RMCF1206FT1R21 Equivalent & Substitute Parts

Part Overview

The RMCF1206FT1R21 is a 1.21 Ohm ±1% 0.25W thick film chip resistor in 1206 (3216 Metric) package manufactured by Stackpole Electronics Inc. This automotive-grade component features AEC-Q200 qualification and is designed for high-reliability applications requiring stable resistance performance across extended temperature ranges. The part is currently active in production with 5820 units in stock. Substitute parts are identified to provide design flexibility, supply chain alternatives, and equivalent performance characteristics for applications where the primary part may be unavailable or where alternative sourcing is required.

Key Parameters

Parameter	Value
Resistance	1.21 Ohms
Tolerance	±1%
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
Number of Terminations	2
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the RMCF1206FT1R21 are qualified based on strict equivalence of the following critical parameters:

Resistance value: 1.21 Ohms
Tolerance: ±1%
Power rating: 0.25W (1/4W)
Package: 1206 (3216 Metric)
Composition: Thick Film
Temperature coefficient: ±200ppm/°C
Operating temperature range: -55°C ~ 155°C
Termination count: 2
RoHS3 compliance
MSL rating: 1 (Unlimited)

All identified substitute parts meet these core electrical and mechanical specifications. Variations in physical dimensions (length, width, height) and specific feature sets (automotive AEC-Q200 vs. moisture resistant) do not affect functional interchangeability within the defined parameter constraints.

Parameter Comparison

Parameter	RMCF1206FT1R21 (Stackpole)	CRCW12061R21FNEA (Vishay Dale)	RC1206FR-071R21L (YAGEO)
Resistance	1.21 Ohms	1.21 Ohms	1.21 Ohms
Tolerance	±1%	±1%	±1%
Power Rating	0.25W	0.25W	0.25W
Package / Case	1206 (3216 Metric)	1206 (3216 Metric)	1206 (3216 Metric)
Composition	Thick Film	Thick Film	Thick Film
Temperature Coefficient	±200ppm/°C	±200ppm/°C	±200ppm/°C
Operating Temperature	-55°C ~ 155°C	-55°C ~ 155°C	-55°C ~ 155°C
Number of Terminations	2	2	2
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Length	0.126" (3.20mm)	0.126" (3.20mm)	0.122" (3.10mm)
Width	0.063" (1.60mm)	0.063" (1.60mm)	0.063" (1.60mm)
Height - Seated (Max)	0.028" (0.70mm)	0.024" (0.60mm)	0.026" (0.65mm)
Product Status	Active	Active	Active
Inventory	5820 Pcs	15975 Pcs	7332 Pcs

Engineering Selection Recommendations

All three parts—RMCF1206FT1R21, CRCW12061R21FNEA, and RC1206FR-071R21L—are active production components with full RoHS3 compliance and MSL 1 rating. Selection among these equivalents should be based on:

RMCF1206FT1R21 (Stackpole Electronics Inc): Primary choice where automotive AEC-Q200 qualification is explicitly required. Suitable for high-reliability automotive and industrial applications.

CRCW12061R21FNEA (Vishay Dale): Alternative with highest current inventory (15975 units). Maintains automotive AEC-Q200 qualification. Slightly lower seated height (0.024" vs. 0.028") may provide marginal benefits in space-constrained designs.

RC1206FR-071R21L (YAGEO): Alternative featuring moisture-resistant construction. Slightly reduced length (0.122" vs. 0.126") and seated height (0.026" vs. 0.028"). Suitable where moisture resistance is a design consideration.

All parts are functionally equivalent for applications requiring 1.21 Ohm ±1% 0.25W thick film resistors in 1206 package with -55°C to 155°C operating range.

Frequently Asked Questions (FAQ)

Q: Can CRCW12061R21FNEA be used as a direct replacement for RMCF1206FT1R21?

A: Yes. Both parts share identical electrical specifications (1.21 Ohms ±1%, 0.25W, ±200ppm/°C, -55°C to 155°C) and package dimensions (1206 metric). Both carry AEC-Q200 automotive qualification and RoHS3 compliance. Physical height difference (0.024" vs. 0.028") is within typical PCB assembly tolerances.

Q: What is the difference between the automotive AEC-Q200 feature on RMCF1206FT1R21 and the moisture-resistant feature on RC1206FR-071R21L?

A: AEC-Q200 is an automotive industry qualification standard covering reliability and performance in automotive environments. Moisture-resistant construction refers to the component's resistance to moisture ingress. Both features address different application requirements. Selection depends on whether automotive qualification or enhanced moisture resistance is the primary design criterion.

Q: Are there any dimensional constraints that would prevent substitution?

A: All three parts conform to the 1206 (3216 Metric) package standard. Seated heights vary slightly (0.024" to 0.028"), but these variations fall within standard PCB assembly specifications and do not affect functional interchangeability. Length variations (0.122" to 0.126") are similarly within acceptable tolerances for 1206 package placement.

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

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

Q: Which part should be selected for maximum inventory availability?

A: CRCW12061R21FNEA (Vishay Dale) currently has the highest inventory at 15975 units, compared to 7332 units for RC1206FR-071R21L and 5820 units for RMCF1206FT1R21.

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