Equivalent & Substitute Parts for PR203J2

Part Overview

The PR203J2 is an NTC thermistor with 20kΩ resistance at 25°C, manufactured by Littelfuse Inc. in a bead epoxy package configuration. This component is classified as obsolete, which necessitates identification of active equivalent parts for ongoing applications requiring NTC thermistor functionality in temperature sensing circuits. The PR203J2 maintains ROHS3 compliance and unlimited moisture sensitivity rating, making it suitable for standard industrial temperature measurement applications.

Substiute Parts

PR203J2

Littelfuse Inc.In Stock: 1144PR203J2 Datasheet

Current PartRFQ

PS203J2

Littelfuse Inc.In Stock: 920PS203J2 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The PS203J2 qualifies as a direct substitute for the PR203J2 based on the following critical electrical and mechanical parameters:

• Identical resistance value: 20kΩ at 25°C
• Identical B value coefficient: 3892K (B0/50)
• Identical maximum power dissipation: 30 mW
• Identical package configuration: Bead, Epoxy
• Identical mounting type: Free Hanging
• Identical RoHS and MSL compliance levels

The PS203J2 is manufactured by the same supplier (Littelfuse Inc.) and maintains active product status, ensuring continued availability and supply chain reliability. Minor variations in lead wire length (1.50" versus 1.75") and operating temperature range do not affect the core thermistor functionality for standard temperature sensing applications.

Parameter Comparison

Engineering Selection Recommendations

The PS203J2 is the direct equivalent for PR203J2 replacement. Selection is based on:

• Electrical equivalence: Identical resistance and B value parameters ensure thermal response characteristics remain unchanged in temperature sensing circuits
• Compliance continuity: Both parts maintain ROHS3 compliance and unlimited MSL rating, preserving regulatory and environmental requirements
• Supply availability: PS203J2 active product status provides assured component availability, whereas PR203J2 obsolete status creates supply risk
• Mechanical compatibility: Identical package and mounting specifications allow direct substitution in existing PCB layouts and mechanical assemblies

The PS203J2 extended operating temperature range (75°C versus 50°C) provides additional thermal margin without affecting baseline functionality.

Frequently Asked Questions (FAQ)

Q: Can PS203J2 be used as a direct replacement for PR203J2 in existing designs?

A: Yes. The PS203J2 maintains identical electrical parameters (20kΩ resistance, 3892K B value, 30 mW power rating) and mechanical configuration (bead epoxy package, free hanging mount). Both components are ROHS3 compliant with unlimited MSL rating.

Q: What is the significance of the different lead wire lengths?

A: PR203J2 features 1.75" (44.45mm) leads while PS203J2 features 1.50" (38.00mm) leads. This difference affects mechanical assembly and spacing considerations but does not impact electrical performance. Lead length selection depends on specific PCB layout and mounting requirements.

Q: Does the extended operating temperature range of PS203J2 affect compatibility?

A: No. The PS203J2 operating temperature of 75°C exceeds the PR203J2 specification of 50°C, providing additional thermal margin. This extended range does not compromise functionality within the original design operating envelope.

Q: Are there any compliance or certification differences between these parts?

A: Both PR203J2 and PS203J2 maintain identical RoHS3 compliance, MSL Level 1 (Unlimited) rating, and REACH unaffected status. No compliance differences exist between the two components.

Q: Why is PR203J2 listed as obsolete?

A: PR203J2 carries obsolete product status, indicating discontinued manufacturing. PS203J2 active status ensures continued availability and supply chain support for new applications and replacement requirements.