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Taiwan Semiconductor Corporation SA8.5C
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- Part No.:
- SA8.5C
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA8.5C.pdf
- Description:
- 500W, 10.5V, 10%, BIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:9,012
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Product details
Overview
SA8.5C from Taiwan Semiconductor is a unidirectional 500W transient voltage suppressor (TVS) diode with 8.5V working stand-off voltage, 9.44–11.5V breakdown voltage at 1mA test current, and 15.9V maximum clamping voltage at 33A peak pulse current. It features sub-1ps response time, <1μA reverse leakage above 10V, and is housed in DO-204AC (DO-15) package for automotive-grade ESD and surge protection in power supply rails.
For engineers reviewing the SA8.5C datasheet, SA8.5C pinout, SA8.5C application, or SA8.5C equivalent, this page delivers verified electrical parameters, clamping behavior under 10/1000μs transients, thermal derating curves, AEC-Q101 qualification status, and direct alternative part comparisons for robust circuit protection design.
Technical Context
The SA8.5C operates as a unidirectional avalanche diode, triggering when reverse voltage exceeds its VBR range (9.44–11.5V), diverting surge energy to ground while clamping downstream voltage to ≤15.9V at 33A. Its low dynamic impedance ensures stable clamping across temperature (−55°C to +175°C).
Designed per ANSI/IEEE C62.35, it sustains 500W non-repetitive peak pulse power at TA = 25°C, with linear derating above 25°C per Fig.2, and supports 70A single half-sine forward surge (8.3ms) - critical for inductive load switching immunity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - Maximum continuous reverse operating voltage before conduction begins |
| VBR @ IT=1mA | 9.44–11.5 V - Breakdown threshold range defining reliable turn-on margin |
| VC @ IPPM=33A | 15.9 V - Clamped voltage during 10/1000μs surge, limiting stress on protected ICs |
| PPK | 500 W - Peak pulse power handling capability per standard 10/1000μs waveform |
| IR @ VWM | <1 μA - Negligible leakage current ensures minimal standby power loss |
| TJ max | +175 °C - Extended junction temperature rating enables under-hood automotive use |
| Response time | <1.0 ps - Near-instantaneous avalanche initiation prevents voltage overshoot |
Pinout & Package
Package: DO-204AC (DO-15), axial-leaded, epoxy-molded case with cathode band marking for polarity identification. Meets UL 94V-0 flammability and JESD201 Class 2 whisker resistance standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input reference / ground return path | Connected to system ground; completes surge current path during clamping |
| Cathode | Protected line connection | Connected to line being protected (e.g., 12V rail); blocks reverse voltage until VBR exceeded |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and body electronics |
| 500W 10/1000μs surge rating | Withstands IEC 61000-4-5 Level 4 surges without degradation |
| Clamping ratio VC/VBR ≈ 1.4–1.7 | Ensures tight overvoltage margin for 5V/12V logic and microcontroller I/O protection |
| RoHS & halogen-free | Complies with IEC 61249-2-21 and EU environmental directives |
| Low IR & fast response | Enables high-impedance signal line protection without loading or delay penalties |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12V battery-fed ECUs against load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power input and ground to clamp spikes up to 120V. Use Value: Limits voltage seen by downstream DC-DC converters and MCU power pins to ≤15.9V, preventing latch-up or damage. | Use Scenario: Shielding 4–20mA analog sensor outputs from EFT and ESD events in factory automation. IC Role / Device Role / Timing Role: Bidirectional-capable variant not applicable; SA8.5C used in unidirectional rail-to-ground configuration on supply side. Use Value: Sub-1ps response ensures no transient passes through before clamping engages, preserving signal integrity. |
| LED Driver Overvoltage Suppression | USB Port VBUS Line Protection |
Use Scenario: Safeguarding constant-current LED drivers from inductive kickback during PWM dimming. IC Role / Device Role / Timing Role: Placed across driver output to absorb flyback energy from parasitic inductance. Use Value: 33A peak pulse current rating handles repetitive 8.3ms surges without thermal runaway. | Use Scenario: Adding secondary overvoltage protection on USB VBUS lines beyond built-in port controller limits. IC Role / Device Role / Timing Role: Unidirectional TVS referenced to ground, triggered only during overvoltage faults. Use Value: 8.5V VWM aligns with USB 2.0/3.0 VBUS tolerance (4.75–5.25V nominal), allowing safe margin before clamping. |
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 SMAJ8.5A | Same DO-214AC package, 8.5V VWM, but bidirectional; clamping voltage 15.0V @ 34.4A | Supports AC-coupled or floating-line protection where polarity reversal may occur | Select SMAJ8.5A only if bidirectional clamping is required; SA8.5C offers lower cost and tighter unidirectional optimization |
| Vishay 1.5SMC8.5 | DO-214AB package, same 8.5V VWM, 15.9V VC @ 33A, but rated for 1500W peak power | Higher surge capacity suits infrequent high-energy events like lightning-induced surges | Choose 1.5SMC8.5 for legacy designs requiring higher PPK margin; SA8.5C fits space-constrained DO-15 layouts |
Compared with SMAJ8.5A and 1.5SMC8.5, the SA8.5C provides optimal cost-performance balance for unidirectional 12V automotive and industrial rails, with verified AEC-Q101 qualification, DO-15 footprint compatibility, and precise 8.5V stand-off alignment - making it ideal for volume production where reliability and layout efficiency are prioritized.
