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Vishay General Semiconductor - Diodes Division SMBJ18CA-E3/5B
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- Part No.:
- SMBJ18CA-E3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ18CA-E3/5B.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,025
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Product details
Overview
SMBJ18CA-E3/5B from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, rated for 18 V standoff voltage (VWM), 20.0–22.1 V breakdown voltage (VBR at 1 mA), and 600 W peak pulse power (10/1000 µs). It clamps transients to ≤29.2 V at 20.5 A peak surge current and is used to protect MOSFETs, sensor signal lines, and IC power rails in industrial and telecom equipment.
For engineers reviewing the SMBJ18CA-E3/5B datasheet, SMBJ18CA-E3/5B pinout, SMBJ18CA-E3/5B application, or SMBJ18CA-E3/5B equivalent, key selection criteria include bidirectional clamping capability, 29.2 V max clamping voltage at 20.5 A, 1.0 µA max reverse leakage at 18 V, -55 °C to +150 °C operating junction temperature, and RoHS-compliant matte tin-plated leads.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with identical VBR, VC, and IPPM specifications in forward and reverse directions. Its glass-passivated junction ensures stable avalanche characteristics and low incremental surge resistance under repetitive transient stress.
Designed for automated SMT placement, it meets MSL Level 1 per J-STD-020 (peak reflow 260 °C) and delivers 600 W pulse power handling on standard 5.0 mm × 5.0 mm copper pads. Thermal resistance is 100 °C/W (junction-to-ambient) and 20 °C/W (junction-to-lead), enabling reliable operation up to 150 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse stand-off voltage before significant conduction begins; defines safe operating margin below clamping threshold. |
| VBR (min/max) | 20.0 V / 22.1 V at 1 mA - Confirmed breakdown range ensuring predictable turn-on during overvoltage events. |
| VC @ IPPM | 29.2 V at 20.5 A - Clamping voltage under 10/1000 µs surge; limits downstream voltage stress to protected circuitry. |
| IPPM | 20.5 A - Peak pulse current capacity at rated waveform; determines survivability against defined transient energy. |
| Leakage (ID) | 1.0 µA max at 18 V - Minimal standby current ensures negligible power loss and no interference with high-impedance signal paths. |
| TJ Range | -55 °C to +150 °C - Full industrial temperature coverage without derating; supports operation in harsh environments. |
| Package | SMB (DO-214AA) - Standardized 2-pin surface-mount outline with 5.59 mm max length and 2.20 mm max height; compatible with automated pick-and-place. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional device with no polarity marking; symmetrical terminal configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative polarity event) | Conducts during negative-going surges; forms one half of symmetrical clamping path. |
| Anode | Transient current exit (positive polarity event) | Functions as cathode-equivalent during positive surges due to bidirectional structure; enables dual-polarity protection without external orientation constraints. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR, VC, and IPPM in both directions eliminates need for polarity-aware layout or external series components. |
| 600 W peak pulse power | Handles high-energy transients (e.g., ISO 7637-2 Pulse 1/2a/5a) without degradation when mounted on 5.0 mm × 5.0 mm copper pads. |
| Glass-passivated junction | Ensures stable avalanche characteristics over lifetime and temperature, minimizing parameter drift under repeated surge stress. |
| MSL Level 1 rating | Supports lead-free reflow up to 260 °C peak without moisture-induced damage; no bake-out required prior to assembly. |
| RoHS-compliant matte tin plating | Meets J-STD-002 and JESD 22-B102 solderability standards; passes JESD 201 Class 2 whisker test for long-term reliability. |
Applications
| Industrial Motor Drives | Automotive Sensor Interfaces |
|---|---|
|
Use Scenario: Protection of gate drivers and feedback signal lines against inductive kickback from relay coils and solenoid switching. IC Role / Device Role / Timing Role: Bidirectional TVS placed across motor control signal inputs and power supply rails to clamp ±1 kV EFT bursts. Use Value: Limits transient voltage to ≤29.2 V, preventing latch-up or permanent damage to 3.3 V/5 V microcontrollers and isolated gate drivers. |
Use Scenario: Shielding analog output lines of pressure, temperature, and position sensors from load-dump and jump-start transients. IC Role / Device Role / Timing Role: Placed at sensor module connector interface to suppress ±25 V/500 ms load-dump spikes per ISO 16750-2. Use Value: Maintains signal integrity by holding clamped voltage below ADC input absolute maximum ratings while surviving >1000 surge events. |
| Telecom Power Supplies | Consumer USB-C Port Protection |
|
Use Scenario: Safeguarding DC-DC converter inputs in base station power modules exposed to lightning-induced surges on AC mains or PoE lines. IC Role / Device Role / Timing Role: Primary-level TVS on 24 V/48 V input rail, coordinated with MOVs and gas discharge tubes for staged surge suppression. Use Value: Responds in <1 ps to limit let-through energy to <10 mJ, preserving upstream rectifier bridges and controller ICs during 6 kV/3 kA surge tests. |
Use Scenario: Protecting USB-C CC and VBUS lines in portable docking stations against ESD and hot-plug transients. IC Role / Device Role / Timing Role: Bidirectional clamping device placed directly at connector pins to shunt ±15 kV contact ESD (IEC 61000-4-2) and ±20 V hot-swap overshoot. Use Value: Achieves sub-1 ns response with <1.0 µA leakage, avoiding signal distortion on high-speed CC negotiation lines while meeting USB-IF compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18CA-M3/5B | Halogen-free, RoHS-compliant variant with identical electrical specs and SMB package; same thermal and surge performance. | No functional difference; selected where halogen-free material compliance is mandated by OEM environmental policy. | Choose SMBJ18CA-M3/5B when halogen-free certification is required; otherwise SMBJ18CA-E3/5B offers standard RoHS compliance at broader distributor availability. |
| SMCJ18CA-E3/57T | Higher-power 1500 W version in larger SMC (DO-214AB) package; VWM = 18 V, VC = 29.2 V, but IPPM = 51.0 A and RθJA = 50 °C/W. | Suitable for higher-energy threat environments (e.g., outdoor telecom, railway systems); requires larger PCB footprint and thermal management. | Select SMCJ18CA-E3/57T only when 600 W is insufficient-e.g., for IEC 61000-4-5 Level 4 (4 kV/2 Ω) testing-accepting increased board area and cost. |
Compared with SMBJ18CA-M3/5B, SMBJ18CA-E3/5B provides identical protection performance with standard RoHS compliance; versus SMCJ18CA-E3/57T, it trades lower surge capacity for compact SMB footprint and simplified thermal design in space-constrained consumer and industrial PCBs.
