RC1608F51R1CS Equivalent & Substitute Parts Reference

Part Overview

The RC1608F51R1CS is a 51.1 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 RoHS3 compliance and unlimited moisture sensitivity level (MSL 1). The part is designed for general-purpose SMD applications requiring precision resistive elements with moisture resistance characteristics. Equivalent and substitute parts are identified based on matching electrical specifications, mechanical dimensions, and environmental ratings to ensure direct functional interchangeability in circuit designs.

Key Parameters

Parameter	Specification
Resistance Value	51.1 Ohms
Tolerance	±1%
Power Rating	0.1W (1/10W)
Package / Case	0603 (1608 Metric)
Composition	Thick Film
Temperature Coefficient	±100ppm/°C
Operating Temperature Range	-55°C to 155°C
Moisture Sensitivity Level	1 (Unlimited)
RoHS Status	RoHS3 Compliant
Number of Terminations	2

Substitute Part Grouping Explanation

Substitution eligibility for the RC1608F51R1CS is determined by strict equivalence across the following critical parameters:

Electrical Parameters: Resistance value (51.1 Ohms), tolerance (±1%), and power rating (0.1W) must match exactly. Temperature coefficient (±100ppm/°C) and operating temperature range (-55°C to 155°C) establish thermal performance boundaries.

Mechanical Parameters: Package designation (0603 / 1608 Metric), composition (Thick Film), and termination count (2) ensure physical and functional compatibility with PCB layouts and assembly processes.

Environmental & Compliance Parameters: Moisture Sensitivity Level 1 (Unlimited), RoHS3 compliance status, and REACH classification determine suitability for regulated applications and long-term storage conditions.

Substitute parts are categorized as Direct Equivalents (matching all parameters including moisture resistance features) or Similar Parts (matching core electrical and mechanical specifications but with additional certifications such as AEC-Q200 automotive qualification).

Parameter Comparison

Manufacturer Part Number	Manufacturer	Resistance	Tolerance	Power (W)	Package	Temp Coeff	Op Temp Range	MSL	RoHS Status	Features	Product Status
RC1608F51R1CS	Samsung Electro-Mechanics	51.1 Ω	±1%	0.1	0603	±100ppm/°C	-55 to 155°C	1	RoHS3	Moisture Resistant	Active
CR0603-FX-51R1ELF	Bourns Inc.	51.1 Ω	±1%	0.1	0603	±100ppm/°C	-55 to 155°C	1	RoHS3	Moisture Resistant	Active
RC0603FR-0751R1L	YAGEO	51.1 Ω	±1%	0.1	0603	±100ppm/°C	-55 to 155°C	1	RoHS3	Moisture Resistant	Active
AC0603FR-0751R1L	YAGEO	51.1 Ω	±1%	0.1	0603	±100ppm/°C	-55 to 155°C	1	RoHS3	Automotive AEC-Q200, Moisture Resistant	Active
CRCW060351R1FKEA	Vishay Dale	51.1 Ω	±1%	0.1	0603	±100ppm/°C	-55 to 155°C	1	RoHS3	Automotive AEC-Q200	Active
CRCW060351R1FKEB	Vishay Dale	51.1 Ω	±1%	0.1	0603	±100ppm/°C	-55 to 155°C	1	RoHS3	Automotive AEC-Q200	Discontinued at DiGi Electronics
CRCW060351R1FKTA	Vishay Dale	51.1 Ω	±1%	0.1	0603	±100ppm/°C	-55 to 155°C	1	RoHS non-compliant	Automotive AEC-Q200	Active
ERJ-3EKF51R1V	Panasonic Electronic Components	51.1 Ω	±1%	0.1	0603	±100ppm/°C	-55 to 155°C	1	RoHS3	Automotive AEC-Q200	Active
RMCF0603FT51R1	Stackpole Electronics Inc	51.1 Ω	±1%	0.1	0603	±100ppm/°C	-55 to 155°C	1	RoHS3	Automotive AEC-Q200	Active

Engineering Selection Recommendations

Direct Equivalents (Preferred for Non-Automotive Applications):

CR0603-FX-51R1ELF (Bourns Inc.) and RC0603FR-0751R1L (YAGEO) provide direct functional equivalence to the RC1608F51R1CS with matching moisture resistance features, RoHS3 compliance, and Active product status. These parts are suitable for general-purpose applications where automotive qualification is not required.

