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Diodes Incorporated SMBJ18CAQ-13-F
- Part No.:
- SMBJ18CAQ-13-F
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ18CAQ-13-F.pdf
- Description:
- TVS DIODE 18VWM 29.2VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:58,814
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Product details
Overview
SMBJ18CAQ-13-F from Diodes Incorporated is a bi-directional 600W automotive transient voltage suppressor (TVS) diode designed for ISO7637-2 and ISO10605 surge/ESD protection in vehicle power-line interfaces. It features 18V reverse standoff voltage (VRWM), 29.2V max clamping voltage at 20.5A peak pulse current, and AEC-Q101 qualification for under-hood electronics.
For engineers reviewing the SMBJ18CAQ-13-F datasheet, SMBJ18CAQ-13-F pinout, SMBJ18CAQ-13-F application, or SMBJ18CAQ-13-F equivalent, this part supports critical design verification for automotive CAN/LIN bus protection, body control module inputs, and infotainment power rail hardening against load dump and ESD events.
Technical Context
This bi-directional TVS operates symmetrically across both polarities to clamp transients on bidirectional signal or power lines-essential for protecting LIN/CAN transceivers and sensor interfaces where voltage polarity reversal may occur. Its 10×1000μs waveform response ensures compliance with ISO7637-2 Pulse 1 (−150V), Pulse 2a (+112V), Pulse 3a (−220V), and Pulse 3b (+150V).
Thermally rated for −55°C to +175°C junction operation and packaged in SMB with 0.1g mass, it sustains 5W steady-state dissipation at TL = +75°C and derates linearly above +25°C (4.8W/°C), enabling reliable placement near high-temperature ECUs without thermal runaway.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 600W - withstands ISO7637-2 load dump and ESD surges without failure |
| Reverse Standoff Voltage | 18.0V - blocks normal 12V/24V automotive battery operation while triggering above threshold |
| Clamping Voltage | 29.2V @ 20.5A - limits downstream IC voltage to safe level during 10×1000μs transient |
| Breakdown Voltage | 20.0–22.1V @ 1mA - ensures precise, repeatable conduction onset under stress |
| Leakage Current | <0.5µA @ 18V - negligible standby power loss in always-on vehicle modules |
| Operating Temperature | −55°C to +175°C - qualified for engine bay, transmission, and ADAS sensor environments |
| AEC-Q101 Qualified | Yes - validated for automotive production use with PPAP capability and IATF 16949 manufacturing |
Pinout & Package
Package: SMB (Surface-Mount Small Outline), molded plastic UL 94V-0, 3.30–3.94mm width, 5.00–5.59mm length, 2.00–2.50mm height, 0.1g weight. Moisture sensitivity level 1 per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal (bi-directional) | Accepts transient energy from either polarity; no fixed cathode/anode orientation |
| Cathode | Current exit terminal (bi-directional) | Completes low-impedance path to ground or return rail during clamping event |
Key Features
| Feature | Design Value |
|---|---|
| Bi-directional clamping | Enables single-device protection of AC-coupled or polarity-agnostic lines like LIN bus or sensor differential pairs |
| 600W peak pulse rating | Meets ISO7637-2 Pulse 3b (+150V) and ISO10605 ±30kV ESD without degradation |
| AEC-Q101 qualification | Validated for automotive production with change control, PPAP documentation, and IATF 16949 traceability |
| Halogen & antimony free | Complies with automotive green standards: Br+Cl <1500ppm, Sb <1000ppm |
Applications
| Engine Control Unit (ECU) Power Input | CAN FD Transceiver Protection |
|---|---|
Use Scenario: Protects 12V supply rail of engine control units against load dump (ISO7637-2 Pulse 5a) and jump-start overvoltage. IC Role / Device Role / Timing Role: Primary clamping device placed upstream of DC/DC converter input to limit transient voltage before regulation. Use Value: Clamps to 29.2V within nanoseconds, preventing damage to 36V-rated buck controllers and preserving system uptime. | Use Scenario: Shields high-speed CAN FD physical layer transceivers from ESD events on bus lines per ISO10605. IC Role / Device Role / Timing Role: Bi-directional TVS placed across CANH–CANL differential pair to absorb ±30kV contact discharge energy. Use Value: Maintains <1pF capacitance at 0V bias, avoiding signal integrity degradation at 5Mbps data rates. |
| Body Control Module (BCM) LIN Bus | ADAS Camera Power Rail |
Use Scenario: Secures LIN bus master node against battery reverse connection and alternator ripple-induced spikes. IC Role / Device Role / Timing Role: Bidirectional shunt element on LIN line referenced to chassis ground, triggered only during overvoltage. Use Value: Withstands repetitive 112V Pulse 2a events without parameter shift, ensuring 15+ year field reliability. | Use Scenario: Guards 5V/3.3V power rails feeding radar or camera modules exposed to under-hood EMI and thermal cycling. IC Role / Device Role / Timing Role: Secondary protection stage after primary fuse and LC filter, absorbing residual fast transients. Use Value: Operates continuously at +125°C ambient with full 600W rating, eliminating derating concerns in compact enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bi-directional automotive TVS applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18CA | No "Q" suffix - not AEC-Q101 qualified; RoHS-compliant but lacks PPAP support | Restricted to non-safety-critical consumer or industrial designs | Select when automotive qualification is unnecessary and cost is prioritized |
