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Vishay General Semiconductor - Diodes Division SA8.5AHE3/73
- Part No.:
- SA8.5AHE3/73
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA8.5AHE3/73.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,994
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Product details
Overview
SA8.5AHE3/73 from Vishay General Semiconductor is a unidirectional Transient Voltage Suppressor (TVS) diode in DO-15 package, designed for circuit protection against ESD and surge events. It features 8.5 V stand-off voltage (VWM), 9.44–10.4 V breakdown voltage (VBR) at 1 mA, 14.4 V clamping voltage (VC) at 10 A peak pulse current, 500 W peak pulse power (10/1000 μs), and AEC-Q101 qualification for automotive use.
For engineers reviewing the SA8.5AHE3/73 datasheet, SA8.5AHE3/73 pinout, SA8.5AHE3/73 application, or SA8.5AHE3/73 equivalent, this device is selected for robust overvoltage protection in DC power rails, sensor interfaces, and automotive control modules where fast response (<1 ns), low clamping ratio, and high surge reliability are required.
Technical Context
The SA8.5AHE3/73 operates as a unidirectional avalanche diode with glass-passivated junction, enabling sub-nanosecond response to transients. Its 14.4 V clamping voltage at 10 A IPPM ensures safe voltage limiting for downstream ICs such as microcontrollers and CAN transceivers during 10/1000 μs surges.
Thermal performance is defined by 175 °C max junction temperature and 3.0 W steady-state power dissipation on infinite heatsink at TL = 75 °C. The device meets JESD 201 Class 2 whisker resistance and RoHS compliance per HE3 suffix designation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - maximum continuous reverse operating voltage before clamping begins |
| VBR (min/max) | 9.44 V / 10.4 V at 1 mA - guaranteed avalanche initiation range for reliable turn-on threshold |
| VC @ IPPM | 14.4 V at 10 A - clamped voltage during 10/1000 μs surge, limiting stress on protected ICs |
| PPPM | 500 W - peak transient energy handling capability under standard 10/1000 μs waveform |
| ID @ VWM | 1.0 μA - ultra-low leakage ensuring minimal standby power loss in battery-powered systems |
| TJ max. | +175 °C - extended thermal rating supporting under-hood automotive environments |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD |
Pinout & Package
Package: DO-15 (DO-204AC) molded epoxy case with matte tin-plated leads; polarity indicated by cathode band on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to ground or low-side return path in unidirectional TVS configuration |
| Cathode | Clamping terminal | Connected to protected line (e.g., 12 V rail); color band marks this end for orientation |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Enables stable, repeatable avalanche characteristics and long-term reliability under repetitive surge stress |
| 500 W peak pulse power (10/1000 μs) | Withstands IEC 61000-4-5 Level 4 surges (4 kV) on 2 Ω source impedance without degradation |
| AEC-Q101 qualification | Validated for automotive applications including engine control units and body electronics |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., load dump, inductive switching) |
| RoHS-compliant HE3 suffix | Meets JESD 201 Class 2 whisker resistance and automotive material compliance requirements |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V supply lines in engine control modules from load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS clamps positive-going surges above 14.4 V while remaining high-impedance below 8.5 V. Use Value: Prevents latch-up or permanent damage to MCU power inputs during ISO 16750-2 pulse 5a/b events. | Use Scenario: Safeguarding analog outputs of pressure/temperature sensors in factory automation PLCs. IC Role / Device Role / Timing Role: Placed across sensor output and ground to shunt ESD (IEC 61000-4-2 ±8 kV contact) before reaching ADC input. Use Value: Maintains signal integrity with <1.0 μA leakage at 8.5 V, avoiding offset errors in precision measurement circuits. |
| Consumer USB Port ESD Protection | Telecom DC Feeder Line Surge Suppression |
Use Scenario: Secondary-level protection on 5 V USB VBUS lines in set-top boxes and smart displays. IC Role / Device Role / Timing Role: Fast-clamping unidirectional diode placed after primary common-mode choke and fuse. Use Value: Responds in <1 ns to meet IEC 61000-4-2 immunity requirements without affecting USB 2.0 signal rise time. | Use Scenario: Overvoltage suppression on -48 V DC telecom feeder lines exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Mounted between feed line and chassis ground to clamp negative transients up to 500 W. Use Value: Withstands repeated 10/1000 μs surges per GR-1089-CORE while maintaining <10.4 V VBR tolerance. |
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 package, but lower PPPM (400 W) and higher VC (14.4 V same) | Lower surge margin; suitable only for non-automotive consumer applications with derated surge exposure | Select SMAJ8.5A only when board space allows SMA package and AEC-Q101 is not required. |
| P6SMB8.5A | Same VWM and DO-214AA package; 600 W PPPM but 15.0 V VC at 10 A - 4% higher clamping voltage | Higher clamping increases risk of overvoltage stress on sensitive 3.3 V logic; requires layout review for thermal relief | Choose P6SMB8.5A only if higher peak power is prioritized over tight clamping and automotive qualification is unnecessary. |
Compared with SMAJ8.5A and P6SMB8.5A, the SA8.5AHE3/73 uniquely combines AEC-Q101 qualification, DO-15 through-hole mechanical robustness, and optimal 14.4 V clamping for 12 V system protection-making it preferred for automotive and industrial designs requiring traceable, high-reliability surge suppression.
