MCR03EZPFX66R5 Equivalent & Substitute Parts

Part Overview

The MCR03EZPFX66R5 is a 66.5 Ohm ±1% 0.1W thick film chip resistor in 0603 (1608 Metric) package manufactured by Rohm Semiconductor. This component is rated for automotive applications under AEC-Q200 standard with an operating temperature range of -55°C to 155°C. The part is currently discontinued at DiGi Electronics, making equivalent substitutes necessary for ongoing production and maintenance applications.

Key Parameters

Parameter	Value
Resistance	66.5 Ohms
Tolerance	±1%
Power Rating	0.1W (1/10W)
Package / Case	0603 (1608 Metric)
Composition	Thick Film
Temperature Coefficient	±100ppm/°C
Operating Temperature Range	-55°C to 155°C
Number of Terminations	2
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the MCR03EZPFX66R5 is determined by strict equivalence across the following critical parameters:

Resistance value: 66.5 Ohms
Tolerance: ±1%
Power rating: 0.1W (1/10W)
Package: 0603 (1608 Metric)
Composition: Thick Film
Temperature coefficient: ±100ppm/°C
Operating temperature range: -55°C to 155°C
RoHS3 compliance
MSL rating: 1 (Unlimited)

All substitute parts listed meet these electrical and mechanical specifications. Direct substitutes maintain full automotive AEC-Q200 certification. The YAGEO RC0603FR-0766R5L is classified as a similar substitute due to moisture-resistant features rather than explicit AEC-Q200 automotive rating, but maintains all core electrical and mechanical parameters.

Parameter Comparison

Part Number	Manufacturer	Resistance	Tolerance	Power (W)	Package	Temp Coeff	Op. Temp Range	AEC-Q200	Status	Inventory
MCR03EZPFX66R5	Rohm Semiconductor	66.5 Ω	±1%	0.1	0603	±100ppm/°C	-55°C to 155°C	Yes	Discontinued	889 Pcs
CRCW060366R5FKEA	Vishay Dale	66.5 Ω	±1%	0.1	0603	±100ppm/°C	-55°C to 155°C	Yes	Active	4116 Pcs
ERJ-3EKF66R5V	Panasonic Electronic Components	66.5 Ω	±1%	0.1	0603	±100ppm/°C	-55°C to 155°C	Yes	Active	135928 Pcs
RMCF0603FT66R5	Stackpole Electronics Inc	66.5 Ω	±1%	0.1	0603	±100ppm/°C	-55°C to 155°C	Yes	Active	22779 Pcs
RC0603FR-0766R5L	YAGEO	66.5 Ω	±1%	0.1	0603	±100ppm/°C	-55°C to 155°C	No	Active	320778 Pcs

Engineering Selection Recommendations

For applications requiring automotive AEC-Q200 certification, the direct substitutes CRCW060366R5FKEA (Vishay Dale), ERJ-3EKF66R5V (Panasonic Electronic Components), and RMCF0603FT66R5 (Stackpole Electronics Inc) are fully qualified replacements. All three maintain active product status with established supply availability.

The ERJ-3EKF66R5V offers the highest inventory level at 135,928 pieces, providing supply chain stability. The CRCW060366R5FKEA and RMCF0603FT66R5 are also actively produced with substantial stock levels.

The RC0603FR-0766R5L from YAGEO meets all electrical and mechanical specifications with moisture-resistant construction. This part is suitable for non-automotive applications or where automotive certification is not mandated. YAGEO RC0603FR-0766R5L maintains the largest inventory at 320,778 pieces.

All substitute parts are ROHS3 compliant with MSL rating of 1 (Unlimited), matching the original part's environmental and regulatory status.

Frequently Asked Questions (FAQ)

Q: Can I use RC0603FR-0766R5L as a direct replacement for MCR03EZPFX66R5 in automotive applications?

A: The RC0603FR-0766R5L meets all electrical and mechanical specifications but lacks explicit AEC-Q200 automotive certification. Use only in non-automotive applications or where automotive qualification is not required.

Q: What is the primary difference between the substitute parts?

A: All direct substitutes (CRCW060366R5FKEA, ERJ-3EKF66R5V, RMCF0603FT66R5) maintain AEC-Q200 automotive certification. The YAGEO RC0603FR-0766R5L features moisture-resistant construction without automotive rating. Electrical and mechanical parameters are identical across all parts.

Q: Are there physical dimension differences between substitutes?

A: Minor dimensional variations exist within tolerance. The MCR03EZPFX66R5 and ERJ-3EKF66R5V measure 0.063" L x 0.031" W (1.60mm x 0.80mm). The CRCW060366R5FKEA and RMCF0603FT66R5 measure 0.061" L x 0.031" W (1.55mm x 0.80mm). All fit the 0603 (1608 Metric) package specification. Height differences are negligible (0.020" to 0.022" maximum seated height).

Q: Which substitute offers the best supply availability?

A: The ERJ-3EKF66R5V from Panasonic Electronic Components provides the highest inventory level at 135,928 pieces with active product status. The YAGEO RC0603FR-0766R5L offers 320,778 pieces if automotive certification is not required.

Q: Do all substitutes maintain the same temperature coefficient and operating range?

A: Yes. All substitute parts maintain ±100ppm/°C temperature coefficient and -55°C to 155°C operating temperature range, matching the original MCR03EZPFX66R5 specification.

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