1.5SMC400 Equivalent & Substitute Parts

Part Overview

The 1.5SMC400 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose transient voltage protection in surface-mount applications. The device features a 342V reverse standoff voltage, 548V–575.4V clamping voltage range, and 1500W peak pulse power rating in a DO-214AB (SMC) package.

The 1.5SMC400 is classified as obsolete. Equivalent and substitute parts are available from active product lines that maintain the same electrical and mechanical specifications, ensuring continued design support and supply chain availability.

Substiute Parts

1.5SMC400

Littelfuse Inc.In Stock: 10651.5SMC400 Datasheet

Current PartRFQ

1.5SMC400A

Littelfuse Inc.In Stock: 277521.5SMC400A Datasheet

DirectRFQ

1.5SMC400A

Littelfuse Inc.In Stock: 277521.5SMC400A Datasheet

DirectRFQ

1.5SMC400AHE3_AIH

Vishay General Semiconductor - Diodes DivisionIn Stock: 8641.5SMC400AHE3_AIH Datasheet

DirectRFQ

SMCJ1.5KE400A-TP

Micro Commercial CoIn Stock: 858SMCJ1.5KE400A-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 1.5SMC400 are qualified based on the following electrical and mechanical criteria:

• Reverse standoff voltage: 342V (typical)
• Breakdown voltage range: 360V–380V (minimum)
• Clamping voltage: 548V–575.4V (maximum @ Ipp)
• Peak pulse current: 2.7A–2.8A (10/1000µs)
• Peak pulse power: 1500W
• Package: DO-214AB (SMC) surface mount
• Unidirectional configuration (single channel)
• RoHS3 compliance and MSL Level 1

Three substitute parts meet these criteria:

1. 1.5SMC400A (Littelfuse Inc.) – Active product with identical electrical specifications and standard temperature range
2. 1.5SMC400AHE3_AIH (Vishay General Semiconductor) – Active product with automotive-grade qualification (AEC-Q101) and extended temperature range
3. SMCJ1.5KE400A-TP (Micro Commercial Co) – Active product with extended upper operating temperature limit

Parameter Comparison

Engineering Selection Recommendations

1.5SMC400A (Littelfuse Inc.) is the primary direct substitute. It is an active product from the original manufacturer with identical electrical specifications, matching temperature range, and equivalent packaging. This part maintains full design compatibility and is recommended for standard applications requiring the 1.5SMC400 specification.

1.5SMC400AHE3_AIH (Vishay General Semiconductor) is suitable for applications requiring automotive-grade qualification. This part carries AEC-Q101 certification and extends the lower operating temperature to -65°C, making it appropriate for automotive and harsh-environment applications. The peak pulse current is 2.7A versus 2.8A in the main part, which remains within the functional tolerance for the 1500W power rating.

SMCJ1.5KE400A-TP (Micro Commercial Co) is an alternative for applications requiring extended upper operating temperature to 175°C. This part maintains all critical electrical parameters and is suitable for high-temperature environments where standard -55°C to 150°C range is insufficient.

All three substitutes are ROHS3 compliant and maintain the DO-214AB (SMC) surface-mount package, ensuring mechanical and thermal compatibility with existing PCB designs.

Frequently Asked Questions (FAQ)

Q: Can 1.5SMC400A be used as a direct replacement for the obsolete 1.5SMC400?

A: Yes. The 1.5SMC400A is a direct substitute with identical reverse standoff voltage (342V), equivalent clamping voltage (548V vs. 575.4V), matching peak pulse current (2.8A), and identical 1500W power rating. Both use the DO-214AB (SMC) package and operate across -55°C to 150°C. The part is active and in stock.

Q: What is the difference between the Littelfuse 1.5SMC400A and the Vishay 1.5SMC400AHE3_AIH?

A: Both parts meet the core electrical specifications. The Vishay part carries AEC-Q101 automotive qualification and operates from -65°C to 150°C (versus -55°C to 150°C for the Littelfuse part). The Vishay part has a peak pulse current of 2.7A compared to 2.8A in the Littelfuse part. Select the Vishay part for automotive or extended low-temperature applications.

Q: Is the SMCJ1.5KE400A-TP compatible with the 1.5SMC400?

A: Yes, the SMCJ1.5KE400A-TP is electrically and mechanically compatible. It maintains the 342V reverse standoff voltage, 548V clamping voltage, 2.8A peak pulse current, and 1500W power rating in the same DO-214AB (SMC) package. The primary advantage is an extended upper operating temperature of 175°C instead of 150°C.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All three substitute parts (1.5SMC400A, 1.5SMC400AHE3_AIH, and SMCJ1.5KE400A-TP) are ROHS3 compliant, matching the compliance status of the original 1.5SMC400.

Q: What packaging options are available for these substitutes?

A: The 1.5SMC400A is available in Cut Tape (CT) and Digi-Reel packaging. The 1.5SMC400AHE3_AIH packaging is not specified in the data. The SMCJ1.5KE400A-TP is supplied in Tape & Reel (TR) format. All parts use the DO-214AB (SMC) surface-mount package.

Q: Can these parts be used interchangeably on the same PCB?

A: Yes. All substitute parts use the identical DO-214AB (SMC) surface-mount package with the same pin configuration and thermal characteristics, allowing direct PCB footprint compatibility without layout modifications.