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Diodes Incorporated SMBJ18A-13-F
- Part No.:
- SMBJ18A-13-F
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ18A-13-F.pdf
- Description:
- TVS DIODE 18VWM 29.2VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:107,660
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Product details
Overview
SMBJ18A-13-F from Diodes Incorporated is a unidirectional 600W surface-mount transient voltage suppressor (TVS) diode with 18.0V reverse standoff voltage, 20.0–23.3V breakdown range at 1.0mA test current, and 29.2V max clamping voltage at 20.5A peak pulse current. It protects DC power rails and I/O lines in industrial motor drives, telecom power supplies, and automotive body control modules against ESD and lightning-induced surges.
For engineers reviewing the SMBJ18A-13-F datasheet, SMBJ18A-13-F pinout, SMBJ18A-13-F application, or SMBJ18A-13-F equivalent, key selection criteria include clamping voltage margin relative to protected IC VDD, peak pulse current capability under 8.3ms half-sine waveform, thermal derating above +25°C, and SMB package compatibility with automated SMT assembly.
Technical Context
This TVS operates as a fast-acting shunt clamp: when transient voltage exceeds VRWM = 18.0V, it avalanches into low-impedance conduction within <1 ps response time, diverting surge current away from downstream circuitry. Its glass-passivated die ensures stable breakdown characteristics and long-term reliability under repetitive stress.
Designed for single-pulse transients per REA 10×1000 µs waveform, it delivers 600W peak pulse power at TA = +25°C, with linear derating of 4.8 W/°C above ambient and full functionality across –55°C to +150°C junction temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 600 W - sustains single 8.3ms surge without failure; enables protection of 24V industrial bus lines against IEC 61000-4-5 Level 4 (4kV) |
| Reverse Standoff Voltage | 18.0 V - maximum continuous DC operating voltage before clamping initiates; matches nominal 18V supply rails |
| Breakdown Voltage | 20.0–23.3 V @ 1.0 mA - tight VBR window ensures predictable turn-on with minimal overvoltage exposure |
| Max Clamping Voltage | 29.2 V @ 20.5 A - limits transient voltage seen by protected ICs to safe margin below 30V absolute maximum ratings |
| Package | SMB - standardized surface-mount outline (5.00–5.59 mm length, 3.30–3.94 mm width) compatible with IPC-7351B footprint |
| Operating Temperature | –55°C to +150°C - supports under-hood automotive and high-temperature industrial environments |
Pinout & Package
Two-terminal SMB package: Cathode band denotes terminal polarity; anode connects to ground or low-impedance return path, cathode to protected line. No internal pin numbering-device functions as bidirectional clamp only when explicitly marked "C" suffix (e.g., SMBJ18CA); SMBJ18A-13-F is unidirectional.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode Band | Transient Current Sink | Connects to protected signal/power line; conducts avalanche current during overvoltage events |
| Opposite Terminal | Anode / Reference Node | Must be tied to low-impedance ground or common return to complete clamping path |
Key Features
| Feature | Design Value |
|---|---|
| 600W Peak Pulse Power | Enables robust protection against high-energy transients (e.g., ISO 7637-2 Pulse 1/2/5a) without thermal runaway |
| Glass Passivated Die | Eliminates moisture-induced leakage drift and improves long-term stability in humid environments |
| Lead-Free & Halogen-Free | Meets RoHS 2 (2011/65/EU) and JEDEC J-STD-020 Level 1 moisture sensitivity requirements |
| Low Clamping Ratio | VC/VRWM = 29.2/18.0 ≈ 1.62 - minimizes overvoltage stress on downstream components during clamping |
Applications
| Industrial Motor Drives | Telecom Power Supplies |
|---|---|
Use Scenario: Protection of gate driver inputs and auxiliary 18V bias rails against switching-induced voltage spikes and load dump transients. IC Role / Device Role: Unidirectional shunt TVS placed between 18V rail and ground, clamping transients before they reach isolated gate drivers or op-amps. Use Value: Prevents latch-up or permanent damage to sensitive CMOS input stages during 100A/10ms inductive kick events. |
Use Scenario: Input-stage surge suppression on 18V DC-DC converter front-end in base station power modules exposed to lightning-induced surges. IC Role / Device Role: Primary overvoltage clamp on secondary-side output rail, coordinated with upstream MOV and fuse. Use Value: Limits transient overshoot to ≤29.2V, maintaining compliance with EN 61000-4-5 Class 4 immunity requirements. |
| Automotive Body Control Modules | Industrial PLC I/O Cards |
Use Scenario: Protection of LIN bus transceiver VCC pins and microcontroller GPIOs powered from 18V battery-derived supply in door module ECUs. IC Role / Device Role: Localized TVS mounted adjacent to each protected IC, minimizing trace inductance in clamping path. Use Value: Survives repeated ISO 16750-2 load dump pulses (up to 35V for 400ms) without degradation or leakage increase. |