Availability
SMBJ18CA-E3/5B is available at Aetrix Electronics and suitable for industrial motor drives, automotive sensor interfaces, telecom power supplies, and consumer USB-C port protection requiring stable component supply and full traceability.
Supply support for SMBJ18CA-E3/5B 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
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SMBJ series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for robust, low-clamping transient suppression in automotive, industrial, and communications infrastructure where fast response and repeatable surge endurance are critical.
FAQ
What is the clamping voltage of SMBJ18CA-E3/5B at its rated peak pulse current?
The SMBJ18CA-E3/5B has a maximum clamping voltage (VC) of 29.2 V at its rated peak pulse current (IPPM) of 20.5 A under the standard 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and confirmed in Vishay's datasheet revision 09-Jan-2024 (Document Number: 88392). The SMBJ18CA-E3/5B maintains this clamping performance bidirectionally, making it suitable for protecting sensitive inputs against both positive and negative transients.
Is SMBJ18CA-E3/5B RoHS-compliant and lead-free?
Yes, SMBJ18CA-E3/5B is RoHS-compliant and lead-free, with matte tin-plated terminals that meet J-STD-002 and JESD 22-B102 solderability requirements. The "E3" suffix explicitly denotes commercial-grade, RoHS-compliant construction per Vishay's ordering nomenclature. The SMBJ18CA-E3/5B also passes JESD 201 Class 2 whisker testing and is rated MSL Level 1 for lead-free reflow up to 260 °C, confirming full process compatibility with modern SMT assembly lines.
How does SMBJ18CA-E3/5B differ from unidirectional SMBJ18A-E3/5B?
The SMBJ18CA-E3/5B is bidirectional, meaning it clamps symmetrically for both polarities with identical VBR, VC, and IPPM values, whereas SMBJ18A-E3/5B is unidirectional and features a cathode band marking with forward voltage drop (VF ≤ 3.5 V at 50 A). The SMBJ18CA-E3/5B has no polarity marking and is used where AC-coupled or dual-polarity signal lines require protection without orientation constraints-such as differential bus lines or transformer-isolated interfaces.
What is the maximum operating temperature for SMBJ18CA-E3/5B?
The SMBJ18CA-E3/5B has a specified operating junction temperature range of -55 °C to +150 °C, with storage temperature matching this span. Its thermal resistance is 100 °C/W (junction-to-ambient) on standard 0.2" × 0.2" copper pads, allowing full-rated 600 W pulse power operation up to +125 °C ambient when properly heatsinked. This makes SMBJ18CA-E3/5B suitable for under-hood automotive modules and industrial controllers where ambient temperatures exceed 85 °C.
Can SMBJ18CA-E3/5B be used in AEC-Q101 qualified designs?
No-SMBJ18CA-E3/5B is not AEC-Q101 qualified. It carries the "E3" commercial-grade suffix. For automotive-qualified equivalents, Vishay offers SMBJ18CAHE3_B/I (with "HE3" suffix), which is explicitly AEC-Q101 tested and certified. The SMBJ18CA-E3/5B lacks the extended temperature cycling, HTRB, and ESD validation required for automotive use, so it must be replaced with an HE3- or HM3-suffixed variant in AEC-Q101-compliant BOMs.
SMBJ18CA-E3/5B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- 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:
- DO-214AA (SMBJ)
SMBJ18CA-E3/5B FAQ
1.How can I place an order for SMBJ18CA-E3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ18CA-E3/5B 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-E3/5B reliable?
The price and inventory of SMBJ18CA-E3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ18CA-E3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ18CA-E3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ18CA-E3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ18CA-E3/5B?
SMBJ18CA-E3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ18CA-E3/5B 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-E3/5B?
For technical support, including SMBJ18CA-E3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ18CA-E3/5B requirements.
6.How does Aetrix verify that SMBJ18CA-E3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ18CA-E3/5B 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-E3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ18CA-E3/5B?
All SMBJ18CA-E3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ18CA-E3/5B, 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-E3/5B part is unused and in its original packaging.
Return procedure for SMBJ18CA-E3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ18CA-E3/5B Tags
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