ROX1SF47K Equivalent & Substitute Parts

Part Overview

The ROX1SF47K is a 47 kOhms ±1% 1W 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 product is currently obsolete, necessitating identification of functionally equivalent alternatives that maintain the same electrical and mechanical specifications for continued system support and new designs.

Substiute Parts

ROX1SF47K

TE Connectivity Passive ProductIn Stock: 1055ROX1SF47K Datasheet

Current PartRFQ

FMF1WSFRF52-47K

YAGEOIn Stock: 1100FMF1WSFRF52-47K Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ROX1SF47K is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Requirements:

• Resistance value: 47 kOhms (exact match)
• Tolerance: ±1% (exact match)
• Power rating: 1W (exact match)

Mechanical Equivalence Requirements:

• Package type: Axial through-hole configuration
• Physical dimensions compatible with PCB layouts designed for the original part
• Two terminations (standard axial lead configuration)

Functional Equivalence Requirements:

• Flame-proof characteristic
• Safety-rated composition
• Operating temperature range that encompasses or exceeds -55°C ~ 130°C

The substitute part FMF1WSFRF52-47K from YAGEO meets all electrical and mechanical requirements. While the substitute uses metal film composition instead of metal oxide film, and exhibits different temperature coefficient and maximum operating temperature specifications, it satisfies the core functional parameters for 47 kOhms ±1% 1W axial resistor applications.

Parameter Comparison

Engineering Selection Recommendations

The FMF1WSFRF52-47K from YAGEO is the qualified substitute for the obsolete ROX1SF47K. Selection of this substitute is supported by the following factors:

Electrical Compatibility: Both parts provide identical resistance value (47 kOhms) and tolerance (±1%) at the same power rating (1W), ensuring direct functional replacement in circuit designs.

Mechanical Compatibility: Both parts utilize axial through-hole packaging with two terminations. Physical dimensions are comparable, with the substitute slightly smaller (3.30mm x 9.00mm versus 3.50mm x 10.00mm), which does not preclude PCB layout compatibility for standard axial resistor footprints.

Product Status and Availability: The substitute part maintains active product status with documented inventory availability, addressing the obsolescence of the original ROX1SF47K.

Compliance and Certification: The FMF1WSFRF52-47K carries ROHS3 compliance and REACH unaffected status, meeting current regulatory requirements for electronic component procurement.

Performance Characteristics: The substitute exhibits superior temperature coefficient stability (±100ppm/°C versus ±350ppm/°C) and extended maximum operating temperature (155°C versus 130°C), providing enhanced performance margins in temperature-sensitive applications.

Frequently Asked Questions (FAQ)

Q: Can the FMF1WSFRF52-47K directly replace the ROX1SF47K in existing designs?

A: Yes. Both parts provide 47 kOhms ±1% at 1W with axial through-hole packaging. The substitute's slightly smaller physical dimensions do not prevent installation in standard axial resistor footprints. Verify PCB layout clearances if space constraints exist.

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

A: Metal oxide film (ROX1SF47K) and metal film (FMF1WSFRF52-47K) are different resistive element technologies. Both achieve the specified 47 kOhms ±1% rating. The metal film composition in the substitute provides lower temperature coefficient (±100ppm/°C versus ±350ppm/°C), resulting in better stability across temperature variations.

Q: Does the substitute part meet safety and flame-proof requirements?

A: Yes. The FMF1WSFRF52-47K is specified as flame-proof and safety-rated, matching the functional safety characteristics of the original ROX1SF47K.

Q: Are there packaging differences between the original and substitute?

A: The original ROX1SF47K is specified with standard packaging notation. The substitute FMF1WSFRF52-47K is supplied in Tape & Reel (TR) format, which is standard for active production components. Both are axial through-hole parts suitable for manual or automated assembly.

Q: What is the operating temperature range difference?

A: The ROX1SF47K operates from -55°C to 130°C. The FMF1WSFRF52-47K extends to 155°C maximum. For applications operating within the original -55°C to 130°C range, both parts are functionally equivalent. Applications requiring operation above 130°C benefit from the substitute's extended range.

Q: Is the substitute RoHS compliant?

A: Yes. The FMF1WSFRF52-47K is ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards for electronic component procurement.