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Taiwan Semiconductor Corporation SA64H
- Part No.:
- SA64H
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA64H.pdf
- Description:
- 500W, 79V, 10%, UNIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:9,958
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Product details
Overview
SA64H from Taiwan Semiconductor is an AEC-Q101-qualified 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), 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 ESD and load-dump protection in engine control units and body electronics.
For engineers reviewing the SA64H datasheet, SA64H pinout, SA64H application, or SA64H equivalent, key selection criteria include its AEC-Q101 qualification, 64V VWM tolerance, 114V clamping voltage at 4.6A, DO-15 mechanical compatibility, and unidirectional polarity marking - all critical for robust 12V/24V automotive circuit protection.
Technical Context
The SA64H operates as a silicon avalanche diode with precise breakdown voltage range of 71.1–86.9V at 1mA test current, enabling reliable overvoltage clamping before downstream IC damage. Its unidirectional configuration supports cathode-anode forward conduction during surge events while blocking reverse leakage below 1μA at 64V.
Thermal design is enabled by a 175°C maximum junction temperature and derating curves supporting operation up to 125°C ambient. The device sustains 70A non-repetitive forward surge current (8.3ms half-sine) and exhibits a 86mV/°C breakdown voltage temperature coefficient - essential for stable clamping across automotive temperature ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 64V - Maximum continuous reverse operating voltage before clamping begins; sets system-level surge immunity threshold. |
| VBR min/max | 71.1V / 86.9V at 1mA - Confirmed avalanche breakdown window ensures consistent turn-on behavior across production lots. |
| VC @ IPPM | 114V at 4.6A - Clamping voltage under 10/1000μs surge defines worst-case voltage seen by protected ICs. |
| PPK | 500W - Peak pulse power rating determines survivability against ISO 7637-2 Load Dump Pulse 5a (12V systems). |
| TJ max | 175°C - Enables placement near high-power components in under-hood ECUs without thermal derating concerns. |
| IR @ VWM | <1μA - Ultra-low reverse leakage minimizes standby power loss and avoids false triggering in high-impedance sensor interfaces. |
Pinout & Package
Package: DO-204AC (DO-15), axial leaded, epoxy-molded case with UL 94V-0 flammability rating and pure tin-plated leads compliant with J-STD-002 solderability. Polarity marked by cathode band; weight ≈0.400g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Surge current return path | Connected to ground or low-impedance return plane; must handle 70A single-pulse surge without bond wire failure. |
| Cathode | Protected line connection | Connected to I/O line being safeguarded; cathode band marking ensures correct orientation during PCB assembly. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per stress test plan. |
| 500W 10/1000μs surge rating | Meets ISO 7637-2 Pulse 5a requirements for 12V vehicle systems without external series impedance. |
| <1.0ps response time | Clamps transients before propagation into sensitive analog front-ends or CAN transceivers. |
| DO-204AC (DO-15) package | Industry-standard footprint compatible with legacy automotive PCB layouts and automated insertion equipment. |
| Halogen-free & RoHS compliant | Fulfills EU ELV Directive and OEM material declaration requirements for end-of-life recyclability. |
Applications
| Engine Control Unit (ECU) Power Input Protection | Automotive Body Control Module (BCM) I/O Protection |
|---|---|
Use Scenario: Protects 12V supply rail of engine ECU against ISO 7637-2 Load Dump pulses (up to 60V sustained, 120V transient). IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery input and DC-DC converter input stage. Use Value: Clamps surge to ≤114V within <1.0ps, preventing overvoltage damage to LDO regulators and microcontroller power pins. |
Use Scenario: Shields LIN bus transceiver I/O lines from ESD events (IEC 61000-4-2 ±8kV contact) and cable discharge. IC Role / Device Role / Timing Role: Unidirectional TVS connected between LIN data line and ground, adjacent to transceiver. Use Value: Sub-1μA leakage avoids signal distortion on 19.2kbps LIN bus; 114V clamping prevents latch-up in transceiver ESD structures. |
| Automotive Lighting Driver Output Protection | Electric Power Steering (EPS) Sensor Interface Protection |
Use Scenario: Safeguards high-side MOSFET gate driver outputs in LED headlamp modules from inductive kickback during PWM switching. IC Role / Device Role / Timing Role: TVS placed across driver output and ground to absorb flyback energy from LED string inductance. Use Value: 500W rating handles repetitive 10/1000μs surges from 2A LED current interruption; DO-15 package fits tight thermal zones near drivers. |
Use Scenario: Protects analog voltage outputs of steering angle sensors from coupled transients on shared chassis harnesses. IC Role / Device Role / Timing Role: Unidirectional TVS on 5V sensor supply line, located at connector entry point. Use Value: 64V VWM allows normal 5V operation while clamping 100V+ transients to safe levels for 12-bit ADC inputs. |
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 64V VWM, but 400W PPK rating and SMA package (surface-mount); lower clamping voltage (103V @ 4.6A). | Requires PCB rework for SMT layout; better suited for space-constrained modules without axial lead constraints. | Select SMAJ64A only if board real estate is limited and 400W surge margin suffices for target test pulses. |
| P6KE68A | 68V VWM, 600W PPK, DO-15 package; higher clamping voltage (115V @ 5.2A) and no AEC-Q101 qualification. | Lacks automotive reliability validation; suitable for industrial controls but not safety-critical vehicle systems. | Choose P6KE68A only for non-automotive applications where AEC-Q101 is not mandated and 68V VWM aligns with system margin. |
Compared with SMAJ64A and P6KE68A, the SA64H uniquely combines AEC-Q101 qualification, 500W surge capability in DO-15, and 64V VWM - making it the only drop-in solution for automotive 12V supply rail protection requiring validated reliability and through-hole assembly.