Automotive-Qualified Alternatives (AEC-Q200):

AC0603FR-0751R1L (YAGEO), CRCW060351R1FKEA (Vishay Dale), ERJ-3EKF51R1V (Panasonic Electronic Components), and RMCF0603FT51R1 (Stackpole Electronics Inc) meet all electrical and mechanical specifications with additional AEC-Q200 automotive qualification. These parts are suitable for automotive and high-reliability applications requiring enhanced quality assurance.

Compliance Considerations:

CRCW060351R1FKTA (Vishay Dale) carries RoHS non-compliant and REACH Affected status. This part is functionally equivalent but restricted for use in regulated markets requiring RoHS3 compliance. CRCW060351R1FKEB (Vishay Dale) is discontinued at DiGi Electronics and should not be selected for new designs despite Active status at manufacturer level.

Inventory Availability:

RMCF0603FT51R1 (448,094 pcs) and RC0603FR-0751R1L (224,623 pcs) offer highest stock levels. CR0603-FX-51R1ELF (77,212 pcs) and ERJ-3EKF51R1V (114,776 pcs) provide substantial availability for high-volume procurement.

Frequently Asked Questions (FAQ)

Q: Can CR0603-FX-51R1ELF replace RC1608F51R1CS in any application?

A: CR0603-FX-51R1ELF is a direct equivalent with identical electrical parameters (51.1 Ohms ±1%, 0.1W), mechanical package (0603), thermal characteristics (±100ppm/°C, -55 to 155°C), and compliance status (RoHS3, MSL 1). Direct substitution is valid for all non-automotive applications.

Q: What is the difference between moisture-resistant and AEC-Q200 qualified parts?

A: Moisture resistance is a material property indicating protection against humidity ingress. AEC-Q200 is an automotive qualification standard requiring additional testing for reliability, temperature cycling, and failure rate validation. AEC-Q200 parts (AC0603FR-0751R1L, ERJ-3EKF51R1V, RMCF0603FT51R1, CRCW060351R1FKEA) are suitable for automotive and high-reliability applications; moisture-resistant parts (CR0603-FX-51R1ELF, RC0603FR-0751R1L) are suitable for general-purpose applications.

Q: Why is CRCW060351R1FKTA not recommended despite Active status?

A: CRCW060351R1FKTA carries RoHS non-compliant and REACH Affected designations, restricting use in regulated markets and applications subject to environmental compliance requirements. For new designs, select RoHS3-compliant alternatives.

Q: Are there dimensional differences between substitute parts?

A: Dimensional variations exist within tolerance. RC1608F51R1CS, CR0603-FX-51R1ELF, RC0603FR-0751R1L, and ERJ-3EKF51R1V specify 0.063" L × 0.031" W (1.60mm × 0.80mm). CRCW060351R1FKEA specifies 0.061" L × 0.033" W (1.55mm × 0.85mm). CRCW060351R1FKEB and CRCW060351R1FKTA specify 0.063" L × 0.033" W (1.60mm × 0.85mm). RMCF0603FT51R1 specifies 0.061" L × 0.031" W (1.55mm × 0.80mm). These variations remain within 0603 package classification and do not affect PCB layout compatibility.

Q: Which substitute part offers the best long-term availability?

A: RMCF0603FT51R1 (Stackpole Electronics Inc) with 448,094 pcs in stock and Active product status provides the highest inventory level and supply security for long-term production requirements.

Q: Can automotive-qualified parts be used in non-automotive applications?

A: Yes. AEC-Q200 qualified parts (AC0603FR-0751R1L, ERJ-3EKF51R1V, RMCF0603FT51R1, CRCW060351R1FKEA) meet or exceed specifications for non-automotive applications. Their use in general-purpose circuits introduces no functional or reliability concerns.

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