SA8.0-B Equivalent & Substitute Parts

Part Overview

The SA8.0-B is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for telecom applications. This component features an 8V reverse standoff voltage with a 13.6V maximum clamping voltage and 37.5A peak pulse current capability in a through-hole DO-204AC (DO-15) axial package. The SA8.0-B is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing system support and new design implementations where this specification is required.

Substiute Parts

SA8.0-B

Littelfuse Inc.In Stock: 694SA8.0-B Datasheet

Current PartRFQ

SA8.0A

Taiwan Semiconductor CorporationIn Stock: 300339SA8.0A Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SA8.0-B is determined by strict equivalence across the following critical electrical and mechanical parameters:

Electrical Equivalence Criteria:

• Voltage - Reverse Standoff (Typ): 8V
• Voltage - Breakdown (Min): 8.89V
• Voltage - Clamping (Max) @ Ipp: 13.6V
• Current - Peak Pulse (10/1000µs): ≥37.5A
• Power - Peak Pulse: 500W
• Type: Zener
• Unidirectional Channels: 1

Mechanical Equivalence Criteria:

• Package / Case: DO-204AC (DO-15)
• Mounting Type: Through Hole
• Axial configuration

The SA8.0A from Taiwan Semiconductor Corporation meets all specified electrical parameters with a peak pulse current of 38A, exceeding the minimum 37.5A requirement. Both devices maintain identical voltage specifications and power ratings. The mechanical package, mounting type, and form factor are identical, ensuring direct board-level compatibility.

Parameter Comparison

Engineering Selection Recommendations

The SA8.0A from Taiwan Semiconductor Corporation is a direct functional equivalent to the SA8.0-B. Both devices are RoHS compliant, with the SA8.0A meeting the more stringent ROHS3 standard. The SA8.0A maintains active product status, ensuring ongoing availability and supply chain continuity compared to the obsolete SA8.0-B.

The SA8.0A exhibits a marginally lower minimum operating temperature of -55°C versus the SA8.0-B at -65°C. For applications requiring operation below -55°C, this temperature differential must be evaluated against specific system requirements. The upper temperature limit of 175°C is identical for both devices.

Peak pulse current performance of the SA8.0A (38A) exceeds the SA8.0-B specification (37.5A), providing equivalent or superior transient suppression capability. All voltage parameters, power ratings, and mechanical specifications are identical, supporting direct substitution in existing designs and new implementations.

Frequently Asked Questions (FAQ)

Q: Can the SA8.0A directly replace the SA8.0-B in existing circuit designs?

A: Yes. The SA8.0A meets all electrical specifications of the SA8.0-B, including voltage standoff, breakdown, clamping, and peak pulse current parameters. The mechanical package, mounting type, and form factor are identical, enabling direct board-level substitution without circuit modification.

Q: What is the significance of the operating temperature range difference between these devices?

A: The SA8.0-B operates from -65°C to 175°C, while the SA8.0A operates from -55°C to 175°C. The SA8.0A has a higher minimum operating temperature by 10°C. Applications requiring operation below -55°C must retain the SA8.0-B or identify alternative components with lower temperature specifications.

Q: Are there packaging differences between the SA8.0-B and SA8.0A?

A: Both devices use the DO-204AC (DO-15) axial through-hole package. The SA8.0-B is supplied in standard packaging, while the SA8.0A is available in Tape & Reel (TR) format. The physical component dimensions and pin configuration are identical, ensuring mechanical compatibility.

Q: How do the RoHS compliance levels differ?

A: The SA8.0-B is RoHS Compliant, meeting the original RoHS directive requirements. The SA8.0A is ROHS3 Compliant, meeting the more recent and stringent ROHS3 standard. Both devices satisfy current environmental and regulatory requirements for electronic component manufacturing and use.

Q: What is the basis for substitution between these TVS diodes?

A: Substitution is based on electrical equivalence across voltage parameters (8V standoff, 8.89V breakdown, 13.6V clamping), current capability (38A peak pulse), power rating (500W), device type (Zener), and mechanical compatibility (DO-204AC through-hole package). The SA8.0A meets or exceeds all specified parameters of the SA8.0-B.