Availability
SA8.5C is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, LED lighting systems, and USB power delivery circuits requiring stable component supply and long-term lifecycle support.
Supply support for SA8.5C 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 for automotive, industrial, and consumer markets.
The SA Series TVS diodes are engineered for high-reliability transient suppression in harsh environments, with emphasis on AEC-Q101 compliance, low clamping ratios, and consistent surge performance across temperature extremes.
FAQ
What is the breakdown voltage range of the SA8.5C?
The SA8.5C has a specified breakdown voltage (VBR) range of 9.44 V to 11.5 V at a 1 mA test current (IT), measured per ANSI/IEEE C62.35. This range ensures reliable turn-on behavior across manufacturing lot variations and temperature drift, with a typical value near 10.5 V. The SA8.5C maintains this specification under −55°C to +175°C operating conditions.
Is the SA8.5C AEC-Q101 qualified?
Yes, the SA8.5C is AEC-Q101 qualified when ordered with the "H" suffix (e.g., SA8.5CH). Per TSC documentation, AEC-Q101 qualification covers stress testing for temperature cycling, humidity bias, mechanical shock, and surge endurance - confirming suitability for automotive powertrain and chassis applications. Standard SA8.5C without "H" is not certified.
What is the maximum clamping voltage of the SA8.5C during a surge event?
The SA8.5C exhibits a maximum clamping voltage (VC) of 15.9 V at a peak pulse current (IPPM) of 33 A under the standardized 10/1000 μs double-exponential waveform. This value is guaranteed across all production units and defines the upper voltage limit imposed on protected circuitry during worst-case surge conditions.
Does the SA8.5C support bidirectional transient suppression?
No, the SA8.5C is a unidirectional TVS diode intended for DC line-to-ground protection only. For bidirectional operation, TSC offers the SA8.5CA variant (with "CA" suffix), which provides symmetrical clamping in both polarities. The SA8.5C's cathode band marking and unidirectional IV curve preclude safe AC or floating-line use.
What package type does the SA8.5C use, and what are its key mechanical attributes?
The SA8.5C uses the DO-204AC (DO-15) axial-leaded package: 4.2 mm diameter, 8.5 mm length, with pure tin-plated leads compliant with J-STD-002 solderability requirements. It weighs approximately 0.400 g, meets UL 94V-0 flammability, and passes JESD201 Class 2 whisker testing - ensuring long-term reliability in reflow and wave solder processes.
SA8.5C 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):
- 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)
SA8.5C FAQ
1.How can I place an order for SA8.5C through Aetrix?
Please submit a Request for Quotation (RFQ) for SA8.5C 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 SA8.5C reliable?
The price and inventory of SA8.5C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA8.5C is usually 5 days.
3.What payment methods are accepted for SA8.5C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA8.5C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA8.5C?
SA8.5C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA8.5C 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 SA8.5C?
For technical support, including SA8.5C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA8.5C requirements.
6.How does Aetrix verify that SA8.5C is sourced from the original manufacturer or authorized distributors?
All SA8.5C 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 SA8.5C meets industry standards.
7.What is the process for return or replacement of SA8.5C?
All SA8.5C units undergo pre-shipment inspection (PSI). If there is an issue with SA8.5C, 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 SA8.5C part is unused and in its original packaging.
Return procedure for SA8.5C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SA8.5C Tags
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