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Taiwan Semiconductor Corporation SA64C
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- Part No.:
- SA64C
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA64C.pdf
- Description:
- 500W, 79V, 10%, BIDIRECTIONAL, T
- Quantity:
- Payment:
- Shipping:
Inventory:9,133
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Product details
Overview
SA64C from Taiwan Semiconductor is a unidirectional 500W transient voltage suppressor (TVS) diode in DO-204AC (DO-15) package, with 64V working stand-off voltage (VWM), 71.1–86.9V breakdown voltage (VBR @ 1mA), and 114V maximum clamping voltage (VC) at 4.6A peak pulse current. It protects automotive and industrial power rails against ESD, EFT, and inductive switching transients.
For engineers reviewing the SA64C datasheet, SA64C pinout, SA64C application, or SA64C equivalent, key selection criteria include clamping performance under 10/1000μs surge, unidirectional polarity marking, AEC-Q101 qualification status, thermal derating above 25°C, and compatibility with lead-free reflow profiles per J-STD-002.
Technical Context
The SA64C operates as a silicon avalanche diode with fast response (<1.0ps from 0V to VBR), low dynamic impedance, and tightly controlled breakdown threshold. Its unidirectional configuration enables asymmetric protection on DC power lines where reverse polarity is not expected.
Designed for non-repetitive 10/1000μs surge events up to 500W, it features a maximum junction temperature of 175°C, 0.400g mass, and UL 94V-0 molded compound - supporting high-reliability deployment in engine control units, lighting drivers, and industrial PLC I/O modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 64 V - Maximum continuous DC or RMS voltage the device blocks without clamping |
| VBR min/max | 71.1 V / 86.9 V @ 1 mA - Confirmed avalanche onset range defining turn-on consistency across production lot |
| VC @ IPPM | 114 V @ 4.6 A - Clamping voltage during full 500W 10/1000μs surge, limiting downstream voltage stress |
| PPK | 500 W - Peak pulse power rating per standard 10/1000μs waveform, derated linearly above 25°C |
| TJ max | 175 °C - Maximum allowable junction temperature enabling operation in under-hood automotive environments |
| IR @ VWM | <1 μA - Reverse leakage at rated stand-off, minimizing quiescent power loss in battery-backed systems |
| Package | DO-204AC (DO-15) - Industry-standard axial-leaded package with cathode band marking and 9.5 mm lead length thermal pad mounting |
Pinout & Package
DO-204AC (DO-15) axial-leaded package with cathode band indicating the cathode terminal. Leads are pure tin-plated, solderable per J-STD-002, and meet JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Positive reference terminal | Connected to protected line's positive rail; conducts only during forward-biased overvoltage events (e.g., reverse polarity fault) |
| Cathode | Clamping node | Connected to system ground or lower-potential rail; avalanche conduction occurs here during transient suppression |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified option available | SA64CH variant meets automotive-grade reliability testing including temperature cycling, HTRB, and ESD robustness |
| Low clamping ratio (VC/VBR) | 114 V / 71.1 V ≈ 1.60 - Tight voltage margin ensures effective protection without excessive overshoot |
| Sub-nanosecond response | <1.0 ps rise time from 0 V to VBR - Faster than most microcontroller I/O response, enabling pre-failure circuit protection |
| Halogen-free & RoHS compliant | Meets IEC 61249-2-21 and EU Directive 2011/65/EU - Supports environmentally regulated industrial and automotive supply chains |
| UL 94V-0 molding compound | Flame-retardant epoxy housing withstands sustained arcing during catastrophic surge events without ignition |
Applications
| Automotive Engine Control Unit (ECU) Power Input | Industrial LED Driver DC Bus |
|---|---|
Use Scenario: 12 V/24 V battery-fed ECU input subjected to load dump (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Primary TVS clamp on main power rail, placed upstream of DC-DC converter input. Use Value: Limits transient voltage to ≤114 V during 500W surges, preventing damage to buck controller ICs and MCU power domains. | Use Scenario: Constant-current LED driver operating from 48 V DC supply exposed to inductive kickback from relay-controlled outputs. IC Role / Device Role / Timing Role: Unidirectional surge absorber across bulk capacitor terminals. Use Value: Clamps flyback spikes within 1.0 ps, maintaining <100 ns overvoltage duration - below MOSFET avalanche energy threshold. |
| Smart Building HVAC Sensor Node | Factory Automation PLC Digital Input Module |
Use Scenario: Battery-powered wireless sensor node with RS-485 interface connected to long field wiring susceptible to EFT (IEC 61000-4-4). IC Role / Device Role / Timing Role: Secondary-level protection on 3.3 V LDO output feeding RF SoC and sensor interface. Use Value: Sub-1 μA leakage at 64 V stand-off preserves battery life; 175 °C TJ max supports operation inside enclosed HVAC enclosures. | Use Scenario: 24 V digital input channel receiving signals from proximity switches and limit sensors in noisy factory environments. IC Role / Device Role / Timing Role: Front-end transient suppressor before optocoupler input stage. Use Value: 4.6 A IPPM capability handles repetitive EFT bursts without degradation; DO-15 footprint allows manual repair and automated placement. |
