RWR81S2000FMB12 Equivalent & Substitute Parts

Part Overview

The RWR81S2000FMB12 is a 200 Ohms ±1% 1W through-hole resistor with axial leads, manufactured by Vishay Dale under the military-grade RWR81S series compliant with MIL-PRF-39007. This wirewound resistor features moisture-resistant construction and is designed for military applications requiring high reliability and stability across extended temperature ranges. The part is currently active in production with 669 units in stock. Substitute parts are necessary to address inventory availability, specific failure rate requirements, or procurement lead time constraints while maintaining identical electrical and mechanical specifications.

Substiute Parts

RWR81S2000FMB12

Vishay DaleIn Stock: 708RWR81S2000FMB12 Datasheet

Current PartRFQ

RWR81S2000FRB12

Vishay DaleIn Stock: 869RWR81S2000FRB12 Datasheet

DirectRFQ

RWR81S2000FSB12

Vishay DaleIn Stock: 1009RWR81S2000FSB12 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RWR81S2000FMB12 is determined by strict equivalence across the following parameters: resistance value (200 Ohms), tolerance (±1%), power rating (1W), composition (wirewound), package type (axial), temperature coefficient (±20ppm/°C), operating temperature range (-55°C to 250°C), physical dimensions (0.085" Dia x 0.250" L), and series compliance (MIL-PRF-39007, RWR81S). All qualified substitutes maintain identical electrical performance and mechanical compatibility. Failure rate classifications differ among equivalent parts, reflecting manufacturing process variations and quality screening levels, but do not affect functional interchangeability in circuit applications.

Parameter Comparison

Engineering Selection Recommendations

All three parts—RWR81S2000FMB12, RWR81S2000FRB12, and RWR81S2000FSB12—are functionally equivalent and directly interchangeable. Selection should be based on failure rate requirements and inventory availability. The RWR81S2000FSB12 offers the lowest failure rate (S: 0.001%) and highest stock level (989 units), making it suitable for applications requiring maximum reliability. The RWR81S2000FRB12 provides an intermediate failure rate (R: 0.01%) with 801 units available. The RWR81S2000FMB12 carries a standard failure rate (M: 1%) with 669 units in stock. All parts maintain active production status and comply with MIL-PRF-39007 military specifications. RoHS non-compliance and REACH-affected status are consistent across all equivalents.

Frequently Asked Questions (FAQ)

Q: Are RWR81S2000FRB12 and RWR81S2000FSB12 direct replacements for RWR81S2000FMB12?

A: Yes. All three parts are electrically and mechanically identical, differing only in failure rate classification. They share the same 200 Ohm resistance, ±1% tolerance, 1W power rating, wirewound composition, axial package, temperature coefficient, operating range, and physical dimensions.

Q: What does the failure rate designation mean?

A: Failure rate classifications (M, R, S) reflect manufacturing screening and quality levels. M (1%) represents standard screening, R (0.01%) represents enhanced screening, and S (0.001%) represents the highest screening level. All parts meet MIL-PRF-39007 requirements.

Q: Can I use a substitute part with a different failure rate in my circuit?

A: Yes. Failure rate differences do not affect electrical performance or mechanical compatibility. Selection depends on your application's reliability requirements and procurement constraints.

Q: Are the physical dimensions identical across all three parts?

A: Yes. All parts measure 0.085" diameter by 0.250" length (2.16mm x 6.35mm) and use axial leads, ensuring identical PCB footprint and mounting compatibility.

Q: What is the difference between these parts and other RWR81S resistors?

A: These three parts are specific to the 200 Ohm, 1W, ±1% configuration within the RWR81S military series. Other RWR81S parts may differ in resistance value, power rating, or tolerance.