ROX1SF5K1 Equivalent & Substitute Parts

Part Overview

The ROX1SF5K1 is a 5.1 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 applications requiring safety-rated components. The product is currently obsolete, necessitating identification of equivalent substitute parts that maintain the same electrical and mechanical specifications for continued system support and new designs.

Substiute Parts

ROX1SF5K1

TE Connectivity Passive ProductIn Stock: 817ROX1SF5K1 Datasheet

Current PartRFQ

FMF1WSFRF52-5K1

YAGEOIn Stock: 1037FMF1WSFRF52-5K1 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ROX1SF5K1 is determined by strict equivalence across the following critical parameters:

Electrical Specifications:

• Resistance value: 5.1 kOhms
• Tolerance: ±1%
• Power rating: 1W

Mechanical Specifications:

• Package configuration: Axial through-hole
• Number of terminations: 2
• Physical form factor compatibility

Safety & Compliance:

• Flame-proof rating
• Safety certification features

The substitute part FMF1WSFRF52-5K1 meets all mandatory electrical and mechanical requirements. While composition differs (metal film versus metal oxide film) and temperature coefficient varies, these differences remain within acceptable substitution parameters for the specified resistance, tolerance, and power rating classification.

Parameter Comparison

Engineering Selection Recommendations

The FMF1WSFRF52-5K1 serves as a direct electrical equivalent to the obsolete ROX1SF5K1. Both components provide identical resistance, tolerance, and power rating specifications required for circuit functionality.

Product Status Consideration: The ROX1SF5K1 is obsolete with no ongoing manufacturing. The FMF1WSFRF52-5K1 maintains active production status, ensuring long-term availability and supply chain continuity.

Compliance Status: The FMF1WSFRF52-5K1 carries ROHS3 compliance certification, meeting current regulatory requirements for electronic component manufacturing and distribution.

Physical Compatibility: Both components utilize axial through-hole packaging with identical termination configuration (2 leads). Dimensional differences are minor and do not affect PCB layout or mechanical mounting in standard axial resistor footprints.

Frequently Asked Questions (FAQ)

Q: Can the FMF1WSFRF52-5K1 directly replace the ROX1SF5K1 in existing designs?

A: Yes. Both components share identical electrical specifications: 5.1 kOhms resistance, ±1% tolerance, and 1W power rating. The axial through-hole package configuration is mechanically compatible with standard PCB layouts designed for the ROX1SF5K1.

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

A: Composition differences do not affect substitution validity for this resistance and power rating class. Both compositions deliver the specified 5.1 kOhms ±1% at 1W. The metal film composition in the FMF1WSFRF52-5K1 provides a lower temperature coefficient (±100ppm/°C versus ±350ppm/°C), which represents improved stability across temperature variations.

Q: Are there dimensional compatibility concerns?

A: The FMF1WSFRF52-5K1 is slightly smaller (0.130" Dia x 0.354" L) compared to the ROX1SF5K1 (0.138" Dia x 0.394" L). Both fit standard axial resistor footprints. The smaller dimensions of the substitute part provide additional PCB layout flexibility without compromising electrical performance.

Q: Does the extended operating temperature range of the FMF1WSFRF52-5K1 affect substitution?

A: The FMF1WSFRF52-5K1 operates across -55°C ~ 155°C, exceeding the ROX1SF5K1 range of -55°C ~ 130°C. This extended range does not create compatibility issues and provides additional operational margin for applications approaching the upper temperature limit of the original specification.

Q: What is the impact of ROHS3 compliance on the substitute part?

A: ROHS3 compliance indicates the FMF1WSFRF52-5K1 meets current environmental and material restriction standards for electronic components. This certification supports regulatory compliance for new designs and systems subject to ROHS requirements.

Q: Are the safety and flame-proof features equivalent between both parts?

A: Both components carry flame-proof and safety designations. The ROX1SF5K1 additionally specifies pulse-withstanding capability. For applications requiring pulse-withstanding performance, circuit-level validation is necessary to confirm the FMF1WSFRF52-5K1 meets specific pulse energy and frequency requirements.