MCR03EZPFX45R3 Equivalent & Substitute Parts

Part Overview

The MCR03EZPFX45R3 is a 45.3 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	45.3 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 eligibility for the MCR03EZPFX45R3 is determined by strict equivalence across the following parameters:

Resistance value: 45.3 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
Termination count: 2
RoHS compliance: ROHS3 Compliant
Moisture sensitivity: MSL 1

All substitute parts listed meet these core electrical and mechanical specifications. Substitutes are categorized as either Direct (functionally identical with automotive AEC-Q200 rating) or Similar (functionally identical with moisture-resistant features but without explicit automotive AEC-Q200 designation).

Parameter Comparison

Manufacturer Part Number	Manufacturer	Resistance	Tolerance	Power (W)	Package	Temp Coeff	Operating Temp	AEC-Q200	Product Status	Inventory
MCR03EZPFX45R3	Rohm Semiconductor	45.3 Ω	±1%	0.1	0603	±100ppm/°C	-55°C ~ 155°C	Yes	Discontinued	774 Pcs
CRCW060345R3FKEA	Vishay Dale	45.3 Ω	±1%	0.1	0603	±100ppm/°C	-55°C ~ 155°C	Yes	Active	10362 Pcs
ERJ-3EKF45R3V	Panasonic Electronic Components	45.3 Ω	±1%	0.1	0603	±100ppm/°C	-55°C ~ 155°C	Yes	Active	470207 Pcs
RMCF0603FT45R3	Stackpole Electronics Inc	45.3 Ω	±1%	0.1	0603	±100ppm/°C	-55°C ~ 155°C	Yes	Active	27715 Pcs
CR0603-FX-45R3ELF	Bourns Inc.	45.3 Ω	±1%	0.1	0603	±100ppm/°C	-55°C ~ 155°C	No	Active	25010 Pcs
RC0603FR-0745R3L	YAGEO	45.3 Ω	±1%	0.1	0603	±100ppm/°C	-55°C ~ 155°C	No	Active	68291 Pcs

Engineering Selection Recommendations

For applications requiring automotive AEC-Q200 compliance, direct substitutes are CRCW060345R3FKEA (Vishay Dale), ERJ-3EKF45R3V (Panasonic Electronic Components), and RMCF0603FT45R3 (Stackpole Electronics Inc). All three maintain identical electrical specifications and automotive certification status. ERJ-3EKF45R3V offers the highest inventory availability at 470,207 pieces.

For non-automotive applications or where moisture-resistant thick film composition is acceptable without explicit automotive rating, CR0603-FX-45R3ELF (Bourns Inc.) and RC0603FR-0745R3L (YAGEO) are functionally equivalent alternatives. Both are active products with substantial inventory levels.

All substitute parts are ROHS3 compliant, MSL 1 rated, and maintain identical package dimensions and termination specifications.

Frequently Asked Questions (FAQ)

Q: Can CR0603-FX-45R3ELF or RC0603FR-0745R3L be used in automotive applications requiring AEC-Q200?

A: CR0603-FX-45R3ELF and RC0603FR-0745R3L are not designated as AEC-Q200 rated. For automotive applications requiring this certification, use CRCW060345R3FKEA, ERJ-3EKF45R3V, or RMCF0603FT45R3.

Q: Are all substitute parts physically compatible with the original MCR03EZPFX45R3 footprint?

A: All substitute parts use the 0603 (1608 Metric) package. Physical dimensions vary slightly within tolerance (length 1.55mm to 1.60mm, width 0.80mm to 0.85mm, height 0.50mm to 0.55mm), but all are compatible with standard 0603 PCB footprints.

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

A: Direct substitutes (CRCW060345R3FKEA, ERJ-3EKF45R3V, RMCF0603FT45R3) carry AEC-Q200 automotive certification matching the original part. Similar substitutes (CR0603-FX-45R3ELF, RC0603FR-0745R3L) provide equivalent electrical performance with moisture-resistant features but without automotive rating designation.

Q: Are all substitutes RoHS compliant?

A: Yes. All listed substitute parts are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity rating, matching the original MCR03EZPFX45R3 specifications.

Q: Which substitute offers the best availability?

A: ERJ-3EKF45R3V (Panasonic Electronic Components) provides the highest inventory level at 470,207 pieces with active product status and full AEC-Q200 compliance.

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