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Diodes Incorporated SMAJ18CAQ-13-F
- Part No.:
- SMAJ18CAQ-13-F
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ18CAQ-13-F.pdf
- Description:
- TVS DIODE 18VWM 29.2VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:34,175
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Product details
Overview
SMAJ18CAQ-13-F from Diodes Incorporated is a bi-directional 400W automotive transient voltage suppressor (TVS) diode designed for ISO7637-2 and ISO10605 surge/ESD protection on power and signal lines in vehicle ECUs. It features a 18V reverse standoff voltage (VRWM), 29.2V max clamping voltage at 13.7A peak pulse current, and AEC-Q101 qualification for under-hood applications.
For engineers reviewing the SMAJ18CAQ-13-F datasheet, SMAJ18CAQ-13-F pinout, SMAJ18CAQ-13-F application, or SMAJ18CAQ-13-F equivalent, this part delivers verified clamping performance for 12V/24V automotive bus protection, with documented IEC 61000-4-2 ESD immunity and ISO7637-2 Pulse 1/2a/3a/3b compliance - critical for ADAS camera modules, body control units, and infotainment power rails.
Technical Context
This bi-directional TVS operates symmetrically across both polarities to clamp transients exceeding ±18V without forward conduction, enabling robust protection of differential interfaces and ungrounded circuits. Its glass-passivated junction ensures stable breakdown behavior over temperature (-55°C to +175°C operating range) and long-term reliability under repetitive surge stress.
The device uses an 8.3ms half-sine waveform test condition per IEC 61000-4-5 and ISO7637-2, delivering 400W peak pulse power with 1.0W steady-state dissipation at TL = +75°C. Clamping occurs within nanoseconds, limiting induced overvoltage to ≤29.2V at IPP = 13.7A - sufficient to protect downstream 30V-rated MOSFETs and CAN transceivers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400W - sustains single 8.3ms surges up to 13.7A without failure, meeting ISO7637-2 Pulse 1 (-100V) and Pulse 3a (-150V) energy requirements. |
| Reverse Standoff Voltage | 18V - defines maximum continuous DC or AC working voltage before clamping initiates; matches nominal 12V automotive systems with margin. |
| Max Clamping Voltage | 29.2V @ IPP = 13.7A - limits transient voltage seen by protected ICs, ensuring compatibility with 30V-input power management ICs and microcontrollers. |
| Breakdown Voltage | 20.0–22.1V @ IT = 1.0mA - guarantees reliable turn-on above VRWM while avoiding false triggering during load dump overshoot. |
| Leakage Current | ≤0.5µA @ VRWM - negligible standby power loss and no interference with high-impedance sensor biasing or LIN bus signaling. |
| AEC-Q101 Qualified | Qualified per stress test schedule including HTGB, HTRB, TCT, and mechanical shock - required for production automotive ECU deployment. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, molded plastic UL 94V-0 housing; polarity indicator absent (bi-directional device); weight ≈ 0.064g; moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative polarity) | Accepts reverse surge current during negative transients (e.g., ISO7637-2 Pulse 1, Pulse 3a); symmetrical with Cathode. |
| Cathode | Transient current entry (positive polarity) | Accepts forward surge current during positive transients (e.g., ISO7637-2 Pulse 2a, Pulse 3b); symmetrical with Anode. |
Key Features
| Feature | Design Value |
|---|---|
| Bi-directional clamping | Enables single-device protection of floating or differential lines (e.g., CAN H/L, LIN, USB) without ground reference dependency. |
| Glass-passivated die | Ensures stable VBR over 1000+ thermal cycles and eliminates parameter drift due to humidity or contamination in engine bay environments. |
| AEC-Q101 qualification | Validates suitability for automotive safety-critical subsystems including powertrain, chassis, and ADAS - supports PPAP documentation. |
| Lead-free & halogen-free | Meets RoHS 3 (2015/863/EU) and automotive green standards (<900ppm Br, <900ppm Cl, <1000ppm Sb), enabling global vehicle homologation. |
Applications
| ADAS Camera Power Rail Protection | Body Control Module (BCM) LIN Bus |
|---|---|
|
Use Scenario: Protects 12V input to CMOS image sensor power supply against load dump and alternator ripple in rear-view and surround-view cameras. IC Role / Device Role / Timing Role: TVS diode placed upstream of DC/DC converter input to clamp transients before regulation stage. Use Value: Limits voltage excursion to ≤29.2V, preventing damage to 30V-rated buck controllers and preserving sensor startup integrity after ignition cycling. |
Use Scenario: Shields LIN transceiver PHY layer from ESD events during connector mating/unmating and board-level handling in door modules. IC Role / Device Role / Timing Role: Bi-directional TVS connected between LIN line and ground to absorb ±30kV contact discharge per ISO10605. Use Value: Sub-1ns response time prevents latch-up in LIN transceivers (e.g., TLE7259), maintaining bus communication during factory assembly and service. |
| Infotainment Head Unit USB Port | Electric Power Steering (EPS) Motor Driver |
|
