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Vishay General Semiconductor - Diodes Division SMBJ18-E3/52
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- Part No.:
- SMBJ18-E3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ18-E3/52.pdf
- Description:
- TVS DIODE 18VWM 32.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,742
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Product details
Overview
SMBJ18-E3/52 from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping fast-rising voltage transients on power and signal lines. It features a 18 V stand-off voltage (VWM), 20.0–22.1 V breakdown voltage (VBR) at 1 mA, 29.2 V maximum clamping voltage (VC) at 20.5 A peak pulse current (IPPM), and 600 W peak pulse power (10/1000 μs waveform), protecting MOSFETs, ICs, and sensor interfaces in industrial power supplies.
For engineers reviewing the SMBJ18-E3/52 datasheet, SMBJ18-E3/52 pinout, SMBJ18-E3/52 application, or SMBJ18-E3/52 equivalent, key selection criteria include clamping performance under 10/1000 μs surge, unidirectional polarity with cathode band marking, thermal resistance (RθJA = 100 °C/W), and RoHS-compliant matte tin-plated leads suitable for automated SMT assembly.
Technical Context
This TVS diode operates as a voltage-clamping protection device triggered by reverse-biased avalanche breakdown. Its glass-passivated junction ensures stable VBR tolerance (±5 %) and low incremental surge resistance, enabling consistent clamping during repetitive transients up to 0.01 % duty cycle.
The SMBJ18-E3/52 is rated for -55 °C to +150 °C operating junction temperature, meets MSL Level 1 per J-STD-020 (260 °C peak reflow), and supports 100 A non-repetitive forward surge current (IFSM, 8.3 ms half-sine), making it suitable for high-energy transient suppression in DC power rails and I/O lines.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 18 V - Maximum continuous reverse voltage before significant leakage; defines safe operating margin below clamping threshold |
| VBR (Breakdown Voltage) | 20.0–22.1 V at 1 mA - Avalanche onset range; ensures reliable triggering above normal operating voltage |
| VC (Clamping Voltage) | 29.2 V at IPPM = 20.5 A - Peak voltage seen by protected circuit during 10/1000 μs surge; determines stress on downstream components |
| PPPM (Peak Pulse Power) | 600 W (10/1000 μs) - Transient energy handling capacity; enables robust protection against lightning-induced or inductive-switching surges |
| ID (Reverse Leakage) | 1.0 μA max at VWM - Low standby current minimizes power loss and avoids false triggering in low-power systems |
| RθJA | 100 °C/W - Thermal resistance from junction to ambient on standard 0.2" × 0.2" copper pads; guides PCB thermal design for reliability |
| Polarity | Unidirectional - Cathode marked by band; blocks forward conduction, clamps only reverse transients |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Polarity indicated by cathode band on one end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / transient return path | Connected to lower-potential side (e.g., GND or return rail); completes clamping loop during reverse surge |
| Cathode | Avalanche clamping node | Marked with band; connected to protected line (e.g., 12 V rail or signal input); conducts when voltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 μs) | Supports high-energy transient suppression without degradation across automotive and industrial surge test profiles |
| Glass passivated chip junction | Ensures stable VBR over temperature and lifetime, with ±5 % tolerance and low drift (<0.092 %/°C) |
| MSL Level 1 rating (260 °C peak) | Enables compatibility with standard lead-free reflow processes without preconditioning or special handling |
| RoHS-compliant, commercial-grade (E3 suffix) | Meets global environmental compliance requirements while maintaining cost-effective performance for non-automotive applications |
| Low incremental surge resistance | Minimizes voltage overshoot during fast transients, improving clamping precision for sensitive 3.3 V/5 V logic interfaces |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Protection of gate drivers and microcontroller I/O against inductive kickback from relay coils and solenoid loads. IC Role / Device Role: Unidirectional TVS placed between MCU GPIO and load switch output to clamp negative flyback spikes. Use Value: Limits transient voltage to ≤29.2 V, preventing latch-up or oxide damage in 5 V-tolerant I/O cells while supporting 100 A surge capability. |
Use Scenario: Input protection for LIN bus transceivers and sensor supply lines exposed to battery dump energy and load-dump events. IC Role / Device Role: Standoff-rated clamping device on 12 V sensor rail, absorbing ISO 7637-2 Pulse 1/2a/5a energy without crowbarring. Use Value: Maintains 18 V stand-off margin above nominal 12 V system, with 29.2 V clamping ensuring downstream 24 V-rated regulators remain within safe SOA. |
| Consumer Power Adapters | Telecom Interface Cards |
|
Use Scenario: Secondary-side overvoltage protection on DC output rails of AC/DC adapters subject to rectifier switching noise and ESD. IC Role / Device Role: Fast-response clamping element parallel to bulk capacitor, shunting transient energy before reaching USB-PD controller or load switch. Use Value: 20.5 A IPPM and 29.2 V VC ensure sub-100 ns response captures high-frequency ringing, preserving 5 V/9 V/12 V output regulation integrity. |
Use Scenario: Surge protection on RS-485 data lines and auxiliary power inputs in base station remote radio units. IC Role / Device Role: Line-side TVS on differential pair and VCC rail, coordinated with common-mode chokes to meet IEC 61000-4-5 Level 3 (2 kV) Use Value: 600 W PPPM and 100 °C/W RθJA allow sustained operation in sealed enclosures up to +85 °C ambient without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18A-E3/52 | Same electrical specs and package; identical marking code "LT" and VBR range (20.0–22.1 V); E3 suffix denotes same RoHS/commercial grade | No functional difference; direct manufacturer-equivalent part number variant with identical qualification and sourcing | Select SMBJ18A-E3/52 when cross-referencing Vishay's preferred P/N format; functionally interchangeable with SMBJ18-E3/52 |
| SMAJ18A-E3/52 | Lower PPPM (400 W vs. 600 W); same VWM/VBR/VC but higher RθJA (140 °C/W); SMA (DO-214AC) package with smaller footprint and lower thermal mass | Less robust for high-energy surges; limited to lower-duty-cycle or lower-ambient applications where space constraints outweigh power handling needs | Choose SMAJ18A-E3/52 only if board area is critical and surge threat level is ≤400 W; otherwise SMBJ18-E3/52 provides superior thermal and energy margin |
Compared with SMBJ18A-E3/52 (identical spec), SMBJ18-E3/52 offers no technical distinction but aligns with Vishay's legacy ordering nomenclature; versus SMAJ18A-E3/52, it delivers 50 % higher surge power handling and 29 % lower thermal resistance-critical for industrial and automotive environments with frequent transients.
