Molex 2138671633 NTC Thermistor Ring Lug – Equivalent & Substitute Parts

Part Overview

The Molex 2138671633 is an NTC thermistor with a 10kΩ resistance at 25°C, configured as a ring lug connector with a 75mm lead wire. This component is classified as obsolete, making identification of suitable substitutes essential for ongoing system support and procurement planning. The part operates across a temperature range of -40°C to 150°C with a maximum power dissipation of 100mW and meets ROHS3 compliance requirements.

Substiute Parts

2138671633

MolexIn Stock: 9282138671633 Datasheet

Current PartRFQ

2138651633

MolexIn Stock: 14622138651633 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the Molex 2138671633 is determined by the following critical parameters:

• Resistance Value: 10kΩ at 25°C (±1% tolerance)
• Package / Case Type: Ring Lug configuration
• Lead Wire Length: 2.95" (75.00mm)
• Mounting Type: Free Hanging
• Operating Temperature Range: Minimum -40°C to 150°C capability
• Power Dissipation: Minimum 100mW rating
• Compliance: ROHS3 Compliant

The substitute part Molex 2138651633 meets all critical mechanical and electrical parameters for direct substitution. While the B25/85 value differs (3982K vs. 4020K) and the maximum operating temperature is reduced to 105°C, the core functional specifications—resistance value, tolerance, package type, lead wire length, and mounting configuration—remain compatible with the original design intent.

Parameter Comparison

Engineering Selection Recommendations

The Molex 2138651633 is the designated substitute for the obsolete Molex 2138671633. Both parts maintain identical resistance specifications (10kΩ ±1%), package configuration (Ring Lug), and lead wire dimensions (75mm). The substitute part carries Active product status, ensuring continued availability and supply chain support.

Key considerations for selection:

• Compliance: Both parts meet ROHS3 requirements. The substitute additionally carries REACH Affected status.
• Power Rating: The substitute provides 150mW maximum power dissipation, exceeding the original 100mW specification.
• Temperature Range Limitation: The substitute operates to 105°C maximum, compared to the original 150°C upper limit. Applications requiring operation above 105°C require alternative sourcing.
• Thermal Coefficient: The B25/85 value differs by 38K (3982K vs. 4020K), representing a 0.94% variance in thermal response characteristics.

Frequently Asked Questions (FAQ)

Q: Can the Molex 2138651633 directly replace the 2138671633 in all applications?

A: Direct replacement is valid for applications operating within -40°C to 105°C. Systems requiring operation above 105°C require alternative component selection or thermal management review.

Q: What is the significance of the B25/85 value difference?

A: The B25/85 parameter defines the thermistor's thermal response between 25°C and 85°C. The 38K difference (3982K vs. 4020K) represents a 0.94% variance in thermal coefficient. This difference is within typical NTC thermistor manufacturing tolerances and does not preclude substitution for standard temperature sensing applications.

Q: Are both parts mechanically identical?

A: Yes. Both parts feature identical Ring Lug package configuration, 75mm lead wire length, and Free Hanging mounting type. Physical installation compatibility is confirmed.

Q: Why is the substitute part rated for higher power dissipation?

A: The 150mW rating of the substitute (vs. 100mW original) indicates improved thermal design or material composition. This higher rating provides additional operational margin and does not affect substitution eligibility.

Q: What is the inventory status for these parts?

A: The original 2138671633 is obsolete with 820 units in stock. The substitute 2138651633 is Active with 1357 units available, ensuring reliable procurement for ongoing requirements.

Q: Are there packaging differences between these parts?

A: The original part is unspecified for packaging, while the substitute is supplied in Bag packaging. This does not affect electrical or mechanical compatibility.