Molex 2138672633 NTC Thermistor Ring Lug – Equivalent & Substitute Parts

Part Overview

The Molex 2138672633 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

2138672633

MolexIn Stock: 6782138672633 Datasheet

Current PartRFQ

2138652633

MolexIn Stock: 23192138652633 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the Molex 2138672633 is determined by the following critical parameters:

• Resistance Value: 10kΩ at 25°C with ±2% tolerance
• Package / Case Type: Ring Lug configuration
• Lead Wire Length: 2.95" (75.00mm)
• Mounting Type: Free Hanging
• Resistance Tolerance: ±2%
• RoHS Compliance: ROHS3 Compliant

The substitute part Molex 2138652633 satisfies all mandatory substitution criteria. Both parts share identical resistance values, tolerance specifications, lead wire dimensions, and package configurations. The substitute maintains the same mechanical interface and electrical baseline parameters required for direct replacement in ring lug thermistor applications.

Parameter Comparison

Engineering Selection Recommendations

The Molex 2138652633 is the qualified substitute for the obsolete Molex 2138672633. Selection is supported by the following factors:

Product Status: The substitute part carries Active status, ensuring ongoing availability and manufacturing support, whereas the main part is Obsolete.

Compliance Certification: Both parts maintain ROHS3 compliance, satisfying regulatory requirements for equivalent environmental standards.

Electrical Equivalence: Identical 10kΩ resistance at 25°C with matching ±2% tolerance ensures functional compatibility in temperature sensing circuits.

Mechanical Compatibility: Matching ring lug package configuration and 75mm lead wire length provide direct mechanical fit without redesign.

Thermal Performance: The substitute operates across -40°C to 105°C, which covers the lower portion of the main part's -40°C to 150°C range. Applications requiring operation above 105°C require thermal performance evaluation.

Power Dissipation: The substitute provides 150mW maximum power dissipation compared to 100mW in the main part, offering improved thermal headroom.

Frequently Asked Questions (FAQ)

Q: Can the Molex 2138652633 directly replace the Molex 2138672633 in all applications?

A: Direct replacement is supported for applications operating within the substitute's temperature range of -40°C to 105°C. Applications requiring operation above 105°C require thermal performance assessment against system requirements.

Q: What is the significance of the B25/85 value difference (4020K vs. 3982K)?

A: The B25/85 value characterizes the thermistor's thermal sensitivity between 25°C and 85°C. The 38K difference represents a minor variation in thermal response curve. Compatibility depends on the specific temperature measurement accuracy requirements of the application.

Q: Are the ring lug connectors mechanically identical?

A: Both parts feature ring lug package configuration with 75mm lead wire length and free hanging mounting type, ensuring mechanical compatibility without connector modification.

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

A: The substitute's 150mW rating versus the main part's 100mW provides additional thermal margin. This allows operation at higher self-heating levels without exceeding maximum junction temperature limits.

Q: Does the substitute part maintain the same RoHS compliance level?

A: Both parts are ROHS3 compliant, maintaining equivalent environmental and regulatory compliance standards.

Q: Is the substitute part currently available?

A: The Molex 2138652633 carries Active product status with 2263 pieces in stock, ensuring procurement availability compared to the Obsolete main part.