SA78A B0G Equivalent & Substitute Parts

Part Overview

The SA78A B0G is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Taiwan Semiconductor Corporation, designed for general-purpose overvoltage protection applications. This component features a 78V reverse standoff voltage with a 126V maximum clamping voltage and 4.1A peak pulse current capability in a through-hole DO-204AC (DO-15) axial package.

The SA78A B0G has been discontinued at DiGi Electronics. Identifying equivalent substitute parts ensures design continuity and maintains supply chain reliability for applications requiring this specific voltage suppression performance.

Substiute Parts

SA78A B0G

Taiwan Semiconductor CorporationIn Stock: 931SA78A B0G Datasheet

Current PartRFQ

SA78A A0G

Taiwan Semiconductor CorporationIn Stock: 949SA78A A0G Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SA78A B0G are identified based on electrical and mechanical parameter equivalence within the TVS diode category. The substitution criteria are strictly limited to the following parameters:

• Voltage - Reverse Standoff (Typ): 78V
• Voltage - Breakdown (Min): 86.7V
• Voltage - Clamping (Max) @ Ipp: 126V
• Current - Peak Pulse (10/1000µs): 4.1A
• Power - Peak Pulse: 500W
• Operating Temperature Range: -55°C to 175°C (TJ)
• Package / Case: DO-204AC, DO-15, Axial
• Mounting Type: Through Hole
• Type: Zener
• Unidirectional Channels: 1

Parts meeting all these electrical and mechanical specifications are classified as direct equivalents and may be substituted without circuit redesign.

Parameter Comparison

Engineering Selection Recommendations

The SA78A A0G is a direct electrical and mechanical equivalent to the SA78A B0G. Both parts are manufactured by Taiwan Semiconductor Corporation and share identical electrical specifications across all critical parameters: 78V reverse standoff voltage, 126V clamping voltage, 4.1A peak pulse current, and 500W peak pulse power rating.

The SA78A A0G maintains the same through-hole DO-204AC (DO-15) axial package configuration, operating temperature range of -55°C to 175°C, and compliance certifications including ROHS3, REACH Unaffected, and EAR99 classification.

The primary distinction is product status: the SA78A B0G is discontinued at DiGi Electronics, while the SA78A A0G is currently active with 935 pieces in stock. For applications currently using the SA78A B0G, the SA78A A0G provides full functional and physical compatibility without circuit modification.

Frequently Asked Questions (FAQ)

Q: Can the SA78A A0G be used as a direct replacement for the SA78A B0G?

A: Yes. The SA78A A0G is electrically and mechanically equivalent to the SA78A B0G. All electrical parameters, package specifications, and compliance certifications are identical. Direct substitution is possible without circuit redesign.

Q: What is the difference between the SA78A B0G and SA78A A0G?

A: The parts are identical in electrical performance and physical specifications. The difference is in product status: SA78A B0G is discontinued at DiGi Electronics, while SA78A A0G is currently active with available inventory.

Q: Are both parts in the same package?

A: Yes. Both the SA78A B0G and SA78A A0G use the DO-204AC (DO-15) axial through-hole package. They are physically interchangeable on printed circuit boards.

Q: Do both parts meet the same compliance standards?

A: Yes. Both parts are ROHS3 compliant, REACH unaffected, and classified as EAR99. Both have Moisture Sensitivity Level 1 (Unlimited). Compliance certifications are identical.

Q: What is the operating temperature range for these TVS diodes?

A: Both parts operate across a junction temperature range of -55°C to 175°C (TJ), suitable for industrial and extended-temperature applications.

Q: Can these parts be used for power line protection?

A: No. Both the SA78A B0G and SA78A A0G are designated for general-purpose applications and do not include power line protection capability.