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Vishay General Semiconductor - Diodes Division SMBJ18CD-M3/I
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- Part No.:
- SMBJ18CD-M3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ18CD-M3/I.pdf
- Description:
- TVS DIODE 18VWM 28.8VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,908
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Product details
Overview
SMBJ18CD-M3/I from Vishay General Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode in 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, 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 - used to protect MOSFETs, sensor interfaces, and industrial I/O circuits.
For engineers reviewing the SMBJ18CD-M3/I datasheet, SMBJ18CD-M3/I pinout, SMBJ18CD-M3/I application, or SMBJ18CD-M3/I equivalent, key selection criteria include bidirectional clamping capability, low leakage (<0.5 μA at VWM), ±3.5% VBR tolerance, MSL Level 1 moisture sensitivity, and halogen-free RoHS-compliant construction suitable for automated SMT assembly.
Technical Context
This bidirectional TVS operates symmetrically in both polarities, enabling protection of AC-coupled or differential signal paths without polarity constraints. Its silicon avalanche structure delivers sub-nanosecond response time and low dynamic impedance, ensuring effective suppression of ESD, lightning-induced surges, and inductive switching transients.
The device is rated for 150 °C maximum junction temperature and derates linearly above 25 °C ambient, with thermal resistance of 125 °C/W (junction-to-ambient, minimum pad layout) and 20 °C/W (junction-to-mount). It meets UL 497B recognition (QVGQ2) and complies with JESD201 Class 2 whisker resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 18 V - Maximum continuous reverse voltage before significant leakage; defines operating margin below clamping threshold |
| VBR (Breakdown Voltage) | 20.3–21.8 V at 1 mA - Tight ±3.5% tolerance ensures predictable turn-on across production lots |
| VC (Clamping Voltage) | 28.8 V at 20.8 A IPPM - Limits transient voltage seen by downstream ICs during 10/1000 μs surge |
| PPPM (Peak Pulse Power) | 600 W - Sustains high-energy transients per IEEE C62.35 standard with 0.01% duty cycle |
| ID (Reverse Leakage) | <0.5 μA at 18 V - Minimizes standby power loss and avoids false triggering in high-impedance circuits |
| Package | SMB (DO-214AA) - Industry-standard 2-pin SMD outline with 5.59 mm × 4.06 mm footprint and MSL Level 1 rating |
| Polarity | Bidirectional - No cathode band; symmetrical clamping for AC signals, data lines, or ungrounded systems |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking. Terminals are matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102. M3 suffix denotes halogen-free, RoHS-compliant, industrial-grade construction meeting JESD 201 Class 2 whisker test.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (Pin 1 & Pin 2) | Reversible terminals | Identical electrical behavior in either direction; no functional distinction - enables placement without orientation check |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled interfaces (e.g., RS-485, CAN, audio lines) without external polarity management |
| ±3.5 % VBR tolerance | Reduces design margin uncertainty and supports tighter system-level surge immunity validation |
| 600 W peak pulse power (10/1000 μs) | Handles IEC 61000-4-5 Level 4 surges (4 kV line-earth) when paired with appropriate series impedance |
| MSL Level 1, 260 °C reflow compatible | Supports standard lead-free reflow profiles without pre-baking, reducing manufacturing complexity |
| UL 497B recognized (QVGQ2) | Validates suitability for telecom and industrial equipment requiring certified surge protection components |
Applications
| Industrial Sensor Interface | RS-485 Communication Line |
|---|---|
Use Scenario: Protecting analog input channels of PLC analog modules from field-wiring induced transients. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed across differential sensor inputs upstream of instrumentation amplifier. Use Value: Limits transient overvoltage to ≤28.8 V, preventing damage to 24-bit ADC front-end while maintaining <0.5 μA leakage at 18 V common-mode range. |
Use Scenario: Safeguarding half-duplex RS-485 transceivers in factory automation networks exposed to motor drive noise. IC Role / Device Role / Timing Role: Symmetrical TVS connected between A/B bus lines and ground to suppress common-mode surges. Use Value: Clamps 10/1000 μs surges up to 20.8 A without degrading signal integrity due to low capacitance and fast response. |
| Automotive Body Control Module | Smart Meter Power Supply Input |
Use Scenario: Transient suppression on LIN bus lines in door module ECUs subjected to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional TVS placed across LIN signal and ground to absorb coupled spikes from adjacent 12 V circuits. Use Value: Withstands repetitive 100 V/50 ms pulses per ISO 7637-2 Test 5a while maintaining stable 18 V stand-off under battery fluctuations. |
Use Scenario: Input-stage surge protection for AC/DC power supplies in utility smart meters installed in outdoor substations. IC Role / Device Role / Timing Role: Primary clamping device across rectified DC bus prior to bulk capacitor and regulator. Use Value: Absorbs 6 kV lightning surges (IEC 61000-4-5) with 28.8 V clamping, limiting stress on downstream 40 V-rated electrolytic capacitors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18CA-E3/52 (Vishay) | Same VWM/VBR/VC specs; differs in packaging (tape-and-reel quantity 2500 vs. 3200) and MSL compliance (E3/52 = MSL Level 1, same as M3/I) | No functional difference; identical electrical and thermal performance; validated for same PCB layouts | Select SMBJ18CA-E3/52 if sourcing through distributor channels requiring Vishay's standard E3/52 reel coding |
| 1.5SMC18CA (ON Semiconductor) | Same SMB package and bidirectional 18 V rating, but wider VBR tolerance (±5 %), higher VC (30.8 V), and lower IPPM (19.4 A at 600 W) | Marginally reduced clamping performance; may require layout review for high-surge environments | Choose SMBJ18CD-M3/I over 1.5SMC18CA where tighter VBR control and lower clamping voltage are critical for sensitive 3.3 V or 5 V logic interfaces |
Compared with SMBJ18CA-E3/52, SMBJ18CD-M3/I offers identical protection performance with optimized reel quantity for high-volume SMT lines; versus 1.5SMC18CA, it delivers superior clamping accuracy and lower VC, directly improving robustness of low-voltage microcontroller I/O protection.
