RMCS1206FT78K7 Equivalent & Substitute Parts

Part Overview

The RMCS1206FT78K7 is a 78.7 kOhms ±1% 0.25W chip resistor in 1206 (3216 Metric) package manufactured by Stackpole Electronics Inc. This thick film resistor features anti-sulfur composition and is designed for general-purpose applications requiring precision resistance values with tight tolerance specifications. The part is currently active in production. Substitute parts may be required due to supply chain constraints, regional availability, or specific application requirements such as automotive qualification or enhanced moisture resistance.

Key Parameters

Parameter	Value
Resistance	78.7 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 for the RMCS1206FT78K7 is determined by the following critical parameters:

Resistance value: 78.7 kOhms (exact match required)
Tolerance: ±1% (exact match required)
Power rating: 0.25W / 1/4W (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 (exact match required)
Moisture Sensitivity Level: 1 (Unlimited) (exact match required)

All four substitute parts meet these criteria. Variations in secondary features such as moisture resistance enhancement or automotive qualification do not affect functional interchangeability for standard applications.

Parameter Comparison

Parameter	RMCS1206FT78K7 (Stackpole)	CR1206-FX-7872ELF (Bourns)	CRCW120678K7FKEA (Vishay Dale)	ERJ-8ENF7872V (Panasonic)	RC1206FR-0778K7L (YAGEO)
Resistance	78.7 kOhms	78.7 kOhms	78.7 kOhms	78.7 kOhms	78.7 kOhms
Tolerance	±1%	±1%	±1%	±1%	±1%
Power Rating	0.25W	0.25W	0.25W	0.25W	0.25W
Package	1206 (3216 Metric)	1206 (3216 Metric)	1206 (3216 Metric)	1206 (3216 Metric)	1206 (3216 Metric)
Composition	Thick Film	Thick Film	Thick Film	Thick Film	Thick Film
Temperature Coefficient	±100ppm/°C	±100ppm/°C	±100ppm/°C	±100ppm/°C	±100ppm/°C
Operating Temperature	-55°C ~ 155°C	-55°C ~ 155°C	-55°C ~ 155°C	-55°C ~ 155°C	-55°C ~ 155°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Active	Active	Active	Not For New Designs	Active

Engineering Selection Recommendations

All four substitute parts are functionally equivalent to the RMCS1206FT78K7 based on the critical electrical and mechanical parameters. Selection should be based on the following considerations:

CR1206-FX-7872ELF (Bourns Inc.) and RC1206FR-0778K7L (YAGEO) are recommended for general-purpose applications. Both parts are in active production status with high inventory availability and feature moisture-resistant thick film composition.

CRCW120678K7FKEA (Vishay Dale) is recommended for automotive applications requiring AEC-Q200 qualification. This part maintains active production status and is suitable for designs with automotive environmental requirements.

ERJ-8ENF7872V (Panasonic Electronic Components) carries a "Not For New Designs" product status designation. While functionally equivalent and currently in stock, this part should not be selected for new design implementations. It may be considered only for legacy system maintenance or replacement applications where the original design specified this component.

Frequently Asked Questions (FAQ)

Q: Can I substitute the RMCS1206FT78K7 with any of these parts without circuit redesign?

A: Yes. All substitute parts match the critical parameters: 78.7 kOhms resistance, ±1% tolerance, 0.25W power rating, 1206 package, ±100ppm/°C temperature coefficient, and -55°C to 155°C operating range. No circuit redesign is required.

Q: What is the difference between the anti-sulfur feature of the RMCS1206FT78K7 and the moisture-resistant feature of the Bourns and YAGEO substitutes?

A: Both features are secondary enhancements to the thick film composition. Anti-sulfur and moisture-resistant formulations address different environmental stressors but do not affect the core electrical specifications. Selection between these variants depends on the specific environmental conditions of the application.

Q: Why is the Panasonic ERJ-8ENF7872V marked "Not For New Designs"?

A: This designation indicates that the manufacturer has discontinued active development and promotion of this part for new applications. While the part remains functionally equivalent and in stock, it should not be specified in new designs. Use this part only for replacement or maintenance of existing systems.

Q: Are there dimensional differences between these parts that affect PCB layout?

A: Minor dimensional variations exist within the 1206 package specification. The RMCS1206FT78K7 has a maximum seated height of 0.026" (0.65mm), while substitutes range from 0.024" to 0.030" (0.60mm to 0.75mm). These variations fall within standard 1206 package tolerances and do not require PCB layout modifications.

Q: Do all these parts meet the same compliance standards?

A: Yes. All parts are ROHS3 compliant, REACH unaffected, classified as EAR99, and carry MSL rating 1 (Unlimited). All parts meet the same regulatory and environmental compliance requirements.

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