MCR03EZPFX4121 Equivalent & Substitute Parts

Part Overview

The MCR03EZPFX4121 is a 4.12 kOhms ±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, necessitating identification of functionally equivalent alternatives from active manufacturers to maintain design continuity and supply chain reliability.

Key Parameters

Parameter	Value
Resistance	4.12 kOhms
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 ~ 155°C
Number of Terminations	2
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the MCR03EZPFX4121 is determined by strict equivalence across the following critical parameters:

Resistance Value: 4.12 kOhms (exact match required)
Tolerance: ±1% (exact match required)
Power Rating: 0.1W / 1/10W (exact match required)
Package: 0603 (1608 Metric) (exact match required)
Composition: Thick Film (exact match required)
Temperature Coefficient: ±100ppm/°C (exact match required)
Operating Temperature Range: -55°C ~ 155°C (exact match required)
Terminations: 2 (exact match required)
RoHS Compliance: ROHS3 Compliant (exact match required)
Moisture Sensitivity Level: 1 (Unlimited) (exact match required)

All substitute parts listed below meet these criteria. Substitutes are categorized as Direct (functionally and mechanically identical with automotive AEC-Q200 rating) or Similar (functionally equivalent with moisture-resistant features but without explicit AEC-Q200 automotive rating).

Parameter Comparison

Manufacturer Part Number	Manufacturer	Resistance	Tolerance	Power (W)	Package	Composition	Temp Coeff	Operating Temp	Features	Product Status	RoHS	MSL
MCR03EZPFX4121	Rohm Semiconductor	4.12 kΩ	±1%	0.1	0603	Thick Film	±100ppm/°C	-55°C ~ 155°C	Automotive AEC-Q200	Discontinued	ROHS3	1
CRCW06034K12FKEA	Vishay Dale	4.12 kΩ	±1%	0.1	0603	Thick Film	±100ppm/°C	-55°C ~ 155°C	Automotive AEC-Q200	Active	ROHS3	1
ERJ-3EKF4121V	Panasonic Electronic Components	4.12 kΩ	±1%	0.1	0603	Thick Film	±100ppm/°C	-55°C ~ 155°C	Automotive AEC-Q200	Active	ROHS3	1
RMCF0603FT4K12	Stackpole Electronics Inc	4.12 kΩ	±1%	0.1	0603	Thick Film	±100ppm/°C	-55°C ~ 155°C	Automotive AEC-Q200	Active	ROHS3	1
CR0603-FX-4121ELF	Bourns Inc.	4.12 kΩ	±1%	0.1	0603	Thick Film	±100ppm/°C	-55°C ~ 155°C	Moisture Resistant	Active	ROHS3	1
RC0603FR-074K12L	YAGEO	4.12 kΩ	±1%	0.1	0603	Thick Film	±100ppm/°C	-55°C ~ 155°C	Moisture Resistant	Active	ROHS3	1

Engineering Selection Recommendations

Direct Substitutes (Automotive AEC-Q200 Rated):

CRCW06034K12FKEA (Vishay Dale), ERJ-3EKF4121V (Panasonic Electronic Components), and RMCF0603FT4K12 (Stackpole Electronics Inc) are direct functional equivalents with active product status and full automotive AEC-Q200 compliance. These parts maintain identical electrical specifications, package dimensions, and environmental ratings as the original MCR03EZPFX4121. All three are available in high inventory quantities and are suitable for direct replacement in automotive applications requiring AEC-Q200 qualification.

Similar Substitutes (Moisture-Resistant, Non-Automotive Rated):

CR0603-FX-4121ELF (Bourns Inc.) and RC0603FR-074K12L (YAGEO) are functionally equivalent alternatives with active product status and moisture-resistant features. These parts meet all electrical and mechanical specifications but lack explicit automotive AEC-Q200 certification. Selection of these alternatives is appropriate for non-automotive applications or where moisture resistance is a primary design requirement and automotive qualification is not mandated.

Frequently Asked Questions (FAQ)

Q: Can I use CR0603-FX-4121ELF or RC0603FR-074K12L in an automotive application originally designed for MCR03EZPFX4121?

A: CR0603-FX-4121ELF and RC0603FR-074K12L lack explicit automotive AEC-Q200 certification. If your design requires AEC-Q200 compliance, use CRCW06034K12FKEA, ERJ-3EKF4121V, or RMCF0603FT4K12 instead.

Q: Are all substitute parts physically compatible with the original PCB footprint?

A: All substitute parts use the 0603 (1608 Metric) package. Physical dimensions vary slightly between manufacturers (length ranges from 1.55mm to 1.60mm, height from 0.50mm to 0.55mm), but these variations remain within standard 0603 footprint tolerances and are compatible with standard PCB designs.

Q: What is the difference between Direct and Similar substitutes?

A: Direct substitutes (CRCW06034K12FKEA, ERJ-3EKF4121V, RMCF0603FT4K12) carry automotive AEC-Q200 certification matching the original part. Similar substitutes (CR0603-FX-4121ELF, RC0603FR-074K12L) meet all electrical and mechanical specifications but feature moisture-resistant composition without automotive qualification.

Q: Which substitute offers the best inventory availability?

A: RC0603FR-074K12L (YAGEO) has the highest inventory level at 57,401 pieces. ERJ-3EKF4121V (Panasonic) follows with 105,341 pieces. All listed substitutes maintain substantial stock levels suitable for production requirements.

Q: Are all substitutes RoHS3 compliant?

A: Yes, all substitute parts listed are ROHS3 compliant with Moisture Sensitivity Level 1 (Unlimited), matching the original MCR03EZPFX4121 specifications.

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