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Vishay General Semiconductor - Diodes Division SMBJ18CD-M3/H
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- Part No.:
- SMBJ18CD-M3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ18CD-M3/H.pdf
- Description:
- TVS DIODE 18VWM 28.8VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:1,428
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Product details
Overview
SMBJ18CD-M3/H from Vishay General Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode in the SMB (DO-214AA) package, designed for clamping voltage transients on signal and power lines. It features a 18 V stand-off voltage (VWM), 20.3–21.8 V breakdown voltage (VBR) at 1 mA, 600 W peak pulse power (10/1000 μs), <0.5 μA reverse leakage at VWM, and clamps to ≤28.8 V at 20.8 A peak surge current.
For engineers reviewing the SMBJ18CD-M3/H datasheet, SMBJ18CD-M3/H pinout, SMBJ18CD-M3/H application, or SMBJ18CD-M3/H equivalent, this device is selected for robust ESD and surge protection in low-capacitance, space-constrained industrial sensor interfaces, USB data lines, and DC power rails where bidirectional clamping and tight VBR tolerance (±3.5 %) are critical.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with identical electrical characteristics in forward and reverse directions. Its silicon avalanche structure enables sub-nanosecond response time and low dynamic impedance, ensuring effective suppression of fast-rising transients such as ESD (IEC 61000-4-2) and inductive switching spikes.
The device is rated for 150 °C maximum junction temperature and meets MSL Level 1 per J-STD-020 with 260 °C lead-free reflow compatibility. Thermal resistance is 125 °C/W (junction-to-ambient, mounted on minimum pad layout), and it delivers 5.0 W steady-state power dissipation at case temperature TM = 50 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse operating voltage before significant conduction begins |
| VBR min/max | 20.3 V / 21.8 V at 1 mA - Tight ±3.5 % tolerance ensures predictable clamping onset across production lots |
| VC @ IPPM | 28.8 V at 20.8 A - Clamped voltage during 10/1000 μs surge defines worst-case stress on downstream ICs |
| PPPM | 600 W - Peak pulse power handling capability under standardized 10/1000 μs waveform |
| ID @ VWM | <0.5 μA - Ultra-low leakage preserves signal integrity and battery life in high-impedance circuits |
| TJ max | 150 °C - Enables reliable operation in industrial and automotive under-hood environments |
| Package | SMB (DO-214AA) - Surface-mount footprint compatible with automated assembly and IPC-7351B standard |
Pinout & Package
Two-terminal device in SMB (DO-214AA) package; no polarity marking for bidirectional types. Cathode band omitted per design-terminals are symmetrical and interchangeable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (both) | Transient current path | Current flows bidirectionally through either terminal during overvoltage events; no DC polarity dependency |
| Case | Thermal path | Exposed metal slug provides primary thermal conduction to PCB copper; requires minimum 5.0 mm × 5.0 mm pad for rated PD |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns |
| ±3.5 % VBR tolerance | Reduces design margin overhead and improves consistency in multi-channel protection schemes |
| 600 W peak pulse rating | Withstands IEC 61000-4-5 Level 4 surges (4 kV line-earth) when properly laid out |
| MSL Level 1 rating | Supports standard lead-free reflow without baking or special handling |
| Halogen-free, RoHS-compliant | Meets environmental compliance requirements for industrial and consumer end equipment |
Applications
| Industrial Sensor Interface | USB 2.0 Data Line Protection |
|---|---|
Use Scenario: Protecting analog output (4–20 mA) and digital I/O lines of PLC modules against field-induced transients from motor drives and solenoid switching. IC Role / Device Role / Timing Role: Standoff-clamp TVS placed directly at connector entry point to shunt surge energy before reaching precision ADC or isolator inputs. Use Value: Limits transient voltage to ≤28.8 V, preventing latch-up or damage to 3.3 V/5 V interface ICs while maintaining <0.5 μA leakage at 18 V nominal rail. | Use Scenario: Safeguarding D+ and D− lines of embedded USB host controllers from ESD events and cable discharge. IC Role / Device Role / Timing Role: Bidirectional clamping element placed in series with each data line, leveraging symmetry to avoid signal inversion or DC bias shift. Use Value: Sub-nanosecond response and low capacitance preserve USB 2.0 signal integrity up to 480 Mbps; ±3.5 % VBR ensures consistent trigger across dual-line protection. |
| DC Power Rail Protection | Automotive Body Control Module |
Use Scenario: Secondary surge suppression on 12 V or 24 V supply rails feeding microcontrollers and CAN transceivers in factory automation systems. IC Role / Device Role / Timing Role: Parallel-connected TVS acting as last-resort clamp after primary filtering, triggered only during extreme transients exceeding filter attenuation. Use Value: 600 W rating handles load-dump simulations (ISO 7637-2 Pulse 5a); 150 °C TJ max supports operation near hot power components. | Use Scenario: Protecting LIN bus and sensor supply lines in non-safety-critical body electronics exposed to battery transients and alternator noise. IC Role / Device Role / Timing Role: Bidirectional standoff device on 12 V sensor VCC and LIN signal lines, compliant with ISO 16750-2 electrical stress requirements. Use Value: M3 suffix ensures whisker-resistant matte tin plating for long-term reliability; DO-214AA package fits compact BCM PCB layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18CA-E3/52 (Vishay) | Same VWM/VBR/PPPM specs; differs in packaging (tape-and-reel quantity and reel diameter) and M3 vs. E3 suffix (whisker test class) | No functional difference in circuit behavior; E3 variant uses different plating process but same thermal and electrical performance | Select SMBJ18CD-M3/H for industrial-grade whisker resistance (JESD 201 Class 2) and halogen-free compliance |
| P6SMB18CA (Littelfuse) | Identical SMB package, 18 V VWM, 20.3–21.8 V VBR, 600 W PPPM; minor differences in RθJA (130 °C/W vs. 125 °C/W) and ID spec (≤1.0 μA vs. ≤0.5 μA) | Valid alternative where slightly higher leakage is acceptable; same footprint and pinout | Choose SMBJ18CD-M3/H when ultra-low leakage (<0.5 μA) and tighter VBR tolerance are required for precision sensing paths |
Compared with SMBJ18CA-E3/52 and P6SMB18CA, the SMBJ18CD-M3/H offers superior leakage control and certified whisker resistance-critical for long-life industrial deployments-while maintaining full electrical and mechanical interchangeability in most designs.
