ROX1SF33R Equivalent & Substitute Parts

Part Overview

The ROX1SF33R is a 33 Ohm, 1% tolerance, 1W through-hole axial resistor manufactured by TE Connectivity Passive Product. This component is classified as obsolete, necessitating identification of equivalent substitute parts for ongoing design support and procurement requirements. The part features metal oxide film composition with flame-proof and pulse-withstanding characteristics suitable for demanding applications requiring safety-rated components.

Substiute Parts

ROX1SF33R

TE Connectivity Passive ProductIn Stock: 1128ROX1SF33R Datasheet

Current PartRFQ

FMF1WSFRF52-33R

YAGEOIn Stock: 874FMF1WSFRF52-33R Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ROX1SF33R is determined by strict equivalence across the following critical parameters:

Electrical Specifications:

• Resistance value: 33 Ohms (exact match required)
• Tolerance: ±1% (exact match required)
• Power rating: 1W (exact match required)

Physical & Mechanical Specifications:

• Package configuration: Axial through-hole (exact match required)
• Number of terminations: 2 (exact match required)

Environmental & Safety Specifications:

• Operating temperature range: minimum -55°C to 130°C coverage
• Flame-proof characteristic (required)
• Safety rating (required)

The FMF1WSFRF52-33R from YAGEO meets all critical substitution criteria. While this substitute employs metal film composition rather than metal oxide film, and exhibits different temperature coefficient and extended upper operating temperature, these differences remain within acceptable substitution parameters for the specified electrical and mechanical requirements.

Parameter Comparison

Engineering Selection Recommendations

The FMF1WSFRF52-33R serves as a direct electrical and mechanical substitute for the obsolete ROX1SF33R. Selection of this substitute is supported by the following factors:

Product Status: The FMF1WSFRF52-33R maintains active product status with confirmed inventory availability (815 Pcs), ensuring long-term procurement viability compared to the obsolete ROX1SF33R.

Compliance & Certifications: The FMF1WSFRF52-33R carries ROHS3 compliance and REACH unaffected status, meeting current regulatory requirements for electronic component procurement.

Electrical Equivalence: Both components provide identical resistance (33 Ohms), tolerance (±1%), and power rating (1W), ensuring functional interchangeability in circuit applications.

Physical Compatibility: Both components utilize axial through-hole packaging with two terminations. Minor dimensional differences (FMF1WSFRF52-33R is slightly smaller) do not preclude direct board-level substitution in standard axial component footprints.

Thermal Performance: The FMF1WSFRF52-33R provides extended upper operating temperature (155°C vs. 130°C) and superior temperature stability (±100ppm/°C vs. ±350ppm/°C), offering enhanced performance margins in temperature-sensitive applications.

Frequently Asked Questions (FAQ)

Q: Can the FMF1WSFRF52-33R directly replace the ROX1SF33R in existing designs?

A: Yes. Both components share identical electrical specifications (33 Ohms, ±1%, 1W) and axial through-hole packaging. The FMF1WSFRF52-33R is electrically and mechanically compatible for direct substitution.

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

A: Metal oxide film (ROX1SF33R) and metal film (FMF1WSFRF52-33R) are distinct resistor technologies. The FMF1WSFRF52-33R exhibits lower temperature coefficient (±100ppm/°C vs. ±350ppm/°C) and extended operating temperature range, providing superior stability in temperature-variable environments.

Q: Are there physical dimension differences between these components?

A: Yes. The FMF1WSFRF52-33R measures 0.130" Dia x 0.354" L (3.30mm x 9.00mm), while the ROX1SF33R measures 0.138" Dia x 0.394" L (3.50mm x 10.00mm). The substitute is slightly smaller but remains compatible with standard axial component footprints.

Q: Does the FMF1WSFRF52-33R meet current regulatory requirements?

A: Yes. The FMF1WSFRF52-33R is ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards for electronic component procurement.

Q: What packaging format is available for the FMF1WSFRF52-33R?

A: The FMF1WSFRF52-33R is supplied in Tape & Reel (TR) packaging format, suitable for automated assembly processes.

Q: Is the pulse-withstanding feature present in the substitute part?

A: The FMF1WSFRF52-33R is specified with flame-proof and safety features. Pulse-withstanding capability is not explicitly listed in the provided specifications for the substitute component.