SMBJ78AE3/TR13 Equivalent & Substitute Parts

Part Overview

The SMBJ78AE3/TR13 is an active surface-mount transient voltage suppressor (TVS) diode manufactured by Microchip Technology. This unidirectional zener-type component provides transient overvoltage protection with a 78V reverse standoff voltage and 126V maximum clamping voltage at peak pulse current. The component is classified as active and widely used in general-purpose protection applications. Finding equivalent or substitute components is necessary when managing supply chain continuity, optimizing inventory across multiple manufacturers, or addressing geographic supplier availability constraints.

Substiute Parts

SMBJ78AE3/TR13

Microchip TechnologyIn Stock: 1180SMBJ78AE3/TR13 Datasheet

Current PartRFQ

SMBJ78A-13-F

Diodes IncorporatedIn Stock: 8706SMBJ78A-13-F Datasheet

DirectRFQ

SMBJ78A-TP

Micro Commercial CoIn Stock: 4182SMBJ78A-TP Datasheet

DirectRFQ

SMBJ78A

MDDIn Stock: 9439SMBJ78A Datasheet

SimilarRFQ

SMBJ78A

MDDIn Stock: 9439SMBJ78A Datasheet

SimilarRFQ

SMBJ78A

MDDIn Stock: 9439SMBJ78A Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of TVS diodes SMBJ78AE3/TR13 is determined by strict electrical and mechanical parameter compatibility. The following critical parameters must remain constant or within acceptable tolerances:

Electrical Parameters (Critical for Substitution):

• Voltage - Reverse Standoff (Typ): 78V
• Voltage - Breakdown (Min): 86.7V
• Voltage - Clamping (Max) @ Ipp: 126V
• Current - Peak Pulse (10/1000µs): 4.7A nominal
• Power - Peak Pulse: 600W
• Type: Unidirectional Zener

Mechanical Parameters (Critical for Substitution):

• Package / Case: DO-214AA (SMB form factor)
• Mounting Type: Surface Mount
• Unidirectional Channels: 1

Compliance and Environmental Parameters:

• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level (MSL): 1 (Unlimited)
• Product Status: Active

Substitute parts must maintain these electrical specifications and physical package compatibility. Operating temperature range variations are secondary to primary electrical and mechanical parameters. The base product number SMBJ78 identifies the voltage class across all substitutes.

Parameter Comparison

Engineering Selection Recommendations

All listed substitutes—SMBJ78A-13-F (Diodes Incorporated), SMBJ78A-TP (Micro Commercial Co), and SMBJ78A (MDD)—are classified as active products from established component manufacturers. All parts meet ROHS3 compliance and maintain MSL 1 moisture sensitivity ratings, confirming unrestricted environmental handling and manufacturing compatibility.

SMBJ78A-13-F and SMBJ78A-TP maintain the tightest electrical equivalence to the primary part, with identical rated peak pulse current (4.7A) and published operating temperature ranges spanning -55°C to 150°C and -55°C to 175°C respectively. SMBJ78A (MDD) exhibits a marginal 0.1A higher peak pulse current specification (4.8A) with an operating range of -50°C to 150°C, representing a minor variation within the same component classification.

All substitute parts utilize the DO-214AA (SMB) package form factor and surface-mount technology, ensuring direct mechanical and electrical interchangeability with the original SMBJ78AE3/TR13.

Frequently Asked Questions (FAQ)

Q: What electrical parameters must match exactly for substitution? A: The voltage class parameters—reverse standoff voltage (78V), breakdown voltage (86.7V minimum), and clamping voltage (126V maximum)—must remain constant. Peak pulse current and power rating should remain at or above the 4.7A and 600W specifications of the original component.

Q: Are all listed substitutes mechanically compatible with the original part? A: Yes. All substitutes use the DO-214AA (SMB) package form factor and surface-mount configuration, enabling direct board-level substitution without redesign or footprint modification.

Q: Does the operating temperature range affect substitution suitability? A: Operating temperature range is a secondary selection criterion. If your application requires operation below -55°C, the SMBJ78AE3/TR13 (-65°C minimum) or SMBJ78A-TP (-55°C minimum) are appropriate choices. For standard industrial temperature ranges, all substitutes are functionally equivalent.

Q: What is the significance of the 4.8A peak pulse current in the MDD variant? A: The SMBJ78A (MDD) specification of 4.8A represents a minor tolerance variation above the 4.7A rating of the primary part. This does not compromise substitution; the component remains electrically equivalent for general-purpose TVS applications.

Q: Are all listed parts RoHS compliant? A: Yes. All substitute parts carry ROHS3 compliance certification, ensuring environmental and regulatory compatibility with modern manufacturing and regional restrictions.

Q: What does MSL 1 (Unlimited) indicate for component handling? A: MSL 1 rating signifies unlimited shelf life without moisture baking requirements, simplifying inventory management and reducing moisture-related manufacturing risk during assembly.