TMK042CG0R8CD-W Equivalent & Substitute Parts

Part Overview

The TMK042CG0R8CD-W is a 0.8 pF ceramic capacitor manufactured by Taiyo Yuden, designed for surface mount applications in the 01005 (0402 Metric) package. This component operates at 25V with C0G/NP0 temperature coefficient characteristics, suitable for general purpose applications across an operating temperature range of -55°C to 125°C.

The TMK042CG0R8CD-W carries a "Not For New Designs" product status, indicating that Taiyo Yuden has discontinued active development for this particular model. Identifying equivalent and substitute parts is necessary to support existing designs, facilitate production continuity, and enable migration to active product lines where applicable.

Key Parameters

Parameter	Value
Capacitance	0.8 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 TMK042CG0R8CD-W is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

Capacitance: 0.8 pF
Voltage Rating: 25V
Temperature Coefficient: C0G/NP0
Package: 01005 (0402 Metric)
Mounting Type: Surface Mount, MLCC
Operating Temperature Range: -55°C ~ 125°C
Physical Dimensions: 0.016" L x 0.008" W (0.40mm x 0.20mm)
Thickness: 0.009" (0.22mm) maximum

Tolerance Variations: Substitute parts may exhibit different tolerance specifications (±0.05pF, ±0.1pF, or ±0.25pF) while maintaining functional equivalence. Selection depends on circuit requirements for capacitance accuracy.

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

Product Status: Substitute parts include both "Not For New Designs" and "Active" status components. Active status parts provide extended availability and support for ongoing production requirements.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Series	Capacitance	Tolerance	Voltage	Temp Coeff	Package	Packaging Format	Product Status	Applications
TMK042CG0R8CD-W	Taiyo Yuden	M	0.8 pF	±0.25pF	25V	C0G, NP0	01005 (0402 Metric)	Tape & Reel (TR)	Not For New Designs	General Purpose
TMK042CG0R8AD-W	Taiyo Yuden	M	0.8 pF	±0.05pF	25V	C0G, NP0	01005 (0402 Metric)	Cut Tape (CT)	Not For New Designs	General Purpose
TVS042CG0R8BC-W	Taiyo Yuden	V	0.8 pF	±0.1pF	25V	C0G, NP0	01005 (0402 Metric)	Tape & Reel (TR)	Not For New Designs	RF, Microwave, High Frequency
MLAST042SCG0R8CWNA01	Taiyo Yuden	MLAS	0.8 pF	±0.25pF	25V	C0G, NP0	01005 (0402 Metric)	Tape & Reel (TR)	Active	Medical, Non-Critical
MSAST042SCG0R8CWNA01	Taiyo Yuden	MSAS	0.8 pF	±0.25pF	25V	C0G, NP0	01005 (0402 Metric)	Tape & Reel (TR)	Active	General Purpose

Engineering Selection Recommendations

For Direct Replacement (Identical Tolerance): MLAST042SCG0R8CWNA01 and MSAST042SCG0R8CWNA01 provide parametric equivalence with ±0.25pF tolerance matching the original TMK042CG0R8CD-W. Both parts carry "Active" product status, ensuring long-term availability and manufacturing support. MLAST042SCG0R8CWNA01 is qualified for medical applications, while MSAST042SCG0R8CWNA01 is designated for general purpose use.

For Improved Tolerance Performance: TMK042CG0R8AD-W offers tighter tolerance specification (±0.05pF) compared to the original part, providing enhanced capacitance accuracy for circuits requiring stricter component specifications. This part maintains "Not For New Designs" status but remains available in current inventory.

For High Frequency Applications: TVS042CG0R8BC-W, from the V series, is specified for RF, Microwave, and High Frequency applications with ±0.1pF tolerance. This part is suitable for circuits requiring frequency-dependent performance characteristics beyond general purpose applications.

Compliance Considerations: All substitute parts maintain ROHS3 compliance, MSL 1 (Unlimited) moisture sensitivity rating, and identical physical dimensions. Selection should prioritize parts with "Active" product status for new production requirements to ensure extended component availability and manufacturing continuity.

Frequently Asked Questions (FAQ)

Q: Can TMK042CG0R8AD-W replace TMK042CG0R8CD-W in existing designs?

A: Yes. TMK042CG0R8AD-W is electrically and mechanically equivalent, with identical capacitance (0.8 pF), voltage rating (25V), temperature coefficient (C0G/NP0), and package (01005). The primary difference is tighter tolerance (±0.05pF versus ±0.25pF), which provides improved capacitance accuracy without affecting circuit compatibility.

Q: What is the difference between MLAST042SCG0R8CWNA01 and MSAST042SCG0R8CWNA01?

A: Both parts are parametrically identical with 0.8 pF capacitance, ±0.25pF tolerance, 25V rating, and C0G/NP0 temperature coefficient. The primary distinction is application qualification: MLAST042SCG0R8CWNA01 is qualified for medical applications, while MSAST042SCG0R8CWNA01 is designated for general purpose use. Both carry "Active" product status.

Q: Why is TVS042CG0R8BC-W specified for RF and microwave applications?

A: TVS042CG0R8BC-W is from the V series, which is optimized for high frequency performance. While maintaining identical electrical parameters (0.8 pF, 25V, C0G/NP0), this series is engineered for RF, Microwave, and High Frequency circuit requirements. The ±0.1pF tolerance provides intermediate accuracy between general purpose and precision specifications.

Q: Are all substitute parts available in the same packaging format?

A: No. The original TMK042CG0R8CD-W is supplied in Tape & Reel (TR) format. TMK042CG0R8AD-W is available in Cut Tape (CT) format. MLAST042SCG0R8CWNA01 and MSAST042SCG0R8CWNA01 are supplied in Tape & Reel (TR) format. Packaging format does not affect electrical performance but may impact procurement and assembly processes.

Q: What does "Not For New Designs" product status mean?

A: "Not For New Designs" indicates that the manufacturer has discontinued active development and marketing for the component. While existing inventory remains available, the manufacturer does not recommend this part for new circuit designs. Parts with "Active" status (MLAST042SCG0R8CWNA01 and MSAST042SCG0R8CWNA01) are preferred for new designs to ensure long-term availability and manufacturing support.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, matching the environmental and regulatory specifications of the original TMK042CG0R8CD-W.

Q: Can tolerance differences affect circuit performance?

A: Tolerance differences (±0.25pF, ±0.1pF, ±0.05pF) define the acceptable capacitance variation range. Selection depends on circuit requirements for capacitance accuracy. Tighter tolerance parts (±0.05pF) provide improved accuracy for precision applications, while standard tolerance parts (±0.25pF) are suitable for general purpose use where capacitance variation is non-critical.

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