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Vishay General Semiconductor - Diodes Division SMA6J8.5A-M3/5A
- Part No.:
- SMA6J8.5A-M3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA6J8.5A-M3/5A.pdf
- Description:
- TVS DIODE 8.5VWM 13.3VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,592
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Product details
Overview
SMA6J8.5A-M3/5A 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 at 45.1 A (10/1000 μs), 600 W peak pulse power rating, and operates across -55 °C to +150 °C junction temperature range - deployed in sensor signal line protection for industrial control systems.
For engineers reviewing the SMA6J8.5A-M3/5A datasheet, SMA6J8.5A-M3/5A pinout, SMA6J8.5A-M3/5A application, or SMA6J8.5A-M3/5A equivalent, key selection criteria include clamping voltage vs. surge current, unidirectional polarity compatibility with DC-biased lines, thermal resistance (RθJA = 120 °C/W), M3 halogen-free RoHS compliance, and PCB pad layout requirements per DO-214AC footprint.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: under normal bias (≤8.5 V), it exhibits ≤20 μA reverse leakage; during transient events, it avalanches at 9.4–10.4 V and clamps to ≤13.3 V at 45.1 A (10/1000 μs waveform). Its dynamic resistance is 0.064 Ω, enabling fast response to ESD and inductive switching surges.
Designed for surface-mount assembly on standard PCBs, SMA6J8.5A-M3/5A uses matte tin-plated leads compliant with J-STD-002 and JESD 22-B102, meets MSL level 1 per J-STD-020, and supports reflow up to 260 °C peak. The cathode band denotes polarity, and its DO-214AC package requires 5.0 mm × 5.0 mm copper pads per terminal for rated power dissipation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - Maximum continuous reverse operating voltage before significant leakage; sets upper limit for protected line DC bias. |
| VBR (min/max) | 9.4 V / 10.4 V at 1 mA - Confirmed avalanche initiation range; ensures reliable turn-on above nominal system voltage. |
| VC at IPPM | 13.3 V at 45.1 A (10/1000 μs) - Clamped voltage seen by downstream ICs during standardized surge; defines worst-case stress on protected circuitry. |
| PPPM (10/1000 μs) | 600 W - Peak transient energy handling capability under industry-standard long-duration surge waveform. |
| ID at VWM | ≤20 μA - Low leakage preserves signal integrity and minimizes standby power loss in high-impedance circuits. |
| RθJA | 120 °C/W - Thermal resistance from junction to ambient; determines required PCB copper area for thermal management at 4 W PD. |
| Polarity | Unidirectional - Suitable only for DC-biased lines where reverse conduction must be blocked; not for AC or bidirectional data lines. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, halogen-free, RoHS-compliant, M3 suffix. Cathode indicated by color band. Requires 5.0 mm × 5.0 mm copper pads per terminal per datasheet derating guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current sink path during avalanche | Connected to protected line; conducts surge current to ground when clamping threshold exceeded. |
| Cathode | Reference node / voltage sensing point | Marked with band; tied to system ground or lower-potential rail; defines polarity and clamping reference. |
Key Features
| Feature | Design Value |
|---|---|
| Clamping performance | 13.3 V max VC at 45.1 A (10/1000 μs) enables robust protection of 3.3 V/5 V logic interfaces without overvoltage damage. |
| Low dynamic resistance | 0.064 Ω limits voltage overshoot during fast-rising transients, improving suppression fidelity for sub-microsecond ESD events. |
| Halogen-free M3 construction | Meets IEC 61249-2-21 and JEDEC J-STD-208; eliminates brominated flame retardants while maintaining UL 94 V-0 flammability rating. |
| MSL Level 1 reliability | Rated for floor life unlimited at ≤30 °C/85 % RH; supports standard SMT reflow without baking preconditioning. |
| Industrial temperature range | -55 °C to +150 °C TJ operation supports deployment in motor drives, outdoor sensors, and automotive under-hood modules. |
Applications
| Industrial Sensor Signal Protection | DC Power Rail Surge Suppression |
|---|---|
|
Use Scenario: Protecting analog output lines (e.g., 4–20 mA current loops) in factory-floor pressure/temperature sensors exposed to relay coil kickback and EMI. IC Role / Device Role / Timing Role: Shunt clamping device placed between signal line and ground, activated within nanoseconds of overvoltage event. Use Value: Limits transient voltage to ≤13.3 V, preventing damage to precision DACs and op-amps while maintaining <20 μA leakage at 8.5 V nominal bias. |
Use Scenario: Safeguarding 12 V DC input rails in programmable logic controllers (PLCs) against load dump and inductive switching spikes. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main power entry, coordinated with upstream fuse and bulk capacitance. Use Value: Absorbs 600 W (10/1000 μs) surges without degradation, sustaining 50 A IFSM for short-circuit fault conditions. |
| Automotive Body Control Module Inputs | Consumer Appliance Motor Driver Protection |
|
Use Scenario: Shielding microcontroller GPIOs connected to door lock actuators and window switches from battery line transients in 12 V vehicle systems. IC Role / Device Role / Timing Role: Unidirectional TVS placed directly at connector interface, referenced to chassis ground. Use Value: Meets ISO 7637-2 Pulse 1/2a immunity requirements with verified clamping at 13.3 V and low RD = 0.064 Ω. |
Use Scenario: Guarding gate drive signals of MOSFET half-bridges in washing machine motor inverters against cross-conduction-induced voltage spikes. IC Role / Device Role / Timing Role: Localized clamping element mounted adjacent to power stage, minimizing trace inductance. Use Value: Enables compact DO-214AC placement with 120 °C/W RθJA, allowing thermal design with minimal copper area on cost-sensitive consumer PCBs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA6J8.5A-E3/5A | Same electrical specs; RoHS-compliant but contains brominated flame retardants (non-halogen-free). | Acceptable where halogen-free mandate does not apply (e.g., non-EU industrial equipment). | Select E3 if halogen content is unrestricted and cost sensitivity outweighs green-material requirements. |
| SMCJ8.5A-M3 | Higher 1500 W PPPM (10/1000 μs); larger SMC (DO-214AB) package; same VWM/VBR/VC specs. | Better suited for higher-energy surges (e.g., telecom lightning protection), but requires larger PCB area. | Choose SMCJ8.5A-M3 only when surge energy exceeds 600 W and board space permits DO-214AB footprint. |
Compared with SMA6J8.5A-E3/5A, the M3 variant adds halogen-free compliance without sacrificing electrical performance; versus SMCJ8.5A-M3, SMA6J8.5A-M3/5A trades surge capacity for compact DO-214AC size - optimal for space-constrained 12 V sensor nodes and embedded controllers.
