RMC1/8-185JTP Equivalent & Substitute Parts

Part Overview

The RMC1/8-185JTP is a 1.8 MOhms ±5% 0.25W thick film chip resistor in 1206 (3216 Metric) package manufactured by Kamaya Inc. This component is classified as Active product status with 822 pieces currently in stock. The RMC series represents a standard general-purpose resistor suitable for industrial and commercial applications. Substitute parts are necessary to address supply chain continuity, alternative packaging formats, enhanced specifications, or specific application requirements such as automotive qualification or improved tolerance ratings.

Key Parameters

Parameter	Value	Specification Type
Resistance Value	1.8 MOhms	Electrical
Tolerance	±5%	Electrical
Power Rating	0.25W (1/4W)	Electrical
Package / Case	1206 (3216 Metric)	Mechanical
Composition	Thick Film	Material
Temperature Coefficient	±200ppm/°C	Electrical
Operating Temperature Range	-55°C ~ 155°C	Electrical
Number of Terminations	2	Mechanical
Moisture Sensitivity Level	1 (Unlimited)	Environmental

Substitute Part Grouping Explanation

Substitute parts for the RMC1/8-185JTP are grouped into two categories based on electrical and mechanical compatibility:

Direct Substitutes (Equivalent Specifications)

Direct substitutes maintain identical electrical specifications: 1.8 MOhms resistance, ±5% tolerance, 0.25W power rating, and 1206 package format. These parts are interchangeable at the circuit level without design modification. The following parameters must match for direct substitution:

Resistance: 1.8 MOhms
Tolerance: ±5%
Power Rating: 0.25W
Package: 1206 (3216 Metric)
Composition: Thick Film
Operating Temperature: -55°C ~ 155°C

Direct substitute parts include: KTR18EZPJ185, MCR18ERTJ185, RMCF1206JG1M80, RMCF1206JT1M80, and RC1206JR-071M8L.

Upgrade Substitutes (Enhanced Specifications)

Upgrade substitutes provide improved electrical performance while maintaining mechanical and thermal compatibility. These parts feature tighter tolerance (±1% instead of ±5%) and lower temperature coefficient (±100ppm/°C instead of ±200ppm/°C). Upgrade substitutes are electrically superior and can replace the original part in applications where enhanced precision is beneficial. The following parameters differ:

Tolerance: ±1% (improved from ±5%)
Temperature Coefficient: ±100ppm/°C (improved from ±200ppm/°C)

All other parameters remain compatible. Upgrade substitute parts include: ERJ-8ENF1804V, KTR18EZPF1804, RC1206FR-071M8L, and RMCF1206FT1M80.

Parameter Comparison

Part Number	Manufacturer	Resistance	Tolerance	Power (W)	Package	Temp Coeff	Op Temp Range	Composition	Features	Product Status
RMC1/8-185JTP	Kamaya Inc.	1.8 MOhms	±5%	0.25	1206	±200ppm/°C	-55°C ~ 155°C	Thick Film	—	Active
KTR18EZPJ185	Rohm Semiconductor	1.8 MOhms	±5%	0.25	1206	±200ppm/°C	-55°C ~ 155°C	Thick Film	Automotive AEC-Q200, High Voltage	Active
MCR18ERTJ185	Rohm Semiconductor	1.8 MOhms	±5%	0.25	1206	±200ppm/°C	-55°C ~ 155°C	Thick Film	—	Discontinued at DiGi Electronics
RMCF1206JG1M80	Stackpole Electronics Inc	1.8 MOhms	±5%	0.25	1206	±200ppm/°C	-55°C ~ 155°C	Thick Film	Automotive AEC-Q200	Active
RMCF1206JT1M80	Stackpole Electronics Inc	1.8 MOhms	±5%	0.25	1206	±200ppm/°C	-55°C ~ 155°C	Thick Film	Automotive AEC-Q200	Active
RC1206JR-071M8L	YAGEO	1.8 MOhms	±5%	0.25	1206	±100ppm/°C	-55°C ~ 155°C	Thick Film	Moisture Resistant	Active
ERJ-8ENF1804V	Panasonic Electronic Components	1.8 MOhms	±1%	0.25	1206	±100ppm/°C	-55°C ~ 155°C	Thick Film	Automotive AEC-Q200	Not For New Designs
KTR18EZPF1804	Rohm Semiconductor	1.8 MOhms	±1%	0.25	1206	±100ppm/°C	-55°C ~ 155°C	Thick Film	Automotive AEC-Q200, High Voltage	Active
RC1206FR-071M8L	YAGEO	1.8 MOhms	±1%	0.25	1206	±100ppm/°C	-55°C ~ 155°C	Thick Film	Moisture Resistant	Active
RMCF1206FT1M80	Stackpole Electronics Inc	1.8 MOhms	±1%	0.25	1206	±200ppm/°C	-55°C ~ 155°C	Thick Film	Automotive AEC-Q200	Active

Engineering Selection Recommendations

For Direct Substitution (Equivalent Performance)

When supply of RMC1/8-185JTP is unavailable, the following Active status parts provide direct electrical and mechanical equivalence:

KTR18EZPJ185 (Rohm Semiconductor) is recommended for applications requiring automotive qualification. This part carries AEC-Q200 certification and high voltage capability while maintaining identical electrical specifications. Inventory availability is 1610 pieces.

