CL21B684KOFNFNE Equivalent & Substitute Parts

Part Overview

The CL21B684KOFNFNE is a 0.68 µF ±10% 16V ceramic capacitor manufactured by Samsung Electro-Mechanics in the 0805 (2012 Metric) package with X7R temperature coefficient. This multilayer ceramic capacitor (MLCC) is designed for general-purpose applications requiring stable capacitance across the operating temperature range of -55°C to 125°C. The part is ROHS3 compliant with MSL 1 rating, indicating unlimited moisture sensitivity protection.

Identifying equivalent and substitute parts is necessary when the original part becomes unavailable, when design requirements change to accommodate higher voltage ratings, when tolerance specifications must be tightened, or when alternative packaging formats are required for manufacturing optimization.

Key Parameters

Parameter	Value
Capacitance	0.68 µF
Tolerance	±10%
Voltage Rating	16V
Temperature Coefficient	X7R
Package / Case	0805 (2012 Metric)
Mounting Type	Surface Mount, MLCC
Operating Temperature Range	-55°C to 125°C
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the CL21B684KOFNFNE are classified based on the following substitution criteria:

Critical Parameters (Must Match):

Capacitance: 0.68 µF
Temperature Coefficient: X7R
Package / Case: 0805 (2012 Metric)
Mounting Type: Surface Mount, MLCC
Operating Temperature Range: -55°C to 125°C
RoHS Status: ROHS3 Compliant
MSL Rating: 1 (Unlimited)

Flexible Parameters (May Vary):

Tolerance: ±10% or ±5%
Voltage Rating: 16V or higher (25V, 50V)
Packaging Format: Tape & Reel (TR), Cut Tape (CT), or Digi-Reel®
Product Status: Active or Obsolete
Manufacturer: Samsung Electro-Mechanics, KEMET, TDK Corporation, Murata Electronics, KYOCERA AVX

Substitutes are grouped into three categories: Upgrade parts with improved tolerance or voltage ratings, Parametric Equivalents with identical electrical specifications but different packaging or product status, and Direct Equivalents from alternative manufacturers with matching core specifications.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Capacitance	Tolerance	Voltage	Temp Coeff	Package	Product Status	Packaging Format
CL21B684KOFNFNE	Samsung Electro-Mechanics	0.68 µF	±10%	16V	X7R	0805	Active	Bulk
CL21B684JOFNNNE	Samsung Electro-Mechanics	0.68 µF	±5%	16V	X7R	0805	Active	Tape & Reel (TR)
CL21B684KOFVPNE	Samsung Electro-Mechanics	0.68 µF	±10%	16V	X7R	0805	Active	Tape & Reel (TR)
CL21B684KOFNNNE	Samsung Electro-Mechanics	0.68 µF	±10%	16V	X7R	0805	Obsolete	Cut Tape (CT) & Digi-Reel®
CL21B684KOFNNNG	Samsung Electro-Mechanics	0.68 µF	±10%	16V	X7R	0805	Obsolete	Cut Tape (CT)
C0805C684K4RAC7800	KEMET	0.68 µF	±10%	16V	X7R	0805	Active	Tape & Reel (TR)
C2012X7R1C684K125AA	TDK Corporation	0.68 µF	±10%	16V	X7R	0805	Not For New Designs	Tape & Reel (TR)
GRM219R71C684KA01D	Murata Electronics	0.68 µF	±10%	16V	X7R	0805	Not For New Designs	Tape & Reel (TR)
KGM21AR71C684KU	KYOCERA AVX	0.68 µF	±10%	16V	X7R	0805	Active	Tape & Reel (TR)
C0805C684K3RAC7800	KEMET	0.68 µF	±10%	25V	X7R	0805	Active	Tape & Reel (TR)
C0805C684K5RAC7800	KEMET	0.68 µF	±10%	50V	X7R	0805	Active	Tape & Reel (TR)

Engineering Selection Recommendations

For Active Production (Recommended Primary Choices):

Select CL21B684JOFNNNE when tolerance specification can be tightened to ±5% and Tape & Reel packaging is required. This Samsung part maintains the same manufacturer lineage and offers improved capacitance accuracy.

Select C0805C684K4RAC7800 (KEMET) when cross-manufacturer sourcing is necessary for supply chain resilience. This part is actively produced and suitable for bypass and decoupling applications.

Select KGM21AR71C684KU (KYOCERA AVX) as an alternative active source from a major capacitor manufacturer with established quality systems.

For Voltage Margin Applications:

Select C0805C684K3RAC7800 (KEMET, 25V) or C0805C684K5RAC7800 (KEMET, 50V) when circuit design requires higher voltage derating margins or when operating conditions may exceed the original 16V specification.

For Automotive Applications:

Select CL21B684KOFVPNE when AEC-Q200 automotive qualification is required. This Samsung part carries automotive ratings while maintaining identical electrical specifications.

Avoid for New Designs:

Do not select CL21B684KOFNNNE, CL21B684KOFNNNG, C2012X7R1C684K125AA, or GRM219R71C684KA01D for new product development. These parts carry Obsolete or Not For New Designs status and should be used only for legacy system maintenance or repair.

Frequently Asked Questions (FAQ)

Q: Can CL21B684JOFNNNE replace CL21B684KOFNFNE directly?

A: Yes. CL21B684JOFNNNE is a direct substitute with tighter tolerance (±5% versus ±10%). The improved tolerance makes it suitable for applications where capacitance accuracy is critical. Both parts share identical capacitance, voltage, temperature coefficient, package, and operating temperature range.

Q: What is the difference between the packaging formats listed?

A: Bulk packaging ships loose components. Tape & Reel (TR) provides components on continuous tape for automated assembly. Cut Tape (CT) provides tape segments. Digi-Reel® is a proprietary reel format. Selection depends on manufacturing equipment compatibility and order quantities.

Q: Can I use a 25V or 50V rated capacitor in place of the 16V part?

A: Yes. Higher voltage-rated capacitors (C0805C684K3RAC7800 at 25V or C0805C684K5RAC7800 at 50V) are direct substitutes for 16V applications. The higher voltage rating provides additional safety margin and derating capability. Physical dimensions remain identical within the 0805 package class.

Q: Why are some parts marked as Obsolete or Not For New Designs?

A: Manufacturers discontinue parts for various reasons including process optimization, supply consolidation, or technology transitions. Parts marked Obsolete or Not For New Designs should not be selected for new product development. Use Active status parts for new designs to ensure long-term availability and support.

Q: Are all listed substitutes ROHS3 compliant?

A: Yes. All parts in this substitution list are ROHS3 compliant with MSL 1 rating, meeting environmental and moisture sensitivity requirements for standard manufacturing and storage conditions.

Q: What is the significance of the X7R temperature coefficient?

A: X7R specifies that capacitance variation remains within ±15% across the full operating temperature range of -55°C to 125°C. This stability makes X7R suitable for general-purpose applications where temperature compensation is not required. All listed substitutes maintain this specification.

Q: Can I substitute parts from different manufacturers?

A: Yes. KEMET C0805C684K4RAC7800, KYOCERA AVX KGM21AR71C684KU, TDK C2012X7R1C684K125AA, and Murata GRM219R71C684KA01D all meet the electrical and mechanical specifications. Cross-manufacturer substitution is valid when all critical parameters match. Verify with your procurement and quality teams for any supplier qualification requirements.

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