MCR18ERTJ621 Equivalent & Substitute Parts

Part Overview

The MCR18ERTJ621 is a 620 Ohms ±5% 0.25W thick film chip resistor in 1206 (3216 Metric) package manufactured by Rohm Semiconductor. This part is discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components for ongoing production and maintenance applications. Substitute parts must maintain electrical compatibility while meeting the same mechanical and environmental specifications.

Key Parameters

Parameter	Value
Resistance	620 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 eligibility is determined by the following criteria:

Direct Substitutes maintain identical electrical specifications: 620 Ohms resistance, ±5% tolerance, 0.25W power rating, 1206 package, ±200ppm/°C temperature coefficient, and -55°C to 155°C operating range.

Upgrade Substitutes provide enhanced specifications while maintaining core compatibility: increased power rating (0.5W or 2/3W), improved tolerance (±1%), or automotive AEC-Q200 qualification. These parts are electrically and mechanically compatible but offer superior performance characteristics.

Similar Substitutes share the same resistance, tolerance, power rating, and package but may have minor dimensional or feature variations that do not affect functional compatibility.

All substitute parts maintain 1206 package compatibility, ROHS3 compliance, and MSL 1 rating.

Parameter Comparison

Part Number	Manufacturer	Resistance	Tolerance	Power (W)	Temp Coeff (ppm/°C)	Features	Status
MCR18ERTJ621	Rohm Semiconductor	620 Ω	±5%	0.25	±200	—	Discontinued
ERJ-8GEYJ621V	Panasonic	620 Ω	±5%	0.25	±200	AEC-Q200	Not For New Designs
RMCF1206JT620R	Stackpole Electronics	620 Ω	±5%	0.25	±200	AEC-Q200	Active
RC1206JR-07620RL	YAGEO	620 Ω	±5%	0.25	±100	Moisture Resistant	Active
CR1206-JW-621ELF	Bourns Inc.	620 Ω	±5%	0.25	±200	Moisture Resistant	Active
ESR18EZPJ621	Rohm Semiconductor	620 Ω	±5%	0.5	±200	AEC-Q200, Pulse Withstanding	Active
ERJ-P08J621V	Panasonic	620 Ω	±5%	0.667	±200	AEC-Q200, Pulse Withstanding	Active
KTR18EZPF6200	Rohm Semiconductor	620 Ω	±1%	0.25	±100	AEC-Q200, High Voltage	Active
ERJ-8ENF6200V	Panasonic	620 Ω	±1%	0.25	±100	AEC-Q200	Not For New Designs
RC1206FR-07620RL	YAGEO	620 Ω	±1%	0.25	±100	Moisture Resistant	Active
RMCF1206FT620R	Stackpole Electronics	620 Ω	±1%	0.25	±100	AEC-Q200	Active

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications): RMCF1206JT620R (Stackpole Electronics) is the primary recommendation. It maintains all electrical and mechanical specifications of the MCR18ERTJ621 while offering active product status and AEC-Q200 automotive qualification. RC1206JR-07620RL (YAGEO) provides an alternative with active status and moisture-resistant features, though temperature coefficient is ±100ppm/°C.

For Enhanced Reliability: ESR18EZPJ621 (Rohm Semiconductor) offers increased power rating (0.5W) and pulse withstanding capability while maintaining ±5% tolerance and active status. ERJ-P08J621V (Panasonic) provides 0.667W power rating with pulse withstanding features and AEC-Q200 qualification.

For Improved Tolerance Requirements: KTR18EZPF6200 (Rohm Semiconductor), RC1206FR-07620RL (YAGEO), and RMCF1206FT620R (Stackpole Electronics) all provide ±1% tolerance with 0.25W power rating. KTR18EZPF6200 includes high voltage capability; RC1206FR-07620RL and RMCF1206FT620R include AEC-Q200 qualification.

For Automotive Applications: RMCF1206JT620R, ESR18EZPJ621, KTR18EZPF6200, and RMCF1206FT620R all carry AEC-Q200 certification, suitable for automotive-grade applications.

Avoid for New Designs: ERJ-8GEYJ621V and ERJ-8ENF6200V are marked "Not For New Designs" and should be used only for legacy system maintenance.

Frequently Asked Questions (FAQ)

Q: Can I use a higher power-rated resistor as a substitute? A: Yes. ESR18EZPJ621 (0.5W) and ERJ-P08J621V (0.667W) are electrically and mechanically compatible with the MCR18ERTJ621 (0.25W). Higher power ratings provide additional thermal margin without affecting circuit function, provided the 1206 package footprint remains unchanged.

Q: What is the difference between ±5% and ±1% tolerance parts? A: Tolerance defines the maximum deviation from the nominal 620 Ohm value. ±5% allows ±31 Ohms deviation; ±1% allows ±6.2 Ohms deviation. Use ±1% parts (KTR18EZPF6200, RC1206FR-07620RL, RMCF1206FT620R) where 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 and are footprint-compatible with the MCR18ERTJ621. Dimensional variations are minor and do not affect PCB layout.

Q: What does AEC-Q200 certification mean? A: AEC-Q200 is an automotive qualification standard. Parts with this certification meet automotive reliability and environmental stress testing requirements. Use AEC-Q200 parts for automotive applications; standard parts are suitable for industrial and consumer applications.

Q: Why do some parts have different temperature coefficients? A: Temperature coefficient (±100ppm/°C vs ±200ppm/°C) indicates resistance change per degree Celsius. Lower values (±100ppm/°C) provide better stability across temperature ranges. Select based on circuit temperature sensitivity requirements.

Q: Can I substitute a part marked "Not For New Designs"? A: Parts marked "Not For New Designs" (ERJ-8GEYJ621V, ERJ-8ENF6200V) are suitable only for maintaining existing products or legacy systems. For new designs, select from parts with "Active" status.

Q: What is MSL 1 rating? A: MSL (Moisture Sensitivity Level) 1 indicates unlimited shelf life with no moisture precautions required. All listed parts carry MSL 1 rating, eliminating moisture-related handling concerns.

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