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Taiwan Semiconductor Corporation SA8.5A
- Part No.:
- SA8.5A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA8.5A.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,659
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Product details
Overview
SA8.5A 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, 9.44–10.4V breakdown voltage at 1mA, 14.4V clamping voltage at 36A peak pulse current, and <1μA reverse leakage above 10V - deployed for ESD and lightning surge protection in automotive lighting control modules.
For engineers reviewing the SA8.5A datasheet, SA8.5A pinout, SA8.5A application, or SA8.5A equivalent, key selection criteria include clamping voltage margin vs. protected IC VDD, unidirectional polarity marking, DO-15 thermal derating above 25°C, and AEC-Q101 qualification status for automotive-grade reliability validation.
Technical Context
The SA8.5A operates as a silicon avalanche diode with fast response (<1.0ps from 0V to VBR) and low dynamic impedance, enabling effective suppression of EFT bursts and inductive switching transients. Its unidirectional configuration provides forward conduction path only during overvoltage events on the cathode side.
Designed for single-pulse 10/1000μs waveform compliance per IEC 61000-4-5, it delivers 500W peak power dissipation at TA = 25°C, derated linearly above ambient temperature per Fig.2, with maximum junction temperature of 175°C and storage range from –55°C to +175°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - Maximum continuous reverse operating voltage before clamping begins; sets upper limit for system rail voltage compatibility. |
| VBR @ IT=1mA | 9.44–10.4 V - Measured breakdown threshold defining turn-on precision; tight tolerance supports predictable protection timing. |
| VC @ IPPM=36A | 14.4 V - Clamped voltage under 10/1000μs surge; must remain below protected IC's absolute maximum rating. |
| IPPM | 36 A - Peak pulse current capability at rated clamping voltage; determines survivability against defined surge levels. |
| IR @ VWM | <1 μA - Reverse leakage at stand-off voltage; ensures minimal standby power loss and signal integrity in high-impedance circuits. |
| TJ(max) | 175 °C - Maximum junction temperature; defines thermal design margin for PCB copper pad layout and airflow requirements. |
| Package | DO-204AC (DO-15) - Standard axial-leaded package with 10×10 mm copper pad thermal mounting requirement for full 500W rating. |
Pinout & Package
DO-204AC (DO-15) package with axial leads: Cathode identified by band marking; anode and cathode terminals support through-hole mounting. Thermal performance requires 10×10 mm copper pads per lead for rated 500W surge handling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Ground reference terminal | Connected to system ground or low-side return path; completes clamping loop during transient events. |
| Cathode | Protected line input | Connected to supply rail or signal line needing protection; polarity band identifies this terminal. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified variant available | SA8.5AH version meets automotive stress test requirements including temperature cycling, HTRB, and ESD robustness. |
| Fast response time | <1.0 ps rise from 0V to VBR enables suppression before sensitive logic thresholds are exceeded. |
| Low clamping ratio | VC/VBR ≈ 1.45 - Tight voltage margin between breakdown and clamping improves system-level overvoltage safety factor. |
| RoHS & halogen-free | Complies with IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for environmentally compliant manufacturing. |
| Steady-state power rating | 3 W at TL = 75°C - Supports continuous operation in thermally constrained environments with proper heatsinking. |
Applications
| Automotive Lighting Control | Industrial Sensor Interface |
|---|---|
Use Scenario: Protecting LED driver ICs from load-dump transients in 12V vehicle lighting systems. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VIN and GND to clamp positive surges exceeding 13.5V battery rail. Use Value: Limits clamped voltage to 14.4V, staying within typical automotive IC 16V absolute maximum rating while surviving 500W pulses. | Use Scenario: Shielding analog sensor outputs (e.g., 4–20mA transmitters) from EFT coupling on long cables. IC Role / Device Role / Timing Role: Placed across signal and ground lines to absorb sub-microsecond electrical fast transients without distorting DC output. Use Value: Sub-1ps response ensures clamping initiates before EFT edge reaches downstream op-amp inputs, preserving measurement accuracy. |
| Power Supply Input Protection | ESD-Sensitive Communication Port |
Use Scenario: Safeguarding DC-DC converter enable pins and feedback resistors from inductive kickback during relay switching. IC Role / Device Role / Timing Role: Connected from enable line to ground to shunt transient energy away from low-current control circuitry. Use Value: 1μA leakage at 8.5V prevents false triggering while 14.4V clamping protects CMOS input stages rated for 15V max. | Use Scenario: Adding secondary-level ESD protection on CAN or LIN bus lines where primary TVS is located upstream. IC Role / Device Role / Timing Role: Mounted directly at connector to divert human-body-model (HBM) and IEC 61000-4-2 contact discharge energy. Use Value: 500W rating handles 30kV air discharge events; DO-15 footprint allows placement within 2mm of I/O connector for optimal layout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ8.5A | Same 8.5V VWM, but SMA package (surface-mount); lower 400W PPK; 15V VC @ 32.1A. | Requires PCB rework for SMT assembly; less suitable for high-reliability through-hole designs or manual repair. | Choose SMAJ8.5A only when board space constraints mandate SMT and 400W rating suffices. |
| P6SMB8.5A | Same DO-214AA (SMB) package; identical VWM/VBR specs; 14.4V VC @ 36A; RoHS-compliant. | Surface-mount alternative with same clamping performance but different thermal pad requirements and mounting process. | Select P6SMB8.5A if SMB footprint aligns with existing layout and automated pick-and-place is preferred. |
Compared with SMAJ8.5A and P6SMB8.5A, the SA8.5A offers through-hole mechanical robustness, full 500W surge rating, and direct compatibility with legacy DO-15 tooling - making it optimal for automotive harness-connected modules where vibration resistance and serviceability matter.