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 package; 64 V VWM, 71.1–78.6 V VBR, 103 V VC @ 5.0 A - lower clamping voltage but higher IPPM | Optimized for higher surge repetition rates; lacks AEC-Q101 option in base grade | Select when lower clamping voltage is critical and automotive qualification is not required |
| ON Semiconductor 1.5SMC64A | DO-214AB package; 64 V VWM, 71.1–78.6 V VBR, 103 V VC @ 5.0 A - identical electrical specs but different mechanical form factor | Requires PCB layout change due to larger SMC footprint and different thermal pad requirements | Select when board space permits larger package and higher steady-state power dissipation (5 W vs. 3 W) |
Compared with SMAJ64A and 1.5SMC64A, the SA64C offers identical clamping performance in a smaller DO-15 package with verified AEC-Q101 availability (SA64CH), making it optimal for space-constrained automotive modules where legacy axial-leaded assembly remains in use.
Availability
SA64C is available at Aetrix Electronics and suitable for automotive power management, industrial LED drivers, smart building sensor nodes, and factory automation I/O modules requiring stable component supply and long-term lifecycle support.
Supply support for SA64C 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, specializing in TVS diodes, rectifiers, and power MOSFETs since 1979.
The SA Series was designed specifically for high-energy transient suppression in automotive and industrial power systems, emphasizing tight VBR tolerance, low clamping ratio, and AEC-Q101-compliant reliability under thermal and mechanical stress.
FAQ
What is the maximum clamping voltage of the SA64C under a 10/1000μs surge?
The SA64C has a maximum clamping voltage (VC) of 114 V at 4.6 A peak pulse current (IPPM), measured under the standardized 10/1000μs 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.
Is the SA64C unidirectional or bidirectional, and how is polarity marked?
The SA64C is a unidirectional TVS diode, with polarity indicated by a cathode band on the DO-204AC (DO-15) package body. The cathode terminal must be connected toward the system ground or lower-potential rail to enable proper avalanche clamping during positive transients on the anode side.
Does the SA64C meet AEC-Q101 qualification, and which variant carries this rating?
The base SA64C is not AEC-Q101 qualified; however, the SA64CH variant - identifiable by the "H" suffix in the ordering code - is fully AEC-Q101 qualified and tested per stress conditions including temperature cycling, high-temperature reverse bias, and ESD robustness. Always specify SA64CH for automotive applications.
What is the thermal derating behavior of the SA64C above 25°C ambient?
The SA64C's peak pulse power (PPK) is derated linearly above 25°C ambient, following the curve in Figure 2 of the datasheet. At 75°C ambient, PPK drops to approximately 70% of 500 W (i.e., ~350 W), and at 125°C, it falls to ~40% (~200 W). Derating applies only to non-repetitive pulses; steady-state power dissipation remains limited to 3 W at TL = 75°C.
Can the SA64C replace the SA64A in an existing design?
No - the SA64C and SA64A differ in breakdown voltage range: SA64C is 71.1–86.9 V, while SA64A is 71.1–78.6 V. The wider VBR spread of SA64C may result in earlier or later clamping onset, potentially affecting system immunity margins. Replacement requires validation of clamping timing and voltage headroom in the target application.
SA64C 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:
- -
- Bidirectional Channels:
- 1
- 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:
- General Purpose
- 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)
SA64C FAQ
1.How can I place an order for SA64C through Aetrix?
Please submit a Request for Quotation (RFQ) for SA64C 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 SA64C reliable?
The price and inventory of SA64C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA64C is usually 5 days.
3.What payment methods are accepted for SA64C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA64C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA64C?
SA64C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA64C 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 SA64C?
For technical support, including SA64C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA64C requirements.
6.How does Aetrix verify that SA64C is sourced from the original manufacturer or authorized distributors?
All SA64C 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 SA64C meets industry standards.
7.What is the process for return or replacement of SA64C?
All SA64C units undergo pre-shipment inspection (PSI). If there is an issue with SA64C, 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 SA64C part is unused and in its original packaging.
Return procedure for SA64C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SA64C Tags
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