ROX1SF1K0 Equivalent & Substitute Parts

Part Overview

The ROX1SF1K0 is a 1 kOhms ±1% 1W through-hole axial resistor manufactured by TE Connectivity Passive Product. This metal oxide film resistor features flame-proof and pulse-withstanding characteristics with a safety rating. The part is classified as obsolete, necessitating identification of equivalent and substitute components for ongoing applications and new designs. Active alternatives with compatible electrical and mechanical specifications are available from TE Connectivity and other manufacturers.

Substiute Parts

ROX1SF1K0

TE Connectivity Passive ProductIn Stock: 867ROX1SF1K0 Datasheet

Current PartRFQ

ROX1SJ1K0

TE Connectivity Passive ProductIn Stock: 8665ROX1SJ1K0 Datasheet

SimilarRFQ

FMF1WSFRF52-1K

YAGEOIn Stock: 977FMF1WSFRF52-1K Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ROX1SF1K0 is determined by the following critical parameters:

Electrical Compatibility:

• Resistance value: 1 kOhms (exact match required)
• Power rating: 1W (minimum requirement)
• Tolerance: ±1% or tighter (acceptable for direct substitution)
• Composition: Metal oxide film or metal film (functionally equivalent for this application)

Mechanical Compatibility:

• Package type: Axial (required for through-hole mounting)
• Physical dimensions: 0.138" Dia x 0.394" L or equivalent within manufacturing tolerances
• Number of terminations: 2 (standard for axial resistors)

Environmental & Safety:

• Operating temperature range: -55°C ~ 130°C minimum
• Features: Flame proof and safety rated (required for safety-critical applications)

Substitute parts must satisfy all electrical parameters and maintain mechanical compatibility with existing PCB layouts and assembly processes.

Parameter Comparison

Engineering Selection Recommendations

ROX1SJ1K0 (TE Connectivity): This part is the primary substitute for the ROX1SF1K0. Both components are manufactured by TE Connectivity within the same ROX/Neohm series and share identical mechanical dimensions and operating temperature specifications. The ROX1SJ1K0 is currently in active production status with high inventory availability (8614 pcs). The tolerance difference (±5% versus ±1%) represents the primary electrical distinction. This substitute is suitable for applications where the ±1% tolerance requirement can be relaxed to ±5%. The part is RoHS3 compliant and REACH unaffected.

FMF1WSFRF52-1K (YAGEO): This part provides an alternative from a different manufacturer with equivalent electrical performance at ±1% tolerance. The FMF1WSFRF52-1K utilizes metal film composition instead of metal oxide film, resulting in superior temperature coefficient performance (±100ppm/°C versus ±350ppm/°C) and extended operating temperature range (-55°C ~ 155°C). Physical dimensions are slightly smaller (0.130" Dia x 0.354" L versus 0.138" Dia x 0.394" L), which may require PCB layout verification for existing designs. The part is active in production with RoHS3 compliance and REACH unaffected status.

Selection between ROX1SJ1K0 and FMF1WSFRF52-1K depends on tolerance requirements, temperature coefficient performance needs, and PCB layout constraints.

Frequently Asked Questions (FAQ)

Q: Can ROX1SJ1K0 directly replace ROX1SF1K0 in all applications?

A: ROX1SJ1K0 provides direct mechanical and thermal compatibility with identical package dimensions and operating temperature range. The tolerance specification differs (±5% versus ±1%). Direct substitution is valid for applications where ±5% tolerance is acceptable. Applications requiring ±1% tolerance precision require evaluation of circuit performance impact.

Q: What is the primary difference between ROX1SJ1K0 and FMF1WSFRF52-1K?

A: Both parts meet the 1 kOhms ±1% 1W axial resistor specification. Key differences include: (1) Composition: ROX1SJ1K0 uses metal oxide film while FMF1WSFRF52-1K uses metal film; (2) Temperature coefficient: FMF1WSFRF52-1K offers superior stability (±100ppm/°C versus ±350ppm/°C); (3) Physical size: FMF1WSFRF52-1K is slightly smaller; (4) Manufacturer: TE Connectivity versus YAGEO.

Q: Are there packaging differences between these substitutes?

A: ROX1SF1K0 and ROX1SJ1K0 share identical axial package dimensions (0.138" Dia x 0.394" L). FMF1WSFRF52-1K has slightly reduced dimensions (0.130" Dia x 0.354" L). For existing PCB designs with tight component spacing, verify that the smaller FMF1WSFRF52-1K dimensions do not create clearance issues. Both TE Connectivity parts are mechanically interchangeable without layout modification.

Q: Which substitute offers the best long-term availability?

A: ROX1SJ1K0 is currently in active production status with substantial inventory (8614 pcs). FMF1WSFRF52-1K is also active with 944 pcs in stock. Both parts are from established manufacturers with ongoing production. ROX1SJ1K0 represents the lowest-risk substitution path due to identical series lineage and TE Connectivity manufacturing continuity.

Q: Do all substitutes meet the same safety and compliance requirements?

A: All three parts (ROX1SF1K0, ROX1SJ1K0, and FMF1WSFRF52-1K) are flame-proof and safety-rated. ROX1SJ1K0 and FMF1WSFRF52-1K are RoHS3 compliant and REACH unaffected. Compliance certifications are equivalent across all active parts.

Q: What is the impact of temperature coefficient differences?

A: ROX1SF1K0 and ROX1SJ1K0 share ±350ppm/°C temperature coefficient. FMF1WSFRF52-1K offers ±100ppm/°C, representing 3.5x better temperature stability. For precision analog circuits or applications with wide temperature operation, the FMF1WSFRF52-1K provides superior performance. For general-purpose applications, the difference is typically negligible.