18 Ohm 1% 1/4W 1206 Chip Resistor Equivalent & Substitute Parts (RCS3216F180CS)

Part Overview

The RCS3216F180CS is a 18 Ohm ±1% 0.25W thick film chip resistor in 1206 (3216 Metric) package manufactured by Samsung Electro-Mechanics. This component is classified as Active product status with anti-sulfur and moisture resistant properties. The part is ROHS3 compliant and operates across -55°C to 155°C temperature range.

Substitute parts are identified when equivalent electrical specifications and mechanical compatibility are maintained across the same package format. Alternative manufacturers provide functionally equivalent components suitable for direct replacement in applications where the original part may be unavailable or where design requirements permit qualified alternatives.

Key Parameters

Parameter	Value
Resistance	18 Ohms
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)
Number of Terminations	2

Substitute Part Grouping Explanation

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

Mandatory Matching Parameters:

Resistance value: 18 Ohms
Tolerance: ±1%
Package format: 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)

Power Rating Consideration: Substitute parts are grouped into two categories based on power dissipation capacity. The primary group maintains 0.25W (1/4W) rating identical to the main part. One substitute (CRCW120618R0FKEAHP) provides 0.75W (3/4W) rating, which exceeds the original specification and is suitable for applications requiring higher power margin within the same package envelope.

Certification Variations: Substitute parts include automotive-qualified variants (AEC-Q200) and standard industrial grades. These certifications do not affect electrical or mechanical compatibility but indicate additional qualification testing performed by manufacturers.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Resistance	Tolerance	Power (Watts)	Package	Temp Coeff	Operating Temp	Features	Product Status	RoHS
RCS3216F180CS	Samsung Electro-Mechanics	18 Ω	±1%	0.25W	1206	±100ppm/°C	-55°C ~ 155°C	Anti-Sulfur, Moisture Resistant	Active	ROHS3
AC1206FR-0718RL	YAGEO	18 Ω	±1%	0.25W	1206	±100ppm/°C	-55°C ~ 155°C	Automotive AEC-Q200, Moisture Resistant	Active	ROHS3
CR1206-FX-18R0ELF	Bourns Inc.	18 Ω	±1%	0.25W	1206	±100ppm/°C	-55°C ~ 155°C	Moisture Resistant	Active	ROHS3
CRCW120618R0FKEA	Vishay Dale	18 Ω	±1%	0.25W	1206	±100ppm/°C	-55°C ~ 155°C	Automotive AEC-Q200	Active	ROHS3
CRCW120618R0FKEAHP	Vishay Dale	18 Ω	±1%	0.75W	1206	±100ppm/°C	-55°C ~ 155°C	Automotive AEC-Q200, Pulse Withstanding	Active	ROHS3
ERJ-8ENF18R0V	Panasonic Electronic Components	18 Ω	±1%	0.25W	1206	±100ppm/°C	-55°C ~ 155°C	Automotive AEC-Q200	Not For New Designs	ROHS3
RC1206FR-0718RL	YAGEO	18 Ω	±1%	0.25W	1206	±100ppm/°C	-55°C ~ 155°C	Moisture Resistant	Active	ROHS3
RMCF1206FT18R0	Stackpole Electronics Inc	18 Ω	±1%	0.25W	1206	±100ppm/°C	-55°C ~ 155°C	Automotive AEC-Q200	Active	ROHS3

Engineering Selection Recommendations

Primary Substitutes (Recommended for New Designs):

CR1206-FX-18R0ELF (Bourns Inc.) is the preferred substitute based on Active product status, highest inventory availability (15,593 pcs), and standard industrial-grade qualification. This part maintains identical electrical and mechanical specifications with no feature restrictions.

CRCW120618R0FKEA (Vishay Dale) and RMCF1206FT18R0 (Stackpole Electronics Inc) are suitable alternatives with automotive AEC-Q200 qualification. Both maintain Active status and provide enhanced reliability documentation for applications requiring automotive-grade components.

Secondary Substitutes (Conditional Use):

AC1206FR-0718RL (YAGEO) and RC1206FR-0718RL (YAGEO) are functionally equivalent with Active status. These parts are suitable for applications where YAGEO qualification is preferred or where supply chain diversification is required.

CRCW120618R0FKEAHP (Vishay Dale) provides 0.75W power rating within the same 1206 package. This part is suitable for applications where higher power dissipation margin is required without package size increase. Automotive AEC-Q200 qualification and pulse withstanding capability are additional features.

Not Recommended for New Designs:

ERJ-8ENF18R0V (Panasonic Electronic Components) carries "Not For New Designs" product status. While electrically and mechanically equivalent, this part should be used only for legacy system maintenance or where existing design qualification specifically requires this component.

Frequently Asked Questions (FAQ)

Q: Can CRCW120618R0FKEAHP (0.75W) be used as a direct replacement for RCS3216F180CS (0.25W)?

A: Yes. The 0.75W part is mechanically and electrically compatible. Higher power rating provides additional thermal margin without affecting circuit operation. The 1206 package dimensions remain identical. Use is appropriate when power dissipation margin improvement is beneficial.

Q: What is the difference between automotive-qualified (AEC-Q200) and standard industrial substitutes?

A: Automotive-qualified parts (AC1206FR-0718RL, CRCW120618R0FKEA, CRCW120618R0FKEAHP, ERJ-8ENF18R0V, RMCF1206FT18R0) undergo additional qualification testing per AEC-Q200 standard. Standard industrial parts (CR1206-FX-18R0ELF, RC1206FR-0718RL) meet general industrial requirements. Both groups are ROHS3 compliant and operate across identical temperature ranges. Selection depends on application requirements and existing design qualification.

Q: Why is ERJ-8ENF18R0V marked "Not For New Designs"?

A: This designation indicates the manufacturer has discontinued active development and recommends alternative parts for new applications. The part remains functionally equivalent and suitable for legacy system support or maintenance. New designs should specify alternative active-status parts.

Q: Are all substitute parts available in Tape & Reel (TR) packaging?

A: Yes. All listed substitute parts are supplied in Tape & Reel packaging format, consistent with the original part's standard surface mount assembly requirements.

Q: What is the significance of Moisture Sensitivity Level 1 (Unlimited)?

A: MSL 1 indicates the component has unlimited shelf life without moisture bake-out requirements. All listed parts maintain MSL 1 rating, ensuring identical handling and storage procedures across all substitutes.

Q: Can these parts be used interchangeably in existing PCB designs?

A: Yes. All substitute parts maintain identical 1206 package dimensions, pin spacing, and electrical specifications. Direct PCB footprint compatibility is confirmed. No design modifications are required for substitution.

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