MCR03EZPFX21R5 Equivalent & Substitute Parts

Part Overview

The MCR03EZPFX21R5 is a 21.5 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	21.5 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
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the MCR03EZPFX21R5 is determined by strict equivalence across the following parameters:

Resistance value: 21.5 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)

Substitute parts are classified into two categories:

Direct Substitutes maintain full automotive AEC-Q200 certification and are functionally identical across all electrical and mechanical parameters.

Similar Substitutes meet all core electrical and mechanical specifications but feature moisture-resistant construction instead of automotive AEC-Q200 rating. These parts are suitable for applications where automotive qualification is not required.

Parameter Comparison

Part Number	Manufacturer	Resistance	Tolerance	Power (W)	Package	Temp Coeff	Operating Temp	AEC-Q200	Product Status	Packaging Type
MCR03EZPFX21R5	Rohm Semiconductor	21.5 Ω	±1%	0.1	0603	±100ppm/°C	-55°C ~ 155°C	Yes	Discontinued	Bulk
MCR03ERTF21R5	Rohm Semiconductor	21.5 Ω	±1%	0.1	0603	±100ppm/°C	-55°C ~ 155°C	No	Discontinued	Cut Tape / Digi-Reel
CRCW060321R5FKEA	Vishay Dale	21.5 Ω	±1%	0.1	0603	±100ppm/°C	-55°C ~ 155°C	Yes	Active	Tape & Reel
ERJ-3EKF21R5V	Panasonic Electronic Components	21.5 Ω	±1%	0.1	0603	±100ppm/°C	-55°C ~ 155°C	Yes	Active	Tape & Reel
RMCF0603FT21R5	Stackpole Electronics Inc	21.5 Ω	±1%	0.1	0603	±100ppm/°C	-55°C ~ 155°C	Yes	Active	Tape & Reel
CR0603-FX-21R5ELF	Bourns Inc.	21.5 Ω	±1%	0.1	0603	±100ppm/°C	-55°C ~ 155°C	No	Active	Tape & Reel
RC0603FR-0721R5L	YAGEO	21.5 Ω	±1%	0.1	0603	±100ppm/°C	-55°C ~ 155°C	No	Active	Tape & Reel

Engineering Selection Recommendations

For Automotive Applications Requiring AEC-Q200 Certification:

Select from active production parts with AEC-Q200 rating: CRCW060321R5FKEA (Vishay Dale), ERJ-3EKF21R5V (Panasonic Electronic Components), or RMCF0603FT21R5 (Stackpole Electronics Inc). All three maintain full compliance with automotive qualification standards and are currently in active production with established supply chains.

For Non-Automotive Applications:

CR0603-FX-21R5ELF (Bourns Inc.) and RC0603FR-0721R5L (YAGEO) are suitable alternatives. Both parts meet all electrical and mechanical specifications with moisture-resistant construction and active product status. RC0603FR-0721R5L offers the highest inventory availability.

For Rohm Semiconductor Continuity:

MCR03ERTF21R5 maintains manufacturer continuity as a Rohm Semiconductor product, though it is discontinued. This part is suitable only if existing supply exists and automotive qualification is not required.

Frequently Asked Questions (FAQ)

Q: Can I use a non-AEC-Q200 rated substitute in an automotive application?

A: No. If your application requires automotive qualification, select only from parts with active AEC-Q200 certification: CRCW060321R5FKEA, ERJ-3EKF21R5V, or RMCF0603FT21R5.

Q: What is the difference between the packaging options listed?

A: Bulk packaging is suitable for prototype and low-volume applications. Cut Tape and Digi-Reel packaging are designed for automated assembly processes. Tape & Reel packaging is standard for high-volume production. All packaging formats contain electrically identical components.

Q: Are all substitute parts pin-compatible with the original MCR03EZPFX21R5?

A: Yes. All listed substitutes use the 0603 (1608 Metric) package with two terminations. Physical dimensions vary slightly within tolerance (length 1.55mm to 1.60mm, height 0.50mm to 0.55mm), but all are compatible with standard 0603 PCB footprints.

Q: Which substitute has the best supply availability?

A: RC0603FR-0721R5L (YAGEO) has the highest inventory at 144,769 pieces. For automotive applications, ERJ-3EKF21R5V (Panasonic) offers 89,640 pieces in stock.

Q: Can I mix different substitute manufacturers in the same production run?

A: Yes. All listed substitutes meet identical electrical specifications (21.5 Ohms ±1%, 0.1W, ±100ppm/°C, -55°C to 155°C). However, for consistency in thermal behavior and long-term reliability, using a single manufacturer source per production batch is recommended.

Q: What does "Moisture Resistant" mean versus AEC-Q200?

A: Moisture-resistant construction provides enhanced protection against humidity ingress. AEC-Q200 is an automotive qualification standard that includes moisture resistance testing plus additional automotive-specific reliability requirements. Select based on your application's environmental and regulatory requirements.

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