ROX2SF1R8 Equivalent & Substitute Parts

Part Overview

The ROX2SF1R8 is a 1.8 Ohms ±1% 2W through-hole resistor manufactured by TE Connectivity Passive Product. This axial metal oxide film resistor features flame-proof and pulse-withstanding characteristics, designed for safety-critical applications. The component is classified as obsolete, necessitating identification of active equivalent parts to maintain design continuity and ensure supply chain availability for new production and repair applications.

Substiute Parts

ROX2SF1R8

TE Connectivity Passive ProductIn Stock: 1102ROX2SF1R8 Datasheet

Current PartRFQ

FMP200FRF52-1R8

YAGEOIn Stock: 1111FMP200FRF52-1R8 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ROX2SF1R8 is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

• Resistance value: 1.8 Ohms
• Tolerance: ±1%
• Power rating: 2W
• Package type: Axial through-hole configuration
• Number of terminations: 2
• Flame-proof and safety features

Acceptable Variation Parameters:

• Composition: Metal oxide film or metal film acceptable (both provide equivalent electrical performance in this application)
• Temperature coefficient: Substitute may differ from original specification
• Operating temperature range: Substitute may have narrower range if minimum and maximum bounds remain within application requirements
• Physical dimensions: Axial package dimensions may vary within standard through-hole compatibility

The FMP200FRF52-1R8 from YAGEO meets all mandatory matching parameters and is classified as an active product, providing direct functional equivalence to the obsolete ROX2SF1R8.

Parameter Comparison

Engineering Selection Recommendations

The FMP200FRF52-1R8 is the direct equivalent substitute for the obsolete ROX2SF1R8. Selection is based on the following engineering criteria:

Electrical Equivalence: Both components provide identical resistance (1.8 Ohms), tolerance (±1%), and power rating (2W). The metal film composition of the substitute delivers superior temperature coefficient performance (±100ppm/°C versus ±350ppm/°C), resulting in improved stability across operating conditions.

Thermal Considerations: The FMP200FRF52-1R8 operates within the range of -55°C to 155°C. Applications requiring operation above 155°C must evaluate thermal requirements against the substitute's maximum operating temperature. For applications within the -55°C to 155°C envelope, the substitute provides full functional equivalence.

Compliance Status: The FMP200FRF52-1R8 is ROHS3 compliant and REACH unaffected, meeting current regulatory requirements for new production. The active product status ensures ongoing availability and supply chain continuity.

Physical Integration: The substitute features smaller axial dimensions (3.90mm x 9.00mm versus 5.00mm x 12.00mm). PCB layout verification is required to confirm mechanical fit within existing board designs. Both components maintain standard axial through-hole termination compatibility.

Safety Features: Both components provide flame-proof and safety certifications. The substitute maintains the safety-critical feature set required for the application.

Frequently Asked Questions (FAQ)

Q: Can the FMP200FRF52-1R8 directly replace the ROX2SF1R8 in existing designs?

A: The FMP200FRF52-1R8 provides direct electrical equivalence for the ROX2SF1R8 across all critical parameters: resistance, tolerance, power rating, and safety features. Physical dimensions differ, requiring PCB layout verification to confirm mechanical fit within existing board designs. Both components use standard axial through-hole termination.

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

A: Both compositions are acceptable for this substitution. Metal film composition, used in the FMP200FRF52-1R8, provides superior temperature coefficient stability (±100ppm/°C) compared to the metal oxide film of the original part (±350ppm/°C). This results in improved resistance stability across temperature variations.

Q: Does the operating temperature range difference affect substitution suitability?

A: The FMP200FRF52-1R8 operates from -55°C to 155°C, compared to the original -55°C to 200°C range. For applications operating within -55°C to 155°C, the substitute provides full equivalence. Applications requiring operation above 155°C require thermal analysis to determine suitability.

Q: Are there packaging differences between the two parts?

A: The ROX2SF1R8 is supplied in standard packaging, while the FMP200FRF52-1R8 is available in Tape & Reel (TR) format. Both maintain axial through-hole package type. Tape & Reel packaging is standard for active production components and provides advantages for automated assembly processes.

Q: What compliance certifications does the substitute carry?

A: The FMP200FRF52-1R8 is ROHS3 compliant and REACH unaffected. These certifications meet current regulatory requirements for electronic components in new production applications.

Q: Why is the ROX2SF1R8 classified as obsolete?

A: Obsolete status indicates the component is no longer manufactured by TE Connectivity. The FMP200FRF52-1R8 from YAGEO is classified as active, ensuring continued availability and supply chain support for ongoing production requirements.

Q: Are physical dimensions critical for substitution?

A: Physical dimensions should be verified against PCB layout constraints. The substitute (3.90mm x 9.00mm) is smaller than the original (5.00mm x 12.00mm). In most through-hole applications, smaller dimensions present no compatibility issues. PCB design review is recommended to confirm fit within existing board layouts.