SGC3S300 Trimmer Capacitor Equivalent & Substitute Parts

Part Overview

The SGC3S300 is an 8–30pF ceramic trimmer capacitor rated for 500V operation in a top-adjustment surface mount configuration. Manufactured by Sprague-Goodman, this component is classified as obsolete. Due to its discontinued status, equivalent and substitute parts from active manufacturers are necessary for ongoing production, maintenance, and design continuity. The SGC3S300 series has been superseded by compatible alternatives that maintain functional equivalence within specified electrical and mechanical parameters.

Substiute Parts

SGC3S300

Sprague-GoodmanIn Stock: 1112SGC3S300 Datasheet

Current PartRFQ

JZ300

Knowles VoltronicsIn Stock: 43450JZ300 Datasheet

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JZ300HV

Knowles VoltronicsIn Stock: 49430JZ300HV Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the SGC3S300 is determined by the following critical parameters:

Electrical Compatibility:

• Capacitance range overlap: The SGC3S300 operates 8–30pF. Substitute parts must support the full 8–30pF range or encompass it within their specified range.
• Voltage rating: The SGC3S300 is rated 500V. Substitutes must meet or exceed this voltage requirement for direct replacement in the same circuit.
• Dielectric material: Ceramic dielectric is required for functional equivalence.

Mechanical Compatibility:

• Adjustment type: Top-adjustment configuration is mandatory.
• Mounting type: Surface mount (SMD) is required.
• Physical footprint: Dimensions 4.50mm × 3.20mm must be maintained for PCB layout compatibility.
• Height: Seated height must not exceed 1.50mm to ensure clearance in existing designs.

Environmental & Compliance:

• Operating temperature: −40°C to +85°C range must be supported.
• RoHS compliance is required.
• MSL rating of 1 is acceptable.

The substitute parts listed below satisfy these criteria within their respective voltage and performance specifications.

Parameter Comparison

Engineering Selection Recommendations

JZ300HV (Knowles Voltronics) – Primary Substitute:

The JZ300HV is the preferred substitute for the SGC3S300. It maintains identical physical dimensions (4.50mm × 3.20mm) and footprint compatibility. The JZ300HV is rated 350V, which is lower than the SGC3S300's 500V rating. This part is suitable for applications where the circuit voltage does not exceed 350V. The JZ300HV is an active product with full RoHS compliance and unlimited moisture sensitivity rating. Its capacitance range of 5.5–30pF encompasses the SGC3S300's 8–30pF range. The higher Q factor (1500 @ 1MHz) compared to the SGC3S300 (500 @ 1MHz) indicates superior performance characteristics in high-frequency applications.

JZ300 (Knowles Voltronics) – Secondary Substitute:

The JZ300 is an alternative substitute for applications with lower voltage requirements. It is rated 125V and is therefore suitable only for circuits operating at or below 125V. The JZ300 shares identical physical dimensions and footprint with the SGC3S300. It is an active product with full RoHS compliance. The capacitance range of 5.5–30pF is compatible with the SGC3S300's range. The lower Q factor (200 @ 1MHz) indicates reduced performance in high-frequency applications compared to both the SGC3S300 and JZ300HV.

Selection Criteria:

• For applications requiring 500V operation: The SGC3S300 cannot be directly replaced. Redesign or voltage derating is necessary.
• For applications operating at 350V or below: Use JZ300HV.
• For applications operating at 125V or below: Use JZ300.
• Both substitutes are active products with established supply chains and full compliance certifications.

Frequently Asked Questions (FAQ)

Q: Can the JZ300HV directly replace the SGC3S300 in a 500V circuit?

A: No. The JZ300HV is rated 350V maximum. Using it in a 500V circuit exceeds its voltage rating and will result in component failure. The circuit must operate at 350V or below for the JZ300HV to be suitable.

Q: What is the difference between JZ300 and JZ300HV?

A: The primary difference is voltage rating. The JZ300HV is rated 350V, while the JZ300 is rated 125V. Both share identical physical dimensions, capacitance range (5.5–30pF), and mounting type. The JZ300HV has a significantly higher Q factor (1500 vs. 200 @ 1MHz), making it superior for high-frequency applications.

Q: Are the physical dimensions identical between all three parts?

A: Yes. The SGC3S300, JZ300HV, and JZ300 all have identical footprints of 4.50mm × 3.20mm and seated heights of 1.50mm (SGC3S300) or 1.45mm (JZ300HV and JZ300). They are mechanically interchangeable on the PCB.

Q: What does the capacitance range difference mean?

A: The SGC3S300 has a minimum capacitance of 8pF, while both Knowles Voltronics substitutes have a minimum of 5.5pF. This means the substitutes can achieve lower capacitance values. If your circuit requires exactly 8pF minimum, the substitutes will function at 5.5pF minimum, which may affect circuit tuning. Verify that the lower minimum capacitance does not impact circuit performance.

Q: Are both substitutes RoHS compliant?

A: Yes. Both the JZ300HV and JZ300 are RoHS compliant with MSL 1 (Unlimited) moisture sensitivity rating, matching the SGC3S300's compliance status.

Q: What packaging options are available?

A: The SGC3S300 is supplied in Tape & Reel (TR). The JZ300HV is also supplied in Tape & Reel (TR). The JZ300 is available in Cut Tape (CT) and Digi-Reel® packaging. Verify packaging compatibility with your procurement and assembly processes.

Q: Why is the Q factor different between these parts?

A: Q factor is a measure of component quality and frequency response characteristics. The JZ300HV has a Q of 1500 @ 1MHz, significantly higher than the SGC3S300 (500 @ 1MHz) and JZ300 (200 @ 1MHz). Higher Q indicates lower losses and better performance in resonant circuits and high-frequency applications. Select based on your circuit's frequency requirements.