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onsemi SA64A
- Part No.:
- SA64A
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA64A.pdf
- Description:
- TVS DIODE 64VWM 103VC DO15
- Quantity:
- Payment:
- Shipping:
Inventory:5,530
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Product details
Overview
SA64A from Fairchild Semiconductor is a unidirectional 500 W transient voltage suppressor (TVS) diode in DO-15 package, designed for primary-level surge protection in DC power lines and signal interfaces. It features a 64 V reverse stand-off voltage (VRWM), 71.1–78.6 V breakdown voltage (VBR) at 1.0 mA, 103.0 V clamping voltage at 4.9 A peak pulse current (IPPM), and operates up to +175 °C junction temperature.
For engineers reviewing the SA64A datasheet, pinout, applications, or equivalent options, this device is selected for robust overvoltage protection in industrial power supplies, automotive body electronics, and telecom interface circuits where fast clamping (<1.0 ps response), low leakage (<1.0 µA above 10 V), and high peak pulse power capability are required.
Technical Context
The SA64A employs a glass-passivated silicon junction optimized for unidirectional transient suppression on the 10/1000 µs waveform. Its clamping behavior is defined by low incremental surge resistance and tight VBR tolerance (min/max spread of 7.5 V), enabling predictable voltage limiting during ESD and lightning-induced surges.
It operates with a cathode-marked DO-15 axial package, rated for 1.0 W steady-state power dissipation at 75 °C with 0.375" lead length, and supports non-repetitive forward surge currents up to 70 A (8.3 ms half-sine).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 500 W on 10/1000 µs waveform - sustains single high-energy transients without failure |
| Reverse Stand-off Voltage | 64 V - maximum continuous DC or RMS voltage before significant leakage begins |
| Breakdown Voltage | 71.1–78.6 V at 1.0 mA - precise conduction onset threshold for reliable clamping activation |
| Clamping Voltage | 103.0 V at 4.9 A IPPM - limits downstream circuit voltage during surge events |
| Peak Pulse Current | 4.9 A on 10/1000 µs waveform - quantifies maximum surge current it can safely divert |
| Junction Temperature | +175 °C - enables operation in under-hood automotive and high-ambient industrial environments |
| Response Time | <1.0 ps - ensures sub-nanosecond turn-on for ESD and fast-rising transients |
Pinout & Package
SA64A is housed in a DO-15 axial-leaded package with cathode identified by a color band. The device has two terminals: anode and cathode. Pinout is non-polarized in layout but functionally directional - cathode must be connected toward the protected line's higher potential side for unidirectional clamping.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or return path; defines current flow direction during clamping |
| Cathode | High-side surge input terminal | Marked with color band; connects to protected line; conducts surge current to ground when VRWM exceeded |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Enhances long-term reliability and moisture resistance in harsh environments |
| 500 W peak pulse rating | Provides margin against IEC 61000-4-5 Level 4 (4 kV/2 Ω) surge events |
| Clamping ratio (VC/VBR) | ~1.45 - indicates efficient voltage limiting with minimal overvoltage overshoot |
| Low IR leakage | <1.0 µA above 10 V - avoids parasitic loading in high-impedance sensing or bias networks |
| Fast response time | <1.0 ps - captures ESD events before system ICs experience damage |
Applications
| Industrial Power Supply Input Protection | Automotive Body Control Module (BCM) Interface |
|---|---|
Use Scenario: 24 V DC input stage of programmable logic controller (PLC) power supply exposed to load dump and inductive switching transients. IC Role / Device Role: Primary unidirectional TVS clamp placed between input rail and chassis ground. Use Value: Limits transient voltage to ≤103 V, protecting downstream DC-DC converters and microcontrollers rated for 36 V absolute max. |
Use Scenario: LIN bus physical layer interface in door module, subject to ISO 7637-2 Pulse 1/2a/5a surges. IC Role / Device Role: Unidirectional surge suppressor on LIN data line referenced to battery ground. Use Value: Clamps negative-going transients below –103 V while maintaining <1 µA leakage at 12 V nominal, preserving bus signal integrity. |
| Telecom Ethernet Port Surge Protection | Renewable Energy Charge Controller Input |
Use Scenario: Secondary protection on PoE-powered Ethernet port (12–48 V range) after primary gas discharge tube. IC Role / Device Role: Fast-response TVS in series with common-mode choke, shunting differential surges to ground. Use Value: Sub-ns response ensures clamping before transformer saturation, preventing PHY IC latch-up during ESD contact discharge. |
Use Scenario: PV array input of 64 V nominal solar charge controller subjected to lightning-induced surges. IC Role / Device Role: Standoff-rated TVS across input terminals to absorb 500 W transients per IEC 61643-31. Use Value: 64 V VRWM matches system operating voltage; 103 V VC ensures MOSFET gate drivers remain within safe SOA during surge events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ64A (onsemi) | Same DO-214AC package; 64 V VRWM, 103 V VC @ 4.9 A; 400 W rating (vs. SA64A's 500 W) | Limited to lower-energy transients; suitable where IEC 61000-4-5 Level 3 suffices | Select SMAJ64A if board space requires surface-mount and 400 W rating meets system surge test requirements |
| P6KE68A (Littelfuse) | DO-15 package; 68 V VRWM, 110 V VC @ 4.5 A; 600 W rating; wider VBR tolerance (61.2–74.8 V) | Higher clamping voltage reduces protection margin for 64 V systems; better for 72 V nominal rails | Choose P6KE68A only when system nominal voltage is ≥68 V and higher peak power margin is prioritized over tighter clamping |
Compared with SMAJ64A and P6KE68A, the SA64A delivers superior 500 W surge handling in the DO-15 through-hole format with tighter VBR control and lower clamping voltage-making it optimal for 64 V systems requiring precise, high-energy protection without SMT rework.
