My Inquiry
My Account
Diodes Incorporated SMBJ18AQ-13-F
- Part No.:
- SMBJ18AQ-13-F
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ18AQ-13-F.pdf
- Description:
- TVS DIODE 18VWM 29.2VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:1,765
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMBJ18AQ-13-F from Diodes Incorporated is a unidirectional 600W surface-mount automotive transient voltage suppressor (TVS) diode with 18V reverse standoff voltage, 29.2V max clamping voltage at 20.5A peak pulse current, and AEC-Q101 qualification. It protects CAN, LIN, and power-line circuits in engine control units, body electronics, and infotainment systems against ISO7637-2 Pulse 1/2a/3a/3b transients and ISO10605 ESD events.
For engineers reviewing the SMBJ18AQ-13-F datasheet, SMBJ18AQ-13-F pinout, SMBJ18AQ-13-F application, or SMBJ18AQ-13-F equivalent, this part delivers verified clamping performance under automotive surge stress, supports IATF 16949-compliant production, and enables robust front-end protection in 12V/24V vehicle subsystems without derating concerns up to +175°C junction temperature.
Technical Context
This TVS diode operates as a unidirectional avalanche clamp, triggered when reverse voltage exceeds 18V standoff level and clamping within 1ns to limit downstream voltage to ≤29.2V during 10×1000μs transients. Its 600W peak pulse power rating is validated per REA-defined waveform with 4-pulse-per-minute duty cycle limitation.
Designed for automotive-grade reliability, it features -55°C to +175°C operating range, RoHS- and halogen-free "Green" construction, and SMB package with matte tin-plated terminals solderable per MIL-STD-202. It meets ISO10605 (30kV air/contact discharge) and ISO7637-2 (Pulse 1: -150V; Pulse 2a: +112V; Pulse 3a: -220V; Pulse 3b: +150V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 600W - Sustains single 10×1000μs surge without failure under defined test conditions |
| Reverse Standoff Voltage (VRWM) | 18.0V - Maximum continuous reverse voltage before significant leakage; sets minimum system operating margin |
| Breakdown Voltage (VBR) | 20.0–22.1V @ 1.0mA - Confirmed avalanche initiation range; ensures reliable turn-on before clamping threshold |
| Max Clamping Voltage (VC) | 29.2V @ IPP = 20.5A - Measured clamping limit during standardized transient; defines worst-case downstream voltage stress |
| Peak Pulse Current (IPP) | 20.5A - Maximum non-repetitive surge current supported at rated clamping voltage |
| Leakage Current (IR) | ≤0.5µA @ VRWM - Ultra-low reverse leakage preserves battery drain budget in always-on modules |
| Operating Temperature | -55°C to +175°C - Validated junction temperature range for under-hood and powertrain applications |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, molded plastic UL 94V-0 housing, 0.1g typical weight, moisture sensitivity level 1 per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction path / low-side reference | Connected to ground or low-impedance return; forms cathode-to-anode clamping path during reverse transients |
| Cathode | Transient voltage sensing / high-side connection | Connected to protected line (e.g., CAN_H, LIN, 12V rail); initiates avalanche breakdown when voltage exceeds VRWM |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive use with PPAP capability and IATF 16949 manufacturing control |
| ISO7637-2 & ISO10605 compliance | Passes Pulse 1 (-150V), Pulse 2a (+112V), Pulse 3a (-220V), Pulse 3b (+150V), and 30kV ESD testing |
| 600W peak pulse power | Handles high-energy transients common in 24V commercial vehicle systems without thermal runaway |
| Low clamping ratio (VC/VRWM = 1.62) | Minimizes overvoltage stress on downstream ICs compared to higher-ratio TVS devices |
| Halogen- and antimony-free "Green" construction | Meets automotive environmental mandates with <900ppm Br, <900ppm Cl, <1000ppm Sb |
Applications
| Engine Control Unit (ECU) Power Input | CAN Bus Physical Layer Protection |
|---|---|
Use Scenario: 12V battery feed to microcontroller power supply in gasoline/diesel ECUs exposed to load dump and alternator ripple. IC Role / Device Role: Unidirectional TVS clamp placed between input fuse and DC-DC converter input. Use Value: Limits transient voltage to ≤29.2V, preventing damage to 3.3V/5V LDOs and MCU VDD pins during ISO7637-2 Pulse 1 and Pulse 2a events. |
Use Scenario: Bidirectional protection on CAN_H/CAN_L lines in gateway modules subjected to ESD and coupled noise. IC Role / Device Role: Paired unidirectional SMBJ18AQ-13-F (CAN_H) and SMBJ18AQ-13-F (CAN_L) referenced to chassis ground. Use Value: Maintains signal integrity by clamping fast ESD spikes (30kV contact) while preserving <100pF line capacitance for 500kbps CAN FD operation. |
| Body Control Module (BCM) LIN Bus | Infotainment System USB/Power Line |
Use Scenario: LIN bus termination in door modules where wiring harnesses couple ignition noise and relay switching transients. IC Role / Device Role: Single SMBJ18AQ-13-F placed between LIN line and ground, upstream of transceiver. Use Value: Suppresses Pulse 3a (-220V) and Pulse 3b (+150V) surges without distorting 19.2kbps LIN signaling due to low dynamic impedance below 29.2V. |
