PW502J2 Equivalent & Substitute Parts

Part Overview

The PW502J2 is an NTC thermistor manufactured by Littelfuse Inc., designed for temperature sensing applications. This component features a 5kΩ resistance at 25°C with a bead configuration and epoxy packaging. The part is currently classified as obsolete, making identification of suitable substitute components essential for ongoing system support and new design implementations.

Substiute Parts

PW502J2

Littelfuse Inc.In Stock: 776PW502J2 Datasheet

Current PartRFQ

701007

TE Connectivity Measurement SpecialtiesIn Stock: 2287701007 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PW502J2 is determined by the following critical parameters:

• Resistance value at 25°C: 5kΩ (primary electrical characteristic)
• B-value coefficient (B0/50): 3892K (thermal response characteristic)
• Package type: Bead configuration with free hanging mounting
• Operating temperature range capability
• Resistance tolerance and thermal stability
• RoHS and regulatory compliance status

The substitute part 701007 (TE Connectivity Measurement Specialties) meets the core electrical requirements with a matching 5kΩ resistance at 25°C and comparable B0/50 value of 3891K, representing a thermal response variation of only 1K. Both components maintain ROHS3 compliance and bead package configuration suitable for free hanging installation.

Parameter Comparison

Engineering Selection Recommendations

The 701007 from TE Connectivity Measurement Specialties serves as a direct functional substitute for the obsolete PW502J2. Both components share identical 5kΩ resistance specifications and comparable thermal coefficients, with B-value differences of less than 0.03%. The 701007 maintains active product status with ROHS3 compliance, ensuring continued availability and regulatory alignment.

The 701007 provides an extended operating temperature range (-55°C to 150°C) compared to the PW502J2 (up to 120°C), offering broader application flexibility. The substitute component features improved resistance tolerance (±0.2°C versus ±0.5°C), enhancing measurement accuracy in temperature sensing circuits.

Lead wire length differs between the two components: the PW502J2 provides 1.50" (38.00mm) while the 701007 offers 3.00" (76.20mm). This dimensional difference requires verification against mechanical installation constraints in the target application.

Frequently Asked Questions (FAQ)

Q: Can the 701007 directly replace the PW502J2 in existing designs?

A: The 701007 provides electrical equivalence with matching 5kΩ resistance and comparable B-value characteristics. Mechanical compatibility must be verified, particularly regarding lead wire length (38mm versus 76mm) and mounting space constraints.

Q: What is the significance of the B-value difference between 3892K and 3891K?

A: The 1K difference in B0/50 values represents a 0.03% variation in thermal response characteristics. This difference is negligible for most temperature sensing applications and falls within typical measurement tolerances.

Q: Why does the 701007 have a longer lead wire?

A: The 701007 features 3.00" (76.20mm) lead wires compared to the PW502J2's 1.50" (38.00mm). This extended length may require circuit board layout modifications or lead trimming to match original installation requirements.

Q: Are both components RoHS compliant?

A: Yes, both the PW502J2 and 701007 maintain ROHS3 compliance, meeting current environmental and regulatory standards for electronic component manufacturing.

Q: What is the product status difference between these components?

A: The PW502J2 is classified as obsolete, while the 701007 maintains active product status. This ensures the 701007 will remain available for procurement and receives ongoing manufacturer support.