RMCS1206FT649R Equivalent & Substitute Parts

Part Overview

The RMCS1206FT649R is a 649 Ohm ±1% 0.25W thick film chip resistor in 1206 (3216 Metric) package manufactured by Stackpole Electronics Inc. This component is actively produced and widely used in general-purpose applications requiring precision resistive elements with anti-sulfur protection. Equivalent and substitute parts are necessary when the primary part experiences supply constraints, when design requirements mandate specific manufacturer certifications such as AEC-Q200 automotive qualification, or when alternative sourcing improves cost efficiency and inventory availability.

Key Parameters

Parameter	Value
Resistance	649 Ohms
Tolerance	±1%
Power Rating	0.25W (1/4W)
Package / Case	1206 (3216 Metric)
Composition	Thick Film
Temperature Coefficient	±100ppm/°C
Operating Temperature Range	-55°C ~ 155°C
Number of Terminations	2
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the RMCS1206FT649R is determined by strict equivalence across the following critical parameters:

Resistance value: 649 Ohms
Tolerance: ±1%
Power rating: 0.25W (1/4W)
Package: 1206 (3216 Metric)
Composition: Thick Film
Temperature coefficient: ±100ppm/°C
Operating temperature range: -55°C ~ 155°C
Termination count: 2
RoHS3 compliance
MSL rating: 1 (Unlimited)

All substitute parts listed meet these core electrical and mechanical specifications. Variations in physical dimensions (length, width, height) and additional certifications (such as AEC-Q200 automotive qualification or moisture-resistant features) do not prevent substitution but may be relevant for specific application requirements.

Parameter Comparison

Part Number	Manufacturer	Resistance	Tolerance	Power (W)	Package	Temp Coeff	Op. Temp Range	Composition	RoHS3	MSL	Product Status
RMCS1206FT649R	Stackpole Electronics Inc	649 Ω	±1%	0.25	1206	±100ppm/°C	-55°C ~ 155°C	Thick Film	Yes	1	Active
AC1206FR-07649RL	YAGEO	649 Ω	±1%	0.25	1206	±100ppm/°C	-55°C ~ 155°C	Thick Film	Yes	1	Active
CR1206-FX-6490ELF	Bourns Inc.	649 Ω	±1%	0.25	1206	±100ppm/°C	-55°C ~ 155°C	Thick Film	Yes	1	Active
CRCW1206649RFKEA	Vishay Dale	649 Ω	±1%	0.25	1206	±100ppm/°C	-55°C ~ 155°C	Thick Film	Yes	1	Active
ERJ-8ENF6490V	Panasonic Electronic Components	649 Ω	±1%	0.25	1206	±100ppm/°C	-55°C ~ 155°C	Thick Film	Yes	1	Not For New Designs
RC1206FR-07649RL	YAGEO	649 Ω	±1%	0.25	1206	±100ppm/°C	-55°C ~ 155°C	Thick Film	Yes	1	Active

Engineering Selection Recommendations

All listed substitute parts are electrically and mechanically equivalent to the RMCS1206FT649R and are suitable for direct replacement in applications where the primary part is unavailable.

For new designs and long-term production programs, select from parts with Active product status: AC1206FR-07649RL, CR1206-FX-6490ELF, CRCW1206649RFKEA, or RC1206FR-07649RL. These parts ensure continued availability and manufacturer support.

For automotive applications requiring AEC-Q200 qualification, select AC1206FR-07649RL, CRCW1206649RFKEA, or ERJ-8ENF6490V. These parts carry explicit AEC-Q200 certification.

The ERJ-8ENF6490V is designated "Not For New Designs" and should be used only for legacy system maintenance or repair applications where continuity with existing inventory is required.

Frequently Asked Questions (FAQ)

Q: Can I substitute the RMCS1206FT649R with any of the listed parts without circuit redesign?

A: Yes. All listed parts meet the core electrical specifications (649 Ω ±1%, 0.25W, ±100ppm/°C, -55°C ~ 155°C) and are packaged in the 1206 (3216 Metric) form factor with identical termination configuration. Direct substitution is electrically valid.

Q: What is the difference between parts with and without AEC-Q200 certification?

A: AEC-Q200 certification indicates the part has undergone automotive-grade qualification testing and is approved for use in automotive applications. Parts without this certification are suitable for general-purpose and industrial applications but should not be used in automotive designs requiring AEC-Q200 compliance.

Q: Why is ERJ-8ENF6490V marked "Not For New Designs"?

A: This designation indicates the manufacturer is phasing out this part number. While it remains functionally equivalent and suitable for existing applications, new designs should select from parts with Active status to ensure long-term availability and manufacturer support.

Q: Are there physical dimension differences between substitute parts?

A: Minor variations exist in maximum seated height (0.024" to 0.030") and length/width tolerances across manufacturers. These variations are within standard 1206 package specifications and do not affect PCB layout or assembly compatibility. Verify specific dimensions against your PCB design if tight mechanical constraints exist.

Q: Do all substitute parts have the same moisture sensitivity rating?

A: Yes. All parts listed carry MSL rating 1 (Unlimited), indicating no moisture sensitivity restrictions during storage, handling, or assembly.

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