RC1608F2490CS Equivalent & Substitute Parts Reference

Part Overview

The RC1608F2490CS is a 249 Ohm ±1% thick film chip resistor manufactured by Samsung Electro-Mechanics in 0603 (1608 Metric) package format with 0.1W power rating. This component is classified as Active product status with moisture resistant construction and unlimited moisture sensitivity level (MSL 1). The part is ROHS3 compliant and suitable for general industrial applications requiring standard tolerance resistive elements.

Substitute parts are necessary when the primary manufacturer part becomes unavailable, when supply chain optimization requires alternative sourcing, or when design requirements specify automotive-grade components with AEC-Q200 certification.

Key Parameters

Parameter	Value	Criticality for Substitution
Resistance Value	249 Ohms	Critical - Must Match Exactly
Tolerance	±1%	Critical - Must Match Exactly
Power Rating	0.1W (1/10W)	Critical - Must Match or Exceed
Package / Case	0603 (1608 Metric)	Critical - Must Match Exactly
Composition	Thick Film	Critical - Determines Performance Characteristics
Temperature Coefficient	±100ppm/°C	Critical - Must Match Exactly
Operating Temperature Range	-55°C ~ 155°C	Critical - Must Match or Exceed
Number of Terminations	2	Critical - Standard for Chip Resistors
RoHS Status	ROHS3 Compliant	Application-Dependent
Moisture Sensitivity Level	MSL 1 (Unlimited)	Application-Dependent

Substitute Part Grouping Explanation

Substitution logic for the RC1608F2490CS is based on strict electrical and mechanical parameter matching. All substitute parts must satisfy the following mandatory criteria:

Mandatory Matching Parameters:

Resistance value: 249 Ohms (exact match)
Tolerance: ±1% (exact match)
Power rating: 0.1W minimum (equal or higher acceptable)
Package: 0603 (1608 Metric) (exact match)
Composition: Thick Film (exact match)
Temperature coefficient: ±100ppm/°C (exact match)
Operating temperature range: -55°C to 155°C minimum (equal or wider acceptable)
Terminations: 2 (exact match)

Compliance Considerations: Substitute parts are grouped into two categories based on regulatory compliance:

Standard Industrial Grade - ROHS3 compliant, MSL 1, REACH unaffected
Automotive Grade - ROHS3 compliant with AEC-Q200 certification, or non-compliant variants for legacy applications

All identified substitute parts meet the mandatory electrical and mechanical parameters. Compliance differences are noted for design requirement alignment.

Parameter Comparison

Part Number	Manufacturer	Resistance	Tolerance	Power	Package	Temp Coeff	Op Temp Range	Composition	RoHS Status	AEC-Q200	Product Status
RC1608F2490CS	Samsung Electro-Mechanics	249 Ω	±1%	0.1W	0603	±100ppm/°C	-55°C ~ 155°C	Thick Film	ROHS3	No	Active
CR0603-FX-2490ELF	Bourns Inc.	249 Ω	±1%	0.1W	0603	±100ppm/°C	-55°C ~ 155°C	Thick Film	ROHS3	No	Active
AC0603FR-07249RL	YAGEO	249 Ω	±1%	0.1W	0603	±100ppm/°C	-55°C ~ 155°C	Thick Film	ROHS3	Yes	Active
CRCW0603249RFKEA	Vishay Dale	249 Ω	±1%	0.1W	0603	±100ppm/°C	-55°C ~ 155°C	Thick Film	ROHS3	Yes	Active
CRCW0603249RFKEB	Vishay Dale	249 Ω	±1%	0.1W	0603	±100ppm/°C	-55°C ~ 155°C	Thick Film	ROHS3	Yes	Discontinued at DiGi Electronics
CRCW0603249RFKTA	Vishay Dale	249 Ω	±1%	0.1W	0603	±100ppm/°C	-55°C ~ 155°C	Thick Film	Non-Compliant	Yes	Active
ERJ-3EKF2490V	Panasonic Electronic Components	249 Ω	±1%	0.1W	0603	±100ppm/°C	-55°C ~ 155°C	Thick Film	ROHS3	Yes	Active
RMCF0603FT249R	Stackpole Electronics Inc	249 Ω	±1%	0.1W	0603	±100ppm/°C	-55°C ~ 155°C	Thick Film	ROHS3	Yes	Active

Engineering Selection Recommendations

For Standard Industrial Applications (Non-Automotive):

CR0603-FX-2490ELF (Bourns Inc.) serves as the primary direct substitute for RC1608F2490CS. Both parts share identical electrical specifications, package format, and ROHS3 compliance without automotive certification. This substitution is appropriate when AEC-Q200 qualification is not required and standard industrial reliability is sufficient.

