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Vishay General Semiconductor - Diodes Division SMBJ18D-M3/I
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- Part No.:
- SMBJ18D-M3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ18D-M3/I.pdf
- Description:
- TVS DIODE 18VWM 28.8VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,817
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Product details
Overview
SMBJ18D-M3/I from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on power and signal lines. It features a 18 V stand-off voltage (VWM), 20.3–21.8 V breakdown voltage (VBR) at 1 mA, 28.8 V maximum clamping voltage (VC) at 20.8 A peak pulse current, and 600 W peak pulse power rating with 10/1000 μs waveform - deployed for protecting MOSFETs, ICs, and sensor interfaces in industrial power supplies.
For engineers reviewing the SMBJ18D-M3/I datasheet, SMBJ18D-M3/I pinout, SMBJ18D-M3/I application, or SMBJ18D-M3/I equivalent, key selection criteria include unidirectional polarity, ±3.5 % VBR tolerance, low leakage (<0.5 μA at VWM), MSL Level 1 moisture sensitivity, and halogen-free RoHS-compliant construction suitable for automated SMT assembly.
Technical Context
This TVS diode operates as a clamping device that remains non-conductive below its 18 V stand-off voltage and rapidly transitions to low-impedance conduction above its 20.3–21.8 V breakdown threshold. Its 28.8 V clamping voltage at 20.8 A ensures downstream components experience limited overvoltage during transient events such as inductive load switching or ESD.
The SMBJ18D-M3/I uses silicon avalanche junction technology with fast response time (<1 ns), low incremental surge resistance, and thermal resistance of 125 °C/W (junction-to-ambient, mounted on minimum pad layout). It is rated for -55 °C to +150 °C operating junction temperature and meets UL 497B recognition (QVGQ2).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off) | 18 V - Maximum continuous reverse voltage before significant leakage; defines safe operating margin below clamping onset |
| VBR (Breakdown) | 20.3–21.8 V at 1 mA - Tight ±3.5 % tolerance ensures predictable turn-on across production lots |
| VC (Clamping) | 28.8 V at 20.8 A - Limits voltage seen by protected circuit during 10/1000 μs surge, enabling robust IC-level protection |
| PPPM | 600 W - Peak pulse power handling capability per 10/1000 μs waveform, supporting repetitive surges at 0.01 % duty cycle |
| ID (Leakage) | <0.5 μA at 18 V - Minimal standby current preserves efficiency in battery-backed or low-power sensor circuits |
| Package | SMB (DO-214AA) - Standardized surface-mount outline with 2.20 mm max height, optimized for high-density PCB layouts |
| MSL Rating | Level 1 (260 °C peak reflow) - Enables standard lead-free soldering without pre-baking |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads; cathode indicated by band at one end; compliant with J-STD-002 and JESD 22-B102 solderability standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or lowest potential node; forms return path during clamping conduction |
| Cathode (banded end) | High-side transient input terminal | Connected to line under protection; avalanche conduction initiates here when voltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| ±3.5 % VBR tolerance | Enables precise clamping threshold control across manufacturing variance, reducing design margin uncertainty |
| 600 W peak pulse power (10/1000 μs) | Supports IEC 61000-4-5 Level 4 surge immunity (4 kV line-earth) without derating in typical PCB layouts |
| Low leakage <0.5 μA at VWM | Minimizes quiescent power loss in always-on sensor or communication interfaces |
| MSL Level 1, 260 °C peak | Eliminates pre-bake requirement and simplifies SMT process integration in high-volume manufacturing |
| Halogen-free, RoHS-compliant, industrial grade | Meets environmental compliance mandates and long-term reliability requirements for industrial equipment |
Applications
| Industrial Power Supply Protection | Automotive Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 24 V DC input rails in PLC modules against load dump and relay coil flyback. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between input rail and chassis ground. Use Value: Clamps transients to ≤28.8 V, preventing damage to upstream DC-DC controllers and downstream logic ICs. |
Use Scenario: Safeguarding CAN/LIN bus transceivers and analog sensor outputs in engine control units. IC Role / Device Role / Timing Role: Line-side TVS on signal lines referenced to local ground plane. Use Value: Sub-1 ns response limits voltage overshoot during ESD events (IEC 61000-4-2 ±8 kV contact), preserving signal integrity. |
| Telecom Equipment Surge Protection | Consumer Electronics Power Input Protection |
|
Use Scenario: Front-end protection for PoE-powered network switches exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Primary clamping device on 48 V PSE output lines before isolation stage. Use Value: Withstands 600 W pulses while maintaining <0.5 μA leakage, avoiding interference with PoE classification signaling. |
Use Scenario: Input-stage transient suppression on USB-C PD adapters and AC-DC wall adapters. IC Role / Device Role / Timing Role: Unidirectional TVS on secondary-side 5–20 V output rails. Use Value: Halogen-free SMB package supports compact designs while meeting UL 497B recognition for safety-critical consumer applications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18A-M3/I | Same VWM (18 V) and VC (28.8 V), but ±5 % VBR tolerance (vs. ±3.5 % for SMBJ18D-M3/I) | Acceptable where tighter VBR control is not required; lower cost variant | Select SMBJ18A-M3/I only if design tolerates wider clamping onset variation; SMBJ18D-M3/I preferred for precision-sensitive rails |
| SMCJ18A | Same VWM and VC, but larger SMC (DO-214AB) package (higher thermal mass, RθJA = 40 °C/W vs. 125 °C/W) | Better suited for higher ambient temperatures or sustained surge duty cycles | Choose SMCJ18A when board space allows and thermal dissipation >1.5 W is needed; SMBJ18D-M3/I fits tighter layouts with adequate 600 W single-pulse capability |
Compared with SMBJ18A-M3/I, the SMBJ18D-M3/I offers tighter VBR tolerance for more consistent clamping onset; compared with SMCJ18A, it trades thermal capacity for compact SMB footprint - making SMBJ18D-M3/I optimal for space-constrained, single-event surge protection in industrial and telecom front ends.
