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Taiwan Semiconductor Corporation SA64A
- Part No.:
- SA64A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA64A.pdf
- Description:
- TVS DIODE 64VWM 103VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,537
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Product details
Overview
SA64A from Taiwan Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in DO-204AC (DO-15) package, rated for 500W peak pulse power at 10/1000μs, 64V working stand-off voltage (VWM), 71.1–78.6V breakdown voltage (VBR), and 103V clamping voltage (VC) at 5.0A peak pulse current. It protects automotive and industrial power rails against ESD, EFT, and inductive switching transients.
For engineers reviewing the SA64A datasheet, SA64A pinout, SA64A application, or SA64A equivalent, this device is selected for robust overvoltage protection in 12V–48V DC systems where low clamping ratio, sub-1ns response, and AEC-Q101 qualification are required - especially in lighting modules, body control units, and sensor interface circuits.
Technical Context
The SA64A operates as a silicon avalanche diode with unidirectional polarity, triggered when reverse voltage exceeds its specified VBR range (71.1–78.6V at 1mA test current). Its low dynamic impedance enables fast energy diversion during transients, maintaining clamping voltage at ≤103V under 5.0A 10/1000μs surge.
Designed for operation from –55°C to +175°C junction temperature, it features <1μA reverse leakage at 64V (VWM), 76mV/°C VBR temperature coefficient, and meets JESD201 Class 2 whisker resistance - confirming suitability for high-reliability automotive PCB environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 64 V - Maximum continuous reverse operating voltage before conduction begins; defines system rail compatibility (e.g., 48V nominal bus). |
| VBR min/max | 71.1 V / 78.6 V at 1 mA - Confirmed avalanche onset range; ensures predictable turn-on margin above VWM. |
| VC @ IPPM | 103 V at 5.0 A - Clamped voltage during full-rated 10/1000μs surge; determines protected circuit's maximum transient exposure. |
| PPK | 500 W - Peak pulse power handling per single non-repetitive event; supports IEC 61000-4-5 Level 4 immunity testing. |
| IR @ VWM | <1 μA - Negligible leakage at rated stand-off voltage; avoids power loss or false triggering in low-current monitoring circuits. |
| TJ max | +175 °C - Enables placement near hot components (e.g., power MOSFETs, LED drivers) without thermal derating concerns. |
Pinout & Package
Package: DO-204AC (DO-15), axial leaded, epoxy-molded case with cathode band marking. Leads are pure tin-plated, solderable per J-STD-002, UL 94V-0 rated.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current path / Ground reference | Connected to system ground or low-side return; completes conduction path during transient clamp. |
| Cathode | Transient voltage input / Protected line connection | Connected to the line being protected (e.g., 48V supply rail); avalanche conduction occurs from cathode to anode. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD stress - required for under-hood ECUs and lighting. |
| Clamping ratio VC/VBR | 103 V / 74.9 V ≈ 1.38 - Low ratio confirms efficient energy suppression with minimal overvoltage overshoot on protected ICs. |
| Response time | <1.0 ps (0 V → VBR) - Enables effective suppression of nanosecond-scale ESD events (IEC 61000-4-2) before sensitive inputs are damaged. |
| Halogen-free & RoHS | Complies with IEC 61249-2-21 and EU RoHS Directive - supports green manufacturing and end-of-life compliance for global OEMs. |
Applications
| Automotive LED Headlamp Driver | Industrial 48V DC Power Input Stage |
|---|---|
Use Scenario: Protects LED driver ICs and MOSFETs from load-dump transients (ISO 7637-2 Pulse 5a) and alternator ripple spikes. IC Role / Device Role: Unidirectional TVS placed between 48V rail and chassis ground, clamping surges before they reach downstream regulators. Use Value: With 103V clamping at 5A and 175°C rating, SA64A prevents latch-up or gate oxide rupture in high-brightness LED controllers operating near engine heat sources. |
Use Scenario: Shields programmable logic controllers (PLCs) and I/O modules from inductive kickback and lightning-induced surges on 48V field wiring. IC Role / Device Role: Primary overvoltage clamp on main DC input, coordinated with upstream fuse and downstream TVS arrays. Use Value: 500W surge rating and 64V VWM align precisely with 48V telecom/industrial standards, enabling single-device compliance with IEC 61000-4-5 Level 4 (4kV) |
| Automotive Body Control Module (BCM) | Smart Streetlight Controller |
