MCR03EZPFX1240 Equivalent & Substitute Parts

Part Overview

The MCR03EZPFX1240 is a 124 Ohms ±1% 0.1W chip resistor in 0603 (1608 Metric) package manufactured by Rohm Semiconductor. This automotive-grade thick film resistor meets AEC-Q200 qualification standards and operates across -55°C to 155°C. The part is currently discontinued at DiGi Electronics, making equivalent substitutes necessary for ongoing production and maintenance applications.

Key Parameters

Parameter	Value
Resistance	124 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 ~ 155°C
Automotive Rating	AEC-Q200
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence across the following parameters: resistance value (124 Ohms), tolerance (±1%), power rating (0.1W), package type (0603), composition (thick film), temperature coefficient (±100ppm/°C), operating temperature range (-55°C to 155°C), and RoHS3 compliance. All substitute parts listed meet these core electrical and mechanical specifications. Automotive AEC-Q200 certification is present in the main part and most substitutes, indicating suitability for automotive applications. Parts are grouped by direct manufacturer equivalence or functional similarity based on identical electrical parameters and package compatibility.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Resistance	Tolerance	Power (W)	Package	Temp Coeff	Op Temp Range	AEC-Q200	Product Status	Composition
MCR03EZPFX1240	Rohm Semiconductor	124 Ω	±1%	0.1	0603	±100ppm/°C	-55°C ~ 155°C	Yes	Discontinued	Thick Film
MCR03ERTF1240	Rohm Semiconductor	124 Ω	±1%	0.1	0603	±100ppm/°C	-55°C ~ 155°C	No	Discontinued	Thick Film
TRR03EZPF1240	Rohm Semiconductor	124 Ω	±1%	0.1	0603	±100ppm/°C	-55°C ~ 155°C	No	Obsolete	Thick Film
CRCW0603124RFKEA	Vishay Dale	124 Ω	±1%	0.1	0603	±100ppm/°C	-55°C ~ 155°C	Yes	Active	Thick Film
ERJ-3EKF1240V	Panasonic Electronic Components	124 Ω	±1%	0.1	0603	±100ppm/°C	-55°C ~ 155°C	Yes	Active	Thick Film
RMCF0603FG124R	Stackpole Electronics Inc	124 Ω	±1%	0.1	0603	±100ppm/°C	-55°C ~ 155°C	Yes	Active	Thick Film
RMCF0603FT124R	Stackpole Electronics Inc	124 Ω	±1%	0.1	0603	±100ppm/°C	-55°C ~ 155°C	Yes	Active	Thick Film
CR0603-FX-1240ELF	Bourns Inc.	124 Ω	±1%	0.1	0603	±100ppm/°C	-55°C ~ 155°C	No	Active	Thick Film

Engineering Selection Recommendations

For applications requiring automotive AEC-Q200 compliance, select from CRCW0603124RFKEA (Vishay Dale), ERJ-3EKF1240V (Panasonic), RMCF0603FG124R, or RMCF0603FT124R (Stackpole Electronics). All four parts are currently active in production and carry AEC-Q200 certification matching the original MCR03EZPFX1240 specification.

For non-automotive applications where AEC-Q200 is not required, MCR03ERTF1240 (Rohm Semiconductor) and CR0603-FX-1240ELF (Bourns) provide functional equivalence. MCR03ERTF1240 maintains Rohm manufacturer continuity but is discontinued. CR0603-FX-1240ELF is active and offers moisture-resistant thick film construction.

TRR03EZPF1240 (Rohm Semiconductor) is obsolete and should be avoided for new designs despite meeting electrical specifications.

All substitute parts are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, matching the original part's environmental qualifications.

Frequently Asked Questions (FAQ)

Q: Can MCR03ERTF1240 replace MCR03EZPFX1240 in automotive applications?

A: MCR03ERTF1240 matches all electrical parameters and package specifications but lacks AEC-Q200 automotive certification. Use only in non-automotive circuits or where automotive qualification is not required.

Q: What is the difference between RMCF0603FG124R and RMCF0603FT124R?

A: Both parts are electrically and mechanically identical with 124 Ohms ±1%, 0.1W, 0603 package, and AEC-Q200 certification. The difference lies in packaging format (FG vs FT designation). Both are active and suitable for direct substitution.

Q: Is CR0603-FX-1240ELF suitable for automotive designs?

A: CR0603-FX-1240ELF does not carry AEC-Q200 certification. It is suitable for consumer and industrial applications but should not be used in automotive circuits requiring AEC-Q200 compliance.

Q: Are all substitute parts available in the same packaging options?

A: Packaging formats vary. MCR03EZPFX1240 is available in standard packaging. MCR03ERTF1240 is available in Cut Tape and Digi-Reel. Most substitutes (TRR03EZPF1240, CRCW0603124RFKEA, ERJ-3EKF1240V, RMCF0603FG124R, RMCF0603FT124R, CR0603-FX-1240ELF) are available in Tape & Reel format. Verify packaging availability with your supplier for production requirements.

Q: Can I use TRR03EZPF1240 as a substitute?

A: TRR03EZPF1240 meets all electrical and mechanical specifications but is obsolete. Avoid for new designs. Use active alternatives such as CRCW0603124RFKEA, ERJ-3EKF1240V, RMCF0603FG124R, or RMCF0603FT124R.

Q: Do all substitutes have the same physical dimensions?

A: All parts use 0603 (1608 Metric) package. Dimensional variations exist: MCR03EZPFX1240, TRR03EZPF1240, ERJ-3EKF1240V, and CR0603-FX-1240ELF measure 0.063" L × 0.031" W (1.60mm × 0.80mm). CRCW0603124RFKEA, RMCF0603FG124R, and RMCF0603FT124R measure 0.061" L × 0.031" W (1.55mm × 0.80mm). Height differences are minimal (0.020" to 0.022"). Verify PCB layout compatibility for tight spacing applications.

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