Molex 2138682033 NTC Thermistor Ring Lug Temperature Sensor

Part Overview

The Molex 2138682033 is an NTC thermistor temperature sensor featuring a 100kΩ resistance at 25°C with a ring lug termination and 75mm lead wire length. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing system support and procurement planning. The part operates across a -40°C to 150°C temperature range with a maximum power dissipation of 100mW and is housed in a free-hanging ring lug package configuration.

Substiute Parts

2138682033

MolexIn Stock: 9012138682033 Datasheet

Current PartRFQ

2138652033

MolexIn Stock: 8202138652033 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for NTC thermistor temperature sensors is determined by the following critical parameters:

• Resistance Value @ 25°C: Must match at 100kΩ
• Resistance Tolerance: Must be ±2% or tighter
• Package / Case Type: Must be Ring Lug configuration
• Lead Wire Length: Must be 2.95" (75.00mm)
• Mounting Type: Must be Free Hanging
• Operating Temperature Range: Substitute must cover the application's required temperature window

The Molex 2138652033 qualifies as a substitute based on matching resistance value, tolerance, package type, lead wire length, and mounting configuration. However, the operating temperature range differs, requiring evaluation against specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

The Molex 2138652033 is an active product with ROHS3 compliance, providing a viable substitute for the obsolete 2138682033 where operating temperature requirements do not exceed 105°C. Both parts share identical resistance values, tolerances, lead wire lengths, and ring lug package configurations, ensuring mechanical and electrical compatibility in applications within the substitute's temperature range.

Applications requiring operation above 105°C must retain the original 2138682033 specification or identify alternative suppliers offering NTC thermistors with matching parameters and extended temperature ratings.

Frequently Asked Questions (FAQ)

Q: Can the 2138652033 be used as a direct replacement for the 2138682033?

A: The 2138652033 is mechanically and electrically compatible for applications operating within -40°C to 105°C. The original part specifies -40°C to 150°C operation. Substitution is valid only if your application does not require temperatures above 105°C.

Q: What is the significance of the B25/85 value difference (4035K vs. 3982K)?

A: The B25/85 value defines the thermistor's thermal sensitivity between 25°C and 85°C. The 53K difference represents a minor variation in the temperature-resistance curve. Both values fall within acceptable ranges for standard NTC thermistor applications but may produce slightly different resistance readings at intermediate temperatures.

Q: Are the physical packages identical?

A: Yes. Both parts feature ring lug terminations, 75mm lead wire lengths, and free-hanging mounting configurations. No mechanical modifications are required for substitution.

Q: Does the higher maximum power rating (150mW vs. 100mW) on the substitute affect compatibility?

A: No. A higher power rating indicates the substitute can safely dissipate more heat. If your application operates within the original 100mW specification, the substitute's 150mW rating provides additional thermal margin without affecting performance.

Q: Is RoHS3 compliance a requirement for substitution?

A: RoHS3 compliance is a regulatory and procurement consideration. The substitute's ROHS3 certification makes it suitable for applications with environmental compliance requirements. The original part's compliance status is not specified in available documentation.