TMK042CG4R4CD-W Equivalent & Substitute Parts

Part Overview

The TMK042CG4R4CD-W is a 4.4 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 as a surface-mount multilayer ceramic capacitor (MLCC). The part is designated as "Not For New Designs," indicating its legacy status in the product portfolio. Identification of equivalent and substitute parts is necessary to support existing designs, ensure supply chain continuity, and evaluate active alternatives that meet the same electrical and mechanical specifications.

Key Parameters

Parameter	Value
Capacitance	4.4 pF
Tolerance	±0.25 pF
Voltage Rating	25V
Temperature Coefficient	C0G, NP0
Operating Temperature Range	-55°C to 125°C
Package / Case	01005 (0402 Metric)
Mounting Type	Surface Mount, MLCC
Physical Dimensions	0.016" L x 0.008" W (0.40 mm x 0.20 mm)
Thickness (Max)	0.009" (0.22 mm)
Moisture Sensitivity Level	MSL 1 (Unlimited)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the TMK042CG4R4CD-W is determined by strict equivalence across the following critical parameters:

Electrical Parameters:

Capacitance value: 4.4 pF (exact match required)
Voltage rating: 25V (minimum requirement)
Temperature coefficient: C0G/NP0 (mandatory for stability)
Operating temperature range: -55°C to 125°C (full range compatibility)

Mechanical Parameters:

Package type: 01005 (0402 Metric) surface-mount form factor
Mounting technology: MLCC (multilayer ceramic capacitor)
Physical dimensions: 0.016" L x 0.008" W, 0.009" max thickness

Compliance Parameters:

RoHS3 compliance
Moisture sensitivity: MSL 1

Substitute parts are grouped into two categories: an upgrade option with tighter tolerance specification, and parametric equivalents with active product status. All substitutes maintain identical electrical performance and mechanical compatibility with the original part.

Parameter Comparison

Parameter	TMK042CG4R4CD-W (Main)	TMK042CG4R4BD-W (Upgrade)	MLAST042SCG4R4CWNA01 (Equivalent)	MSAST042SCG4R4CWNA01 (Equivalent)
Manufacturer	Taiyo Yuden	Taiyo Yuden	Taiyo Yuden	Taiyo Yuden
Capacitance	4.4 pF	4.4 pF	4.4 pF	4.4 pF
Tolerance	±0.25 pF	±0.1 pF	±0.25 pF	±0.25 pF
Voltage Rating	25V	25V	25V	25V
Temperature Coefficient	C0G, NP0	C0G, NP0	C0G, NP0	C0G, NP0
Operating Temperature	-55°C to 125°C	-55°C to 125°C	-55°C to 125°C	-55°C to 125°C
Package / Case	01005 (0402 Metric)	01005 (0402 Metric)	01005 (0402 Metric)	01005 (0402 Metric)
Mounting Type	Surface Mount, MLCC	Surface Mount, MLCC	Surface Mount, MLCC	Surface Mount, MLCC
Physical Dimensions	0.016" L x 0.008" W (0.40 mm x 0.20 mm)	0.016" L x 0.008" W (0.40 mm x 0.20 mm)	0.016" L x 0.008" W (0.40 mm x 0.20 mm)	0.016" L x 0.008" W (0.40 mm x 0.20 mm)
Thickness (Max)	0.009" (0.22 mm)	0.009" (0.22 mm)	0.009" (0.22 mm)	0.009" (0.22 mm)
Moisture Sensitivity Level	MSL 1 (Unlimited)	MSL 1 (Unlimited)	MSL 1 (Unlimited)	MSL 1 (Unlimited)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Not For New Designs	Not For New Designs	Active	Active
Series	M	M	MLAS	MSAS
Packaging Type	Tape & Reel (TR)	Cut Tape (CT)	Tape & Reel (TR)	Tape & Reel (TR)

Engineering Selection Recommendations

TMK042CG4R4BD-W (Upgrade Option): This part provides a direct upgrade path from the TMK042CG4R4CD-W. It maintains identical electrical and mechanical specifications while offering improved tolerance performance (±0.1 pF versus ±0.25 pF). Both parts share "Not For New Designs" status, indicating legacy positioning. The TMK042CG4R4BD-W is supplied in Cut Tape (CT) packaging rather than Tape & Reel (TR), which may affect procurement and assembly workflows. This option is suitable for applications requiring tighter capacitance tolerance within existing designs.

