TC222J2K NTC Thermistor Equivalent & Substitute Parts

Part Overview

The TC222J2K is an NTC thermistor manufactured by Littelfuse Inc., designed for temperature sensing applications. This component features a 2.252kΩ resistance at 25°C with a bead form factor and epoxy packaging. The part is currently classified as obsolete, making identification of suitable substitute components essential for ongoing system support and new design implementations. The TC222J2K operates across a temperature range up to 150°C and maintains ROHS3 compliance with unlimited moisture sensitivity rating.

Substiute Parts

TC222J2K

Littelfuse Inc.In Stock: 998TC222J2K Datasheet

Current PartRFQ

701033

TE Connectivity Measurement SpecialtiesIn Stock: 1135701033 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the TC222J2K is determined by the following critical parameters:

• Resistance Value: The substitute must maintain 2.252kΩ at 25°C to ensure equivalent thermal response characteristics
• B Value (Thermal Coefficient): The B0/50 value of 3892K defines the thermistor's temperature-resistance curve; substitutes with B0/50 values within the tolerance band (3891K) are functionally equivalent
• Operating Temperature Range: The substitute must support the full 150°C upper limit required by the application
• Package Configuration: Bead form factor with free-hanging mounting type ensures mechanical compatibility
• Regulatory Compliance: ROHS3 compliance is mandatory for equivalent substitution

The part 701033 from TE Connectivity Measurement Specialties meets these substitution criteria with matching resistance specifications and thermal characteristics.

Parameter Comparison

Engineering Selection Recommendations

The 701033 thermistor from TE Connectivity Measurement Specialties is the designated substitute for the obsolete TC222J2K. Both components maintain identical resistance specifications at 25°C and equivalent B-value thermal coefficients, ensuring interchangeable thermal response in temperature sensing circuits.

The 701033 offers extended operating range (-55°C to 150°C) compared to the TC222J2K, providing additional design flexibility for applications requiring sub-zero temperature measurement. Both components maintain ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements for equivalent substitution.

The primary mechanical difference is lead wire length: the 701033 provides 3.00" (76.20mm) leads versus the TC222J2K's 1.50" (38.00mm). This difference must be evaluated against specific circuit board layout and assembly requirements.

Frequently Asked Questions (FAQ)

Q: Can the 701033 be used as a direct replacement for the TC222J2K?

A: Yes. Both components share identical 2.252kΩ resistance at 25°C and equivalent B-value thermal coefficients (3892K vs. 3891K), ensuring functionally equivalent temperature sensing performance. The 701033 is an active product, making it suitable for new designs and obsolescence mitigation.

Q: What is the significance of the B-value difference between 3892K and 3891K?

A: The B-value defines the thermistor's temperature-resistance curve. The difference of 1K between these values is negligible for practical temperature sensing applications and falls within acceptable tolerance bands for NTC thermistor substitution.

Q: Does the longer lead wire on the 701033 affect compatibility?

A: Lead wire length is a mechanical consideration. The 701033's 3.00" leads versus the TC222J2K's 1.50" leads may require circuit board layout adjustment. Verify that the longer leads accommodate your specific mounting configuration and do not introduce unintended mechanical stress.

Q: Are both components compliant with current regulatory standards?

A: Yes. Both the TC222J2K and 701033 maintain ROHS3 compliance and REACH unaffected status, meeting current regulatory requirements for electronic component substitution.

Q: What is the difference between the operating temperature ranges?

A: The TC222J2K operates up to 150°C, while the 701033 operates from -55°C to 150°C. The 701033's extended lower temperature range provides additional capability for applications requiring sub-zero temperature measurement. Both components support the full 150°C upper limit.