SA8.5A-E3/73 Equivalent & Substitute Parts

Part Overview

The SA8.5A-E3/73 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This component operates as a Zener-type TVS device with an 8.5V reverse standoff voltage and 14.4V maximum clamping voltage, designed for general-purpose transient protection applications. The device is housed in a DO-204AC (DO-15) axial through-hole package and is currently in active production status with ROHS3 compliance. Equivalent and substitute parts are identified based on matching electrical performance parameters and mechanical compatibility within the TVS diode category.

Substiute Parts

SA8.5A-E3/73

Vishay General Semiconductor - Diodes DivisionIn Stock: 32303SA8.5A-E3/73 Datasheet

Current PartRFQ

P6KE10A

Fairchild SemiconductorIn Stock: 5025P6KE10A Datasheet

MFR RecommendedRFQ

SA8.5A

Taiwan Semiconductor CorporationIn Stock: 8461SA8.5A Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SA8.5A-E3/73 are identified based on the following critical electrical and mechanical parameters:

• Voltage - Reverse Standoff: 8.5V (exact match required)
• Voltage - Clamping (Max) @ Ipp: 14.4V to 14.5V (within acceptable tolerance)
• Current - Peak Pulse (10/1000µs): 34.7A minimum (equal or greater capacity)
• Power - Peak Pulse: 500W minimum (equal or greater capacity)
• Package / Case: DO-204AC or DO-15 (mechanical compatibility)
• Mounting Type: Through Hole (functional equivalence)
• Type: Zener (functional equivalence)
• Unidirectional Channels: 1 (functional equivalence)

Substitutes must maintain compatibility across all listed parameters to ensure direct replacement capability in circuit applications.

Parameter Comparison

Engineering Selection Recommendations

All three parts—SA8.5A-E3/73 (main), P6KE10A, and SA8.5A—are active production components suitable for direct substitution based on electrical parameter alignment and mechanical compatibility. Selection should be based on the following criteria:

• SA8.5A-E3/73 and SA8.5A both carry ROHS3 compliance certification, meeting environmental regulatory requirements for restricted substances.
• P6KE10A offers higher peak pulse current (43A) and power dissipation (600W) compared to the main part (34.7A, 500W), providing enhanced transient protection margin.
• SA8.5A maintains identical electrical specifications and temperature range to the main part while differing only in packaging format (Tape & Reel versus standard packaging).
• All parts maintain the same reverse standoff voltage (8.5V) and clamping voltage range (14.4V–14.5V), ensuring circuit protection performance equivalence.

Frequently Asked Questions (FAQ)

Q: Can P6KE10A replace SA8.5A-E3/73 directly?

A: Yes. P6KE10A meets all critical electrical parameters: 8.5V reverse standoff voltage, 14.5V clamping voltage, and 43A peak pulse current (exceeding the main part's 34.7A). Both use DO-15 axial through-hole packaging. The higher current and power ratings provide additional transient protection margin.

Q: What is the difference between SA8.5A-E3/73 and SA8.5A?

A: Both parts are manufactured by Taiwan Semiconductor Corporation with identical electrical specifications: 8.5V standoff voltage, 9.44V breakdown voltage, 14.4V clamping voltage, and 36A peak pulse current. The primary difference is packaging format: SA8.5A-E3/73 uses standard packaging while SA8.5A is supplied in Tape & Reel format. Both maintain -55°C to 175°C operating temperature range and ROHS3 compliance.

Q: Are all substitute parts compatible with the same PCB footprint?

A: Yes. All three parts use DO-204AC (DO-15) axial through-hole packages with identical mechanical dimensions, ensuring direct PCB footprint compatibility without layout modifications.

Q: What parameters must remain constant for substitution?

A: Reverse standoff voltage (8.5V), clamping voltage range (14.4V–14.5V), package type (DO-15 axial), and mounting method (through-hole) are the critical parameters determining substitution eligibility. Peak pulse current and power dissipation may exceed the main part specifications without affecting compatibility.

Q: Does operating temperature range affect substitution?

A: P6KE10A operates from -50°C to 175°C, while SA8.5A-E3/73 and SA8.5A operate from -55°C to 175°C. For applications requiring operation below -50°C, SA8.5A or SA8.5A-E3/73 are required. For standard applications within -50°C to 175°C, all three parts are equivalent.