MLAST042SCG4R4CWNA01 (Parametric Equivalent - Medical/Non-Critical): This part is electrically and mechanically equivalent to the main part with Active product status, indicating ongoing manufacturer support. The MLAS series designation indicates medical-grade qualification. It maintains ±0.25 pF tolerance matching the original specification. This part is appropriate for new designs or redesigns requiring medical-grade component certification while maintaining identical electrical performance.

MSAST042SCG4R4CWNA01 (Parametric Equivalent - General Purpose): This part is electrically and mechanically equivalent to the main part with Active product status. The MSAS series designation indicates general-purpose application suitability. It maintains ±0.25 pF tolerance matching the original specification. This part is appropriate for new designs or redesigns in general-purpose applications requiring an active, supported alternative to the legacy TMK042CG4R4CD-W.

All substitute parts are ROHS3 compliant with MSL 1 moisture sensitivity rating, ensuring compatibility with standard manufacturing and storage protocols.

Frequently Asked Questions (FAQ)

Q: Can TMK042CG4R4BD-W be used as a direct replacement for TMK042CG4R4CD-W?

A: Yes. Both parts are electrically and mechanically identical with respect to capacitance (4.4 pF), voltage rating (25V), temperature coefficient (C0G/NP0), operating temperature range (-55°C to 125°C), and package form factor (01005/0402 Metric). The primary difference is packaging format (Cut Tape versus Tape & Reel) and tolerance specification (±0.1 pF versus ±0.25 pF). The tighter tolerance of TMK042CG4R4BD-W provides improved performance in applications sensitive to capacitance variation.

Q: What is the difference between MLAST042SCG4R4CWNA01 and MSAST042SCG4R4CWNA01?

A: Both parts are parametric equivalents with identical electrical and mechanical specifications. The primary differences are series designation (MLAS versus MSAS) and intended application scope. MLAST042SCG4R4CWNA01 carries medical-grade qualification suitable for medical and non-critical applications. MSAST042SCG4R4CWNA01 is designated for general-purpose applications. Both maintain Active product status, ensuring long-term availability and manufacturer support.

Q: Are all substitute parts compatible with the original PCB layout and assembly process?

A: Yes. All substitute parts share identical physical dimensions (0.016" L x 0.008" W, 0.009" max thickness) and 01005 (0402 Metric) package specifications. Surface-mount assembly processes and PCB footprints are fully compatible. Packaging format differences (Tape & Reel versus Cut Tape) affect procurement and feeder compatibility but not component placement or electrical performance.

Q: What is the significance of "Not For New Designs" status on the main part?

A: This designation indicates that TMK042CG4R4CD-W is a legacy component no longer recommended for new product development. Existing designs using this part remain supported, but new designs should transition to active alternatives such as MLAST042SCG4R4CWNA01 or MSAST042SCG4R4CWNA01 to ensure long-term supply chain stability and manufacturer support.

Q: Are all parts RoHS3 compliant?

A: Yes. TMK042CG4R4CD-W, TMK042CG4R4BD-W, MLAST042SCG4R4CWNA01, and MSAST042SCG4R4CWNA01 are all ROHS3 compliant, meeting regulatory requirements for restricted hazardous substances in electronic components.

Q: What does MSL 1 (Unlimited) moisture sensitivity rating mean?

A: MSL 1 indicates the lowest moisture sensitivity level. Components with this rating have unlimited shelf life under standard storage conditions and do not require special moisture-control handling during manufacturing or storage. All substitute parts carry this rating, ensuring compatibility with standard assembly and logistics protocols.

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