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Vishay General Semiconductor - Diodes Division SMA6J18A-M3/61
- Part No.:
- SMA6J18A-M3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMA6J18A-M3/61.pdf
- Description:
- TVS DIODE 18VWM 28.3VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,251
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Product details
Overview
SMA6J18A-M3/61 from Vishay General Semiconductor is a unidirectional surface-mount TransZORB® transient voltage suppressor in SMA (DO-214AC) package, with 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 10/1000 μs IPPM = 21.2 A, and 600 W peak pulse power rating. It protects MOSFETs, ICs, and sensor signal lines against inductive switching transients in industrial and telecom power rails.
For engineers reviewing the SMA6J18A-M3/61 datasheet, SMA6J18A-M3/61 pinout, SMA6J18A-M3/61 application, or SMA6J18A-M3/61 equivalent, key selection criteria include clamping voltage at rated surge current, unidirectional polarity compatibility, SMA package thermal resistance (RθJA = 120 °C/W), and halogen-free RoHS-compliant construction per M3 suffix.
Technical Context
This device operates as a silicon avalanche diode optimized for transient suppression in DC power and signal lines. Its unidirectional configuration provides forward conduction only during overvoltage events above VBR, with leakage current ≤ 0.2 μA at 18 V and clamping governed by dynamic resistance RD = 0.292 Ω.
Designed for PCB mounting on 5.0 mm × 5.0 mm copper pads, it meets J-STD-020 MSL level 1 and withstands 260 °C lead-free reflow. Junction temperature range spans –55 °C to +150 °C, with thermal resistance junction-to-ambient of 120 °C/W under standard conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 20.0 V / 22.1 V at 1 mA - Ensures reliable avalanche initiation within defined tolerance band |
| VC at IPPM | 28.3 V at 21.2 A (10/1000 μs) - Limits downstream voltage stress during standardized surge event |
| PPPM (10×1000 μs) | 600 W - Sustains short-duration energy surges without failure under JEDEC test waveform |
| ID at VWM | ≤ 0.2 μA - Minimizes standby power loss and avoids false triggering in high-impedance circuits |
| Package | SMA (DO-214AC) - Standardized surface-mount outline enabling automated placement and 120 °C/W thermal dissipation |
| Polarity | Unidirectional - Requires correct cathode orientation; color band denotes cathode terminal |
Pinout & Package
SMA6J18A-M3/61 uses the SMA (DO-214AC) surface-mount package: molded epoxy case meeting UL 94 V-0, matte tin-plated leads solderable per J-STD-002, and cathode indicated by a color band. Dimensions: 4.50 mm × 2.79 mm × 2.20 mm (L × W × H).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry during clamping | Connected to protected line's lower-potential side (e.g., ground-referenced rail) |
| Cathode | Avalanche conduction path during overvoltage | Marked with color band; connects to higher-potential node (e.g., VCC or signal line) |
Key Features
| Feature | Design Value |
|---|---|
| Halogen-free, RoHS-compliant construction | M3 suffix confirms compliance with IEC 61249-2-21 and JESD201 Class 2 whisker resistance |
| MSL Level 1 moisture sensitivity | Enables unlimited floor life and supports 260 °C lead-free reflow without baking |
| Low clamping ratio (VC/VBR ≈ 1.41) | Minimizes voltage overshoot during surge, reducing risk to downstream 20–24 V-rated components |
| High 8/20 μs PPPM rating | 4000 W capability handles fast-rising lightning-induced transients common in telecom interfaces |
| Thermal stability up to +150 °C | Supports operation in enclosed industrial enclosures or near heat-generating power stages |
Applications
| Industrial Motor Drive Protection | Telecom Power Input Stage |
|---|---|
Use Scenario: Suppresses voltage spikes from relay coil de-energization and IGBT switching in 24 V DC motor control modules. IC Role / Device Role / Timing Role: Unidirectional TVS placed across DC bus input to clamp transients before they reach gate drivers and microcontrollers. Use Value: Limits peak voltage to ≤28.3 V, protecting 30 V-rated MOSFETs and logic-level shifters without derating margin loss. | Use Scenario: Shields PoE-powered equipment front-end circuitry from induced surges on 48 V DC input lines. IC Role / Device Role / Timing Role: Primary transient suppressor on secondary-side DC input, coordinated with upstream gas discharge tube. Use Value: Withstands 4000 W (8/20 μs), meeting IEC 61000-4-5 Level 3 immunity requirements for telecom infrastructure. |
| Automotive Body Control Module | Consumer Sensor Signal Line Protection |
Use Scenario: Guards LIN bus interface and window lift motor drivers against load dump and alternator ripple in 12 V systems. IC Role / Device Role / Timing Role: Standoff-rated TVS on 12 V supply rail feeding microcontroller peripherals. Use Value: 18 V VWM ensures no conduction during normal battery fluctuations (up to ~14.8 V), while clamping at 28.3 V prevents latch-up. | Use Scenario: Protects analog output pins of temperature/humidity sensors connected to MCU ADC inputs. IC Role / Device Role / Timing Role: Low-leakage (≤0.2 μA) unidirectional suppressor on 3.3 V or 5 V sensor signal traces. Use Value: Prevents ESD damage during handling and cable coupling events without loading sensitive analog signals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMA6J18A-E3/61 | RoHS-compliant but not halogen-free; same electrical specs and SMA package | Acceptable where halogen-free requirement is not mandated (e.g., non-EU consumer goods) | Select E3 when M3's halogen-free certification is unnecessary and cost optimization is prioritized |
| SMCJ18A-M3 | Higher 1500 W (10×1000 μs) rating, larger SMC (DO-214AB) package, RθJA = 35 °C/W | Better suited for high-energy surges where board space allows larger footprint and improved thermal performance | Choose SMCJ18A-M3 when system-level surge testing exceeds 600 W or ambient temperature exceeds 85 °C |
Compared with SMA6J18A-E3/61, the M3 variant adds halogen-free compliance without electrical trade-offs; versus SMCJ18A-M3, SMA6J18A-M3 offers identical protection in a 40% smaller footprint but with reduced thermal headroom-ideal for space-constrained 24 V industrial nodes.
