RFCS04024000DBTWS Equivalent & Substitute Parts

Part Overview

The RFCS04024000DBTWS is a 0.4 pF silicon capacitor manufactured by Vishay Electro-Films, rated for 50 V operation in a 0402 (1005 Metric) surface mount package. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing design support and production continuity. The silicon capacitor technology and ultra-low capacitance value position this part for precision RF and high-frequency applications requiring minimal parasitic effects.

Substiute Parts

RFCS04024000DBTWS

Vishay Electro-FilmsIn Stock: 790RFCS04024000DBTWS Datasheet

Current PartRFQ

04021J0R4ZBSTR

KYOCERA AVXIn Stock: 472704021J0R4ZBSTR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the RFCS04024000DBTWS is determined by the following critical parameters:

Capacitance Value: The substitute must maintain 0.4 pF capacitance to preserve circuit performance in RF tuning and impedance matching applications.

Package Compatibility: The 0402 (1005 Metric) surface mount package is mandatory for PCB layout compatibility and automated assembly processes.

Operating Temperature Range: The substitute must support the full -55°C ~ 125°C operating range to ensure reliability across specified environmental conditions.

Voltage Rating: The substitute voltage rating must equal or exceed the original 50 V breakdown specification. Higher voltage ratings provide additional design margin.

RoHS Compliance: ROHS3 compliance is required to meet current regulatory and procurement standards.

Moisture Sensitivity: MSL 1 classification ensures compatibility with standard storage and handling procedures.

The identified substitute, 04021J0R4ZBSTR from KYOCERA AVX, meets all these critical parameters while offering improved tolerance and active product status.

Parameter Comparison

Engineering Selection Recommendations

The 04021J0R4ZBSTR substitute is qualified for direct replacement based on the following factors:

Electrical Equivalence: Both parts maintain identical 0.4 pF capacitance and support the full -55°C ~ 125°C operating temperature range. The substitute's 100 V rated voltage exceeds the original 50 V specification, providing additional voltage margin.

Package Compatibility: Both components use the 0402 (1005 Metric) surface mount package, ensuring PCB layout and assembly process compatibility without modification.

Regulatory Compliance: Both parts are ROHS3 compliant and carry MSL 1 classification, meeting current procurement and environmental standards.

Product Availability: The substitute is classified as active product status with confirmed inventory availability, ensuring long-term supply continuity compared to the obsolete original part.

Tolerance Improvement: The substitute offers ±0.01 pF tolerance compared to the original ±0.1 pF, providing tighter capacitance control for precision RF applications.

Frequently Asked Questions (FAQ)

Q: Can the 04021J0R4ZBSTR directly replace the RFCS04024000DBTWS without circuit modification?

A: Yes. Both parts share identical capacitance (0.4 pF), package (0402), and operating temperature range (-55°C ~ 125°C). The substitute's higher voltage rating (100 V vs. 50 V) and improved tolerance do not require circuit changes.

Q: What is the difference between silicon and thin film capacitor technology in this application?

A: The original uses silicon capacitor technology; the substitute uses thin film technology. Both achieve the specified 0.4 pF capacitance and are suitable for RF applications. The thin film substitute offers superior tolerance and active product status.

Q: Are there any packaging or mounting differences between these parts?

A: No. Both components use the 0402 (1005 Metric) surface mount package with identical footprints and mounting procedures. The substitute is supplied in Tape & Reel (TR) packaging, standard for automated assembly.

Q: Does the higher voltage rating of the substitute affect circuit performance?

A: No. Higher voltage rating provides additional design margin without affecting capacitance value or frequency response. This is a beneficial characteristic for reliability.

Q: Are both parts RoHS compliant?

A: Yes. Both the RFCS04024000DBTWS and 04021J0R4ZBSTR are ROHS3 compliant and carry MSL 1 classification, meeting current regulatory requirements.

Q: Why is the original part obsolete?

A: The RFCS04024000DBTWS is classified as obsolete by the manufacturer. The 04021J0R4ZBSTR from KYOCERA AVX is an active product with confirmed inventory, providing design continuity and supply security.