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SA70A Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts
Part Overview
The SA70A is a unidirectional Zener-type transient voltage suppressor diode in DO-15 (DO-204AC) axial package configuration. Manufactured by onsemi, this component is designed for general-purpose transient voltage suppression applications with a 70V reverse standoff voltage and 113V maximum clamping voltage. The SA70A is currently listed as obsolete, making identification of active equivalent and substitute parts essential for ongoing design support and procurement.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Reverse Standoff Voltage (Typ) | 70V |
| Breakdown Voltage (Min) | 77.8V |
| Clamping Voltage (Max) @ Ipp | 113V |
| Peak Pulse Current (10/1000µs) | 4.4A |
| Peak Pulse Power | 500W |
| Type | Zener |
| Unidirectional Channels | 1 |
| Mounting Type | Through Hole |
| Package / Case | DO-204AC, DO-15, Axial |
| Applications | General Purpose |
Substitute Part Grouping Explanation
Substitution of the SA70A is determined by strict equivalence across the following electrical and mechanical parameters:
- Reverse standoff voltage: 70V (±tolerance)
- Breakdown voltage minimum: 77.8V
- Maximum clamping voltage @ Ipp: 113V
- Peak pulse current rating: 4.4A nominal (acceptable range 4.4A to 4.6A)
- Peak pulse power: 500W
- Diode type: Zener, unidirectional
- Package configuration: DO-15 / DO-204AC axial through-hole
- Applications: General Purpose
Substitute parts are classified into two categories:
Direct Equivalents: Parts with identical electrical specifications and active product status from established manufacturers (Vishay, Taiwan Semiconductor Corporation).
Similar Alternatives: Parts from alternative manufacturers (Micro Commercial Co, Fairchild Semiconductor) meeting the same electrical parameters with minor variations in peak pulse current (4.5A to 4.6A) or incomplete specification data.
Parameter Comparison
| Part Number | Manufacturer | Product Status | Reverse Standoff (V) | Breakdown Min (V) | Clamp Max @ Ipp (V) | Peak Pulse Current (A) | Peak Pulse Power (W) | Package | Operating Temp (°C) |
|---|---|---|---|---|---|---|---|---|---|
| SA70A | onsemi | Obsolete | 70 | 77.8 | 113 | 4.4 | 500 | DO-15 | — |
| SA70A-E3/54 | Vishay General Semiconductor | Active | 70 | 77.8 | 113 | 4.4 | 500 | DO-204AC (DO-15) | -55 to 175 |
| SA70AHE3/54 | Vishay General Semiconductor | Active | 70 | 77.8 | 113 | 4.4 | 500 | DO-204AC (DO-15) | -55 to 175 |
| P5KE70A-AP | Micro Commercial Co | Active | 70 | 77.8 | 113 | 4.4 | 500 | DO-15 | -65 to 175 |
| P5KE70A-BP | Micro Commercial Co | Active | 70 | 77.8 | 113 | 4.4 | 500 | DO-15 | -65 to 175 |
| P5KE70A-TP | Micro Commercial Co | Active | 70 | 77.8 | 113 | 4.4 | 500 | DO-15 | -65 to 175 |
| SA70A | Taiwan Semiconductor Corporation | Active | 70 | 77.8 | 113 | 4.6 | 500 | DO-204AC (DO-15) | -55 to 175 |
| SA70A-AP | Micro Commercial Co | Active | 70 | 77.8 | 113 | 4.5 | 500 | DO-15 | -55 to 175 |
| SA70A-BP | Micro Commercial Co | Active | 70 | 77.8 | 113 | 4.5 | 500 | DO-15 | -55 to 175 |
| SA70A-TP | Micro Commercial Co | Active | 70 | 77.8 | 113 | 4.5 | 500 | DO-15 | -55 to 175 |
| P6KE82A | Fairchild Semiconductor | Active | — | — | — | — | — | — | — |
Engineering Selection Recommendations
Primary Substitutes (Direct Equivalents):
SA70A-E3/54 and SA70AHE3/54 from Vishay General Semiconductor are the preferred direct substitutes. Both maintain identical electrical specifications (70V standoff, 77.8V breakdown minimum, 113V clamping maximum, 4.4A peak pulse current) and are in active product status. SA70AHE3/54 carries AEC-Q101 automotive qualification, suitable for applications requiring automotive-grade reliability. Both are RoHS3 compliant.
Secondary Substitutes (Active Alternatives):
P5KE70A series (P5KE70A-AP, P5KE70A-BP, P5KE70A-TP) from Micro Commercial Co provide electrical equivalence with extended operating temperature range (-65°C to 175°C). These parts are active and available in bulk packaging.
SA70A variants from Taiwan Semiconductor Corporation (SA70A) and Micro Commercial Co (SA70A-AP, SA70A-BP, SA70A-TP) offer active alternatives with peak pulse current ratings of 4.5A to 4.6A, within acceptable tolerance of the original 4.4A specification.
Compliance Considerations:
All recommended substitutes maintain REACH Unaffected status and EAR99 export classification consistent with the original SA70A. Vishay parts carry RoHS3 compliance certification. Automotive applications should prioritize SA70AHE3/54 due to AEC-Q101 qualification.
Frequently Asked Questions (FAQ)
Q: Can SA70A-E3/54 be used as a direct replacement for the obsolete onsemi SA70A?
A: Yes. SA70A-E3/54 maintains identical electrical specifications across all critical parameters: 70V reverse standoff voltage, 77.8V minimum breakdown voltage, 113V maximum clamping voltage, and 4.4A peak pulse current. Both use DO-15 package configuration. The part is in active production status.
Q: What is the difference between SA70A-E3/54 and SA70AHE3/54?
A: Both parts are electrically identical with matching voltage and current ratings. SA70AHE3/54 carries AEC-Q101 automotive qualification and is designated for automotive-grade applications. Select SA70AHE3/54 for automotive or mission-critical applications requiring enhanced reliability documentation.
Q: Are P5KE70A series parts compatible with SA70A?
A: P5KE70A series (P5KE70A-AP, P5KE70A-BP, P5KE70A-TP) are electrically equivalent with identical voltage ratings and 4.4A peak pulse current. They differ in operating temperature range (-65°C to 175°C versus unspecified for original SA70A) and packaging format (bulk). These are suitable substitutes for general-purpose applications.
Q: What is the significance of the peak pulse current variation (4.4A, 4.5A, 4.6A) across substitute parts?
A: Peak pulse current ratings of 4.4A, 4.5A, and 4.6A are within acceptable tolerance for this component category and do not affect substitution eligibility. All variants maintain the same 500W peak pulse power rating and 113V clamping voltage specification. Selection should be based on application requirements and availability.
Q: Can SA70A be substituted with P6KE82A?
A: P6KE82A is listed as a similar alternative; however, complete electrical specifications are not provided in available data. Substitution cannot be confirmed without full parameter verification. Consult manufacturer datasheets before selection.
Q: What packaging options are available for SA70A substitutes?
A: Substitute parts are available in two packaging formats: Tape & Reel (TR) for automated assembly and Bulk for manual handling. DO-15 and DO-204AC are equivalent axial package designations. Packaging selection depends on assembly process requirements.
Q: Are all substitute parts RoHS compliant?
A: Vishay parts (SA70A-E3/54, SA70AHE3/54) carry explicit RoHS3 compliance certification. Micro Commercial Co and Taiwan Semiconductor Corporation parts maintain REACH Unaffected status. Verify specific RoHS compliance requirements with individual manufacturers for complete documentation.
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