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Taiwan Semiconductor Corporation SA8.5
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- Part No.:
- SA8.5
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA8.5.pdf
- Description:
- 500W, 10.5V, 10%, UNIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:7,380
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Product details
Overview
SA8.5 from Taiwan Semiconductor is a unidirectional 500W transient voltage suppressor (TVS) diode in DO-204AC (DO-15) package, with 8.5V working stand-off voltage, 9.44–11.5V breakdown voltage at 1mA, 15.9V clamping voltage at 33A peak pulse current, and <1μA reverse leakage above 10V - deployed for ESD and inductive switching protection in automotive lighting control modules.
For engineers reviewing the SA8.5 datasheet, SA8.5 pinout, SA8.5 application, or SA8.5 equivalent, key selection criteria include clamping voltage margin vs. protected IC VDD, junction temperature derating above 25°C, unidirectional polarity marking, and compatibility with 10/1000μs surge waveforms per IEC 61000-4-5.
Technical Context
The SA8.5 operates as a silicon avalanche diode optimized for fast transient suppression: it achieves sub-nanosecond response (<1.0ps from 0V to VBR) and exhibits low dynamic impedance during surge events. Its unidirectional configuration enables DC-biased rail protection without reverse conduction path concerns.
Designed for AEC-Q101-compliant applications, the device sustains 175°C maximum junction temperature and supports 70A non-repetitive forward surge (8.3ms half-sine), with thermal derating defined per Fig.2 and peak power limited to 500W at TA = 25°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - Maximum continuous DC or RMS voltage the device blocks without clamping |
| VBR @ IT=1mA | 9.44–11.5 V - Breakdown initiates within this range, defining minimum overvoltage threshold |
| VC @ IPPM=33A | 15.9 V - Clamped voltage seen by protected circuit during 10/1000μs surge, limiting stress on downstream ICs |
| IR @ VWM | <1 μA - Negligible standby leakage, critical for low-power battery-backed systems |
| PPK | 500 W - Peak surge power handling per single 10/1000μs waveform, not repetitive |
| TJ max | 175 °C - Enables operation in under-hood automotive environments with minimal heatsinking |
| Package | DO-204AC (DO-15) - Industry-standard axial leaded package with 0.400g mass and UL 94V-0 molding compound |
Pinout & Package
DO-204AC (DO-15) package with axial leads: cathode indicated by band marking; anode and cathode terminals are non-polarized in layout but functionally asymmetric - cathode connects to protected line, anode to ground for unidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference node | Connected to system ground; establishes reference for clamping action and carries full surge return current |
| Cathode | Protected line interface | Connected to line being safeguarded (e.g., 5V supply rail); avalanche conduction begins here when VIN exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| Sub-1ps response time | Enables suppression before sensitive logic states flip during ESD events (IEC 61000-4-2) |
| Low clamping ratio (VC/VBR ≈ 1.5) | Minimizes overvoltage overshoot relative to breakdown, preserving margin for 3.3V/5V ICs |
| AEC-Q101 qualification option (SA8.5H) | Validated for automotive temperature cycling, mechanical shock, and humidity resistance per stress test plan |
| Halogen-free & RoHS compliant | Meets IEC 61249-2-21 and EU Directive 2011/65/EU for environmentally constrained designs |
| 175°C junction rating | Supports placement near heat sources (e.g., LED drivers, motor controllers) without thermal shutdown |
Applications
| Automotive Lighting Control | Industrial Sensor Interface |
|---|---|
Use Scenario: Protecting CAN/LIN transceivers and microcontrollers in headlight driver modules exposed to load dump and inductive kickback from relay coils. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 5V supply rail and ground, clamping transients before they reach MCU VDD pins. Use Value: Limits clamped voltage to 15.9V, maintaining >2V margin below absolute maximum rating of typical 18V-tolerant automotive MCUs. | Use Scenario: Shielding analog front-end amplifiers and ADC inputs in factory-floor pressure/temperature sensors subjected to electrical fast transients (EFT). IC Role / Device Role / Timing Role: Placed across signal line and ground to shunt nanosecond-scale EFT bursts (IEC 61000-4-4) before input protection diodes activate. Use Value: Sub-1ps response ensures clamping occurs prior to internal ESD diode conduction, preventing latch-up in precision op-amps. |
| DC Power Supply Input Protection | USB-C Port ESD Guard |
Use Scenario: Safeguarding buck converter ICs and MOSFET gate drivers in 12V industrial power supplies experiencing switch-mode noise and accidental overvoltage. IC Role / Device Role / Timing Role: Mounted at input filter stage to clamp surges before bulk capacitance, reducing stress on upstream fuse and input capacitors. Use Value: 500W peak power rating handles 10/1000μs surges up to 33A, exceeding IEC 61000-4-5 Level 3 requirements (1kV/2Ω). | Use Scenario: Providing secondary-level ESD protection on VBUS lines of USB-C receptacles where primary TVS may be undersized for contact discharge events. IC Role / Device Role / Timing Role: Unidirectional placement between 5V VBUS and ground, activated only during positive transients while allowing normal 5V operation. Use Value: 8.5V VWM permits full 5V signaling margin, and 15.9V VC stays below USB PD 3.0 20V max tolerance on VBUS. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ8.0A | DO-214AA package; 8.0V VWM; 12.0V VC @ 38A; bidirectional variant available | Surface-mount footprint; lower clamping voltage but reduced surge current rating (38A vs. 33A) | Select SMBJ8.0A for PCB space-constrained SMT designs requiring same clamping performance with tighter layout |
| P6SMB8.2A | DO-214AA package; 8.2V VWM; 13.4V VC @ 37.4A; JEDEC-registered standard | Higher VC than SA8.5 (13.4V vs. 15.9V) but wider industry acceptance and longer supply chain history | Choose P6SMB8.2A when legacy design reuse or distributor stock availability outweighs marginal clamping advantage |
Compared with SMBJ8.0A and P6SMB8.2A, the SA8.5 offers lower leakage (<1μA) and higher surge robustness in axial-leaded form, making it preferable for through-hole automotive modules where thermal mass and mechanical stability matter more than board area.
