MCR03EZPFX4991 Equivalent & Substitute Parts

Part Overview

The MCR03EZPFX4991 is a 4.99 kOhms ±1% 0.1W thick film chip resistor in 0603 (1608 Metric) package manufactured by Rohm Semiconductor. This component is rated for automotive applications under AEC-Q200 standard with an operating temperature range of -55°C to 155°C. The part is currently discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components that maintain electrical and mechanical compatibility for ongoing production and repair applications.

Key Parameters

Parameter	Value
Resistance	4.99 kOhms
Tolerance	±1%
Power Rating	0.1W (1/10W)
Package	0603 (1608 Metric)
Composition	Thick Film
Temperature Coefficient	±100ppm/°C
Operating Temperature	-55°C to 155°C
Automotive Rating	AEC-Q200
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts are classified into three categories based on electrical and mechanical parameter alignment with the MCR03EZPFX4991:

Direct Substitutes maintain identical electrical specifications (4.99 kOhms, ±1% tolerance, 0.1W power rating, ±100ppm/°C temperature coefficient) and package format (0603). These parts are interchangeable without circuit redesign:

CRCW06034K99FKEA (Vishay Dale, Active)
CRCW06034K99FKEB (Vishay Dale, Discontinued)
CRCW06034K99FKEC (Vishay Dale, Active)
RCG06034K99FKEA (Vishay Dale, Active)
RMCF0603FT4K99 (Stackpole Electronics, Active)

Upgrade Substitute provides enhanced tolerance specification while maintaining all other electrical and mechanical parameters:

CRCW06034K99DHEAP (Vishay Dale, ±0.5% tolerance, ±50ppm/°C temperature coefficient, Active)

Similar Substitutes match all critical electrical parameters and package format but differ in specific features or certifications:

CR0603-FX-4991ELF (Bourns Inc., Moisture Resistant feature)
CRG0603F4K99 (TE Connectivity, Neohm series)
RC0603FR-074K99L (YAGEO, Moisture Resistant feature)
RC1608F4991CS (Samsung Electro-Mechanics, Moisture Resistant feature)

Parameter Comparison

Manufacturer Part Number	Manufacturer	Resistance	Tolerance	Power (W)	Temp Coeff (ppm/°C)	Package	AEC-Q200	Product Status	Inventory
MCR03EZPFX4991	Rohm Semiconductor	4.99 kΩ	±1%	0.1	±100	0603	Yes	Discontinued	4,840
CRCW06034K99FKEA	Vishay Dale	4.99 kΩ	±1%	0.1	±100	0603	Yes	Active	5,100
CRCW06034K99FKEB	Vishay Dale	4.99 kΩ	±1%	0.1	±100	0603	Yes	Discontinued	19,563
CRCW06034K99FKEC	Vishay Dale	4.99 kΩ	±1%	0.1	±100	0603	Yes	Active	21,101
RCG06034K99FKEA	Vishay Dale	4.99 kΩ	±1%	0.1	±100	0603	No	Active	25,742
RMCF0603FT4K99	Stackpole Electronics	4.99 kΩ	±1%	0.1	±100	0603	Yes	Active	547,009
CRCW06034K99DHEAP	Vishay Dale	4.99 kΩ	±0.5%	0.1	±50	0603	Yes	Active	20,691
CR0603-FX-4991ELF	Bourns Inc.	4.99 kΩ	±1%	0.1	±100	0603	No	Active	168,950
CRG0603F4K99	TE Connectivity	4.99 kΩ	±1%	0.1	±100	0603	No	Active	20,765
RC0603FR-074K99L	YAGEO	4.99 kΩ	±1%	0.1	±100	0603	No	Active	2,510,304
RC1608F4991CS	Samsung Electro-Mechanics	4.99 kΩ	±1%	0.1	±100	0603	No	Active	49,299

Engineering Selection Recommendations

For Automotive AEC-Q200 Applications: Select from direct substitutes with active product status: CRCW06034K99FKEA, CRCW06034K99FKEC, or RMCF0603FT4K99. All three maintain AEC-Q200 certification and ±1% tolerance specification. RMCF0603FT4K99 offers the highest inventory availability (547,009 units).

For Enhanced Tolerance Requirements: CRCW06034K99DHEAP provides ±0.5% tolerance with ±50ppm/°C temperature coefficient while maintaining AEC-Q200 certification and active product status. This upgrade substitute is suitable for applications requiring tighter resistance tolerance.

For Non-Automotive Applications: Similar substitutes (CR0603-FX-4991ELF, CRG0603F4K99, RC0603FR-074K99L, RC1608F4991CS) are electrically equivalent but lack AEC-Q200 certification. These are appropriate only for non-automotive circuits. RC0603FR-074K99L offers exceptional inventory depth (2,510,304 units) for high-volume requirements.

Packaging Consideration: All substitute parts are available in 0603 (1608 Metric) package. Verify specific packaging format (Cut Tape, Tape & Reel, or Digi-Reel) required for your assembly process before final selection.

Frequently Asked Questions (FAQ)

Q: Can CRCW06034K99FKEA directly replace MCR03EZPFX4991 in automotive circuits? A: Yes. CRCW06034K99FKEA is a direct substitute with identical electrical specifications (4.99 kΩ, ±1%, 0.1W) and AEC-Q200 automotive certification. No circuit redesign is required.

Q: What is the difference between CRCW06034K99FKEA and CRCW06034K99FKEC? A: Both are Vishay Dale direct substitutes with identical electrical parameters and AEC-Q200 certification. The primary difference is packaging format: FKEA is available in Cut Tape & Digi-Reel, while FKEC is Tape & Reel. FKEC has higher inventory (21,101 vs. 5,100 units).

Q: Is CRCW06034K99DHEAP suitable as a replacement? A: CRCW06034K99DHEAP is an upgrade substitute with tighter tolerance (±0.5% vs. ±1%) and lower temperature coefficient (±50ppm/°C vs. ±100ppm/°C). It maintains AEC-Q200 certification and 0603 package. Use only if your circuit design permits the enhanced specifications.

Q: Can I use RC0603FR-074K99L in automotive applications? A: No. RC0603FR-074K99L lacks AEC-Q200 certification. It is suitable only for non-automotive circuits. For automotive applications, select from AEC-Q200 certified alternatives: CRCW06034K99FKEA, CRCW06034K99FKEC, RMCF0603FT4K99, or CRCW06034K99DHEAP.

Q: What does "Moisture Resistant" feature mean for CR0603-FX-4991ELF and RC0603FR-074K99L? A: Moisture Resistant indicates enhanced protection against moisture ingress during storage and assembly. This feature does not affect electrical performance but may provide additional reliability in humid environments. Both parts maintain identical electrical specifications to the original MCR03EZPFX4991.

Q: Why does RMCF0603FT4K99 have significantly higher inventory? A: RMCF0603FT4K99 is a widely used standard component in automotive applications. The high inventory (547,009 units) reflects its broad market adoption and active production status, making it readily available for immediate procurement.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All listed substitute parts are ROHS3 compliant and REACH unaffected, matching the environmental compliance of the original MCR03EZPFX4991.

Q: Can I mix different substitute part manufacturers in the same circuit board? A: Yes. All substitute parts meet identical electrical specifications (4.99 kΩ, ±1%, 0.1W, 0603 package) and are mechanically interchangeable. Mixing manufacturers is acceptable from an electrical and mechanical standpoint.

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