1N6473 Transient Voltage Suppressor Equivalent & Substitute Parts

Part Overview

The 1N6473 is an active Microchip Technology transient voltage suppressor (TVS) diode designed for general-purpose overvoltage protection applications. This unidirectional zener-type TVS diode features a 24V reverse standoff voltage with a 41.4V maximum clamping voltage and 207A peak pulse current capability in an axial through-hole package. The component is suitable for protecting sensitive electronic circuits from transient voltage spikes and surge events.

Substitute parts are identified to address application requirements including alternative packaging formats, compliance certifications, and inventory availability while maintaining functional equivalence within specified electrical parameters.

Substiute Parts

1N6473

Microchip TechnologyIn Stock: 9571N6473 Datasheet

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LCE24A

Littelfuse Inc.In Stock: 1468LCE24A Datasheet

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LCE28A

Littelfuse Inc.In Stock: 2122LCE28A Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 1N6473 are selected based on the following critical electrical and mechanical parameters:

Voltage Class Matching: Substitute parts maintain the 24V reverse standoff voltage classification to ensure equivalent circuit protection thresholds.

Clamping Voltage Compatibility: Substitute parts operate within acceptable clamping voltage ranges (38.9V to 45.5V) to provide comparable transient suppression performance.

Peak Pulse Current Capability: Substitute parts are rated for peak pulse currents ranging from 33A to 207A, with selection dependent on specific circuit surge requirements.

Power Dissipation: All substitute parts maintain the 1500W peak pulse power rating to ensure thermal performance equivalence.

Through-Hole Mounting: All substitute parts utilize through-hole mounting technology for direct PCB integration compatibility.

Operating Temperature Range: All substitute parts operate across the -55°C to 175°C temperature range for consistent performance across environmental conditions.

Zener Type Classification: All substitute parts are unidirectional zener-type TVS diodes with single-channel configuration.

Parameter Comparison

Engineering Selection Recommendations

LCE24A Selection: The LCE24A maintains identical 24V reverse standoff voltage classification with 38.9V clamping voltage and 39A peak pulse current. This substitute is suitable for applications where the 1N6473's 207A peak pulse current exceeds circuit requirements. The LCE24A carries ROHS3 compliance certification, providing environmental regulatory advantage over the non-compliant 1N6473. Package compatibility exists through DO-201 and axial format options.

LCE28A Selection: The LCE28A operates at a higher 28V reverse standoff voltage with 45.5V clamping voltage and 33A peak pulse current. This substitute is applicable only when circuit design specifications permit the elevated voltage class. The LCE28A carries ROHS3 compliance certification. Package compatibility exists through DO-201 and axial format options.

Compliance Consideration: Both Littelfuse substitutes achieve ROHS3 compliance status, whereas the 1N6473 is RoHS non-compliant. This distinction is material for applications subject to environmental regulatory requirements.

Product Status: All three parts maintain active product status, ensuring continued availability and manufacturing support.

Frequently Asked Questions (FAQ)

Q: Can the LCE24A directly replace the 1N6473 in all applications?

A: The LCE24A maintains the same 24V reverse standoff voltage and operates within compatible clamping voltage and temperature ranges. However, the LCE24A is rated for 39A peak pulse current compared to the 1N6473's 207A capability. Substitution is valid only when circuit surge current requirements do not exceed 39A.

Q: What is the primary difference between the LCE24A and LCE28A substitutes?

A: The LCE24A operates at 24V reverse standoff voltage (matching the 1N6473), while the LCE28A operates at 28V reverse standoff voltage. The LCE28A is suitable only for applications designed for the higher voltage class. Both maintain 1500W peak pulse power rating and -55°C to 175°C operating temperature range.

Q: Are there packaging differences between the 1N6473 and substitute parts?

A: The 1N6473 uses axial through-hole packaging (G package). The LCE24A and LCE28A are available in DO-201AA, DO-27, and axial formats. Axial package compatibility exists for direct board-level substitution.

Q: Does the LCE24A's lower peak pulse current rating affect protection performance?

A: Peak pulse current rating indicates the maximum transient current the device can suppress. The LCE24A's 39A rating is appropriate for circuits experiencing transient surges within this current range. Applications requiring suppression of 207A transients require the 1N6473 or equivalent high-current TVS devices.

Q: What compliance advantage do the Littelfuse substitutes provide?

A: Both LCE24A and LCE28A carry ROHS3 compliance certification, whereas the 1N6473 is RoHS non-compliant. This distinction is relevant for applications subject to environmental regulatory frameworks requiring RoHS compliance.

Q: Can the LCE28A be used in a circuit designed for 24V protection?

A: The LCE28A's 28V reverse standoff voltage is higher than the 1N6473's 24V rating. Using the LCE28A in a 24V circuit would result in delayed protection activation and is not recommended for equivalent circuit protection.

Q: Are all three parts rated for the same operating temperature range?

A: Yes. The 1N6473, LCE24A, and LCE28A all operate across the -55°C to 175°C junction temperature range, ensuring thermal performance equivalence across environmental conditions.