MCR18ERTFL2R21 Equivalent & Substitute Parts

Part Overview

The MCR18ERTFL2R21 is a 2.21 Ohm ±1% 0.25W thick film chip resistor in 1206 (3216 Metric) package manufactured by Rohm Semiconductor. This component is discontinued at DiGi Electronics, necessitating identification of equivalent alternatives that maintain identical electrical specifications and mechanical compatibility. Substitute parts must match the resistance value, tolerance, power rating, package dimensions, and environmental operating range to ensure direct replacement capability in existing designs.

Substiute Parts

MCR18ERTFL2R21

Rohm SemiconductorIn Stock: 963MCR18ERTFL2R21 Datasheet

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RC1206FR-072R21L

YAGEOIn Stock: 3842RC1206FR-072R21L Datasheet

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RMCF1206FT2R21

Stackpole Electronics IncIn Stock: 5946345RMCF1206FT2R21 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

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

• Resistance value: 2.21 Ohms (exact match required)
• Tolerance: ±1% (exact match required)
• Power rating: 0.25W (exact match required)
• Package: 1206 (3216 Metric) (exact match required)
• Composition: Thick Film (exact match required)
• Operating temperature range: -55°C ~ 155°C (minimum requirement)
• RoHS compliance: ROHS3 Compliant (minimum requirement)
• Moisture sensitivity: MSL 1 (minimum requirement)

Both identified substitute parts meet all mandatory electrical and mechanical parameters. Dimensional variations within supplier tolerances and differences in temperature coefficient or additional certifications do not affect functional substitutability.

Parameter Comparison

Engineering Selection Recommendations

RC1206FR-072R21L (YAGEO) is suitable for general-purpose applications requiring standard thick film resistor performance. This part is actively manufactured and widely available, with moisture-resistant construction and improved temperature coefficient (±200ppm/°C) compared to the original MCR18ERTFL2R21.

RMCF1206FT2R21 (Stackpole Electronics Inc) is specified for automotive applications with AEC-Q200 qualification. This part provides the same electrical performance with automotive-grade reliability and is actively produced with high inventory availability. The AEC-Q200 rating qualifies this component for use in automotive and harsh-environment applications where enhanced reliability standards are required.

Both substitutes are ROHS3 compliant and maintain MSL 1 rating, ensuring compatibility with standard manufacturing and storage conditions.

Frequently Asked Questions (FAQ)

Q: Can RC1206FR-072R21L directly replace MCR18ERTFL2R21 in existing PCB designs?

A: Yes. Both parts share identical resistance (2.21 Ohms), tolerance (±1%), power rating (0.25W), package (1206), and operating temperature range (-55°C ~ 155°C). The 1206 package footprint is standardized, permitting direct substitution without PCB layout modification.

Q: What is the significance of the temperature coefficient difference between the original and substitute parts?

A: The original MCR18ERTFL2R21 has a temperature coefficient of ±250ppm/°C, while both substitutes specify ±200ppm/°C. A lower temperature coefficient indicates improved stability across the operating temperature range. This represents a performance improvement and does not restrict substitutability.

Q: When should RMCF1206FT2R21 be selected over RC1206FR-072R21L?

A: RMCF1206FT2R21 is specified for automotive and mission-critical applications requiring AEC-Q200 qualification. If the application requires automotive-grade reliability or operates in harsh environments, RMCF1206FT2R21 is the appropriate selection. For standard industrial and consumer applications, either part is acceptable.

Q: Are there dimensional differences between these parts that affect PCB assembly?

A: Minor dimensional variations exist within supplier tolerances. The MCR18ERTFL2R21 measures 0.120" L × 0.061" W with 0.026" maximum height. RC1206FR-072R21L measures 0.122" L × 0.063" W with 0.026" maximum height. RMCF1206FT2R21 measures 0.126" L × 0.063" W with 0.028" maximum height. All variations remain within 1206 package specifications and do not affect standard PCB footprints.

Q: Do all substitute parts meet RoHS and moisture sensitivity requirements?

A: Yes. All three parts are ROHS3 compliant and carry MSL 1 (Unlimited) rating, meeting standard environmental and handling requirements for commercial and industrial applications.