Equivalent & Substitute Parts for Molex 2138662433 NTC Ring Cable Thermistor

Part Overview

The Molex 2138662433 is an NTC thermistor with a 4k ohm resistance at 25°C, configured as a ring lug cable assembly with a 75mm lead wire length. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing applications and new designs. The part operates across a -40°C to 150°C temperature range and is suitable for temperature sensing applications requiring ring lug termination.

Substiute Parts

2138662433

MolexIn Stock: 9632138662433 Datasheet

Current PartRFQ

2138652433

MolexIn Stock: 7972138652433 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the Molex 2138662433 is determined by the following critical parameters:

• Resistance Value @ 25°C: Primary electrical characteristic; acceptable substitutes must operate within the tolerance band of the original specification
• Package / Case Type: Ring lug termination is mandatory for mechanical compatibility
• Lead Wire Length: 75mm (2.95") is required for physical fit
• Operating Temperature Range: Must encompass or match the original -40°C to 150°C specification
• Mounting Type: Free hanging configuration must be maintained
• RoHS Compliance: ROHS3 compliance required for regulatory alignment

The Molex 2138652433 qualifies as a substitute based on matching package type, lead wire length, mounting configuration, and RoHS compliance. The resistance value of 4.7k ohms and B25/85 value of 3982K represent acceptable electrical variations within the NTC thermistor category for this application class.

Parameter Comparison

Engineering Selection Recommendations

The Molex 2138652433 is the identified substitute for the obsolete Molex 2138662433. Both components maintain ROHS3 compliance and are manufactured by Molex, ensuring consistent quality and supply chain reliability. The substitute part is currently in active production status, providing long-term availability for new designs and replacement applications.

The primary consideration for selection is the operating temperature range differential: the substitute part operates to 105°C maximum, compared to the original part's 150°C upper limit. Applications requiring operation above 105°C must retain the original part specification or identify alternative solutions. The resistance value increase from 4k to 4.7k ohms and the corresponding B25/85 value adjustment represent acceptable electrical parameter variations within NTC thermistor design tolerances.

Frequently Asked Questions (FAQ)

Q: Can the Molex 2138652433 be used as a direct replacement for the 2138662433?

A: The 2138652433 is mechanically and electrically compatible for applications operating within -40°C to 105°C. Applications requiring operation above 105°C require the original specification or alternative sourcing.

Q: What is the significance of the resistance value difference between 4k and 4.7k ohms?

A: Both values fall within standard NTC thermistor resistance classifications. The 4.7k ohm substitute maintains the same tolerance specification (±2%) and similar thermal characteristics (B25/85 values of 3991K vs. 3982K), making it functionally equivalent for temperature sensing applications within the specified operating range.

Q: Are both parts RoHS compliant?

A: Yes, both the Molex 2138662433 and 2138652433 are ROHS3 compliant, meeting current regulatory requirements for electronic component manufacturing and distribution.

Q: What is the impact of the 50 mW power rating increase in the substitute part?

A: The substitute part's 150 mW maximum power rating exceeds the original 100 mW specification, providing additional thermal dissipation capability. This represents an improvement in thermal handling capacity and does not restrict compatibility.

Q: Does packaging differ between the main part and substitute?

A: The main part is listed with no specified packaging designation, while the substitute is packaged in bags. Both components use identical ring lug case configuration and 75mm lead wire length, ensuring mechanical compatibility in assembly applications.