RMCS1206FT90R9 Equivalent & Substitute Parts

Part Overview

The RMCS1206FT90R9 is a 90.9 Ohm ±1% 0.25W thick film chip resistor in 1206 (3216 Metric) package manufactured by Stackpole Electronics Inc. This component is classified as Active status and features anti-sulfur construction with ROHS3 compliance. Substitute parts are necessary when the primary part experiences supply constraints, extended lead times, or when design requirements mandate specific certifications such as automotive AEC-Q200 qualification or alternative moisture resistance specifications.

Key Parameters

Parameter	Value
Resistance	90.9 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
Terminations	2
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the RMCS1206FT90R9 is determined by strict equivalence across the following parameters:

Resistance value: 90.9 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
RoHS compliance: ROHS3 Compliant
Moisture sensitivity: MSL 1 (Unlimited)

All substitute parts listed meet these core electrical and mechanical requirements. Variations in physical dimensions (length, width, height) within standard tolerances and differences in feature sets (automotive certification, moisture resistance enhancements) do not affect functional substitutability for this resistance value and power rating combination.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Resistance	Tolerance	Power (W)	Package	Temp Coeff	Op. Temp Range	Features	Product Status	RoHS
RMCS1206FT90R9	Stackpole Electronics Inc	90.9 Ω	±1%	0.25	1206	±100ppm/°C	-55°C ~ 155°C	Anti-Sulfur	Active	ROHS3
AC1206FR-0790R9L	YAGEO	90.9 Ω	±1%	0.25	1206	±100ppm/°C	-55°C ~ 155°C	Automotive AEC-Q200, Moisture Resistant	Active	ROHS3
CR1206-FX-90R9ELF	Bourns Inc.	90.9 Ω	±1%	0.25	1206	±100ppm/°C	-55°C ~ 155°C	Moisture Resistant	Active	ROHS3
CRCW120690R9FKEA	Vishay Dale	90.9 Ω	±1%	0.25	1206	±100ppm/°C	-55°C ~ 155°C	Automotive AEC-Q200	Active	ROHS3
ERJ-8ENF90R9V	Panasonic Electronic Components	90.9 Ω	±1%	0.25	1206	±100ppm/°C	-55°C ~ 155°C	Automotive AEC-Q200	Not For New Designs	ROHS3
RC1206FR-0790R9L	YAGEO	90.9 Ω	±1%	0.25	1206	±100ppm/°C	-55°C ~ 155°C	Moisture Resistant	Active	ROHS3

Engineering Selection Recommendations

For applications requiring Active product status with current manufacturing support, AC1206FR-0790R9L, CR1206-FX-90R9ELF, CRCW120690R9FKEA, and RC1206FR-0790R9L are suitable alternatives to RMCS1206FT90R9.

For automotive applications requiring AEC-Q200 certification, AC1206FR-0790R9L, CRCW120690R9FKEA, and ERJ-8ENF90R9V meet this requirement. Note that ERJ-8ENF90R9V carries "Not For New Designs" status and should be used only for legacy system support or existing production continuity.

For applications where moisture resistance is a design requirement, AC1206FR-0790R9L, CR1206-FX-90R9ELF, and RC1206FR-0790R9L provide enhanced moisture resistance specifications.

All listed substitutes maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with standard PCB assembly and storage conditions.

Frequently Asked Questions (FAQ)

Q: Can RMCS1206FT90R9 be directly replaced with any of these substitute parts?

A: Yes. All substitute parts share identical electrical specifications (90.9 Ohms ±1%, 0.25W, ±100ppm/°C, -55°C ~ 155°C) and package format (1206). Physical dimension variations are within standard manufacturing tolerances and do not affect circuit performance or PCB layout compatibility.

Q: What is the difference between anti-sulfur and moisture-resistant features?

A: Anti-sulfur construction in RMCS1206FT90R9 protects against sulfur-containing atmospheric corrosion. Moisture-resistant variants (AC1206FR-0790R9L, CR1206-FX-90R9ELF, RC1206FR-0790R9L) provide enhanced protection against moisture ingress. Both feature sets are compatible with standard PCB assembly processes and do not require design modifications.

Q: Why is ERJ-8ENF90R9V marked "Not For New Designs"?

A: This designation indicates the manufacturer has discontinued active development for new applications. ERJ-8ENF90R9V remains functionally equivalent and electrically interchangeable but should be reserved for legacy system maintenance or existing production lines requiring continuity.

Q: Are AEC-Q200 certified parts required for non-automotive applications?

A: No. AEC-Q200 certification is specific to automotive-grade reliability standards. For non-automotive applications, any Active status substitute part (AC1206FR-0790R9L, CR1206-FX-90R9ELF, CRCW120690R9FKEA, RC1206FR-0790R9L) provides equivalent performance without automotive qualification overhead.

Q: Do physical dimension differences affect PCB footprint compatibility?

A: No. All parts conform to the 1206 (3216 Metric) package standard. Minor variations in seated height (0.024" to 0.030") and length/width tolerances (3.10mm to 3.20mm range) fall within standard PCB design rules and do not require layout modifications.

Q: What is the significance of MSL 1 (Unlimited) rating?

A: MSL 1 indicates unlimited shelf life under standard storage conditions (≤30°C, ≤85% relative humidity). No special moisture-barrier packaging or baking procedures are required before assembly, simplifying inventory management and supply chain logistics.

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