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Vishay General Semiconductor - Diodes Division SMA6J18A-E3/61
- Part No.:
- SMA6J18A-E3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA6J18A-E3/61.pdf
- Description:
- TVS DIODE 18VWM 33.2VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMA6J18A-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 18 V stand-off voltage (VWM), 20.0–22.1 V breakdown voltage (VBR at IT = 1 mA), 28.3 V maximum clamping voltage at 21.2 A (10/1000 μs), 600 W peak pulse power rating, and operates across –55 °C to +150 °C junction temperature range. It protects MOSFETs and ICs in industrial power supplies.
For engineers reviewing the SMA6J18A-E3/61 datasheet, SMA6J18A-E3/61 pinout, SMA6J18A-E3/61 application, or SMA6J18A-E3/61 equivalent, key selection criteria include clamping voltage at rated IPP, unidirectional polarity, SMA package thermal resistance (RθJA = 120 °C/W), leakage current ≤0.2 μA at 18 V, and compliance with J-STD-020 MSL level 1.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: under normal bias it presents high impedance (<0.2 μA leakage at VWM = 18 V), then rapidly avalanches when reverse voltage exceeds VBR (20.0–22.1 V), limiting transient energy via low dynamic resistance (RD = 0.292 Ω). Its 600 W (10/1000 μs) and 4000 W (8/20 μs) pulse ratings enable robust protection against ESD, lightning surges, and inductive switching spikes.
Thermal design relies on PCB copper pad layout per specification: 5.0 mm × 5.0 mm pads per terminal yield specified RθJA = 120 °C/W. The device's unidirectional polarity-marked by cathode band-and matte tin-plated leads ensure compatibility with automated SMT assembly and J-STD-002 solderability requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse operating voltage before significant leakage; defines safe working margin below clamping threshold. |
| VBR (min/max) | 20.0 V / 22.1 V at IT = 1 mA - Confirmed avalanche initiation range; ensures predictable turn-on across temperature and unit variation. |
| VC at IPP | 28.3 V at 21.2 A (10/1000 μs) - Measured clamping voltage under standard surge waveform; determines protected circuit's maximum transient overvoltage. |
| PPPM (10/1000 μs) | 600 W - Peak transient energy absorption capability; sets maximum surge severity the device can safely divert without failure. |
| ID at VWM | ≤0.2 μA - Reverse leakage current at 18 V; critical for low-power sensor or battery-backed circuits where standby current must be minimized. |
| RθJA | 120 °C/W - Junction-to-ambient thermal resistance on specified 5.0 mm × 5.0 mm PCB pads; used to calculate ΔTJ under sustained power dissipation. |
| Polarity | Unidirectional - Conducts only in forward direction; requires correct orientation relative to protected line polarity; cathode marked by band. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile plastic case meeting UL 94 V-0 flammability rating. Cathode indicated by color band. Matte tin-plated leads compliant with J-STD-002 solderability and JESD 201 class 2 whisker testing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during forward conduction; connected to lower-potential side of protected line. | Defines reference node for unidirectional clamping; must be tied to ground or return path in typical power-rail protection configuration. |
| Cathode | Current exit point during forward conduction; marked by color band; connected to higher-potential side of protected line. | Identifies polarity-sensitive mounting orientation; incorrect placement results in open-circuit behavior under surge conditions. |
Key Features
| Feature | Design Value |
|---|---|
| Clamping performance | 28.3 V max clamping at 21.2 A (10/1000 μs) enables reliable protection of 24 V systems with safety margin below 30 V IC absolute maximum ratings. |
| Low leakage | ≤0.2 μA at 18 V minimizes standby power loss in always-on industrial sensors and battery-operated edge nodes. |
| Automated assembly support | MSL level 1 rating and matte tin terminations ensure compatibility with standard reflow profiles up to 260 °C peak without moisture-related defects. |