Use Scenario: Field-side analog input protection on 18V-powered 4–20mA loop receivers subjected to accidental 24V miswiring or cable ESD events. IC Role / Device Role: First-line defense before precision instrumentation amplifier, reducing need for additional series resistance. Use Value: Maintains <5 µA leakage at 14.4V (80% VRWM), preserving measurement accuracy in 16-bit ADC systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ18A | Same SMB package, identical 18V VRWM, but higher VC = 29.7V @ 20.3A; 500W rating vs. 600W | Marginally lower surge handling; suitable where board space allows slight VC increase | Prefer when sourcing diversity required and 0.5V clamping margin is acceptable |
| Vishay SMA6J18A | Same SMB footprint, 18V VRWM, VC = 29.5V @ 20.4A; 600W rating, but higher IR = 10µA @ VRWM vs. 5µA | Higher leakage may affect ultra-low-power sensor nodes; otherwise functionally interchangeable | Choose for legacy Vishay design continuity; verify leakage impact in battery-powered edge nodes |
Compared with SMBJ18A-13-F, SMAJ18A offers slightly relaxed clamping performance and lower power rating, while SMA6J18A matches power but trades off leakage for broader vendor availability-both require validation of PCB layout parasitics due to identical SMB thermal and inductive constraints.
Availability
SMBJ18A-13-F is available at Aetrix Electronics and suitable for industrial motor drives, telecom power supplies, and automotive body control modules requiring stable component supply with full RoHS and halogen-free compliance.
Supply support for SMBJ18A-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, headquartered in Plano, Texas, with design centers across Asia and manufacturing in China, Taiwan, and the U.S.
SMBJ series TVS diodes are part of Diodes' circuit protection product line, engineered specifically for high-reliability transient suppression in harsh-environment power and signal interfaces.
FAQ
What is the polarity configuration of SMBJ18A-13-F?
SMBJ18A-13-F is a unidirectional TVS diode, indicated by the absence of "C" in its part number. It features a cathode band marking and conducts only when the cathode is at higher potential than the anode-ideal for DC rail protection where polarity is fixed. Bi-directional variants (e.g., SMBJ18CA) omit the band and clamp symmetrically.
Can SMBJ18A-13-F be used in parallel for higher surge current handling?
No-parallel connection is not recommended due to mismatched breakdown voltages causing current imbalance and premature failure of one device. For higher current needs, select a higher-rated TVS (e.g., 1500W P6SMB series) or implement staged protection with upstream fusing and downstream TVS arrays designed for current sharing.
What is the maximum allowable PCB trace length between SMBJ18A-13-F and protected IC?
To maintain effective clamping, total inductance of the TVS ground path must be ≤10 nH. For typical FR-4 PCBs, this limits trace length to ≤5 mm with 0.5 mm wide traces and solid ground plane beneath. Longer paths degrade clamping response and risk overshoot exceeding VC specification.
Does SMBJ18A-13-F meet AEC-Q200 stress testing requirements?
No-SMBJ18A-13-F is qualified for commercial temperature range (–55°C to +150°C) and RoHS compliance, but lacks AEC-Q200 qualification. For automotive-grade applications, Diodes offers the AEC-Q200-qualified P6SMB18A variant, which undergoes extended temperature cycling, humidity bias, and mechanical shock testing per automotive standards.
SMBJ18A-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:
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMB
SMBJ18A-13-F FAQ
1.How can I place an order for SMBJ18A-13-F through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ18A-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 SMBJ18A-13-F reliable?
The price and inventory of SMBJ18A-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 SMBJ18A-13-F is usually 5 days.
3.What payment methods are accepted for SMBJ18A-13-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ18A-13-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ18A-13-F?
SMBJ18A-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ18A-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 SMBJ18A-13-F?
For technical support, including SMBJ18A-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ18A-13-F requirements.
6.How does Aetrix verify that SMBJ18A-13-F is sourced from the original manufacturer or authorized distributors?
All SMBJ18A-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 SMBJ18A-13-F meets industry standards.
7.What is the process for return or replacement of SMBJ18A-13-F?
All SMBJ18A-13-F units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ18A-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 SMBJ18A-13-F part is unused and in its original packaging.
Return procedure for SMBJ18A-13-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ18A-13-F Tags
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