WW1AFT4R00 Equivalent & Substitute Parts

Part Overview

The WW1AFT4R00 is a 4 Ohms ±1% 1W axial wirewound through-hole resistor manufactured by Stackpole Electronics Inc. This moisture-resistant component is designed for applications requiring precision resistive elements with stable performance across extended temperature ranges. The part maintains Active product status with 902 units currently in stock. Substitute parts are identified when equivalent electrical specifications, mechanical compatibility, and regulatory compliance can be maintained across alternative manufacturers.

Substiute Parts

WW1AFT4R00

Stackpole Electronics IncIn Stock: 966WW1AFT4R00 Datasheet

Current PartRFQ

41F4R0E

OhmiteIn Stock: 163941F4R0E Datasheet

DirectRFQ

RS01A4R000FE70

Vishay DaleIn Stock: 1611RS01A4R000FE70 Datasheet

DirectRFQ

ALSR014R000FE12

Vishay DaleIn Stock: 860ALSR014R000FE12 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the WW1AFT4R00 are qualified based on the following criteria:

Electrical equivalence requires matching resistance value (4 Ohms), tolerance (±1%), power rating (1W), composition (wirewound), and temperature coefficient (±50ppm/°C). Mechanical compatibility is established through identical axial package configuration with two terminations. Regulatory compliance includes ROHS3 certification and EAR99 ECCN classification. All substitute parts maintain Active product status and are available in production quantities.

The three qualified substitutes are:

41F4R0E (Ohmite) — Direct electrical equivalent with wirewound composition and matching specifications, available in Bulk packaging.

RS01A4R000FE70 (Vishay Dale) — Direct electrical equivalent with moisture-resistant features and ROHS3 compliance, available in Cut Tape packaging.

ALSR014R000FE12 (Vishay Dale) — Manufacturer-recommended substitute with moisture-resistant features and ROHS3 compliance, available in Bulk packaging.

Parameter Comparison

Engineering Selection Recommendations

All three substitute parts maintain electrical and mechanical equivalence to the WW1AFT4R00. Selection among substitutes should be based on packaging requirements and availability:

41F4R0E is suitable for applications where Bulk packaging is acceptable and standard RoHS compliance meets regulatory requirements.

RS01A4R000FE70 is appropriate for applications requiring Cut Tape packaging and ROHS3 certification with moisture-resistant features.

ALSR014R000FE12 is the manufacturer-recommended option, offering ROHS3 compliance and moisture-resistant construction in Bulk packaging, with dimensional compatibility closest to the original part.

All substitutes carry Active product status and maintain the specified temperature coefficient and tolerance specifications required for precision circuit applications.

Frequently Asked Questions (FAQ)

Q: Can 41F4R0E replace WW1AFT4R00 in all applications?

A: Yes, 41F4R0E meets all electrical specifications (4 Ohms, ±1%, 1W, ±50ppm/°C) and maintains axial package compatibility. Physical dimensions differ slightly (0.126" Dia x 0.437" L versus 0.110" Dia x 0.420" L), which may affect board layout in space-constrained designs.

Q: What is the difference between RS01A4R000FE70 and ALSR014R000FE12?

A: Both are Vishay Dale products with identical electrical specifications and ROHS3 compliance. RS01A4R000FE70 is supplied in Cut Tape packaging, while ALSR014R000FE12 is supplied in Bulk packaging. RS01A4R000FE70 has a smaller diameter (0.094" versus 0.110"), while ALSR014R000FE12 maintains closer dimensional alignment to the original WW1AFT4R00.

Q: Are all substitutes moisture-resistant?

A: WW1AFT4R00, RS01A4R000FE70, and ALSR014R000FE12 are specified as moisture-resistant. 41F4R0E does not list moisture-resistant features in the provided specifications.

Q: Do operating temperature ranges differ among substitutes?

A: WW1AFT4R00 operates from -55°C to 350°C. RS01A4R000FE70 and ALSR014R000FE12 operate from -65°C to 250°C. 41F4R0E operating temperature range is not specified in available data.

Q: Which substitute offers the best dimensional match?

A: ALSR014R000FE12 provides the closest dimensional compatibility at 0.110" Dia x 0.406" L, matching the diameter of the original WW1AFT4R00 and maintaining minimal length variation.