RMCS1206FT4K02 Equivalent & Substitute Parts

Part Overview

The RMCS1206FT4K02 is a 4.02 kOhms ±1% 0.25W thick film chip resistor in 1206 (3216 Metric) package manufactured by Stackpole Electronics Inc. This anti-sulfur resistor operates across -55°C to 155°C with a temperature coefficient of ±100ppm/°C. The part is ROHS3 compliant with unlimited moisture sensitivity rating (MSL 1).

Equivalent and substitute parts are necessary when the primary part becomes unavailable, when design requirements shift toward automotive-qualified components, or when enhanced performance characteristics such as pulse withstanding capability or higher power ratings are required within the same package footprint.

Key Parameters

Parameter	Value
Resistance	4.02 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 to 155°C
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict adherence to the following parameters:

Resistance Value: Must be 4.02 kOhms
Tolerance: Must be ±1%
Package: Must be 1206 (3216 Metric)
Composition: Must be Thick Film
Temperature Coefficient: Must be ±100ppm/°C
Operating Temperature Range: Must be -55°C to 155°C
Terminations: Must be 2

Substitute parts are grouped into three categories based on additional features:

Category 1 - Standard Equivalents (0.25W): Parts meeting all core parameters with standard thick film construction.

Category 2 - Automotive AEC-Q200 Qualified (0.25W): Parts meeting all core parameters with automotive qualification, suitable for automotive applications.

Category 3 - Enhanced Performance (0.5W - 0.75W): Parts meeting all core parameters with increased power ratings or pulse withstanding capability, providing design margin in power-sensitive applications.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Resistance	Tolerance	Power (W)	Package	Temp Coeff	Operating Temp	Features	RoHS Status	Product Status
RMCS1206FT4K02	Stackpole Electronics Inc	4.02 kΩ	±1%	0.25	1206	±100ppm/°C	-55°C ~ 155°C	Anti-Sulfur	ROHS3	Active
RMCF1206FT4K02	Stackpole Electronics Inc	4.02 kΩ	±1%	0.25	1206	±100ppm/°C	-55°C ~ 155°C	Automotive AEC-Q200	ROHS3	Active
AC1206FR-074K02L	YAGEO	4.02 kΩ	±1%	0.25	1206	±100ppm/°C	-55°C ~ 155°C	Automotive AEC-Q200, Moisture Resistant	ROHS3	Active
CR1206-FX-4021ELF	Bourns Inc.	4.02 kΩ	±1%	0.25	1206	±100ppm/°C	-55°C ~ 155°C	Moisture Resistant	ROHS3	Active
CRCW12064K02FKEA	Vishay Dale	4.02 kΩ	±1%	0.25	1206	±100ppm/°C	-55°C ~ 155°C	Automotive AEC-Q200	ROHS3	Active
CRCW12064K02FKEAHP	Vishay Dale	4.02 kΩ	±1%	0.75	1206	±100ppm/°C	-55°C ~ 155°C	Automotive AEC-Q200, Pulse Withstanding	ROHS3	Active
CRCW12064K02FKTA	Vishay Dale	4.02 kΩ	±1%	0.25	1206	±100ppm/°C	-55°C ~ 155°C	Automotive AEC-Q200	RoHS Non-compliant	Active
ERJ-8ENF4021V	Panasonic Electronic Components	4.02 kΩ	±1%	0.25	1206	±100ppm/°C	-55°C ~ 155°C	Automotive AEC-Q200	ROHS3	Not For New Designs
ESR18EZPF4021	Rohm Semiconductor	4.02 kΩ	±1%	0.5	1206	±100ppm/°C	-55°C ~ 155°C	Automotive AEC-Q200, Pulse Withstanding	ROHS3	Active
RC1206FR-074K02L	YAGEO	4.02 kΩ	±1%	0.25	1206	±100ppm/°C	-55°C ~ 155°C	Moisture Resistant	ROHS3	Active

Engineering Selection Recommendations

For Direct Replacement (Active Status, ROHS3 Compliant, Standard 0.25W)

RMCF1206FT4K02 (Stackpole Electronics Inc) provides the closest functional equivalent with automotive AEC-Q200 qualification and active product status. CRCW12064K02FKEA (Vishay Dale) and AC1206FR-074K02L (YAGEO) are equivalent alternatives with automotive qualification and moisture resistance features.

For Automotive Applications

RMCF1206FT4K02, CRCW12064K02FKEA, AC1206FR-074K02L, and ESR18EZPF4021 all carry AEC-Q200 automotive qualification. ESR18EZPF4021 and CRCW12064K02FKEAHP provide increased power ratings (0.5W and 0.75W respectively) with pulse withstanding capability for applications requiring additional thermal margin.

For Non-Automotive Applications

CR1206-FX-4021ELF (Bourns Inc.) and RC1206FR-074K02L (YAGEO) provide moisture-resistant thick film construction without automotive qualification, suitable for general industrial applications.

Parts to Avoid for New Designs

ERJ-8ENF4021V (Panasonic Electronic Components) carries "Not For New Designs" status and should not be selected for new product development. CRCW12064K02FKTA (Vishay Dale) is RoHS non-compliant and REACH affected, making it unsuitable for applications requiring regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can I substitute RMCS1206FT4K02 with any of the listed parts?

A: Direct substitution is possible only with parts matching all core parameters: 4.02 kOhms resistance, ±1% tolerance, 1206 package, thick film composition, ±100ppm/°C temperature coefficient, and -55°C to 155°C operating range. All listed parts meet these criteria. However, product status and compliance requirements must align with your application needs.

Q: What is the difference between the standard RMCS and automotive-qualified RMCF versions?

A: Both are manufactured by Stackpole Electronics Inc with identical electrical specifications. The RMCF variant includes AEC-Q200 automotive qualification, making it suitable for automotive applications where this certification is required. The RMCS version is suitable for general industrial applications.

Q: Why would I choose a higher power rating like CRCW12064K02FKEAHP (0.75W) over the standard 0.25W?

A: Higher power ratings provide thermal margin in applications with elevated ambient temperatures or where pulse withstanding capability is required. The 0.75W variant maintains the same package footprint and electrical characteristics while offering enhanced reliability in demanding conditions.

Q: Is the anti-sulfur feature of RMCS1206FT4K02 critical for substitution?

A: Anti-sulfur protection is a specific feature of the RMCS series. If your application requires this feature, verify that substitute parts include equivalent protection. Most listed alternatives do not explicitly specify anti-sulfur treatment but are suitable for general industrial environments.

Q: Can I use ERJ-8ENF4021V in new designs?

A: No. ERJ-8ENF4021V carries "Not For New Designs" status from Panasonic Electronic Components. This designation indicates the manufacturer is discontinuing or has discontinued this product line. New designs should select from parts with "Active" product status.

Q: What compliance certifications should I verify for my application?

A: All listed parts are ROHS3 compliant except CRCW12064K02FKTA. For automotive applications, verify AEC-Q200 qualification. For applications requiring REACH compliance, avoid CRCW12064K02FKTA which is marked as REACH Affected. All other parts are REACH Unaffected.

Q: Are there dimensional differences between substitute parts?

A: While all parts use the 1206 package, dimensional tolerances vary slightly. Typical length ranges from 0.122" to 0.126" and height from 0.024" to 0.030". Verify specific dimensions against your PCB layout and assembly equipment specifications before finalizing part selection.

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