SA70HE3/73 Equivalent & Substitute Parts

Part Overview

The SA70HE3/73 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division, designed for transient overvoltage protection in electronic circuits. This component operates with a 70V reverse standoff voltage and provides clamping at 125V maximum, with a peak pulse current rating of 4A. The part is currently classified as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for ongoing system support and new designs.

Substiute Parts

SA70HE3/73

Vishay General Semiconductor - Diodes DivisionIn Stock: 803SA70HE3/73 Datasheet

Current PartRFQ

SA70AHE3/73

Vishay General Semiconductor - Diodes DivisionIn Stock: 1182SA70AHE3/73 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 eligibility for the SA70HE3/73 is determined by strict alignment of the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

• Voltage - Reverse Standoff (Typ): 70V
• Voltage - Breakdown (Min): 77.8V
• Current - Peak Pulse (10/1000µs): minimum 4A
• Power - Peak Pulse: 500W
• Operating Temperature Range: -55°C ~ 175°C (TJ)
• Type: Zener, Unidirectional, single channel

Mechanical Compatibility Criteria:

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

Compliance Criteria:

• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level (MSL): 1 (Unlimited)

All identified substitute parts maintain these parameters within the specified tolerances, ensuring direct functional and physical interchangeability in circuit applications.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute (Active Status): SA70AHE3/73 from Vishay General Semiconductor - Diodes Division is the direct active equivalent. This part maintains identical electrical specifications with the original SA70HE3/73, including the same 125V clamping voltage, and carries active product status with full AEC-Q101 automotive qualification. Current inventory availability is 1092 units.

Alternative Substitutes (Active Status): SA70A variants from Taiwan Semiconductor Corporation and Micro Commercial Co provide functional equivalence with minor electrical parameter variations. All alternatives maintain the critical 70V reverse standoff voltage, 77.8V minimum breakdown voltage, and 500W peak pulse power rating. The clamping voltage specification differs at 113V maximum versus the original 125V, with proportionally higher peak pulse current ratings (4.4A to 4.6A). These alternatives are suitable for applications where the lower clamping voltage is acceptable within circuit design margins.

Compliance Considerations: SA70AHE3/73 maintains full ROHS3 compliance and AEC-Q101 automotive qualification matching the original part. Taiwan Semiconductor SA70A and Micro Commercial Co variants (SA70A-AP, SA70A-BP, SA70A-TP) provide active product status and general-purpose application suitability. Selection should prioritize compliance requirements specific to the end application.

Frequently Asked Questions (FAQ)

Q: Can SA70A variants directly replace SA70HE3/73 in automotive applications? A: SA70A from Taiwan Semiconductor Corporation maintains the same operating temperature range (-55°C ~ 175°C) and through-hole DO-15 package compatibility. However, automotive-grade qualification (AEC-Q101) is specified only for the Vishay SA70AHE3/73. Application requirements should determine whether automotive qualification is mandatory.

Q: What is the significance of the 125V versus 113V clamping voltage difference? A: The original SA70HE3/73 specifies a maximum clamping voltage of 125V at peak pulse current. SA70A variants specify 113V maximum clamping. This 12V difference represents improved clamping performance in the substitute parts. Circuit designs must confirm that the lower clamping voltage remains within acceptable transient suppression limits for the protected circuit.

Q: Are the Micro Commercial Co variants (SA70A-AP, SA70A-BP, SA70A-TP) electrically identical? A: Yes. SA70A-AP, SA70A-BP, and SA70A-TP from Micro Commercial Co are electrically identical, each specifying 70V reverse standoff, 77.8V breakdown minimum, 113V clamping maximum, and 4.5A peak pulse current. Differentiation is based on packaging format (Bulk) and internal supplier designation only.

Q: Is the DO-204AC package designation equivalent to DO-15? A: DO-204AC and DO-15 refer to the same axial through-hole package configuration. Both designations are used interchangeably in industry documentation for this component form factor. Physical compatibility is assured across all listed parts.

Q: What inventory considerations apply to part selection? A: SA70AHE3/73 (Vishay) has 1092 units in stock. SA70A (Taiwan Semiconductor) has 855 units. Micro Commercial Co variants have 647-769 units available. Selection based on immediate availability and long-term supply chain stability should be evaluated against application timelines.