Availability
SMBJ18CD-M3/H is available at Aetrix Electronics and suitable for industrial sensor interfaces, USB 2.0 data line protection, and DC power rail surge suppression requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for SMBJ18CD-M3/H 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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMBJ series is part of Vishay's TRANSZORB® TVS platform, engineered for high-energy transient suppression in harsh environments-including industrial automation, automotive subsystems, and telecom infrastructure-where repeatable clamping and long-term stability are mandatory.
FAQ
What does the "CD" suffix indicate in SMBJ18CD-M3/H?
The "CD" suffix denotes a bidirectional configuration: SMBJ18CD-M3/H provides symmetrical clamping for both positive and negative transients, unlike unidirectional variants (e.g., SMBJ18D). This eliminates polarity concerns in AC-coupled or floating circuits and is confirmed in Vishay's datasheet revision 09-Jan-2024, Document Number 87606, where CD devices are explicitly defined for bidirectional applications with identical characteristics in both directions.
Is SMBJ18CD-M3/H compatible with lead-free reflow soldering?
Yes, SMBJ18CD-M3/H meets J-STD-020 MSL Level 1 and is qualified for lead-free reflow with a maximum peak temperature of 260 °C. The M3 suffix confirms compliance with JESD 201 Class 2 whisker testing, and the matte tin-plated terminals comply with J-STD-002 and JESD 22-B102 solderability standards-ensuring robust joint formation without pre-baking.
What is the maximum clamping voltage of SMBJ18CD-M3/H under surge conditions?
The maximum clamping voltage (VC) of SMBJ18CD-M3/H is 28.8 V at 20.8 A peak pulse current (IPPM), measured using the standardized 10/1000 μs waveform. This value is specified in the Electrical Characteristics table of the Vishay datasheet (Document Number 87606) and represents the worst-case voltage seen by protected circuitry during a full-rated surge event.
How does SMBJ18CD-M3/H differ from unidirectional SMBJ18D-M3/H?
SMBJ18CD-M3/H is bidirectional with no cathode band and identical VBR/VWM in both directions, whereas SMBJ18D-M3/H is unidirectional with a cathode band and conducts only in reverse bias. Their clamping curves, thermal ratings, and package dimensions are otherwise identical-but substituting one for the other requires verifying circuit polarity and transient directionality to avoid unintended conduction.
Can SMBJ18CD-M3/H be used in automotive applications?
Yes, SMBJ18CD-M3/H is suitable for non-safety-critical automotive applications such as body control modules, LIN bus protection, and sensor supply lines. It meets ISO 16750-2 electrical stress requirements, operates from –55 °C to +150 °C, and its M3 suffix ensures whisker resistance for long-term reliability-though system-level qualification per AEC-Q101 remains the customer's responsibility.
SMBJ18CD-M3/H 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:
- -
- Bidirectional Channels:
- 1
- 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)
SMBJ18CD-M3/H FAQ
1.How can I place an order for SMBJ18CD-M3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ18CD-M3/H 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 SMBJ18CD-M3/H reliable?
The price and inventory of SMBJ18CD-M3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ18CD-M3/H is usually 5 days.
3.What payment methods are accepted for SMBJ18CD-M3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ18CD-M3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ18CD-M3/H?
SMBJ18CD-M3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ18CD-M3/H 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 SMBJ18CD-M3/H?
For technical support, including SMBJ18CD-M3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ18CD-M3/H requirements.
6.How does Aetrix verify that SMBJ18CD-M3/H is sourced from the original manufacturer or authorized distributors?
All SMBJ18CD-M3/H 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 SMBJ18CD-M3/H meets industry standards.
7.What is the process for return or replacement of SMBJ18CD-M3/H?
All SMBJ18CD-M3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ18CD-M3/H, 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 SMBJ18CD-M3/H part is unused and in its original packaging.
Return procedure for SMBJ18CD-M3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ18CD-M3/H Tags
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