Use Scenario: 5V USB VBUS and 12V display backlight power rails in head units exposed to hot-swap and cable discharge events. IC Role / Device Role: Primary overvoltage clamp on each rail, coordinated with polyfuse and local decoupling. Use Value: Absorbs 600W surge energy while holding rail voltage below 30V, avoiding latch-up or burnout of USB PD controllers and LED drivers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional automotive TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18A-13-F | No AEC-Q101 qualification; standard industrial grade; identical electrical specs and SMB package | Not approved for PPAP or automotive production; suitable for prototyping or non-safety-critical aftermarket designs | Select only if AEC-Q101 compliance and IATF 16949 traceability are not required |
| SMCJ18A-Q | Higher 1500W peak power; larger SMC (DO-214AB) package; same VRWM and VC | Used where higher surge margin is needed (e.g., alternator output lines); requires larger PCB footprint and thermal relief | Choose when system-level surge testing exceeds 600W or when design allows SMC footprint |
Compared with SMBJ18A-13-F, SMBJ18AQ-13-F adds automotive qualification and full production traceability; compared with SMCJ18A-Q, it trades surge capacity for space-constrained layouts in ECUs and sensors where 600W suffices.
Availability
SMBJ18AQ-13-F is available at Aetrix Electronics and suitable for engine control units, body electronics modules, infotainment power supplies, and CAN/LIN bus interfaces requiring stable component supply across automotive production lifecycles.
Supply support for SMBJ18AQ-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.
This device belongs to Diodes' AEC-Q101-qualified SMBJ-AQ automotive TVS family, engineered specifically for ISO7637-2 and ISO10605 compliance in harsh-temperature vehicle subsystems.
FAQ
What is the maximum clamping voltage of SMBJ18AQ-13-F at its rated peak pulse current?
The maximum clamping voltage is 29.2V measured at 20.5A peak pulse current using the 10×1000μs waveform defined in REA standards. This value is guaranteed across the full operating temperature range and represents the upper bound of voltage seen by downstream circuitry during surge events.
Is SMBJ18AQ-13-F suitable for bidirectional signal lines like CAN or LIN?
As a unidirectional device, SMBJ18AQ-13-F protects only positive-going transients on lines referenced to ground. For true bidirectional protection on CAN_H/CAN_L, two unidirectional units are used back-to-back, or a dedicated bi-directional part such as SMBJ18CAQ-13-F must be selected.
Does SMBJ18AQ-13-F require derating at elevated ambient temperatures?
Yes - its 600W peak pulse power is specified at TA = +25°C. Derating follows a linear curve: 4.8W/°C above +25°C. At +85°C ambient, peak pulse power drops to approximately 312W, which remains sufficient for most ISO7637-2 Pulse 3a/3b events.
How does the AEC-Q101 qualification impact manufacturing and traceability?
AEC-Q101 qualification confirms full stress testing (HTGB, HTRB, TCT, etc.) and mandates IATF 16949-certified production, PPAP documentation, lot-level traceability, and change control per automotive requirements. Every reel carries date code (YWW) and marking code (BT) aligned with Diodes' automotive product definitions.
SMBJ18AQ-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:
- 1
- Bidirectional Channels:
- -
- 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
SMBJ18AQ-13-F FAQ
1.How can I place an order for SMBJ18AQ-13-F through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ18AQ-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 SMBJ18AQ-13-F reliable?
The price and inventory of SMBJ18AQ-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 SMBJ18AQ-13-F is usually 5 days.
3.What payment methods are accepted for SMBJ18AQ-13-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ18AQ-13-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ18AQ-13-F?
SMBJ18AQ-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ18AQ-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 SMBJ18AQ-13-F?
For technical support, including SMBJ18AQ-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ18AQ-13-F requirements.
6.How does Aetrix verify that SMBJ18AQ-13-F is sourced from the original manufacturer or authorized distributors?
All SMBJ18AQ-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 SMBJ18AQ-13-F meets industry standards.
7.What is the process for return or replacement of SMBJ18AQ-13-F?
All SMBJ18AQ-13-F units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ18AQ-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 SMBJ18AQ-13-F part is unused and in its original packaging.
Return procedure for SMBJ18AQ-13-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ18AQ-13-F Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
