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onsemi SA64ALFG
- Part No.:
- SA64ALFG
- Manufacturer:
- onsemi
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA64ALFG.pdf
- Description:
- TVS DIODE 64VWM 103VC AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:4,928
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Product details
Overview
SA64ALFG from onsemi is a unidirectional 500 W peak power MiniMOSORB Zener transient voltage suppressor (TVS) designed for clamping high-energy transients in DC power rails and signal lines. It features a 64 V working peak reverse voltage (VRWM), 71.1–78.6 V breakdown voltage (VBR) at 1 mA, 103 V maximum clamping voltage (VC) at 4.9 A peak pulse current (IPP), and sub-1 ns response time. It is used in industrial power supplies and medical equipment input protection.
For engineers reviewing the SA64ALFG datasheet, pinout, applications, or equivalent options, key selection criteria include VRWM ≥ system operating voltage, VC margin relative to protected IC absolute maximum ratings, UL 497B certification for isolated loop circuits, and axial leaded Surmetic package compatibility with through-hole PCB assembly.
Technical Context
The SA64ALFG operates as a unidirectional Zener-based TVS diode, conducting only during negative transients relative to its cathode-banded orientation. Its clamping action relies on avalanche breakdown at VBR, with low zener impedance ensuring stable VC under 4.9 A IPP pulses per the 1.0 ms standard waveform (Figure 4).
It is rated for −55 °C to +150 °C junction temperature, has 33.3 °C/W junction-to-lead thermal resistance, and meets Class 3 ESD (>16 kV HBM). UL 497B recognition confirms suitability for isolated loop circuit protection in safety-critical systems like medical and process controls.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 64 V - Maximum continuous reverse operating voltage before significant leakage; must exceed system DC rail or peak AC voltage. |
| VBR @ IT = 1 mA | 71.1–78.6 V - Breakdown onset range; defines minimum clamping threshold under low-current stress. |
| VC @ IPP = 4.9 A | 103 V - Maximum clamped voltage during 1.0 ms transient; determines worst-case overvoltage seen by downstream ICs. |
| PPK | 500 W - Peak pulse power handling per non-repetitive 1.0 ms surge; derates above 25 °C ambient (Figure 2). |
| IR @ VRWM | 1 μA - Reverse leakage at 64 V; ensures minimal standby power loss and signal integrity in high-impedance circuits. |
| Response Time | <1.0 ns - Enables suppression of fast-rising ESD and lightning-induced transients before sensitive components are damaged. |
| UL Recognition | UL 497B (QVGQ2, File #E210057) - Certified for use in isolated loop protectors, not just flammability-rated packages. |
Pinout & Package
SA64ALFG is housed in ON Semiconductor's Surmetic axial-leaded plastic package (Case 59AA), with cathode indicated by a polarity band. Leads are tin-plated, solderable at 260 °C for 10 seconds at 1/16 inch from case.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current return path | Connected to ground or low-impedance return plane; carries full surge current during clamping. |
| Cathode | Protected circuit connection | Connected to line being protected (e.g., +12 V rail); clamps voltage to ≤103 V when transient exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| 500 W peak pulse power | Handles IEC 61000-4-5 Level 4 surges (4 kV, 2 Ω source) without failure in properly designed layouts. |
| UL 497B recognition | Validates compliance for use in certified isolated loop protection circuits-beyond basic package flammability. |
| Class 3 ESD rating (>16 kV HBM) | Provides robust pre-mounting and handling immunity, reducing field failures from static discharge during assembly. |
| Low zener impedance | Ensures tight VC tolerance across production lots and temperature, critical for predictable overvoltage limiting. |
| Pb-free Surmetic package | Meets RoHS Directive 2011/65/EU and supports lead-free reflow/soldering processes without compromising reliability. |
Applications
| Industrial Power Supply Input Protection | Medical Equipment Mains Interface |
|---|---|
Use Scenario: Protecting AC/DC converter primary-side rectifier outputs and secondary-side 24 V/48 V distribution rails from load dump and lightning-induced surges. IC Role / Device Role / Timing Role: Unidirectional clamping device placed between rail and ground, activated within <1 ns upon overvoltage detection. Use Value: Limits transient voltage to ≤103 V, preventing damage to downstream regulators, controllers, and isolation barriers rated for ≤120 V abs max. |
Use Scenario: Safeguarding patient-connected analog front-ends and isolated communication interfaces (e.g., RS-485, CAN) against ESD and defibrillator discharge events. IC Role / Device Role / Timing Role: Primary-level transient suppressor on isolated power and signal lines entering the patient zone. Use Value: UL 497B certification ensures compliance with IEC 60601-1 requirements for protector classification in medically isolated circuits. |
| Numerical Control System I/O Protection | Process Control Sensor Signal Conditioning |
Use Scenario: Shielding CNC machine PLC digital inputs and relay driver outputs from inductive kickback and ground loop transients. IC Role / Device Role / Timing Role: Rail-to-ground TVS on 24 V DC control lines, mounted adjacent to connectors per IEC 61000-4-4/5 layout guidelines. Use Value: Withstands 500 W surges while maintaining <1 μA leakage at 64 V, preserving logic level integrity during normal operation. |
Use Scenario: Protecting 4–20 mA transmitter output stages and analog sensor inputs (e.g., RTD, thermocouple) from cable discharge and EFT bursts. IC Role / Device Role / Timing Role: Low-capacitance (<10 pF typical) unidirectional clamp on current-loop outputs referenced to system ground. Use Value: Sub-1 ns response prevents transient coupling into precision ADCs, and 64 V VRWM matches common 48 V loop supply headroom. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ64A | Same VRWM (64 V) and VC (103 V), but SMA surface-mount package (JEDEC DO-214AC); lower PPK (400 W). | Requires SMT layout; unsuitable for high-vibration or high-surge industrial chassis where axial leads provide mechanical robustness. | Choose SMAJ64A only if board space is constrained and surge duty is ≤Level 3 per IEC 61000-4-5. |
| 1.5KE68A | Higher VRWM (68 V), higher VC (110 V at 5.5 A), same axial package (DO-201AD); PPK = 1500 W but larger footprint. | Offers greater voltage margin for 72 V nominal systems but increases clamping overshoot; less suitable for 64 V rail protection due to elevated VC. | Select 1.5KE68A only when protecting >68 V rails or requiring >1 kW single-pulse capability; verify VC does not exceed downstream IC limits. |
Compared with SMAJ64A and 1.5KE68A, SA64ALFG provides optimal balance of 64 V VRWM alignment, 103 V VC ceiling, 500 W surge capacity, and UL 497B-certified axial packaging-making it preferred for safety-compliant, through-hole industrial and medical designs.
