PR302J2 NTC Thermistor 3kΩ Bead - Equivalent & Substitute Parts

Part Overview

The PR302J2 is an NTC (Negative Temperature Coefficient) thermistor manufactured by Littelfuse Inc., designed for temperature sensing applications. This component features a 3kΩ resistance at 25°C with a B value of 3892K, housed in an epoxy bead package with 1.75" lead wire length. The PR302J2 is classified as obsolete, making identification of active equivalent parts essential for ongoing procurement and system maintenance.

Substiute Parts

PR302J2

Littelfuse Inc.In Stock: 831PR302J2 Datasheet

Current PartRFQ

PS302J2

Littelfuse Inc.In Stock: 872PS302J2 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PR302J2 is determined by the following critical electrical and mechanical parameters:

• Resistance Value: 3kΩ at 25°C (primary thermal characteristic)
• B Value: 3892K (thermal response curve definition)
• Maximum Power Dissipation: 30 mW (thermal stability requirement)
• Package Type: Bead, Epoxy (physical form factor)
• Lead Wire Configuration: Free Hanging mounting type
• Regulatory Compliance: ROHS3 Compliant, REACH Unaffected

The PS302J2 meets all critical electrical parameters and maintains identical thermal characteristics (3kΩ, 3892K B value, 30 mW maximum power). The primary differences are product status (Active vs. Obsolete), lead wire length (1.50" vs. 1.75"), and operating temperature range specification.

Parameter Comparison

Engineering Selection Recommendations

The PS302J2 is the manufacturer-recommended substitute for the obsolete PR302J2. Both components share identical electrical characteristics (3kΩ resistance, 3892K B value, 30 mW maximum power dissipation) and are housed in the same epoxy bead package type. Both maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment.

The PS302J2 is currently in active production status with confirmed inventory availability, whereas the PR302J2 is obsolete. The lead wire length difference (1.50" vs. 1.75") must be evaluated against specific application mounting requirements. For applications where the 0.25" lead wire length reduction is acceptable, the PS302J2 provides direct electrical and thermal equivalence with the advantage of ongoing manufacturer support and supply continuity.

Frequently Asked Questions (FAQ)

Q: Are PR302J2 and PS302J2 electrically interchangeable?

A: Yes. Both components have identical resistance values (3kΩ @ 25°C), B values (3892K), and maximum power ratings (30 mW). The thermal response characteristics are equivalent.

Q: What is the significance of the lead wire length difference?

A: The PS302J2 has a 0.25" shorter lead wire (1.50" vs. 1.75"). This difference affects physical mounting and circuit board layout. Verify that the shorter lead length accommodates your application's mounting geometry and spacing requirements.

Q: Why is the PR302J2 marked as obsolete?

A: The PR302J2 has been discontinued by Littelfuse Inc. The PS302J2 represents the active product line continuation with identical thermal and electrical specifications.

Q: Do both parts meet current regulatory requirements?

A: Yes. Both PR302J2 and PS302J2 are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards.

Q: What is the operating temperature range for each part?

A: The PR302J2 specifies 50°C operating temperature. The PS302J2 specifies -80°C to 150°C operating temperature range. The PS302J2 provides a wider operational envelope.

Q: Can I use PS302J2 in existing designs specified for PR302J2?

A: Electrical and thermal substitution is valid. Physical integration requires verification that the 1.50" lead wire length accommodates your circuit board layout and mounting configuration.