ROX1SF100K Equivalent & Substitute Parts

Part Overview

The ROX1SF100K is a 100 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 classified as obsolete, necessitating identification of equivalent substitute components for ongoing design requirements and procurement needs.

Key Parameters

Parameter	Value
Resistance	100 kOhms
Tolerance	±1%
Power Rating	1W
Composition	Metal Oxide Film
Package Type	Axial
Temperature Coefficient	±350ppm/°C
Operating Temperature Range	-55°C ~ 130°C
Features	Flame Proof, Pulse Withstanding, Safety

Substitute Part Grouping Explanation

Substitution eligibility for the ROX1SF100K is determined by the following critical parameters:

Primary Matching Criteria:

Resistance value: 100 kOhms (exact match required)
Package type: Axial (form factor compatibility)
Composition: Metal Oxide Film or Metal Film (functionally equivalent film technologies)
Features: Flame Proof and Safety ratings (mandatory for equivalent performance)

Secondary Compatibility Parameters:

Tolerance: ±1% or tighter (±2% represents acceptable relaxation for non-critical applications)
Power rating: Equal to or greater than 1W (derating capability)
Operating temperature range: Must encompass or exceed -55°C ~ 130°C minimum
Temperature coefficient: ±350ppm/°C or lower (tighter coefficient acceptable)

Two substitute parts meet these criteria with documented electrical and mechanical compatibility.

Parameter Comparison

Parameter	ROX1SF100K (Main)	ROX2SG100K (Substitute)	FMF1WSFRF52-100K (Substitute)
Manufacturer	TE Connectivity Passive Product	TE Connectivity Passive Product	YAGEO
Resistance	100 kOhms	100 kOhms	100 kOhms
Tolerance	±1%	±2%	±1%
Power Rating	1W	2W	1W
Composition	Metal Oxide Film	Metal Oxide Film	Metal Film
Package Type	Axial	Axial	Axial
Temperature Coefficient	±350ppm/°C	±350ppm/°C	±100ppm/°C
Operating Temperature Range	-55°C ~ 130°C	-55°C ~ 200°C	-55°C ~ 155°C
Features	Flame Proof, Pulse Withstanding, Safety	Flame Proof, Pulse Withstanding, Safety	Flame Proof, Safety
Product Status	Obsolete	Active	Active
Size / Dimension	0.138" Dia x 0.394" L (3.50mm x 10.00mm)	0.197" Dia x 0.472" L (5.00mm x 12.00mm)	0.130" Dia x 0.354" L (3.30mm x 9.00mm)

Engineering Selection Recommendations

ROX2SG100K (TE Connectivity Passive Product)

The ROX2SG100K is an active product from the same manufacturer series (ROX/Neohm) with identical resistance and composition. This substitute provides enhanced power handling at 2W versus the original 1W specification, extended operating temperature range to 200°C, and maintains all safety and flame-proof certifications. The tolerance relaxation to ±2% represents the primary trade-off. This part is suitable for applications where the original 1W rating provides adequate margin or where increased thermal headroom is beneficial. RoHS3 compliance is documented.

FMF1WSFRF52-100K (YAGEO)

The FMF1WSFRF52-100K is an active product offering identical resistance, tolerance, and power rating to the original ROX1SF100K. This YAGEO metal film resistor provides superior temperature coefficient performance at ±100ppm/°C compared to the original ±350ppm/°C specification. The operating temperature range extends to 155°C, exceeding the original 130°C maximum. Metal film composition provides enhanced stability characteristics. This part lacks the pulse-withstanding feature present in the original specification. RoHS3 compliance and REACH unaffected status are documented.

Frequently Asked Questions (FAQ)

Q: Can ROX2SG100K directly replace ROX1SF100K in all applications?

A: The ROX2SG100K provides functional equivalence for resistance value, package type, and safety features. The tolerance change from ±1% to ±2% and increased physical dimensions require circuit-level verification. The enhanced power rating and extended temperature range provide additional design margin. Pulse-withstanding capability is maintained.

Q: What is the primary difference between ROX2SG100K and FMF1WSFRF52-100K?

A: ROX2SG100K is a metal oxide film resistor with 2W power rating and ±350ppm/°C temperature coefficient. FMF1WSFRF52-100K is a metal film resistor with 1W power rating and ±100ppm/°C temperature coefficient. The metal film composition of the YAGEO part provides superior frequency response and stability. The ROX2SG100K offers higher power dissipation capability.

Q: Are physical dimensions critical for substitution?

A: Axial package compatibility is maintained across all three parts. However, dimensional differences exist: ROX1SF100K measures 3.50mm diameter × 10.00mm length, ROX2SG100K measures 5.00mm diameter × 12.00mm length, and FMF1WSFRF52-100K measures 3.30mm diameter × 9.00mm length. PCB layout and mechanical clearance must be verified for the larger ROX2SG100K variant.

Q: Does FMF1WSFRF52-100K lack pulse-withstanding capability?

A: The FMF1WSFRF52-100K specification does not document pulse-withstanding as a feature, unlike the original ROX1SF100K and ROX2SG100K substitute. Applications requiring pulse-withstanding performance should select ROX2SG100K.

Q: What compliance certifications apply to these substitutes?

A: ROX2SG100K holds RoHS3 compliance with vendor-undefined REACH status. FMF1WSFRF52-100K holds RoHS3 compliance with REACH unaffected status. Both parts carry EAR99 ECCN classification and 8533.21.0090 HTSUS code matching the original part.

Q: Which substitute offers the best temperature stability?

A: FMF1WSFRF52-100K provides the lowest temperature coefficient at ±100ppm/°C, compared to ±350ppm/°C for both the original ROX1SF100K and ROX2SG100K substitute. This superior stability derives from metal film composition technology.

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