Availability
SMA6J8.5A-M3/5A is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body electronics, and consumer appliance power stages requiring stable component supply with halogen-free compliance and MSL Level 1 manufacturability.
Supply support for SMA6J8.5A-M3/5A 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, MOSFETs, and protection devices with emphasis on reliability, thermal performance, and AEC-Q200 qualification.
The SMA6J series targets cost-effective, surface-mount transient suppression for industrial and automotive subsystems where DO-214AC footprint, unidirectional clamping, and halogen-free compliance are mandatory design constraints.
FAQ
What is the maximum clamping voltage of the SMA6J8.5A-M3/5A under a 10/1000 μs surge?
The SMA6J8.5A-M3/5A 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 voltage stress imposed on protected circuitry during standardized surge events. The SMA6J8.5A-M3/5A maintains this clamping performance across its full operating temperature range.
Does the SMA6J8.5A-M3/5A support bidirectional transient suppression?
No, the SMA6J8.5A-M3/5A is a unidirectional TVS diode and is not rated for bidirectional operation. Its electrical characteristics - including breakdown voltage, clamping behavior, and leakage current - are defined only for reverse-bias (cathode-positive) conditions. Using SMA6J8.5A-M3/5A on AC-coupled or bidirectional signal lines would result in improper clamping and potential device failure. For such applications, a dedicated bidirectional TVS like SMBJ8.5CA-M3 must be selected.
What is the thermal resistance and power derating behavior of the SMA6J8.5A-M3/5A?
The SMA6J8.5A-M3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on the recommended 5.0 mm × 5.0 mm copper pads per terminal. Its power dissipation (PD) is rated at 4.0 W at TA = 50 °C and derates linearly above that temperature, reaching zero at +150 °C junction temperature. This derating curve is documented in Figure 2 of the Vishay datasheet and must be applied in thermal design to ensure SMA6J8.5A-M3/5A remains within safe operating limits under sustained surge duty cycles.
How does the M3 suffix differ from E3 in the SMA6J8.5A-M3/5A part number?
The M3 suffix in SMA6J8.5A-M3/5A indicates halogen-free, RoHS-compliant construction using bromine- and chlorine-free flame retardants, while E3 denotes RoHS compliance without halogen-free assurance. Both share identical electrical specifications, DO-214AC packaging, and MSL Level 1 rating. The SMA6J8.5A-M3/5A meets JEDEC J-STD-208 and IEC 61249-2-21 standards, making it suitable for environmentally regulated markets where halogen content is restricted.
What PCB pad layout is required to achieve the rated 600 W peak pulse power for the SMA6J8.5A-M3/5A?
To achieve the full 600 W peak pulse power rating (10/1000 μs) for the SMA6J8.5A-M3/5A, Vishay specifies mounting on PCB copper pads measuring 5.0 mm × 5.0 mm per terminal, as stated in Note (2) of the datasheet. Smaller pads reduce thermal mass and increase junction temperature during surge events, causing premature thermal runaway and de-rating of PPPM. The SMA6J8.5A-M3/5A's DO-214AC outline drawing confirms pad dimensions compatible with standard IPC-7351B footprints for SMA packages.
SMA6J8.5A-M3/5A 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:
- 13.3V
- Current - Peak Pulse (10/1000µs):
- 45.1A
- Power - Peak Pulse:
- 600W
- 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-M3/5A FAQ
1.How can I place an order for SMA6J8.5A-M3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA6J8.5A-M3/5A 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-M3/5A reliable?
The price and inventory of SMA6J8.5A-M3/5A 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-M3/5A is usually 5 days.
3.What payment methods are accepted for SMA6J8.5A-M3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA6J8.5A-M3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA6J8.5A-M3/5A?
SMA6J8.5A-M3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA6J8.5A-M3/5A 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-M3/5A?
For technical support, including SMA6J8.5A-M3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA6J8.5A-M3/5A requirements.
6.How does Aetrix verify that SMA6J8.5A-M3/5A is sourced from the original manufacturer or authorized distributors?
All SMA6J8.5A-M3/5A 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-M3/5A meets industry standards.
7.What is the process for return or replacement of SMA6J8.5A-M3/5A?
All SMA6J8.5A-M3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMA6J8.5A-M3/5A, 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-M3/5A part is unused and in its original packaging.
Return procedure for SMA6J8.5A-M3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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