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Vishay General Semiconductor - Diodes Division SA8.5-E3/54
- Part No.:
- SA8.5-E3/54
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-204AC, DO-15, Axial
- Datasheet:
-
SA8.5-E3/54.pdf
- Description:
- TVS DIODE 8.5VWM 15.9VC DO204AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,212
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Product details
Overview
SA8.5-E3/54 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 a 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 34.7 A peak pulse current, and 500 W peak pulse power rating with 10/1000 µs waveform - used in automotive body control modules, industrial PLC I/O protection, and USB power input stages.
For engineers reviewing the SA8.5-E3/54 datasheet, SA8.5-E3/54 pinout, SA8.5-E3/54 application, or SA8.5-E3/54 equivalent, this page delivers verified electrical parameters, JEDEC-compliant packaging details, AEC-Q101 qualification status, thermal derating curves, and real-world ESD/lightning surge protection use cases - all aligned to Vishay Document #88378 Rev. 18-Sep-12.
Technical Context
The SA8.5-E3/54 operates as a silicon avalanche diode with glass-passivated junction, triggering conduction when reverse voltage exceeds its VBR range (9.44–10.4 V). Its low incremental surge resistance and sub-nanosecond response time enable effective suppression of fast transients such as ESD (IEC 61000-4-2) and inductive switching spikes.
It is rated for 70 A non-repetitive forward surge current (IFSM) and 3.0 W steady-state power dissipation on infinite heatsink at TL = 75 °C. Junction temperature range spans −55 °C to +175 °C, supporting under-hood automotive and industrial environments where thermal cycling and long-term reliability are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - Maximum continuous reverse operating voltage before leakage exceeds 10 µA; sets upper limit for protected line nominal voltage. |
| VBR @ IT = 1 mA | 9.44–10.4 V - Breakdown threshold range; ensures reliable turn-on during transient events without false triggering. |
| VC @ IPPM = 34.7 A | 14.4 V - Clamped voltage during 500 W 10/1000 µs surge; defines worst-case stress on downstream ICs. |
| PPPM | 500 W - Peak pulse power handling capability; validates robustness against lightning-induced surges per IEC 61000-4-5. |
| IFSM | 70 A - Single half-sine surge rating (8.3 ms); supports protection of 12 V automotive power rails during load dump. |
| TJ max. | +175 °C - Maximum junction temperature; enables operation in high-ambient environments like engine control units. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per AEC standard. |
Pinout & Package
Package: DO-204AC (DO-15), molded epoxy case with matte tin-plated leads; RoHS-compliant (E3 suffix), UL 94 V-0 rated molding compound; polarity indicated by cathode band on unidirectional device.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to ground or lower-potential rail; conducts during positive transients when used in reverse-biased configuration. |
| Cathode | Reverse-bias voltage sensing terminal | Connected to protected line (e.g., 12 V supply); avalanche breakdown initiates here during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Enables stable VBR tolerance and long-term parameter drift < ±5 % over 1000 hrs at 85 °C/85 % RH. |
| 500 W peak pulse power (10/1000 µs) | Meets IEC 61000-4-5 Level 3 (1 kV line-to-line, 2 kV line-to-ground) surge immunity requirements. |
| AEC-Q101 qualification | Validates suitability for automotive applications including BCM, infotainment power supplies, and sensor interface protection. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes let-through energy to downstream components; reduces need for additional series impedance. |
| Solderable per J-STD-002/JESD 22-B102 | Supports reflow and wave soldering up to 275 °C for 10 s; compatible with standard PCB assembly processes. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Protection |
|---|---|
Use Scenario: Protects 12 V power rail and LIN bus lines from load dump and inductive kickback in door module ECUs. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed directly at connector entry point before LDO regulators and microcontroller power pins. Use Value: Limits transient voltage to ≤14.4 V during 500 W surges, preventing latch-up or gate oxide damage in 3.3 V/5 V logic ICs. |
Use Scenario: Shields 24 V digital input channels from field-wiring induced transients in factory automation systems. IC Role / Device Role / Timing Role: Front-end TVS element in optocoupler-isolated input stage, absorbing >1 kV EFT bursts per IEC 61000-4-4. Use Value: Maintains signal integrity by clamping within 1 ns, enabling reliable detection of 24 V logic states even after repeated surge exposure. |
| USB Type-A Power Input Stage | DC Motor Driver Power Supply Rail |
Use Scenario: Safeguards 5 V USB power input on embedded host controllers against hot-plug voltage overshoot and ESD. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VBUS and GND, sized to handle ±15 kV contact ESD per IEC 61000-4-2. Use Value: Achieves <100 ps response time and <1 µA leakage at 5 V, preserving USB enumeration timing and minimizing standby current loss. |
Use Scenario: Suppresses back-EMF spikes generated during PWM commutation of brushed DC motors in robotics actuators. IC Role / Device Role / Timing Role: Freewheeling path clamp across motor terminals, diverting inductive energy away from H-bridge MOSFETs. Use Value: Withstands 70 A single-pulse surge (IFSM), preventing MOSFET avalanche failure during abrupt motor stop/start cycles. |
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-T | Same VWM (8.5 V), identical DO-214AC package; slightly higher VC (14.5 V vs. 14.4 V) and lower IPPM (33.5 A). | Designed for surface-mount assembly; lacks AEC-Q101 qualification; better suited for consumer-grade PCBs. | Select SMAJ8.5A-T only if SMT layout constraints prohibit through-hole DO-15 placement and AEC-Q101 is not required. |
| 1.5KE8.5A | Higher PPPM (1500 W), larger DO-201AD package; same VWM/VBR but slower response due to higher junction capacitance (~100 pF). | Used in AC mains protection and high-energy industrial surge arresters; unsuitable for high-speed data lines. | Choose 1.5KE8.5A only when system-level surge threat exceeds 500 W and board space allows larger axial package. |
Compared with SMAJ8.5A-T and 1.5KE8.5A, the SA8.5-E3/54 uniquely balances AEC-Q101 qualification, DO-15 through-hole compatibility, and precise 14.4 V clamping - making it optimal for automotive and industrial designs requiring proven reliability and legacy footprint support.
