LR252L0J Equivalent & Substitute Parts

Part Overview

The LR252L0J is an NTC thermistor manufactured by Littelfuse Inc., designed for temperature sensing applications. It features a resistance of 2.5kΩ at 25°C with a B-value of 4100K, housed in a 1206 (3216 Metric) surface mount package. The part is classified as obsolete, necessitating identification of active equivalent components to maintain supply chain continuity and support ongoing production requirements.

Substiute Parts

LR252L0J

Littelfuse Inc.In Stock: 649LR252L0J Datasheet

Current PartRFQ

NHQ252B410T5

Amphenol ThermometricsIn Stock: 817NHQ252B410T5 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LR252L0J is determined by strict equivalence across the following critical parameters:

• Resistance value: 2.5kΩ at 25°C
• Resistance tolerance: ±5%
• B-value: 4100K (B25/85)
• Operating temperature range: -40°C to 125°C
• Package / Case: 1206 (3216 Metric)
• Mounting type: Surface Mount
• Moisture Sensitivity Level: MSL 1

The substitute part NHQ252B410T5 meets all these electrical and mechanical specifications, enabling direct functional replacement in applications requiring NTC thermistor temperature sensing.

Parameter Comparison

Engineering Selection Recommendations

The NHQ252B410T5 from Amphenol Thermometrics is a direct electrical and mechanical equivalent to the obsolete LR252L0J. Both components share identical resistance values, B-values, operating temperature ranges, and package specifications.

Selection between these parts should consider compliance requirements. The LR252L0J carries ROHS3 compliance, while the NHQ252B410T5 is RoHS non-compliant. Applications subject to RoHS directives may require the compliant alternative or further investigation into equivalent parts meeting both electrical specifications and regulatory requirements.

The NHQ252B410T5 is currently in active production with confirmed inventory availability, making it suitable for immediate procurement to replace the obsolete LR252L0J in new designs and production runs.

Frequently Asked Questions (FAQ)

Q: Can the NHQ252B410T5 be used as a direct replacement for the LR252L0J?

A: Yes. Both components have identical resistance values (2.5kΩ), B-values (4100K), operating temperature ranges (-40°C to 125°C), and 1206 package specifications. They are electrically and mechanically interchangeable.

Q: What is the difference in RoHS compliance between these parts?

A: The LR252L0J is ROHS3 compliant, while the NHQ252B410T5 is RoHS non-compliant. Applications requiring RoHS compliance must use the LR252L0J or identify an alternative part meeting both electrical specifications and RoHS requirements.

Q: Are there packaging differences between these parts?

A: The LR252L0J packaging type is not specified in available data. The NHQ252B410T5 is supplied in Tape & Reel (TR) format. Both use the 1206 (3216 Metric) surface mount package. Verify packaging requirements for your assembly process.

Q: What does the B-value represent?

A: The B-value (4100K) is a material constant that describes the temperature sensitivity of the NTC thermistor. It defines the relationship between resistance and temperature. Matching B-values ensures equivalent temperature response characteristics.

Q: Is the maximum power dissipation specification critical for substitution?

A: The LR252L0J specifies 400 mW maximum power dissipation. The NHQ252B410T5 does not provide this specification in available data. Verify power dissipation requirements for your application to ensure the substitute part is suitable.