TE Connectivity Measurement Specialties 081105 NTC Thermistor Equivalent & Substitute Parts

Part Overview

The TE Connectivity Measurement Specialties 081105 is an NTC thermistor probe with a resistance value of 2.252k ohms at 25°C and a B25/85 value of 3976K. This component is classified as obsolete, making identification of equivalent and substitute parts necessary for ongoing system maintenance and new design implementations. The 081105 operates within a temperature range of 0°C to 70°C and is configured as a free-hanging probe assembly suitable for thermal sensing applications.

Substiute Parts

081105

TE Connectivity Measurement SpecialtiesIn Stock: 1187081105 Datasheet

Current PartRFQ

NTCLP100E3222H

Vishay Beyschlag/Draloric/BC ComponentsIn Stock: 1549NTCLP100E3222H Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the obsolete TE Connectivity 081105 is determined by alignment of the following critical electrical and mechanical parameters:

Electrical Parameters:

• Resistance value at 25°C: The main part specifies 2.252k ohms. Substitute parts must operate within the same functional resistance range to maintain circuit performance and thermal response characteristics.
• B25/85 thermal coefficient: The main part specifies 3976K. Substitute parts with B25/85 values within ±1% of this specification maintain equivalent temperature-to-resistance conversion curves.
• Resistance tolerance: The main part specifies ±0.1°C tolerance. Substitute parts with comparable or tighter tolerance specifications ensure consistent thermal measurement accuracy.
• B value tolerance: The main part specifies ±0.4%. Substitute parts with B value tolerance of ±0.75% or better maintain acceptable thermal response consistency.

Mechanical Parameters:

• Mounting type: Free hanging configuration required for direct replacement.
• Package type: Probe configuration required for form factor compatibility.
• Operating temperature range: The main part operates 0°C ~ 70°C. Substitute parts with extended or equivalent operating ranges are acceptable.

Compliance Parameters:

• Moisture sensitivity level: MSL 1 (Unlimited) required.
• ECCN and HTSUS classifications: Substitute parts must maintain equivalent export control and tariff classifications.

The substitute part NTCLP100E3222H meets these criteria with a 2.2k ohm resistance (within functional equivalence to 2.252k), B25/85 value of 3977K (within ±0.03% of the main part), and extended operating temperature range of -40°C ~ 85°C.

Parameter Comparison

Engineering Selection Recommendations

The NTCLP100E3222H from Vishay Beyschlag/Draloric/BC Components is a direct functional substitute for the obsolete TE Connectivity 081105. The substitute part maintains electrical equivalence through matching B25/85 thermal coefficients (3977K versus 3976K, representing 0.03% variance) and comparable resistance values at 25°C (2.2k versus 2.252k, representing 2.3% variance). Both components share identical moisture sensitivity levels, export control classifications, and tariff codes.

The NTCLP100E3222H offers additional advantages in terms of product status: it is currently active in production, ensuring long-term availability. The substitute part also provides an extended operating temperature range (-40°C ~ 85°C versus 0°C ~ 70°C), which accommodates a broader spectrum of thermal sensing applications. The substitute part carries ROHS3 compliance and REACH unaffected status, meeting modern environmental and regulatory requirements.

The resistance tolerance specification differs between the two parts (±0.1°C for the main part versus ±3% for the substitute). This difference reflects manufacturing process variations between manufacturers but does not preclude functional substitution in applications where the 2.2k nominal value and 3977K B coefficient are acceptable.

Frequently Asked Questions (FAQ)

Q: Can the NTCLP100E3222H directly replace the 081105 in existing designs?

A: The NTCLP100E3222H is functionally equivalent to the 081105 for thermal sensing applications. Both components operate as NTC thermistors with matching B25/85 thermal coefficients and comparable resistance values. The 2.3% difference in nominal resistance (2.2k versus 2.252k) and the extended operating temperature range of the substitute part do not prevent direct replacement in circuits designed for the 081105. Circuit validation is necessary to confirm performance within specific application parameters.

Q: What is the significance of the B25/85 value in thermistor substitution?

A: The B25/85 value defines the thermal response characteristic of an NTC thermistor, specifically the temperature coefficient of resistance between 25°C and 85°C. The 081105 specifies 3976K and the NTCLP100E3222H specifies 3977K, representing a 0.03% variance. This near-identical specification ensures that both thermistors exhibit equivalent temperature-to-resistance conversion curves across their operating ranges, making them suitable substitutes for temperature measurement and compensation circuits.

Q: How does the resistance tolerance difference affect substitution?

A: The 081105 specifies ±0.1°C resistance tolerance, while the NTCLP100E3222H specifies ±3% tolerance. The tolerance specification indicates the manufacturing precision of the resistance value at 25°C. The substitute part's ±3% tolerance is typical for cylindrical probe thermistors and remains acceptable for most thermal sensing applications. Applications requiring tighter tolerance specifications may require additional circuit compensation or calibration.

Q: Is the extended operating temperature range of the substitute part a concern?

A: The NTCLP100E3222H operates from -40°C to 85°C, compared to the 081105 operating range of 0°C to 70°C. The extended range of the substitute part does not create compatibility issues for applications operating within the original 0°C to 70°C specification. The substitute part is suitable for applications requiring operation outside the original temperature range.

Q: What packaging differences exist between the main part and substitute?

A: Both components are configured as free-hanging probe assemblies. The 081105 is specified as a probe, while the NTCLP100E3222H is specified as a cylindrical probe with brass construction. The brass construction of the substitute part provides enhanced thermal conductivity and mechanical durability compared to standard probe configurations. The substitute part includes a 14.76-inch (375mm) lead wire length specification, which may differ from the main part if lead wire length was specified.

Q: Are there regulatory or compliance considerations for substitution?

A: Both the 081105 and NTCLP100E3222H share identical ECCN (EAR99) and HTSUS (8533.40.8070) classifications, ensuring equivalent export control and tariff treatment. The NTCLP100E3222H carries ROHS3 compliance and REACH unaffected status, meeting current environmental regulations. The 081105 does not specify these compliance statuses. Designs requiring ROHS3 or REACH compliance benefit from substitution with the NTCLP100E3222H.