RWR81S4750FPBSL Equivalent & Substitute Parts

Part Overview

The RWR81S4750FPBSL is a 475 Ohm, 1W wirewound axial resistor manufactured by Vishay Dale, designed for military applications per MIL-PRF-39007 specification. 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 887 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

RWR81S4750FPBSL

Vishay DaleIn Stock: 934RWR81S4750FPBSL Datasheet

Current PartRFQ

RWR81S4750FRB12

Vishay DaleIn Stock: 1178RWR81S4750FRB12 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RWR81S4750FPBSL is determined by strict equivalence across the following critical parameters:

• Resistance value: 475 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 (2.16mm x 6.35mm)
• Military specification compliance: MIL-PRF-39007, RWR81S series
• Moisture resistance: Required

The RWR81S4750FRB12 meets all substitution criteria as a direct equivalent from the same manufacturer and military series, with identical electrical and mechanical specifications. The primary distinction is the failure rate classification, which differs between the two parts but does not affect functional interchangeability.

Parameter Comparison

Engineering Selection Recommendations

Both the RWR81S4750FPBSL and RWR81S4750FRB12 are Active products from Vishay Dale with identical electrical and mechanical specifications. Selection between these parts should be based on:

• Inventory availability and lead time requirements
• Failure rate specifications for the application (0.1% versus 0.01%)
• Compliance requirements: Both parts maintain identical RoHS non-compliant and REACH Affected status with EAR99 export classification
• Military specification adherence: Both fully comply with MIL-PRF-39007

Frequently Asked Questions (FAQ)

Q: Can RWR81S4750FRB12 be used as a direct replacement for RWR81S4750FPBSL?

A: Yes. Both parts are electrically and mechanically identical 475 Ohm, 1W wirewound axial resistors with ±1% tolerance, ±20ppm/°C temperature coefficient, and -55°C to 250°C operating range. They share identical physical dimensions, military series classification, and moisture-resistant construction.

Q: What is the difference between these two parts?

A: The primary difference is the failure rate classification: RWR81S4750FPBSL carries a P-level failure rate (0.1%), while RWR81S4750FRB12 carries an R-level failure rate (0.01%). Both maintain Active product status and identical compliance certifications.

Q: Are there any package or footprint differences?

A: No. Both parts use identical Axial packaging with dimensions of 0.085" Dia x 0.250" L (2.16mm x 6.35mm). PCB layout and mounting requirements are identical.

Q: Do these parts have different compliance or certification status?

A: No. Both parts share identical RoHS non-compliant status, REACH Affected designation, EAR99 export classification, and HTSUS code 8533.21.0080.

Q: Which part should be selected for high-reliability applications?

A: Selection should be based on specific failure rate requirements. The RWR81S4750FRB12 with R-level failure rate (0.01%) provides lower failure rate specification compared to the P-level (0.1%) of the RWR81S4750FPBSL.