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Vishay General Semiconductor - Diodes Division SMA6J8.5AHM3/5A
- Part No.:
- SMA6J8.5AHM3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA6J8.5AHM3/5A.pdf
- Description:
- TVS DIODE 8.5VWM 13.3VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,072
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Product details
Overview
SMA6J8.5AHM3/5A 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 - used for protecting MOSFETs, ICs, and sensor signal lines in industrial and telecom equipment.
For engineers reviewing the SMA6J8.5AHM3/5A datasheet, SMA6J8.5AHM3/5A pinout, SMA6J8.5AHM3/5A application, or SMA6J8.5AHM3/5A equivalent, key selection criteria include unidirectional polarity, 13.3 V clamping performance at 45.1 A surge, SMA package thermal resistance (RθJA = 120 °C/W), 0.064 Ω dynamic resistance, and halogen-free RoHS-compliant construction per M3 suffix.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds VBR (9.4–10.4 V), it avalanches to limit transient energy by diverting current to ground. Its low dynamic resistance (0.064 Ω) ensures minimal voltage overshoot during fast 10/1000 μs surges up to 45.1 A.
Designed for PCB-level protection, it mounts on 5.0 mm × 5.0 mm copper pads per terminal, meets J-STD-020 MSL Level 1 (260 °C reflow), and maintains stable clamping across -55 °C to +150 °C with αT = 7.3 × 10⁻⁴ /°C temperature coefficient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - maximum continuous reverse operating voltage before conduction begins |
| VBR (min/max) | 9.4 V / 10.4 V at 1 mA - precise avalanche initiation threshold for reliable triggering |
| VC at IPPM | 13.3 V at 45.1 A (10/1000 μs) - clamping voltage limiting downstream circuit stress |
| PPPM (10/1000 μs) | 600 W - surge energy handling capability under standard lightning waveform |
| ID at VWM | 20 μA max - low leakage preserves signal integrity and power efficiency |
| RθJA | 120 °C/W - thermal resistance defining junction-to-ambient temperature rise under 4 W dissipation |
| Polarity | Unidirectional - protects against positive transients only; cathode marked by band |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, halogen-free, RoHS-compliant, matte tin-plated leads, MSL Level 1, 260 °C peak reflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry during forward bias; grounded reference in unidirectional TVS configuration | Connected to protected line's low-side or ground return path for transient shunting |
| Cathode | Current exit during reverse avalanche; marked by color band | Connected to the line being protected (e.g., VCC or signal trace) to clamp overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile SMA package | Enables high-density PCB layouts and compatibility with automated SMT assembly lines |
| Clamping voltage ≤ 13.3 V at 45.1 A | Ensures downstream ICs rated for ≤15 V logic rails remain within safe operating limits |
| Dynamic resistance = 0.064 Ω | Minimizes voltage overshoot during fast transients, improving protection fidelity |
| Halogen-free, M3 suffix | Meets environmental compliance requirements for industrial and telecom end equipment |
| MSL Level 1 rating | Supports single-reflow manufacturing without moisture sensitivity concerns |
Applications
| Industrial Motor Drive Control | Automotive Body Control Module (BCM) Power Inputs |
|---|---|
Use Scenario: Protection of microcontroller I/O and gate drivers from inductive kickback during relay or solenoid switching. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between 12 V supply rail and ground near load switch. Use Value: Clamps 13.3 V at 45.1 A, preventing latch-up or oxide damage to 16 V-rated MCU pins and MOSFET gates. |
Use Scenario: Guarding LIN bus transceiver power pins against load dump and jump-start surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 12 V input rail upstream of LDO regulator. Use Value: Withstands 600 W (10/1000 μs) pulses while maintaining <20 μA leakage at 8.5 V, preserving sleep-mode current budget. |
| Telecom Base Station Sensor Interface | Consumer Appliance Mainboard Power Sequencing |
Use Scenario: Shielding analog sensor signal lines (e.g., temperature, humidity) from ESD and nearby RF switching noise. IC Role / Device Role / Timing Role: Low-capacitance TVS placed directly at connector entry point before signal conditioning op-amp. Use Value: 0.064 Ω RD enables sub-100 ns response, suppressing >8 kV HBM ESD events without distorting mV-level sensor outputs. |
Use Scenario: Safeguarding PMIC enable inputs and reset lines during AC power-on surge events. IC Role / Device Role / Timing Role: Standoff-rated (8.5 V) protector on 5 V or 3.3 V control rails feeding power management ICs. Use Value: Breakdown tolerance (9.4–10.4 V) avoids false triggering during nominal 5 V rail tolerances while clamping >12 V transients. |
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 not halogen-free (E3 vs. M3) | Acceptable where halogen-free requirement is not mandated (e.g., non-EU consumer goods) | Select E3 if cost-sensitive and halogen-free certification is unnecessary |
| SMB6J8.5A-M3/5A | Identical VWM/VBR/VC ratings but in larger SMB (DO-214AA) package; RθJA = 90 °C/W | Better thermal performance under sustained surge duty; requires larger PCB footprint | Choose SMB version when derating for >50 °C ambient or repetitive surge exposure |
Compared with SMA6J8.5AHM3/5A, the E3 variant trades halogen-free compliance for lower cost without electrical change, while the SMB6J8.5A-M3/5A offers superior thermal dissipation at the expense of board space - making SMA6J8.5AHM3/5A optimal for space-constrained, environmentally regulated industrial designs.
