MCR03EZPFX4321 Equivalent & Substitute Parts

Part Overview

The MCR03EZPFX4321 is a 4.32 kOhms ±1% 0.1W chip resistor in 0603 (1608 Metric) package manufactured by Rohm Semiconductor. This automotive-grade thick film resistor features AEC-Q200 qualification and operates across -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	4.32 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 MCR03EZPFX4321 is determined by strict equivalence across the following critical parameters:

Resistance value: 4.32 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)
Termination count: 2 (exact match required)
RoHS compliance: ROHS3 Compliant (exact match required)
Moisture sensitivity: MSL 1 (exact match required)

All identified substitute parts meet these criteria. Variations in physical dimensions (length, width, height) within the 0603 package specification and differences in packaging format (Tape & Reel vs. bulk) do not affect functional equivalence.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Resistance	Tolerance	Power (W)	Package	Temp Coeff	Op. Temp Range	Features	Product Status	Packaging
MCR03EZPFX4321	Rohm Semiconductor	4.32 kOhms	±1%	0.1	0603	±100ppm/°C	-55°C ~ 155°C	Automotive AEC-Q200	Discontinued	Bulk
TRR03EZPF4321	Rohm Semiconductor	4.32 kOhms	±1%	0.1	0603	±100ppm/°C	-55°C ~ 155°C	Anti-Sulfur	Obsolete	Tape & Reel
CRCW06034K32FKEA	Vishay Dale	4.32 kOhms	±1%	0.1	0603	±100ppm/°C	-55°C ~ 155°C	Automotive AEC-Q200	Active	Tape & Reel
ERJ-3EKF4321V	Panasonic Electronic Components	4.32 kOhms	±1%	0.1	0603	±100ppm/°C	-55°C ~ 155°C	Automotive AEC-Q200	Active	Tape & Reel
RMCF0603FT4K32	Stackpole Electronics Inc	4.32 kOhms	±1%	0.1	0603	±100ppm/°C	-55°C ~ 155°C	Automotive AEC-Q200	Active	Tape & Reel
CR0603-FX-4321ELF	Bourns Inc.	4.32 kOhms	±1%	0.1	0603	±100ppm/°C	-55°C ~ 155°C	Moisture Resistant	Active	Tape & Reel
RC0603FR-074K32L	YAGEO	4.32 kOhms	±1%	0.1	0603	±100ppm/°C	-55°C ~ 155°C	Moisture Resistant	Active	Tape & Reel

Engineering Selection Recommendations

For applications requiring automotive-grade qualification (AEC-Q200), select from CRCW06034K32FKEA (Vishay Dale), ERJ-3EKF4321V (Panasonic), or RMCF0603FT4K32 (Stackpole Electronics). All three are currently in active production status with established supply availability.

For non-automotive applications where AEC-Q200 certification is not mandatory, CR0603-FX-4321ELF (Bourns) and RC0603FR-074K32L (YAGEO) provide functionally equivalent alternatives with moisture-resistant thick film construction and active product status.

All substitute parts maintain ROHS3 compliance, MSL 1 rating, and identical electrical specifications. Selection should be based on supply chain availability, lead time requirements, and any application-specific certifications beyond the parameters listed.

Frequently Asked Questions (FAQ)

Q: Can MCR03EZPFX4321 be directly replaced with any of the listed substitutes?

A: Yes. All listed substitute parts are functionally equivalent based on matching resistance value (4.32 kOhms), tolerance (±1%), power rating (0.1W), package (0603), composition (thick film), temperature coefficient (±100ppm/°C), operating temperature range (-55°C ~ 155°C), and compliance certifications (ROHS3, MSL 1).

Q: What is the difference between automotive-grade and non-automotive substitutes?

A: Automotive-grade parts (CRCW06034K32FKEA, ERJ-3EKF4321V, RMCF0603FT4K32) carry AEC-Q200 qualification, indicating compliance with automotive reliability standards. Non-automotive alternatives (CR0603-FX-4321ELF, RC0603FR-074K32L) feature moisture-resistant construction but lack AEC-Q200 certification. Selection depends on application requirements.

Q: Does packaging format (Tape & Reel vs. Bulk) affect electrical performance?

A: No. Packaging format affects only handling, storage, and assembly processes. Electrical and thermal characteristics remain identical regardless of packaging format.

Q: Are there any dimensional differences between the main part and substitutes?

A: Minor dimensional variations exist within the 0603 package specification. The MCR03EZPFX4321 measures 0.063" L × 0.031" W × 0.022" H (max). Substitutes show slight variations: CRCW06034K32FKEA measures 0.061" L × 0.033" W × 0.020" H (max). These variations remain within 0603 package tolerances and do not affect PCB layout or assembly compatibility.

Q: Which substitute offers the highest inventory availability?

A: RMCF0603FT4K32 (Stackpole Electronics) shows the highest inventory level at 528,526 pieces. ERJ-3EKF4321V (Panasonic) follows with 103,530 pieces, and RC0603FR-074K32L (YAGEO) with 165,028 pieces.

Q: Can TRR03EZPF4321 be used as a substitute despite obsolete status?

A: TRR03EZPF4321 meets all electrical and mechanical equivalence criteria. However, its obsolete product status indicates discontinued manufacturing. Use only if existing inventory is available and long-term supply is not required.

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