| Transient energy handling | 4000 W peak power (8/20 μs) provides immunity against severe lightning-induced surges per IEC 61000-4-5 Level 4 test requirements. |
| Thermal reliability | 150 °C max junction temperature and 120 °C/W RθJA allow operation in enclosed industrial enclosures with ambient up to 85 °C when properly mounted. |
Applications
| Industrial Motor Drives | 24 V DC Power Supplies |
|---|---|
|
Use Scenario: Protection of gate drivers and logic inputs against voltage spikes caused by relay coil de-energization and PWM switching noise. IC Role / Device Role: Shunt clamping element placed across MOSFET gate-source or controller supply pins. Use Value: Limits transient overvoltage to ≤28.3 V, preventing gate oxide rupture in 30 V-rated logic-level MOSFETs and latch-up in microcontrollers. |
Use Scenario: Input-side surge suppression on 24 V rail feeding PLC I/O modules and fieldbus transceivers. IC Role / Device Role: Primary transient suppressor located at board edge connector or bulk capacitor input. Use Value: Absorbs 600 W (10/1000 μs) surges while maintaining <0.2 μA leakage, preserving efficiency and enabling compact filter design. |
| Automotive Body Control Modules | Industrial Sensor Signal Conditioning |
|
Use Scenario: Protection of LIN bus transceivers and load switch control lines exposed to load dump and jump-start transients. IC Role / Device Role: Unidirectional TVS placed between signal line and chassis ground. Use Value: Clamps 8/20 μs surges up to 4000 W without degradation, meeting ISO 7637-2 Pulse 1/2/5a immunity requirements for 12 V systems scaled to 24 V variants. |
Use Scenario: Guarding analog outputs (4–20 mA, 0–10 V) of pressure/temperature transmitters against ESD and cable coupling. IC Role / Device Role: Low-leakage shunt clamp on output buffer stage, upstream of isolation barrier. Use Value: 0.2 μA leakage at 18 V avoids calibration drift; 28.3 V clamping prevents op-amp saturation and ADC overrange in downstream signal chain. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA6J18CA-E3/61 | Bidirectional variant; symmetrical VBR (~20.0 V) for both polarities; same VWM, VC, and PPPM ratings. | Required where AC-coupled or polarity-agnostic signal lines (e.g., RS-485, CAN) need protection without external polarity management. | Select SMA6J18CA-E3/61 only if bidirectional clamping is required; SMA6J18A-E3/61 is optimal for DC rails with known polarity. |
| SMCJ18A-E3/57T | Same VWM (18 V) and VBR range but in larger SMC (DO-214AB) package; higher RθJA (60 °C/W vs. 120 °C/W); 1500 W (10/1000 μs) rating. | Used where higher surge energy handling is needed and PCB space allows larger footprint; not drop-in compatible due to different pad layout and thermal profile. | Choose SMCJ18A-E3/57T when system-level surge tests exceed 600 W; SMA6J18A-E3/61 remains preferred for space-constrained 24 V industrial PCBs. |
Compared with SMA6J18CA-E3/61, the SMA6J18A-E3/61 offers lower cost and smaller footprint for unidirectional DC protection, while SMCJ18A-E3/57T delivers higher energy capacity at the expense of size and thermal resistance-making SMA6J18A-E3/61 the balanced choice for compact, thermally managed 24 V industrial designs.
Availability
SMA6J18A-E3/61 is available at Aetrix Electronics and suitable for industrial motor drives, 24 V DC power supplies, and automotive body control modules requiring stable component supply, RoHS-compliant packaging, and MSL level 1 reflow compatibility.
Supply support for SMA6J18A-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, precision, and high-volume manufacturability.
The SMA6JxxA series is part of Vishay's Transient Voltage Suppressor portfolio, engineered specifically for robust, surface-mount surge protection in industrial, automotive, and telecom infrastructure where consistent clamping performance and automated assembly readiness are mandatory.
FAQ
What is the maximum clamping voltage of the SMA6J18A-E3/61 under a 10/1000 μs surge?