Availability
SMA6J18A-M3/61 is available at Aetrix Electronics and suitable for industrial motor drives, telecom power inputs, and automotive body control modules requiring stable component supply with halogen-free compliance and MSL Level 1 handling.
Supply support for SMA6J18A-M3/61 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 designs discrete semiconductors including diodes, rectifiers, and transient suppressors, emphasizing reliability, precision, and compliance with global environmental standards.
SMA6J18A-M3/61 belongs to the TransZORB® family of unidirectional TVS diodes engineered for robust, low-profile surge protection in DC power and signal lines across industrial, telecom, and automotive applications.
FAQ
What is the clamping voltage of SMA6J18A-M3/61 at its rated peak pulse current?
The SMA6J18A-M3/61 has a maximum clamping voltage (VC) of 28.3 V when subjected to a 10/1000 μs waveform with a peak pulse current (IPPM) of 21.2 A. This value is measured under standard test conditions (TA = 25 °C, mounted on 5.0 mm × 5.0 mm copper pads) and defines the upper voltage limit imposed on protected circuitry during surge events.
Does SMA6J18A-M3/61 support lead-free reflow soldering?
Yes, SMA6J18A-M3/61 meets J-STD-020 MSL Level 1 and is qualified for lead-free reflow with a maximum peak temperature of 260 °C. Its matte tin-plated terminals comply with J-STD-002 and JESD 22-B102, and the M3 suffix confirms halogen-free, RoHS-compliant construction suitable for modern assembly processes.
How does the M3 suffix differ from E3 in SMA6J18A-M3/61?
The M3 suffix in SMA6J18A-M3/61 indicates halogen-free, RoHS-compliant construction meeting IEC 61249-2-21 and JESD201 Class 2 whisker resistance, whereas E3 denotes RoHS compliance without halogen-free assurance. Electrically and mechanically, SMA6J18A-M3/61 and SMA6J18A-E3/61 are identical-only material content differs.
What is the maximum operating junction temperature for SMA6J18A-M3/61?
The SMA6J18A-M3/61 has a maximum operating junction temperature (TJ max.) of +150 °C and a storage temperature range of –55 °C to +150 °C. Its thermal resistance junction-to-ambient is 120 °C/W under standard PCB mounting conditions, making it suitable for use in thermally demanding industrial environments.
Can SMA6J18A-M3/61 be used in bidirectional transient protection circuits?
No, SMA6J18A-M3/61 is specified for unidirectional polarity only, as confirmed in the Vishay datasheet. It features a cathode band marking and conducts only in reverse avalanche mode. For bidirectional protection, a dedicated bidirectional TVS such as SMBJ18CA-M3 would be required instead of SMA6J18A-M3/61.
SMA6J18A-M3/61 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:
- 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-M3/61 FAQ
1.How can I place an order for SMA6J18A-M3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMA6J18A-M3/61 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-M3/61 reliable?
The price and inventory of SMA6J18A-M3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMA6J18A-M3/61 is usually 5 days.
3.What payment methods are accepted for SMA6J18A-M3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMA6J18A-M3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMA6J18A-M3/61?
SMA6J18A-M3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMA6J18A-M3/61 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-M3/61?
For technical support, including SMA6J18A-M3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMA6J18A-M3/61 requirements.
6.How does Aetrix verify that SMA6J18A-M3/61 is sourced from the original manufacturer or authorized distributors?
All SMA6J18A-M3/61 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-M3/61 meets industry standards.
7.What is the process for return or replacement of SMA6J18A-M3/61?
All SMA6J18A-M3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMA6J18A-M3/61, 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-M3/61 part is unused and in its original packaging.
Return procedure for SMA6J18A-M3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMA6J18A-M3/61 Tags
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