PW503R2 Equivalent & Substitute Parts

Part Overview

The PW503R2 is an NTC thermistor manufactured by Littelfuse Inc., designed as a 50kΩ bead-type temperature sensor with epoxy packaging. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing applications and new designs requiring similar thermal sensing capabilities. The PW503R2 operates at a maximum temperature of 120°C with a power rating of 30 mW and features a 1.50" lead wire length suitable for free-hanging mounting configurations.

Substiute Parts

PW503R2

Littelfuse Inc.In Stock: 988PW503R2 Datasheet

Current PartRFQ

192-503QET-A01

Honeywell Sensing and Productivity SolutionsIn Stock: 2155192-503QET-A01 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The 192-503QET-A01 manufactured by Honeywell Sensing and Productivity Solutions qualifies as a direct substitute for the PW503R2 based on the following critical parameters:

• Identical resistance value of 50kΩ @ 25°C
• B0/50 thermal coefficient of 4138K, within acceptable tolerance of the original 4140K specification
• Matching lead wire length of 1.50" (38.00mm)
• Bead package configuration compatible with the original form factor
• Superior operating temperature range (-60°C to 150°C) that encompasses the original 120°C maximum
• Equivalent moisture sensitivity level (MSL 1 - Unlimited)
• Identical HTSUS and ECCN classifications

The 192-503QET-A01 is classified as an active product with current manufacturing status, ensuring long-term availability and supply chain continuity.

Parameter Comparison

Engineering Selection Recommendations

The 192-503QET-A01 is the recommended substitute for the obsolete PW503R2. Selection is based on:

• Matching core electrical specifications (50kΩ resistance and comparable B-value thermal coefficient)
• Active product status ensuring current availability and manufacturing support
• Full RoHS compliance meeting regulatory requirements
• Extended operating temperature range providing design margin beyond the original specification
• Identical lead wire dimensions and bead package configuration for direct mechanical compatibility
• Equivalent moisture sensitivity classification for environmental performance

Frequently Asked Questions (FAQ)

Q: Can the 192-503QET-A01 be used as a direct replacement for the PW503R2?

A: Yes. Both components share identical resistance values (50kΩ), matching lead wire lengths (1.50"), and bead package configurations. The B0/50 thermal coefficients are within 0.05% of each other (4140K vs 4138K), ensuring equivalent thermal response characteristics.

Q: What is the difference in mounting type between these components?

A: The PW503R2 is specified for free-hanging mounting, while the 192-503QET-A01 supports through-hole mounting. Both configurations accommodate the same 1.50" lead wire length, allowing installation in equivalent circuit positions.

Q: Does the 192-503QET-A01 operate within the temperature range of the original PW503R2?

A: Yes. The 192-503QET-A01 operates from -60°C to 150°C, which fully encompasses the PW503R2 operating temperature of 120°C maximum.

Q: Are both components RoHS compliant?

A: Yes. The PW503R2 is ROHS3 compliant, and the 192-503QET-A01 is RoHS compliant. Both meet regulatory requirements for hazardous substance restrictions.

Q: What is the B-value tolerance specification for the 192-503QET-A01?

A: The 192-503QET-A01 has a B-value tolerance of ±2.1%, providing defined thermal coefficient accuracy for temperature sensing applications.