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Vishay General Semiconductor - Diodes Division SA8.5-E3/73
- Part No.:
- SA8.5-E3/73
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA8.5-E3/73.pdf
- Description:
- TVS DIODE 8.5VWM 15.9VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,081
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Product details
Overview
SA8.5-E3/73 from Vishay General Semiconductor is a unidirectional Transient Voltage Suppressor (TVS) diode in DO-204AC (DO-15) package, designed for primary overvoltage protection of DC power rails and signal lines. It features 500 W peak pulse power (10/1000 μs), 8.5 V stand-off voltage (VWM), 9.44–10.4 V breakdown voltage (VBR at 1 mA), 14.4 V maximum clamping voltage (VC) at 10 A IPPM, and AEC-Q101 qualification for automotive-grade reliability.
For engineers reviewing the SA8.5-E3/73 datasheet, SA8.5-E3/73 pinout, SA8.5-E3/73 application, or SA8.5-E3/73 equivalent, this device serves as a robust, RoHS-compliant, lead-free transient protector for 12 V automotive subsystems, industrial sensor interfaces, and low-voltage DC power inputs where fast response (<1 ns), low clamping ratio, and stable junction temperature up to +175 °C are required.
Technical Context
The SA8.5-E3/73 operates as a unidirectional avalanche diode with glass-passivated junction, enabling precise voltage clamping during ESD or inductive switching transients. Its 10/1000 μs waveform rating reflects standardized surge immunity testing per IEC 61000-4-5, and its 0.01 % duty cycle limit ensures thermal stability under repetitive surges.
Designed for placement across protected lines and ground, it conducts only when reverse voltage exceeds VBR, limiting downstream voltage to ≤14.4 V at 10 A peak pulse current. The device's 3.0 W steady-state power dissipation and -55 °C to +175 °C operating range support use in harsh environments without heatsinking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - Maximum continuous reverse working voltage before conduction begins; sets safe operating margin for 12 V nominal systems. |
| VBR (min/max) | 9.44 V / 10.4 V at 1 mA - Confirmed breakdown threshold defining turn-on precision and tolerance band for clamping consistency. |
| VC @ IPPM | 14.4 V at 10 A - Measured clamping voltage under 10/1000 μs surge; determines worst-case voltage seen by protected ICs. |
| PPPM | 500 W - Peak pulse power handling capacity; defines survivability against standard lightning/surge waveforms. |
| IFSM | 70 A - Non-repetitive forward surge current rating; supports high-energy inrush or fault conditions without failure. |
| TJ max. | +175 °C - Maximum junction temperature; enables operation in under-hood automotive or industrial enclosures. |
| Package | DO-204AC (DO-15) - Standard axial-leaded through-hole package with matte tin-plated leads, UL 94 V-0 molding compound. |
Pinout & Package
DO-204AC (DO-15) package: axial-leaded, molded epoxy case with cathode band marking on one end. Leads are matte tin-plated, solderable per J-STD-002 and JESD 22-B102, rated for 275 °C dip soldering (10 s max). Polarity is unidirectional; cathode band denotes the terminal connected to circuit ground during normal operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Positive-side connection in unidirectional configuration | Connected to protected line (e.g., 12 V rail); conducts during reverse-biased overvoltage events. |
| Cathode (banded end) | Ground-reference terminal | Connected to system ground; establishes reference for clamping action and defines polarity-sensitive placement. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated chip junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity stress. |
| 500 W peak pulse power (10/1000 μs) | Meets IEC 61000-4-5 Level 3/4 surge immunity requirements for industrial and automotive electronics. |
| AEC-Q101 qualified | Validated for automotive applications including engine control units, body electronics, and infotainment power supplies. |
| Low incremental surge resistance | Minimizes VC – VBR differential (≤4.96 V), reducing voltage overshoot during fast transients. |
| RoHS-compliant, E3 suffix | Meets JEDEC JESD201 Class 1A whisker resistance and EU Directive 2011/65/EU hazardous substance restrictions. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V supply inputs to ECUs, lighting modules, and ADAS sensors from load-dump and alternator ripple transients. IC Role / Device Role / Timing Role: Primary clamping element placed between battery rail and local regulator input, responding within <1 ns to suppress spikes above 8.5 V. Use Value: Limits transient voltage to ≤14.4 V at 10 A, preventing damage to downstream LDOs and microcontrollers while maintaining AEC-Q101 compliance. | Use Scenario: Safeguarding analog outputs and digital communication lines (e.g., 4–20 mA, RS-485) in PLC I/O modules exposed to field wiring surges. IC Role / Device Role / Timing Role: Unidirectional shunt protector mounted at connector entry point, conducting only during negative-going transients on grounded-signal configurations. Use Value: Provides repeatable clamping performance across -55 °C to +175 °C, ensuring uptime in factory-floor environments with minimal derating. |
| Consumer DC Adapter Input Protection | Telecom Power Supply Surge Suppression |
Use Scenario: Securing 5–12 V DC inputs of set-top boxes, routers, and smart home hubs against AC adapter fault transients and ESD coupling. IC Role / Device Role / Timing Role: First-line defense in series with input fuse and parallel to bulk capacitor, absorbing energy before it reaches primary regulation stage. Use Value: Delivers 500 W pulse handling in compact DO-15 form factor, enabling cost-effective board-level protection without redesign. | Use Scenario: Clamping induced surges on -48 V telecom rectifier outputs caused by lightning-induced ground potential rise or cable discharge events. IC Role / Device Role / Timing Role: Reverse-biased TVS across output and return, activated only when voltage exceeds 8.5 V, diverting surge current to chassis ground. Use Value: Maintains 3.0 W steady-state dissipation capability and UL 94 V-0 flammability rating for safety-critical telecom infrastructure. |
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 VWM (8.5 V), identical DO-214AC (SMA) package; slightly higher VC (14.5 V) and lower IPPM (9.5 A). | Suitable for space-constrained SMT designs; not drop-in compatible due to surface-mount vs. through-hole footprint. | Select SMAJ8.5A only when PCB layout supports SMA package and thermal management allows for reduced peak current rating. |
| 1N6107 | Legacy unidirectional TVS with VWM = 8.5 V but lower PPPM (300 W), higher VC (15.0 V), and no AEC-Q101 qualification. | Acceptable for non-automotive commercial applications where qualification and 500 W margin are not required. | Choose 1N6107 only for cost-sensitive, non-automotive legacy designs where full 500 W surge headroom is unnecessary. |
Compared with SMAJ8.5A and 1N6107, SA8.5-E3/73 offers superior automotive qualification, higher surge power margin, and proven reliability in through-hole mounting-making it optimal for new designs requiring AEC-Q101 compliance and robust mechanical retention.
