SMBJ78CD-M3/H Equivalent & Substitute Parts

Part Overview

The SMBJ78CD-M3/H is a Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division, part of the TransZorb® series. This surface-mount component operates as a bidirectional Zener diode in the DO-214AA (SMB) package, designed for general-purpose transient voltage suppression applications. The device is currently in active production status with 1103 units available in inventory. Alternative equivalent parts may be required due to supply constraints, design revisions, or procurement optimization.

Substiute Parts

SMBJ78CD-M3/H

Vishay General Semiconductor - Diodes DivisionIn Stock: 1207SMBJ78CD-M3/H Datasheet

Current PartRFQ

SMBJ78CA-E3/52

Vishay General Semiconductor - Diodes DivisionIn Stock: 4009SMBJ78CA-E3/52 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SMBJ78CD-M3/H is determined by strict equivalence across the following critical parameters:

• Voltage - Reverse Standoff (Typ): 78V
• Voltage - Clamping (Max) @ Ipp: within acceptable tolerance range
• Current - Peak Pulse (10/1000µs): equivalent or greater capacity
• Power - Peak Pulse: 600W minimum
• Package / Case: DO-214AA, SMB (surface mount)
• Bidirectional Channels: 1
• Operating Temperature Range: -55°C to 150°C (TJ)
• RoHS and MSL Compliance: ROHS3 Compliant, MSL 1

The SMBJ78CA-E3/52 meets all substitution criteria as a manufacturer-recommended equivalent within the same SMBJ78 base product family, maintaining identical standoff voltage, package configuration, and compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

Both the SMBJ78CD-M3/H and SMBJ78CA-E3/52 are active-status components manufactured by Vishay within the TransZorb® series. Both devices maintain identical RoHS3 compliance and MSL 1 ratings, ensuring compatibility with standard surface-mount assembly processes and environmental requirements. The SMBJ78CA-E3/52 offers higher inventory availability (3979 units versus 1103 units), making it suitable for high-volume procurement scenarios. Electrical parameters remain functionally equivalent across both parts, with clamping voltage variation of 2V and peak pulse current difference of 0.06A remaining within acceptable engineering tolerances for general-purpose TVS applications.

Frequently Asked Questions (FAQ)

Q: Can SMBJ78CA-E3/52 be used as a direct replacement for SMBJ78CD-M3/H?

A: Yes. Both parts share identical reverse standoff voltage (78V), package configuration (DO-214AA, SMB), operating temperature range (-55°C to 150°C), and compliance certifications (ROHS3, MSL 1). Electrical performance differences are negligible for general-purpose transient suppression applications.

Q: What is the significance of the clamping voltage difference (124V vs. 126V)?

A: The 2V difference in maximum clamping voltage falls within normal manufacturing tolerance for TVS diodes and does not affect functional compatibility in standard circuit protection applications.

Q: Are there any package or mounting differences between these parts?

A: No. Both components use the DO-214AA (SMB) surface-mount package and are compatible with identical PCB layouts and reflow soldering processes.

Q: Do both parts meet the same compliance and environmental standards?

A: Yes. Both SMBJ78CD-M3/H and SMBJ78CA-E3/52 are ROHS3 compliant, carry MSL 1 rating, and are REACH unaffected, meeting identical regulatory and environmental requirements.

Q: Which part should be selected for new designs?

A: Selection should be based on procurement availability and lead time. The SMBJ78CA-E3/52 currently has higher inventory levels. Both parts are functionally equivalent for new design implementations.