ROX1SF56K Equivalent & Substitute Parts

Part Overview

The ROX1SF56K is a 56 kOhms ±1% 1W through-hole resistor manufactured by TE Connectivity Passive Product in the ROX/Neohm series. This axial 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 substitute components for ongoing applications and new designs. Active alternatives with matching or compatible electrical specifications are available from both TE Connectivity and alternative manufacturers.

Substiute Parts

ROX1SF56K

TE Connectivity Passive ProductIn Stock: 935ROX1SF56K Datasheet

Current PartRFQ

ROX1SJ56K

TE Connectivity Passive ProductIn Stock: 10496ROX1SJ56K Datasheet

SimilarRFQ

FMF1WSFRF52-56K

YAGEOIn Stock: 1184FMF1WSFRF52-56K Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ROX1SF56K is determined by the following critical parameters:

Primary Matching Criteria:

• Resistance value: 56 kOhms (exact match required)
• Power rating: 1W (exact match required)
• Package type: Axial (exact match required)
• Tolerance: ±1% or tighter (equal or better tolerance acceptable)
• Composition: Metal Oxide Film or Metal Film (both acceptable for this application)
• Operating temperature range: Must encompass -55°C ~ 130°C minimum
• Features: Flame Proof and Safety characteristics required

Acceptable Variations:

• Temperature coefficient may differ if within acceptable operating range
• Physical dimensions may vary slightly within axial package constraints
• Packaging format (Cut Tape, Tape & Reel) does not affect electrical compatibility

Substitute parts must maintain the 56 kOhms resistance value, 1W power rating, and axial configuration. Tolerance of ±1% or better ensures compatibility with circuits designed for the original part's precision specifications.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: FMF1WSFRF52-56K (YAGEO)

The FMF1WSFRF52-56K is the preferred direct equivalent for the ROX1SF56K. Both components share identical resistance (56 kOhms), tolerance (±1%), power rating (1W), and axial package configuration. The YAGEO part features metal film composition with superior temperature coefficient performance (±100ppm/°C versus ±350ppm/°C), providing enhanced stability across the operating range. The extended operating temperature range (-55°C ~ 155°C) exceeds the original specification. The FMF1WSFRF52-56K maintains active product status with ROHS3 compliance and REACH unaffected certification, ensuring long-term availability and regulatory compliance.

Secondary Substitute: ROX1SJ56K (TE Connectivity)

The ROX1SJ56K provides a same-manufacturer alternative within the ROX/Neohm series. This component maintains identical resistance, power rating, and axial package type with matching operating temperature range and temperature coefficient. The tolerance specification is ±5%, which is wider than the original ±1% specification. The ROX1SJ56K is active product status with ROHS3 compliance. This substitute is suitable for applications where ±5% tolerance is acceptable and same-manufacturer sourcing is preferred.

Selection Criteria:

• Use FMF1WSFRF52-56K when ±1% tolerance and superior temperature stability are required
• Use ROX1SJ56K when same-manufacturer continuity and ±5% tolerance are acceptable
• Both substitutes maintain flame-proof and safety-rated characteristics
• Both substitutes are active products with established supply chains

Frequently Asked Questions (FAQ)

Q: Can ROX1SJ56K replace ROX1SF56K in all applications?

A: ROX1SJ56K is electrically compatible for most applications. The primary difference is tolerance specification: ROX1SJ56K is ±5% versus ROX1SF56K at ±1%. Applications requiring precision circuit tuning or tight tolerance specifications should use FMF1WSFRF52-56K instead.

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

A: Both compositions are acceptable for this application. Metal film (FMF1WSFRF52-56K) provides superior temperature coefficient stability (±100ppm/°C). Metal oxide film (ROX1SF56K, ROX1SJ56K) provides pulse-withstanding characteristics. Selection depends on application requirements for temperature stability versus pulse handling.

Q: Are the physical dimensions compatible between substitutes?

A: All three parts use axial package configuration. ROX1SF56K and ROX1SJ56K share identical dimensions (0.138" Dia x 0.394" L). FMF1WSFRF52-56K has slightly different dimensions (0.130" Dia x 0.354" L) but remains compatible with standard axial component footprints and through-hole mounting.

Q: Does packaging format affect electrical performance?

A: No. Packaging format (Cut Tape, Tape & Reel, or bulk) affects only handling and assembly processes. Electrical specifications and performance are identical regardless of packaging format.

Q: Are all substitutes RoHS compliant?

A: FMF1WSFRF52-56K and ROX1SJ56K are both ROHS3 compliant. RoHS status for ROX1SF56K is not specified in available documentation. For applications requiring RoHS compliance certification, use FMF1WSFRF52-56K or ROX1SJ56K.

Q: What is the temperature coefficient significance?

A: Temperature coefficient indicates resistance value change per degree Celsius. FMF1WSFRF52-56K (±100ppm/°C) exhibits less resistance drift across temperature variations compared to ROX1SF56K and ROX1SJ56K (±350ppm/°C). Applications with strict tolerance requirements across temperature ranges benefit from the lower temperature coefficient.

Q: Can I use these parts interchangeably in existing designs?

A: Yes, for the same-package axial configuration. Verify tolerance requirements: if ±1% is specified, use FMF1WSFRF52-56K or ROX1SF56K. If ±5% is acceptable, ROX1SJ56K is suitable. All three parts maintain flame-proof and safety-rated characteristics required for safety-critical applications.