Availability
SMBJ18-E3/52 is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, consumer power adapters, and telecom interface cards requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMBJ18-E3/52 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, rectifiers, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific optimization.
The SMBJ series was engineered for high-power, surface-mount transient suppression in harsh environments-targeting automotive, industrial, and telecom systems where compact size, repeatable clamping, and AEC-Q101 readiness are essential.
FAQ
What is the clamping voltage of SMBJ18-E3/52 at its rated peak pulse current?
The SMBJ18-E3/52 has a maximum clamping voltage (VC) of 29.2 V at its specified peak pulse current (IPPM) of 20.5 A under a 10/1000 μs waveform. This value represents the highest voltage that will appear across the SMBJ18-E3/52 during a standardized surge event, directly defining the protection level afforded to downstream circuitry. It is measured with the device mounted on 0.2" × 0.2" copper pads per JEDEC standards.
Is SMBJ18-E3/52 suitable for automotive applications?
The SMBJ18-E3/52 itself is a commercial-grade (E3 suffix), RoHS-compliant part and is not AEC-Q101 qualified. For automotive use, Vishay specifies the HE3 or HM3 variants (e.g., SMBJ18HE3). While SMBJ18-E3/52 shares identical electrical characteristics and package, its qualification status limits deployment to non-safety-critical industrial or consumer systems unless validated per customer-specific reliability requirements.
What does the "-E3/52" suffix indicate in SMBJ18-E3/52?
The "-E3" suffix denotes Vishay's RoHS-compliant, commercial-grade construction with matte tin-plated leads meeting J-STD-002 solderability and JESD 22-B102 whisker resistance (Class 2). The "/52" indicates packaging in 7" diameter plastic tape and reel, with a base quantity of 750 units per reel-standard for SMT automation and compatible with most pick-and-place equipment.
How does SMBJ18-E3/52 differ from bidirectional TVS diodes like SMBJ18CA?
SMBJ18-E3/52 is unidirectional and features a cathode band marking; it conducts only in reverse bias above VBR and blocks forward current. In contrast, SMBJ18CA is bidirectional with symmetrical clamping in both polarities and no polarity marking. SMBJ18-E3/52 is used where only negative transients occur (e.g., on positive supply rails), while SMBJ18CA suits AC-coupled or floating signal lines needing protection from both polarities.
What is the maximum operating temperature for SMBJ18-E3/52?
The SMBJ18-E3/52 has a specified operating junction temperature range of -55 °C to +150 °C. Its thermal resistance (RθJA = 100 °C/W) means that at 5.0 W steady-state power dissipation, the junction temperature rise above ambient would be 500 °C-well beyond rating-so it is intended for transient-only operation. Continuous power must remain below PD = 5.0 W, with derating above TA = 25 °C per Figure 2 in the datasheet.
SMBJ18-E3/52 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 18V
- Voltage - Breakdown (Min):
- 20V
- Voltage - Clamping (Max) @ Ipp:
- 32.2V
- Current - Peak Pulse (10/1000µs):
- 18.6A
- 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)
SMBJ18-E3/52 FAQ
1.How can I place an order for SMBJ18-E3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ18-E3/52 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 SMBJ18-E3/52 reliable?
The price and inventory of SMBJ18-E3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ18-E3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ18-E3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ18-E3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ18-E3/52?
SMBJ18-E3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ18-E3/52 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 SMBJ18-E3/52?
For technical support, including SMBJ18-E3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ18-E3/52 requirements.
6.How does Aetrix verify that SMBJ18-E3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ18-E3/52 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 SMBJ18-E3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ18-E3/52?
All SMBJ18-E3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ18-E3/52, 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 SMBJ18-E3/52 part is unused and in its original packaging.
Return procedure for SMBJ18-E3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ18-E3/52 Tags
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