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Vishay General Semiconductor - Diodes Division SMB8J18C-E3/52
- Part No.:
- SMB8J18C-E3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J18C-E3/52.pdf
- Description:
- TVS DIODE 18VWM 32.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,274
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Product details
Overview
SMB8J18C-E3/52 from Vishay General Semiconductor is a bi-directional transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, designed for robust overvoltage protection of signal and power lines. It features a 18 V stand-off voltage (VWM), 29.2 V maximum clamping voltage (VC) at 27.4 A peak pulse current (IPPM), and 800 W peak pulse power (PPPM) with 10/1000 µs waveform - deployed in automotive sensor interfaces, industrial I/O modules, and telecom line protection.
For engineers reviewing the SMB8J18C-E3/52 datasheet, SMB8J18C-E3/52 pinout, SMB8J18C-E3/52 application, or SMB8J18C-E3/52 equivalent, key selection criteria include bi-directional clamping capability, AEC-Q101 qualification, low thermal resistance (RθJL = 20 °C/W), and compatibility with automated SMT placement on standard 0.2" × 0.2" copper pads.
Technical Context
This bi-directional TVS diode operates symmetrically across both polarities, enabling protection against voltage transients from either direction without polarity sensitivity. Its glass-passivated junction ensures stable breakdown behavior and low leakage (<1.0 µA at VWM), while the low incremental surge resistance supports fast energy dissipation during ESD or lightning-induced surges.
The device is rated for continuous operation from −55 °C to +150 °C junction temperature and meets MSL level 1 per J-STD-020 with 260 °C reflow peak. Its 72 °C/W junction-to-ambient thermal resistance requires careful PCB pad design - minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper per terminal - to sustain repetitive surge events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - maximum reverse stand-off voltage before clamping begins; defines safe operating range for protected circuitry |
| VBR (min/max) | 20.0 V / 22.1 V - breakdown voltage range at 1.0 mA test current; ensures reliable turn-on under transient stress |
| VC @ IPPM | 29.2 V at 27.4 A - clamping voltage during 10/1000 µs surge; limits voltage seen by downstream ICs |
| PPPM | 800 W - peak pulse power handling with 10/1000 µs waveform; determines survivability against IEC 61000-4-5 surges |
| ID @ VWM | ≤1.0 µA - reverse leakage at stand-off voltage; critical for low-power sensor and battery-backed circuits |
| TJ max. | +150 °C - maximum junction temperature; enables use in under-hood automotive and high-ambient industrial environments |
| RθJL | 20 °C/W - junction-to-lead thermal resistance; informs heatsinking requirements when mounted on PCB leads |
Pinout & Package
Package: DO-214AA (SMB), surface-mount, bi-directional configuration with no polarity marking - symmetrical terminals suitable for AC-coupled or bidirectional signal lines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Both terminals function identically; no cathode band - enables flexible PCB layout without orientation constraints |
| Case (body) | Thermal and mechanical interface | Plastic molded case with UL 94 V-0 rating; transfers heat to PCB copper pads via soldered leads |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and ADAS sensor interfaces |
| Glass passivated junction | Ensures stable VBR over lifetime and improved reliability vs. epoxy-passivated alternatives |
| MSL Level 1 (260 °C) | Compatible with standard lead-free reflow profiles without preconditioning or baking |
| Low clamping ratio (VC/VBR ≈ 1.35) | Minimizes overvoltage stress on protected ICs compared to higher-ratio TVS devices |
| Matte tin plated leads | Guarantees solderability per J-STD-002 and JESD 22-B102; passes JESD 201 Class 1A whisker test |
Applications
| Automotive Sensor Protection | Industrial RS-485 Interface |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bi-directional clamping element placed directly at connector entry point to shunt surge energy before reaching signal conditioning ICs. Use Value: Withstands 800 W surges and maintains ≤29.2 V clamping, preserving integrity of 3.3 V/5 V microcontrollers and ADC front-ends. |
Use Scenario: Safeguarding differential data lines in factory automation PLCs and motor drives exposed to inductive switching noise. IC Role / Device Role / Timing Role: Common-mode TVS pair across A/B lines to suppress EFT bursts and surge transients per IEC 61000-4-4/4-5. Use Value: Symmetrical 18 V VWM and low leakage (<1 µA) prevent signal distortion while enabling fail-safe communication during EMC stress. |
| Telecom Line Card Protection | Consumer USB Port ESD Suppression |
Use Scenario: Shielding Ethernet PHYs and DSL line drivers from lightning-induced surges on outdoor-facing ports. IC Role / Device Role / Timing Role: Primary-level TVS on line side of isolation transformer, coordinated with secondary-side protection. Use Value: 27.4 A IPPM and 20 °C/W RθJL allow rapid thermal dissipation into chassis ground, reducing risk of thermal runaway. |
Use Scenario: Adding robust ±15 kV contact / ±20 kV air ESD protection to USB 2.0 data lines in portable electronics. IC Role / Device Role / Timing Role: Low-capacitance bi-directional clamp placed between USB D+/D− and ground, minimizing signal integrity impact. Use Value: Clamps within nanoseconds to <29.2 V, preventing latch-up or gate oxide damage in USB transceivers without degrading 480 Mbps signaling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18CA-E3/52 | Same DO-214AA package and 18 V VWM, but rated for 1000 W PPPM (uni-directional only); not bi-directional | Requires polarity-aware layout; unsuitable for AC or floating signal lines | Select only if unidirectional protection suffices and higher power rating is needed |
| SMAJ18CA | DO-214AC (SMA) package; same 18 V VWM and bi-directionality, but lower 400 W PPPM and higher VC (32.4 V) | Smaller footprint but reduced surge margin; may require derating in high-energy environments | Prefer for space-constrained designs where 400 W surge capability is sufficient |
Compared with SMBJ18CA-E3/52 and SMAJ18CA, SMB8J18C-E3/52 uniquely delivers bi-directional 800 W surge protection in the SMB outline - balancing power handling, layout flexibility, and automotive qualification without polarity constraints.
