MCR03EZPFX2491 Equivalent & Substitute Parts

Part Overview

The MCR03EZPFX2491 is a 2.49 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, making equivalent substitutes necessary for ongoing production and maintenance applications.

Key Parameters

Parameter	Value
Resistance	2.49 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
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the MCR03EZPFX2491 are classified into two categories based on feature alignment:

Direct Substitutes (Automotive AEC-Q200 Rated): CRCW06032K49FKEA, CRCW06032K49FKEB, ERJ-3EKF2491V, and RMCF0603FT2K49 are direct functional equivalents. These parts match all critical electrical parameters: 2.49 kOhms resistance, ±1% tolerance, 0.1W power rating, and 0603 package. All maintain the ±100ppm/°C temperature coefficient and -55°C to 155°C operating range. Critically, all direct substitutes retain AEC-Q200 automotive qualification, ensuring compliance with automotive reliability standards.

Similar Substitutes (Moisture Resistant, Non-Automotive Rated): CR0603-FX-2491ELF and RC0603FR-072K49L match all electrical specifications and package dimensions but feature moisture-resistant construction instead of automotive AEC-Q200 certification. These parts are suitable for applications where automotive qualification is not required but environmental protection is beneficial.

Key Parameters Determining Substitution:

Resistance value: 2.49 kOhms (exact match required)
Tolerance: ±1% (exact match required)
Power rating: 0.1W (exact match required)
Package: 0603 (1608 Metric) (exact match required)
Temperature coefficient: ±100ppm/°C (exact match required)
Operating temperature: -55°C ~ 155°C (exact match required)
Automotive qualification: AEC-Q200 (for direct substitutes only)

Parameter Comparison

Part Number	Manufacturer	Resistance	Tolerance	Power (W)	Package	Temp Coeff	Op. Temp Range	AEC-Q200	Status
MCR03EZPFX2491	Rohm Semiconductor	2.49 kΩ	±1%	0.1	0603	±100ppm/°C	-55°C ~ 155°C	Yes	Discontinued
CRCW06032K49FKEA	Vishay Dale	2.49 kΩ	±1%	0.1	0603	±100ppm/°C	-55°C ~ 155°C	Yes	Active
CRCW06032K49FKEB	Vishay Dale	2.49 kΩ	±1%	0.1	0603	±100ppm/°C	-55°C ~ 155°C	Yes	Discontinued
ERJ-3EKF2491V	Panasonic Electronic Components	2.49 kΩ	±1%	0.1	0603	±100ppm/°C	-55°C ~ 155°C	Yes	Active
RMCF0603FT2K49	Stackpole Electronics Inc	2.49 kΩ	±1%	0.1	0603	±100ppm/°C	-55°C ~ 155°C	Yes	Active
CR0603-FX-2491ELF	Bourns Inc.	2.49 kΩ	±1%	0.1	0603	±100ppm/°C	-55°C ~ 155°C	No	Active
RC0603FR-072K49L	YAGEO	2.49 kΩ	±1%	0.1	0603	±100ppm/°C	-55°C ~ 155°C	No	Active

Engineering Selection Recommendations

For Automotive Applications: Select from direct substitutes with active product status: ERJ-3EKF2491V (Panasonic) or RMCF0603FT2K49 (Stackpole). Both maintain AEC-Q200 automotive qualification and are currently in active production. CRCW06032K49FKEA (Vishay Dale) is also qualified but verify availability through your supply chain. Avoid CRCW06032K49FKEB due to discontinued status.

For Non-Automotive Applications: CR0603-FX-2491ELF (Bourns) and RC0603FR-072K49L (YAGEO) are suitable alternatives. Both are active products with moisture-resistant construction. RC0603FR-072K49L offers the highest inventory availability.

Compliance Considerations: All substitute parts maintain ROHS3 compliance, REACH unaffected status, and MSL 1 (unlimited) moisture sensitivity rating, matching the original part's environmental certifications.

Frequently Asked Questions (FAQ)

Q: Can I use CR0603-FX-2491ELF or RC0603FR-072K49L in place of MCR03EZPFX2491 in automotive circuits?

A: These parts match all electrical and mechanical specifications but lack AEC-Q200 automotive certification. Use only in non-automotive applications or where automotive qualification is not a design requirement.

Q: What is the difference between direct and similar substitutes?

A: Direct substitutes (CRCW06032K49FKEA, CRCW06032K49FKEB, ERJ-3EKF2491V, RMCF0603FT2K49) carry AEC-Q200 automotive qualification. Similar substitutes (CR0603-FX-2491ELF, RC0603FR-072K49L) feature moisture-resistant construction but are not automotive-rated. Selection depends on application requirements.

Q: Are there any dimensional differences between these parts?

A: All parts use the 0603 (1608 Metric) package. Minor variations exist in seated height (0.020" to 0.022") and length/width tolerances (1.55mm to 1.60mm L, 0.80mm to 0.85mm W), but these fall within standard PCB design tolerances and do not affect interchangeability.

Q: Which substitute has the best availability?

A: RC0603FR-072K49L (YAGEO) shows the highest inventory at 500,200 pieces. For automotive-qualified parts, RMCF0603FT2K49 (Stackpole) has 215,558 pieces in stock.

Q: Do all substitutes have the same temperature coefficient?

A: Yes. All listed substitutes maintain ±100ppm/°C temperature coefficient and -55°C to 155°C operating range, matching the original MCR03EZPFX2491 specification.

Q: Is the 0603 package the same across all manufacturers?

A: Yes. All parts conform to the 0603 (1608 Metric) standard package specification, ensuring mechanical compatibility with existing PCB layouts and pick-and-place equipment.

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