| TPSMBS18C-Q | Same SMB package, 18V VRWM, but higher 32.4V clamping at 20.5A; AEC-Q101 qualified | Higher clamping voltage reduces margin for 3.3V/5V downstream ICs | Prefer when higher surge current handling (>22A) is required despite elevated VC |
Compared with SMBJ18CA and TPSMBS18C-Q, SMBJ18CAQ-13-F delivers optimal balance of low clamping (29.2V), full AEC-Q101 compliance, and proven field reliability in safety-critical 12V power domains-making it the preferred choice for Tier 1 ECU and BCM designs.
Availability
SMBJ18CAQ-13-F is available at Aetrix Electronics and suitable for automotive engine control units, body control modules, infotainment head units, and ADAS camera systems requiring stable component supply across multi-year production cycles.
Supply support for SMBJ18CAQ-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 manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability components for automotive, industrial, and computing markets with over 50 years of power management expertise.
The SMBJ(AQ) series is engineered specifically for automotive-grade transient suppression, targeting ISO7637-2 and ISO10605 compliance in harsh environment ECUs, sensors, and communication interfaces.
FAQ
What does the 'Q' suffix in SMBJ18CAQ-13-F signify?
The 'Q' suffix denotes full AEC-Q101 qualification, including stress testing across temperature, humidity, and mechanical vibration profiles required for automotive production. It also confirms PPAP documentation readiness and manufacturing in IATF 16949-certified facilities-distinguishing it from commercial-grade SMBJ18CA variants.
Is SMBJ18CAQ-13-F unidirectional or bidirectional?
SMBJ18CAQ-13-F is bi-directional, as indicated by the 'C' in its part number. It provides symmetrical clamping for both positive and negative transients, making it suitable for protecting differential buses (e.g., LIN, CAN) and AC-coupled signal paths without polarity constraints.
What is the maximum clamping voltage and under what test condition?
The maximum clamping voltage is 29.2V, measured at 20.5A peak pulse current using the standardized 10×1000μs double-exponential waveform defined in IEC 61000-4-5 and ISO7637-2. This value is guaranteed across the full operating temperature range of −55°C to +175°C.
Can SMBJ18CAQ-13-F replace SMBJ18A in an existing automotive design?
No-SMBJ18A is unidirectional and lacks AEC-Q101 qualification. Replacing it with SMBJ18CAQ-13-F requires verifying circuit topology compatibility (e.g., grounding scheme, polarity assumptions) and updating qualification documentation to reflect the bi-directional behavior and automotive-grade validation status.
SMBJ18CAQ-13-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- DO-214AA, SMB
- Series:
- -
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMB
SMBJ18CAQ-13-F FAQ
1.How can I place an order for SMBJ18CAQ-13-F through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ18CAQ-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 SMBJ18CAQ-13-F reliable?
The price and inventory of SMBJ18CAQ-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 SMBJ18CAQ-13-F is usually 5 days.
3.What payment methods are accepted for SMBJ18CAQ-13-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ18CAQ-13-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ18CAQ-13-F?
SMBJ18CAQ-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ18CAQ-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 SMBJ18CAQ-13-F?
For technical support, including SMBJ18CAQ-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ18CAQ-13-F requirements.
6.How does Aetrix verify that SMBJ18CAQ-13-F is sourced from the original manufacturer or authorized distributors?
All SMBJ18CAQ-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 SMBJ18CAQ-13-F meets industry standards.
7.What is the process for return or replacement of SMBJ18CAQ-13-F?
All SMBJ18CAQ-13-F units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ18CAQ-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 SMBJ18CAQ-13-F part is unused and in its original packaging.
Return procedure for SMBJ18CAQ-13-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ18CAQ-13-F Tags
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ESD9B5.0ST5G
onsemi
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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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onsemi
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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