RN55C4991FRE6 Equivalent & Substitute Parts

Part Overview

The RN55C4991FRE6 is a 4.99 kOhms ±1% metal film through-hole resistor rated at 0.125W (1/8W) in axial package configuration. This component is part of the Vishay Dale RN55 military-grade resistor series, featuring flame retardant coating, moisture resistance, and safety certification per MIL-R-10509/7. The part is currently active in production with 1,460 units in stock. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and design optimization where tolerance or packaging specifications permit substitution.

Substiute Parts

RN55C4991FRE6

Vishay DaleIn Stock: 1500RN55C4991FRE6 Datasheet

Current PartRFQ

RN55E4991BB14

Vishay DaleIn Stock: 823RN55E4991BB14 Datasheet

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RN55E4991BRE6

Vishay DaleIn Stock: 1560RN55E4991BRE6 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RN55C4991FRE6 is determined by the following critical parameters:

• Resistance Value: Must be 4.99 kOhms (exact match required)
• Power Rating: Must be 0.125W (1/8W) minimum
• Package Type: Must be Axial configuration
• Composition: Must be Metal Film
• Operating Temperature Range: Must support -65°C to 175°C
• Series Compliance: Must conform to MIL-R-10509/7 and RN55 series specifications
• Tolerance: ±1% or tighter tolerance acceptable for direct substitution

The identified substitute parts RN55E4991BB14 and RN55E4991BRE6 meet all critical electrical and mechanical parameters. Both substitutes feature improved tolerance (±0.1% versus ±1%) and lower temperature coefficient (±25ppm/°C versus ±50ppm/°C), making them functionally superior while maintaining full compatibility with the original specification.

Parameter Comparison

Engineering Selection Recommendations

Both substitute parts RN55E4991BB14 and RN55E4991BRE6 are direct functional equivalents to the RN55C4991FRE6 and are suitable for applications requiring 4.99 kOhms ±1% metal film axial resistors within the specified temperature range.

RN55E4991BRE6 is the preferred substitute when packaging format consistency is required, as it maintains the Cut Tape (CT) format of the original part. This option provides 1,515 units in stock.

RN55E4991BB14 is available in Bulk packaging format and offers the same electrical performance with 812 units in stock. This option is suitable for applications where packaging format flexibility is acceptable.

Both substitutes provide superior tolerance (±0.1%) and improved temperature stability (±25ppm/°C) compared to the original specification, with no compromise to electrical or mechanical compatibility. All three parts maintain compliance with MIL-R-10509/7 military specifications and identical operating temperature ranges.

Frequently Asked Questions (FAQ)

Q: Can RN55E4991BB14 and RN55E4991BRE6 be used interchangeably with RN55C4991FRE6?

A: Yes. Both substitute parts meet all critical electrical parameters: 4.99 kOhms resistance, 0.125W power rating, metal film composition, and axial package configuration. The substitutes feature tighter tolerance (±0.1% versus ±1%) and lower temperature coefficient (±25ppm/°C versus ±50ppm/°C), making them functionally superior while maintaining full compatibility.

Q: What is the difference between RN55E4991BB14 and RN55E4991BRE6?

A: The primary difference is packaging format. RN55E4991BB14 is supplied in Bulk packaging, while RN55E4991BRE6 is supplied in Cut Tape (CT) format. Both parts are electrically identical with the same resistance, tolerance, power rating, and temperature specifications. Selection depends on procurement and assembly process requirements.

Q: Are the substitute parts suitable for military applications?

A: Yes. Both RN55E4991BB14 and RN55E4991BRE6 are part of the Vishay Dale RN55 military-grade resistor series and comply with MIL-R-10509/7 specifications. They feature flame retardant coating, moisture resistance, and safety certification equivalent to the original part.

Q: What is the impact of tolerance differences on circuit performance?

A: The RN55C4991FRE6 specifies ±1% tolerance, while both substitutes provide ±0.1% tolerance. Tighter tolerance results in more precise resistance values and improved circuit accuracy. Applications requiring the original ±1% tolerance can use the substitutes without performance degradation, as ±0.1% tolerance is a subset of ±1% tolerance.

Q: Are there any compliance or regulatory differences between these parts?

A: All three parts share identical RoHS non-compliant and REACH Affected status. No compliance or regulatory differences exist between the main part and substitutes.