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Vishay General Semiconductor - Diodes Division SMA6J18A-M3/5A
- Part No.:
- SMA6J18A-M3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA6J18A-M3/5A.pdf
- Description:
- TVS DIODE 18VWM 28.3VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMA6J18A-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 18 V stand-off voltage (VWM), 20.0–22.1 V breakdown voltage (VBR at IT = 1 mA), 28.3 V maximum clamping voltage (VC) at 10/1000 μs 65.9 A surge, and 600 W peak pulse power rating. It protects MOSFETs and ICs in industrial power supplies against inductive switching surges.
For engineers reviewing the SMA6J18A-M3/5A datasheet, SMA6J18A-M3/5A pinout, SMA6J18A-M3/5A application, or SMA6J18A-M3/5A equivalent, key selection criteria include unidirectional polarity, 28.3 V clamping at 65.9 A, SMA package thermal resistance (RθJA = 120 °C/W), 0.292 Ω dynamic resistance, and halogen-free RoHS-compliant construction per M3 suffix.
Technical Context
This TVS diode operates as a voltage-clamped crowbar device triggered above its breakdown threshold, with fast response (<1 ps) to transient overvoltages. Its unidirectional configuration allows integration into DC-biased circuits without reverse conduction during normal operation.
Clamping performance is defined by VC = RD × IPP + VBR(max), where RD = 0.292 Ω and VBR(max) = 22.1 V at 25 °C. Thermal derating follows Fig. 2: power dissipation drops linearly above TA = 25 °C, with full derating to zero at TJ = 150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse voltage before leakage exceeds 0.2 μA; sets operating margin below breakdown. |
| VBR (min/max) | 20.0 V / 22.1 V at 1 mA - Confirmed breakdown range ensures reliable triggering across temperature and unit variation. |
| VC @ IPP = 65.9 A | 28.3 V - Clamping voltage under 10/1000 μs surge; defines worst-case voltage seen by protected circuitry. |
| PPPM (10 × 1000 μs) | 600 W - Peak transient energy handling capacity; determines survivability of common lightning/inductive spikes. |
| RD | 0.292 Ω - Dynamic resistance governing VC rise slope; lower value improves clamping tightness. |
| TJ(max) | +150 °C - Maximum junction temperature; enables operation in high-ambient industrial environments. |
| Package | SMA (DO-214AC) - Standardized surface-mount outline with 5.0 mm × 5.0 mm copper pad thermal requirement. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case meeting UL 94 V-0, 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 clamp configuration. |
| Cathode | Transient voltage sensing node | Connected to protected line (e.g., 12–24 V rail); clamps when voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| Halogen-free, RoHS-compliant construction | M3 suffix certifies compliance with JEDEC JESD201 Class 2 whisker resistance and environmental directives. |
| MSL Level 1 moisture sensitivity | Rated for floor life unlimited at ≤30 °C/85 % RH; supports standard SMT reflow without baking. |
| Low dynamic resistance (0.292 Ω) | Minimizes VC overshoot during fast transients, improving protection margin for downstream ICs. |
| 150 °C max junction temperature | Enables deployment in enclosed industrial enclosures or near heat-generating components without derating penalties. |
| 600 W peak pulse power (10/1000 μs) | Meets IEC 61000-4-5 Level 3 (1 kV surge) requirements for 24 V DC power inputs. |
Applications
| Industrial Power Supply Protection | Automotive Body Control Module (BCM) Inputs |
|---|---|
Use Scenario: 24 V DC input stage of programmable logic controller (PLC) power module exposed to relay coil flyback and load dump events. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between input rail and chassis ground to limit transient voltage to ≤28.3 V. Use Value: Prevents damage to upstream DC-DC converter ICs and microcontrollers during 65.9 A inductive surges per IEC 61000-4-4. |
Use Scenario: LIN bus or sensor supply line in BCM subjected to battery disconnect transients and alternator load dump. IC Role / Device Role / Timing Role: Standoff protection device maintaining 18 V nominal operation while clamping 10/1000 μs surges to 28.3 V. Use Value: Ensures sensor signal integrity and MCU reset immunity during automotive ISO 7637-2 Pulse 1/2a events up to 600 W. |
| Telecom Remote Radio Unit (RRU) DC Feeds | Consumer Appliance Motor Drive Boards |
Use Scenario: -48 V DC power feed to outdoor base station RRU, subject to lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: Primary clamping element in multi-stage protection network, coordinated with GDT and MOV. Use Value: Provides fast-response secondary clamping after coarse GDT diversion, limiting residual voltage to 28.3 V within 1 ns. |
Use Scenario: 12–24 V motor driver PCB in washing machine control board, exposed to brushed motor commutation spikes. IC Role / Device Role / Timing Role: Localized TVS across H-bridge supply rails to suppress 100 V/100 ns spikes generated during PWM switching. Use Value: Eliminates false triggering of gate drivers and prevents latch-up in motor control ICs during repetitive commutation events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA6J18A-E3/5A | Same electrical specs; E3 suffix indicates RoHS-compliant with lead-free matte tin plating but not halogen-free. | Approved for consumer electronics where halogen-free is not mandated; lacks JESD201 Class 2 whisker certification. | Select E3 for cost-sensitive commercial designs; M3 required for industrial/automotive where whisker resistance and halogen-free compliance are enforced. |
| SMB6J18A-M3 | Same VWM/VBR/VC; SMB package has larger pad area (6.2 mm × 5.3 mm vs. SMA's 5.0 mm × 5.0 mm) and lower RθJA (90 °C/W). | Better thermal performance in high-power or high-ambient scenarios; requires PCB layout change due to larger footprint. | Choose SMB6J18A-M3 when sustained surge duty cycle or ambient >70 °C demands improved thermal margin; SMA6J18A-M3/5A fits space-constrained layouts. |
Compared with SMA6J18A-E3/5A, the M3 variant adds halogen-free and whisker-resistant qualification for harsh environments; compared with SMB6J18A-M3, the SMA version trades thermal performance for compactness-critical in dense industrial PCBs where board space is constrained.