Availability
SA8.5AHE3/73 is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor nodes, consumer power adapters, and telecom DC distribution systems requiring stable component supply and long-term lifecycle support.
Supply support for SA8.5AHE3/73 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 and automotive-grade validation.
The SAxxA series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-energy transient suppression in harsh environments including automotive, industrial, and telecom infrastructure.
FAQ
What is the clamping voltage of SA8.5AHE3/73 and how is it measured?
The SA8.5AHE3/73 has a maximum clamping voltage (VC) of 14.4 V at 10 A peak pulse current using the standardized 10/1000 μs double-exponential waveform. This value is measured per JEDEC standards and guarantees that protected circuitry will not experience more than 14.4 V during surge events, making SA8.5AHE3/73 suitable for safeguarding 12 V nominal systems. The clamping behavior is verified across temperature and production lots per the 88378 datasheet.
Is SA8.5AHE3/73 suitable for automotive applications?
Yes, SA8.5AHE3/73 is AEC-Q101 qualified and explicitly rated for automotive use per Vishay document 88378. Its construction-including glass-passivated junction, DO-15 mechanical robustness, and operation up to +175 °C junction temperature-meets requirements for engine control, body electronics, and infotainment power rails. The HE3 suffix confirms JESD 201 Class 2 whisker resistance and RoHS compliance required in automotive supply chains.
What does the "HE3" suffix mean in SA8.5AHE3/73?
The "HE3" suffix in SA8.5AHE3/73 indicates RoHS-compliant construction with AEC-Q101 qualification and JESD 201 Class 2 whisker resistance. Unlike base "E3" parts, HE3 devices undergo additional stress testing for automotive reliability, including temperature cycling, high-temperature reverse bias, and mechanical shock. This makes SA8.5AHE3/73 distinct from commercial-grade variants and appropriate for mission-critical automotive and industrial deployments.
How does SA8.5AHE3/73 compare to bidirectional TVS diodes like SA8.5CA?
SA8.5AHE3/73 is unidirectional and intended for DC line protection where polarity is fixed (e.g., +12 V rail to ground), offering tighter VBR tolerance and lower VF in forward conduction. In contrast, SA8.5CA is bidirectional and used for AC or floating signal lines. SA8.5AHE3/73 cannot replace SA8.5CA in symmetrical applications, and vice versa-selection depends strictly on circuit topology and surge polarity requirements defined in the system design.
What is the maximum leakage current of SA8.5AHE3/73 at its stand-off voltage?
The SA8.5AHE3/73 exhibits a maximum reverse leakage current (ID) of 1.0 μA at its rated stand-off voltage (VWM) of 8.5 V and TA = 25 °C. This ultra-low leakage ensures minimal power drain in always-on automotive modules and preserves accuracy in high-impedance sensor interfaces. Leakage remains below 5 μA up to 80 % of VWM across the full operating temperature range per the 88378 specification table.
SA8.5AHE3/73 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:
- 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):
- 34.7A
- Power - Peak Pulse:
- 500W
- Power Line Protection:
- No
- Applications:
- -
- 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)
SA8.5AHE3/73 FAQ
1.How can I place an order for SA8.5AHE3/73 through Aetrix?
Please submit a Request for Quotation (RFQ) for SA8.5AHE3/73 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 SA8.5AHE3/73 reliable?
The price and inventory of SA8.5AHE3/73 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA8.5AHE3/73 is usually 5 days.
3.What payment methods are accepted for SA8.5AHE3/73?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA8.5AHE3/73 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA8.5AHE3/73?
SA8.5AHE3/73 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA8.5AHE3/73 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 SA8.5AHE3/73?
For technical support, including SA8.5AHE3/73 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA8.5AHE3/73 requirements.
6.How does Aetrix verify that SA8.5AHE3/73 is sourced from the original manufacturer or authorized distributors?
All SA8.5AHE3/73 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 SA8.5AHE3/73 meets industry standards.
7.What is the process for return or replacement of SA8.5AHE3/73?
All SA8.5AHE3/73 units undergo pre-shipment inspection (PSI). If there is an issue with SA8.5AHE3/73, 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 SA8.5AHE3/73 part is unused and in its original packaging.
Return procedure for SA8.5AHE3/73:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SA8.5AHE3/73 Tags
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