ROX1SF100R Equivalent & Substitute Parts

Part Overview

The ROX1SF100R is a 100 Ohms ±1% 1W through-hole axial resistor manufactured by TE Connectivity Passive Product. This component features metal oxide film construction with flame-proof and pulse-withstanding characteristics, designed for safety-critical applications. The product is currently obsolete, necessitating identification of functionally equivalent active alternatives to maintain design continuity and ensure component availability for new production runs and field replacements.

Substiute Parts

ROX1SF100R

TE Connectivity Passive ProductIn Stock: 745ROX1SF100R Datasheet

Current PartRFQ

FMF1WSFRF52-100R

YAGEOIn Stock: 1266FMF1WSFRF52-100R Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ROX1SF100R is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

• Resistance value: 100 Ohms
• Tolerance: ±1%
• Power rating: 1W
• Package configuration: Axial through-hole
• Number of terminations: 2
• Flame-proof and safety certifications

Acceptable Parameter Variations:

• Film composition: Metal oxide film or metal film acceptable (both provide equivalent electrical performance in this application)
• Temperature coefficient: Substitute may have improved specification (lower ppm/°C value)
• Operating temperature range: Substitute may have extended upper temperature limit
• Physical dimensions: Minor variations acceptable within standard axial resistor envelope constraints
• Product status: Active status preferred for long-term availability

The FMF1WSFRF52-100R from YAGEO meets all mandatory matching parameters and qualifies as a direct substitute for the obsolete ROX1SF100R.

Parameter Comparison

Engineering Selection Recommendations

The FMF1WSFRF52-100R is the qualified substitute for the obsolete ROX1SF100R based on the following engineering criteria:

Electrical Equivalence: Both components provide identical resistance (100 Ohms), tolerance (±1%), and power rating (1W). The FMF1WSFRF52-100R demonstrates superior temperature stability with a temperature coefficient of ±100ppm/°C compared to the original ±350ppm/°C specification, resulting in improved performance in temperature-sensitive applications.

Mechanical Compatibility: Both resistors utilize axial through-hole packaging with identical termination configuration (2 leads). The FMF1WSFRF52-100R features slightly reduced physical dimensions (0.130" Dia x 0.354" L versus 0.138" Dia x 0.394" L), which provides enhanced board layout flexibility without compromising mechanical fit in existing designs.

Regulatory and Compliance Status: The FMF1WSFRF52-100R carries active product status with ROHS3 compliance and REACH unaffected designation, ensuring long-term supply chain stability and regulatory alignment. Both components share identical ECCN (EAR99) and HTSUS (8533.21.0090) classifications.

Safety Certifications: Both components maintain flame-proof and safety certifications required for safety-critical applications. The FMF1WSFRF52-100R does not specify pulse-withstanding capability; applications requiring this feature must be evaluated against actual circuit requirements.

Thermal Performance: The extended operating temperature range of the FMF1WSFRF52-100R (-55°C ~ 155°C versus -55°C ~ 130°C) provides additional thermal margin for high-temperature environments.

Frequently Asked Questions (FAQ)

Q: Can the FMF1WSFRF52-100R be used as a direct replacement for the ROX1SF100R in existing designs?

A: Yes. Both components share identical electrical specifications (100 Ohms, ±1%, 1W) and axial through-hole packaging. The FMF1WSFRF52-100R features improved temperature stability and extended operating temperature range, making it functionally superior for most applications. Designs requiring pulse-withstanding capability should verify this feature against actual circuit stress conditions.

Q: What is the difference between metal oxide film and metal film composition?

A: Metal oxide film (ROX1SF100R) and metal film (FMF1WSFRF52-100R) are both established resistor technologies meeting the same electrical specifications in this application. Metal film composition typically provides superior temperature coefficient performance, as demonstrated by the FMF1WSFRF52-100R (±100ppm/°C versus ±350ppm/°C).

Q: Are there physical dimension differences that affect PCB layout?

A: The FMF1WSFRF52-100R is slightly smaller (0.130" Dia x 0.354" L) compared to the ROX1SF100R (0.138" Dia x 0.394" L). This dimensional reduction improves board layout flexibility and does not create compatibility issues with standard axial resistor footprints.

Q: What compliance certifications apply to the FMF1WSFRF52-100R?

A: The FMF1WSFRF52-100R is ROHS3 compliant and REACH unaffected. Both components share identical ECCN (EAR99) and HTSUS (8533.21.0090) classifications for export and tariff purposes.

Q: Is the FMF1WSFRF52-100R available in the same packaging format?

A: The FMF1WSFRF52-100R is supplied in Tape & Reel (TR) packaging, which is standard for production environments. The ROX1SF100R packaging format was not specified in the original documentation. Tape & Reel packaging is compatible with automated assembly processes and provides equivalent component functionality.

Q: What is the temperature coefficient difference and does it matter for my application?

A: The FMF1WSFRF52-100R has a temperature coefficient of ±100ppm/°C compared to the ROX1SF100R at ±350ppm/°C. This means the substitute resistor's value changes less with temperature variations. For precision analog circuits or wide temperature range applications, this improvement enhances circuit stability and accuracy.