Availability
SMA6J8.5AHM3/5A is available at Aetrix Electronics and suitable for industrial motor drives, automotive body electronics, and telecom infrastructure requiring stable component supply, halogen-free compliance, and MSL Level 1 manufacturability.
Supply support for SMA6J8.5AHM3/5A 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, optoelectronics, and passive components with emphasis on reliability and ruggedness.
The SMA6J series is part of Vishay's TransZORB® TVS platform, engineered specifically for robust, low-leakage, high-power transient suppression in harsh industrial and automotive environments.
FAQ
What is the clamping voltage of the SMA6J8.5AHM3/5A under a 10/1000 µs surge?
The SMA6J8.5AHM3/5A has a maximum clamping voltage (VC) of 13.3 V at 45.1 A under a 10/1000 µs waveform. This value is measured per JEDEC standards and reflects the peak voltage seen across the device during specified surge conditions - critical for ensuring downstream components remain within their absolute maximum ratings. The SMA6J8.5AHM3/5A achieves this with a dynamic resistance of 0.064 Ω.
Does the SMA6J8.5AHM3/5A support lead-free reflow soldering?
Yes, the SMA6J8.5AHM3/5A is qualified for lead-free reflow per J-STD-020, with MSL Level 1 rating and maximum peak temperature of 260 °C. Its matte tin-plated terminals meet JESD 22-B102 solderability requirements, and the molding compound complies with UL 94 V-0 flammability standard - confirming full compatibility with modern Pb-free SMT processes.
How does the breakdown voltage tolerance of SMA6J8.5AHM3/5A affect circuit design?
The SMA6J8.5AHM3/5A specifies a breakdown voltage range of 9.4 V to 10.4 V at 1 mA test current. This ±5.9% tolerance means designers must ensure system operating voltages stay below 9.4 V to avoid premature conduction, while verifying that clamping (13.3 V) remains safely below the withstand rating of protected ICs. The SMA6J8.5AHM3/5A's 8.5 V VWM provides 0.9 V design margin above typical 7.6 V nominal rails.
Is the SMA6J8.5AHM3/5A suitable for bidirectional transient protection?
No, the SMA6J8.5AHM3/5A is unidirectional only, as confirmed in Vishay's datasheet Features section and polarity marking (cathode band). It conducts only during positive transients on the cathode side. For bidirectional protection - such as AC lines or differential data buses - a dedicated bidirectional TVS like SMA6J8.5CA must be selected instead of the SMA6J8.5AHM3/5A.
What is the thermal resistance and power derating behavior of SMA6J8.5AHM3/5A?
The SMA6J8.5AHM3/5A has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 5.0 mm × 5.0 mm copper pads. Its DC power dissipation is rated at 4.0 W at TA = 50 °C, derating linearly above that temperature per Figure 2 in the datasheet. This defines the safe continuous power envelope outside transient events - essential for estimating long-term reliability in thermally constrained enclosures.
SMA6J8.5AHM3/5A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMA6J8.5AHM3/5A FAQ
1.How can I place an order for SMA6J8.5AHM3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA6J8.5AHM3/5A 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 SMA6J8.5AHM3/5A reliable?
The price and inventory of SMA6J8.5AHM3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA6J8.5AHM3/5A is usually 5 days.
3.What payment methods are accepted for SMA6J8.5AHM3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA6J8.5AHM3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA6J8.5AHM3/5A?
SMA6J8.5AHM3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA6J8.5AHM3/5A 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 SMA6J8.5AHM3/5A?
For technical support, including SMA6J8.5AHM3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA6J8.5AHM3/5A requirements.
6.How does Aetrix verify that SMA6J8.5AHM3/5A is sourced from the original manufacturer or authorized distributors?
All SMA6J8.5AHM3/5A 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 SMA6J8.5AHM3/5A meets industry standards.
7.What is the process for return or replacement of SMA6J8.5AHM3/5A?
All SMA6J8.5AHM3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMA6J8.5AHM3/5A, 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 SMA6J8.5AHM3/5A part is unused and in its original packaging.
Return procedure for SMA6J8.5AHM3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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