SMBJ78D-M3/H Equivalent & Substitute Parts

Part Overview

The SMBJ78D-M3/H is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This component is designed for general-purpose transient voltage suppression applications and is currently in active product status. The device operates across a wide temperature range of -55°C to 150°C and is housed in a surface-mount DO-214AA (SMB) package. Finding equivalent or substitute parts may be necessary due to inventory constraints, supply chain considerations, or specific application requirements while maintaining electrical and mechanical compatibility.

Substiute Parts

SMBJ78D-M3/H

Vishay General Semiconductor - Diodes DivisionIn Stock: 1124SMBJ78D-M3/H Datasheet

Current PartRFQ

SMBJ78A-E3/52

Vishay General Semiconductor - Diodes DivisionIn Stock: 45116SMBJ78A-E3/52 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SMBJ78D-M3/H is determined by strict alignment of the following electrical and mechanical parameters:

Critical Substitution Parameters:

• Reverse Standoff Voltage: 78V (Typ)
• Package / Case: DO-214AA, SMB (surface mount)
• Mounting Type: Surface Mount
• Unidirectional Channels: 1
• Series: TransZorb®
• Type: Zener
• RoHS Status: ROHS3 Compliant
• Operating Temperature Range: -55°C ~ 150°C (TJ)

Allowable Variation Parameters:

• Voltage - Breakdown (Min): Within the 78V class specification
• Voltage - Clamping (Max) @ Ipp: Marginal variation acceptable within transient suppression design tolerances
• Current - Peak Pulse (10/1000µs): Equivalent or higher rating
• Power - Peak Pulse: 600W (standard for this package class)

The substitute part SMBJ78A-E3/52 meets all critical parameters and falls within allowable variations for clamping voltage and peak pulse current, maintaining functional equivalence for general-purpose TVS applications.

Parameter Comparison

Engineering Selection Recommendations

Both the SMBJ78D-M3/H and SMBJ78A-E3/52 are active products from Vishay General Semiconductor - Diodes Division and maintain full ROHS3 compliance. Both devices are classified as MSL 1 (Unlimited), indicating no moisture sensitivity constraints during storage or handling.

The SMBJ78A-E3/52 is functionally equivalent for general-purpose TVS applications. The minimal differences in breakdown voltage (86.7V vs. 88.1V) and clamping voltage (126V vs. 124V) remain within the operational tolerance band for the 78V class specification. Peak pulse current ratings (4.8A vs. 4.86A) are effectively equivalent.

Selection between these parts should be based on availability, supply chain lead times, and inventory status rather than electrical performance differentiation.

Frequently Asked Questions (FAQ)

Q: Can SMBJ78A-E3/52 be used as a direct replacement for SMBJ78D-M3/H?

A: Yes. Both parts share identical reverse standoff voltage (78V), package type (DO-214AA, SMB), mounting configuration (surface mount), and operating temperature range (-55°C to 150°C). Electrical parameters fall within acceptable tolerance bands for general-purpose TVS applications.

Q: What are the key differences between these two parts?

A: The primary differences are minor variations in breakdown voltage (86.7V vs. 88.1V minimum) and clamping voltage (126V vs. 124V maximum). These differences are within the design tolerance of the 78V class TVS diode specification and do not affect functional compatibility.

Q: Are both parts RoHS compliant?

A: Yes. Both SMBJ78D-M3/H and SMBJ78A-E3/52 are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity ratings.

Q: Do these parts require different PCB footprints?

A: No. Both parts use the DO-214AA (SMB) surface-mount package, which requires identical PCB footprints and soldering procedures.

Q: What applications are these TVS diodes suitable for?

A: Both parts are rated for general-purpose transient voltage suppression applications. The 78V reverse standoff voltage and 600W peak pulse power rating make them suitable for protecting circuits in the 78V nominal voltage class.

Q: Can I mix these parts in the same production batch?

A: Yes. Both parts are functionally equivalent for general-purpose TVS applications and can be used interchangeably within the same circuit design without performance degradation.