LC222J2K NTC Thermistor Equivalent & Substitute Parts

Part Overview

The LC222J2K 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 product is currently classified as obsolete, making identification of suitable substitute components essential for ongoing system support and new design implementations. The LC222J2K operates across a temperature range up to 150°C and maintains ROHS3 compliance with unlimited moisture sensitivity rating.

Substiute Parts

LC222J2K

Littelfuse Inc.In Stock: 1136LC222J2K Datasheet

Current PartRFQ

701033

TE Connectivity Measurement SpecialtiesIn Stock: 1135701033 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LC222J2K is determined by the following critical parameters:

Primary Matching Criteria:

• Resistance value at 25°C: 2.252kΩ (core functional requirement)
• B-value characteristics: B0/50 range of 3891K–3892K (thermal response curve)
• Package form: Bead configuration with free hanging mounting
• Operating temperature capability: minimum 150°C upper limit
• Regulatory compliance: ROHS3 and REACH status alignment

Secondary Compatibility Factors:

• Resistance tolerance specifications
• Lead wire length accommodation in circuit design
• Moisture sensitivity classification

The substitute part 701033 meets all primary matching criteria with equivalent resistance at 25°C, comparable B-value (3891K), identical bead package form, and extended operating temperature range (-55°C to 150°C). Both components maintain ROHS3 compliance and REACH unaffected status.

Parameter Comparison

Engineering Selection Recommendations

The 701033 from TE Connectivity Measurement Specialties is the qualified manufacturer-recommended substitute for the obsolete LC222J2K. Selection of this substitute is supported by:

Regulatory and Compliance Alignment:

• Both components maintain ROHS3 compliance
• Both components carry REACH unaffected status
• Identical ECCN and HTSUS classifications

Functional Equivalence:

• Matching 2.252kΩ resistance at 25°C ensures direct thermal response compatibility
• B-value specifications (3891K vs 3892K) fall within acceptable thermal curve tolerance for NTC thermistor applications
• Extended operating temperature range (-55°C to 150°C) on the 701033 provides additional operational margin

Product Status Consideration:

• The 701033 maintains active product status with confirmed inventory availability, ensuring long-term supply chain viability
• The LC222J2K obsolete status necessitates transition to an active equivalent

Physical Integration Factor:

• Lead wire length differs (76.20mm vs 38.00mm); circuit board layout and component placement must accommodate the longer leads of the 701033

Frequently Asked Questions (FAQ)

Q: Can the 701033 directly replace the LC222J2K without circuit modification?

A: The 701033 provides functional thermal sensing equivalence with matching resistance and comparable B-value characteristics. However, the extended lead wire length (76.20mm vs 38.00mm) requires verification that circuit board layout and component mounting accommodate the longer leads. No electrical circuit modifications are necessary.

Q: What is the significance of the B-value difference (3891K vs 3892K)?

A: The B-value defines the NTC thermistor's thermal response curve. The 1K difference between 3891K and 3892K represents negligible deviation in practical temperature sensing applications and falls within acceptable tolerance for NTC thermistor substitution.

Q: Why does the 701033 have a different resistance tolerance specification (±0.1°C vs ±10%)?

A: The tolerance specifications use different measurement bases. The LC222J2K specifies tolerance as a percentage of resistance value (±10%), while the 701033 specifies tolerance as a temperature differential (±0.1°C). Both components maintain equivalent precision for temperature sensing applications at the 2.252kΩ resistance point.

Q: Is the extended operating temperature range of the 701033 (-55°C to 150°C) a concern?

A: The extended lower temperature capability of the 701033 is advantageous and presents no compatibility issues. Applications requiring operation only up to 150°C will function identically with the 701033's expanded range.

Q: Are there any moisture sensitivity differences between these components?

A: The LC222J2K carries MSL 1 (unlimited), while the 701033 is classified as not applicable. Both designations indicate minimal moisture sensitivity risk for standard handling and storage conditions.

Q: What inventory status should be considered for procurement?

A: Both components show confirmed new original stock availability (LC222J2K: 1049 pcs; 701033: 1051 pcs). The 701033's active product status provides superior long-term supply chain assurance compared to the obsolete LC222J2K.