RWR81N1000FSBSL Equivalent & Substitute Parts

Part Overview

The RWR81N1000FSBSL is a 100 Ohm, 1W wirewound axial resistor manufactured by Vishay Dale, designed for military applications per MIL-PRF-39007 specifications. This component features moisture-resistant construction and non-inductive characteristics, making it suitable for high-reliability electronic systems operating across extended temperature ranges. The part maintains Active product status with 627 units currently in stock. Substitute parts are identified when electrical parameters, mechanical form factors, and compliance certifications remain equivalent across the component lifecycle and manufacturing variations.

Key Parameters

Parameter	Value
Resistance	100 Ohms
Tolerance	±1%
Power Rating	1W
Composition	Wirewound
Package Type	Axial
Temperature Coefficient	±20ppm/°C
Operating Temperature Range	-55°C to 250°C
Size/Dimension	0.085" Dia x 0.250" L (2.16mm x 6.35mm)
Series	Military, MIL-PRF-39007, RWR81
Failure Rate	S (0.001%)

Substitute Part Grouping Explanation

Substitution eligibility for the RWR81N1000FSBSL is determined by strict equivalence across the following parameters:

Resistance value: 100 Ohms
Tolerance: ±1%
Power rating: 1W
Composition: Wirewound
Package/Case: Axial
Temperature coefficient: ±20ppm/°C
Operating temperature range: -55°C to 250°C
Physical dimensions: 0.085" Dia x 0.250" L
Military series compliance: MIL-PRF-39007, RWR81 base product family
Failure rate classification: S (0.001%)

The RWR81S1000FSB12 qualifies as a parametric equivalent substitute. Both parts share identical electrical specifications, mechanical form factors, and military-grade reliability ratings. The substitution reflects manufacturing series variation within the RWR81 base product family while maintaining all critical performance and compliance attributes.

Parameter Comparison

Parameter	RWR81N1000FSBSL	RWR81S1000FSB12	Match Status
Resistance	100 Ohms	100 Ohms	Equivalent
Tolerance	±1%	±1%	Equivalent
Power Rating	1W	1W	Equivalent
Composition	Wirewound	Wirewound	Equivalent
Package Type	Axial	Axial	Equivalent
Temperature Coefficient	±20ppm/°C	±20ppm/°C	Equivalent
Operating Temperature Range	-55°C to 250°C	-55°C to 250°C	Equivalent
Size/Dimension	0.085" Dia x 0.250" L (2.16mm x 6.35mm)	0.085" Dia x 0.250" L (2.16mm x 6.35mm)	Equivalent
Series	Military, MIL-PRF-39007, RWR81	Military, MIL-PRF-39007, RWR81S	Compatible Family
Failure Rate	S (0.001%)	S (0.001%)	Equivalent
Product Status	Active	Active	Equivalent
RoHS Status	RoHS non-compliant	RoHS non-compliant	Equivalent
REACH Status	REACH Affected	REACH Affected	Equivalent
ECCN	EAR99	EAR99	Equivalent
HTSUS Code	8533.21.0080	8533.21.0080	Equivalent

Engineering Selection Recommendations

Both the RWR81N1000FSBSL and RWR81S1000FSB12 maintain Active product status and are suitable for direct substitution in military-grade applications. Selection between these parts should be based on inventory availability and supply chain requirements rather than technical performance differences.

The RWR81S1000FSB12 currently maintains higher inventory levels (797 units) compared to the RWR81N1000FSBSL (627 units), which may influence procurement decisions for high-volume applications. Both parts comply with identical regulatory frameworks (RoHS non-compliant, REACH Affected, EAR99 classification) and carry equivalent failure rate ratings for reliability-critical systems.

Frequently Asked Questions (FAQ)

Q: Can RWR81S1000FSB12 be used as a direct replacement for RWR81N1000FSBSL?

A: Yes. Both parts are electrically and mechanically equivalent with identical resistance values (100 Ohms ±1%), power ratings (1W), temperature coefficients (±20ppm/°C), operating ranges (-55°C to 250°C), and axial package dimensions (0.085" Dia x 0.250" L). They share the same MIL-PRF-39007 military specification compliance and failure rate classification.

Q: What is the difference between the RWR81N and RWR81S series designations?

A: The series designation reflects manufacturing line variation within the RWR81 base product family. The "N" and "S" suffixes indicate different production batches or manufacturing periods, but do not affect electrical performance, mechanical compatibility, or reliability characteristics. Both series maintain identical specifications for military wirewound resistors.

Q: Are there any compliance or certification differences between these parts?

A: No. Both parts carry identical compliance status: RoHS non-compliant, REACH Affected, EAR99 export classification, and HTSUS code 8533.21.0080. Failure rate ratings (S classification at 0.001%) are equivalent across both parts.

Q: What determines substitution eligibility for this resistor category?

A: Substitution is based on strict equivalence across resistance value, tolerance, power rating, composition (wirewound), package type (axial), temperature coefficient, operating temperature range, physical dimensions, military series compliance, and failure rate classification. All these parameters must match exactly for parts to be considered equivalent substitutes.

Q: Can these parts be used in applications requiring RoHS compliance?

A: No. Both RWR81N1000FSBSL and RWR81S1000FSB12 are marked as RoHS non-compliant. Applications with RoHS requirements must source alternative components meeting RoHS specifications.

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