Availability
SMBJ18D-M3/I is available at Aetrix Electronics and suitable for industrial power supply protection, automotive sensor interface hardening, and telecom equipment surge suppression requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMBJ18D-M3/I 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, power efficiency, and application-specific performance.
The SMBJ series was engineered for high-energy transient suppression in compact SMT formats, targeting industrial automation, automotive electronics, and communications infrastructure where robustness and repeatability are critical.
FAQ
What is the maximum clamping voltage of SMBJ18D-M3/I at its rated peak pulse current?
The SMBJ18D-M3/I has a maximum clamping voltage (VC) of 28.8 V at 20.8 A peak pulse current (IPPM), measured using the standardized 10/1000 μs double-exponential surge waveform. This value defines the upper voltage limit imposed on protected circuitry during transient events and is guaranteed across the full operating temperature range.
Is SMBJ18D-M3/I suitable for bidirectional transient protection?
No, SMBJ18D-M3/I is a unidirectional TVS diode, identified by the "D" suffix and cathode band marking. For bidirectional protection, Vishay offers the SMBJ18CD-M3/I variant, which provides symmetrical clamping in both polarities and uses the "CD" suffix. Using SMBJ18D-M3/I in bidirectional applications risks failure during reverse-polarity transients.
What does the "M3/I" suffix indicate in SMBJ18D-M3/I?
The "M3" suffix denotes halogen-free, RoHS-compliant, industrial-grade construction with JESD 201 Class 2 whisker resistance; "I" specifies packaging in 13-inch diameter tape-and-reel format with 3200 units per reel. This configuration ensures compatibility with high-speed pick-and-place equipment and meets stringent environmental and reliability requirements for industrial deployment.
How does SMBJ18D-M3/I perform under elevated ambient temperatures?
SMBJ18D-M3/I's power dissipation derates linearly above 25 °C ambient: its 1.0 W rating at TA = 25 °C drops to 0 W at TA = 150 °C, per the published derating curve. At 70 °C ambient, usable power is ~0.6 W; for sustained operation, thermal design must ensure junction temperature stays ≤150 °C using appropriate copper pad area per the datasheet layout recommendations.
Does SMBJ18D-M3/I meet any safety agency certifications?
Yes, SMBJ18D-M3/I is Underwriters Laboratories (UL) recognized under file E136766 for both unidirectional and bidirectional variants, complying with UL 497B for primary protector classification. It also meets MSL Level 1 per J-STD-020 and carries Vishay's QVGQ2 certification - confirming suitability for safety-critical surge protection in certified end equipment.
SMBJ18D-M3/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 18V
- Voltage - Breakdown (Min):
- 20.3V
- Voltage - Clamping (Max) @ Ipp:
- 28.8V
- Current - Peak Pulse (10/1000µs):
- 20.8A
- 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-214AA (SMBJ)
SMBJ18D-M3/I FAQ
1.How can I place an order for SMBJ18D-M3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ18D-M3/I 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 SMBJ18D-M3/I reliable?
The price and inventory of SMBJ18D-M3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ18D-M3/I is usually 5 days.
3.What payment methods are accepted for SMBJ18D-M3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ18D-M3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ18D-M3/I?
SMBJ18D-M3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ18D-M3/I 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 SMBJ18D-M3/I?
For technical support, including SMBJ18D-M3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ18D-M3/I requirements.
6.How does Aetrix verify that SMBJ18D-M3/I is sourced from the original manufacturer or authorized distributors?
All SMBJ18D-M3/I 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 SMBJ18D-M3/I meets industry standards.
7.What is the process for return or replacement of SMBJ18D-M3/I?
All SMBJ18D-M3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ18D-M3/I, 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 SMBJ18D-M3/I part is unused and in its original packaging.
Return procedure for SMBJ18D-M3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ18D-M3/I Tags
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Diodes Incorporated
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