RN55C4371CBSL Equivalent & Substitute Parts

Part Overview

The RN55C4371CBSL is a 4.37 kOhms ±0.25% metal film through-hole resistor rated at 0.125W (1/8W) in axial package configuration. This component is manufactured by Vishay Dale and complies with military specification MIL-R-10509/7. The part features flame retardant coating, moisture resistance, and safety-rated construction suitable for military and high-reliability applications. Product status is Active with 955 units in current inventory.

Substitute parts are identified when electrical and mechanical parameters remain within acceptable tolerances for the application, allowing for direct replacement without circuit redesign.

Substiute Parts

RN55C4371CBSL

Vishay DaleIn Stock: 1033RN55C4371CBSL Datasheet

Current PartRFQ

RN55C4371BB14

Vishay DaleIn Stock: 1016RN55C4371BB14 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RN55C4371CBSL is determined by the following critical parameters:

• Resistance Value: Must be 4.37 kOhms
• Power Rating: Must be 0.125W (1/8W) minimum
• Package Type: Must be Axial configuration
• Physical Dimensions: Must be 0.090" Dia x 0.240" L (2.29mm x 6.10mm)
• Composition: Must be Metal Film
• Temperature Coefficient: Must be ±50ppm/°C
• Operating Temperature Range: Must support -65°C to 175°C
• Series Compliance: Must conform to MIL-R-10509/7 military specification

The RN55C4371BB14 qualifies as a direct substitute. While tolerance is improved to ±0.1% (tighter than the original ±0.25%), all other electrical and mechanical parameters remain identical. Tighter tolerance represents an upgrade path with no negative impact on circuit performance.

Parameter Comparison

Engineering Selection Recommendations

Both the RN55C4371CBSL and RN55C4371BB14 maintain Active product status with current manufacturer support. Selection between these parts is based on tolerance requirements:

• RN55C4371CBSL: Select when ±0.25% tolerance meets circuit specifications and cost optimization is prioritized.
• RN55C4371BB14: Select when ±0.1% tolerance is required for precision applications or when tighter tolerance provides design margin.

Both parts comply with identical military specifications (MIL-R-10509/7), regulatory certifications (REACH Affected, EAR99 ECCN), and environmental ratings. Physical footprint and thermal characteristics are identical, ensuring direct PCB compatibility without layout modifications.

Frequently Asked Questions (FAQ)

Q: Can RN55C4371BB14 replace RN55C4371CBSL in existing designs?

A: Yes. The RN55C4371BB14 is a direct substitute with identical electrical and mechanical parameters except for improved tolerance (±0.1% vs ±0.25%). No circuit redesign or PCB layout changes are required.

Q: What is the primary difference between these two parts?

A: Tolerance specification. The RN55C4371BB14 provides ±0.1% tolerance compared to ±0.25% for the RN55C4371CBSL. All other parameters—resistance value, power rating, package type, dimensions, temperature range, and military compliance—are identical.

Q: Are these parts physically interchangeable?

A: Yes. Both parts share identical axial package dimensions (0.090" Dia x 0.240" L / 2.29mm x 6.10mm) and can be mounted in the same PCB footprint without modification.

Q: Do both parts meet military specifications?

A: Yes. Both RN55C4371CBSL and RN55C4371BB14 conform to MIL-R-10509/7 military specification and include flame retardant coating, moisture resistance, and safety-rated construction.

Q: What is the temperature operating range for both parts?

A: Both parts operate across -65°C to 175°C with a temperature coefficient of ±50ppm/°C.

Q: Are there any compliance differences between these parts?

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