ROX1SF33K Equivalent & Substitute Parts

Part Overview

The ROX1SF33K is a 33 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 currently obsolete, necessitating identification of equivalent substitute components that maintain the same electrical and mechanical specifications for continued circuit functionality.

Substiute Parts

ROX1SF33K

TE Connectivity Passive ProductIn Stock: 1062ROX1SF33K Datasheet

Current PartRFQ

ROX1SJ33K

TE Connectivity Passive ProductIn Stock: 5980ROX1SJ33K Datasheet

SimilarRFQ

FMF1WSFRF52-33K

YAGEOIn Stock: 956FMF1WSFRF52-33K Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ROX1SF33K is determined by the following critical parameters: resistance value (33 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 substitution category.

Two substitute parts are identified:

ROX1SJ33K (TE Connectivity): Maintains identical resistance, power rating, package type, and operating temperature range. Tolerance differs at ±5%, representing a relaxed specification within the same product family and manufacturer.

FMF1WSFRF52-33K (YAGEO): Maintains identical resistance, power rating, and package type. Composition differs as metal film rather than metal oxide film. Operating temperature range extends to 155°C (higher than original). Temperature coefficient is ±100ppm/°C (superior to original ±350ppm/°C specification).

Parameter Comparison

Engineering Selection Recommendations

ROX1SJ33K is the primary substitute for direct replacement applications. This part maintains identical electrical characteristics with the original ROX1SF33K, including metal oxide film composition, operating temperature range, and temperature coefficient. The tolerance relaxation from ±1% to ±5% represents the only specification difference. As an active product from the same manufacturer and series, ROX1SJ33K provides continuity with established supply chains and proven compatibility. ROHS3 compliance and REACH unaffected status satisfy modern regulatory requirements.

FMF1WSFRF52-33K serves as an alternative substitute where enhanced temperature stability is beneficial. The metal film composition and ±100ppm/°C temperature coefficient provide superior performance compared to the original metal oxide film specification. The extended operating temperature range to 155°C accommodates higher-temperature applications. This YAGEO component is ROHS3 compliant and REACH unaffected. The absence of pulse-withstanding specification should be evaluated against circuit requirements.

Both substitutes are active products with current inventory availability, eliminating obsolescence concerns associated with the original ROX1SF33K.

Frequently Asked Questions (FAQ)

Q: Can ROX1SJ33K replace ROX1SF33K in all applications?

A: ROX1SJ33K is compatible for applications where the ±5% tolerance specification is acceptable. The relaxed tolerance from ±1% to ±5% represents the only electrical difference. Both parts share identical resistance value, power rating, composition, operating temperature range, and temperature coefficient. Physical dimensions and axial package configuration are identical.

Q: What is the primary difference between ROX1SJ33K and FMF1WSFRF52-33K?

A: The primary differences are composition type and temperature coefficient. ROX1SJ33K uses metal oxide film with ±350ppm/°C temperature coefficient, while FMF1WSFRF52-33K uses metal film with ±100ppm/°C temperature coefficient. FMF1WSFRF52-33K also extends the operating temperature range to 155°C versus 130°C for ROX1SJ33K. Both maintain ±1% tolerance and 1W power rating.

Q: Are physical dimensions identical across all three parts?

A: ROX1SF33K and ROX1SJ33K share identical dimensions of 0.138" diameter by 0.394" length (3.50mm x 10.00mm). FMF1WSFRF52-33K has slightly smaller dimensions of 0.130" diameter by 0.354" length (3.30mm x 9.00mm). Both configurations are axial through-hole packages suitable for standard PCB mounting.

Q: Which substitute is recommended for high-temperature applications?

A: FMF1WSFRF52-33K is suitable for applications requiring operation up to 155°C. The metal film composition and superior temperature coefficient of ±100ppm/°C provide enhanced stability across the extended temperature range compared to the original metal oxide film specification.

Q: Do both substitutes meet current regulatory compliance standards?

A: Both ROX1SJ33K and FMF1WSFRF52-33K are ROHS3 compliant and REACH unaffected, satisfying current regulatory requirements for electronic components in most jurisdictions.

Q: What is the significance of pulse-withstanding capability?

A: Pulse-withstanding capability indicates the resistor can tolerate transient overvoltage conditions without failure. ROX1SF33K and ROX1SJ33K both feature this specification. FMF1WSFRF52-33K does not list pulse-withstanding as a specified feature. Applications requiring pulse immunity should prioritize ROX1SJ33K as the substitute.