MCR18ERTF1821 Equivalent & Substitute Parts

Part Overview

The MCR18ERTF1821 is a 1.82 kOhms ±1% 0.25W thick film chip resistor in 1206 (3216 Metric) package manufactured by Rohm Semiconductor. This part is discontinued at DiGi Electronics, necessitating identification of equivalent alternatives that maintain identical electrical and mechanical specifications. Substitute parts must match the resistance value, tolerance, power rating, package dimensions, and operating temperature range to ensure direct compatibility in existing designs.

Key Parameters

Parameter	Specification
Resistance Value	1.82 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: 1.82 kOhms
Tolerance: ±1%
Power rating: 0.25W (1/4W)
Package: 1206 (3216 Metric)
Composition: Thick Film
Temperature coefficient: ±100ppm/°C
Operating temperature range: -55°C ~ 155°C
RoHS compliance: ROHS3 Compliant
Moisture sensitivity: MSL 1 (Unlimited)

All listed substitute parts meet these core electrical and mechanical requirements. Additional features such as automotive AEC-Q200 certification or moisture resistance represent enhancements that do not prevent substitution but may provide additional design margin for specific applications.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Resistance	Tolerance	Power (W)	Package	Temp Coeff	Op Temp Range	Product Status	Features
MCR18ERTF1821	Rohm Semiconductor	1.82 kΩ	±1%	0.25	1206	±100ppm/°C	-55°C ~ 155°C	Discontinued	—
CR1206-FX-1821ELF	Bourns Inc.	1.82 kΩ	±1%	0.25	1206	±100ppm/°C	-55°C ~ 155°C	Active	Moisture Resistant
CRCW12061K82FKEA	Vishay Dale	1.82 kΩ	±1%	0.25	1206	±100ppm/°C	-55°C ~ 155°C	Active	Automotive AEC-Q200
ERJ-8ENF1821V	Panasonic Electronic Components	1.82 kΩ	±1%	0.25	1206	±100ppm/°C	-55°C ~ 155°C	Not For New Designs	Automotive AEC-Q200
RC1206FR-071K82L	YAGEO	1.82 kΩ	±1%	0.25	1206	±100ppm/°C	-55°C ~ 155°C	Active	Moisture Resistant
RMCF1206FT1K82	Stackpole Electronics Inc	1.82 kΩ	±1%	0.25	1206	±100ppm/°C	-55°C ~ 155°C	Active	Automotive AEC-Q200
AC1206FR-071K82L	YAGEO	1.82 kΩ	±1%	0.25	1206	±100ppm/°C	-55°C ~ 155°C	Active	Automotive AEC-Q200, Moisture Resistant

Engineering Selection Recommendations

Primary Substitutes (Active Status, Full Compliance)

CR1206-FX-1821ELF, CRCW12061K82FKEA, RC1206FR-071K82L, RMCF1206FT1K82, and AC1206FR-071K82L are all active products with ROHS3 compliance and MSL 1 rating. These parts are suitable for direct replacement in new production and redesign efforts.

Automotive Applications

CRCW12061K82FKEA, RMCF1206FT1K82, and AC1206FR-071K82L carry AEC-Q200 automotive qualification. AC1206FR-071K82L combines both AEC-Q200 certification and moisture resistance, providing the highest specification margin for demanding automotive environments.

Legacy Designs

ERJ-8ENF1821V is marked "Not For New Designs" and should be avoided for new development. However, it remains electrically and mechanically equivalent for existing production support where supply continuity is required.

Moisture-Sensitive Applications

CR1206-FX-1821ELF, RC1206FR-071K82L, and AC1206FR-071K82L feature moisture resistance, suitable for applications requiring enhanced environmental protection.

Frequently Asked Questions (FAQ)

Q: Can any of these substitute parts be used as a direct drop-in replacement for MCR18ERTF1821?

A: Yes. All listed substitute parts match the core electrical specifications (1.82 kΩ ±1%, 0.25W), temperature coefficient (±100ppm/°C), operating temperature range (-55°C ~ 155°C), package dimensions (1206), and compliance ratings (ROHS3, MSL 1). Physical dimensions vary slightly within manufacturing tolerances but remain within 1206 package specifications.

Q: What is the difference between parts with and without AEC-Q200 certification?

A: AEC-Q200 certification indicates automotive-grade qualification with enhanced reliability testing and traceability. Parts without this certification are suitable for general industrial and consumer applications. The presence of AEC-Q200 does not prevent use in non-automotive applications.

Q: Why is ERJ-8ENF1821V marked "Not For New Designs"?

A: This designation indicates the manufacturer has transitioned the product to end-of-life status. While electrically and mechanically equivalent, it should not be selected for new product development. Use only when supporting existing production with established supply agreements.

Q: Are there dimensional differences between substitute parts?

A: Minor dimensional variations exist within the 1206 package specification. Length ranges from 0.120" to 0.126" (3.05mm to 3.20mm), width from 0.061" to 0.063" (1.55mm to 1.60mm), and height from 0.024" to 0.030" (0.60mm to 0.75mm). These variations are within standard PCB design tolerances and do not affect interchangeability.

Q: Which substitute part offers the best overall specification?

A: AC1206FR-071K82L combines active product status, AEC-Q200 automotive certification, moisture resistance, and compact dimensions (0.026" seated height). This part provides the highest specification margin across environmental and reliability criteria.

Q: Can moisture-resistant variants be used in non-moisture-sensitive applications?

A: Yes. Moisture-resistant composition is a superset of standard thick film performance and does not introduce incompatibilities in standard applications. These parts are suitable for any application requiring standard 1206 resistors.

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