ROX1SF12K Equivalent & Substitute Parts

Part Overview

The ROX1SF12K is a 12 kOhms ±1% 1W through-hole axial resistor manufactured by TE Connectivity Passive Product. This component features metal oxide film construction with flame-proof and pulse-withstanding characteristics, designed for applications requiring precision resistance values and high reliability. The part is classified as obsolete, necessitating identification of equivalent substitute components that maintain functional compatibility while offering active product status and continued availability.

Substiute Parts

ROX1SF12K

TE Connectivity Passive ProductIn Stock: 980ROX1SF12K Datasheet

Current PartRFQ

ROX1SJ12K

TE Connectivity Passive ProductIn Stock: 3019ROX1SJ12K Datasheet

SimilarRFQ

FMF1WSFRF52-12K

YAGEOIn Stock: 882FMF1WSFRF52-12K Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ROX1SF12K is determined by the following critical parameters: resistance value (12 kOhms), power rating (1W), package configuration (axial through-hole), and operating temperature range compatibility. The tolerance specification (±1%) and composition type (metal oxide film) define the primary performance class.

Two substitute parts are identified based on these criteria:

ROX1SJ12K (TE Connectivity Passive Product): Maintains identical resistance value, power rating, package type, and operating temperature range. Differs in tolerance specification (±5% versus ±1%) and product status (active). Represents a relaxed-tolerance alternative within the same manufacturer series.

FMF1WSFRF52-12K (YAGEO): Maintains identical resistance value, power rating, package type, and tolerance specification (±1%). Differs in composition (metal film versus metal oxide film), temperature coefficient (±100ppm/°C versus ±350ppm/°C), and maximum operating temperature (155°C versus 130°C). Represents a direct functional equivalent from an alternative manufacturer with enhanced temperature performance.

Parameter Comparison

Engineering Selection Recommendations

ROX1SJ12K Selection Criteria: This substitute is appropriate for applications where tolerance relaxation from ±1% to ±5% is acceptable and where the operating temperature range does not exceed 130°C. The component maintains identical physical dimensions, power rating, and thermal characteristics as the original ROX1SF12K. Active product status ensures continued availability and supply chain stability. ROHS3 compliance supports modern manufacturing and environmental standards.

FMF1WSFRF52-12K Selection Criteria: This substitute is appropriate for applications requiring ±1% tolerance precision matching the original specification. The metal film composition provides superior temperature coefficient performance (±100ppm/°C versus ±350ppm/°C), resulting in improved stability across temperature variations. Extended operating temperature range to 155°C accommodates higher-temperature environments. Active product status and ROHS3 compliance ensure long-term availability. Physical dimensions differ slightly (0.130" Dia x 0.354" L versus 0.138" Dia x 0.394" L), requiring verification of mechanical fit within the target application.

Both substitutes are suitable for direct replacement in applications where the specified parameter differences are compatible with circuit requirements.

Frequently Asked Questions (FAQ)

Q: Can ROX1SJ12K replace ROX1SF12K in all applications?

A: ROX1SJ12K is suitable for replacement where tolerance relaxation from ±1% to ±5% does not compromise circuit performance. Applications requiring precision tolerance matching require FMF1WSFRF52-12K or equivalent ±1% tolerance components.

Q: What is the primary difference between ROX1SJ12K and FMF1WSFRF52-12K?

A: ROX1SJ12K maintains metal oxide film composition and ±350ppm/°C temperature coefficient with ±5% tolerance. FMF1WSFRF52-12K provides metal film composition with superior ±100ppm/°C temperature coefficient and ±1% tolerance, supporting higher-precision applications and extended temperature operation to 155°C.

Q: Are physical dimensions identical across all three parts?

A: ROX1SF12K and ROX1SJ12K share identical dimensions (0.138" Dia x 0.394" L). FMF1WSFRF52-12K has slightly smaller dimensions (0.130" Dia x 0.354" L). Mechanical fit verification is required when substituting with FMF1WSFRF52-12K.

Q: Do all substitute parts meet current compliance standards?

A: ROX1SJ12K and FMF1WSFRF52-12K are both ROHS3 compliant. FMF1WSFRF52-12K carries REACH Unaffected status. Original ROX1SF12K compliance status is not specified in available documentation.

Q: What is the impact of temperature coefficient differences?

A: ROX1SF12K and ROX1SJ12K operate at ±350ppm/°C, while FMF1WSFRF52-12K operates at ±100ppm/°C. Lower temperature coefficient indicates superior resistance stability across temperature variations, beneficial for precision analog circuits and temperature-sensitive applications.

Q: Can FMF1WSFRF52-12K operate at the full temperature range of ROX1SF12K?

A: FMF1WSFRF52-12K exceeds the original operating range, functioning from -55°C to 155°C compared to ROX1SF12K's -55°C to 130°C. This extended range provides additional operational margin in high-temperature environments.