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Vishay General Semiconductor - Diodes Division SMA6J8.5A-E3/61
- Part No.:
- SMA6J8.5A-E3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA6J8.5A-E3/61.pdf
- Description:
- TVS DIODE 8.5VWM 18.7VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,675
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Product details
Overview
SMA6J8.5A-E3/61 from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients on power and signal lines. It features a 8.5 V stand-off voltage (VWM), 9.4–10.4 V breakdown voltage (VBR at IT = 1 mA), 13.3 V maximum clamping voltage (VC at IPP = 45.1 A, 10/1000 μs), 600 W peak pulse power (10/1000 μs), and operates from –55 °C to +150 °C. It protects MOSFETs and ICs in industrial power supplies.
For engineers reviewing the SMA6J8.5A-E3/61 datasheet, SMA6J8.5A-E3/61 pinout, SMA6J8.5A-E3/61 application, or SMA6J8.5A-E3/61 equivalent, key selection criteria include unidirectional polarity, 13.3 V clamping at 45.1 A surge, SMA package thermal resistance (RθJA = 120 °C/W), 0.064 Ω dynamic resistance, and RoHS-compliant matte tin-plated leads solderable per J-STD-002.
Technical Context
This TVS diode operates as a voltage-clamping protection device triggered when reverse voltage exceeds its breakdown threshold (9.4–10.4 V). Its low dynamic resistance (0.064 Ω) ensures minimal voltage overshoot during transient events, while its 120 °C/W junction-to-ambient thermal resistance requires careful PCB copper pad design (5.0 mm × 5.0 mm per terminal) for sustained 4 W power dissipation at TA = 50 °C.
The SMA6J8.5A-E3/61 is rated for 4000 W peak pulse power under 8/20 μs waveform and supports 50 A non-repetitive forward surge current (8.3 ms half-sine). Its unidirectional polarity-marked by cathode band-and compliance with MSL level 1 (260 °C reflow) make it suitable for automated SMT assembly in high-reliability industrial and telecom systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - Maximum continuous reverse operating voltage before conduction begins; sets minimum system operating margin. |
| VBR (min/max) | 9.4 V / 10.4 V at IT = 1 mA - Confirmed breakdown range defining turn-on threshold under DC test conditions. |
| VC at IPP | 13.3 V at 45.1 A (10/1000 μs) - Clamped voltage seen by protected circuit during standardized surge; determines stress on downstream components. |
| PPPM (10/1000 μs) | 600 W - Peak transient energy handling capability for long-duration surges like inductive switch-off. |
| RD | 0.064 Ω - Dynamic resistance governing voltage rise slope during surge; lower value improves clamping precision. |
| TJ max. | +150 °C - Maximum junction temperature enabling operation in hot industrial environments without derating. |
| ID at VWM | 20 μA - Reverse leakage current at 8.5 V; low value minimizes standby power loss and avoids false triggering. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile plastic case meeting UL 94 V-0 flammability rating; matte tin-plated leads, cathode indicated by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / transient return path | Connected to ground or low-impedance return in unidirectional TVS configuration; must be routed with low-inductance path. |
| Cathode | Protected line connection / clamping node | Connected to line being protected (e.g., 12 V rail); clamps to anode when voltage exceeds VBR; marked by color band. |
Key Features
| Feature | Design Value |
|---|---|
| Unidirectional polarity | Enables precise clamping only on negative transients relative to cathode; eliminates ambiguity in DC-biased lines. |
| MSL Level 1 compliance | Supports lead-free reflow up to 260 °C peak without moisture-induced damage; eliminates bake requirements pre-assembly. |
| Low dynamic resistance (0.064 Ω) | Reduces clamping voltage overshoot under fast-rising transients, improving protection margin for sensitive 3.3 V or 5 V ICs. |
