MCR18ERTJ512 Equivalent & Substitute Parts

Part Overview

The MCR18ERTJ512 is a 5.1 kOhms ±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 that maintain electrical and mechanical compatibility while meeting current design requirements.

Key Parameters

Parameter	Value
Resistance	5.1 kOhms
Tolerance	±5%
Power Rating	0.25W (1/4W)
Package	1206 (3216 Metric)
Composition	Thick Film
Operating Temperature	-55°C ~ 155°C
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for MCR18ERTJ512 are classified based on the following allowed parameters:

Primary Compatibility Criteria:

Resistance value: 5.1 kOhms (exact match required)
Package: 1206 (3216 Metric) (exact match required)
Composition: Thick Film (exact match required)
Operating temperature range: -55°C ~ 155°C (minimum requirement)
RoHS3 compliance (required for regulatory alignment)

Secondary Variation Parameters:

Tolerance: ±5% (baseline) or ±1% (upgrade)
Power rating: 0.25W (baseline), 0.667W (upgrade), or 0.75W (upgrade)
Temperature coefficient: ±200ppm/°C (baseline) or ±100ppm/°C (upgrade)
Features: Standard, Automotive AEC-Q200, or Pulse Withstanding capability

Substitutes are grouped into direct equivalents (matching tolerance and power rating) and upgrades (improved tolerance, higher power rating, or enhanced features).

Parameter Comparison

Manufacturer Part Number	Manufacturer	Resistance	Tolerance	Power (W)	Temp Coeff (ppm/°C)	Product Status	Features
MCR18ERTJ512	Rohm Semiconductor	5.1 kΩ	±5%	0.25	±200	Discontinued	Standard
RMCF1206JT5K10	Stackpole Electronics Inc	5.1 kΩ	±5%	0.25	±200	Active	Automotive AEC-Q200
ERJ-8GEYJ512V	Panasonic Electronic Components	5.1 kΩ	±5%	0.25	±200	Not For New Designs	Automotive AEC-Q200
RC1206JR-075K1L	YAGEO	5.1 kΩ	±5%	0.25	±100	Active	Moisture Resistant
KTR18EZPF5101	Rohm Semiconductor	5.1 kΩ	±1%	0.25	±100	Active	Automotive AEC-Q200, High Voltage
RMCF1206FT5K10	Stackpole Electronics Inc	5.1 kΩ	±1%	0.25	±100	Active	Automotive AEC-Q200
ERJ-8ENF5101V	Panasonic Electronic Components	5.1 kΩ	±1%	0.25	±100	Not For New Designs	Automotive AEC-Q200
RC1206FR-075K1L	YAGEO	5.1 kΩ	±1%	0.25	±100	Active	Moisture Resistant
RC3216F512CS	Samsung Electro-Mechanics	5.1 kΩ	±1%	0.25	±100	Active	Moisture Resistant
ERJ-P08J512V	Panasonic Electronic Components	5.1 kΩ	±5%	0.667	±200	Active	Automotive AEC-Q200, Pulse Withstanding
CRCW12065K10JNEAHP	Vishay Dale	5.1 kΩ	±5%	0.75	±200	Active	Automotive AEC-Q200, Pulse Withstanding

Engineering Selection Recommendations

Direct Equivalents (Matching Tolerance and Power Rating):

RMCF1206JT5K10 (Stackpole Electronics Inc) is the primary direct equivalent. It maintains ±5% tolerance and 0.25W power rating with identical electrical performance to MCR18ERTJ512. Product status is Active, ensuring long-term availability and supply chain stability. Automotive AEC-Q200 certification provides enhanced reliability for demanding applications.

RC1206JR-075K1L (YAGEO) is an alternative direct equivalent with Active product status. While tolerance is ±5%, temperature coefficient is ±100ppm/°C (improved from ±200ppm/°C). Moisture Resistant feature provides additional environmental protection.

Tolerance Upgrades (±1% Tolerance):

RMCF1206FT5K10 (Stackpole Electronics Inc) offers improved ±1% tolerance while maintaining 0.25W power rating and Active product status. Automotive AEC-Q200 certification is included. Temperature coefficient improves to ±100ppm/°C.

RC1206FR-075K1L (YAGEO) provides ±1% tolerance with Active product status and Moisture Resistant feature. Temperature coefficient is ±100ppm/°C.

RC3216F512CS (Samsung Electro-Mechanics) delivers ±1% tolerance with Active product status and Moisture Resistant feature. Limited inventory (752 Pcs) should be considered for long-term supply planning.

KTR18EZPF5101 (Rohm Semiconductor) offers ±1% tolerance with Active product status, Automotive AEC-Q200 certification, and High Voltage capability. Same manufacturer as original part.

Power Rating Upgrades:

ERJ-P08J512V (Panasonic Electronic Components) increases power rating to 0.667W (2/3W) while maintaining ±5% tolerance. Active product status and Automotive AEC-Q200 certification with Pulse Withstanding feature are included.

CRCW12065K10JNEAHP (Vishay Dale) increases power rating to 0.75W (3/4W) while maintaining ±5% tolerance. Active product status and Automotive AEC-Q200 certification with Pulse Withstanding feature are included.

Parts Not Recommended for New Designs:

ERJ-8GEYJ512V (Panasonic) and ERJ-8ENF5101V (Panasonic) carry "Not For New Designs" status and should be avoided for new product development despite adequate electrical specifications.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with ±1% tolerance instead of ±5%?

A: Yes. ±1% tolerance is a direct upgrade that maintains circuit compatibility. The original design accepts ±5% tolerance; a tighter ±1% tolerance will not cause functional issues and improves circuit accuracy.

Q: What is the difference between direct equivalents and upgrades?

A: Direct equivalents match the original part's tolerance (±5%) and power rating (0.25W). Upgrades improve one or more parameters: tolerance (±1%), power rating (0.667W or 0.75W), or temperature coefficient (±100ppm/°C vs ±200ppm/°C). All maintain the same 5.1 kOhms resistance and 1206 package.

Q: Are Automotive AEC-Q200 certified parts compatible with non-automotive applications?

A: Yes. AEC-Q200 certification indicates enhanced reliability and stricter manufacturing controls. These parts are fully compatible with standard industrial and consumer applications and provide superior performance margins.

Q: What does "Pulse Withstanding" feature mean?

A: Pulse Withstanding capability allows the resistor to handle transient overvoltage events without degradation. This feature is beneficial in circuits with switching transients or inductive load switching but is not required for standard DC or low-frequency AC applications.

Q: Can I substitute a 0.75W part for a 0.25W part?

A: Yes. Higher power rating provides additional thermal margin and is electrically compatible. The 0.75W part will operate cooler under the same current conditions, improving reliability and lifespan.

Q: Why is product status important?

A: Active status ensures long-term availability, consistent manufacturing, and supply chain reliability. "Not For New Designs" status indicates the manufacturer is phasing out the part; new designs should use Active alternatives to avoid future obsolescence.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance, matching the original MCR18ERTJ512 specification.

Q: What is Moisture Sensitivity Level (MSL) 1?

A: MSL 1 indicates unlimited shelf life without moisture baking requirements. All listed parts carry MSL 1, ensuring no special storage or handling procedures are necessary.

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