MCR18ERTJ430 Equivalent & Substitute Parts

Part Overview

The MCR18ERTJ430 is a 43 Ohm ±5% 0.25W thick film chip resistor in 1206 (3216 Metric) package manufactured by Rohm Semiconductor. This part is discontinued at DiGi Electronics, making equivalent and substitute parts necessary for ongoing design support and procurement. The resistor operates across -55°C to 155°C with ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1).

Key Parameters

Parameter	Value
Resistance	43 Ohms
Tolerance	±5%
Power Rating	0.25W (1/4W)
Package	1206 (3216 Metric)
Composition	Thick Film
Temperature Coefficient	±200ppm/°C
Operating Temperature Range	-55°C to 155°C
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the MCR18ERTJ430 is determined by strict equivalence in the following parameters: resistance value (43 Ohms), tolerance (±5%), package format (1206), and composition (thick film). Parts are grouped into three categories based on electrical and mechanical compatibility:

Direct Equivalents maintain identical resistance, tolerance, power rating (0.25W), and package specifications. These parts are pin-compatible and functionally interchangeable without circuit modification.

Upgraded Substitutes increase power rating (0.5W or higher) or improve tolerance (±1%) while maintaining the same 1206 package and 43 Ohm resistance. These provide enhanced performance margins and are backward-compatible with the original design.

Similar Alternatives match core electrical parameters (43 Ohms, ±5%, 0.25W, 1206 package) but may originate from different manufacturers with varying certifications or dimensional tolerances within acceptable ranges.

Parameter Comparison

Part Number	Manufacturer	Resistance	Tolerance	Power (W)	Temp Coeff (ppm/°C)	Package	Product Status	AEC-Q200
MCR18ERTJ430	Rohm Semiconductor	43 Ω	±5%	0.25	±200	1206	Discontinued	No
ESR18EZPJ430	Rohm Semiconductor	43 Ω	±5%	0.5	±200	1206	Active	Yes
ERJ-8GEYJ430V	Panasonic Electronic Components	43 Ω	±5%	0.25	±200	1206	Not For New Designs	Yes
RMCF1206JT43R0	Stackpole Electronics Inc	43 Ω	±5%	0.25	±200	1206	Active	Yes
ERJ-8ENF43R0V	Panasonic Electronic Components	43 Ω	±1%	0.25	±100	1206	Not For New Designs	Yes
ERJ-P08J430V	Panasonic Electronic Components	43 Ω	±5%	0.667	±200	1206	Active	Yes
RC1206FR-0743RL	YAGEO	43 Ω	±1%	0.25	±100	1206	Active	No
RC1206JR-0743RL	YAGEO	43 Ω	±5%	0.25	±100	1206	Active	No
CRCW120643R0JNEA	Vishay Dale	43 Ω	±5%	0.25	±200	1206	Active	Yes

Engineering Selection Recommendations

For direct replacement with active product status: RMCF1206JT43R0 (Stackpole Electronics Inc) provides exact electrical and mechanical equivalence with AEC-Q200 automotive qualification and active product status. This part maintains 43 Ohms ±5%, 0.25W power rating, and 1206 package specifications identical to the MCR18ERTJ430.

For enhanced performance with higher power margin: ESR18EZPJ430 (Rohm Semiconductor) doubles the power rating to 0.5W while maintaining ±5% tolerance and AEC-Q200 compliance. This upgrade is suitable for applications requiring additional thermal headroom without circuit redesign.

For improved tolerance specifications: RC1206FR-0743RL (YAGEO) or ERJ-8ENF43R0V (Panasonic) offer ±1% tolerance with reduced temperature coefficient (±100ppm/°C) compared to the original ±200ppm/°C. These parts are appropriate for precision applications where tighter resistance control is required.

For automotive applications: CRCW120643R0JNEA (Vishay Dale) and ERJ-P08J430V (Panasonic) both carry AEC-Q200 certification with active product status, ensuring compliance with automotive reliability standards.

Frequently Asked Questions (FAQ)

Q: Can I use a higher power-rated resistor as a substitute? A: Yes. Parts rated at 0.5W (ESR18EZPJ430) or 0.667W (ERJ-P08J430V) are backward-compatible with designs requiring 0.25W. The higher power rating provides additional thermal margin without affecting circuit function, provided the 1206 package and 43 Ohm resistance remain unchanged.

Q: What is the difference between ±5% and ±1% tolerance parts? A: Tolerance specifies the maximum deviation from the nominal 43 Ohm value. ±5% allows ±2.15 Ohms variation; ±1% allows ±0.43 Ohms variation. Use ±1% parts (RC1206FR-0743RL, ERJ-8ENF43R0V) only if circuit performance requires tighter resistance control.

Q: Are all substitute parts in the same 1206 package? A: Yes. All listed substitutes use the 1206 (3216 Metric) package format, ensuring identical PCB footprint compatibility. Dimensional variations within the 1206 specification (length 0.120–0.126", width 0.061–0.063", height 0.024–0.028") are within standard manufacturing tolerances.

Q: What does "Not For New Designs" product status mean? A: This designation indicates the manufacturer is phasing out the part but maintains supply for existing designs. ERJ-8GEYJ430V and ERJ-8ENF43R0V carry this status. For new designs, prioritize parts with "Active" status such as RMCF1206JT43R0 or RC1206JR-0743RL.

Q: Do I need AEC-Q200 certification for my application? A: AEC-Q200 certification is required only for automotive applications. If your design targets automotive markets, select from ESR18EZPJ430, ERJ-8GEYJ430V, RMCF1206JT43R0, ERJ-8ENF43R0V, ERJ-P08J430V, or CRCW120643R0JNEA. For non-automotive applications, RC1206FR-0743RL and RC1206JR-0743RL are suitable alternatives.

Q: What is the temperature coefficient and why does it matter? A: Temperature coefficient (±100ppm/°C or ±200ppm/°C) indicates how resistance changes with temperature. Lower values (±100ppm/°C) provide better stability across the -55°C to 155°C operating range. Select ±100ppm/°C parts for precision applications; ±200ppm/°C parts are acceptable for general-purpose circuits.

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