| Industrial-grade RoHS (E3 suffix) | Meets JESD 201 Class 2 whisker resistance and JEDEC J-STD-020 MSL 1; qualified for extended-life industrial deployments. |
| 5.0 mm × 5.0 mm copper pad layout | Validated thermal design enabling full 4 W power dissipation at TA = 50 °C; ensures reliability under repeated surge events. |
Applications
| Industrial Power Supply Protection | Automotive Body Control Module (BCM) |
|---|---|
|
Use Scenario: Protecting 12 V input rails of programmable logic controllers (PLCs) against load dump and relay coil flyback. IC Role / Device Role / Timing Role: Unidirectional TVS clamping transient overvoltage on DC input bus upstream of DC/DC converters and microcontrollers. Use Value: Limits voltage to ≤13.3 V during 45.1 A surges, preventing latch-up or gate oxide damage in downstream 12 V-rated MOSFETs and PMICs. |
Use Scenario: Safeguarding LIN bus transceivers and sensor interface ICs from ESD and battery reversal spikes in BCM subassemblies. IC Role / Device Role / Timing Role: Fast-response voltage clamp on 12 V supply line feeding LIN PHY and Hall-effect sensors. Use Value: Withstands 4000 W (8/20 μs) surges and maintains <20 μA leakage at 8.5 V, preserving signal integrity and sleep-mode current budgets. |
| Telecom Base Station DC Feeds | Consumer Appliance Motor Drive Inputs |
|
Use Scenario: Shielding 48 V backplane power inputs in remote radio units (RRUs) from lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Primary front-end transient suppressor on isolated 48 V DC feed before DC/DC isolation stage. Use Value: Delivers 600 W (10/1000 μs) clamping performance with 150 °C max junction rating, ensuring uptime in outdoor enclosures without active cooling. |
Use Scenario: Suppressing commutation spikes on BLDC motor driver H-bridge supply rails in smart washing machines and HVAC fans. IC Role / Device Role / Timing Role: Bidirectional-capable protection element (used unidirectionally) across motor phase inputs to absorb inductive kickback. Use Value: 50 A IFSM rating handles repetitive motor startup currents; 0.064 Ω RD minimizes voltage overshoot during rapid PWM switching transitions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA6J8.0A-E3/61 | Lower VWM (8.0 V), lower VBR (8.89–9.83 V), slightly higher clamping (12.5 V at 48.0 A). | Better suited for tighter 8 V nominal rails where 0.5 V additional margin is critical. | Select when system VCC tolerance is ±5 % around 8 V and clamping headroom below 12.5 V is required. |
| SMA6J9.0A-E3/61 | Higher VWM (9.0 V), higher VBR (10.0–11.1 V), higher clamping (14.0 V at 42.9 A). | Preferred for 9 V or 12 V systems with wider voltage tolerance and higher surge immunity needs. | Choose for 12 V automotive accessory circuits where 14.0 V clamping remains within safe operating area of downstream 16 V-rated FETs. |
Compared with SMA6J8.0A-E3/61 and SMA6J9.0A-E3/61, the SMA6J8.5A-E3/61 provides optimal balance for 9 V nominal systems-offering 0.5 V margin above 8.5 V VWM while maintaining 13.3 V clamping, making it ideal for industrial 9 V logic rails and legacy telecom interfaces requiring precise standoff control.
Availability
SMA6J8.5A-E3/61 is available at Aetrix Electronics and suitable for industrial power supply protection, automotive body control modules, and telecom base station DC feeds requiring stable component supply, RoHS-compliant packaging, and MSL Level 1 reflow compatibility.
Supply support for SMA6J8.5A-E3/61 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, TVS devices, and optoelectronics with emphasis on reliability, thermal performance, and AEC-Q200 qualification.
The SMA6J series is part of Vishay's Transient Voltage Suppressor portfolio, engineered for robust electrostatic and surge protection in harsh industrial, automotive, and telecom environments using optimized silicon junction design and DO-214AC packaging.
FAQ
What is the maximum clamping voltage of the SMA6J8.5A-E3/61 under standard test conditions?
