TMK042CG040CD-W Equivalent & Substitute Parts

Part Overview

The TMK042CG040CD-W is a 4 pF ceramic capacitor manufactured by Taiyo Yuden, rated for 25V with C0G/NP0 temperature coefficient characteristics. This component is packaged in 01005 (0402 Metric) form factor and is designated as Not For New Designs. Due to this product status classification, identification of equivalent and substitute parts is necessary for ongoing production support, maintenance applications, and design continuity where this component is already deployed.

Key Parameters

Parameter	Value
Capacitance	4 pF
Tolerance	±0.25pF
Voltage - Rated	25V
Temperature Coefficient	C0G, NP0
Operating Temperature Range	-55°C ~ 125°C
Package / Case	01005 (0402 Metric)
Mounting Type	Surface Mount, MLCC
Size / Dimension	0.016" L x 0.008" W (0.40mm x 0.20mm)
Thickness (Max)	0.009" (0.22mm)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the TMK042CG040CD-W is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

Capacitance: 4 pF
Voltage Rating: 25V
Temperature Coefficient: C0G/NP0
Package / Case: 01005 (0402 Metric)
Operating Temperature Range: -55°C ~ 125°C
Mounting Type: Surface Mount, MLCC
Physical Dimensions: 0.016" L x 0.008" W (0.40mm x 0.20mm)
Thickness (Max): 0.009" (0.22mm)

Tolerance Consideration: The main part specifies ±0.25pF tolerance. Substitute parts with equal or tighter tolerance (±0.1pF or ±0.25pF) are functionally equivalent. Parts with tighter tolerance represent an upgrade path.

Packaging Format: The main part is supplied in Tape & Reel (TR) format. Substitute parts may be supplied in alternative packaging formats (Cut Tape, Tape & Reel) without affecting electrical or mechanical compatibility.

Product Status and Compliance: Substitute parts with Active product status provide long-term availability assurance. All identified substitutes maintain ROHS3 compliance and MSL 1 rating, ensuring regulatory and environmental compatibility.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Capacitance	Tolerance	Voltage	Temp Coeff	Package	Product Status	Packaging Format	RoHS	MSL
TMK042CG040CD-W	Taiyo Yuden	4 pF	±0.25pF	25V	C0G, NP0	01005	Not For New Designs	Tape & Reel (TR)	ROHS3	1
TMK042CG040BD-W	Taiyo Yuden	4 pF	±0.1pF	25V	C0G, NP0	01005	Not For New Designs	Cut Tape (CT)	ROHS3	1
MLAST042SCG040CWNA01	Taiyo Yuden	4 pF	±0.25pF	25V	C0G, NP0	01005	Active	Tape & Reel (TR)	ROHS3	1
MSAST042SCG040CWNA01	Taiyo Yuden	4 pF	±0.25pF	25V	C0G, NP0	01005	Active	Tape & Reel (TR)	ROHS3	1
KGM02ACG1E4R0CH	KYOCERA AVX	4 pF	±0.25pF	25V	C0G, NP0	01005	Active	Tape & Reel (TR)	ROHS3	1
KGU02ACG1E4R0CH	KYOCERA AVX	4 pF	±0.25pF	25V	C0G, NP0	01005	Active	Tape & Reel (TR)	ROHS3	1

Engineering Selection Recommendations

Primary Substitutes (Taiyo Yuden Series):

MLAST042SCG040CWNA01 and MSAST042SCG040CWNA01 are parametrically equivalent to the main part with identical capacitance, tolerance, voltage rating, and temperature coefficient. Both parts carry Active product status, ensuring continued availability and manufacturing support. These parts are recommended for direct replacement in applications where the original TMK042CG040CD-W is specified.

Upgrade Path (Tighter Tolerance):

TMK042CG040BD-W offers improved tolerance specification (±0.1pF versus ±0.25pF) while maintaining all other electrical and mechanical parameters. This part is suitable for applications requiring higher capacitance precision. Product status remains Not For New Designs.

Cross-Manufacturer Alternatives (KYOCERA AVX):

KGM02ACG1E4R0CH and KGU02ACG1E4R0CH are parametrically equivalent alternatives from KYOCERA AVX with Active product status. Both parts maintain identical electrical specifications and physical form factor. KGU02ACG1E4R0CH is specified for RF, Microwave, and High Frequency applications with High Q and Low Loss characteristics, making it suitable for performance-critical circuits.

All identified substitutes maintain ROHS3 compliance and MSL 1 rating, ensuring compatibility with existing supply chain and manufacturing processes.

Frequently Asked Questions (FAQ)

Q: Can TMK042CG040BD-W replace TMK042CG040CD-W directly?

A: Yes. TMK042CG040BD-W is electrically and mechanically equivalent with identical capacitance (4 pF), voltage rating (25V), temperature coefficient (C0G/NP0), and package (01005). The tolerance specification is tighter (±0.1pF versus ±0.25pF), representing an upgrade. Packaging format differs (Cut Tape versus Tape & Reel) but does not affect component compatibility.

Q: What is the difference between MLAST042SCG040CWNA01 and MSAST042SCG040CWNA01?

A: Both parts are parametrically identical with 4 pF capacitance, ±0.25pF tolerance, 25V rating, and C0G/NP0 temperature coefficient. They differ in series designation (MLAS versus MSAS) and intended application scope. MLAST042SCG040CWNA01 is specified for Medical and Non-Critical applications, while MSAST042SCG040CWNA01 is designated for General Purpose applications. Both carry Active product status.

Q: Are KYOCERA AVX parts (KGM02ACG1E4R0CH and KGU02ACG1E4R0CH) suitable replacements?

A: Yes. Both KYOCERA AVX parts are parametrically equivalent with matching capacitance, tolerance, voltage, temperature coefficient, and package specifications. KGM02ACG1E4R0CH is for general purpose applications. KGU02ACG1E4R0CH includes High Q and Low Loss characteristics for RF and Microwave applications. Both carry Active product status and ROHS3 compliance.

Q: Does packaging format (Tape & Reel versus Cut Tape) affect component selection?

A: Packaging format does not affect electrical or mechanical compatibility. Selection between Tape & Reel and Cut Tape is determined by manufacturing process requirements and assembly equipment specifications, not component performance.

Q: Why is the original TMK042CG040CD-W marked "Not For New Designs"?

A: This designation indicates the part is in mature or end-of-life phase. For new designs, MLAST042SCG040CWNA01, MSAST042SCG040CWNA01, KGM02ACG1E4R0CH, or KGU02ACG1E4R0CH are recommended due to Active product status and assured long-term availability.

Q: What is the significance of MSL 1 rating?

A: MSL 1 (Moisture Sensitivity Level 1) indicates Unlimited shelf life without moisture control requirements. All identified substitutes maintain this rating, ensuring compatibility with standard storage and handling procedures.

Q: Can I use KGU02ACG1E4R0CH in general purpose applications?

A: Yes. KGU02ACG1E4R0CH meets all electrical and mechanical requirements for general purpose applications. The High Q and Low Loss characteristics specified for this part provide performance benefits in RF and Microwave circuits but do not restrict use in standard applications.

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