CBR04C309C5GAC Equivalent & Substitute Parts

Part Overview

The CBR04C309C5GAC is a 3 pF ceramic capacitor manufactured by KEMET, rated for 50V operation with C0G/NP0 temperature coefficient characteristics. This surface-mount multilayer ceramic capacitor (MLCC) is designed for RF, microwave, and high-frequency applications requiring high Q factor and ultra-low ESR performance. The part is currently active in production with full RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1). Equivalent and substitute parts are identified to support design flexibility, inventory optimization, and supply chain continuity for applications requiring identical or enhanced electrical specifications within the 0402 (1005 Metric) package format.

Substiute Parts

CBR04C309C5GAC

KEMETIn Stock: 1218CBR04C309C5GAC Datasheet

Current PartRFQ

CBR04C309B1GAC

KEMETIn Stock: 101140CBR04C309B1GAC Datasheet

UpgradeRFQ

CBR04C309B5GAC

KEMETIn Stock: 87580CBR04C309B5GAC Datasheet

UpgradeRFQ

GJM1555C1H3R0CB01D

Murata ElectronicsIn Stock: 33938GJM1555C1H3R0CB01D Datasheet

DirectRFQ

GJM1555C1H3R0CB01J

Murata ElectronicsIn Stock: 78619GJM1555C1H3R0CB01J Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the CBR04C309C5GAC is determined by strict alignment of the following critical parameters:

Mandatory Matching Parameters:

• Capacitance: 3 pF (exact match required)
• Temperature Coefficient: C0G/NP0 (exact match required)
• Package / Case: 0402 (1005 Metric) (exact match required)
• Mounting Type: Surface Mount, MLCC (exact match required)
• Operating Temperature Range: -55°C ~ 125°C (exact match required)
• Physical Dimensions: 0.039" L x 0.020" W; Thickness 0.022" max (exact match required)

Allowable Variation Parameters:

• Voltage Rating: Equal to or greater than 50V
• Tolerance: Equal to or tighter than ±0.25pF
• Manufacturer: Different manufacturers permitted if all mandatory parameters align

Substitute parts are classified into two categories:

Upgrade Substitutes (KEMET CBR-SMD RF C0G Series): Parts with identical capacitance, package, and temperature coefficient but with improved tolerance specifications (±0.1pF) or higher voltage ratings (100V). These parts provide enhanced performance margins while maintaining full mechanical and electrical compatibility.

Direct Substitutes (Murata GJM Series): Parts from alternative manufacturers with identical electrical specifications and package dimensions, providing cross-manufacturer compatibility for supply chain flexibility.

Parameter Comparison

Engineering Selection Recommendations

All identified substitute parts maintain active production status and full RoHS3 compliance, ensuring regulatory alignment and long-term supply availability. Selection between substitute options is determined by application-specific requirements:

CBR04C309B5GAC Selection: This KEMET upgrade substitute provides tighter tolerance specification (±0.1pF versus ±0.25pF) while maintaining the original 50V voltage rating and identical package footprint. This part is suitable for applications requiring improved capacitance stability and reduced tolerance stack-up in RF tuning circuits or precision frequency-dependent networks.

CBR04C309B1GAC Selection: This KEMET upgrade substitute doubles the voltage rating to 100V while providing tighter tolerance (±0.1pF). This part is suitable for applications where higher voltage margin is required or where the same component must function across multiple voltage domains within a system.

GJM1555C1H3R0CB01D and GJM1555C1H3R0CB01J Selection: These Murata direct substitutes provide cross-manufacturer compatibility with identical electrical specifications and package dimensions to the main part. Both parts maintain ±0.25pF tolerance and 50V rating. Selection between these Murata variants is determined by internal manufacturing or supply chain preferences, as electrical and mechanical specifications are equivalent.

All substitute parts are suitable for RF, microwave, and high-frequency applications with high Q factor and low-loss performance characteristics. Mechanical compatibility is confirmed across all options, with identical 0402 (1005 Metric) package dimensions and surface-mount mounting type.

Frequently Asked Questions (FAQ)

Q: Can CBR04C309B5GAC be used as a direct replacement for CBR04C309C5GAC?

A: Yes. CBR04C309B5GAC is a direct mechanical and electrical substitute with identical capacitance (3 pF), voltage rating (50V), temperature coefficient (C0G/NP0), and package dimensions (0402). The primary difference is improved tolerance specification (±0.1pF versus ±0.25pF), which provides enhanced performance without any compatibility concerns.

Q: What is the advantage of CBR04C309B1GAC over the original part?

A: CBR04C309B1GAC provides two enhancements: tighter tolerance (±0.1pF) and doubled voltage rating (100V). The 100V rating provides additional safety margin in applications subject to voltage transients or where the component must operate across multiple voltage domains. The tighter tolerance reduces capacitance variation across the operating temperature range.

Q: Are Murata GJM parts fully compatible with KEMET CBR parts?

A: Yes. GJM1555C1H3R0CB01D and GJM1555C1H3R0CB01J are fully compatible with CBR04C309C5GAC. All parts share identical capacitance (3 pF), voltage rating (50V), tolerance (±0.25pF), temperature coefficient (C0G/NP0), operating temperature range (-55°C ~ 125°C), and package dimensions (0402 / 1005 Metric). Cross-manufacturer substitution is supported for supply chain flexibility.

Q: Does package footprint differ between KEMET and Murata parts?

A: No. All parts use the 0402 (1005 Metric) package with identical physical dimensions: 0.039" L x 0.020" W (1.00mm x 0.50mm) and maximum thickness of 0.022" (0.55mm). PCB layout and assembly processes require no modification.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed (CBR04C309B5GAC, CBR04C309B1GAC, GJM1555C1H3R0CB01D, and GJM1555C1H3R0CB01J) are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, matching the compliance profile of the original CBR04C309C5GAC.

Q: Which substitute should be selected for high-frequency RF applications?

A: All substitute parts are suitable for RF, microwave, and high-frequency applications. Selection is based on specific circuit requirements: use CBR04C309B5GAC or CBR04C309B1GAC for improved tolerance stability in precision tuning networks; use GJM1555C1H3R0CB01D or GJM1555C1H3R0CB01J for cross-manufacturer sourcing flexibility. All parts provide high Q factor and ultra-low ESR performance.

Q: Can CBR04C309B1GAC be used in a 50V circuit?

A: Yes. CBR04C309B1GAC is rated for 100V operation, which exceeds the 50V requirement. Higher voltage rating does not create compatibility issues; the part operates safely at any voltage up to its rated maximum. This provides additional design margin for transient protection.