Availability
SA64A is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, and telecom interface circuits requiring stable component supply and long-lifecycle availability.
Supply support for SA64A includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Fairchild Semiconductor was a U.S.-based semiconductor company specializing in power management, analog, and discrete components before its acquisition by ON Semiconductor in 2016. Its legacy TVS portfolio remains widely deployed in industrial and automotive systems.
The SA64A belongs to Fairchild's SAxxA family of 500 W unidirectional TVS diodes, engineered for cost-effective, high-reliability surge protection in DC power and signal lines where DO-15 through-hole mounting and precise clamping are critical.
FAQ
What is the maximum clamping voltage of the SA64A under standard test conditions?
The SA64A exhibits a maximum clamping voltage (VC) of 103.0 V when subjected to its rated peak pulse current of 4.9 A on the 10/1000 µs waveform. This value is measured at the device terminals with specified test setup per Rev. D datasheet, and defines the upper voltage limit imposed on protected circuitry during surge events. The SA64A maintains this clamping performance across its full operating temperature range.
Is the SA64A suitable for bidirectional transient suppression?
No, the SA64A is a unidirectional TVS diode and is not rated for bidirectional operation. Its electrical characteristics-including reverse stand-off voltage, breakdown, and clamping-are specified only for forward-biased (cathode-positive) surge conditions. For bidirectional protection, Fairchild offers the SA64CA variant, which uses the same package but provides symmetrical clamping in both polarities.
What is the thermal derating behavior of the SA64A above 75°C ambient?
The SA64A's steady-state power dissipation derates linearly above 75°C ambient, dropping to zero at +175°C junction temperature. At 100°C ambient, its usable power drops to approximately 0.67 W, based on the published derating curve in Figure 5 of the datasheet. This behavior must be accounted for in thermally constrained layouts, especially when used near heat-generating components.
Does the SA64A meet any specific industry surge immunity standards?
The SA64A's 500 W peak pulse rating on the 10/1000 µs waveform aligns with the energy requirements of IEC 61000-4-5 Level 4 (4 kV open-circuit, 2 Ω source impedance). While the device itself is not certified to the standard, its validated clamping performance and pulse handling make it a common choice for designs targeting compliance with that test level in industrial and automotive subsystems.
How does the SA64A's response time compare to typical MOVs or GDTs?
The SA64A achieves a typical response time of less than 1.0 ps-orders of magnitude faster than metal-oxide varistors (MOVs, ~20–50 ns) or gas discharge tubes (GDTs, ~100 ns). This enables it to suppress ESD and fast-rising transients before slower devices activate, making the SA64A ideal as the first line of defense in multi-stage protection schemes where coordination timing is critical.
SA64A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- DO-204AC, DO-15, Axial
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 64V
- Voltage - Breakdown (Min):
- 71.1V
- Voltage - Clamping (Max) @ Ipp:
- 103V
- Current - Peak Pulse (10/1000µs):
- 4.9A
- Power - Peak Pulse:
- 500W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-15
SA64A FAQ
1.How can I place an order for SA64A through Aetrix?
Please submit a Request for Quotation (RFQ) for SA64A on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SA64A reliable?
The price and inventory of SA64A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA64A is usually 5 days.
3.What payment methods are accepted for SA64A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA64A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA64A?
SA64A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA64A order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SA64A?
For technical support, including SA64A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA64A requirements.
6.How does Aetrix verify that SA64A is sourced from the original manufacturer or authorized distributors?
All SA64A products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SA64A meets industry standards.
7.What is the process for return or replacement of SA64A?
All SA64A units undergo pre-shipment inspection (PSI). If there is an issue with SA64A, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SA64A part is unused and in its original packaging.
Return procedure for SA64A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SA64A Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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onsemi
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Diodes Incorporated
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D5V0P1B2LP-7B
Diodes Incorporated
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DESD5V0U1BA-7
Diodes Incorporated
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ESD5Z5.0T1G
onsemi
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DESD5V0U1BB-7
Diodes Incorporated
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D12V0L1B2LP-7B
Diodes Incorporated
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PESD2V0Y1BSFYL
Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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