Availability
SMB8J18C-E3/52 is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial RS-485 networks, and telecom line card protection requiring stable component supply, AEC-Q101 compliance, and consistent surge performance across production batches.
Supply support for SMB8J18C-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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and automotive-grade validation.
The SMB8J series belongs to Vishay's TRANSZORB® TVS portfolio, engineered specifically for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom infrastructure where AEC-Q101 compliance and repeatable clamping performance are mandatory.
FAQ
What is the polarity configuration of SMB8J18C-E3/52?
SMB8J18C-E3/52 is a bi-directional TVS diode with symmetrical terminals and no cathode marking. Unlike uni-directional variants, it conducts equally in both directions - making it ideal for AC-coupled signals, differential buses like RS-485, and floating sensor outputs where polarity cannot be guaranteed. This eliminates orientation errors during automated placement.
Does SMB8J18C-E3/52 meet automotive qualification standards?
Yes, SMB8J18C-E3/52 is AEC-Q101 qualified, as confirmed in Vishay document 88422. This certification validates its reliability under automotive temperature cycling, humidity, mechanical shock, and surge stress conditions - supporting deployment in engine control modules, body electronics, and ADAS sensor subsystems without additional qualification testing.
What is the maximum clamping voltage of SMB8J18C-E3/52 under surge conditions?
The maximum clamping voltage (VC) of SMB8J18C-E3/52 is 29.2 V at 27.4 A peak pulse current (IPPM), tested with the standard 10/1000 µs waveform. This value represents the highest voltage the device allows across protected lines during worst-case surge events - ensuring downstream 3.3 V or 5 V ICs remain within safe operating limits.
How does SMB8J18C-E3/52 differ from SMBJ18CA-E3/52?
SMB8J18C-E3/52 is bi-directional with 800 W PPPM, while SMBJ18CA-E3/52 is uni-directional with 1000 W PPPM. The "8" prefix denotes bi-directional construction; "J" indicates 1000 W rating class; "C" confirms bi-directionality. SMBJ18CA-E3/52 has a cathode band and cannot protect AC signals - making SMB8J18C-E3/52 the correct choice for polarity-agnostic applications.
What PCB layout guidance applies to SMB8J18C-E3/52 for optimal thermal performance?
For reliable thermal management, Vishay specifies minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal - matching the recommended mounting pad layout in document 88422. These pads must be directly connected to internal ground/power planes via multiple thermal vias. Failure to meet this requirement risks exceeding the 150 °C TJ limit during repetitive surges, leading to parametric drift or failure.
SMB8J18C-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:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 18V
- Voltage - Breakdown (Min):
- 20V
- Voltage - Clamping (Max) @ Ipp:
- 32.2V
- Current - Peak Pulse (10/1000µs):
- 24.8A
- Power - Peak Pulse:
- 800W
- 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 (SMB)
SMB8J18C-E3/52 FAQ
1.How can I place an order for SMB8J18C-E3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J18C-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 SMB8J18C-E3/52 reliable?
The price and inventory of SMB8J18C-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 SMB8J18C-E3/52 is usually 5 days.
3.What payment methods are accepted for SMB8J18C-E3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J18C-E3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J18C-E3/52?
SMB8J18C-E3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J18C-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 SMB8J18C-E3/52?
For technical support, including SMB8J18C-E3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J18C-E3/52 requirements.
6.How does Aetrix verify that SMB8J18C-E3/52 is sourced from the original manufacturer or authorized distributors?
All SMB8J18C-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 SMB8J18C-E3/52 meets industry standards.
7.What is the process for return or replacement of SMB8J18C-E3/52?
All SMB8J18C-E3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J18C-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 SMB8J18C-E3/52 part is unused and in its original packaging.
Return procedure for SMB8J18C-E3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J18C-E3/52 Tags
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