Availability
SA8.5-E3/73 is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface protection, and telecom power supply surge suppression requiring stable component supply, long-lifecycle availability, and traceable sourcing.
Supply support for SA8.5-E3/73 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
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SAxxA series is part of Vishay's TRANSZORB® TVS family, engineered specifically for high-energy transient suppression in automotive, industrial, and telecom systems where precise clamping, fast response, and AEC-Q101 validation are mandatory.
FAQ
What is the maximum clamping voltage of SA8.5-E3/73 at its rated peak pulse current?
The SA8.5-E3/73 has a maximum clamping voltage (VC) of 14.4 V at 10 A peak pulse current (IPPM) under the standard 10/1000 μs waveform. This value is measured and guaranteed per Vishay Document Number 88378, ensuring predictable overvoltage limiting for protected circuits. The SA8.5-E3/73 maintains this clamping performance across its full operating temperature range.
Is SA8.5-E3/73 suitable for automotive applications?
Yes, SA8.5-E3/73 is AEC-Q101 qualified and explicitly rated for automotive use, including engine control units, body electronics, and ADAS power domains. Its DO-204AC package, -55 °C to +175 °C operating range, and glass-passivated junction meet stringent automotive reliability requirements. The SA8.5-E3/73 data sheet confirms qualification status in the Mechanical Data section.
What does the "E3" suffix indicate in SA8.5-E3/73?
The "E3" suffix in SA8.5-E3/73 denotes RoHS-compliant, commercial-grade construction with matte tin-plated leads meeting J-STD-002 solderability and JESD 201 Class 1A whisker resistance. It distinguishes the part from HE3 (AEC-Q101 qualified) variants and confirms compliance with EU Directive 2011/65/EU. The SA8.5-E3/73 datasheet specifies E3 as base P/N-E3 for commercial grade.
How does SA8.5-E3/73 differ from bi-directional TVS diodes like SA8.5CA?
SA8.5-E3/73 is unidirectional and features a cathode band for polarity-sensitive placement, whereas SA8.5CA is bi-directional with no polarity marking and symmetrical clamping in both directions. SA8.5-E3/73 offers lower leakage at VWM (1.0 μA vs. 600 μA for SA5.0CA), making it preferred for DC rail protection. The SA8.5-E3/73 datasheet confirms uni-directional operation in the PRIMARY CHARACTERISTICS table.
What is the steady-state power dissipation rating for SA8.5-E3/73?
The SA8.5-E3/73 has a steady-state power dissipation (PD) rating of 3.0 W at lead temperature (TL) = 75 °C, as specified in the MAXIMUM RATINGS table. This rating applies under infinite heatsink conditions and must be derated linearly above 75 °C per the Steady State Power Derating Curve (Fig. 5) in the SA8.5-E3/73 datasheet.
SA8.5-E3/73 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-204AC, DO-15, Axial
- Series:
- TransZorb®
- Packaging:
- Tape & Box (TB)
- Product Status:
- Obsolete
- 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):
- 31.4A
- 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)
SA8.5-E3/73 FAQ
1.How can I place an order for SA8.5-E3/73 through Aetrix?
Please submit a Request for Quotation (RFQ) for SA8.5-E3/73 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-E3/73 reliable?
The price and inventory of SA8.5-E3/73 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-E3/73 is usually 5 days.
3.What payment methods are accepted for SA8.5-E3/73?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA8.5-E3/73 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA8.5-E3/73?
SA8.5-E3/73 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA8.5-E3/73 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-E3/73?
For technical support, including SA8.5-E3/73 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA8.5-E3/73 requirements.
6.How does Aetrix verify that SA8.5-E3/73 is sourced from the original manufacturer or authorized distributors?
All SA8.5-E3/73 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-E3/73 meets industry standards.
7.What is the process for return or replacement of SA8.5-E3/73?
All SA8.5-E3/73 units undergo pre-shipment inspection (PSI). If there is an issue with SA8.5-E3/73, 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-E3/73 part is unused and in its original packaging.
Return procedure for SA8.5-E3/73:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SA8.5-E3/73 Tags
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