PX104R2 Equivalent & Substitute Parts

Part Overview

The PX104R2 is an NTC thermistor manufactured by Littelfuse Inc., featuring a 100kΩ resistance at 25°C with a B value of 4140K. This component is designed for temperature sensing applications requiring a bead-type epoxy package with free-hanging mounting. The PX104R2 is classified as obsolete, making identification of suitable substitute components essential for ongoing design support and production continuity. Equivalent parts must maintain the same electrical characteristics and physical form factor to ensure direct replacement capability.

Substiute Parts

PX104R2

Littelfuse Inc.In Stock: 895PX104R2 Datasheet

Current PartRFQ

192-104QET-A01

Honeywell Sensing and Productivity SolutionsIn Stock: 4379192-104QET-A01 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PX104R2 is based on the following critical parameters:

• Resistance Value: 100kΩ at 25°C (exact match required)
• B Value: Nominal 4140K (tolerance range acceptable within ±2.1%)
• Lead Wire Length: 1.50" (38.00mm) (physical compatibility)
• Package Configuration: Bead form factor with compatible epoxy or equivalent encapsulation
• Operating Temperature: Minimum capability of 120°C
• Compliance Standards: RoHS and REACH compliance maintained

The 192-104QET-A01 from Honeywell Sensing and Productivity Solutions meets these substitution criteria with a B value of 4138K, which falls within acceptable tolerance of the original specification.

Parameter Comparison

Engineering Selection Recommendations

The 192-104QET-A01 is suitable as a substitute for the PX104R2 based on the following factors:

• Electrical Equivalence: Both components share identical 100kΩ resistance at 25°C. The B value difference of 2K (4140K vs. 4138K) represents a 0.05% variance, which is negligible for most temperature sensing applications.
• Physical Compatibility: Lead wire length matches exactly at 1.50" (38.00mm), ensuring mechanical fit in existing designs.
• Compliance: Both components maintain RoHS and REACH compliance, satisfying regulatory requirements.
• Product Availability: The 192-104QET-A01 is classified as active with 4343 units in stock, providing reliable supply continuity compared to the obsolete PX104R2.
• Operating Range: The Honeywell substitute provides an extended operating temperature range (-60°C to 150°C) compared to the original specification (up to 120°C), offering additional design margin.

Frequently Asked Questions (FAQ)

Q: Can the 192-104QET-A01 be used as a direct replacement for the PX104R2?

A: Yes. Both components have identical 100kΩ resistance at 25°C and matching lead wire lengths. The B value difference of 2K is within acceptable tolerance for thermistor applications. Compliance certifications are maintained.

Q: What is the significance of the B value difference between 4140K and 4138K?

A: The B value determines the thermistor's temperature sensitivity. A 2K difference represents 0.05% variance and is negligible for most temperature measurement applications. The tolerance specification of ±2.1% for the substitute part accommodates this minor difference.

Q: Are there differences in mounting type between these components?

A: The PX104R2 is specified for free-hanging mounting, while the 192-104QET-A01 is rated for through-hole mounting. Both configurations use identical lead wire lengths and bead packages, allowing mechanical compatibility in most applications. Verify mounting requirements for your specific circuit design.

Q: Does the extended operating temperature range of the substitute affect compatibility?

A: No. The 192-104QET-A01 operates from -60°C to 150°C, which encompasses the original PX104R2 specification of up to 120°C. The extended range provides additional design margin without compromising compatibility.

Q: Are both components RoHS and REACH compliant?

A: Yes. The PX104R2 is ROHS3 compliant and REACH unaffected. The 192-104QET-A01 is RoHS compliant and REACH unaffected. Both meet current regulatory requirements for electronic component use.