ROX1SF3K0 Equivalent & Substitute Parts

Part Overview

The ROX1SF3K0 is a 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 safety-critical applications. The part is classified as obsolete, necessitating identification of active equivalent components that maintain electrical and mechanical compatibility for ongoing production and repair requirements.

Substiute Parts

ROX1SF3K0

TE Connectivity Passive ProductIn Stock: 1003ROX1SF3K0 Datasheet

Current PartRFQ

FMF1WSFRF52-3K

YAGEOIn Stock: 884FMF1WSFRF52-3K Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ROX1SF3K0 is determined by the following critical parameters:

Electrical Compatibility Requirements:

• Resistance value: 3 kOhms
• Tolerance: ±1%
• Power rating: 1W
• Package configuration: Axial through-hole

Mechanical Compatibility Requirements:

• Axial lead configuration for PCB mounting
• Physical dimensions compatible with standard axial component spacing

Functional Requirements:

• Flame-proof rating for safety applications
• Operating temperature range that encompasses or exceeds -55°C ~ 130°C

The substitute part FMF1WSFRF52-3K meets all electrical and mechanical compatibility criteria. While the substitute employs metal film composition instead of metal oxide film, it maintains the required resistance value, tolerance, power rating, and axial package configuration. The substitute part is classified as active, ensuring ongoing availability.

Parameter Comparison

Engineering Selection Recommendations

The FMF1WSFRF52-3K is the qualified substitute for the obsolete ROX1SF3K0 based on the following criteria:

Electrical Equivalence: Both parts provide identical resistance value (3 kOhms) and tolerance (±1%) at the same power rating (1W), ensuring direct functional replacement in circuit applications.

Mechanical Compatibility: Both components utilize axial through-hole packaging, permitting installation in existing PCB layouts without modification. Dimensional differences (3.30mm vs 3.50mm diameter; 9.00mm vs 10.00mm length) are within standard axial component tolerances and do not affect board-level compatibility.

Compliance Status: The substitute part carries active product status with ROHS3 compliance and REACH unaffected designation, supporting current manufacturing and regulatory requirements. The main part's compliance status is not specified.

Operational Characteristics: The substitute part extends the operating temperature range to -55°C ~ 155°C, providing enhanced thermal performance. The improved temperature coefficient (±100ppm/°C versus ±350ppm/°C) offers superior stability across temperature variations.

Safety Features: Both parts maintain flame-proof and safety ratings required for safety-critical applications. The substitute part does not specify pulse-withstanding capability; applications requiring this feature require circuit-level evaluation.

Frequently Asked Questions (FAQ)

Q: Can FMF1WSFRF52-3K directly replace ROX1SF3K0 in all applications?

A: Yes, for applications requiring 3 kOhms ±1% at 1W with axial through-hole mounting. Both parts meet these electrical and mechanical specifications. Applications specifically requiring pulse-withstanding capability should evaluate the substitute part's performance characteristics independently.

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

A: Metal oxide film and metal film are distinct resistor technologies. The main part uses metal oxide film composition; the substitute uses metal film composition. Both achieve the specified resistance value and tolerance. The substitute demonstrates improved temperature coefficient performance (±100ppm/°C vs ±350ppm/°C).

Q: Are there dimensional compatibility concerns?

A: The substitute part is slightly smaller (3.30mm diameter, 9.00mm length) compared to the main part (3.50mm diameter, 10.00mm length). These dimensional differences are within standard axial component tolerances and do not prevent PCB mounting or circuit operation.

Q: What is the inventory status for each part?

A: ROX1SF3K0 has 921 pieces in stock but is classified as obsolete. FMF1WSFRF52-3K has 784 pieces in stock and is classified as active, ensuring continued availability for future procurement.

Q: Are there regulatory compliance differences?

A: FMF1WSFRF52-3K carries ROHS3 compliance and REACH unaffected designation. The main part's compliance status is not specified. For applications subject to ROHS or REACH requirements, the substitute part meets these regulatory frameworks.

Q: What packaging formats are available?

A: ROX1SF3K0 is supplied in standard packaging format. FMF1WSFRF52-3K is supplied in Tape & Reel (TR) format, suitable for automated assembly processes.