Availability
SMA6J18A-M3/5A is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, telecom remote radio units, and consumer appliance motor drives requiring stable component supply and halogen-free compliance.
Supply support for SMA6J18A-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, TVS devices, and optoelectronics with emphasis on reliability and industrial-grade performance.
The SMA6J series was engineered specifically for robust, surface-mount transient suppression in DC power rails and signal lines across industrial, automotive, and telecom infrastructure-prioritizing low clamping voltage, repeatable surge endurance, and automated assembly compatibility.
FAQ
What is the maximum clamping voltage of the SMA6J18A-M3/5A under a 10/1000 μs surge?
The SMA6J18A-M3/5A exhibits a maximum clamping voltage (VC) of 28.3 V when subjected to a 10/1000 μs waveform at its rated peak pulse current of 65.9 A. This value is measured per Figure 1 and Table 1 in the Vishay datasheet 89460, Revision 09-Jan-2024, and defines the upper voltage limit imposed on protected circuitry during standardized surge events. The SMA6J18A-M3/5A maintains this clamping performance across its specified operating temperature range.
Does the SMA6J18A-M3/5A support bidirectional transient suppression?
No, the SMA6J18A-M3/5A is strictly unidirectional, as confirmed in the "FEATURES" section of the Vishay datasheet: "Available in unidirectional polarity only." Its cathode band marks the terminal that connects to the line being protected, while the anode connects to ground. For bidirectional protection, a separate symmetric TVS array or back-to-back configuration would be required-not supported by the SMA6J18A-M3/5A itself.
What does the "M3" suffix indicate in SMA6J18A-M3/5A?
The "M3" suffix in SMA6J18A-M3/5A denotes halogen-free, RoHS-compliant construction with matte tin-plated leads qualified to JESD201 Class 2 for whisker resistance. It also confirms compliance with Vishay's material categorization standard (document 99912). This distinguishes it from the "E3" variant, which is RoHS-compliant but not halogen-free. The SMA6J18A-M3/5A meets stringent environmental and reliability requirements for industrial and automotive deployments.
What is the thermal resistance junction-to-ambient (RθJA) for SMA6J18A-M3/5A?
The typical thermal resistance junction-to-ambient (RθJA) for SMA6J18A-M3/5A is 120 °C/W, as specified in the "THERMAL CHARACTERISTICS" table of the Vishay datasheet 89460. This value assumes mounting on the minimum recommended PCB pad layout: 5.0 mm × 5.0 mm copper pads per terminal. Exceeding this thermal resistance risks exceeding the 150 °C maximum junction temperature during repeated surge events.
Can SMA6J18A-M3/5A be used in automotive applications requiring AEC-Q200 qualification?
No, the SMA6J18A-M3/5A is not AEC-Q200 qualified. Vishay documents it as industrial grade only, with no mention of AEC-Q200 stress testing or qualification in datasheet 89460. While its electrical specs (e.g., 150 °C TJ(max), M3 halogen-free construction) align with automotive environmental needs, formal qualification requires additional test reports and part numbering. For AEC-Q200-compliant TVS diodes, consult Vishay's Automotive-grade SMAJ or SM8S series instead of SMA6J18A-M3/5A.
SMA6J18A-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):
- 18V
- Voltage - Breakdown (Min):
- 20V
- Voltage - Clamping (Max) @ Ipp:
- 28.3V
- Current - Peak Pulse (10/1000µs):
- 21.2A
- 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)
SMA6J18A-M3/5A FAQ
1.How can I place an order for SMA6J18A-M3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA6J18A-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 SMA6J18A-M3/5A reliable?
The price and inventory of SMA6J18A-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 SMA6J18A-M3/5A is usually 5 days.
3.What payment methods are accepted for SMA6J18A-M3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA6J18A-M3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA6J18A-M3/5A?
SMA6J18A-M3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA6J18A-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 SMA6J18A-M3/5A?
For technical support, including SMA6J18A-M3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA6J18A-M3/5A requirements.
6.How does Aetrix verify that SMA6J18A-M3/5A is sourced from the original manufacturer or authorized distributors?
All SMA6J18A-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 SMA6J18A-M3/5A meets industry standards.
7.What is the process for return or replacement of SMA6J18A-M3/5A?
All SMA6J18A-M3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMA6J18A-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 SMA6J18A-M3/5A part is unused and in its original packaging.
Return procedure for SMA6J18A-M3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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