Availability
SA8.5A is available at Aetrix Electronics and suitable for automotive lighting control, industrial sensor interface, and power supply input protection requiring stable component supply, long-term lifecycle assurance, and AEC-Q101-qualified variants.
Supply support for SA8.5A 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 MOSFETs for industrial and automotive markets.
The SA Series is designed specifically for high-energy transient suppression in harsh environments, emphasizing low clamping ratios, AEC-Q101 qualification paths, and consistent DO-204AC packaging across 5V–170V voltage grades.
FAQ
What is the polarity configuration of the SA8.5A?
The SA8.5A is a unidirectional TVS diode with cathode marked by a band on the DO-204AC body. It conducts only when cathode voltage exceeds anode voltage by ≥VBR, making it suitable for DC rail protection where reverse voltage is not expected. This differs from bidirectional variants like SA8.5CA, which lack polarity marking and suppress both polarities.
Does the SA8.5A meet AEC-Q101 qualification standards?
The base SA8.5A is not AEC-Q101 qualified; however, the SA8.5AH variant - identifiable by the "H" suffix in the ordering code - undergoes full AEC-Q101 stress testing including temperature cycling, high-temperature reverse bias, and ESD. Always verify the full part number (e.g., SA8.5AH) when automotive qualification is required.
What is the maximum clamping voltage of the SA8.5A under surge conditions?
The SA8.5A has a maximum clamping voltage (VC) of 14.4 V at 36 A peak pulse current (IPPM) under the standard 10/1000μs waveform. This value is guaranteed across the full operating temperature range and defines the upper voltage limit imposed on protected circuitry during transient events.
How does the SA8.5A compare to the SA8.5 in terms of electrical performance?
The SA8.5A offers tighter breakdown voltage tolerance (9.44–10.4 V) versus SA8.5 (9.44–11.5 V), lower clamping voltage (14.4 V vs. 15.9 V at same IPPM), and reduced leakage current specification. These improvements enhance protection margin and reduce risk of false triggering in precision voltage-sensitive applications.
What thermal mounting requirements apply to achieve the full 500W rating of the SA8.5A?
To sustain the rated 500W peak pulse power, the SA8.5A must be mounted with each lead soldered to a 10 × 10 mm copper pad on the PCB, per the datasheet's thermal derating curve (Fig.2). Without this copper area, power handling drops significantly - e.g., to ~300W with 5 × 5 mm pads - risking thermal runaway during repeated surges.
SA8.5A 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:
- 14.4V
- Current - Peak Pulse (10/1000µs):
- 36A
- Power - Peak Pulse:
- 500W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AC (DO-15)
SA8.5A FAQ
1.How can I place an order for SA8.5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SA8.5A 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 SA8.5A reliable?
The price and inventory of SA8.5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA8.5A is usually 5 days.
3.What payment methods are accepted for SA8.5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA8.5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA8.5A?
SA8.5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA8.5A 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 SA8.5A?
For technical support, including SA8.5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA8.5A requirements.
6.How does Aetrix verify that SA8.5A is sourced from the original manufacturer or authorized distributors?
All SA8.5A 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 SA8.5A meets industry standards.
7.What is the process for return or replacement of SA8.5A?
All SA8.5A units undergo pre-shipment inspection (PSI). If there is an issue with SA8.5A, 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 SA8.5A part is unused and in its original packaging.
Return procedure for SA8.5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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