PW222J2 Equivalent & Substitute Parts

Part Overview

The PW222J2 is an NTC thermistor manufactured by Littelfuse Inc., designed as a temperature sensor with a nominal resistance of 2.252kΩ at 25°C. This component is classified as obsolete, which necessitates identification of functionally equivalent alternatives for ongoing applications. The PW222J2 features a bead configuration with epoxy packaging and is suitable for free-hanging mounting applications with a maximum operating temperature of 120°C and power rating of 30mW.

Substiute Parts

PW222J2

Littelfuse Inc.In Stock: 899PW222J2 Datasheet

Current PartRFQ

701033

TE Connectivity Measurement SpecialtiesIn Stock: 1135701033 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the PW222J2 is determined by the following critical parameters:

• Resistance value at 25°C must be 2.252kΩ
• B value (B0/50) must be within the range of 3891K to 3892K
• Package configuration must be bead type
• Mounting type must support free-hanging installation
• RoHS3 compliance must be maintained
• Operating temperature range must accommodate the application requirements

The substitute part 701033 meets these criteria with matching resistance specifications and compatible thermal characteristics.

Parameter Comparison

Engineering Selection Recommendations

The 701033 from TE Connectivity Measurement Specialties is the qualified substitute for the obsolete PW222J2. Both components maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment. The 701033 offers an extended operating temperature range (-55°C to 150°C) compared to the PW222J2 (120°C maximum), providing greater thermal flexibility for applications. The resistance tolerance of the 701033 (±0.1°C) is tighter than the PW222J2 (±0.5°C), offering improved measurement precision. The B value differential between the two parts (3891K versus 3892K) is negligible for practical thermistor applications. Lead wire length differs between the two components; the 701033 provides extended leads at 3.00" (76.20mm) versus the PW222J2 at 1.50" (38.00mm), which may require mechanical accommodation in the application design.

Frequently Asked Questions (FAQ)

Q: Can the 701033 directly replace the PW222J2 without circuit modifications?

A: The 701033 is electrically equivalent based on resistance and B value specifications. However, the extended lead wire length (3.00" versus 1.50") may require mechanical adjustment in the mounting configuration. Verify that the application can accommodate the longer leads or that they can be trimmed if necessary.

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

A: The B value determines the thermistor's temperature-resistance relationship. A difference of 1K between the two parts represents a negligible variance (0.026%) and will not produce measurable differences in temperature sensing accuracy for typical applications.

Q: Does the tighter resistance tolerance of the 701033 affect compatibility?

A: The 701033 features a resistance tolerance of ±0.1°C compared to the PW222J2 at ±0.5°C. This represents improved precision and is fully compatible with applications designed for the PW222J2, as the tighter tolerance is a performance enhancement rather than a limitation.

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

A: Both the PW222J2 and 701033 are ROHS3 compliant and REACH unaffected. No compliance barriers exist for substitution from a regulatory standpoint.

Q: Why is the operating temperature range of the 701033 wider than the PW222J2?

A: The 701033 is rated for -55°C to 150°C, while the PW222J2 is limited to 120°C maximum. The PW222J2's lower maximum temperature reflects its obsolete design specification. The 701033's extended range provides greater application flexibility without compromising performance within the PW222J2's original operating window.