lead wire length. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing design support and procurement continuity. The GS104R1K operates across a temperature range up to 300°C and is suitable for through-hole mounting applications requiring temperature sensing functionality.

Substiute Parts

GS104R1K

Littelfuse Inc.In Stock: 1099GS104R1K Datasheet

Current PartRFQ

DG104410

AmethermIn Stock: 1380DG104410 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The DG104410 from Ametherm qualifies as a direct substitute for the GS104R1K based on the following critical parameters:

• Resistance Match: Both parts specify 100kΩ at 25°C, meeting the primary electrical requirement
• B-Value Compatibility: The DG104410 B25/85 value of 4263K matches the GS104R1K specification exactly, ensuring thermal response characteristics are equivalent
• Package Compatibility: Both utilize glass bead construction with through-hole mounting, maintaining mechanical and thermal interface compatibility
• Operating Temperature: The DG104410 supports the full 300°C upper limit of the GS104R1K, with extended lower temperature capability (-55°C)
• Tolerance Improvement: The DG104410 offers tighter resistance tolerance (±5% vs ±10%) and includes B-value tolerance specification (±3%), providing enhanced precision

The primary difference is lead wire length: the DG104410 provides 2.56" (65.00mm) versus the GS104R1K's 1.00" (25.40mm). This requires verification against physical layout constraints in the target application.

Parameter Comparison

Engineering Selection Recommendations

The DG104410 is the designated manufacturer-recommended substitute for the GS104R1K. Selection of this part is supported by:

• Product Status: The DG104410 maintains active production status, ensuring long-term availability and supply chain stability compared to the obsolete GS104R1K
• Regulatory Compliance: The DG104410 carries ROHS3 compliance certification, meeting current environmental and material restriction requirements
• Electrical Equivalence: Matching B25/85 thermal coefficient and 100kΩ nominal resistance ensure functional interchangeability in temperature sensing applications
• Enhanced Specifications: Tighter tolerance bands (±5% resistance, ±3% B-value) provide improved measurement accuracy over the original part

Lead wire length must be evaluated against physical installation constraints. If the extended 2.56" length creates routing or space conflicts, alternative lead configurations or mechanical adaptation may be required.

Frequently Asked Questions (FAQ)

Q: Can the DG104410 directly replace the GS104R1K without circuit modifications?

A: Yes, from an electrical standpoint. The matching 100kΩ resistance and identical B25/85 thermal coefficient (4263K) ensure equivalent temperature sensing performance. Physical lead wire length differences must be accommodated through board layout or mechanical design adjustments.

Q: What does the B25/85 value represent, and why is it critical for substitution?

A: The B25/85 value (4263K) defines the thermistor's thermal response between 25°C and 85°C. This parameter directly determines how the component's resistance changes with temperature. Matching B-values between the original and substitute part ensures identical thermal behavior in the application circuit.

Q: Are there tolerance differences that affect circuit performance?

A: The DG104410 provides tighter resistance tolerance (±5% vs ±10%) and includes B-value tolerance specification (±3%). These improvements enhance measurement precision and reduce circuit calibration drift, particularly in temperature-critical applications.

Q: Does the longer lead wire on the DG104410 affect electrical performance?

A: Lead wire length does not affect electrical performance in standard temperature sensing circuits. However, longer leads may introduce slightly higher parasitic inductance in high-frequency applications. Physical installation space and thermal coupling to the measurement point should be evaluated.

Q: Is the DG104410 suitable for high-temperature applications up to 300°C?

A: Yes. The DG104410 is rated for continuous operation up to 300°C, matching the GS104R1K's upper temperature limit. The extended lower temperature range (-55°C) provides additional operational flexibility.

Q: What is the significance of ROHS3 compliance on the DG104410?

A: ROHS3 compliance indicates the part meets current European Union Restriction of Hazardous Substances directives, restricting lead, cadmium, mercury, and other hazardous materials. This certification is required for many industrial and consumer applications and represents a regulatory advantage over the GS104R1K.