RMC1/8-684JTP Equivalent & Substitute Parts

Part Overview

The RMC1/8-684JTP is a 680 kOhms ±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 868 pieces in current inventory. Substitute parts are necessary when the primary part becomes unavailable, when specific certifications are required for application compliance, or when enhanced performance characteristics such as improved tolerance are needed.

Key Parameters

Parameter	Value
Resistance	680 kOhms
Tolerance	±5%
Power Rating	0.25W (1/4W)
Package / Case	1206 (3216 Metric)
Composition	Thick Film
Temperature Coefficient	±200ppm/°C
Operating Temperature Range	-55°C ~ 155°C
Moisture Sensitivity Level	1 (Unlimited)
Number of Terminations	2
Packaging Type	Tape & Reel (TR)

Substitute Part Grouping Explanation

Substitute parts for the RMC1/8-684JTP are classified into two categories based on electrical and mechanical compatibility:

Direct Substitutes (Equivalent Performance) Direct substitutes maintain identical electrical specifications: 680 kOhms resistance, ±5% tolerance, 0.25W power rating, 1206 package, thick film composition, ±200ppm/°C temperature coefficient, and -55°C to 155°C operating range. These parts are interchangeable without circuit redesign. Direct substitutes include ERJ-8GEYJ684V, RMCF1206JG680K, and RMCF1206JT680K.

Upgrade Substitutes (Enhanced Performance) Upgrade substitutes improve upon the main part specification by reducing tolerance from ±5% to ±1% and lowering temperature coefficient from ±200ppm/°C to ±100ppm/°C. All other parameters remain compatible: 680 kOhms resistance, 0.25W power rating, 1206 package, thick film composition, and -55°C to 155°C operating range. Upgrade substitutes include CRG1206F680K, ERJ-8ENF6803V, KTR18EZPF6803, MCR18ERTF6803, RC1206FR-07680KL, RC1206JR-07680KL, and RMCF1206FT680K.

The 1206 package dimension is the critical mechanical constraint. All substitute parts conform to 1206 (3216 Metric) package specifications with compatible footprints and termination counts.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Resistance	Tolerance	Power (W)	Package	Temp Coeff	Op Temp Range	Composition	Product Status	Packaging
RMC1/8-684JTP	Kamaya Inc.	680 kΩ	±5%	0.25	1206	±200ppm/°C	-55~155°C	Thick Film	Active	Tape & Reel
ERJ-8GEYJ684V	Panasonic	680 kΩ	±5%	0.25	1206	±200ppm/°C	-55~155°C	Thick Film	Not For New Designs	Tape & Reel
RMCF1206JG680K	Stackpole Electronics	680 kΩ	±5%	0.25	1206	±200ppm/°C	-55~155°C	Thick Film	Active	Cut Tape
RMCF1206JT680K	Stackpole Electronics	680 kΩ	±5%	0.25	1206	±200ppm/°C	-55~155°C	Thick Film	Active	Tape & Reel
CRG1206F680K	TE Connectivity	680 kΩ	±1%	0.25	1206	±100ppm/°C	-55~155°C	Thick Film	Active	Tape & Reel
ERJ-8ENF6803V	Panasonic	680 kΩ	±1%	0.25	1206	±100ppm/°C	-55~155°C	Thick Film	Not For New Designs	Tape & Reel
KTR18EZPF6803	Rohm Semiconductor	680 kΩ	±1%	0.25	1206	±100ppm/°C	-55~155°C	Thick Film	Active	Tape & Reel
MCR18ERTF6803	Rohm Semiconductor	680 kΩ	±1%	0.25	1206	±100ppm/°C	-55~155°C	Thick Film	Discontinued at DiGi Electronics	Cut Tape & Digi-Reel
RC1206FR-07680KL	YAGEO	680 kΩ	±1%	0.25	1206	±100ppm/°C	-55~155°C	Thick Film	Active	Cut Tape & Digi-Reel
RC1206JR-07680KL	YAGEO	680 kΩ	±5%	0.25	1206	±100ppm/°C	-55~155°C	Thick Film	Active	Tape & Reel
RMCF1206FT680K	Stackpole Electronics	680 kΩ	±1%	0.25	1206	±100ppm/°C	-55~155°C	Thick Film	Active	Tape & Reel

Engineering Selection Recommendations

For Direct Substitution (Equivalent Specifications)

RMCF1206JT680K (Stackpole Electronics) is the primary direct substitute. This part maintains all electrical and mechanical specifications of the RMC1/8-684JTP while offering Active product status and AEC-Q200 automotive qualification. It is available in Tape & Reel packaging matching the original part format. Inventory availability is 2,469 pieces.

RMCF1206JG680K (Stackpole Electronics) provides an alternative direct substitute with identical electrical specifications and Active status. This part is available in Cut Tape packaging with higher inventory (14,722 pieces), suitable for applications where tape format is acceptable.

ERJ-8GEYJ684V (Panasonic Electronic Components) is a direct electrical equivalent with AEC-Q200 automotive qualification and high inventory (50,819 pieces). However, this part carries "Not For New Designs" status, limiting its use to legacy system support or replacement applications only.