Availability
SMBJ18CD-M3/I is available at Aetrix Electronics and suitable for industrial sensor interfaces, RS-485 communication lines, and automotive body control modules requiring stable component supply, long-term lifecycle support, and traceable RoHS-compliant sourcing.
Supply support for SMBJ18CD-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, MOSFETs, and protection devices with emphasis on reliability, precision, and industrial-grade qualification.
The SMBJxxCD series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-reliability transient suppression in harsh electromagnetic environments including factory automation, energy metering, and transportation systems.
FAQ
What is the polarity configuration of SMBJ18CD-M3/I?
SMBJ18CD-M3/I is a bidirectional TVS diode with no cathode band marking. Its symmetrical avalanche structure provides identical clamping behavior in both directions, making it ideal for protecting AC-coupled signals, differential buses like RS-485 or CAN, and ungrounded systems where polarity cannot be guaranteed during installation or operation. This eliminates orientation-dependent placement errors in automated assembly.
Does SMBJ18CD-M3/I meet UL safety certification requirements?
Yes, SMBJ18CD-M3/I is UL 497B recognized under file number E136766 for both unidirectional and bidirectional configurations. This certification validates its use in telecommunications and industrial equipment requiring third-party verified surge protection performance. The device also meets IEC 61000-4-5 surge immunity requirements when applied with appropriate series impedance and PCB layout practices.
What is the maximum clamping voltage of SMBJ18CD-M3/I under surge conditions?
The maximum clamping voltage (VC) of SMBJ18CD-M3/I is 28.8 V at 20.8 A peak pulse current (IPPM), measured using the standardized 10/1000 μs double-exponential waveform. This value represents the upper limit of voltage imposed on protected circuitry during a full-power 600 W transient event, ensuring compatibility with 3.3 V, 5 V, and 12 V logic families and power rails.
How does the M3 suffix affect SMBJ18CD-M3/I's material composition and compliance?
The M3 suffix on SMBJ18CD-M3/I indicates halogen-free molding compound, RoHS compliance per Directive 2011/65/EU, and industrial-grade qualification. It also certifies compliance with JESD 201 Class 2 whisker resistance testing, ensuring long-term solder joint reliability in thermally cycled environments. The device carries no exemptions and is fully compliant with REACH SVHC and conflict minerals reporting requirements.
Can SMBJ18CD-M3/I replace unidirectional TVS diodes in existing designs?
No - SMBJ18CD-M3/I must not be substituted for unidirectional TVS diodes (e.g., SMBJ18D) without circuit review. While it shares the same VWM and clamping specs, its bidirectional nature allows conduction in both polarities, which may cause unintended current paths in DC-biased circuits or interfere with biasing networks. Replacement requires verification that the protected node is truly floating or AC-coupled and that no steady-state reverse bias exceeds VWM.
SMBJ18CD-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:
- -
- 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/I FAQ
1.How can I place an order for SMBJ18CD-M3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ18CD-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 SMBJ18CD-M3/I reliable?
The price and inventory of SMBJ18CD-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 SMBJ18CD-M3/I is usually 5 days.
3.What payment methods are accepted for SMBJ18CD-M3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ18CD-M3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ18CD-M3/I?
SMBJ18CD-M3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ18CD-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 SMBJ18CD-M3/I?
For technical support, including SMBJ18CD-M3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ18CD-M3/I requirements.
6.How does Aetrix verify that SMBJ18CD-M3/I is sourced from the original manufacturer or authorized distributors?
All SMBJ18CD-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 SMBJ18CD-M3/I meets industry standards.
7.What is the process for return or replacement of SMBJ18CD-M3/I?
All SMBJ18CD-M3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ18CD-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 SMBJ18CD-M3/I part is unused and in its original packaging.
Return procedure for SMBJ18CD-M3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ18CD-M3/I Tags
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ESD9B5.0ST5G
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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ESD5Z5.0T1G
onsemi
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DESD5V0U1BB-7
Diodes Incorporated
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D12V0L1B2LP-7B
Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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