PX302J2 Equivalent & Substitute Parts

Part Overview

The PX302J2 is an NTC thermistor manufactured by Littelfuse Inc., designed as a 3kΩ bead-type temperature sensor with epoxy packaging. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing applications and new designs. The PX302J2 operates at a maximum temperature of 120°C with a power rating of 30 mW and features 1.50" lead wire length in a free-hanging mounting configuration.

Substiute Parts

PX302J2

Littelfuse Inc.In Stock: 1153PX302J2 Datasheet

Current PartRFQ

701030

TE Connectivity Measurement SpecialtiesIn Stock: 1128701030 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The TE Connectivity Measurement Specialties part number 701030 qualifies as a substitute for the PX302J2 based on the following critical parameters:

• Identical resistance value at 25°C: 3kΩ
• Comparable B0/50 thermal coefficient: 3891K (versus 3892K in the original)
• Bead-type package configuration with free-hanging mounting
• Superior resistance tolerance: ±0.1°C (tighter than the original ±1°C)
• Extended operating temperature range: -55°C to 150°C (exceeds the original 120°C maximum)
• ROHS3 compliance matching the original specification
• Identical HTSUS and ECCN classifications

The 701030 operates within the thermal and electrical parameters required for PX302J2 applications while offering improved tolerance specifications and broader temperature operating range.

Parameter Comparison

Engineering Selection Recommendations

The 701030 from TE Connectivity Measurement Specialties is the qualified substitute for the obsolete PX302J2. Selection of this substitute is supported by:

• Active product status ensuring continued availability and supply chain reliability
• Matching core electrical specifications (3kΩ resistance, comparable B-value thermal coefficient)
• ROHS3 compliance alignment with the original component
• Tighter resistance tolerance (±0.1°C) providing improved measurement accuracy
• Extended operating temperature range (-55°C to 150°C) offering greater application flexibility

The primary design consideration is the increased lead wire length (3.00" versus 1.50"), which must be evaluated for mechanical fit within the target application. The substitute maintains functional equivalence for temperature sensing applications within the specified thermal and electrical parameters.

Frequently Asked Questions (FAQ)

Q: Can the 701030 directly replace the PX302J2 in all applications?

A: The 701030 provides electrical and thermal equivalence based on matching resistance values and B-value thermal coefficients. The extended lead wire length (3.00" versus 1.50") requires verification for mechanical compatibility in the target assembly.

Q: What is the significance of the B0/50 and B25/85 values?

A: The B-value defines the thermistor's thermal response curve. The 701030 B0/50 value of 3891K is within 0.03% of the PX302J2 specification (3892K), ensuring equivalent temperature sensing characteristics across the operating range.

Q: Why does the 701030 have a wider operating temperature range?

A: The 701030 is specified for -55°C to 150°C operation, exceeding the PX302J2 maximum of 120°C. This extended range does not affect substitution validity; applications requiring only 120°C operation remain fully compatible.

Q: Are there packaging differences between these components?

A: Both components use bead-type packages with free-hanging mounting. The PX302J2 specifies epoxy packaging, while the 701030 lists bead packaging. Both maintain the same functional form factor for temperature sensing applications.

Q: What compliance certifications apply to the 701030?

A: The 701030 maintains ROHS3 compliance matching the original PX302J2, with identical ECCN (EAR99) and HTSUS (8533.40.8070) classifications for regulatory and trade purposes.