SA78CA B0G Equivalent & Substitute Parts

Part Overview

The SA78CA B0G is a Transient Voltage Suppressor (TVS) diode manufactured by Taiwan Semiconductor Corporation, designed for general-purpose voltage 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 SA78CA B0G is currently discontinued at DiGi Electronics. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this TVS diode specification.

Substiute Parts

SA78CA B0G

Taiwan Semiconductor CorporationIn Stock: 937SA78CA B0G Datasheet

Current PartRFQ

SA78CA A0G

Taiwan Semiconductor CorporationIn Stock: 1123SA78CA A0G Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SA78CA B0G is determined by strict equivalence across all critical electrical and mechanical parameters. The substitute part must satisfy the following criteria:

Electrical Parameters (Must Match Exactly):

• 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
• Bidirectional Channels: 1
• Type: Zener

Mechanical Parameters (Must Match Exactly):

• Mounting Type: Through Hole
• Package / Case: DO-204AC, DO-15, Axial

Compliance Parameters (Must Match Exactly):

• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level (MSL): 1 (Unlimited)
• Operating Temperature Range: -55°C ~ 175°C (TJ)

The SA78CA A0G meets all substitution criteria and is identified as a direct equivalent to the SA78CA B0G.

Parameter Comparison

Engineering Selection Recommendations

The SA78CA A0G is a direct functional and mechanical equivalent to the SA78CA B0G. Both components are manufactured by Taiwan Semiconductor Corporation and share identical electrical specifications, package configuration, and compliance certifications.

Selection Basis:

The SA78CA A0G is recommended as the primary substitute due to the following factors:

1. Product Status: The SA78CA A0G maintains active product status, ensuring ongoing availability and supply chain continuity. The SA78CA B0G is discontinued at DiGi Electronics, making the A0G variant the appropriate replacement for new designs and production continuity.

2. Electrical Equivalence: All critical electrical parameters are identical, including reverse standoff voltage (78V), breakdown voltage (86.7V minimum), clamping voltage (126V maximum), and peak pulse current (4.1A). Power dissipation capability (500W peak pulse) is maintained.

3. Mechanical Compatibility: Both parts utilize the DO-204AC (DO-15) axial through-hole package, ensuring direct board-level compatibility without circuit redesign or PCB modification.

4. Compliance Alignment: Both components maintain ROHS3 compliance, REACH unaffected status, and identical moisture sensitivity levels (MSL 1 - Unlimited), supporting regulatory requirements across manufacturing and deployment environments.

5. Temperature Performance: Operating temperature range (-55°C to 175°C junction temperature) is identical, confirming thermal performance equivalence across all application scenarios.

The SA78CA A0G provides complete functional substitution for the SA78CA B0G without performance degradation or application limitations.

Frequently Asked Questions (FAQ)

Q: Can the SA78CA A0G be used as a direct replacement for the SA78CA B0G in existing designs?

A: Yes. The SA78CA A0G is a direct equivalent to the SA78CA B0G. All electrical parameters, mechanical specifications, and compliance certifications are identical. No circuit modifications or PCB changes are required for substitution.

Q: What is the difference between the SA78CA B0G and SA78CA A0G?

A: The primary difference is product status. The SA78CA B0G is discontinued at DiGi Electronics, while the SA78CA A0G maintains active product status. All technical specifications, including voltage ratings, current capacity, package type, and compliance certifications, are identical between the two parts.

Q: Are the packages identical between these two parts?

A: Yes. Both the SA78CA B0G and SA78CA A0G use the DO-204AC (DO-15) axial through-hole package. Pin configuration, lead spacing, and board mounting requirements are identical, enabling direct substitution without PCB redesign.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the SA78CA B0G and SA78CA A0G are ROHS3 compliant, REACH unaffected, and carry identical moisture sensitivity levels (MSL 1 - Unlimited). Regulatory and environmental compliance requirements are satisfied by either part.

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). This range supports applications in industrial, automotive, and consumer environments with varying thermal conditions.

Q: Can these parts be used interchangeably in production?

A: Yes. The SA78CA A0G can be used interchangeably with the SA78CA B0G in production environments. Identical electrical performance, mechanical fit, and compliance status ensure seamless integration into manufacturing processes without process modifications or qualification changes.

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, 126V clamping voltage, and 4.1A peak pulse current capability support protection of sensitive electronic circuits against voltage transients and overvoltage events.