The SMA6J8.5A-E3/61 has a maximum clamping voltage (VC) of 13.3 V when subjected to a 10/1000 μs surge waveform at a peak pulse current (IPP) of 45.1 A. This value is measured at TA = 25 °C with the device mounted on 5.0 mm × 5.0 mm copper pads per terminal. The SMA6J8.5A-E3/61 achieves this clamping performance due to its specified dynamic resistance of 0.064 Ω and tightly controlled breakdown voltage range of 9.4 V to 10.4 V.
Is the SMA6J8.5A-E3/61 suitable for automotive applications?
Yes, the SMA6J8.5A-E3/61 is suitable for automotive applications such as body control modules and LIN bus protection, provided the system voltage aligns with its 8.5 V stand-off rating. It meets MSL Level 1 reflow standards (260 °C peak), is RoHS-compliant (E3 suffix), and operates from –55 °C to +150 °C. While not AEC-Q200 qualified out-of-box, its industrial-grade construction and thermal robustness make it a common choice for non-safety-critical automotive subsystems where the SMA6J8.5A-E3/61 is deployed on 12 V supply rails with appropriate derating.
What does the "-E3/61" suffix indicate in SMA6J8.5A-E3/61?
The "-E3" suffix denotes Vishay's RoHS-compliant, industrial-grade variant with matte tin-plated leads and JESD 201 Class 2 whisker resistance. The "/61" indicates packaging in 7-inch diameter plastic tape and reel, with a base quantity of 1800 units per reel. This format ensures compatibility with high-speed pick-and-place equipment and supports automated SMT assembly of the SMA6J8.5A-E3/61 without manual handling or rework.
How does the SMA6J8.5A-E3/61 compare to bidirectional TVS diodes?
The SMA6J8.5A-E3/61 is unidirectional only, meaning it clamps transients in one polarity-reverse voltage applied to the cathode-while conducting forward current like a standard diode. Unlike bidirectional TVS devices, it cannot suppress positive-going transients on grounded lines. Its advantage lies in lower leakage (<20 μA at VWM) and sharper breakdown knee, making the SMA6J8.5A-E3/61 preferred for DC-biased power rails where polarity is fixed and low standby current is critical.
What PCB layout guidelines apply to the SMA6J8.5A-E3/61 for optimal thermal performance?
For optimal thermal performance, the SMA6J8.5A-E3/61 must be mounted on PCB copper pads measuring 5.0 mm × 5.0 mm per terminal, as specified in the Vishay datasheet. This layout achieves the rated 4 W power dissipation at TA = 50 °C and supports reliable operation under repetitive surge conditions. Smaller pads increase RθJA beyond the specified 120 °C/W, risking thermal runaway. The SMA6J8.5A-E3/61 also requires short, wide traces to minimize inductance between the device and protected node.
SMA6J8.5A-E3/61 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 8.5V
- Voltage - Breakdown (Min):
- 9.4V
- Voltage - Clamping (Max) @ Ipp:
- 18.7V
- Current - Peak Pulse (10/1000µs):
- 205A (8/20µs)
- Power - Peak Pulse:
- 4000W (4kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMA6J8.5A-E3/61 FAQ
1.How can I place an order for SMA6J8.5A-E3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA6J8.5A-E3/61 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 SMA6J8.5A-E3/61 reliable?
The price and inventory of SMA6J8.5A-E3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA6J8.5A-E3/61 is usually 5 days.
3.What payment methods are accepted for SMA6J8.5A-E3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA6J8.5A-E3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA6J8.5A-E3/61?
SMA6J8.5A-E3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA6J8.5A-E3/61 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 SMA6J8.5A-E3/61?
For technical support, including SMA6J8.5A-E3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA6J8.5A-E3/61 requirements.
6.How does Aetrix verify that SMA6J8.5A-E3/61 is sourced from the original manufacturer or authorized distributors?
All SMA6J8.5A-E3/61 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 SMA6J8.5A-E3/61 meets industry standards.
7.What is the process for return or replacement of SMA6J8.5A-E3/61?
All SMA6J8.5A-E3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMA6J8.5A-E3/61, 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 SMA6J8.5A-E3/61 part is unused and in its original packaging.
Return procedure for SMA6J8.5A-E3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMA6J8.5A-E3/61 Tags
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