ROX1SF3K3 Equivalent & Substitute Parts

Part Overview

The ROX1SF3K3 is a 3.3 kOhms ±1% 1W through-hole resistor manufactured by TE Connectivity Passive Product. This axial metal oxide film resistor features flame-proof and pulse-withstanding characteristics, designed for applications requiring safety-rated components. The part is classified as obsolete, necessitating identification of active equivalent components for ongoing procurement and design requirements.

Substiute Parts

ROX1SF3K3

TE Connectivity Passive ProductIn Stock: 733ROX1SF3K3 Datasheet

Current PartRFQ

FMF1WSFRF52-3K3

YAGEOIn Stock: 1125FMF1WSFRF52-3K3 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ROX1SF3K3 is determined by the following critical parameters:

Electrical Specifications:

• Resistance value: 3.3 kOhms
• Tolerance: ±1%
• Power rating: 1W

Physical Specifications:

• Package configuration: Axial through-hole
• Number of terminations: 2

Safety & Compliance:

• Flame-proof rating
• Safety certification features

The FMF1WSFRF52-3K3 from YAGEO meets all mandatory electrical and physical requirements for direct substitution. While the FMF series uses metal film composition compared to the metal oxide film of the ROX1 series, both compositions satisfy the specified electrical parameters and safety requirements for this resistance value and power rating.

Parameter Comparison

Engineering Selection Recommendations

The FMF1WSFRF52-3K3 is the direct substitute for the obsolete ROX1SF3K3. Selection is based on the following factors:

Product Status: The FMF1WSFRF52-3K3 maintains active product status, ensuring continued availability and supply chain reliability compared to the obsolete ROX1SF3K3.

Electrical Compatibility: Both components share identical resistance value (3.3 kOhms), tolerance (±1%), and power rating (1W), meeting all core electrical requirements.

Physical Compatibility: Both components utilize axial through-hole packaging with two terminations, enabling direct mechanical substitution in existing PCB layouts.

Compliance & Certifications: The FMF1WSFRF52-3K3 is RoHS3 compliant and REACH unaffected, meeting current regulatory requirements. Both components carry identical ECCN (EAR99) and HTSUS (8533.21.0090) classifications.

Temperature Performance: The FMF1WSFRF52-3K3 provides an extended operating temperature range (-55°C ~ 155°C) compared to the ROX1SF3K3 (-55°C ~ 130°C), offering improved thermal margin in high-temperature applications.

Composition Difference: The FMF series metal film composition exhibits superior temperature stability (±100ppm/°C) relative to the metal oxide film composition of the ROX1 series (±350ppm/°C), providing enhanced frequency stability in precision applications.

Frequently Asked Questions (FAQ)

Q: Can the FMF1WSFRF52-3K3 be used as a direct replacement for the ROX1SF3K3 in existing designs?

A: Yes. Both components share identical electrical specifications (3.3 kOhms, ±1%, 1W) and axial through-hole packaging, enabling direct substitution without circuit modification.

Q: What is the primary difference between the ROX1SF3K3 and FMF1WSFRF52-3K3?

A: The ROX1SF3K3 uses metal oxide film composition, while the FMF1WSFRF52-3K3 uses metal film composition. The FMF series provides superior temperature coefficient stability (±100ppm/°C versus ±350ppm/°C) and an extended operating temperature range (155°C maximum versus 130°C maximum).

Q: Are there packaging differences between these components?

A: Both components use axial through-hole packaging. Physical dimensions differ slightly: the ROX1SF3K3 measures 0.138" Dia x 0.394" L (3.50mm x 10.00mm), while the FMF1WSFRF52-3K3 measures 0.130" Dia x 0.354" L (3.30mm x 9.00mm). These dimensional variations do not affect PCB layout compatibility for standard through-hole applications.

Q: Does the FMF1WSFRF52-3K3 meet safety requirements equivalent to the ROX1SF3K3?

A: Yes. Both components feature flame-proof and safety certifications. The FMF1WSFRF52-3K3 does not list pulse-withstanding capability in its specification, which should be evaluated if this feature is critical to the application.

Q: What is the availability status of each component?

A: The ROX1SF3K3 is classified as obsolete with 700 pieces in stock. The FMF1WSFRF52-3K3 is active with 1054 pieces available in tape and reel packaging, ensuring long-term procurement viability.

Q: Are both components RoHS compliant?

A: The FMF1WSFRF52-3K3 is RoHS3 compliant. RoHS compliance status for the ROX1SF3K3 is not specified in the provided data.