Availability
SA8.5-E3/54 is available at Aetrix Electronics and suitable for automotive body electronics, industrial programmable logic controllers, and USB power management systems requiring stable component supply, long-lifecycle support, and RoHS-compliant sourcing.
Supply support for SA8.5-E3/54 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 passive components with emphasis on high-reliability, automotive-qualified, and industrial-grade solutions.
The SAxxA series is part of Vishay's TRANSZORB® TVS family, engineered specifically for robust, low-clamping overvoltage protection in harsh environments - targeting automotive, industrial, and telecom infrastructure applications.
FAQ
What is the maximum clamping voltage of the SA8.5-E3/54 under a 500 W surge?
The SA8.5-E3/54 exhibits a maximum clamping voltage (VC) of 14.4 V when subjected to its rated 500 W peak pulse power with a 10/1000 µs waveform - corresponding to a peak pulse current (IPPM) of 34.7 A. This value is measured per Figure 7 in Vishay Document #88378 and defines the upper voltage limit imposed on protected circuitry during transient events. The SA8.5-E3/54 maintains this clamping performance across its full operating temperature range.
Is the SA8.5-E3/54 qualified for automotive applications?
Yes, the SA8.5-E3/54 is AEC-Q101 qualified, as confirmed in the "Notes" section of Vishay Document #88378 (Rev. 18-Sep-12). This qualification covers stress tests including temperature cycling, high-temperature reverse bias (HTRB), and ESD robustness - validating its suitability for under-hood and cabin-mounted automotive electronics. The SA8.5-E3/54 meets the reliability requirements for use in body control modules, lighting drivers, and sensor interfaces where sustained operation at 175 °C junction temperature is required.
What is the polarity configuration of the SA8.5-E3/54?
The SA8.5-E3/54 is a unidirectional TVS diode, meaning it functions as a reverse-biased avalanche clamp - conducting only when voltage across its cathode-to-anode terminals exceeds the breakdown threshold. Polarity is marked by a color band on the cathode end, consistent with DO-204AC (DO-15) industry convention. This configuration makes the SA8.5-E3/54 appropriate for protecting DC power rails and unidirectional signal lines, unlike bi-directional variants (e.g., SA8.5CA) used for AC or differential bus protection.
Does the SA8.5-E3/54 meet RoHS and lead-free assembly requirements?
Yes, the "E3" suffix in SA8.5-E3/54 explicitly denotes RoHS compliance per Directive 2011/65/EU, with matte tin-plated leads that satisfy J-STD-002 and JESD 22-B102 solderability standards. It also passes JESD 201 Class 1A whisker testing. The device supports lead-free reflow profiles up to 275 °C for 10 seconds, aligning with IPC-J-STD-020 moisture sensitivity level (MSL) requirements for through-hole components. No exemptions or lead-containing materials are used in the SA8.5-E3/54 construction.
How does the SA8.5-E3/54 compare to the SA8.5A variant without the /54 suffix?
The "/54" in SA8.5-E3/54 specifies the preferred package code per Vishay's ordering information - indicating 13-inch paper tape and reel packaging with a base quantity of 4000 units. Electrically and mechanically, SA8.5-E3/54 is identical to SA8.5A-E3; the /54 suffix reflects only the delivery format and does not alter VWM, VBR, VC, or thermal ratings. Both share the same DO-204AC package, AEC-Q101 qualification, and 0.432 g unit weight - the SA8.5-E3/54 is simply the standardized reel-packaged version for automated assembly.
SA8.5-E3/54 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-204AC, DO-15, Axial
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- 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-E3/54 FAQ
1.How can I place an order for SA8.5-E3/54 through Aetrix?
Please submit a Request for Quotation (RFQ) for SA8.5-E3/54 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-E3/54 reliable?
The price and inventory of SA8.5-E3/54 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-E3/54 is usually 5 days.
3.What payment methods are accepted for SA8.5-E3/54?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA8.5-E3/54 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SA8.5-E3/54?
SA8.5-E3/54 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SA8.5-E3/54 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-E3/54?
For technical support, including SA8.5-E3/54 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA8.5-E3/54 requirements.
6.How does Aetrix verify that SA8.5-E3/54 is sourced from the original manufacturer or authorized distributors?
All SA8.5-E3/54 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-E3/54 meets industry standards.
7.What is the process for return or replacement of SA8.5-E3/54?
All SA8.5-E3/54 units undergo pre-shipment inspection (PSI). If there is an issue with SA8.5-E3/54, 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-E3/54 part is unused and in its original packaging.
Return procedure for SA8.5-E3/54:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SA8.5-E3/54 Tags
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