RN55C49R9CBSL Equivalent & Substitute Parts

Part Overview

The RN55C49R9CBSL is a 49.9 Ohm, 1/8W metal film through-hole resistor manufactured by Vishay Dale, designed for military applications per MIL-R-10509/7 specification. This axial component features flame retardant coating, moisture resistance, and safety-rated construction suitable for high-reliability electronic assemblies. The part maintains active product status with 894 units in current inventory. Substitute parts are identified to address specific tolerance requirements or inventory availability while maintaining electrical and mechanical compatibility.

Substiute Parts

RN55C49R9CBSL

Vishay DaleIn Stock: 942RN55C49R9CBSL Datasheet

Current PartRFQ

RN55C49R9BB14

Vishay DaleIn Stock: 872RN55C49R9BB14 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RN55C49R9CBSL is determined by the following critical parameters:

• Resistance Value: Must be 49.9 Ohms (exact match required)
• Power Rating: Must be 0.125W / 1/8W (exact match required)
• Package Type: Must be Axial (exact match required)
• Composition: Must be Metal Film (exact match required)
• Operating Temperature Range: Must support -65°C to 175°C (exact match required)
• Temperature Coefficient: Must be ±50ppm/°C (exact match required)
• Series Compliance: Must conform to MIL-R-10509/7 military specification
• Tolerance: May vary within acceptable engineering limits while maintaining functional equivalence

The RN55C49R9BB14 qualifies as a direct substitute based on identical electrical characteristics, mechanical dimensions, and military specification compliance. The primary distinction is improved tolerance specification (±0.1% versus ±0.25%), which represents an upgrade in precision without compromising any other parameter.

Parameter Comparison

Engineering Selection Recommendations

Both the RN55C49R9CBSL and RN55C49R9BB14 maintain active product status and full compliance with MIL-R-10509/7 military specification requirements. Selection between these parts should be based on tolerance requirements specific to the application circuit:

• RN55C49R9CBSL is appropriate for applications where ±0.25% tolerance meets circuit performance specifications and cost optimization is a priority.
• RN55C49R9BB14 is appropriate for applications requiring tighter tolerance control at ±0.1%, providing enhanced precision for critical bias networks or precision measurement circuits.

Both parts are RoHS non-compliant and REACH-affected, with identical electrical performance across the full operating temperature range. Mechanical compatibility is confirmed through identical axial package dimensions and lead configuration. No design modifications are required when substituting between these parts.

Frequently Asked Questions (FAQ)

Q: Can RN55C49R9BB14 be used as a direct replacement for RN55C49R9CBSL?

A: Yes. The RN55C49R9BB14 is electrically and mechanically compatible with the RN55C49R9CBSL. Both parts share identical resistance values, power ratings, operating temperature ranges, and axial package dimensions. The substitute features improved tolerance specification (±0.1% versus ±0.25%), which does not create compatibility issues in standard applications.

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

A: The tolerance specification differs. RN55C49R9CBSL specifies ±0.25% tolerance, while RN55C49R9BB14 specifies ±0.1% tolerance. All other electrical and mechanical parameters are identical.

Q: Are both parts military-qualified?

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

Q: Do these parts require any PCB layout modifications when substituting?

A: No. Both parts use identical axial package dimensions (0.090" Dia × 0.240" L), lead spacing, and termination configuration. Direct board-level substitution is possible without layout changes.

Q: What is the temperature coefficient specification for both parts?

A: Both parts specify ±50ppm/°C temperature coefficient across the -65°C to 175°C operating range.

Q: Are there any compliance differences between these parts?

A: Both parts share identical RoHS and REACH compliance status. Both are RoHS non-compliant and REACH-affected, with matching ECCN (EAR99) and HTSUS (8533.21.0090) classifications.