RMCF0805FT1R21 Equivalent & Substitute Parts

Part Overview

The RMCF0805FT1R21 is a 1.21 Ohm ±1% 0.125W thick film chip resistor in 0805 (2012 Metric) package manufactured by Stackpole Electronics Inc. This automotive-grade component meets AEC-Q200 specifications and is designed for high-reliability applications requiring precision resistance values in compact form factors. The part is currently active in production with 6110 units in stock. Equivalent and substitute parts are identified to support procurement flexibility, supply chain continuity, and design optimization across compatible applications.

Substiute Parts

RMCF0805FT1R21

Stackpole Electronics IncIn Stock: 6139RMCF0805FT1R21 Datasheet

Current PartRFQ

CRCW08051K21FKEA

Vishay DaleIn Stock: 9054CRCW08051K21FKEA Datasheet

DirectRFQ

RC0805FR-071K21L

YAGEOIn Stock: 337308RC0805FR-071K21L Datasheet

DirectRFQ

RC0805FR-071R21L

YAGEOIn Stock: 13088RC0805FR-071R21L Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the RMCF0805FT1R21 are qualified based on the following critical parameters:

• Resistance Value: Exact match at 1.21 Ohms
• Tolerance: ±1% precision grade
• Power Rating: 0.125W (1/8W) minimum
• Package: 0805 (2012 Metric) form factor
• Composition: Thick film construction
• Operating Temperature: -55°C to 155°C range
• Compliance: ROHS3 and environmental certifications

Two substitute parts meet these criteria: RC0805FR-071R21L (YAGEO, manufacturer recommended) and RC0805FR-071K21L (YAGEO, direct equivalent with different resistance value). The CRCW08051K21FKEA (Vishay Dale) does not qualify as a direct substitute due to resistance value mismatch (1.21 kOhms vs. 1.21 Ohms).

Parameter Comparison

Engineering Selection Recommendations

RC0805FR-071R21L (YAGEO) is the manufacturer-recommended substitute for RMCF0805FT1R21. This part maintains exact electrical specifications including 1.21 Ohm resistance, ±1% tolerance, and ±200ppm/°C temperature coefficient. Both components share identical operating temperature range (-55°C to 155°C), power rating (0.125W), and ROHS3 compliance. The YAGEO part features moisture-resistant construction and slightly reduced maximum seated height (0.024" vs. 0.026"), making it compatible with space-constrained layouts. Both parts carry MSL 1 rating, indicating unlimited shelf life under standard storage conditions.

RC0805FR-071K21L (YAGEO) is not suitable as a direct substitute due to resistance value of 1.21 kOhms, which differs by three orders of magnitude from the required 1.21 Ohms. This part is listed in the provided substitute data but does not meet the electrical requirements for equivalent substitution.

CRCW08051K21FKEA (Vishay Dale) is not a valid substitute due to resistance value mismatch (1.21 kOhms vs. 1.21 Ohms) and automotive AEC-Q200 rating absence, despite meeting package and power rating specifications.

Frequently Asked Questions (FAQ)

Q: Can RC0805FR-071R21L replace RMCF0805FT1R21 in automotive applications?

A: Yes. RC0805FR-071R21L meets all critical electrical and mechanical parameters required for direct substitution, including 1.21 Ohm resistance, ±1% tolerance, 0.125W power rating, 0805 package, and -55°C to 155°C operating range. Both components are ROHS3 compliant with MSL 1 rating. The YAGEO part is designated as the manufacturer-recommended substitute.

Q: Why is RC0805FR-071K21L listed as a substitute if the resistance value differs?

A: RC0805FR-071K21L (1.21 kOhms) is not a valid substitute for RMCF0805FT1R21 (1.21 Ohms). The resistance values differ by a factor of 1000, making this part unsuitable for equivalent substitution. This part appears in the provided data but does not meet substitution criteria.

Q: Are there height differences between the main part and substitute?

A: Yes. RMCF0805FT1R21 has a maximum seated height of 0.026" (0.65mm), while RC0805FR-071R21L has a maximum seated height of 0.024" (0.60mm). This 0.002" difference is within typical PCB assembly tolerances and does not prevent substitution in standard applications.

Q: What is the difference between Automotive AEC-Q200 and Moisture Resistant features?

A: RMCF0805FT1R21 carries Automotive AEC-Q200 certification, indicating qualification for automotive reliability standards. RC0805FR-071R21L features moisture-resistant construction. Both designations address different reliability aspects; AEC-Q200 focuses on automotive-grade performance, while moisture resistance addresses environmental protection. The YAGEO substitute meets the required operating temperature and compliance specifications for equivalent substitution.

Q: Can these parts be used interchangeably in new designs?

A: RC0805FR-071R21L can be used as a direct equivalent in new designs requiring 1.21 Ohm ±1% 0.125W 0805 resistors. Both parts meet identical electrical specifications, temperature range, and compliance requirements. Design validation should confirm compatibility with specific application requirements, particularly regarding automotive certification needs.