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Taiwan Semiconductor Corporation SA64AH
- Part No.:
- SA64AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA64AH.pdf
- Description:
- TVS DIODE 64VWM 103VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,878
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Product details
Overview
SA64AH from Taiwan Semiconductor is a unidirectional AEC-Q101 qualified 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), and clamps to ≤114V at 4.6A peak pulse current. It delivers fast response (<1.0ps from 0V to VBR) and low leakage (<1μA above 10V), designed for automotive-grade ESD and load-dump protection in power electronics.
For engineers reviewing the SA64AH datasheet, SA64AH pinout, SA64AH application, or SA64AH equivalent, this page provides verified electrical parameters, mechanical package details, real-world protection use cases, and validated alternative parts - all specific to the AEC-Q101 qualified SA64AH variant with 64V VWM and DO-15 packaging.
Technical Context
The SA64AH implements a silicon avalanche diode structure optimized for high-energy transient suppression in automotive 12V/24V systems. Its breakdown voltage (VBR) is specified at 71.1–86.9V with 1mA test current, and it maintains stable clamping performance up to TJ = 175°C junction temperature.
It supports unidirectional operation only (cathode-banded polarity), exhibits <1μA reverse leakage at 64V, and achieves 114V maximum clamping voltage (VC) at 4.6A IPPM under 10/1000μs waveform - meeting ISO 7637-2 and ISO 16750-2 surge immunity requirements for automotive electronics.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 64 V - Maximum continuous DC or RMS operating voltage before conduction begins; sets system overvoltage trip threshold. |
| VBR min/max | 71.1 / 86.9 V @ 1 mA - Confirmed avalanche onset range; ensures reliable triggering above normal operating voltage. |
| VC @ IPPM | 114 V @ 4.6 A - Clamped voltage during 10/1000μs surge; defines worst-case stress on downstream ICs. |
| PPK | 500 W - Peak pulse power rating per 10/1000μs waveform; validates capability against ISO 7637-2 Pulse 5a/b. |
| IR @ VWM | <1 μA - Reverse leakage at 64V; minimizes standby power loss and avoids false triggering in high-impedance circuits. |
| TJ max | +175 °C - Maximum junction temperature; enables placement near hot components (e.g., power MOSFETs, engine control units). |
| Package | DO-204AC (DO-15) - Industry-standard axial-leaded package with UL 94V-0 molding compound and tin-plated leads. |
Pinout & Package
SA64AH uses a two-terminal DO-204AC (DO-15) axial package with cathode indicated by a band. Terminals are non-polarized in function but directionally critical: anode connects to protected circuit ground, cathode to line/voltage rail.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Ground reference terminal | Connected to system ground plane; establishes reference for clamping action and carries full surge return current. |
| Cathode | Line-side surge input terminal | Connected to protected signal/power line; avalanche conduction occurs from cathode to anode during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive underhood applications including temperature cycling, humidity bias, and mechanical shock per JESD22 standards. |
| 500W 10/1000μs surge rating | Withstands repetitive load-dump transients (ISO 16750-2) without degradation, supporting 12V/24V battery system robustness. |
| <1.0ps response time | Activates before sensitive logic or analog inputs can be damaged - critical for protecting CAN transceivers and microcontrollers. |
| DO-204AC (DO-15) package | Compatible with standard through-hole assembly and reflow-compatible tin plating; meets J-STD-002 solderability and JESD201 Class 2 whisker resistance. |
| RoHS & halogen-free | Complies with IEC 61249-2-21 and EU RoHS Directive 2011/65/EU - suitable for automotive OEM supply chains requiring material declarations. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Protection |
|---|---|
Use Scenario: Protecting 12V-switched sensor inputs (e.g., door latch, hood open) from inductive kickback and battery dump transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between input line and chassis ground to clamp surges before reaching MCU GPIO or level-shifter ICs. Use Value: Limits voltage seen by downstream SN74LVC1G125 buffer to ≤114V, preventing latch-up and ensuring >100,000-cycle reliability per ISO 16750-2. |
Use Scenario: Safeguarding 24V digital input channels on programmable logic controllers exposed to relay coil flyback and field wiring ESD. IC Role / Device Role / Timing Role: Front-end transient suppressor on isolated input stage, absorbing energy before optocoupler or ADuM1200 digital isolator. Use Value: Maintains <1μA leakage at 24V nominal, avoiding false triggering while clamping 500W surges to protect isolation barrier integrity. |
| LED Headlamp Driver Power Stage | Automotive Infotainment USB Port Protection |
Use Scenario: Suppressing load-dump spikes on buck converter input rails feeding high-power LED arrays in adaptive driving beam systems. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 12V input bus upstream of MPQ4312 step-down controller. Use Value: Withstands 175°C junction temperature during sustained thermal stress, enabling direct mounting on heatsinked PCB areas near power FETs. |