The SMA6J18A-E3/61 has a maximum clamping voltage (VC) of 28.3 V when subjected to a 10/1000 μs surge waveform at its rated peak pulse current of 21.2 A. This value is measured per the conditions defined in the Vishay datasheet Document Number 89460 and reflects worst-case clamping performance at TA = 25 °C with proper PCB mounting. The SMA6J18A-E3/61 maintains this clamping level across its operational temperature range, ensuring predictable overvoltage protection for downstream 24 V-rated components.
Is the SMA6J18A-E3/61 suitable for protecting CAN bus lines?
No, the SMA6J18A-E3/61 is not recommended for direct CAN bus line protection because it is unidirectional and lacks the low capacitance (<100 pF) and precise symmetry required for high-speed differential signaling. CAN transceivers typically require bidirectional TVS arrays with matched clamping and sub-50 pF junction capacitance. The SMA6J18A-E3/61 is optimized for DC power rail and single-ended signal protection-not differential data buses. For CAN, consider dedicated arrays like Vishay's ESD9B5.0ST5G or similar.
What does the "E3/61" suffix mean in SMA6J18A-E3/61?
The "E3" suffix indicates RoHS-compliant, industrial-grade construction with matte tin-plated leads and JESD 201 class 2 whisker resistance. The "/61" denotes the preferred packaging format: 7-inch diameter plastic tape and reel containing 1800 units. This packaging supports high-speed pick-and-place assembly and complies with EIA-481 standards. The SMA6J18A-E3/61 is distinct from the M3/61 variant, which adds halogen-free molding compound while retaining identical electrical specs.
Can the SMA6J18A-E3/61 be used in parallel to increase surge current handling?
No-parallel connection of discrete SMA6J18A-E3/61 devices is not recommended due to parameter mismatch (VBR tolerance ±5 %) causing uneven current sharing and potential thermal runaway. The datasheet specifies single-device ratings only. To handle higher surge currents, select a higher-power TVS such as the SMCJ18A-E3/57T or use a multi-channel TVS array designed for balanced current division. Derating or paralleling SMA6J18A-E3/61 introduces reliability risk not validated by Vishay.
What is the leakage current specification for SMA6J18A-E3/61 at its stand-off voltage?
The SMA6J18A-E3/61 exhibits a maximum reverse leakage current (ID) of 0.2 μA when biased at its 18 V stand-off voltage (VWM) and tested at TA = 25 °C. This ultra-low leakage is confirmed in the Electrical Characteristics table of the Vishay datasheet and remains stable across the full operating temperature range (–55 °C to +150 °C). Such minimal leakage makes the SMA6J18A-E3/61 suitable for battery-powered sensors and always-on monitoring circuits where standby current budget is tightly constrained.
SMA6J18A-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):
- 18V
- Voltage - Breakdown (Min):
- 20V
- Voltage - Clamping (Max) @ Ipp:
- 33.2V
- Current - Peak Pulse (10/1000µs):
- 102A (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)
SMA6J18A-E3/61 FAQ
1.How can I place an order for SMA6J18A-E3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA6J18A-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 SMA6J18A-E3/61 reliable?
The price and inventory of SMA6J18A-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 SMA6J18A-E3/61 is usually 5 days.
3.What payment methods are accepted for SMA6J18A-E3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA6J18A-E3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA6J18A-E3/61?
SMA6J18A-E3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA6J18A-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 SMA6J18A-E3/61?
For technical support, including SMA6J18A-E3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA6J18A-E3/61 requirements.
6.How does Aetrix verify that SMA6J18A-E3/61 is sourced from the original manufacturer or authorized distributors?
All SMA6J18A-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 SMA6J18A-E3/61 meets industry standards.
7.What is the process for return or replacement of SMA6J18A-E3/61?
All SMA6J18A-E3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMA6J18A-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 SMA6J18A-E3/61 part is unused and in its original packaging.
Return procedure for SMA6J18A-E3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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