MCR18ERTF4321 Equivalent & Substitute Parts

Part Overview

The MCR18ERTF4321 is a 4.32 kOhms ±1% 0.25W thick film chip resistor in 1206 (3216 Metric) surface mount package manufactured by Rohm Semiconductor. This part is discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives from active manufacturers. Substitute parts must maintain identical electrical specifications and mechanical compatibility to ensure direct board-level replacement without design modification.

Key Parameters

Parameter	Value
Resistance	4.32 kOhms
Tolerance	±1%
Power Rating	0.25W (1/4W)
Package / Case	1206 (3216 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

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

Resistance value: 4.32 kOhms (exact match required)
Tolerance: ±1% (exact match required)
Power rating: 0.25W (exact match required)
Package: 1206 (3216 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)
RoHS compliance: ROHS3 Compliant (required for regulatory alignment)
MSL rating: 1 (Unlimited) (required for storage and handling compatibility)

All identified substitute parts meet these criteria. Variations in physical dimensions (length, width, height) within the 1206 package specification and differences in features (moisture resistance, automotive qualification) do not affect functional substitutability but may influence application-specific selection.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Resistance	Tolerance	Power (W)	Package	Temp Coeff	Op Temp Range	Product Status	RoHS	MSL
MCR18ERTF4321	Rohm Semiconductor	4.32 kΩ	±1%	0.25	1206	±100ppm/°C	-55~155°C	Discontinued	ROHS3	1
CR1206-FX-4321ELF	Bourns Inc.	4.32 kΩ	±1%	0.25	1206	±100ppm/°C	-55~155°C	Active	ROHS3	1
CRCW12064K32FKEA	Vishay Dale	4.32 kΩ	±1%	0.25	1206	±100ppm/°C	-55~155°C	Active	ROHS3	1
CRCW12064K32FKEAC	Vishay Dale	4.32 kΩ	±1%	0.25	1206	±100ppm/°C	-55~155°C	Active	ROHS3	1
ERJ-8ENF4321V	Panasonic Electronic Components	4.32 kΩ	±1%	0.25	1206	±100ppm/°C	-55~155°C	Not For New Designs	ROHS3	1
RC1206FR-074K32L	YAGEO	4.32 kΩ	±1%	0.25	1206	±100ppm/°C	-55~155°C	Active	ROHS3	1
RMCF1206FT4K32	Stackpole Electronics Inc	4.32 kΩ	±1%	0.25	1206	±100ppm/°C	-55~155°C	Active	ROHS3	1

Engineering Selection Recommendations

For direct replacement of the discontinued MCR18ERTF4321, the following selection criteria apply:

Primary Selection (Active Status): CR1206-FX-4321ELF (Bourns), CRCW12064K32FKEA (Vishay Dale), CRCW12064K32FKEAC (Vishay Dale), RC1206FR-074K32L (YAGEO), and RMCF1206FT4K32 (Stackpole Electronics) are all in active production status and represent the most reliable long-term sourcing options.

Automotive Applications: CRCW12064K32FKEA, CRCW12064K32FKEAC, RMCF1206FT4K32, and ERJ-8ENF4321V carry AEC-Q200 automotive qualification. Selection of these parts is appropriate for automotive or mission-critical applications requiring automotive-grade component certification.

Moisture Resistance Feature: CR1206-FX-4321ELF and RC1206FR-074K32L include moisture-resistant construction. These parts are suitable for applications with elevated humidity exposure or stringent environmental requirements.

Legacy Designs: ERJ-8ENF4321V carries "Not For New Designs" status and should be avoided for new product development, though it remains available for legacy system maintenance and repair.

All substitute parts maintain identical electrical performance and thermal characteristics. Selection between active alternatives should be based on application requirements (automotive qualification, moisture resistance), supply chain availability, and cost considerations.

Frequently Asked Questions (FAQ)

Q: Can any of these substitute parts be used interchangeably with the MCR18ERTF4321?

A: Yes. All listed substitute parts meet the core electrical and mechanical specifications: 4.32 kOhms ±1%, 0.25W power rating, 1206 package, ±100ppm/°C temperature coefficient, and -55°C to 155°C operating range. They are electrically and mechanically interchangeable at the board level without design modification.

Q: What is the difference between parts with and without automotive qualification?

A: Parts marked AEC-Q200 (CRCW12064K32FKEA, CRCW12064K32FKEAC, RMCF1206FT4K32, ERJ-8ENF4321V) have undergone automotive-grade reliability testing and qualification. Non-automotive parts (CR1206-FX-4321ELF, RC1206FR-074K32L) are suitable for general industrial and consumer applications. Automotive qualification is required only if the application demands it.

Q: What does "moisture resistant" mean for resistors?

A: Moisture-resistant thick film construction (CR1206-FX-4321ELF, RC1206FR-074K32L) provides enhanced protection against humidity-induced performance degradation. Both the original MCR18ERTF4321 and all substitutes carry MSL rating 1 (Unlimited), indicating they do not require special moisture control during storage or handling. Moisture resistance is an additional feature, not a requirement for substitution.

Q: Why is ERJ-8ENF4321V marked "Not For New Designs"?

A: This designation indicates the manufacturer has discontinued active development and recommends against using this part in new product designs. It remains available for existing system support and repair. For new designs, select from parts with "Active" status.

Q: Are there any physical dimension differences I should be aware of?

A: All parts conform to the 1206 (3216 Metric) package specification. Minor variations in length (0.120" to 0.126"), width (0.061" to 0.063"), and height (0.024" to 0.030") exist within package tolerance. These variations do not affect PCB footprint compatibility or assembly processes. Standard 1206 land patterns accommodate all listed parts.

Q: Which substitute part has the best availability?

A: Inventory levels vary by supplier and time. RC1206FR-074K32L (YAGEO) and ERJ-8ENF4321V (Panasonic) show the highest listed inventory quantities. For current availability, consult active component distributors.

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