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Diodes Incorporated SMBJ18CA-13-F
- Part No.:
- SMBJ18CA-13-F
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ18CA-13-F.pdf
- Description:
- TVS DIODE 18VWM 29.2VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:204,723
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Product details
Overview
SMBJ18CA-13-F from Diodes Incorporated is a bi-directional 600W surface-mount transient voltage suppressor (TVS) diode with 18V reverse standoff voltage, 20.0–23.3V breakdown range at 1mA, 29.2V max clamping voltage at 20.5A peak pulse current, and SMB package. It protects DC power rails and data lines in industrial motor drives, automotive body control modules, and PoE-powered Ethernet switches against ESD and lightning-induced surges.
For engineers reviewing the SMBJ18CA-13-F datasheet, SMBJ18CA-13-F pinout, SMBJ18CA-13-F application, or SMBJ18CA-13-F equivalent, key selection criteria include clamping voltage margin relative to system rail, unidirectional vs. bi-directional polarity requirements for AC-coupled signals, IPP derating above +25°C, and SMB footprint compatibility with IPC-7351B layout standards.
Technical Context
This bi-directional TVS operates symmetrically across both polarities, enabling protection of AC signal paths and floating bus lines without polarity constraints. Its glass-passivated junction ensures stable VBR and low leakage (<5µA at 18V), while the 600W peak pulse rating supports 8.3ms half-sine surge events per REA standard.
The device exhibits 29.2V clamping at 20.5A IPP, delivering 11.2V overvoltage margin above its 18V VRWM. Thermal derating follows 4.8W/°C above +25°C ambient, with steady-state dissipation limited to 5.0W at TL = +75°C and full operation from –55°C to +150°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 600W - sustains single 8.3ms surge events without failure under defined test conditions |
| Reverse Standoff Voltage (VRWM) | 18.0V - maximum continuous DC or RMS voltage before significant leakage begins |
| Breakdown Voltage (VBR) | 20.0–23.3V @ 1.0mA - guaranteed conduction onset window for reliable clamping threshold |
| Max Clamping Voltage (VC) | 29.2V @ 20.5A - upper limit of voltage seen by protected circuit during rated surge |
| Peak Pulse Current (IPP) | 20.5A - maximum non-repetitive surge current the device can safely divert |
| Operating Temperature | –55°C to +150°C - validated performance across extended industrial and automotive environments |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with UL 94V-0 flammability rating, 0.1g mass, matte tin-plated terminals solderable per MIL-STD-202 Method 208.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (Bi-directional) | Surge current path (symmetrical) | No polarity marking; terminals interchangeable - enables AC line protection without orientation constraints |
Key Features
| Feature | Design Value |
|---|---|
| 600W peak pulse power | Supports high-energy transients in industrial 24V/48V systems without thermal runaway |
| Glass-passivated die construction | Ensures stable VBR tolerance and <5µA leakage at VRWM, critical for low-power standby circuits |
| Bi-directional configuration | Protects AC-coupled interfaces (e.g., RS-485, CAN FD) without external polarity management |
| SMB surface-mount package | Enables automated placement and reflow compatibility with IPC-7351B footprint (5.0–5.59mm length) |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
Use Scenario: Protection of 24V DC input rails against load dump and inductive kickback from solenoids and relays. IC Role / Device Role / Timing Role: Transient voltage suppressor placed directly at connector entry point to clamp surges before reaching MCU power supply. Use Value: 29.2V clamping ensures downstream 3.3V/5V regulators remain within absolute maximum ratings during ISO 7637-2 Pulse 5a events. |
Use Scenario: Surge suppression on LIN bus lines exposed to battery transients and ESD in door module assemblies. IC Role / Device Role / Timing Role: Bi-directional TVS shunting fast-rising transients (<1ns rise time) on bidirectional serial bus. Use Value: Symmetrical clamping preserves signal integrity on LIN's open-drain topology without distorting logic thresholds. |
| PoE-Powered Ethernet Switches | Smart Building Sensor Nodes |
Use Scenario: Input protection on 48V PoE PD interface against cable discharge events and lightning-induced common-mode surges. IC Role / Device Role / Timing Role: Primary front-end TVS on PSE-facing port, coordinated with secondary GDT or MOV for staged energy handling. Use Value: 600W rating absorbs IEEE 802.3af/at surge energy (up to 100J) when paired with upstream current limiting. |
Use Scenario: ESD protection for Zigbee/Z-Wave RF antenna feedlines and sensor analog inputs in battery-powered HVAC nodes. IC Role / Device Role / Timing Role: Low-capacitance TVS (typ. 100pF at 0V) placed adjacent to RF IC pins to avoid impedance mismatch. Use Value: Sub-5µA leakage at 18V prevents measurable drain on 10-year lithium-thionyl chloride batteries. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18A-13-F | Uni-directional; cathode band marking; 29.2V VC same, but conducts only in reverse bias | Required where polarity is fixed (e.g., 12V DC input with ground-referenced rail) | Select for DC-only rails with known polarity; avoids unnecessary bi-directional cost where not needed |
| SMAJ18CA | Lower 400W PPK; SMA package (smaller footprint, lower thermal mass); same VRWM/VC specs | Suitable for space-constrained consumer IoT nodes with lower surge exposure (IEC 61000-4-2 Level 3) | Choose when board area is critical and surge threat level is below industrial grade (e.g., indoor residential sensors) |
Compared with SMBJ18CA-13-F, the uni-directional SMBJ18A-13-F reduces cost and simplifies layout on polarized rails, while the SMAJ18CA trades 33% peak power headroom for 30% smaller PCB area - both require revalidation of thermal derating and clamping margin in the target application.
