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SA64A Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts
Part Overview
The SA64A is a unidirectional Zener-type transient voltage suppressor diode manufactured by onsemi, designed for general-purpose overvoltage protection applications. The device features a 64V reverse standoff voltage with 103V maximum clamping voltage and 4.9A peak pulse current capability in a through-hole DO-15 package. The SA64A is classified as obsolete, necessitating identification of active equivalent and substitute parts that maintain electrical and mechanical compatibility for ongoing production and field replacement requirements.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Reverse Standoff (Typ) | 64V | V |
| Voltage - Breakdown (Min) | 71.1V | V |
| Voltage - Clamping (Max) @ Ipp | 103V | V |
| Current - Peak Pulse (10/1000µs) | 4.9A | A |
| Power - Peak Pulse | 500W | W |
| Type | Zener | — |
| Unidirectional Channels | 1 | — |
| Mounting Type | Through Hole | — |
| Package / Case | DO-204AC, DO-15, Axial | — |
Substitute Part Grouping Explanation
Substitute parts for the SA64A are classified based on strict electrical parameter matching and mechanical compatibility. The primary substitution criteria are:
Critical Parameters for Substitution:
- Voltage - Reverse Standoff (Typ): 64V ± tolerance
- Voltage - Clamping (Max) @ Ipp: 103V
- Current - Peak Pulse (10/1000µs): ≥4.9A
- Type: Zener, Unidirectional
- Mounting Type: Through Hole
- Package / Case: DO-204AC or DO-15 equivalent
Direct Equivalents maintain all electrical parameters within specification and differ only in manufacturer, packaging format (Tape & Reel vs. Bulk), or minor part number variants.
Similar Substitutes maintain the critical voltage and clamping parameters but may exhibit variations in peak pulse current (within acceptable range) or operating temperature specifications. These parts are electrically compatible for the same application circuit but require verification of thermal performance in the target system.
Parameter Comparison
| Part Number | Manufacturer | VWM (Typ) [V] | VBR (Min) [V] | VC (Max) @ Ipp [V] | Ipp (10/1000µs) [A] | Power [W] | Package | Status |
|---|---|---|---|---|---|---|---|---|
| SA64A | onsemi | 64 | 71.1 | 103 | 4.9 | 500 | DO-15 | Obsolete |
| SA64A-E3/54 | Vishay | 64 | 71.1 | 103 | 4.9 | 500 | DO-204AC | Active |
| SA64AHE3/54 | Vishay | 64 | 71.1 | 103 | 4.9 | 500 | DO-204AC | Active |
| P5KE64A-AP | Micro Commercial Co | 64 | 71.1 | 103 | 4.9 | 500 | DO-15 | Active |
| P5KE64A-BP | Micro Commercial Co | 64 | 71.1 | 103 | 4.9 | 500 | DO-15 | Active |
| P5KE64A-TP | Micro Commercial Co | 64 | 71.1 | 103 | 4.9 | 500 | DO-15 | Active |
| P6KE75A | Fairchild Semiconductor | 64.1 | 71.3 | 103 | 6.1 | 600 | DO-15 | Active |
| P6KE75A-B | Littelfuse Inc. | 64.1 | 71.3 | 103 | 5.9 | 600 | DO-204AC | Active |
| SA64A | Taiwan Semiconductor Corporation | 64 | 71.1 | 103 | 5 | 500 | DO-204AC | Active |
| SA64A-AP | Micro Commercial Co | 64 | 71.1 | 103 | 5 | 500 | DO-15 | Active |
| SA64A-BP | Micro Commercial Co | 64 | 71.1 | 103 | 5 | 500 | DO-15 | Active |
Engineering Selection Recommendations
Direct Replacement (Preferred): SA64A-E3/54 (Vishay) and SA64AHE3/54 (Vishay) provide direct electrical equivalence to the obsolete onsemi SA64A. Both maintain identical voltage and current specifications. SA64AHE3/54 includes AEC-Q101 automotive qualification and ROHS3 compliance, suitable for automotive and industrial applications requiring enhanced reliability documentation.
Functional Equivalents: P5KE64A series (Micro Commercial Co) variants—P5KE64A-AP, P5KE64A-BP, and P5KE64A-TP—provide identical electrical performance with active product status. These parts are available in bulk packaging and maintain the same voltage and current ratings. Operating temperature range extends to -65°C, providing enhanced low-temperature performance compared to the original specification.
SA64A (Taiwan Semiconductor Corporation) and SA64A-AP, SA64A-BP (Micro Commercial Co) maintain base electrical specifications with minor peak pulse current variations (5A vs. 4.9A). These represent the same base product family with different manufacturers and packaging options.
Higher Current Capability Alternative: P6KE75A series (Fairchild Semiconductor and Littelfuse Inc.) offers increased peak pulse current (5.9A to 6.1A) and power dissipation (600W vs. 500W) while maintaining the 103V clamping voltage. This option is suitable for applications requiring additional transient energy absorption margin. P6KE75A-B (Littelfuse) includes ROHS3 compliance and is available in DO-204AC packaging.
All recommended substitutes maintain through-hole mounting compatibility and general-purpose application suitability. Product status verification and compliance documentation availability should be confirmed for specific procurement requirements.
Frequently Asked Questions (FAQ)
Q: Can I use P6KE75A as a direct replacement for SA64A? A: P6KE75A maintains the same 103V clamping voltage and 64.1V standoff voltage, making it electrically compatible. However, it provides higher peak pulse current (6.1A vs. 4.9A) and power dissipation (600W vs. 500W). This represents an upgrade in transient energy handling capability and is suitable for the same application circuit. Verify that the increased current capability does not introduce unintended circuit behavior in your specific design.
Q: What is the difference between SA64A-E3/54 and SA64AHE3/54? A: Both parts are Vishay equivalents with identical electrical specifications. SA64AHE3/54 includes AEC-Q101 automotive qualification and is graded for automotive applications. Select SA64AHE3/54 if your application requires automotive-grade reliability documentation or operates in automotive environments.
Q: Are the Micro Commercial Co variants (P5KE64A and SA64A series) interchangeable? A: Yes. P5KE64A-AP, P5KE64A-BP, P5KE64A-TP, SA64A-AP, and SA64A-BP all maintain the same 64V standoff and 103V clamping specifications. Differences exist only in manufacturer, packaging format (Bulk), and minor peak pulse current variations (4.9A to 5A). These are functionally equivalent for general-purpose transient suppression.
Q: Does packaging format (Tape & Reel vs. Bulk) affect electrical performance? A: No. Packaging format affects only procurement, handling, and assembly processes. Tape & Reel packaging (SA64A-E3/54, SA64AHE3/54) is optimized for automated assembly. Bulk packaging (P5KE64A variants, SA64A-AP, SA64A-BP) is suitable for manual assembly or lower-volume applications. Electrical performance is identical.
Q: What operating temperature range should I verify for my application? A: The original SA64A specification does not include operating temperature data. Active substitutes specify -55°C to 175°C (Vishay, Taiwan Semiconductor, Micro Commercial Co SA64A variants) or -65°C to 175°C (Micro Commercial Co P5KE64A variants). Verify that the selected substitute's operating temperature range meets your system requirements.
Q: Can I mix different manufacturers in the same circuit board? A: Yes. All recommended substitutes maintain identical electrical specifications for voltage and current parameters. However, verify that your procurement and quality assurance processes accommodate multiple manufacturers for the same functional position. Document manufacturer selection in your bill of materials for traceability.
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