SA70-E3/73 Equivalent & Substitute Parts

Part Overview

The SA70-E3/73 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division, part of the TransZorb® series. This component is designed for general-purpose transient voltage suppression applications in through-hole configurations using the DO-204AC (DO-15) axial package format.

The SA70-E3/73 is classified as obsolete. Equivalent and substitute parts are available from multiple manufacturers with active product status, offering improved availability and supply chain continuity while maintaining electrical and mechanical compatibility.

Substiute Parts

SA70-E3/73

Vishay General Semiconductor - Diodes DivisionIn Stock: 911SA70-E3/73 Datasheet

Current PartRFQ

SA70A-E3/73

Vishay General Semiconductor - Diodes DivisionIn Stock: 32323SA70A-E3/73 Datasheet

DirectRFQ

SA70A

Taiwan Semiconductor CorporationIn Stock: 890SA70A Datasheet

MFR RecommendedRFQ

SA70A-AP

Micro Commercial CoIn Stock: 809SA70A-AP Datasheet

MFR RecommendedRFQ

SA70A-BP

Micro Commercial CoIn Stock: 841SA70A-BP Datasheet

MFR RecommendedRFQ

SA70A-TP

Micro Commercial CoIn Stock: 713SA70A-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SA70-E3/73 is determined by strict equivalence across the following electrical and mechanical parameters:

• Voltage - Reverse Standoff (Typ): 70V
• Voltage - Breakdown (Min): 77.8V
• Current - Peak Pulse (10/1000µs): 4A minimum
• Power - Peak Pulse: 500W
• Operating Temperature Range: -55°C ~ 175°C (TJ)
• Mounting Type: Through Hole
• Package / Case: DO-204AC, DO-15, Axial
• Type: Zener
• Unidirectional Channels: 1

Substitute parts must maintain these core electrical specifications and the identical through-hole axial package format. Variations in voltage clamping (Max) @ Ipp and peak pulse current above the minimum threshold are acceptable within the design envelope of general-purpose transient suppression applications.

Parameter Comparison

Engineering Selection Recommendations

All listed substitute parts maintain electrical equivalence to the SA70-E3/73 across the critical parameters governing transient voltage suppression performance. Selection among active alternatives should be based on the following factors:

SA70A-E3/73 (Vishay): Direct manufacturer upgrade from the obsolete SA70-E3/73. Maintains Vishay TransZorb® series designation with ROHS3 compliance certification. Voltage clamping reduced to 113V with increased peak pulse current (4.4A). Highest inventory availability (32,300 pcs).

SA70A (Taiwan Semiconductor Corporation): Active product with ROHS3 compliance. Supplied in Tape & Reel packaging. Peak pulse current rated at 4.6A with 113V clamping voltage. Moderate inventory (855 pcs).

SA70A-AP, SA70A-BP, SA70A-TP (Micro Commercial Co): All three variants from Micro Commercial Co offer identical electrical specifications (4.5A peak pulse, 113V clamping). Supplied in bulk packaging. REACH compliance confirmed. Inventory levels range from 647 to 769 pcs per variant.

All substitute parts are rated for the same operating temperature range (-55°C ~ 175°C) and maintain the through-hole axial package format required for direct board-level replacement.

Frequently Asked Questions (FAQ)

Q: Can SA70A-E3/73 directly replace SA70-E3/73 in existing designs?

A: Yes. Both parts share identical reverse standoff voltage (70V), breakdown voltage (77.8V), power rating (500W), operating temperature range (-55°C ~ 175°C), and through-hole DO-204AC axial package format. The SA70A-E3/73 exhibits lower voltage clamping (113V vs 125V) and higher peak pulse current (4.4A vs 4A), which are acceptable variations for general-purpose transient suppression applications.

Q: What is the difference between SA70A variants from Micro Commercial Co (AP, BP, TP)?

A: SA70A-AP, SA70A-BP, and SA70A-TP are electrically identical. All three feature 70V reverse standoff, 77.8V breakdown, 113V clamping, and 4.5A peak pulse current. The suffix designations reflect packaging and distribution channel differences (Bulk packaging). Selection among these variants is based on inventory availability and supply chain preference.

Q: Are all substitute parts RoHS and REACH compliant?

A: SA70A-E3/73 and SA70A (TSC) carry explicit ROHS3 compliance certification. SA70A-AP, SA70A-BP, and SA70A-TP confirm REACH Unaffected status. All parts meet ECCN EAR99 and HTSUS 8541.10.0080 classifications.

Q: Does the reduced voltage clamping in SA70A variants affect circuit protection?

A: The SA70A variants clamp at 113V compared to the original 125V. This represents improved transient suppression performance, as lower clamping voltage provides tighter voltage regulation during transient events. This change is compatible with general-purpose applications and does not compromise circuit protection.

Q: What packaging formats are available?

A: All substitute parts maintain the through-hole DO-204AC (DO-15) axial package format required for direct board-level replacement. SA70A-E3/73 and SA70A (TSC) are available in standard distribution packaging. SA70A-AP, SA70A-BP, and SA70A-TP are supplied in bulk packaging.