PS102J2 NTC Thermistor Equivalent & Substitute Parts

Part Overview

The PS102J2 is an NTC thermistor manufactured by Littelfuse Inc., designed as a 1kΩ bead-type temperature sensor with epoxy packaging. This component is classified as obsolete, making equivalent substitutes necessary for ongoing applications and new designs. The PS102J2 features a B0/50 value of 3892K and operates at a maximum temperature of 75°C with 30mW power dissipation capability. Identification of compatible alternatives ensures design continuity and supply chain reliability.

Substiute Parts

PS102J2

Littelfuse Inc.In Stock: 934PS102J2 Datasheet

Current PartRFQ

2152723105

MolexIn Stock: 11632152723105 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PS102J2 is determined by the following critical parameters:

• Resistance value at 25°C (1kΩ nominal)
• B0/50 thermal coefficient (3892K)
• Package configuration (bead-type epoxy)
• Operating temperature range compatibility
• RoHS and regulatory compliance status

The Molex part number 2152723105 qualifies as a substitute based on matching resistance value, B0/50 coefficient, bead package type, and ROHS3 compliance. Variations in resistance tolerance, lead wire length, and operating temperature range are acceptable within engineering design parameters for thermistor applications.

Parameter Comparison

Engineering Selection Recommendations

The Molex 2152723105 is the qualified substitute for the obsolete Littelfuse PS102J2. Both components maintain ROHS3 compliance and identical thermal coefficients (3892K B0/50), ensuring functional equivalence in temperature sensing applications.

The Molex part offers an extended operating temperature range (-40°C to 135°C) compared to the PS102J2 (75°C maximum), providing greater thermal headroom for diverse application environments. The active product status of the Molex component ensures long-term availability and supply chain stability.

Lead wire length differs by 5mm (38mm vs. 33mm), and mounting classification differs (free hanging vs. through hole). These mechanical variations require evaluation within specific circuit board layout and assembly requirements. Resistance tolerance specifications differ (±0.1°C vs. ±1%), with the Molex component providing ±1% tolerance with defined B value tolerance (±1%).

Frequently Asked Questions (FAQ)

Q: Can the Molex 2152723105 directly replace the PS102J2 in existing designs?

A: Functional substitution is supported based on matching resistance value (1kΩ) and thermal coefficient (3892K B0/50). Physical layout modifications may be required due to 5mm lead wire length difference and mounting type classification change. Verify circuit board routing and assembly compatibility before implementation.

Q: What is the significance of the B0/50 value in thermistor selection?

A: The B0/50 value (3892K for both components) defines the thermistor's thermal sensitivity and temperature-resistance relationship. Matching B values ensures equivalent temperature measurement characteristics across the operating range.

Q: How do resistance tolerance differences affect circuit performance?

A: The PS102J2 specifies ±0.1°C tolerance, while the Molex 2152723105 specifies ±1% tolerance. For precision temperature sensing applications, tolerance differences may require circuit calibration adjustments. Evaluate measurement accuracy requirements within your specific application.

Q: Is the extended operating temperature range of the Molex part beneficial?

A: The Molex component operates from -40°C to 135°C versus the PS102J2's 75°C maximum. Extended range capability provides design flexibility for applications requiring broader thermal operation, though the PS102J2's original 75°C specification remains the functional requirement baseline.

Q: Are there any compliance or regulatory differences between these components?

A: Both components are ROHS3 compliant with identical ECCN (EAR99) and HTSUS classifications, ensuring equivalent regulatory status for procurement and export purposes.