For Upgraded Performance

RMCF1206FT680K (Stackpole Electronics) is the recommended upgrade substitute. This part improves tolerance to ±1% and reduces temperature coefficient to ±100ppm/°C while maintaining Active product status, AEC-Q200 automotive qualification, and Tape & Reel packaging. It is suitable for applications requiring enhanced precision and stability.

KTR18EZPF6803 (Rohm Semiconductor) offers ±1% tolerance and ±100ppm/°C temperature coefficient with Active status and AEC-Q200 automotive qualification. This part includes High Voltage features and maintains Tape & Reel packaging with 38,003 pieces in inventory.

RC1206FR-07680KL (YAGEO) provides ±1% tolerance upgrade with moisture-resistant thick film composition, Active status, and 68,802 pieces in inventory. This part is available in Cut Tape & Digi-Reel format.

Compliance Considerations

All listed substitute parts are ROHS3 compliant and REACH unaffected. Parts with AEC-Q200 automotive qualification (RMCF1206JT680K, RMCF1206JG680K, ERJ-8GEYJ684V, KTR18EZPF6803, RMCF1206FT680K) are suitable for automotive applications. Parts marked "Not For New Designs" (ERJ-8GEYJ684V, ERJ-8ENF6803V) should be used only for legacy system maintenance or replacement scenarios.

Frequently Asked Questions (FAQ)

Q: Can I use RMCF1206JT680K as a direct replacement for RMC1/8-684JTP?

A: Yes. RMCF1206JT680K is a direct substitute with identical electrical specifications: 680 kOhms ±5%, 0.25W power rating, 1206 package, thick film composition, ±200ppm/°C temperature coefficient, and -55°C to 155°C operating range. Both parts are available in Tape & Reel packaging and are mechanically and electrically interchangeable.

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 performance by reducing tolerance to ±1% and temperature coefficient to ±100ppm/°C. All other parameters remain identical. Upgrade substitutes are suitable when circuit design requires higher precision or better temperature stability.

Q: Why do some parts show "Not For New Designs" status?

A: Parts marked "Not For New Designs" are legacy components that manufacturers no longer recommend for new circuit designs. These parts may be used for replacement or maintenance of existing systems. For new designs, select parts with Active status such as RMCF1206JT680K, CRG1206F680K, or KTR18EZPF6803.

Q: Are all substitute parts available in Tape & Reel packaging?

A: No. Some substitutes are available only in Cut Tape or Cut Tape & Digi-Reel formats. For Tape & Reel packaging specifically, select from: RMCF1206JT680K, ERJ-8GEYJ684V, CRG1206F680K, ERJ-8ENF6803V, KTR18EZPF6803, RC1206JR-07680KL, or RMCF1206FT680K.

Q: Do I need AEC-Q200 automotive qualification for my application?

A: AEC-Q200 qualification is required only for automotive applications. If your circuit is used in automotive systems, select parts with AEC-Q200 ratings: RMCF1206JT680K, RMCF1206JG680K, ERJ-8GEYJ684V, ERJ-8ENF6803V, KTR18EZPF6803, or RMCF1206FT680K. For non-automotive applications, any listed substitute is acceptable based on other selection criteria.

Q: What is the difference between RMCF1206JG680K and RMCF1206JT680K?

A: Both parts are manufactured by Stackpole Electronics with identical electrical specifications and Active status. The primary difference is packaging format: RMCF1206JG680K is supplied in Cut Tape format with 14,722 pieces in inventory, while RMCF1206JT680K is supplied in Tape & Reel format with 2,469 pieces in inventory. Select based on your assembly process requirements.

Q: Can I use RC1206FR-07680KL as an upgrade for better temperature stability?

A: Yes. RC1206FR-07680KL provides ±1% tolerance and ±100ppm/°C temperature coefficient, improving upon the original ±5% tolerance and ±200ppm/°C coefficient. This part maintains the 1206 package, 0.25W power rating, and -55°C to 155°C operating range. It includes moisture-resistant thick film composition and is available in Cut Tape & Digi-Reel format with 68,802 pieces in inventory.

Q: Is MCR18ERTF6803 still available for new orders?

A: MCR18ERTF6803 is marked as "Discontinued at DiGi Electronics" with only 1,838 pieces remaining in inventory. While it offers ±1% tolerance and ±100ppm/°C temperature coefficient, it is not recommended for new designs. Use active alternatives such as RMCF1206FT680K, KTR18EZPF6803, or RC1206FR-07680KL instead.

Q: Do all substitute parts have the same physical dimensions?

A: All substitute parts conform to the 1206 (3216 Metric) package specification. However, minor dimensional variations exist within tolerance. The main part RMC1/8-684JTP measures 0.122" L x 0.063" W (3.10mm x 1.60mm) with 0.025" max height. Most substitutes measure 0.126" L x 0.063" W (3.20mm x 1.60mm) with 0.028" max height. These variations remain within standard PCB footprint tolerances and do not affect mechanical compatibility.

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