Use Scenario: Safeguards CAN transceivers and microcontroller GPIOs from ESD (±8kV contact) and electrical fast transients (EFT) on 12V/24V supply lines. IC Role / Device Role: Localized TVS on each power domain (e.g., MCU core, CAN PHY, sensor bias) with cathode tied to rail. Use Value: Sub-1ps response and <1μA leakage preserve signal integrity and battery life in always-on BCM sleep modes while meeting ISO 10605 requirements. |
Use Scenario: Guards outdoor LED driver electronics against induced surges from nearby lightning strikes and grid switching noise on AC/DC converter outputs. IC Role / Device Role: Final-stage DC bus protector after bulk filtering, positioned before buck converters and LED strings. Use Value: DO-15 package allows through-hole mounting on high-thermal-mass heatsink pads; 175°C TJ rating sustains performance inside sealed, sun-exposed enclosures. |
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 DO-214AC package, identical VWM (64V), but lower PPK (400W) and higher VC (104V at 4.3A). | Limited to lower-energy transients; not rated for AEC-Q101 - unsuitable for automotive front-end protection. | Select SMAJ64A only for cost-sensitive industrial controls where AEC-Q101 and 500W margin are unnecessary. |
| 1.5KE68A | Higher VWM (68V), larger DO-204AL (DO-41) package, same 500W rating but slower response (>1ns) and no AEC-Q101 validation. | Requires PCB layout revision due to longer leads and larger footprint; lacks automotive qualification documentation. | Choose 1.5KE68A only if legacy DO-41 footprint must be retained and AEC-Q101 compliance is not required. |
Compared with SMAJ64A and 1.5KE68A, SA64A delivers superior automotive readiness via AEC-Q101 qualification, tighter VBR tolerance (71.1–78.6V vs. ±5%), and optimized clamping (103V) - making it the preferred choice for new 48V vehicle architectures and high-reliability outdoor lighting.
Availability
SA64A is available at Aetrix Electronics and suitable for automotive lighting systems, industrial 48V power supplies, and smart streetlight controllers requiring stable component supply across multi-year production cycles.
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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, serving automotive, industrial, and consumer markets since 1979.
The SA Series TVS diodes are engineered specifically for high-energy transient suppression in harsh-environment applications, emphasizing AEC-Q101 compliance, tight parametric distribution, and thermal resilience up to 175°C junction temperature.
FAQ
What is the polarity configuration of SA64A?
The SA64A is a unidirectional TVS diode, with cathode marked by a band on the DO-204AC (DO-15) package. It conducts only when reverse-biased beyond its breakdown voltage (71.1–78.6V), making it ideal for protecting positive DC rails referenced to ground. Bidirectional variants use "CA" suffixes (e.g., SA64CA), which SA64A is not.
Does SA64A meet AEC-Q101 requirements?
Yes, SA64A is explicitly AEC-Q101 qualified per the manufacturer's documentation. This includes stress testing for temperature cycling, high-temperature reverse bias (HTRB), and ESD (HBM ≥8kV, CDM ≥1kV), confirming its suitability for automotive powertrain, body, and lighting applications where reliability is critical.
What is the maximum clamping voltage of SA64A under surge conditions?
The SA64A has a maximum clamping voltage (VC) of 103 V at 5.0 A peak pulse current (IPPM) under the standard 10/1000μs waveform. This value is measured per ANSI/IEEE C62.35 and represents the upper limit of voltage seen by protected circuitry during a full-rated 500W transient event.
Can SA64A replace SA64 in an existing design?
SA64A offers tighter VBR tolerance (71.1–78.6V) versus SA64 (71.1–86.9V), lower clamping voltage (103V vs. 114V), and improved leakage stability. While both share the same DO-204AC package and pinout, SA64A provides enhanced protection margin and is recommended for new designs; backward compatibility depends on system-level margin analysis.
What is the thermal derating behavior of SA64A above 25°C ambient?
SA64A's peak pulse power (PPK) derates linearly above TA = 25°C per Figure 2 in the datasheet, reaching ~50% of 500W at 100°C ambient. Its 175°C maximum junction temperature allows operation in high-heat zones when mounted on adequate copper area (e.g., 10×10 mm pads), but sustained high-temperature operation requires thermal modeling of the full PCB stackup.
SA64A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-204AC, DO-15, Axial
- Series:
- SA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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):
- 5A
- Power - Peak Pulse:
- 500W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AC (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.
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