RCS3216F4221CS Equivalent & Substitute Parts Reference

Part Overview

The RCS3216F4221CS is a 4.22 kOhms ±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 characteristics. The part is ROHS3 compliant and suitable for general industrial applications requiring stable resistance values across the -55°C to 155°C operating temperature range.

Equivalent and substitute parts are identified based on matching electrical specifications (resistance value, tolerance, power rating, temperature coefficient) and mechanical compatibility (package type, dimensions, termination count). Substitutes enable procurement flexibility when the primary part experiences supply constraints or when design requirements permit alternative qualified sources.

Key Parameters

Parameter	Value	Specification Basis
Resistance	4.22 kOhms	Exact match required
Tolerance	±1%	Exact match required
Power Rating	0.25W (1/4W)	Exact match required
Package / Case	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
Number of Terminations	2	Exact match required
RoHS Status	ROHS3 Compliant	Compliance requirement
Moisture Sensitivity Level	1 (Unlimited)	Handling and storage

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence across all electrical and mechanical parameters. The following criteria establish substitutability for the RCS3216F4221CS:

Mandatory Matching Parameters:

Resistance value: 4.22 kOhms (no tolerance variation)
Tolerance: ±1% (no deviation)
Power rating: 0.25W / 1/4W (no reduction)
Package designation: 1206 (3216 Metric) (no alternative packages)
Composition: Thick Film (no alternative technologies)
Temperature coefficient: ±100ppm/°C (no deviation)
Operating temperature range: -55°C ~ 155°C (minimum requirement)
Termination count: 2 (standard for chip resistors)

Compliance Requirements:

ROHS3 compliance (mandatory for environmental regulations)
Moisture Sensitivity Level 1 (unlimited shelf life)

All identified substitute parts meet these criteria. Dimensional variations within the 1206 package specification (length 0.122" to 0.126", height 0.024" to 0.030") are acceptable as they remain within standard PCB footprint tolerances for 1206 components.

Parameter Comparison

Parameter	RCS3216F4221CS (Samsung)	AC1206FR-074K22L (YAGEO)	CR1206-FX-4221ELF (Bourns)	CRCW12064K22FKEA (Vishay Dale)	ERJ-8ENF4221V (Panasonic)	RC1206FR-074K22L (YAGEO)
Resistance	4.22 kOhms	4.22 kOhms	4.22 kOhms	4.22 kOhms	4.22 kOhms	4.22 kOhms
Tolerance	±1%	±1%	±1%	±1%	±1%	±1%
Power Rating	0.25W	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)	1206 (3216 Metric)
Composition	Thick Film	Thick Film	Thick Film	Thick Film	Thick Film	Thick Film
Temperature Coefficient	±100ppm/°C	±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	-55°C ~ 155°C
Terminations	2	2	2	2	2	2
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Active	Active	Active	Active	Not For New Designs	Active

Engineering Selection Recommendations

Primary Substitutes (Active Product Status):

AC1206FR-074K22L (YAGEO) and RC1206FR-074K22L (YAGEO) are functionally equivalent to the RCS3216F4221CS with Active product status. Both parts carry ROHS3 compliance and MSL 1 rating. The AC1206FR-074K22L includes automotive AEC-Q200 qualification, suitable for applications requiring automotive-grade reliability. The RC1206FR-074K22L provides standard industrial-grade performance. Both are available in Tape & Reel packaging.

CR1206-FX-4221ELF (Bourns Inc.) is an Active product with full electrical and mechanical equivalence. This part offers moisture-resistant thick film construction and is suitable for general industrial applications requiring stable performance across the specified temperature range.

CRCW12064K22FKEA (Vishay Dale) is an Active product with automotive AEC-Q200 qualification. This part is recommended for applications requiring automotive-grade reliability and environmental compliance. The AEC-Q200 rating indicates qualification for automotive temperature cycling and reliability testing.

Secondary Substitute (Not For New Designs):

ERJ-8ENF4221V (Panasonic Electronic Components) carries a "Not For New Designs" product status designation. While electrically and mechanically equivalent with automotive AEC-Q200 qualification, this part should not be selected for new circuit designs. It remains suitable only for replacement or maintenance of existing assemblies using this component.

Selection Basis:

For new designs, select from Active-status parts: AC1206FR-074K22L, RC1206FR-074K22L, CR1206-FX-4221ELF, or CRCW12064K22FKEA. For automotive applications, prioritize AC1206FR-074K22L or CRCW12064K22FKEA due to AEC-Q200 qualification. For general industrial applications, CR1206-FX-4221ELF or RC1206FR-074K22L provide equivalent performance at potentially lower cost.

Frequently Asked Questions (FAQ)

Q: Can I substitute the RCS3216F4221CS with any of the listed parts without PCB redesign?

A: Yes. All listed substitute parts use the identical 1206 (3216 Metric) package with two terminations. Dimensional variations (length 0.122" to 0.126", height 0.024" to 0.030") remain within standard 1206 PCB footprint tolerances. No PCB layout modifications are required.

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

A: AEC-Q200 qualification indicates the part has undergone automotive-grade reliability testing including temperature cycling, moisture resistance, and failure rate validation. Parts with AEC-Q200 (AC1206FR-074K22L, CRCW12064K22FKEA, ERJ-8ENF4221V) are suitable for automotive and high-reliability applications. Parts without this rating (CR1206-FX-4221ELF, RC1206FR-074K22L) are suitable for general industrial applications.

Q: Why is ERJ-8ENF4221V marked "Not For New Designs"?

A: This designation indicates the manufacturer has discontinued active development and recommends against using this part in new circuit designs. The part remains available for existing inventory and replacement purposes but should not be selected for new product development.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification, meeting environmental and hazardous substance restrictions for electronic components.

Q: What does MSL 1 (Unlimited) mean for these resistors?

A: Moisture Sensitivity Level 1 indicates the component has unlimited shelf life without special moisture-control storage requirements. These parts do not require dry-pack storage or baking before soldering, simplifying inventory management and procurement logistics.

Q: Can I mix different substitute parts on the same PCB assembly?

A: Yes. All substitute parts are electrically and mechanically equivalent. Mixing different manufacturers on the same assembly is acceptable from a functional standpoint. However, procurement and quality control practices may prefer single-source parts per assembly for traceability and consistency.

Q: What is the significance of the ±100ppm/°C temperature coefficient?

A: This specification indicates the resistor's resistance value changes by approximately 100 parts per million for each degree Celsius change in operating temperature. All listed parts share this identical specification, ensuring equivalent temperature stability across the -55°C to 155°C operating range.

Q: Are there any dimensional constraints I should consider when substituting?

A: All parts conform to the 1206 package standard. Length variations (0.122" to 0.126") and height variations (0.024" to 0.030") are within standard PCB footprint tolerances. No special considerations are required for component placement or spacing.

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