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Vishay General Semiconductor - Diodes Division SMBJ18C-E3/5B
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- Part No.:
- SMBJ18C-E3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ18C-E3/5B.pdf
- Description:
- TVS DIODE 18VWM 32.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,602
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Product details
Overview
SMBJ18C-E3/5B from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on power and signal lines. It features 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). It protects MOSFETs, ICs, and sensor signal lines in industrial and telecom equipment.
For engineers reviewing the SMBJ18C-E3/5B datasheet, SMBJ18C-E3/5B pinout, SMBJ18C-E3/5B application, or SMBJ18C-E3/5B equivalent, key selection criteria include clamping voltage margin relative to protected circuit's absolute maximum rating, thermal resistance (RθJA = 100 °C/W), unidirectional polarity marking, RoHS-compliant matte tin plating, and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This TVS diode operates as a voltage-clamping protection device: under normal conditions it presents high impedance (>1 MΩ leakage at VWM), but conducts heavily when reverse voltage exceeds VBR, limiting transient energy by diverting surge current away from downstream components. Its glass-passivated junction ensures stable breakdown characteristics and low incremental surge resistance.
The SMBJ18C-E3/5B is rated for -55 °C to +150 °C operating junction temperature, meets MSL Level 1 per J-STD-020 (peak reflow 260 °C), and supports repetitive 0.01% duty cycle surges. It is not AEC-Q101 qualified - the HE3/HM3 suffix variants are required for automotive use.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - maximum continuous reverse working voltage before significant leakage; sets upper limit for safe operation in DC-biased circuits. |
| VBR min/max | 20.0 V / 22.1 V at IT = 1 mA - guaranteed breakdown range defining turn-on threshold; used to verify margin above VWM. |
| VC @ IPPM | 29.2 V at 20.5 A - clamped voltage during 10/1000 µs surge; must be below protected IC's absolute maximum rating. |
| PPPM | 600 W - peak pulse power handling capability; determines survivability against standardized lightning/surge waveforms. |
| ID @ VWM | 1.0 µA - reverse leakage at stand-off voltage; critical for low-power sensor or battery-backed circuits. |
| RθJA | 100 °C/W - junction-to-ambient thermal resistance on standard 0.2" × 0.2" pads; defines derating needed above 25 °C ambient. |
| Package | SMB (DO-214AA) - surface-mount outline with cathode band marking; compatible with JEDEC-standard reflow profiles. |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads, polarity indicated by cathode band on one end. Mounting requires 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal per Vishay recommended layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or lower-potential rail; completes conduction path during transient clamp event. |
| Cathode | High-side connection point | Marked with band; connected to protected line (e.g., 12 V supply or sensor output); reverse-biased during normal operation. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables robust protection against IEC 61000-4-5 Level 4 surges (4 kV line-earth) without derating on standard PCB pads. |
| Glass passivated chip junction | Ensures stable VBR over lifetime and temperature; eliminates parameter drift due to moisture or contamination ingress. |
| MSL Level 1 compliance | Allows single-reflow assembly without baking; peak reflow temperature up to 260 °C supported without degradation. |
| Low profile SMB package | 0.220" height enables compact layout in space-constrained industrial modules and telecom interface cards. |
| RoHS-compliant, commercial grade | E3 suffix confirms lead-free, halogen-free (except Cl/Br), and compliant with EU RoHS Directive 2011/65/EU Annex II. |
Applications
| Industrial Motor Drive Control | Telecom Line Interface Protection |
|---|---|
Use Scenario: Protecting gate drivers and logic inputs from inductive kickback during MOSFET switching in 24 V DC motor controllers. IC Role / Device Role / Timing Role: Unidirectional TVS placed between gate driver output and MOSFET gate, clamping negative transients to prevent gate oxide damage. Use Value: 29.2 V clamping voltage ensures gate-source voltage stays within ±20 V absolute max rating of common 30 V MOSFETs. |
Use Scenario: Shielding RS-485 transceiver I/O pins from ESD and lightning-induced surges on outdoor telecom links. IC Role / Device Role / Timing Role: TVS mounted directly at connector entry point, shunting transients before they reach transceiver ESD diodes. Use Value: 1.0 µA leakage at 18 V VWM avoids loading high-impedance bias networks in differential receiver inputs. |
| Automotive Body Control Module (Non-AEC) | Consumer Appliance Power Supply Input |
Use Scenario: Suppressing load dump spikes on 12 V supply rails feeding microcontrollers in non-safety-critical cabin modules. IC Role / Device Role / Timing Role: Primary clamping device on main 12 V input, coordinated with upstream fuse and downstream LC filter. Use Value: 600 W rating handles 12 V system load dump pulses (ISO 7637-2 Pulse 5a) with margin when paired with 500 ms thermal time constant. |
Use Scenario: Protecting AC-DC adapter primary-side controller ICs from mains-borne surges in white goods. IC Role / Device Role / Timing Role: Secondary-level TVS across DC bus after bridge rectifier, absorbing residual transients missed by MOV-based front-end. Use Value: 20.0–22.1 V VBR provides precise coordination with 24 V-rated controller ICs, avoiding false triggering during brownout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18A-E3/5B | Same VWM (18 V), identical SMB package and RoHS compliance; differs only in marking code (A vs C) - both denote unidirectional 18 V variant per Vishay documentation. | No functional difference; "A" and "C" suffixes are interchangeable part numbers for same electrical spec in this family. | Select SMBJ18A-E3/5B if legacy BOM references "A" suffix; no design or layout change required. |
| SMAJ18A-E3/52 | Lower PPPM (400 W vs 600 W), SMA package (smaller footprint, higher RθJA ≈ 140 °C/W), same VWM/VBR/VC specs. | Suitable for lower-energy transients or space-constrained layouts where 600 W margin is unnecessary. | Choose SMAJ18A-E3/52 only if board area is critical and surge threat level is ≤ IEC 61000-4-5 Level 3; verify thermal performance with reduced pad area. |
Compared with SMBJ18A-E3/5B, SMBJ18C-E3/5B offers identical protection performance and drop-in compatibility; versus SMAJ18A-E3/52, it delivers 50% higher surge power handling and superior thermal dissipation, making it preferred for industrial-grade reliability where full 600 W capability is specified.
