RWR81S5R11FSBSL Equivalent & Substitute Parts

Part Overview

The RWR81S5R11FSBSL is a 5.11 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 operates across an extended temperature range of -55°C to 250°C. The part maintains Active product status with 874 units currently in stock. Substitute parts are identified to address inventory availability, lead time requirements, or specific failure rate specifications while maintaining full electrical and mechanical compatibility.

Substiute Parts

RWR81S5R11FSBSL

Vishay DaleIn Stock: 956RWR81S5R11FSBSL Datasheet

Current PartRFQ

RWR81S5R11FRB12

Vishay DaleIn Stock: 1228RWR81S5R11FRB12 Datasheet

DirectRFQ

RWR81S5R11FSB12

Vishay DaleIn Stock: 1248RWR81S5R11FSB12 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RWR81S5R11FSBSL is determined by strict equivalence across the following critical parameters: resistance value (5.11 Ohms), tolerance (±1%), power rating (1W), composition (wirewound), package configuration (axial), temperature coefficient (±50ppm/°C), operating temperature range (-55°C to 250°C), physical dimensions (0.085" Dia x 0.250" L), and military series classification (MIL-PRF-39007, RWR81S). All identified substitutes maintain identical electrical specifications and mechanical form factors. Variance in failure rate classification does not affect functional substitutability and reflects manufacturing process variations within the same product line.

Parameter Comparison

Engineering Selection Recommendations

All three parts—RWR81S5R11FSBSL, RWR81S5R11FRB12, and RWR81S5R11FSB12—maintain Active product status and are manufactured to identical electrical and mechanical specifications within the MIL-PRF-39007 military standard. Selection between these parts should be based on inventory availability and failure rate requirements. RWR81S5R11FSBSL and RWR81S5R11FSB12 both carry S-class failure rate (0.001%), while RWR81S5R11FRB12 carries R-class failure rate (0.01%). All parts are RoHS non-compliant and REACH-affected, with identical ECCN (EAR99) and HTSUS (8533.21.0080) classifications. Moisture sensitivity level is not applicable to this product category.

Frequently Asked Questions (FAQ)

Q: Can RWR81S5R11FRB12 be used as a direct replacement for RWR81S5R11FSBSL?

A: Yes. Both parts are electrically and mechanically identical, with resistance, tolerance, power rating, temperature range, and physical dimensions matching exactly. The difference in failure rate classification (R versus S) reflects manufacturing process variation and does not affect functional compatibility in circuit applications.

Q: Are there any package or form factor differences between these substitutes?

A: No. All three parts use identical axial package configuration with dimensions of 0.085" diameter by 0.250" length (2.16mm x 6.35mm). They are mechanically interchangeable in PCB layouts and through-hole applications.

Q: What determines substitutability for this resistor family?

A: Substitutability is determined by matching resistance value (5.11 Ohms), tolerance (±1%), power rating (1W), composition (wirewound), package type (axial), temperature coefficient (±50ppm/°C), operating temperature range (-55°C to 250°C), and military series classification (MIL-PRF-39007, RWR81S). All identified substitutes meet these criteria.

Q: Do compliance and certification differences affect substitution?

A: No. All three parts share identical RoHS status (non-compliant), REACH status (affected), ECCN classification (EAR99), and HTSUS code (8533.21.0080). Compliance profiles are equivalent across all substitutes.

Q: Which part should be selected based on inventory considerations?

A: RWR81S5R11FSB12 offers the highest current inventory (1206 units), followed by RWR81S5R11FRB12 (1202 units), with RWR81S5R11FSBSL at 874 units. Selection should align with procurement lead time and availability requirements.