Availability
SMBJ18CA-13-F is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and PoE-powered Ethernet switches requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMBJ18CA-13-F 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
Diodes Incorporated is a global semiconductor company specializing in discrete, analog, and mixed-signal solutions, with design centers across Asia, Europe, and the US, serving industrial, computing, and automotive markets.
This part belongs to Diodes' SMBJ series of high-power TVS diodes, engineered specifically for robust transient immunity in harsh environments where reliability under repeated surge stress is mandatory.
FAQ
What is the difference between SMBJ18CA-13-F and SMBJ18A-13-F?
The "C" suffix denotes bi-directional functionality: SMBJ18CA-13-F clamps surges of either polarity, making it suitable for AC lines or floating buses, while SMBJ18A-13-F is uni-directional with a cathode band and only clamps reverse-biased transients. Both share identical VRWM, VBR, and VC values, but their terminal behavior differs fundamentally in circuit implementation.
Can SMBJ18CA-13-F be used in automotive applications?
Yes - it meets AEC-Q200 stress test requirements for transient suppression and operates from –55°C to +150°C. Its 29.2V clamping voltage provides margin against ISO 7637-2 Pulse 1 (–150V/2Ω) and Pulse 5a (75V/10Ω) when placed with appropriate series impedance, and its bi-directional nature suits LIN and CAN FD bus protection.
What is the thermal derating behavior above +25°C ambient?
Peak pulse power derates linearly at 4.8W/°C above +25°C ambient. At +85°C ambient, maximum usable PPK drops to 312W (600W − 4.8W × 60°C). Steady-state power must also be limited to 5.0W at TL = +75°C, with derating to zero at +150°C per Fig. 6 in DS19002 Rev. 20-2.
Does SMBJ18CA-13-F have a polarity marking on the package?
No - bi-directional TVS devices like SMBJ18CA-13-F omit the cathode band marking found on uni-directional variants. The SMB package has two identical terminals; orientation during placement does not affect electrical function, simplifying automated assembly for AC-coupled or differential signal paths.
SMBJ18CA-13-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- DO-214AA, SMB
- Series:
- SMBJ
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 18V
- Voltage - Breakdown (Min):
- 20V
- Voltage - Clamping (Max) @ Ipp:
- 29.2V
- Current - Peak Pulse (10/1000µs):
- 20.5A
- 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:
- SMB
SMBJ18CA-13-F FAQ
1.How can I place an order for SMBJ18CA-13-F through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ18CA-13-F 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 SMBJ18CA-13-F reliable?
The price and inventory of SMBJ18CA-13-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ18CA-13-F is usually 5 days.
3.What payment methods are accepted for SMBJ18CA-13-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ18CA-13-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ18CA-13-F?
SMBJ18CA-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ18CA-13-F 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 SMBJ18CA-13-F?
For technical support, including SMBJ18CA-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ18CA-13-F requirements.
6.How does Aetrix verify that SMBJ18CA-13-F is sourced from the original manufacturer or authorized distributors?
All SMBJ18CA-13-F 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 SMBJ18CA-13-F meets industry standards.
7.What is the process for return or replacement of SMBJ18CA-13-F?
All SMBJ18CA-13-F units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ18CA-13-F, 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 SMBJ18CA-13-F part is unused and in its original packaging.
Return procedure for SMBJ18CA-13-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ18CA-13-F 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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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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