Equivalent & Substitute Parts for PR303J2

Part Overview

The PR303J2 is an NTC thermistor temperature sensor manufactured by Littelfuse Inc., featuring a 30kΩ resistance at 25°C with a bead epoxy package and free hanging mounting configuration. This component is classified as obsolete, necessitating identification of active equivalent parts to maintain supply chain continuity and support ongoing production requirements.

Substiute Parts

PR303J2

Littelfuse Inc.In Stock: 1023PR303J2 Datasheet

Current PartRFQ

PS303J2

Littelfuse Inc.In Stock: 2210PS303J2 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PR303J2 is determined by the following critical electrical and mechanical parameters:

• Resistance value at 25°C: 30kΩ
• B0/50 thermal coefficient: 3892K
• Maximum power dissipation: 30 mW
• Physical package: Bead, Epoxy
• Lead wire length: 1.50" (38.00mm)
• Mounting configuration: Free Hanging

The PS303J2 qualifies as a direct substitute based on matching all critical electrical parameters (30kΩ resistance, 3892K B-value, 30 mW power rating) and identical physical packaging specifications. The substitute part maintains the same bead epoxy construction and lead wire dimensions, ensuring mechanical compatibility in existing circuit designs.

Parameter Comparison

Engineering Selection Recommendations

The PS303J2 is the manufacturer-recommended substitute for the obsolete PR303J2. Both components are manufactured by Littelfuse Inc. and maintain identical electrical characteristics (30kΩ resistance, 3892K B-value) and physical packaging specifications. The PS303J2 is currently in active production status with higher inventory availability (2170 pcs in stock versus 930 pcs for the obsolete PR303J2).

Both parts maintain ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements for current manufacturing environments. The PS303J2 offers an extended operating temperature range (-80°C to 150°C compared to -55°C to 80°C), providing additional thermal margin for applications requiring broader temperature operation.

Frequently Asked Questions (FAQ)

Q: Can PS303J2 be used as a direct replacement for PR303J2 in existing designs?

A: Yes. The PS303J2 matches all critical electrical parameters (30kΩ resistance at 25°C, 3892K B-value, 30 mW maximum power) and physical specifications (bead epoxy package, 1.50" lead wire length, free hanging mounting). No circuit modifications are required.

Q: What is the difference between PR303J2 and PS303J2?

A: The primary differences are product status and operating temperature range. PR303J2 is obsolete with a -55°C to 80°C operating range, while PS303J2 is active production with a -80°C to 150°C operating range. All electrical characteristics and physical packaging are identical.

Q: Are there packaging differences between these parts?

A: PR303J2 is supplied in standard packaging, while PS303J2 is supplied in bulk packaging. Both use identical bead epoxy construction with 1.50" lead wire length and free hanging mounting configuration.

Q: Do both parts meet current compliance standards?

A: Yes. Both PR303J2 and PS303J2 are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements for electronic component manufacturing and use.

Q: Which part should be selected for new designs?

A: PS303J2 should be selected for new designs as it is in active production status with established supply chain availability. The extended operating temperature range provides additional design flexibility for thermal applications.