For Automotive and High-Reliability Applications:

AC0603FR-07249RL (YAGEO), CRCW0603249RFKEA (Vishay Dale), ERJ-3EKF2490V (Panasonic), and RMCF0603FT249R (Stackpole) are qualified alternatives with AEC-Q200 certification. These parts meet automotive industry standards and are suitable for applications requiring enhanced reliability documentation and traceability. All four maintain ROHS3 compliance and active product status.

Availability and Supply Chain Considerations:

RMCF0603FT249R (Stackpole) and ERJ-3EKF2490V (Panasonic) demonstrate highest inventory levels (54,292 and 118,109 units respectively), providing supply chain stability. CRCW0603249RFKEB (Vishay Dale) is marked as discontinued at DiGi Electronics and should be avoided for new designs requiring long-term availability.

Regulatory Compliance:

CRCW0603249RFKTA (Vishay Dale) is RoHS non-compliant and REACH affected. This part is suitable only for legacy applications or markets where RoHS3 compliance is not mandated. New designs should not incorporate this variant.

Frequently Asked Questions (FAQ)

Q: Can I substitute RC1608F2490CS with any 249 Ohm 1% resistor in 0603 package?

A: No. Substitution requires exact matching of all critical parameters: 249 Ohm resistance, ±1% tolerance, 0.1W power rating, ±100ppm/°C temperature coefficient, thick film composition, and -55°C to 155°C operating range. Package format alone is insufficient for compatibility determination.

Q: What is the difference between standard industrial and automotive-grade substitutes?

A: Automotive-grade substitutes (AC0603FR-07249RL, CRCW0603249RFKEA, ERJ-3EKF2490V, RMCF0603FT249R) carry AEC-Q200 certification, indicating compliance with automotive industry reliability and qualification standards. Standard industrial substitutes (CR0603-FX-2490ELF) do not carry this certification. Selection depends on application requirements, not performance differences in standard operating conditions.

Q: Are there physical dimension differences between substitute parts?

A: Minor variations exist within 0603 package specification. Most substitutes measure 0.063" L x 0.031" W (1.60mm x 0.80mm) with 0.022" maximum seated height. CRCW variants measure 0.063" L x 0.033" W (1.60mm x 0.85mm) with 0.020" maximum seated height, and RMCF0603FT249R measures 0.061" L x 0.031" W (1.55mm x 0.80mm). These variations remain within 0603 package tolerance and do not affect PCB layout compatibility.

Q: Why is CRCW0603249RFKTA listed if it is RoHS non-compliant?

A: CRCW0603249RFKTA is included for reference in applications where RoHS compliance is not required or for legacy system maintenance. New designs should not specify this part. REACH-affected status indicates additional regulatory documentation requirements for certain markets.

Q: Which substitute offers the best supply chain stability?

A: ERJ-3EKF2490V (Panasonic) with 118,109 units in stock provides the highest inventory level, followed by CRCW0603249RFKEA (Vishay Dale) with 96,194 units. Both parts are active status with AEC-Q200 certification, making them suitable for designs requiring long-term component availability and automotive qualification.

Q: Can I use a higher power rating substitute?

A: Yes. Substitutes with equal or higher power ratings are acceptable. All identified substitutes match the 0.1W specification exactly. If future design revisions require higher power dissipation, 0603 package format limits practical options to 0.1W or 0.125W ratings within standard thick film construction.

Q: What packaging formats are available for these substitutes?

A: Tape & Reel (TR) packaging is standard for production quantities. CRCW0603249RFKEA and ERJ-3EKF2490V are available in Cut Tape (CT) & Digi-Reel® format for smaller order quantities. Packaging selection does not affect electrical or mechanical compatibility.

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