1.5SMC480A-M3/9AT Equivalent & Substitute Parts

Part Overview

The 1.5SMC480A-M3/9AT is a unidirectional transient voltage suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This component operates in the 1.5SMC series and provides transient overvoltage protection for general-purpose applications. The device features a 408V reverse standoff voltage with 658V maximum clamping voltage and 1500W peak pulse power rating in a surface-mount DO-214AB (SMC) package. The part is currently active in production with ROHS3 compliance and unlimited moisture sensitivity level (MSL 1).

Equivalent and substitute parts are necessary when the primary manufacturer part becomes unavailable, when supply chain optimization is required, or when alternative qualified sources are needed to maintain design flexibility and production continuity.

Substiute Parts

1.5SMC480A-M3/9AT

Vishay General Semiconductor - Diodes DivisionIn Stock: 10771.5SMC480A-M3/9AT Datasheet

Current PartRFQ

1.5SMC480A

Littelfuse Inc.In Stock: 303281.5SMC480A Datasheet

MFR RecommendedRFQ

1.5SMC480A

Littelfuse Inc.In Stock: 303281.5SMC480A Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 1.5SMC480A-M3/9AT is determined by strict equivalence across the following critical parameters:

• Voltage Rating: Reverse standoff voltage of 408V (typical), breakdown voltage minimum of 456V, and clamping voltage maximum of 658V at peak pulse current
• Current Rating: Peak pulse current of 2.28A or higher at 10/1000µs pulse duration
• Power Dissipation: Peak pulse power rating of 1500W (1.5kW)
• Device Type: Unidirectional Zener TVS diode with single channel configuration
• Package: DO-214AB (SMC) surface-mount package
• Compliance: ROHS3 compliance and MSL 1 rating

Substitute parts must maintain electrical equivalence across all voltage and current parameters while preserving the same physical package and mounting characteristics. Operating temperature range variations are acceptable provided the substitute meets or exceeds the specified range.

Parameter Comparison

Engineering Selection Recommendations

The Littelfuse 1.5SMC480A is a qualified substitute for the Vishay 1.5SMC480A-M3/9AT based on the following engineering criteria:

Electrical Equivalence: Both parts maintain identical voltage ratings (408V standoff, 456V breakdown minimum, 658V clamping maximum) and equivalent peak pulse current specifications (2.28A vs. 2.3A). The 0.02A difference in peak pulse current is within acceptable tolerance for TVS diode applications and does not affect circuit protection performance.

Package and Mounting Compatibility: Both devices use the DO-214AB (SMC) surface-mount package, ensuring direct PCB footprint compatibility without layout modifications.

Compliance and Certification: Both parts are ROHS3 compliant with MSL 1 rating and active product status, meeting current regulatory and supply chain requirements.

Operating Temperature: The Littelfuse substitute operates across -55°C to 150°C, which covers the upper portion of the Vishay part's -65°C to 150°C range. For applications requiring the full -65°C lower temperature limit, the Vishay part must be retained.

Frequently Asked Questions (FAQ)

Q: Can the Littelfuse 1.5SMC480A directly replace the Vishay 1.5SMC480A-M3/9AT without circuit modifications?

A: Yes. Both parts are electrically equivalent with identical voltage ratings and compatible peak pulse current specifications. The DO-214AB package footprint is identical, requiring no PCB layout changes.

Q: What is the significance of the 0.02A difference in peak pulse current (2.28A vs. 2.3A)?

A: This difference is negligible for TVS diode applications. Both ratings exceed the minimum current requirement for the 1.5SMC series at the specified voltage levels. Circuit protection performance remains equivalent.

Q: Are there temperature range limitations when substituting the Littelfuse part?

A: The Littelfuse substitute operates from -55°C to 150°C, compared to the Vishay part's -65°C to 150°C range. If your application requires operation below -55°C, the Vishay part must be used. For standard industrial and commercial temperature ranges, the Littelfuse part is fully qualified.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the Vishay 1.5SMC480A-M3/9AT and Littelfuse 1.5SMC480A are ROHS3 compliant with MSL 1 (unlimited) moisture sensitivity level. Both parts are active in production and meet current regulatory requirements.

Q: Is there any difference in packaging or tape-and-reel specifications?

A: Both parts are supplied in Tape & Reel (TR) packaging with DO-214AB (SMC) supplier device packages. Standard SMC reel specifications apply to both manufacturers' versions.