Use Scenario: Providing secondary-level ESD protection on VBUS line of USB 2.0 ports in head units, supplementing integrated TPD2EUSB30. IC Role / Device Role / Timing Role: Coordinated clamping device with <1.0ps response, triggered before internal USB PHY damage thresholds are exceeded. Use Value: Delivers 114V clamping at 4.6A - lower than typical 150V+ clamping of polymer-based TVS - reducing stress on USB switch ICs like TPS6598x. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ64A | Same DO-214AC (SMA) package, 64V VWM, 113V VC @ 4.7A, but not AEC-Q101 qualified. | Approved for industrial/commercial use only; lacks automotive qualification testing (e.g., HTOL, temperature cycling). | Select SMAJ64A only if AEC-Q101 compliance is not required and surface-mount assembly is preferred. |
| ON Semiconductor 1.5KE68A | Higher PPK (1500W), DO-201AD package, 68V VWM, 118V VC @ 12.7A - larger footprint and higher clamping voltage. | Suitable for higher-energy surges but requires more PCB area and offers less precise voltage margin vs. 64V rail. | Choose 1.5KE68A when surge energy exceeds 500W or when legacy DO-201AD layout is fixed. |
Compared with SMAJ64A and 1.5KE68A, the SA64AH uniquely combines AEC-Q101 qualification, DO-15 through-hole compatibility, and tight 114V clamping at 4.6A - making it optimal for cost-sensitive, space-constrained automotive modules where qualification and thermal robustness are mandatory.
Availability
SA64AH is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC input stages, LED driver power supplies, and infotainment USB protection requiring stable component supply across extended temperature and lifecycle demands.
Supply support for SA64AH 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 semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs - serving automotive, industrial, and consumer markets since 1979.
The SA Series was developed specifically for AEC-Q101-compliant transient suppression in 12V/24V automotive subsystems, emphasizing high surge robustness, low leakage, and thermal stability in compact axial packages.
FAQ
What does the "H" suffix in SA64AH signify?
The "H" suffix in SA64AH explicitly denotes AEC-Q101 qualification per the manufacturer's ordering code specification. This means SA64AH has undergone rigorous automotive-grade reliability testing - including temperature cycling, highly accelerated life testing (HALT), and mechanical shock - and is approved for use in automotive powertrain, body, and chassis applications where functional safety and long-term reliability are critical.
Is SA64AH unidirectional or bidirectional?
SA64AH is a unidirectional TVS diode, as confirmed by its cathode band marking, absence of bidirectional specifications in the datasheet, and listing only VBR(min/max) values for unidirectional operation. It must be installed with the banded end (cathode) toward the protected voltage rail and the anode toward ground - reverse orientation will prevent proper clamping during overvoltage events.
What is the maximum clamping voltage of SA64AH and under what test condition?
The maximum clamping voltage of SA64AH is 114 V, measured at 4.6 A peak pulse current (IPPM) under the standardized 10/1000 μs double-exponential surge waveform. This value is guaranteed across the full operating temperature range and defines the upper voltage limit imposed on protected circuitry during worst-case transients.
Can SA64AH replace SA64A in an existing design?
SA64AH can replace SA64A electrically and mechanically - both share identical VWM (64 V), VBR (71.1–86.9 V), VC (114 V), DO-204AC package, and pinout - but SA64AH adds AEC-Q101 qualification. No PCB changes are needed; however, SA64AH should be selected only when automotive qualification is required, as it may carry different traceability and lot-control documentation.
What is the junction-to-ambient thermal resistance (RθJA) for SA64AH?
The datasheet does not specify RθJA for SA64AH. Thermal performance is characterized via derating curves (Fig.2) showing peak pulse power reduction above TA = 25°C, and absolute maximum junction temperature is rated at +175°C. For thermal design, users must rely on PCB copper pad area (10 × 10 mm per lead, per datasheet note) and ambient temperature limits rather than a published RθJA value.
SA64AH 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AC (DO-15)
SA64AH FAQ
1.How can I place an order for SA64AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SA64AH 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 SA64AH reliable?
The price and inventory of SA64AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA64AH is usually 5 days.
3.What payment methods are accepted for SA64AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA64AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA64AH?
SA64AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA64AH 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 SA64AH?
For technical support, including SA64AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA64AH requirements.
6.How does Aetrix verify that SA64AH is sourced from the original manufacturer or authorized distributors?
All SA64AH 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 SA64AH meets industry standards.
7.What is the process for return or replacement of SA64AH?
All SA64AH units undergo pre-shipment inspection (PSI). If there is an issue with SA64AH, 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 SA64AH part is unused and in its original packaging.
Return procedure for SA64AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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