1.5SMC400A-M3/9AT Equivalent & Substitute Parts

Part Overview

The 1.5SMC400A-M3/9AT is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This component operates in the 1.5SMC TransZorb® series and is designed for general-purpose transient voltage suppression applications. The part is currently in active product status with RoHS3 compliance and unlimited moisture sensitivity level (MSL 1). Finding equivalent substitute parts is necessary to ensure design flexibility, optimize supply chain availability, and maintain component interchangeability across manufacturing batches.

Substiute Parts

1.5SMC400A-M3/9AT

Vishay General Semiconductor - Diodes DivisionIn Stock: 9541.5SMC400A-M3/9AT Datasheet

Current PartRFQ

1.5SMC400A

Littelfuse Inc.In Stock: 277521.5SMC400A Datasheet

MFR RecommendedRFQ

1.5SMC400A

Littelfuse Inc.In Stock: 277521.5SMC400A Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 1.5SMC400A-M3/9AT is determined by strict alignment of the following electrical and mechanical parameters:

Critical Matching Parameters:

• Voltage - Reverse Standoff (Typ): 342V
• Voltage - Breakdown (Min): 380V
• Voltage - Clamping (Max) @ Ipp: 548V
• Current - Peak Pulse (10/1000µs): 2.7A or higher
• Power - Peak Pulse: 1500W (1.5kW)
• Package / Case: DO-214AB, SMC
• Unidirectional Channels: 1
• Type: Zener

The 1.5SMC400A manufactured by Littelfuse Inc. meets all critical electrical parameters and maintains identical package specifications. The peak pulse current specification of 2.8A in the Littelfuse variant exceeds the minimum requirement of 2.7A, providing equivalent or superior performance within the same thermal and voltage envelope.

Parameter Comparison

Engineering Selection Recommendations

Both the Vishay 1.5SMC400A-M3/9AT and Littelfuse 1.5SMC400A are active products with ROHS3 compliance and REACH unaffected status. The Littelfuse variant is suitable as a direct substitute based on electrical parameter equivalence and identical package specifications. The Littelfuse part demonstrates higher peak pulse current capability (2.8A versus 2.7A), which provides additional margin within the same power dissipation envelope. Both components maintain the same voltage suppression characteristics and thermal operating range upper limit of 150°C. The Littelfuse variant operates at a minimum temperature of -55°C compared to -65°C for the Vishay part; this difference is application-dependent and should be evaluated against specific circuit requirements.

Frequently Asked Questions (FAQ)

Q: Can the Littelfuse 1.5SMC400A replace the Vishay 1.5SMC400A-M3/9AT in existing designs?

A: Yes. Both parts share identical electrical specifications for reverse standoff voltage (342V), breakdown voltage (380V), clamping voltage (548V), and power dissipation (1500W). The Littelfuse variant provides equal or superior peak pulse current performance (2.8A versus 2.7A). Package specifications (DO-214AB, SMC) and mounting type (surface mount) are identical.

Q: What is the significance of the higher peak pulse current in the Littelfuse part?

A: The Littelfuse 1.5SMC400A specifies 2.8A peak pulse current compared to 2.7A for the Vishay part. This represents a 3.7% increase in current handling capability within the same 1500W power envelope, providing additional design margin without requiring circuit modifications.

Q: Are there temperature range differences between these parts?

A: The Vishay part operates from -65°C to 150°C, while the Littelfuse part operates from -55°C to 150°C. The upper temperature limit is identical. The lower temperature difference should be evaluated based on specific application requirements. Both parts maintain the same maximum junction temperature rating of 150°C.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the Vishay 1.5SMC400A-M3/9AT and Littelfuse 1.5SMC400A are ROHS3 compliant, REACH unaffected, and carry MSL 1 (unlimited) moisture sensitivity level ratings. Both are active products with no planned obsolescence.

Q: Are packaging and tape specifications identical?

A: Both parts use the DO-214AB (SMCJ) surface mount package. The Vishay part is supplied in Tape & Reel (TR) format, while the Littelfuse part is available in Cut Tape (CT) and Digi-Reel® formats. The physical component package is identical; packaging format selection depends on procurement and assembly requirements.