Availability
SA64H is available at Aetrix Electronics and suitable for automotive ECU power input protection, body control module I/O hardening, and lighting driver output surge suppression requiring stable component supply across multi-year vehicle production cycles.
Supply support for SA64H 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, and rectifiers with global automotive and industrial certifications.
The SA Series was developed specifically for AEC-Q101-compliant transient suppression in 12V/24V automotive subsystems, emphasizing high surge robustness, low leakage, and mechanical compatibility with legacy DO-15 assembly processes.
FAQ
What is the breakdown voltage range of the SA64H?
The SA64H has a guaranteed breakdown voltage (VBR) range of 71.1V to 86.9V measured at 1mA test current, ensuring consistent clamping onset across temperature and process variation. This range directly supports its 64V working stand-off voltage and enables reliable protection against transients exceeding system nominal voltage without premature conduction.
Is the SA64H suitable for bidirectional surge protection?
No, the SA64H is a unidirectional TVS diode, indicated by its "SA" prefix (not "SAC" or "SAxxA") and cathode-band polarity marking. It conducts only in reverse bias during overvoltage events and blocks forward current above ~3.5V. For bidirectional protection, select SA64A (bidirectional variant) or verify polarity alignment in the circuit schematic before use.
Does the SA64H meet AEC-Q101 requirements?
Yes, the "H" suffix in SA64H explicitly denotes AEC-Q101 qualification per Taiwan Semiconductor's ordering code documentation. This includes stress testing for temperature cycling, high-temperature reverse bias (HTRB), and ESD per the AEC-Q101 standard - confirming suitability for automotive under-hood and cabin applications.
What is the maximum clamping voltage of the SA64H under surge conditions?
The SA64H clamps to a maximum of 114V when subjected to its rated 4.6A peak pulse current (IPPM) under the standard 10/1000μs waveform. This value is specified in the electrical characteristics table and defines the upper voltage limit imposed on protected circuitry during worst-case surge events.
Can the SA64H be used in 24V automotive systems?
Yes, the SA64H is commonly deployed in 24V commercial vehicle systems - its 64V VWM provides adequate margin above 28V maximum charging voltage, while its 114V clamping voltage remains within safe operating limits for 36V-rated downstream components. Confirm system-level surge test compliance (e.g., ISO 16750-2) during validation.
SA64H 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:
- 114V
- Current - Peak Pulse (10/1000µs):
- 4.6A
- 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)
SA64H FAQ
1.How can I place an order for SA64H through Aetrix?
Please submit a Request for Quotation (RFQ) for SA64H 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 SA64H reliable?
The price and inventory of SA64H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA64H is usually 5 days.
3.What payment methods are accepted for SA64H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA64H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA64H?
SA64H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA64H 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 SA64H?
For technical support, including SA64H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA64H requirements.
6.How does Aetrix verify that SA64H is sourced from the original manufacturer or authorized distributors?
All SA64H 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 SA64H meets industry standards.
7.What is the process for return or replacement of SA64H?
All SA64H units undergo pre-shipment inspection (PSI). If there is an issue with SA64H, 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 SA64H part is unused and in its original packaging.
Return procedure for SA64H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SA64H Tags
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