Availability
SA8.5 is available at Aetrix Electronics and suitable for automotive lighting control, industrial sensor interface, and DC power supply input protection requiring stable component supply across extended temperature ranges and high-reliability surge immunity.
Supply support for SA8.5 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 headquartered in Hsinchu, Taiwan, specializing in discrete power devices, TVS diodes, rectifiers, and thyristors since 1979.
The SA Series is engineered specifically for high-energy transient suppression in automotive and industrial environments, emphasizing AEC-Q101 compliance, tight VBR tolerances, and robust thermal performance in axial packages.
FAQ
What is the maximum clamping voltage of the SA8.5 under standard 10/1000μs surge conditions?
The SA8.5 exhibits a maximum clamping voltage (VC) of 15.9 V when subjected to its rated peak pulse current of 33 A under the 10/1000μs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during surge events - critical for ensuring compatibility with 5V or 3.3V logic rails.
Is the SA8.5 unidirectional or bidirectional, and how is polarity identified?
The SA8.5 is a unidirectional TVS diode. Polarity is marked by a cathode band on the DO-204AC (DO-15) package body; the banded end connects to the protected line (e.g., 5V rail), while the unbanded end connects to ground. Bidirectional variants use "CA" suffix (e.g., SA8.5CA), which the SA8.5 does not carry.
Does the SA8.5 meet AEC-Q101 qualification, and what does that entail for automotive use?
The base SA8.5 is not AEC-Q101 qualified; however, the SA8.5H variant (ordering code SA8.5H) is fully AEC-Q101 certified. This includes stress testing for temperature cycling, high-temperature operating life, unbiased highly accelerated stress test (uHAST), and mechanical shock - validating suitability for under-hood and chassis-mounted automotive electronics.
What is the reverse leakage current specification for the SA8.5 at its working stand-off voltage?
At its 8.5 V working stand-off voltage (VWM), the SA8.5 specifies reverse leakage current (IR) of ≤1 μA at 25°C. This ultra-low leakage preserves battery life in always-on systems and avoids false triggering in high-impedance sensing circuits - confirmed per test condition in the SA Series datasheet L2105.
How does the SA8.5's thermal derating behave above 25°C ambient temperature?
The SA8.5's peak pulse power (500W) is derated linearly above 25°C ambient per Fig.2 in the datasheet: at 75°C, it retains ~70% of rated power (~350W); at 125°C, ~40% (~200W). This derating applies to single-pulse events and assumes specified PCB copper pad mounting (10×10 mm per lead) - essential for thermal design in enclosed enclosures.
SA8.5 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):
- 8.5V
- Voltage - Breakdown (Min):
- 9.44V
- Voltage - Clamping (Max) @ Ipp:
- 15.9V
- Current - Peak Pulse (10/1000µs):
- 33A
- 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)
SA8.5 FAQ
1.How can I place an order for SA8.5 through Aetrix?
Please submit a Request for Quotation (RFQ) for SA8.5 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 SA8.5 reliable?
The price and inventory of SA8.5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA8.5 is usually 5 days.
3.What payment methods are accepted for SA8.5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA8.5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA8.5?
SA8.5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA8.5 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 SA8.5?
For technical support, including SA8.5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA8.5 requirements.
6.How does Aetrix verify that SA8.5 is sourced from the original manufacturer or authorized distributors?
All SA8.5 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 SA8.5 meets industry standards.
7.What is the process for return or replacement of SA8.5?
All SA8.5 units undergo pre-shipment inspection (PSI). If there is an issue with SA8.5, 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 SA8.5 part is unused and in its original packaging.
Return procedure for SA8.5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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