RMCS1206FT221R Equivalent & Substitute Parts

Part Overview

The RMCS1206FT221R is a 221 Ohm ±1% 0.25W thick film chip resistor in 1206 (3216 Metric) package manufactured by Stackpole Electronics Inc. This anti-sulfur variant is designed for general-purpose applications requiring standard reliability. The part is currently active in production with 890 pieces in stock. Substitute parts are necessary when the anti-sulfur variant is unavailable, when automotive-grade reliability (AEC-Q200) is required, when higher power ratings are needed, or when alternative manufacturers' inventory is more readily available.

Key Parameters

Parameter	Value
Resistance	221 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 to 155°C
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict adherence to the following core parameters:

Resistance Value: Must be 221 Ohms
Tolerance: Must be ±1%
Package: Must be 1206 (3216 Metric)
Composition: Must be Thick Film
Temperature Coefficient: Must be ±100ppm/°C
Operating Temperature Range: Must be -55°C to 155°C
RoHS Compliance: Must be ROHS3 Compliant
Moisture Sensitivity Level: Must be 1 (Unlimited)

All substitute parts listed meet these core electrical and mechanical parameters. Variations exist in power rating (0.25W or 0.75W), feature set (anti-sulfur, automotive AEC-Q200, moisture resistant, pulse withstanding), physical dimensions (minor variations within tolerance), and product status (active or not for new designs).

Parameter Comparison

Manufacturer Part Number	Manufacturer	Resistance	Tolerance	Power (Watts)	Features	Temp Coeff	Operating Temp	Package	Product Status	Inventory
RMCS1206FT221R	Stackpole Electronics Inc	221 Ohms	±1%	0.25W	Anti-Sulfur	±100ppm/°C	-55°C ~ 155°C	1206	Active	890 Pcs
RMCF1206FT221R	Stackpole Electronics Inc	221 Ohms	±1%	0.25W	Automotive AEC-Q200	±100ppm/°C	-55°C ~ 155°C	1206	Active	429700 Pcs
AC1206FR-07221RL	YAGEO	221 Ohms	±1%	0.25W	Automotive AEC-Q200, Moisture Resistant	±100ppm/°C	-55°C ~ 155°C	1206	Active	13127 Pcs
CR1206-FX-2210ELF	Bourns Inc.	221 Ohms	±1%	0.25W	Moisture Resistant	±100ppm/°C	-55°C ~ 155°C	1206	Active	29218 Pcs
CRCW1206221RFKEA	Vishay Dale	221 Ohms	±1%	0.25W	Automotive AEC-Q200	±100ppm/°C	-55°C ~ 155°C	1206	Active	19649 Pcs
CRCW1206221RFKEAHP	Vishay Dale	221 Ohms	±1%	0.75W	Automotive AEC-Q200, Pulse Withstanding	±100ppm/°C	-55°C ~ 155°C	1206	Active	6833 Pcs
ERJ-8ENF2210V	Panasonic Electronic Components	221 Ohms	±1%	0.25W	Automotive AEC-Q200	±100ppm/°C	-55°C ~ 155°C	1206	Not For New Designs	74595 Pcs
RC1206FR-07221RL	YAGEO	221 Ohms	±1%	0.25W	Moisture Resistant	±100ppm/°C	-55°C ~ 155°C	1206	Active	125869 Pcs

Engineering Selection Recommendations

For Active Production Designs: RMCF1206FT221R (Stackpole) is the primary substitute from the same manufacturer with automotive AEC-Q200 certification and the highest inventory availability (429,700 pieces). RC1206FR-07221RL (YAGEO) offers the largest inventory (125,869 pieces) with moisture-resistant construction and active product status.

For Automotive Applications: RMCF1206FT221R, AC1206FR-07221RL, CRCW1206221RFKEA, and CRCW1206221RFKEAHP all carry AEC-Q200 certification. CRCW1206221RFKEAHP provides higher power rating (0.75W) with pulse withstanding capability for demanding automotive circuits.

For Non-Automotive Applications: CR1206-FX-2210ELF (Bourns) and RC1206FR-07221RL (YAGEO) offer moisture-resistant construction without automotive certification, suitable for industrial and consumer applications.

Avoid for New Designs: ERJ-8ENF2210V (Panasonic) carries "Not For New Designs" status despite high inventory. Use only for legacy system maintenance or repair.

Frequently Asked Questions (FAQ)

Q: Can CRCW1206221RFKEAHP (0.75W) replace RMCS1206FT221R (0.25W)? A: Yes. The 0.75W part exceeds the power rating requirement and maintains all other electrical parameters. Higher power rating provides additional thermal margin without affecting circuit function.

Q: What is the difference between anti-sulfur and moisture-resistant variants? A: Anti-sulfur (RMCS1206FT221R) protects against sulfur contamination in high-sulfur environments. Moisture-resistant variants (CR1206-FX-2210ELF, RC1206FR-07221RL, AC1206FR-07221RL) provide protection against humidity and moisture ingress. These are distinct protective mechanisms for different environmental conditions.

Q: Are all substitutes physically interchangeable in the 1206 package? A: Yes. All parts use the 1206 (3216 Metric) package with identical footprint. Minor dimensional variations (length 0.122" to 0.126", height 0.024" to 0.030") fall within standard PCB design tolerances and do not affect placement or soldering.

Q: Why should ERJ-8ENF2210V be avoided despite high inventory? A: Panasonic has designated this part "Not For New Designs," indicating end-of-life status. While currently in stock, future availability is not guaranteed. Use only for repair of existing systems using this specific part number.

Q: Which substitute offers the best long-term availability? A: RMCF1206FT221R (Stackpole) with 429,700 pieces in stock and active product status offers the strongest long-term availability guarantee. RC1206FR-07221RL (YAGEO) with 125,869 pieces provides a secondary option.

Q: Can I use an AEC-Q200 part in a non-automotive application? A: Yes. AEC-Q200 certification exceeds standard requirements and is fully compatible with non-automotive applications. No performance degradation occurs.

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