1N6543 Equivalent & Substitute Parts

Part Overview

The 1N6543 is an ultrafast recovery rectifier diode manufactured by Microchip Technology, classified as a general-purpose rectifier in the Diodes, Rectifiers category. This component is supplied in bulk packaging and maintains Active product status. The 1N6543 is RoHS non-compliant and carries Moisture Sensitivity Level 1 (Unlimited), indicating no moisture sensitivity constraints during storage and handling.

Equivalent and substitute parts are necessary when the primary component becomes unavailable, when procurement lead times require alternative sourcing, or when design flexibility permits selection from multiple qualified manufacturers offering compatible electrical and mechanical characteristics.

Substiute Parts

1N6543

Microchip TechnologyIn Stock: 11181N6543 Datasheet

Current PartRFQ

1N5404-E3/54

Vishay General Semiconductor - Diodes DivisionIn Stock: 17431N5404-E3/54 Datasheet

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1N5404-G

Comchip TechnologyIn Stock: 2089711N5404-G Datasheet

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EGP30G

onsemiIn Stock: 6047EGP30G Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the 1N6543 is determined by electrical compatibility within the rectifier diode classification. The substitute parts identified—1N5404-G, 1N5404-E3/54, and EGP30G—share the following critical parameters that establish substitutability:

Electrical Compatibility Criteria:

• Voltage - DC Reverse (Vr) (Max): 400 V
• Current - Average Rectified (Io): 3 A
• Current - Reverse Leakage @ Vr: 5 µA @ 400 V
• Mounting Type: Through Hole
• Package / Case: DO-201AD, Axial

Regulatory and Compliance Alignment:

• ECCN Classification: EAR99
• HTSUS Code: 8541.10.0080
• REACH Status: REACH Unaffected

All substitute parts operate within the same voltage and current ratings, utilize identical through-hole axial packaging, and maintain equivalent regulatory classifications. Differences in forward voltage, recovery speed, and operating temperature ranges are noted in the parameter comparison table below.

Parameter Comparison

Engineering Selection Recommendations

1N5404-E3/54 (Vishay General Semiconductor - Diodes Division)

This substitute is suitable for applications requiring standard recovery characteristics. The part maintains Active product status and achieves ROHS3 compliance. Operating temperature range extends to 150°C maximum junction temperature. Forward voltage specification of 1.2 V @ 3 A is within typical rectifier parameters. Cut Tape packaging provides standard component handling and assembly compatibility.

1N5404-G (Comchip Technology)

This substitute offers the lowest forward voltage specification at 950 mV @ 3 A, resulting in reduced power dissipation in rectification circuits. The part maintains Active product status and ROHS3 compliance. Moisture Sensitivity Level 1 (Unlimited) matches the main part specification. Operating temperature range of -65°C to 125°C accommodates standard industrial applications. Cut Tape packaging supports standard manufacturing processes.

EGP30G (onsemi)

This substitute features fast recovery characteristics with reverse recovery time of 50 ns, supporting higher-frequency switching applications. The part carries "Not For New Designs" product status, indicating onsemi has transitioned this component to legacy classification. ROHS3 compliance is maintained. Operating temperature range extends to 150°C maximum junction temperature. Fast recovery speed differentiates this option for applications requiring reduced switching losses. Cut Tape packaging is standard.

Compliance Considerations:

All substitute parts maintain EAR99 ECCN classification and REACH Unaffected status, ensuring regulatory alignment with the main part. The 1N5404-E3/54 and 1N5404-G achieve ROHS3 compliance, whereas the main part 1N6543 is RoHS non-compliant. Selection between ROHS3-compliant substitutes and the non-compliant main part depends on end-product regulatory requirements and customer specifications.

Frequently Asked Questions (FAQ)

Q: What electrical parameters determine whether a diode can substitute for the 1N6543?

A: The primary electrical parameters are Voltage - DC Reverse (Vr) Maximum of 400 V and Current - Average Rectified (Io) of 3 A. All substitute parts meet these specifications. Secondary parameters including forward voltage, reverse leakage current, and recovery speed may vary but do not prevent substitution within the rectifier classification.

Q: Are the substitute parts physically compatible with the 1N6543?

A: The 1N6543 is specified with A-PKG packaging. The substitute parts utilize DO-201AD axial packaging. Both are through-hole mounting types suitable for axial component placement. Physical compatibility depends on PCB layout and component footprint design. Verification of mechanical fit is required during design integration.

Q: What is the significance of the "Not For New Designs" status on the EGP30G?

A: This designation indicates that onsemi has classified the EGP30G as a legacy component and recommends against its use in new product development. Existing designs currently utilizing this part may continue procurement, but new applications should select from parts with Active product status: 1N5404-E3/54 or 1N5404-G.

Q: How do the recovery speed differences affect circuit performance?

A: The 1N6543 is specified as ultrafast recovery. The 1N5404-E3/54 and 1N5404-G are standard recovery (>500 ns). The EGP30G is fast recovery (≤500 ns) with 50 ns reverse recovery time. Ultrafast and fast recovery diodes reduce switching losses in high-frequency applications. Standard recovery diodes are suitable for lower-frequency rectification. Circuit operating frequency determines whether recovery speed differences are functionally significant.

Q: What is the impact of RoHS compliance differences?

A: The main part 1N6543 is RoHS non-compliant. All substitute parts (1N5404-E3/54, 1N5404-G, EGP30G) are ROHS3 compliant. RoHS compliance restricts hazardous substances in electrical and electronic equipment. Selection of ROHS3-compliant substitutes is mandatory for products subject to RoHS regulations. Non-compliant parts are restricted in regulated markets.

Q: Can forward voltage differences impact circuit design?

A: Forward voltage specifications vary: 1N5404-E3/54 at 1.2 V, 1N5404-G at 950 mV, and EGP30G at 1.25 V. These differences affect power dissipation and voltage drop across the diode during conduction. The 1N5404-G exhibits the lowest forward voltage, reducing heat generation. Circuit designs with tight voltage budgets or high-current applications should account for these variations during thermal and electrical analysis.

Q: Are all substitute parts available in equivalent packaging formats?

A: All substitute parts are supplied in Cut Tape (CT) packaging. The main part 1N6543 is supplied in Bulk packaging. Cut Tape packaging is standard for component distribution and automated assembly. Bulk packaging typically requires manual handling and counting. Procurement and assembly processes must accommodate the packaging format differences.