104JM2B NTC Thermistor Equivalent & Substitute Parts

Part Overview

The 104JM2B is an NTC thermistor manufactured by Littelfuse Inc., rated at 100kΩ resistance at 25°C with a B value of 3892K. This component operates across a wide temperature range from -55°C to 300°C and is packaged in the DO-204AH/DO-35 axial configuration for through-hole mounting. The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and component procurement.

Substiute Parts

104JM2B

Littelfuse Inc.In Stock: 793104JM2B Datasheet

Current PartRFQ

135-104LAF-J01

Honeywell Sensing and Productivity SolutionsIn Stock: 1534135-104LAF-J01 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 104JM2B is determined by the following critical parameters:

• Resistance value at 25°C: 100kΩ (exact match required)
• Resistance tolerance: ±5% (acceptable range for thermal sensing applications)
• Package configuration: DO-204AH/DO-35 axial (physical and electrical compatibility)
• Mounting type: Through-hole (PCB integration compatibility)
• Operating temperature range: Minimum -55°C to 300°C coverage
• B value characteristics: Thermal response curve compatibility within acceptable deviation

The 135-104LAF-J01 from Honeywell Sensing and Productivity Solutions meets all substitution criteria as a manufacturer-recommended equivalent.

Parameter Comparison

Engineering Selection Recommendations

The 135-104LAF-J01 is the designated manufacturer-recommended substitute for the obsolete 104JM2B. Both components share identical electrical specifications (100kΩ at 25°C, ±5% tolerance) and physical packaging (DO-204AH/DO-35 axial through-hole). The Honeywell part provides an extended minimum operating temperature of -60°C compared to -55°C for the Littelfuse original, ensuring compatibility across the full specified range. Both components maintain equivalent RoHS and REACH compliance status, with MSL ratings of 1 (Unlimited) for moisture sensitivity. The 135-104LAF-J01 is currently in active production with confirmed inventory availability, eliminating supply chain risk associated with the obsolete 104JM2B.

Frequently Asked Questions (FAQ)

Q: Can the 135-104LAF-J01 be used as a direct replacement for the 104JM2B?

A: Yes. Both components have identical resistance values (100kΩ), tolerance specifications (±5%), package configurations (DO-204AH/DO-35 axial), and mounting types (through-hole). The Honeywell part is the manufacturer-recommended equivalent.

Q: What is the difference in B value between these thermistors?

A: The 104JM2B specifies B0/50 = 3892K, while the 135-104LAF-J01 specifies B25/85 = 3974K. These represent different measurement reference points but indicate comparable thermal response characteristics suitable for equivalent thermal sensing applications.

Q: Are there any temperature range limitations when substituting?

A: No. The 135-104LAF-J01 operates from -60°C to 300°C, which exceeds the original 104JM2B range of -55°C to 300°C. Full compatibility is maintained across all specified operating conditions.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the 104JM2B and 135-104LAF-J01 are RoHS compliant, REACH unaffected, and carry MSL rating 1 (Unlimited). Compliance requirements are equivalent.

Q: Is the 135-104LAF-J01 currently available?

A: Yes. The 135-104LAF-J01 is in active production status with confirmed inventory availability, unlike the obsolete 104JM2B.