ROX1SF150R Equivalent & Substitute Parts

Part Overview

The ROX1SF150R is a 150 Ohm, 1% tolerance, 1W through-hole axial resistor manufactured by TE Connectivity Passive Product. This component features metal oxide film construction with flame-proof and pulse-withstanding characteristics, designed for safety-critical applications. The part is classified as obsolete, necessitating identification of functionally equivalent alternatives for ongoing design support and procurement continuity.

Substiute Parts

ROX1SF150R

TE Connectivity Passive ProductIn Stock: 1202ROX1SF150R Datasheet

Current PartRFQ

FMF1WSFRF52-150R

YAGEOIn Stock: 684FMF1WSFRF52-150R Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ROX1SF150R is determined by strict equivalence across the following critical parameters:

• Resistance Value: 150 Ohms (exact match required)
• Tolerance: ±1% (precision specification)
• Power Rating: 1W (thermal and electrical capacity)
• Package Configuration: Axial through-hole (mechanical and assembly compatibility)
• Safety Features: Flame-proof and safety certifications (regulatory compliance)
• Operating Temperature Range: Minimum -55°C ~ 130°C coverage
• Termination Count: 2 (standard axial configuration)

The FMF1WSFRF52-150R from YAGEO meets all critical substitution criteria. While the substitute employs metal film composition instead of metal oxide film, both compositions satisfy the specified electrical parameters and safety requirements for this application category.

Parameter Comparison

Engineering Selection Recommendations

The FMF1WSFRF52-150R is a direct functional substitute for the obsolete ROX1SF150R. Selection of this alternative is supported by the following factors:

Product Status: The FMF1WSFRF52-150R maintains active production status, ensuring long-term availability and supply chain continuity compared to the obsolete ROX1SF150R.

Electrical Equivalence: Both components deliver identical resistance (150 Ohms) and tolerance (±1%) specifications. The 1W power rating is matched across both parts, confirming thermal and electrical capacity equivalence.

Safety Compliance: Both resistors incorporate flame-proof and safety features required for safety-critical applications. The FMF1WSFRF52-150R carries ROHS3 compliance certification, meeting current regulatory requirements.

Thermal Performance: The FMF1WSFRF52-150R operates across an extended temperature range (-55°C ~ 155°C) that encompasses the original specification (-55°C ~ 130°C). The substitute exhibits superior temperature coefficient stability (±100ppm/°C versus ±350ppm/°C), providing enhanced precision across temperature variations.

Mechanical Compatibility: Both components utilize axial through-hole packaging with identical termination configuration (2 leads). Physical dimensions are comparable, with the substitute featuring slightly reduced envelope dimensions that maintain PCB layout compatibility.

Frequently Asked Questions (FAQ)

Q: Can the FMF1WSFRF52-150R be used as a direct replacement for ROX1SF150R in existing designs?

A: Yes. The FMF1WSFRF52-150R meets all critical electrical and mechanical specifications required for direct substitution. Resistance value, tolerance, power rating, and axial package configuration are identical. Both components satisfy flame-proof and safety feature requirements.

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

A: Both compositions are film-type resistor technologies that meet the specified electrical parameters for this application. Metal film resistors, as used in the FMF1WSFRF52-150R, typically exhibit superior temperature coefficient stability and lower noise characteristics. Metal oxide film resistors, as used in the original ROX1SF150R, provide pulse-withstanding capability. The FMF1WSFRF52-150R maintains flame-proof and safety certifications required for the application.

Q: Are there physical size differences between these components?

A: The FMF1WSFRF52-150R has slightly reduced dimensions (0.130" Dia x 0.354" L) compared to the ROX1SF150R (0.138" Dia x 0.394" L). These dimensional differences are minor and do not affect PCB layout compatibility for standard through-hole axial resistor footprints.

Q: What is the temperature coefficient difference, and does it affect circuit performance?

A: The FMF1WSFRF52-150R exhibits a temperature coefficient of ±100ppm/°C, compared to ±350ppm/°C for the ROX1SF150R. This indicates superior resistance stability across temperature variations. For most applications, this represents an improvement in performance characteristics.

Q: Is the FMF1WSFRF52-150R available in the same packaging format?

A: The FMF1WSFRF52-150R is supplied in Tape & Reel (TR) packaging, while the original ROX1SF150R packaging format is not specified in the provided data. Both components utilize identical axial through-hole package configuration suitable for standard PCB assembly processes.

Q: Does the substitute part carry current regulatory compliance certifications?

A: Yes. The FMF1WSFRF52-150R is ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements. The original ROX1SF150R compliance status is not specified in the provided data.