RC2012F4991CS Equivalent & Substitute Parts Reference

Part Overview

The RC2012F4991CS is a 4.99 kOhms ±1% 0.125W thick film chip resistor manufactured by Samsung Electro-Mechanics in 0805 (2012 Metric) package format. This component is classified as Active product status with moisture resistant characteristics and ROHS3 compliance. The part is supplied in Tape & Reel packaging with 846 units currently in stock inventory.

Equivalent and substitute parts are necessary when the primary part experiences supply constraints, extended lead times, or when design requirements necessitate alternative manufacturer specifications such as automotive AEC-Q200 certification or enhanced environmental protection features.

Key Parameters

Parameter	Value	Specification Basis
Resistance Value	4.99 kOhms	Core electrical specification
Tolerance	±1%	Precision requirement
Power Rating	0.125W (1/8W)	Thermal dissipation capacity
Package / Case	0805 (2012 Metric)	Physical footprint and PCB compatibility
Composition	Thick Film	Manufacturing technology
Temperature Coefficient	±100ppm/°C	Stability over temperature range
Operating Temperature Range	-55°C to 155°C	Environmental operating limits
Terminations	2	Connection points
RoHS Status	ROHS3 Compliant	Environmental regulation compliance
Moisture Sensitivity Level	MSL 1 (Unlimited)	Handling and storage requirements

Substitute Part Grouping Explanation

Substitution eligibility for the RC2012F4991CS is determined by strict electrical and mechanical parameter matching:

Primary Substitution Criteria (Mandatory Match):

Resistance value: 4.99 kOhms
Tolerance: ±1%
Power rating: 0.125W (1/8W)
Package: 0805 (2012 Metric)
Composition: Thick Film
Temperature coefficient: ±100ppm/°C
Operating temperature range: -55°C to 155°C
Number of terminations: 2
RoHS compliance: ROHS3 Compliant
MSL rating: 1 (Unlimited)

Secondary Characteristics (Allowable Variation):

Manufacturer identity
Packaging format (Tape & Reel vs. Cut Tape & Digi-Reel)
Height seated maximum (within 0.020" to 0.028" range)
Additional features (Automotive AEC-Q200, Moisture Resistant, Anti-Sulfur, High Voltage, Pulse Withstanding)

Non-Substitutable Parameters:

Power rating above 0.125W (1/8W) represents functional over-specification
Package sizes other than 0805 (2012 Metric)
Resistance values deviating from 4.99 kOhms
Tolerance specifications wider than ±1%

Parameter Comparison

Manufacturer	Part Number	Resistance	Tolerance	Power	Package	Temp Coeff	Op Temp Range	Height Max	Features	RoHS	MSL
Samsung Electro-Mechanics	RC2012F4991CS	4.99 kΩ	±1%	0.125W	0805	±100ppm/°C	-55°C ~ 155°C	0.026"	Moisture Resistant	ROHS3	1
Bourns Inc.	CR0805-FX-4991ELF	4.99 kΩ	±1%	0.125W	0805	±100ppm/°C	-55°C ~ 155°C	0.024"	Moisture Resistant	ROHS3	1
Panasonic Electronic Components	ERJ-6ENF4991V	4.99 kΩ	±1%	0.125W	0805	±100ppm/°C	-55°C ~ 155°C	0.028"	Automotive AEC-Q200	ROHS3	1
Rohm Semiconductor	KTR10EZPF4991	4.99 kΩ	±1%	0.125W	0805	±100ppm/°C	-55°C ~ 155°C	0.026"	Automotive AEC-Q200, High Voltage	ROHS3	1
YAGEO	RC0805FR-074K99L	4.99 kΩ	±1%	0.125W	0805	±100ppm/°C	-55°C ~ 155°C	0.024"	Moisture Resistant	ROHS3	1
Stackpole Electronics Inc	RMCF0805FT4K99	4.99 kΩ	±1%	0.125W	0805	±100ppm/°C	-55°C ~ 155°C	0.026"	Automotive AEC-Q200	ROHS3	1
YAGEO	AC0805FR-074K99L	4.99 kΩ	±1%	0.125W	0805	±100ppm/°C	-55°C ~ 155°C	0.024"	Automotive AEC-Q200, Moisture Resistant	ROHS3	1
YAGEO	AF0805FR-074K99L	4.99 kΩ	±1%	0.125W	0805	±100ppm/°C	-55°C ~ 155°C	0.024"	Anti-Sulfur, Automotive AEC-Q200	ROHS3	1
Vishay Dale	CRCW08054K99FKEA	4.99 kΩ	±1%	0.125W	0805	±100ppm/°C	-55°C ~ 155°C	0.020"	Automotive AEC-Q200	ROHS3	1
Vishay Dale	CRCW08054K99FKEAC	4.99 kΩ	±1%	0.125W	0805	±100ppm/°C	-55°C ~ 155°C	0.024"	Standard Thick Film	ROHS3	1

Engineering Selection Recommendations

Direct Substitutes (Functionally Equivalent):

The following parts meet all electrical and mechanical specifications of the RC2012F4991CS and are classified as direct substitutes:

CR0805-FX-4991ELF (Bourns Inc.): Identical electrical specifications with moisture resistant composition. Seated height 0.024" provides compact PCB integration. Active product status with full ROHS3 compliance. Inventory availability: 51,047 units.
RC0805FR-074K99L (YAGEO): Moisture resistant thick film composition matching the primary part's environmental protection characteristics. Seated height 0.024". Active product status. Inventory availability: 9,250 units.
CRCW08054K99FKEAC (Vishay Dale): Standard thick film composition without additional certifications. Seated height 0.024". Active product status with ROHS3 compliance. Inventory availability: 186,945 units.