Availability
SA64ALFG is available at Aetrix Electronics and suitable for industrial power supplies, medical equipment interfaces, and numerical control systems requiring stable component supply with long-term lifecycle support and traceable Pb-free sourcing.
Supply support for SA64ALFG 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
onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power management, analog, sensors, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The SA5.0A Series-including SA64ALFG-is part of onsemi's MiniMOSORB TVS portfolio, engineered specifically for high-reliability transient suppression in safety-critical and regulated environments such as medical devices and industrial automation.
FAQ
What is the clamping voltage of the SA64ALFG under maximum rated surge current?
The SA64ALFG has a maximum clamping voltage (VC) of 103 V when subjected to its rated peak pulse current (IPP) of 4.9 A, measured using the standardized 1.0 ms exponential waveform per Figure 4 in the datasheet. This value represents the worst-case overvoltage imposed on protected circuitry and must be verified against the absolute maximum ratings of downstream components. The SA64ALFG maintains this VC performance across its full operating temperature range of −55 °C to +150 °C.
Does the SA64ALFG meet UL safety standards for circuit protection?
Yes, the SA64ALFG is UL Recognized under UL 497B (File #E210057, Category QVGQ2) for use in isolated loop circuit protectors. This certification covers rigorous testing including strike voltage breakdown, endurance conditioning, dielectric withstand, and discharge validation-not merely package flammability. The SA64ALFG shares this UL listing with the full SA5.0A–SA170A series, confirming its qualification for safety-critical applications like medical and process control systems.
What is the meaning of the "LFG" suffix in SA64ALFG?
The "LFG" suffix in SA64ALFG indicates a Pb-free axial-leaded device with formed leads (lead-formed configuration), packaged in 2000-unit boxes. "L" denotes lead-formed, "F" confirms Pb-free compliance, and "G" signifies the RoHS-compliant Surmetic package. This distinguishes it from SA64AG (Pb-free, straight leads, 1000/unit box) and SA64ARLG (Pb-free, tape-and-reel, 5000 units). All variants share identical electrical specifications and UL 497B recognition.
How does the SA64ALFG compare to bidirectional TVS diodes in surge protection?
The SA64ALFG is unidirectional and optimized for DC rail protection where transients occur primarily in one polarity-such as positive-going spikes on a +64 V line. Unlike bidirectional TVS diodes (e.g., SA64CA), it offers lower capacitance and tighter VBR tolerance but cannot suppress negative transients on grounded lines. For AC or floating signal lines, a bidirectional variant would be required; the SA64ALFG must be oriented with cathode toward the protected rail and anode to ground.
What is the thermal resistance and steady-state power rating of the SA64ALFG?
The SA64ALFG has a junction-to-lead thermal resistance (RJL) of 33.3 °C/W and a steady-state power dissipation (PD) of 3.0 W at TL ≤ 25 °C, derating linearly to 30 mW/°C above TL = 50 °C. This allows safe continuous operation in thermally managed chassis environments but emphasizes that the device is intended for transient-not continuous-power dissipation. Its 500 W peak rating applies only to non-repetitive 1.0 ms pulses, not sustained loads.
SA64ALFG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Package/Case:
- DO-204AC, DO-15, Axial
- Series:
- MiniMosorb™
- Packaging:
- Bulk
- 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:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- Axial
SA64ALFG FAQ
1.How can I place an order for SA64ALFG through Aetrix?
Please submit a Request for Quotation (RFQ) for SA64ALFG 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 SA64ALFG reliable?
The price and inventory of SA64ALFG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA64ALFG is usually 5 days.
3.What payment methods are accepted for SA64ALFG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA64ALFG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA64ALFG?
SA64ALFG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA64ALFG 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 SA64ALFG?
For technical support, including SA64ALFG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA64ALFG requirements.
6.How does Aetrix verify that SA64ALFG is sourced from the original manufacturer or authorized distributors?
All SA64ALFG 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 SA64ALFG meets industry standards.
7.What is the process for return or replacement of SA64ALFG?
All SA64ALFG units undergo pre-shipment inspection (PSI). If there is an issue with SA64ALFG, 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 SA64ALFG part is unused and in its original packaging.
Return procedure for SA64ALFG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SA64ALFG 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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D5V0H1B2LP-7B
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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DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
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D5V0L1B2WS-7
Diodes Incorporated
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