RMCF1206JG1M80 and RMCF1206JT1M80 (Stackpole Electronics Inc) are recommended for automotive applications. Both parts carry AEC-Q200 certification with inventory levels of 8825 and 3481 pieces respectively. RMCF1206JG1M80 is supplied in Cut Tape format, while RMCF1206JT1M80 is supplied in Tape & Reel format.

RC1206JR-071M8L (YAGEO) is recommended for applications requiring moisture-resistant characteristics. This part maintains ±5% tolerance with improved temperature coefficient (±100ppm/°C) and is supplied in Tape & Reel format with 2291 pieces in stock.

For Upgrade Substitution (Enhanced Specifications)

When circuit design permits tolerance improvement, the following Active status parts provide enhanced precision:

KTR18EZPF1804 (Rohm Semiconductor) is recommended for precision applications requiring automotive qualification. This part features ±1% tolerance, ±100ppm/°C temperature coefficient, AEC-Q200 certification, and high voltage capability. Inventory is 9087 pieces.

RC1206FR-071M8L (YAGEO) is recommended for precision applications requiring moisture resistance. This part features ±1% tolerance, ±100ppm/°C temperature coefficient, and is supplied in Tape & Reel format with 37993 pieces in stock.

RMCF1206FT1M80 (Stackpole Electronics Inc) is recommended for automotive precision applications. This part features ±1% tolerance, AEC-Q200 certification, and 13100 pieces in stock.

Parts to Avoid for New Designs

MCR18ERTJ185 (Rohm Semiconductor) is discontinued at DiGi Electronics and should not be selected for new designs despite 5770 pieces in stock.

ERJ-8ENF1804V (Panasonic Electronic Components) carries "Not For New Designs" status and should not be selected for new product development despite 39714 pieces in stock.

Frequently Asked Questions (FAQ)

Q: Can I use KTR18EZPJ185 as a direct replacement for RMC1/8-185JTP?

A: Yes. KTR18EZPJ185 maintains identical electrical specifications (1.8 MOhms ±5%, 0.25W) and mechanical compatibility (1206 package). The part is electrically interchangeable without circuit modification. KTR18EZPJ185 adds automotive AEC-Q200 qualification and high voltage capability, making it suitable for a broader range of applications.

Q: What is the difference between direct substitutes and upgrade substitutes?

A: Direct substitutes maintain the original ±5% tolerance and ±200ppm/°C temperature coefficient. Upgrade substitutes improve tolerance to ±1% and reduce temperature coefficient to ±100ppm/°C. Upgrade substitutes are electrically superior and can replace the original part in any application, but direct substitutes are required when the circuit design specifically requires ±5% tolerance.

Q: Are RMCF1206JG1M80 and RMCF1206JT1M80 interchangeable?

A: Yes, electrically and mechanically. Both parts are identical in electrical specifications and package format. The difference is packaging: RMCF1206JG1M80 is supplied in Cut Tape format, while RMCF1206JT1M80 is supplied in Tape & Reel format. Selection depends on assembly equipment compatibility and procurement requirements.

Q: Can I use RC1206FR-071M8L (±1% tolerance) in place of RMC1/8-185JTP (±5% tolerance)?

A: Yes. RC1206FR-071M8L is an upgrade substitute with tighter tolerance (±1%) and lower temperature coefficient (±100ppm/°C). It is electrically superior and maintains mechanical compatibility. This substitution is valid for any application where the original part is specified.

Q: Why is MCR18ERTJ185 listed as discontinued?

A: MCR18ERTJ185 is discontinued at DiGi Electronics, indicating end-of-life status at the primary distributor. Although inventory exists, this part should not be selected for new designs due to supply uncertainty and lack of long-term availability commitment.

Q: What does AEC-Q200 certification mean?

A: AEC-Q200 is an automotive qualification standard for passive components. Parts carrying this certification meet automotive industry reliability and performance requirements. AEC-Q200 certified parts are suitable for automotive applications and provide enhanced quality assurance compared to general-purpose parts.

Q: Can I substitute a part with lower temperature coefficient in my design?

A: Yes. Lower temperature coefficient (±100ppm/°C versus ±200ppm/°C) represents improved performance. Parts with lower temperature coefficient maintain more stable resistance values across the operating temperature range. This substitution improves circuit stability without introducing compatibility issues.

Q: What is the significance of moisture-resistant features in RC1206JR-071M8L and RC1206FR-071M8L?

A: Moisture-resistant thick film composition provides enhanced protection against humidity and environmental moisture exposure. This feature is beneficial for applications in high-humidity environments or where extended storage in non-controlled conditions is anticipated. For standard industrial applications, this feature is optional.

Q: Are all substitute parts RoHS3 compliant?

A: All substitute parts listed carry RoHS3 compliance status. The original RMC1/8-185JTP does not specify RoHS status in the provided data. All substitute parts meet current RoHS3 environmental compliance requirements.

Q: What packaging formats are available for these substitute parts?

A: Substitute parts are available in three packaging formats: Tape & Reel (TR), Cut Tape (CT), and Digi-Reel. Tape & Reel format is standard for automated assembly. Cut Tape format is suitable for manual assembly or small-volume production. Selection depends on assembly equipment and production volume requirements.

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