WW1FT100R Equivalent & Substitute Parts

Part Overview

The WW1FT100R is a 100 Ohm, 1% tolerance, 1W axial wirewound through-hole resistor manufactured by Stackpole Electronics Inc. This component is classified as Active and is designed for applications requiring precision resistive elements with moisture resistance capabilities. Equivalent and substitute parts are identified when component availability is limited, supply chain disruptions occur, or design flexibility permits alternative manufacturers while maintaining electrical and mechanical compatibility.

Substiute Parts

WW1FT100R

Stackpole Electronics IncIn Stock: 758WW1FT100R Datasheet

Current PartRFQ

41F100E

OhmiteIn Stock: 95441F100E Datasheet

MFR RecommendedRFQ

RS01A100R0FE70

Vishay DaleIn Stock: 4596RS01A100R0FE70 Datasheet

MFR RecommendedRFQ

WHB100FET

OhmiteIn Stock: 2289WHB100FET Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the WW1FT100R are qualified based on the following criteria:

Electrical Parameters (Must Match):

• Resistance value: 100 Ohms
• Tolerance: ±1%
• Power rating: 1W
• Composition: Wirewound
• Temperature coefficient: ±20ppm/°C

Mechanical Parameters (Must Match):

• Package type: Axial through-hole
• Number of terminations: 2

Compliance Parameters (Preferred):

• RoHS3 compliance
• REACH unaffected status
• ECCN classification: EAR99

All three substitute parts meet the core electrical and mechanical requirements. Variations in physical dimensions, operating temperature ranges, and packaging formats (Tape & Reel vs. Cut Tape) do not affect functional substitution but may impact assembly and storage considerations.

Parameter Comparison

Engineering Selection Recommendations

All three substitute parts are Active status components and meet the core electrical specifications of the WW1FT100R. Selection among these alternatives should be based on the following considerations:

RS01A100R0FE70 (Vishay Dale): This part maintains ROHS3 compliance, REACH unaffected status, and moisture resistance equivalent to the primary part. The operating temperature range extends to -65°C, providing broader low-temperature capability. This part is available in the highest quantity (4510 pcs) and is supplied in Cut Tape format.

41F100E (Ohmite): This part meets RoHS compliance and maintains the same temperature coefficient. The operating temperature range is limited to -55°C ~ 275°C. Moisture resistance is not specified. This part is available in 858 pcs inventory.

WHB100FET (Ohmite): This part maintains ROHS3 compliance and moisture resistance is not specified. The operating temperature range is the most restricted at -55°C ~ 150°C. This part is available in 2245 pcs inventory and is supplied in Cut Tape format.

For applications requiring the full operating temperature range of the original part (-55°C ~ 350°C), none of the substitute parts provide equivalent upper temperature capability. Selection should prioritize application-specific temperature requirements and moisture exposure conditions.

Frequently Asked Questions (FAQ)

Q: Can the 41F100E replace the WW1FT100R in all applications?

A: The 41F100E is electrically equivalent in resistance, tolerance, power rating, and temperature coefficient. However, the operating temperature range is limited to -55°C ~ 275°C compared to the WW1FT100R's -55°C ~ 350°C. Moisture resistance is not specified for the 41F100E. Substitution is valid only for applications operating within the 41F100E's temperature range and where moisture resistance is not required.

Q: What are the physical dimension differences among these parts?

A: All parts are axial through-hole resistors but have different physical dimensions. The WW1FT100R measures 0.110" diameter x 0.375" length. The RS01A100R0FE70 is the smallest at 0.094" x 0.406". The 41F100E is the largest at 0.126" x 0.437". The WHB100FET is the shortest at 0.130" x 0.276". Physical dimensions may affect PCB layout and component spacing considerations.

Q: Is the RS01A100R0FE70 a direct replacement for the WW1FT100R?

A: The RS01A100R0FE70 matches all critical electrical parameters and maintains moisture resistance. Both parts are ROHS3 compliant and REACH unaffected. The RS01A100R0FE70 extends the low-temperature capability to -65°C but limits the upper temperature to 250°C. For applications within this temperature range, the RS01A100R0FE70 is a valid substitute.

Q: Why do the substitute parts have different operating temperature ranges?

A: Operating temperature range is determined by the resistor's construction materials and design. The WW1FT100R achieves -55°C ~ 350°C through specific material selection. Substitute parts from different manufacturers use different construction methods, resulting in different temperature capabilities. Application requirements must determine acceptable temperature range limits.

Q: Are all substitute parts RoHS compliant?

A: The WW1FT100R and RS01A100R0FE70 are ROHS3 compliant. The 41F100E is RoHS compliant (specific version not specified). The WHB100FET is ROHS3 compliant. All parts meet RoHS requirements, though the specific RoHS version may vary.

Q: What is the difference between Tape & Reel and Cut Tape packaging?

A: Tape & Reel packaging is used for automated assembly processes and provides components on a continuous reel. Cut Tape packaging provides components on tape segments cut to specific lengths. The WW1FT100R is supplied in Tape & Reel format, while RS01A100R0FE70 and WHB100FET are supplied in Cut Tape format. Packaging format affects handling and assembly method but does not impact electrical performance.