Use Scenario: Guards USB 2.0 VBUS line in head units against hot-plug surges and conducted ESD from mobile devices. IC Role / Device Role / Timing Role: TVS placed directly at USB connector to shunt transients before USB controller IC. Use Value: 0.5µA leakage avoids VBUS droop during enumeration; 29.2V clamping protects 5V-tolerant USB PHYs without requiring additional series impedance. |
Use Scenario: Suppresses inductive kickback from 12V motor windings switching via H-bridge MOSFETs in EPS control units. IC Role / Device Role / Timing Role: TVS mounted across motor terminals to clamp flyback voltage during PWM commutation. Use Value: 400W peak rating handles repeated 100V+ spikes from 20A motor current interruption, extending MOSFET lifetime and reducing gate driver stress. |
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 |
|---|---|---|---|
| SMAJ18A-13-F | Uni-directional; cathode-banded; VF = 3.5V @ 35A; same VRWM/clamping but asymmetric conduction. | Requires explicit ground reference; unsuitable for floating/differential lines like CAN or LIN without redesign. | Select only if protecting grounded 12V rail with known polarity; avoid for bidirectional buses. |
| SMCJ18CA | Higher 1500W rating; DO-214AB package; 2.5× larger footprint; same VRWM/clamping but higher IPP (65.2A). | Overqualified for most ECU-level protection; used where higher surge repetition or industrial-grade margin is mandated. | Choose when system-level testing reveals >400W surge exposure or when legacy SMC layout exists. |
Compared with SMAJ18A-13-F, the SMAJ18CAQ-13-F enables simpler layout on differential buses without polarity constraints; versus SMCJ18CA, it offers space-constrained AEC-Q101 compliance in compact SMA footprint - ideal for modern automotive ECU miniaturization.
Availability
SMAJ18CAQ-13-F is available at Aetrix Electronics and suitable for automotive electronic control units, ADAS camera modules, and infotainment systems requiring stable component supply with full AEC-Q101 traceability and PPAP support.
Supply support for SMAJ18CAQ-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 for automotive, industrial, and consumer markets, with manufacturing certified to IATF 16949.
The SMAJ(C)AQ series targets automotive-grade transient suppression, engineered specifically for ISO7637-2 and ISO10605 compliance in harsh-temperature ECU environments - not general-purpose TVS use.
FAQ
What is the difference between SMAJ18CAQ-13-F and SMAJ18AQ-13-F?
SMAJ18CAQ-13-F is bi-directional (suffix 'C'), providing symmetrical clamping for both positive and negative transients - essential for differential buses like CAN or LIN. SMAJ18AQ-13-F is uni-directional (no 'C'), with a cathode band and forward conduction only; it requires a defined ground reference and cannot protect floating nodes.
Does SMAJ18CAQ-13-F meet ISO10605 for 30kV air and contact discharge?
Yes - per Diodes' DS40739 Rev. 17, the SMAJ(C)AQ series is explicitly rated for 30kV air and contact discharge per ISO10605 (C = 150pF, R = 330Ω). This is validated through manufacturer qualification testing and documented in the product summary section of the datasheet.
Can SMAJ18CAQ-13-F be used in non-automotive applications?
Yes - its 400W rating, low leakage, and wide temperature range make it suitable for industrial power supplies and telecom equipment. However, AEC-Q101 qualification, PPAP capability, and IATF 16949 manufacturing are automotive-specific advantages not required outside that domain.
What is the thermal derating behavior above +25°C ambient?
Per Figure 1 in DS40739, peak pulse power derates linearly: at +85°C TA, PPK drops to ~70% (280W); at +125°C, it falls to ~45% (180W). Steady-state power derates per Figure 6 - PM(AV) = 1.0W at TL = +75°C, falling to zero at TL = +175°C.
SMAJ18CAQ-13-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- DO-214AC, SMA
- 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):
- 13.7A
- Power - Peak Pulse:
- 400W
- 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:
- SMA
SMAJ18CAQ-13-F FAQ
1.How can I place an order for SMAJ18CAQ-13-F through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ18CAQ-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 SMAJ18CAQ-13-F reliable?
The price and inventory of SMAJ18CAQ-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 SMAJ18CAQ-13-F is usually 5 days.
3.What payment methods are accepted for SMAJ18CAQ-13-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ18CAQ-13-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ18CAQ-13-F?
SMAJ18CAQ-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ18CAQ-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 SMAJ18CAQ-13-F?
For technical support, including SMAJ18CAQ-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ18CAQ-13-F requirements.
6.How does Aetrix verify that SMAJ18CAQ-13-F is sourced from the original manufacturer or authorized distributors?
All SMAJ18CAQ-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 SMAJ18CAQ-13-F meets industry standards.
7.What is the process for return or replacement of SMAJ18CAQ-13-F?
All SMAJ18CAQ-13-F units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ18CAQ-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 SMAJ18CAQ-13-F part is unused and in its original packaging.
Return procedure for SMAJ18CAQ-13-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ18CAQ-13-F Tags
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