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Vishay General Semiconductor - Diodes Division SMA6J8.5A-E3/5A
- Part No.:
- SMA6J8.5A-E3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA6J8.5A-E3/5A.pdf
- Description:
- TVS DIODE 8.5VWM 18.7VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,958
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Product details
Overview
SMA6J8.5A-E3/5A from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping transient overvoltages on power and signal lines. It features a 8.5 V stand-off voltage (VWM), 9.4–10.4 V breakdown voltage (VBR at 1 mA), 13.3 V maximum clamping voltage at 45.1 A (10/1000 μs), and 600 W peak pulse power rating. It protects MOSFETs, ICs, and sensor signal lines in industrial and telecom equipment.
For engineers reviewing the SMA6J8.5A-E3/5A datasheet, SMA6J8.5A-E3/5A pinout, SMA6J8.5A-E3/5A application, or SMA6J8.5A-E3/5A equivalent, key selection criteria include clamping voltage margin vs. protected device VDS/VCC, unidirectional polarity requirement, 600 W 10/1000 μs surge capability, and SMA package thermal performance under PCB pad derating.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: it remains high-impedance below VWM (8.5 V), avalanches sharply at VBR (9.4–10.4 V), and limits transient voltage to ≤13.3 V at 45.1 A (10/1000 μs). Its dynamic resistance is 0.064 Ω, enabling fast response to sub-microsecond transients.
Thermal design relies on its RθJA of 120 °C/W (on standard 5.0 mm × 5.0 mm pads) and maximum junction temperature of 150 °C. It meets J-STD-020 MSL Level 1 and JESD 201 Class 2 whisker resistance with matte tin-plated leads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - Maximum continuous reverse operating voltage before leakage exceeds 20 μA; sets upper limit for normal circuit operation. |
| VBR (min/max) | 9.4 V / 10.4 V at 1 mA - Confirmed avalanche onset range; ensures reliable triggering above system nominal voltage. |
| VC at IPP | 13.3 V at 45.1 A (10/1000 μs) - Clamped voltage during standardized surge; must stay below protected device's absolute maximum rating. |
| PPPM (10/1000 μs) | 600 W - Peak transient energy handling capacity; defines survivability against common inductive-switching surges. |
| ID at VWM | ≤20 μA - Reverse leakage current at 8.5 V; low enough to avoid loading sensitive 3.3 V or 5 V logic rails. |
| Package | SMA (DO-214AC) - Surface-mount outline with cathode band marking; compatible with automated placement and reflow up to 260 °C peak. |
| TJ max. | 150 °C - Maximum junction temperature; requires thermal pad layout per datasheet Fig. 2 for sustained 4 W dissipation at TA = 50 °C. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, UL 94 V-0 rated, cathode indicated by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction or transient clamping | Connected to lower-potential side (e.g., GND or return path); forms shunt path when reverse-biased transient exceeds VBR. |
| Cathode | Current exit terminal during clamping; marked with band | Connected to protected line (e.g., 8.5 V rail or signal); voltage referenced to anode during clamping event. |
Key Features
| Feature | Design Value |
|---|---|
| Clamping performance | 13.3 V VC at 45.1 A (10/1000 μs) with 0.064 Ω dynamic resistance - enables robust protection of 12 V systems with margin. |
| Automated assembly support | MSL Level 1 rating and 260 °C lead-free reflow compatibility - eliminates moisture sensitivity concerns in high-volume SMT lines. |
| Low leakage | ≤20 μA ID at 8.5 V - prevents unintended current draw in battery-powered or low-power sensor interfaces. |
| Thermal reliability | RθJA = 120 °C/W on 5 mm × 5 mm pads - allows predictable thermal modeling for continuous 4 W dissipation at 50 °C ambient. |
Applications
| Industrial Motor Control | Telecom Power Supply Input |
|---|---|
|
Use Scenario: Protection of gate drivers and microcontrollers against flyback spikes from relay coils and solenoid switching. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed across DC bus or control signal lines to clamp transients within 1 ns. Use Value: 13.3 V clamping voltage ensures safe operation below 15 V-rated gate drivers while surviving 600 W surges. |
Use Scenario: Input-stage surge suppression on 12 V telecom power supplies exposed to lightning-induced surges per IEC 61000-4-5. IC Role / Device Role / Timing Role: Primary-level transient suppressor mounted at board edge, upstream of DC/DC converters. Use Value: 4000 W peak power rating (8/20 μs) handles high-energy surges without degradation, validated per industry standards. |
| Automotive Body Control Module | Consumer Sensor Interface |
|
Use Scenario: Protection of LIN bus transceivers and MCU I/O pins against load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional TVS on 12 V supply rail and signal lines, leveraging SMA footprint for space-constrained modules. Use Value: 150 °C max junction temperature supports under-hood operation; RoHS-compliant E3 suffix meets automotive material requirements. |
Use Scenario: ESD and EFT protection for analog outputs of temperature/humidity sensors in smart home hubs. IC Role / Device Role / Timing Role: Low-leakage (≤20 μA) shunt device on 3.3 V or 5 V analog output lines to prevent offset drift. Use Value: 8.5 V VWM provides headroom above 5 V rail while maintaining tight clamping to preserve ADC accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA6J8.5CA-E3/5A | Bidirectional variant with symmetrical ±8.5 V standoff and same clamping (13.3 V) but dual-polarity response. | Required where AC-coupled or bidirectional signal lines (e.g., RS-485, USB D+/D−) need protection. | Select SMA6J8.5CA-E3/5A only if bidirectional transients are present; SMA6J8.5A-E3/5A is optimal for DC rails and unidirectional signals. |
| SMCJ8.5A-E3/57T | Same VWM/VBR/VC specs but in larger SMC (DO-214AB) package with 1500 W PPPM (10/1000 μs) and lower RθJA (60 °C/W). | Better suited for higher-power surges or thermally constrained environments requiring >600 W margin. | Choose SMCJ8.5A-E3/57T when PCB layout allows larger footprint and system-level surge testing exceeds 600 W. |
Compared with SMA6J8.5CA-E3/5A and SMCJ8.5A-E3/57T, the SMA6J8.5A-E3/5A offers optimal balance of compact SMA footprint, 600 W surge rating, and low-leakage unidirectional protection for cost-sensitive 12 V DC systems.
