LR104R0J NTC Thermistor 100kΩ 1206 Equivalent & Substitute Parts

Part Overview

The LR104R0J is an NTC thermistor manufactured by Littelfuse Inc., designed for temperature sensing applications requiring a 100kΩ resistance at 25°C with a B25/85 value of 4250K. This component is packaged in the 1206 (3216 Metric) surface mount format and operates across the temperature range of -40°C to 125°C. The part is currently listed as obsolete, making identification of equivalent and substitute components essential for ongoing production and maintenance applications.

Substiute Parts

LR104R0J

Littelfuse Inc.In Stock: 876LR104R0J Datasheet

Current PartRFQ

NHQ104B425T5

Amphenol ThermometricsIn Stock: 1190NHQ104B425T5 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LR104R0J is determined by strict equivalence across the following electrical and mechanical parameters:

• Resistance value: 100kΩ at 25°C
• Resistance tolerance: ±5%
• B25/85 thermal coefficient: 4250K
• Operating temperature range: -40°C to 125°C
• Package format: 1206 (3216 Metric) surface mount
• Moisture sensitivity level: 1 (Unlimited)

The NHQ104B425T5 from Amphenol Thermometrics meets all these criteria and qualifies as a direct electrical and mechanical substitute for the obsolete LR104R0J.

Parameter Comparison

Engineering Selection Recommendations

The NHQ104B425T5 is the qualified substitute for the obsolete LR104R0J. Selection is based on:

• Identical electrical specifications: 100kΩ resistance, ±5% tolerance, and 4250K B25/85 value
• Matching mechanical form factor: 1206 (3216 Metric) surface mount package
• Equivalent operating temperature range: -40°C to 125°C
• Active product status: The NHQ104B425T5 is currently in production, ensuring long-term availability
• Compliance alignment: Both components carry ECCN EAR99 classification and HTSUS code 8533.40.8070

Note: The NHQ104B425T5 is supplied in Tape & Reel (TR) packaging format, which is standard for high-volume surface mount assembly operations.

Frequently Asked Questions (FAQ)

Q: Can the NHQ104B425T5 be used as a direct replacement for the LR104R0J in existing designs?

A: Yes. The NHQ104B425T5 matches all critical electrical parameters (100kΩ at 25°C, ±5% tolerance, 4250K B25/85) and the mechanical package format (1206 surface mount). No circuit modifications are required.

Q: What is the significance of the B25/85 value in thermistor selection?

A: The B25/85 value (4250K) defines the thermal sensitivity of the thermistor between 25°C and 85°C. This parameter must match exactly for equivalent temperature sensing performance. Both the LR104R0J and NHQ104B425T5 share this specification.

Q: Why is the LR104R0J listed as obsolete?

A: Littelfuse Inc. has discontinued this part number. The NHQ104B425T5 provides functional and mechanical equivalence for applications requiring this thermistor specification.

Q: Does the Tape & Reel packaging of the NHQ104B425T5 affect compatibility?

A: No. Tape & Reel is a standard packaging format for surface mount components and is compatible with automated assembly equipment. The component itself is identical to bulk or alternative packaging formats.

Q: Are there compliance differences between the two parts?

A: Both components carry the same ECCN (EAR99) and HTSUS (8533.40.8070) classifications. The LR104R0J is ROHS3 compliant, while the NHQ104B425T5 is RoHS non-compliant. Verify compliance requirements for your specific application.