KS302J2 Equivalent & Substitute Parts

Part Overview

The KS302J2 is an NTC thermistor manufactured by Littelfuse Inc., designed as a temperature sensor with a 3kΩ resistance at 25°C in a bead epoxy package. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing applications and new designs. The KS302J2 maintains ROHS3 compliance and operates across a temperature range up to 135°C with a maximum power dissipation of 30mW.

Substiute Parts

KS302J2

Littelfuse Inc.In Stock: 875KS302J2 Datasheet

Current PartRFQ

2152723305

MolexIn Stock: 28502152723305 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the KS302J2 is determined by the following critical parameters:

• Resistance Value: 3kΩ at 25°C
• B Value (Thermal Characteristic): B0/50 = 3892K
• Package Type: Bead configuration with epoxy material
• Operating Temperature Range: Maximum 135°C
• Power Dissipation: 30mW maximum
• Compliance: ROHS3 compliance required

The substitute part 2152723305 from Molex meets these core electrical and mechanical requirements, maintaining functional equivalence for temperature sensing applications. Both parts share identical resistance values, B-value thermal characteristics, and compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

The 2152723305 (Molex) serves as a direct functional substitute for the obsolete KS302J2. Both components maintain ROHS3 compliance and identical electrical characteristics at the core thermal sensing function. The substitute part offers the advantage of active product status, ensuring continued availability and supply chain reliability.

Physical differences exist in lead wire length (38mm versus 33mm) and mounting configuration (free hanging versus through hole). These mechanical variations require evaluation within the specific application context to confirm compatibility with existing circuit board layouts and mechanical assemblies.

Frequently Asked Questions (FAQ)

Q: Can the 2152723305 directly replace the KS302J2 in all applications?

A: Electrical substitution is valid based on matching resistance values (3kΩ) and B-value thermal characteristics (3892K). Mechanical compatibility must be verified, particularly regarding lead wire length and mounting configuration differences.

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

A: The B0/50 value (3892K for both parts) defines the thermal response curve of the NTC thermistor. Matching B-values ensures equivalent temperature sensing behavior across the operating range.

Q: Does the resistance tolerance difference affect substitution?

A: The KS302J2 specifies ±0.1°C tolerance while the 2152723305 specifies ±1% tolerance. Both tolerances are acceptable for general temperature sensing applications, though the tighter tolerance of the original part may be required for precision applications.

Q: Are there compliance considerations for this substitution?

A: Both parts maintain ROHS3 compliance and share identical ECCN (EAR99) and HTSUS classifications, confirming regulatory equivalence for component selection purposes.

Q: What is the impact of the extended operating temperature range on the substitute part?

A: The 2152723305 extends the lower operating limit to -40°C compared to the KS302J2's unspecified lower limit. This provides broader temperature coverage without compromising the 135°C upper limit shared by both components.