RCS2012F4991CS Equivalent & Substitute Parts Reference

Part Overview

The RCS2012F4991CS is a 4.99 kOhms ±1% 0.125W (1/8W) thick film chip resistor manufactured by Samsung Electro-Mechanics in 0805 (2012 Metric) package format. This component features anti-sulfur and moisture-resistant properties, operating across -55°C to 155°C with a temperature coefficient of ±100ppm/°C. The part is ROHS3 compliant with MSL 1 (Unlimited) rating and maintains Active product status. Equivalent and substitute parts are identified based on matching electrical specifications, mechanical dimensions, and environmental performance characteristics to ensure direct functional interchangeability in circuit applications.

Substiute Parts

RCS2012F4991CS

Samsung Electro-MechanicsIn Stock: 734RCS2012F4991CS Datasheet

Current PartRFQ

AF0805FR-074K99L

YAGEOIn Stock: 4237AF0805FR-074K99L Datasheet

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AC0805FR-074K99L

YAGEOIn Stock: 66342AC0805FR-074K99L Datasheet

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CRCW08054K99FKEA

Vishay DaleIn Stock: 266040CRCW08054K99FKEA Datasheet

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CRCW08054K99FKEAHP

Vishay DaleIn Stock: 120344CRCW08054K99FKEAHP Datasheet

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CRCW08054K99FKTA

Vishay DaleIn Stock: 66408CRCW08054K99FKTA Datasheet

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ERJ-6ENF4991V

Panasonic Electronic ComponentsIn Stock: 79722ERJ-6ENF4991V Datasheet

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RC0805FR-074K99L

YAGEOIn Stock: 9274RC0805FR-074K99L Datasheet

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RCS08054K99FKEA

Vishay DaleIn Stock: 11157RCS08054K99FKEA Datasheet

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RMCF0805FT4K99

Stackpole Electronics IncIn Stock: 61187RMCF0805FT4K99 Datasheet

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RMCS0805FT4K99

Stackpole Electronics IncIn Stock: 996RMCS0805FT4K99 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the RCS2012F4991CS are classified based on strict electrical and mechanical parameter matching. The primary substitution criteria are:

Critical Matching Parameters:

• Resistance value: 4.99 kOhms
• Tolerance: ±1%
• Package format: 0805 (2012 Metric)
• Composition: Thick Film
• Temperature coefficient: ±100ppm/°C
• Operating temperature range: -55°C ~ 155°C
• Termination count: 2

Secondary Consideration:

• Power rating: Parts rated at 0.125W (1/8W) are direct equivalents. Parts rated at 0.5W (1/2W) are functional substitutes with enhanced power handling capability but identical electrical characteristics at standard operating conditions.

All substitute parts listed maintain ROHS3 compliance, MSL 1 rating, and Active product status. Packaging format variations (Tape & Reel vs. Cut Tape) do not affect electrical or mechanical compatibility.

Parameter Comparison

Engineering Selection Recommendations

Direct Equivalents (0.125W, 1/8W Rating):

Parts AF0805FR-074K99L, AC0805FR-074K99L, CRCW08054K99FKEA, ERJ-6ENF4991V, RC0805FR-074K99L, RMCF0805FT4K99, and RMCS0805FT4K99 are direct electrical and mechanical equivalents to RCS2012F4991CS. All maintain identical resistance, tolerance, power rating, package dimensions, and operating temperature specifications. Selection among these parts depends on feature requirements and compliance certifications.

ROHS3 Compliant Substitutes:

AF0805FR-074K99L, AC0805FR-074K99L, CRCW08054K99FKEA, ERJ-6ENF4991V, RC0805FR-074K99L, RMCF0805FT4K99, RMCS0805FT4K99, and RCS08054K99FKEA all maintain ROHS3 compliance matching the original part. CRCW08054K99FKTA is RoHS non-compliant and should be selected only when legacy compliance requirements apply.

Automotive-Qualified Alternatives:

AF0805FR-074K99L, AC0805FR-074K99L, CRCW08054K99FKEA, ERJ-6ENF4991V, RMCF0805FT4K99, and RCS08054K99FKEA carry AEC-Q200 automotive qualification. These parts are suitable for applications requiring automotive-grade component certification.

Enhanced Power Handling:

CRCW08054K99FKEAHP and RCS08054K99FKEA are rated at 0.5W (1/2W) with pulse withstanding capability. These parts maintain all other electrical parameters identical to the 0.125W versions and provide additional margin for transient power dissipation in high-stress circuit conditions.

Feature-Specific Selection:

• Anti-Sulfur + Moisture Resistant: RCS2012F4991CS (original), RMCS0805FT4K99
• Anti-Sulfur only: AF0805FR-074K99L
• Moisture Resistant only: AC0805FR-074K99L, RC0805FR-074K99L
• Standard (no special features): CRCW08054K99FKEA, ERJ-6ENF4991V, RMCF0805FT4K99

Frequently Asked Questions (FAQ)

Q: Can CRCW08054K99FKEAHP (0.5W) be used as a direct replacement for RCS2012F4991CS (0.125W)?

A: Yes. The 0.5W part is electrically and mechanically compatible. It provides identical resistance, tolerance, and temperature characteristics. The higher power rating does not affect circuit operation at standard current levels and offers additional thermal margin. Physical dimensions remain within 0805 package specifications.

Q: What is the difference between Tape & Reel (TR) and Cut Tape (CT) packaging?

A: Packaging format affects component handling and assembly logistics only. Electrical and mechanical specifications remain identical. TR packaging is suitable for automated pick-and-place assembly; CT packaging is used for manual assembly or lower-volume applications. Both formats are compatible with standard PCB assembly processes.

Q: Are all listed substitutes ROHS3 compliant?

A: All substitutes except CRCW08054K99FKTA are ROHS3 compliant. CRCW08054K99FKTA is RoHS non-compliant and should be selected only when legacy or non-regulated applications require it.

Q: Which substitute parts carry automotive qualification?

A: AF0805FR-074K99L, AC0805FR-074K99L, CRCW08054K99FKEA, CRCW08054K99FKEAHP, CRCW08054K99FKTA, ERJ-6ENF4991V, RCS08054K99FKEA, and RMCF0805FT4K99 all carry AEC-Q200 automotive qualification. The original RCS2012F4991CS does not list AEC-Q200 certification.

Q: What is the significance of the ±100ppm/°C temperature coefficient?

A: The temperature coefficient defines resistance change per degree Celsius across the operating range. All listed parts maintain ±100ppm/°C, ensuring predictable resistance drift from -55°C to 155°C. This specification is critical for precision analog circuits and temperature-compensated applications.

Q: Can I substitute a part with different height specifications?

A: Height variations within the 0805 package specification (0.50mm to 0.70mm maximum seated height) do not affect electrical performance or standard PCB assembly compatibility. Height differences may impact clearance in space-constrained applications; verify mechanical fit in your specific circuit layout.

Q: What does MSL 1 (Unlimited) moisture sensitivity mean?

A: MSL 1 indicates the component requires no special moisture protection during storage or handling. All listed parts maintain MSL 1 rating, eliminating the need for dry-pack storage or baking procedures prior to assembly.

Q: Are there inventory considerations when selecting substitutes?

A: Inventory levels vary significantly among manufacturers. CRCW08054K99FKEA (Vishay Dale) shows highest availability at 265,993 pieces. AC0805FR-074K99L (YAGEO) has 66,297 pieces available. Verify current stock with your component supplier for production scheduling.