MCR03ERTJ1R2 Equivalent & Substitute Parts

Part Overview

The MCR03ERTJ1R2 is a 1.2 Ohm ±5% thick film chip resistor in 0603 (1608 Metric) package rated for 0.1W power dissipation. This Rohm Semiconductor component is discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives from active manufacturers. Substitute parts maintain the same resistance value, package footprint, and power rating while offering improved tolerance specifications and automotive-grade certifications in many cases.

Key Parameters

Parameter	MCR03ERTJ1R2
Resistance	1.2 Ohms
Tolerance	±5%
Power Rating	0.1W (1/10W)
Package	0603 (1608 Metric)
Composition	Thick Film
Operating Temperature	-55°C to 155°C
Temperature Coefficient	±400ppm/°C
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	MSL 1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility is determined by three critical parameters: resistance value, package footprint, and power rating. All identified substitutes maintain 1.2 Ohm resistance, 0603 package compatibility, and 0.1W power dissipation. Tolerance specifications vary between ±5% and ±1%, with tighter tolerance parts offering direct substitution for applications requiring improved accuracy. Temperature coefficient ranges from ±200ppm/°C to ±400ppm/°C. Automotive AEC-Q200 certification is present in four of five substitute options, indicating suitability for automotive applications. All parts maintain ROHS3 compliance and MSL 1 rating, ensuring compatibility with standard PCB assembly processes.

Parameter Comparison

Part Number	Manufacturer	Resistance	Tolerance	Power Rating	Package	Temp Coeff	Operating Temp	AEC-Q200	Status
MCR03ERTJ1R2	Rohm Semiconductor	1.2 Ω	±5%	0.1W	0603	±400ppm/°C	-55 to 155°C	No	Discontinued
KTR03EZPF1R20	Rohm Semiconductor	1.2 Ω	±1%	0.1W	0603	±200ppm/°C	-55 to 155°C	Yes	Active
ERJ-3RQF1R2V	Panasonic Electronic Components	1.2 Ω	±1%	0.1W	0603	±200ppm/°C	-55 to 155°C	Yes	Active
RC0603JR-071R2L	YAGEO	1.2 Ω	±5%	0.1W	0603	±200ppm/°C	-55 to 155°C	No	Active
RMCF0603FT1R20	Stackpole Electronics Inc	1.2 Ω	±1%	0.1W	0603	±200ppm/°C	-55 to 155°C	Yes	Active
RMCF0603JT1R20	Stackpole Electronics Inc	1.2 Ω	±5%	0.1W	0603	±200ppm/°C	-55 to 155°C	Yes	Active

Engineering Selection Recommendations

For direct replacement with identical tolerance specifications, RC0603JR-071R2L from YAGEO provides ±5% tolerance matching the original MCR03ERTJ1R2 while maintaining active product status and standard industrial compliance.

For applications requiring improved tolerance and automotive qualification, three options are available: KTR03EZPF1R20 (Rohm Semiconductor), ERJ-3RQF1R2V (Panasonic Electronic Components), and RMCF0603FT1R20 (Stackpole Electronics Inc). All three offer ±1% tolerance, AEC-Q200 certification, and ±200ppm/°C temperature coefficient with active product status.

RMCF0603JT1R20 from Stackpole Electronics Inc combines ±5% tolerance matching with AEC-Q200 automotive certification and active availability, suitable for applications requiring automotive-grade components without tolerance upgrade.

All substitute parts maintain identical 0603 package footprint, 0.1W power rating, and ROHS3 compliance, ensuring PCB layout compatibility and regulatory conformance.

Frequently Asked Questions (FAQ)

Q: Can MCR03ERTJ1R2 be replaced with any of these substitutes in existing designs?

A: Yes. All substitute parts maintain identical resistance value (1.2 Ohm), package footprint (0603), power rating (0.1W), and operating temperature range (-55°C to 155°C). Direct PCB footprint compatibility is assured.

Q: What is the difference between ±5% and ±1% tolerance options?

A: Tolerance defines the maximum deviation from the nominal 1.2 Ohm resistance value. ±5% tolerance allows deviation up to ±0.06 Ohm, while ±1% tolerance restricts deviation to ±0.012 Ohm. Applications requiring tighter resistance accuracy should specify ±1% parts.

Q: Why do some substitutes have AEC-Q200 certification?

A: AEC-Q200 is an automotive industry qualification standard. Parts bearing this certification have undergone additional reliability testing for automotive applications. Non-automotive applications do not require this certification.

Q: Are there packaging differences between substitutes?

A: The original MCR03ERTJ1R2 is supplied in Cut Tape (CT) packaging. All substitute parts are supplied in Tape & Reel (TR) packaging, which is standard for high-volume manufacturing. Physical component dimensions remain identical at 0603 package size.

Q: What is the significance of temperature coefficient differences?

A: Temperature coefficient indicates resistance change per degree Celsius. The original part specifies ±400ppm/°C, while most substitutes offer ±200ppm/°C, representing improved stability across temperature extremes. For applications with wide temperature operation, lower temperature coefficient values provide better performance consistency.

Q: Can I use a ±1% tolerance part as a direct replacement for a ±5% specification?

A: Yes. A ±1% tolerance part is a superior specification that meets or exceeds ±5% tolerance requirements. This represents an upgrade path for designs where improved accuracy is beneficial.

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