RC1608F49R9CS Equivalent & Substitute Parts Reference

Part Overview

The RC1608F49R9CS is a 49.9 Ohm ±1% thick film chip resistor manufactured by Samsung Electro-Mechanics, rated at 0.1W (1/10W) in a 0603 (1608 Metric) surface mount package. This component is classified as Active product status with ROHS3 compliance and unlimited moisture sensitivity level (MSL 1). The part is supplied in Tape & Reel packaging format.

Equivalent and substitute parts are necessary when the primary part becomes unavailable due to supply constraints, inventory depletion, or manufacturing discontinuation. Alternative components meeting identical electrical and mechanical specifications ensure design continuity and production scheduling flexibility.

Key Parameters

Parameter	Value
Resistance	49.9 Ohms
Tolerance	±1%
Power Rating	0.1W (1/10W)
Composition	Thick Film
Package / Case	0603 (1608 Metric)
Temperature Coefficient	±100ppm/°C
Operating Temperature Range	-55°C ~ 155°C
Moisture Resistant	Yes
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)
Number of Terminations	2

Substitute Part Grouping Explanation

Substitution eligibility for the RC1608F49R9CS is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

Resistance value: 49.9 Ohms
Tolerance: ±1%
Power rating: 0.1W (1/10W)
Package: 0603 (1608 Metric)
Composition: Thick Film
Temperature coefficient: ±100ppm/°C
Operating temperature range: -55°C ~ 155°C
Termination count: 2

Compliance Requirements:

ROHS3 Compliant status
Moisture Sensitivity Level: 1 (Unlimited)

Substitute parts are categorized into two groups:

Direct Substitutes meet all mandatory parameters and compliance requirements with identical packaging format (Tape & Reel).

Similar Substitutes meet all mandatory electrical and mechanical parameters but may include enhanced features (automotive AEC-Q200 certification, anti-sulfur treatment) or alternative packaging formats (Cut Tape & Digi-Reel). These parts are electrically and mechanically interchangeable but offer additional performance characteristics or supply chain options.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Resistance	Tolerance	Power (W)	Package	Temp Coeff	Op Temp Range	Composition	RoHS Status	MSL	Packaging Format	Product Status
RC1608F49R9CS	Samsung Electro-Mechanics	49.9 Ω	±1%	0.1	0603	±100ppm/°C	-55~155°C	Thick Film	ROHS3	1	Tape & Reel	Active
CR0603-FX-49R9ELF	Bourns Inc.	49.9 Ω	±1%	0.1	0603	±100ppm/°C	-55~155°C	Thick Film	ROHS3	1	Tape & Reel	Active
RC0603FR-0749R9L	YAGEO	49.9 Ω	±1%	0.1	0603	±100ppm/°C	-55~155°C	Thick Film	ROHS3	1	Cut Tape & Digi-Reel	Active
AC0603FR-0749R9L	YAGEO	49.9 Ω	±1%	0.1	0603	±100ppm/°C	-55~155°C	Thick Film	ROHS3	1	Tape & Reel	Active
AF0603FR-0749R9L	YAGEO	49.9 Ω	±1%	0.1	0603	±100ppm/°C	-55~155°C	Thick Film	ROHS3	1	Tape & Reel	Active
CRCW060349R9FKEA	Vishay Dale	49.9 Ω	±1%	0.1	0603	±100ppm/°C	-55~155°C	Thick Film	ROHS3	1	Cut Tape & Digi-Reel	Active
CRCW060349R9FKEB	Vishay Dale	49.9 Ω	±1%	0.1	0603	±100ppm/°C	-55~155°C	Thick Film	ROHS3	1	Tape & Reel	Discontinued
CRCW060349R9FKEC	Vishay Dale	49.9 Ω	±1%	0.1	0603	±100ppm/°C	-55~155°C	Thick Film	ROHS3	1	Tape & Reel	Active
CRCW060349R9FKTA	Vishay Dale	49.9 Ω	±1%	0.1	0603	±100ppm/°C	-55~155°C	Thick Film	RoHS non-compliant	1	Cut Tape & Digi-Reel	Active
ERJ-3EKF49R9V	Panasonic Electronic Components	49.9 Ω	±1%	0.1	0603	±100ppm/°C	-55~155°C	Thick Film	ROHS3	1	Cut Tape & Digi-Reel	Active
RCA060349R9FKEA	Vishay Dale	49.9 Ω	±1%	0.1	0603	±100ppm/°C	-55~155°C	Thick Film	ROHS3	1	Tape & Reel	Active