Availability
SMA6J8.5A-E3/5A is available at Aetrix Electronics and suitable for industrial motor control, telecom power input stages, and automotive body electronics requiring stable component supply with RoHS-compliant, high-reliability transient suppression.
Supply support for SMA6J8.5A-E3/5A 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
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, TVS devices, and optoelectronics with emphasis on reliability and application-specific performance.
The SMA6J series is part of Vishay's Transient Voltage Suppressor family, engineered for robust electrostatic discharge and surge protection in harsh industrial and automotive environments using silicon avalanche technology.
FAQ
What is the maximum clamping voltage of the SMA6J8.5A-E3/5A under a 10/1000 μs surge?
The SMA6J8.5A-E3/5A has a maximum clamping voltage (VC) of 13.3 V when subjected to a 45.1 A peak pulse current with a 10/1000 μs waveform. This value is measured per the test conditions specified in the Vishay datasheet Document Number 89460 and reflects worst-case clamping performance at TA = 25 °C on standard PCB pads.
Is the SMA6J8.5A-E3/5A suitable for protecting a 5 V microcontroller I/O line?
No - the SMA6J8.5A-E3/5A is not recommended for direct 5 V I/O protection because its 8.5 V stand-off voltage (VWM) exceeds typical 5 V logic rail tolerances, risking false triggering or insufficient margin. For 5 V lines, a lower-voltage TVS such as SMA6J5.0A-E3/5A (VWM = 5.0 V) is appropriate. The SMA6J8.5A-E3/5A targets 8–12 V systems.
Does the SMA6J8.5A-E3/5A have a bidirectional version?
Yes - the bidirectional counterpart is SMA6J8.5CA-E3/5A, which provides symmetrical ±8.5 V stand-off voltage and identical clamping performance (13.3 V at 45.1 A). The "C" in the part number denotes bidirectional configuration, while the SMA6J8.5A-E3/5A is strictly unidirectional with cathode-band polarity marking.
What is the thermal resistance junction-to-ambient for the SMA6J8.5A-E3/5A?
The SMA6J8.5A-E3/5A has a typical thermal resistance junction-to-ambient (RθJA) of 120 °C/W when mounted on the minimum recommended 5.0 mm × 5.0 mm copper pads per terminal, as defined in the Vishay datasheet. This value assumes natural convection and no additional heatsinking.
What does the "E3/5A" suffix indicate in SMA6J8.5A-E3/5A?
The "E3" denotes RoHS-compliant, industrial-grade construction with matte tin-plated leads meeting JESD 201 Class 2 whisker resistance. The "/5A" specifies packaging in 13-inch diameter plastic tape and reel containing 7500 units - distinct from the "/61" variant (7-inch reel, 1800 units).
SMA6J8.5A-E3/5A 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-E3/5A FAQ
1.How can I place an order for SMA6J8.5A-E3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA6J8.5A-E3/5A 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 SMA6J8.5A-E3/5A reliable?
The price and inventory of SMA6J8.5A-E3/5A 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-E3/5A is usually 5 days.
3.What payment methods are accepted for SMA6J8.5A-E3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA6J8.5A-E3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA6J8.5A-E3/5A?
SMA6J8.5A-E3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA6J8.5A-E3/5A 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 SMA6J8.5A-E3/5A?
For technical support, including SMA6J8.5A-E3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA6J8.5A-E3/5A requirements.
6.How does Aetrix verify that SMA6J8.5A-E3/5A is sourced from the original manufacturer or authorized distributors?
All SMA6J8.5A-E3/5A 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 SMA6J8.5A-E3/5A meets industry standards.
7.What is the process for return or replacement of SMA6J8.5A-E3/5A?
All SMA6J8.5A-E3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMA6J8.5A-E3/5A, 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 SMA6J8.5A-E3/5A part is unused and in its original packaging.
Return procedure for SMA6J8.5A-E3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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