ROX1SF330K Equivalent & Substitute Parts

Part Overview

The ROX1SF330K is a 330 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. Substitute parts maintain the core electrical specifications while offering active product status and improved availability.

Substiute Parts

ROX1SF330K

TE Connectivity Passive ProductIn Stock: 844ROX1SF330K Datasheet

Current PartRFQ

ROX1SJ330K

TE Connectivity Passive ProductIn Stock: 4472ROX1SJ330K Datasheet

SimilarRFQ

FMF1WSFRF52-330K

YAGEOIn Stock: 717FMF1WSFRF52-330K Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the ROX1SF330K are identified based on the following critical parameters that determine functional equivalence:

Primary Matching Criteria:

• Resistance value: 330 kOhms
• Power rating: 1W
• Package configuration: Axial through-hole
• Operating temperature range compatibility: -55°C minimum and 130°C maximum operation
• Safety and flame-proof characteristics

Tolerance Consideration: The ROX1SF330K specifies ±1% tolerance. The ROX1SJ330K substitute offers ±5% tolerance, which represents a relaxation of tolerance specification. This substitution is valid for applications where ±5% tolerance meets circuit requirements.

Composition Variation: The FMF1WSFRF52-330K substitute uses metal film composition instead of metal oxide film, with a superior temperature coefficient of ±100ppm/°C versus ±350ppm/°C. This represents an upgrade in temperature stability characteristics.

Parameter Comparison

Engineering Selection Recommendations

ROX1SJ330K Selection: The ROX1SJ330K is the direct series equivalent from TE Connectivity Passive Product with active product status. This substitute maintains identical physical dimensions, composition, and temperature characteristics. Selection of this part is appropriate for applications where ±5% tolerance specification is acceptable. The part carries ROHS3 compliance certification, supporting modern manufacturing and environmental standards.

FMF1WSFRF52-330K Selection: The FMF1WSFRF52-330K from YAGEO provides an alternative with metal film composition and superior temperature coefficient performance (±100ppm/°C). This substitute maintains ±1% tolerance matching the original specification and extends the operating temperature range to 155°C. Physical dimensions are slightly reduced (3.30mm x 9.00mm versus 3.50mm x 10.00mm), which may affect board layout compatibility. This part carries ROHS3 compliance and REACH Unaffected status. Selection is appropriate for applications requiring enhanced temperature stability and extended operating range.

Both substitute parts maintain the 330 kOhms resistance value, 1W power rating, axial package configuration, and safety/flame-proof characteristics required for functional equivalence.

Frequently Asked Questions (FAQ)

Q: Can ROX1SJ330K replace ROX1SF330K in all applications?

A: The ROX1SJ330K is functionally equivalent for applications where ±5% tolerance meets circuit requirements. Both parts share identical physical dimensions, composition, temperature coefficient, and operating temperature range. The tolerance relaxation from ±1% to ±5% is the primary difference and must be evaluated against circuit design specifications.

Q: What are the physical dimension differences between substitutes?

A: The ROX1SF330K and ROX1SJ330K share identical dimensions of 0.138" diameter by 0.394" length (3.50mm x 10.00mm). The FMF1WSFRF52-330K is slightly smaller at 0.130" diameter by 0.354" length (3.30mm x 9.00mm). This dimensional difference may affect board layout and mechanical clearance considerations.

Q: How does metal film composition differ from metal oxide film?

A: The FMF1WSFRF52-330K uses metal film composition while the ROX1SF330K and ROX1SJ330K use metal oxide film. Metal film resistors typically exhibit superior temperature coefficient performance (±100ppm/°C versus ±350ppm/°C) and tighter tolerance capabilities. Both compositions are suitable for general-purpose applications and meet safety/flame-proof requirements.

Q: Are the substitute parts RoHS compliant?

A: Both ROX1SJ330K and FMF1WSFRF52-330K carry ROHS3 compliance certification. The original ROX1SF330K does not specify RoHS status. For applications requiring RoHS compliance, either substitute part is appropriate.

Q: What is the temperature coefficient significance?

A: Temperature coefficient indicates resistance value change per degree Celsius. The ROX1SF330K and ROX1SJ330K specify ±350ppm/°C, while the FMF1WSFRF52-330K specifies ±100ppm/°C. Lower temperature coefficient values indicate greater resistance stability across temperature variations. Selection depends on circuit sensitivity to resistance value changes over the operating temperature range.

Q: Can FMF1WSFRF52-330K operate at temperatures above 130°C?

A: Yes. The FMF1WSFRF52-330K extends the maximum operating temperature to 155°C, compared to 130°C for the ROX1SF330K and ROX1SJ330K. This extended range is available for applications requiring operation at elevated temperatures within the specified limits.

Q: What packaging formats are available?

A: The ROX1SF330K is supplied in standard packaging format. The ROX1SJ330K is available in Cut Tape (CT) packaging. The FMF1WSFRF52-330K is available in Tape & Reel (TR) packaging. Packaging selection depends on production volume and assembly process requirements.