RMCF1206FG1K21 Equivalent & Substitute Parts

Part Overview

The RMCF1206FG1K21 is a 1.21 kOhms ±1% 0.25W thick film chip resistor in 1206 (3216 Metric) package manufactured by Stackpole Electronics Inc. This component is rated for automotive applications under AEC-Q200 standard with an operating temperature range of -55°C to 155°C. The part is currently active in production with 786 pieces in stock. Substitute parts are necessary to address supply chain constraints, alternative sourcing requirements, or specific application needs while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	Value
Resistance	1.21 kOhms
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 for the RMCF1206FG1K21 is determined by strict equivalence across the following parameters:

Resistance value: 1.21 kOhms
Tolerance: ±1%
Power rating: 0.25W (1/4W)
Package type: 1206 (3216 Metric)
Composition: Thick Film
Temperature coefficient: ±100ppm/°C
Operating temperature range: -55°C to 155°C
RoHS compliance: ROHS3 Compliant
Moisture sensitivity level: 1 (Unlimited)

All listed substitute parts meet these core electrical and mechanical specifications. Variations in physical dimensions (length, width, height) and manufacturer-specific features (automotive AEC-Q200 rating, moisture resistance) are noted but do not preclude substitution when the primary parameters align.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Resistance	Tolerance	Power (W)	Package	Temp Coeff (ppm/°C)	Op. Temp Range (°C)	AEC-Q200	Inventory (Pcs)	Product Status
RMCF1206FG1K21	Stackpole Electronics Inc	1.21 kΩ	±1%	0.25	1206	±100	-55 to 155	Yes	786	Active
RMCF1206FT1K21	Stackpole Electronics Inc	1.21 kΩ	±1%	0.25	1206	±100	-55 to 155	Yes	25635	Active
CR1206-FX-1211ELF	Bourns Inc.	1.21 kΩ	±1%	0.25	1206	±100	-55 to 155	No	45750	Active
CRCW12061K21FKEA	Vishay Dale	1.21 kΩ	±1%	0.25	1206	±100	-55 to 155	Yes	39009	Active
ERJ-8ENF1211V	Panasonic Electronic Components	1.21 kΩ	±1%	0.25	1206	±100	-55 to 155	Yes	55450	Not For New Designs
AC1206FR-071K21L	YAGEO	1.21 kΩ	±1%	0.25	1206	±100	-55 to 155	Yes	5061	Active
CRCW12061K21FKEAC	Vishay Dale	1.21 kΩ	±1%	0.25	1206	±100	-55 to 155	No	28775	Active
RC1206FR-071K21L	YAGEO	1.21 kΩ	±1%	0.25	1206	±100	-55 to 155	No	282123	Active

Engineering Selection Recommendations

For applications requiring AEC-Q200 automotive qualification, the following parts maintain full compliance: RMCF1206FT1K21 (Stackpole), CRCW12061K21FKEA (Vishay Dale), ERJ-8ENF1211V (Panasonic), and AC1206FR-071K21L (YAGEO). Among these, RMCF1206FT1K21 offers the highest inventory availability (25,635 pieces) from the same manufacturer as the primary part, ensuring consistency in manufacturing processes and performance characteristics.

For non-automotive applications or where AEC-Q200 is not required, CR1206-FX-1211ELF (Bourns), CRCW12061K21FKEAC (Vishay Dale), and RC1206FR-071K21L (YAGEO) are viable alternatives. RC1206FR-071K21L provides the largest inventory pool (282,123 pieces) and is actively produced.

ERJ-8ENF1211V is marked as "Not For New Designs" and should be avoided for new product development, though it remains available for legacy system support.

Frequently Asked Questions (FAQ)

Q: Can I substitute RMCF1206FG1K21 with any of the listed parts?

A: All listed parts share identical electrical specifications (1.21 kΩ, ±1%, 0.25W, ±100ppm/°C, -55°C to 155°C operating range) and the same 1206 package. Physical dimensions vary slightly between manufacturers but remain within acceptable tolerances for standard PCB layouts. Substitution is electrically and mechanically valid.

Q: Does AEC-Q200 rating matter for my application?

A: AEC-Q200 certification is required only for automotive applications. If your design is for automotive use, select from parts explicitly rated AEC-Q200: RMCF1206FT1K21, CRCW12061K21FKEA, ERJ-8ENF1211V, or AC1206FR-071K21L. For consumer or industrial applications, non-automotive rated parts are acceptable.

Q: Why is ERJ-8ENF1211V marked "Not For New Designs"?

A: This designation indicates the manufacturer has discontinued active development for this part. While currently in stock and functional, it should not be selected for new product designs. Use this part only for legacy system repairs or maintenance.

Q: What is the difference between CRCW12061K21FKEA and CRCW12061K21FKEAC?

A: Both are Vishay Dale parts with identical electrical specifications. The suffix difference indicates different manufacturing batches or packaging configurations. CRCW12061K21FKEA is explicitly rated AEC-Q200, while CRCW12061K21FKEAC is not. Select based on your automotive qualification requirements.

Q: Are there any moisture or environmental concerns with these parts?

A: All parts carry Moisture Sensitivity Level (MSL) 1, indicating unlimited shelf life without special moisture control measures. All are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards.

Q: Which substitute offers the best availability?

A: RC1206FR-071K21L (YAGEO) has the highest inventory at 282,123 pieces. If AEC-Q200 is required, RMCF1206FT1K21 (Stackpole) offers 25,635 pieces, the highest among automotive-rated alternatives.

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