Substitutes with Enhanced Specifications:

The following parts exceed the primary specification with additional certifications or features while maintaining full electrical and mechanical compatibility:

ERJ-6ENF4991V (Panasonic Electronic Components): Automotive AEC-Q200 certified. Seated height 0.028". Cut Tape & Digi-Reel packaging. Active product status. Inventory availability: 79,703 units.
KTR10EZPF4991 (Rohm Semiconductor): Automotive AEC-Q200 certified with high voltage capability. Seated height 0.026". Tape & Reel packaging. Active product status. Inventory availability: 12,471 units.
RMCF0805FT4K99 (Stackpole Electronics Inc): Automotive AEC-Q200 certified. Seated height 0.026". Tape & Reel packaging. Active product status. Inventory availability: 61,132 units.
AC0805FR-074K99L (YAGEO): Automotive AEC-Q200 certified with moisture resistant composition. Seated height 0.024". Tape & Reel packaging. Active product status. Inventory availability: 66,297 units.
AF0805FR-074K99L (YAGEO): Automotive AEC-Q200 certified with anti-sulfur protection and moisture resistant composition. Seated height 0.024". Tape & Reel packaging. Active product status. Inventory availability: 4,201 units.
CRCW08054K99FKEA (Vishay Dale): Automotive AEC-Q200 certified. Seated height 0.020" provides lowest profile option. Tape & Reel packaging. Active product status. Inventory availability: 265,993 units.

Non-Substitutable Part:

CRCW08054K99FKEAHP (Vishay Dale): Power rating 0.5W (1/2W) exceeds the 0.125W specification. This part represents functional over-specification and is not suitable as a direct substitute despite matching all other parameters.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with higher power rating such as CRCW08054K99FKEAHP (0.5W)?

A: No. The CRCW08054K99FKEAHP with 0.5W power rating is not a valid substitute for the RC2012F4991CS specified at 0.125W. While higher power rating does not create electrical incompatibility, it represents functional over-specification that deviates from the design requirement. The original specification of 0.125W must be maintained for circuit validation and thermal design consistency.

Q: What is the difference between Tape & Reel and Cut Tape & Digi-Reel packaging?

A: Both packaging formats contain identical components with the same electrical and mechanical specifications. Tape & Reel (TR) packaging supplies components on continuous carrier tape suitable for automated pick-and-place equipment with reel-based feeding systems. Cut Tape (CT) & Digi-Reel packaging provides components on cut tape segments with optional reel format, offering flexibility for lower-volume assembly operations or mixed component sourcing. Selection depends on assembly equipment capability and production volume requirements.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance status identical to the RC2012F4991CS. This ensures regulatory compliance for applications subject to European Union Restriction of Hazardous Substances directives.

Q: What does Automotive AEC-Q200 certification mean?

A: AEC-Q200 is an automotive electronics council qualification standard for passive components. Parts bearing this certification have undergone enhanced reliability testing and environmental stress screening specific to automotive applications. Components such as ERJ-6ENF4991V, KTR10EZPF4991, RMCF0805FT4K99, AC0805FR-074K99L, AF0805FR-074K99L, and CRCW08054K99FKEA carry this certification and are suitable for automotive circuit designs requiring this qualification level.

Q: Does seated height variation affect PCB compatibility?

A: Seated height variations within the 0.020" to 0.028" range do not affect PCB footprint compatibility for 0805 (2012 Metric) package format. All substitute parts share identical land pattern dimensions of 0.079" L x 0.049" W (2.00mm x 1.25mm). Height differences are negligible for standard PCB assembly processes and do not impact solder joint formation or component placement accuracy.

Q: What is Moisture Sensitivity Level (MSL) 1?

A: MSL 1 designation indicates unlimited shelf life without moisture bake-out requirements. Components with MSL 1 rating can be stored indefinitely at standard warehouse conditions without degradation of solderability or component performance. All listed parts including the RC2012F4991CS carry MSL 1 rating, eliminating special storage or handling protocols.

Q: Can I substitute parts between different manufacturers within the same specification?

A: Yes. All listed substitute parts meet identical electrical specifications (4.99 kOhms ±1%, 0.125W, ±100ppm/°C, -55°C to 155°C operating range) and mechanical requirements (0805 package, 2 terminations). Manufacturer differences do not affect functional performance when specifications are matched. Selection can be based on inventory availability, lead time, cost, or specific feature requirements such as automotive certification or environmental protection.

Q: What does "High Voltage" feature on KTR10EZPF4991 indicate?

A: The high voltage designation on the KTR10EZPF4991 indicates enhanced voltage withstanding capability beyond standard thick film resistor specifications. This feature is provided as additional specification margin and does not affect compatibility with standard 0805 package applications. Selection of this part is appropriate when circuit design includes voltage stress conditions or when design margin enhancement is required.

Q: Is anti-sulfur protection necessary for standard applications?

A: Anti-sulfur protection on the AF0805FR-074K99L is an optional enhancement feature. Standard thick film resistors without anti-sulfur coating perform adequately in typical industrial and commercial environments. Anti-sulfur protection is beneficial in applications exposed to high-sulfur atmospheric conditions, industrial pollution, or specific environmental stress scenarios. For standard applications, this feature is not mandatory.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message