Availability
SMBJ18C-E3/5B is available at Aetrix Electronics and suitable for industrial motor drives, telecom line interfaces, consumer appliance power supplies, and non-AEC automotive body control modules requiring stable component supply and repeatable surge immunity performance.
Supply support for SMBJ18C-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, rectifiers, TVS devices, and optoelectronics with emphasis on reliability, precision, and application-specific optimization.
The SMBJ series is engineered for high-energy transient suppression in harsh environments, targeting industrial automation, telecom infrastructure, and consumer electronics where robustness against ESD, lightning, and inductive switching surges is mandatory.
FAQ
What is the clamping voltage of SMBJ18C-E3/5B at its rated peak pulse current?
The SMBJ18C-E3/5B has a maximum clamping voltage (VC) of 29.2 V at 20.5 A peak pulse current (IPPM), measured under the standard 10/1000 µs waveform. This value is critical for ensuring the protected circuit remains below its absolute maximum voltage rating during surge events, and is verified per Vishay Document Number 88392, page 2.
Is SMBJ18C-E3/5B suitable for automotive applications requiring AEC-Q101 qualification?
No, SMBJ18C-E3/5B is a commercial-grade part with E3 suffix and is not AEC-Q101 qualified. For automotive use, select the SMBJ18AHE3_B or SMBJ18AHM3_B variants - these carry HE3 or HM3 suffixes and are explicitly qualified per AEC-Q101, as stated in the Vishay ordering information table on page 3 of document 88392.
How does the SMBJ18C-E3/5B differ from SMBJ18A-E3/5B?
SMBJ18C-E3/5B and SMBJ18A-E3/5B are functionally identical unidirectional TVS diodes with matching VWM (18 V), VBR (20.0–22.1 V), VC (29.2 V), and PPPM (600 W). The "A" and "C" suffixes denote alternate marking codes for the same electrical specification within Vishay's SMBJ family, confirmed in the device marking column of the Electrical Characteristics table (page 2).
What is the thermal resistance and how does it affect SMBJ18C-E3/5B layout?
The SMBJ18C-E3/5B has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" copper pads per terminal. This means each watt of sustained power dissipation raises junction temperature by 100 °C above ambient - so for reliable operation at 50 °C ambient, average power must stay below 1.0 W to keep TJ ≤ 150 °C maximum.
Can SMBJ18C-E3/5B be used in bidirectional signal line protection?
No - SMBJ18C-E3/5B is unidirectional, with polarity marked by a cathode band. For bidirectional protection (e.g., USB D+/D− or RS-232 lines), use the CA-suffixed variant SMBJ18CA-E3/5B, which provides symmetrical clamping in both directions and has no polarity marking, as specified in the "DEVICES FOR BIDIRECTION APPLICATIONS" section on page 1.
SMBJ18C-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:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- 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)
SMBJ18C-E3/5B FAQ
1.How can I place an order for SMBJ18C-E3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ18C-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 SMBJ18C-E3/5B reliable?
The price and inventory of SMBJ18C-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 SMBJ18C-E3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ18C-E3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ18C-E3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ18C-E3/5B?
SMBJ18C-E3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ18C-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 SMBJ18C-E3/5B?
For technical support, including SMBJ18C-E3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ18C-E3/5B requirements.
6.How does Aetrix verify that SMBJ18C-E3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ18C-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 SMBJ18C-E3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ18C-E3/5B?
All SMBJ18C-E3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ18C-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 SMBJ18C-E3/5B part is unused and in its original packaging.
Return procedure for SMBJ18C-E3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ18C-E3/5B Tags
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Diodes Incorporated
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