TMK042CG040BD-W Equivalent & Substitute Parts

Part Overview

The TMK042CG040BD-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 designed for surface mount applications. The part carries a "Not For New Designs" product status, indicating that alternative solutions should be evaluated for new circuit implementations. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain flexibility, and support legacy system maintenance.

Key Parameters

Parameter	Value
Capacitance	4 pF
Tolerance	±0.1pF
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)
Moisture Sensitivity Level (MSL)	1 (Unlimited)
RoHS Status	ROHS3 Compliant
REACH Status	REACH Unaffected

Substitute Part Grouping Explanation

Substitution of the TMK042CG040BD-W is determined by strict equivalence across the following critical parameters:

Electrical Parameters:

Capacitance value: 4 pF
Tolerance: ±0.1pF
Voltage rating: 25V
Temperature coefficient: C0G/NP0

Mechanical Parameters:

Package type: 01005 (0402 Metric)
Mounting type: Surface Mount, MLCC
Physical dimensions: 0.016" L x 0.008" W (0.40mm x 0.20mm)
Maximum thickness: 0.009" (0.22mm)

Compliance Parameters:

RoHS3 compliance
REACH unaffected status
Moisture sensitivity level: 1 (Unlimited)

All substitute parts listed maintain identical electrical specifications and mechanical form factors. Differences exist only in packaging configuration (Cut Tape versus Tape & Reel), manufacturer series designation, and product lifecycle status.

Parameter Comparison

Parameter	TMK042CG040BD-W	MLAST042SCG040BWNA01	MSAST042SCG040BWNA01	KGM02ACG1E4R0BH
Manufacturer	Taiyo Yuden	Taiyo Yuden	Taiyo Yuden	KYOCERA AVX
Capacitance	4 pF	4 pF	4 pF	4 pF
Tolerance	±0.1pF	±0.1pF	±0.1pF	±0.1pF
Voltage - Rated	25V	25V	25V	25V
Temperature Coefficient	C0G, NP0	C0G, NP0	C0G, NP0	C0G, NP0
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 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
Size / Dimension	0.016" L x 0.008" W (0.40mm x 0.20mm)	0.016" L x 0.008" W (0.40mm x 0.20mm)	0.016" L x 0.008" W (0.40mm x 0.20mm)	0.016" L x 0.008" W (0.40mm x 0.20mm)
Thickness (Max)	0.009" (0.22mm)	0.009" (0.22mm)	0.009" (0.22mm)	0.009" (0.22mm)
Packaging	Cut Tape (CT)	Tape & Reel (TR)	Tape & Reel (TR)	Tape & Reel (TR)
Product Status	Not For New Designs	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

For Legacy System Support: The TMK042CG040BD-W remains suitable for maintenance and repair of existing designs. The part is available in inventory (71,856 pcs) and maintains full ROHS3 and REACH compliance.

For New Design Implementation: All three substitute parts carry "Active" product status and are recommended for new circuit designs:

MLAST042SCG040BWNA01 (Taiyo Yuden MLAS series): Active status with 847 pcs inventory. Designated for medical and non-critical applications.
MSAST042SCG040BWNA01 (Taiyo Yuden MSAS series): Active status with 766 pcs inventory. Designated for general purpose applications.
KGM02ACG1E4R0BH (KYOCERA AVX KGM series): Active status with 4,819 pcs inventory. Designated for general purpose applications.

All substitute parts are electrically and mechanically identical to the main part. Selection between substitutes should be based on packaging requirements (Tape & Reel format), application classification, and supply chain availability.

Frequently Asked Questions (FAQ)

Q: Can MLAST042SCG040BWNA01, MSAST042SCG040BWNA01, or KGM02ACG1E4R0BH be used as direct replacements for TMK042CG040BD-W?

A: Yes. All three parts are parametric equivalents with identical electrical specifications (4 pF, ±0.1pF, 25V, C0G/NP0) and mechanical form factors (01005/0402 Metric). The primary difference is packaging configuration: the main part is supplied in Cut Tape format, while substitutes are supplied in Tape & Reel format.

Q: What is the significance of the "Not For New Designs" status on TMK042CG040BD-W?

A: This designation indicates the part is in mature or end-of-life phase. While the part remains available and functional, Taiyo Yuden recommends using active-status alternatives for new circuit designs. All three substitute parts carry "Active" status.

Q: Are there differences in application suitability between the substitute parts?

A: MLAST042SCG040BWNA01 is designated for medical and non-critical applications. MSAST042SCG040BWNA01 and KGM02ACG1E4R0BH are designated for general purpose applications. Electrical and mechanical performance is identical across all parts.

Q: Does packaging format (Cut Tape versus Tape & Reel) affect electrical performance?

A: No. Packaging format affects only handling, storage, and assembly logistics. Electrical and mechanical specifications remain identical regardless of packaging configuration.

Q: Are all substitute parts RoHS3 and REACH compliant?

A: Yes. All parts listed—the main part and all substitutes—are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Q: What is the Moisture Sensitivity Level (MSL) for these parts?

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

Q: Which substitute part has the highest inventory availability?

A: KGM02ACG1E4R0BH (KYOCERA AVX) has the highest inventory with 4,819 pcs available, followed by MLAST042SCG040BWNA01 with 847 pcs and MSAST042SCG040BWNA01 with 766 pcs.

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