RCS2012F51R1CS Equivalent & Substitute Parts Reference

Part Overview

The RCS2012F51R1CS is a 51.1 Ohm ±1% thick film chip resistor manufactured by Samsung Electro-Mechanics in 0805 (2012 Metric) package format with 1/8W (0.125W) power rating. This component is classified as Active product status and features anti-sulfur and moisture-resistant construction. The part is ROHS3 compliant with unlimited moisture sensitivity level (MSL 1).

Substitute parts are identified when electrical specifications (resistance value, tolerance, power rating, temperature coefficient, operating temperature range) and mechanical parameters (package type, dimensions, termination count) are identical or functionally equivalent. This reference provides engineering-grade alternatives for component sourcing, inventory management, and design flexibility.

Substiute Parts

RCS2012F51R1CS

Samsung Electro-MechanicsIn Stock: 867RCS2012F51R1CS Datasheet

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CRCW080551R1FKEA

Vishay DaleIn Stock: 85594CRCW080551R1FKEA Datasheet

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CRCW080551R1FKTA

Vishay DaleIn Stock: 6571CRCW080551R1FKTA Datasheet

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ERJ-6ENF51R1V

Panasonic Electronic ComponentsIn Stock: 145008ERJ-6ENF51R1V Datasheet

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RC0805FR-0751R1L

YAGEOIn Stock: 6301RC0805FR-0751R1L Datasheet

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RMCF0805FT51R1

Stackpole Electronics IncIn Stock: 457328RMCF0805FT51R1 Datasheet

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RMCS0805FT51R1

Stackpole Electronics IncIn Stock: 1157RMCS0805FT51R1 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RCS2012F51R1CS is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Requirements:

• Resistance value: 51.1 Ohms (exact match)
• Tolerance: ±1% (exact match)
• Power rating: 0.125W / 1/8W (exact match)
• Temperature coefficient: ±100ppm/°C (exact match)
• Operating temperature range: -55°C to +155°C (exact match)

Mechanical Equivalence Requirements:

• Package type: 0805 (2012 Metric) (exact match)
• Composition: Thick Film (exact match)
• Number of terminations: 2 (exact match)
• Physical dimensions: 0.079" L x 0.049" W / 2.00mm x 1.25mm (exact match)

Environmental & Compliance Considerations:

• MSL rating: 1 (Unlimited) - all substitutes meet this requirement
• RoHS compliance status is noted but does not disqualify substitutes
• REACH status is noted for regulatory tracking

All identified substitute parts meet the core electrical and mechanical requirements. Variations in height (seated maximum), packaging format (Tape & Reel vs. Cut Tape), and optional certifications (AEC-Q200) are secondary differentiators that do not affect functional substitutability.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

CRCW080551R1FKEA (Vishay Dale) and ERJ-6ENF51R1V (Panasonic) are recommended as primary substitutes. Both parts are ROHS3 compliant, REACH unaffected, and carry AEC-Q200 automotive qualification. CRCW080551R1FKEA offers the lowest seated height (0.020"), while ERJ-6ENF51R1V provides the highest inventory availability (144,968 units).

Secondary Substitutes (Full Electrical Equivalence):

RMCF0805FT51R1 (Stackpole Electronics) is functionally equivalent with ROHS3 compliance and AEC-Q200 rating. This part offers the highest inventory level (457,227 units) among all substitutes, supporting high-volume production requirements.

RC0805FR-0751R1L (YAGEO) is electrically and mechanically equivalent with ROHS3 compliance. This part is supplied in Cut Tape format with Digi-Reel packaging, which differs from the standard Tape & Reel format of the main part.

Conditional Substitutes:

CRCW080551R1FKTA (Vishay Dale) is electrically and mechanically equivalent but carries RoHS non-compliance and REACH affected status. This part is suitable only for applications where RoHS3 compliance is not a regulatory requirement.

RMCS0805FT51R1 (Stackpole Electronics) is electrically and mechanically equivalent with ROHS3 compliance. This part features anti-sulfur construction matching the main part's environmental protection profile. Inventory availability is limited (1,137 units).

Compliance Considerations:

For applications requiring ROHS3 compliance and REACH unaffected status, exclude CRCW080551R1FKTA. All other substitutes meet these regulatory requirements.

For applications requiring AEC-Q200 automotive qualification, select from CRCW080551R1FKEA, CRCW080551R1FKTA, ERJ-6ENF51R1V, or RMCF0805FT51R1.

Frequently Asked Questions (FAQ)

Q: Can I substitute RCS2012F51R1CS with any of the listed parts without circuit redesign?

A: Yes. All listed substitute parts are electrically and mechanically equivalent. They share identical resistance (51.1 Ω), tolerance (±1%), power rating (0.125W), temperature coefficient (±100ppm/°C), operating temperature range (-55°C to +155°C), package type (0805), and physical dimensions (0.079" L x 0.049" W). Direct substitution is supported at the circuit level.

Q: What is the significance of the height variation among substitute parts?

A: Seated height variations (ranging from 0.020" to 0.028") are secondary mechanical parameters. These differences do not affect electrical performance or standard PCB assembly processes. Height variations become relevant only in space-constrained applications with specific clearance requirements. Verify clearance specifications in your design if height is a critical constraint.

Q: Why is CRCW080551R1FKTA listed as a substitute if it is RoHS non-compliant?

A: CRCW080551R1FKTA is electrically and mechanically equivalent to the main part. It is included for reference in applications where RoHS3 compliance is not a regulatory requirement. For new designs or applications requiring RoHS3 compliance, select alternative substitutes such as CRCW080551R1FKEA, ERJ-6ENF51R1V, RMCF0805FT51R1, or RMCS0805FT51R1.

Q: What is the difference between Tape & Reel and Cut Tape packaging?

A: Tape & Reel (TR) packaging supplies components on continuous carrier tape wound on reels, suitable for automated pick-and-place assembly. Cut Tape (CT) with Digi-Reel packaging supplies components on cut tape segments, typically for lower-volume or manual assembly processes. RC0805FR-0751R1L uses Cut Tape format. Verify your assembly equipment compatibility before selecting this part.

Q: Are all substitute parts suitable for automotive applications?

A: CRCW080551R1FKEA, CRCW080551R1FKTA, ERJ-6ENF51R1V, and RMCF0805FT51R1 carry AEC-Q200 automotive qualification. RC0805FR-0751R1L and RMCS0805FT51R1 do not list AEC-Q200 certification. For automotive applications, select from the AEC-Q200 qualified parts.

Q: What inventory considerations should guide my part selection?

A: RMCF0805FT51R1 (Stackpole) offers the highest inventory (457,227 units), followed by ERJ-6ENF51R1V (Panasonic, 144,968 units) and CRCW080551R1FKEA (Vishay Dale, 85,550 units). For high-volume production or long-term supply security, prioritize parts with higher inventory levels. RMCS0805FT51R1 has limited availability (1,137 units) and is suitable only for low-volume applications.

Q: Does the anti-sulfur feature of RCS2012F51R1CS require a specific substitute?

A: The anti-sulfur feature is an environmental protection characteristic specific to the RCS2012F51R1CS and RMCS0805FT51R1. Other substitutes feature moisture resistance or standard thick film construction. Select RMCS0805FT51R1 only if anti-sulfur protection is a design requirement. For standard applications, moisture-resistant or standard thick film substitutes are functionally equivalent.

Q: Can I mix different substitute parts in the same production batch?

A: Yes. All substitute parts are electrically and mechanically equivalent. Mixing different manufacturers or part numbers in the same batch does not affect circuit performance. However, verify that your quality assurance and traceability procedures support multi-source component usage.