Engineering Selection Recommendations

Primary Direct Substitute: CR0603-FX-49R9ELF (Bourns Inc.) is the recommended direct substitute. This part maintains identical electrical specifications, ROHS3 compliance, and Tape & Reel packaging. Current inventory of 253,003 units ensures supply availability.

Active Status Substitutes with Tape & Reel Packaging:

AC0603FR-0749R9L (YAGEO) – Active status, includes AEC-Q200 automotive certification
CRCW060349R9FKEC (Vishay Dale) – Active status, includes AEC-Q200 automotive certification
RCA060349R9FKEA (Vishay Dale) – Active status, includes AEC-Q200 automotive certification and anti-sulfur treatment

Alternative Packaging Options (Active Status):

RC0603FR-0749R9L (YAGEO) – Cut Tape & Digi-Reel format, 20,377 units in stock
CRCW060349R9FKEA (Vishay Dale) – Cut Tape & Digi-Reel format, 10,300 units in stock
ERJ-3EKF49R9V (Panasonic) – Cut Tape & Digi-Reel format, includes AEC-Q200 certification

Parts to Avoid:

CRCW060349R9FKEB – Discontinued at DiGi Electronics
CRCW060349R9FKTA – RoHS non-compliant status and REACH Affected designation

Frequently Asked Questions (FAQ)

Q: Can I substitute RC1608F49R9CS with CR0603-FX-49R9ELF in my design?

A: Yes. CR0603-FX-49R9ELF meets all mandatory electrical and mechanical parameters: 49.9 Ohm resistance, ±1% tolerance, 0.1W power rating, 0603 package, ±100ppm/°C temperature coefficient, -55°C to 155°C operating range, ROHS3 compliance, and MSL 1 rating. Both use Tape & Reel packaging.

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 performance validation for automotive applications. Parts without this certification (such as RC1608F49R9CS) are suitable for general industrial and consumer applications. Parts with AEC-Q200 (AC0603FR-0749R9L, CRCW060349R9FKEC, ERJ-3EKF49R9V, RCA060349R9FKEA) are qualified for automotive use but remain electrically and mechanically compatible with non-automotive designs.

Q: Why do some substitutes have different physical dimensions?

A: While all parts conform to the 0603 (1608 Metric) package classification, manufacturers may have slight dimensional variations within tolerance. CRCW series parts show 0.061" L x 0.033" W (1.55mm x 0.85mm) versus the standard 0.063" L x 0.031" W (1.60mm x 0.80mm). These variations remain within PCB footprint tolerances and do not affect electrical performance or mechanical fit in standard 0603 land patterns.

Q: What is the significance of MSL 1 (Unlimited) rating?

A: MSL 1 indicates unlimited shelf life without moisture baking requirements. These components do not require pre-reflow baking and can be stored indefinitely under normal conditions, simplifying inventory management and reducing manufacturing process complexity.

Q: Can I use CRCW060349R9FKTA as a substitute?

A: CRCW060349R9FKTA is not recommended. Although electrically and mechanically equivalent, this part carries RoHS non-compliant status and REACH Affected designation, which conflicts with the ROHS3 compliance requirement of the primary part. Use only ROHS3-compliant alternatives.

Q: What packaging format should I select for my application?

A: Tape & Reel packaging is standard for high-volume automated assembly. Cut Tape & Digi-Reel format is suitable for lower-volume production or manual assembly operations. All listed substitutes in either format maintain identical electrical performance. Selection depends on your manufacturing process and volume requirements.

Q: Are anti-sulfur variants (AF0603FR-0749R9L, RCA060349R9FKEA) necessary for my application?

A: Anti-sulfur treatment is beneficial in environments with high sulfur contamination risk, such as industrial or coastal locations. For standard indoor applications, standard moisture-resistant variants are sufficient. Both types are electrically and mechanically interchangeable.

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