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Vishay General Semiconductor - Diodes Division SMB8J18CA-E3/52
- Part No.:
- SMB8J18CA-E3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J18CA-E3/52.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMB8J18CA-E3/52 from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for high-energy surge protection on 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 and industrial I/O protection.
For engineers reviewing the SMB8J18CA-E3/52 datasheet, SMB8J18CA-E3/52 pinout, SMB8J18CA-E3/52 application, or SMB8J18CA-E3/52 equivalent, this device is selected for robust ESD and lightning surge immunity in AEC-Q101-compliant systems where low clamping voltage, fast response (<1 ns), and bidirectional symmetry are critical for protecting sensitive analog front-ends and CAN/LIN transceivers.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, enabling protection of AC-coupled or differential signal paths without polarity constraints. Its glass-passivated junction delivers stable breakdown behavior under repetitive surge stress, and its MSL Level 1 rating supports lead-free reflow up to 260 °C.
The device meets AEC-Q101 qualification for automotive use and exhibits 1.0 µA max reverse leakage at 18 V (VWM), with thermal resistance RθJA = 72 °C/W and RθJL = 20 °C/W - confirming suitability for compact PCB layouts with limited copper area.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - maximum continuous reverse operating voltage before clamping begins; defines safe signal swing range for protected line |
| VBR min/max | 20.0 V / 22.1 V at 1.0 mA - verified breakdown threshold ensures predictable turn-on during overvoltage events |
| VC @ IPPM | 29.2 V at 27.4 A - clamping voltage limits downstream IC stress during 10/1000 µs surge; enables <12 V margin for 18 V rail systems |
| PPPM | 800 W - peak pulse power handling per 10/1000 µs waveform; supports IEC 61000-4-5 Level 4 (4 kV) surge immunity |
| ID @ VWM | 1.0 µA - ultra-low leakage preserves signal integrity and battery life in always-on sensor nodes |
| TJ max | +150 °C - extended junction temperature rating enables operation in under-hood automotive environments |
| Package | SMB (DO-214AA) - industry-standard surface-mount outline with 5.59 mm × 4.06 mm footprint and 2.20 mm height for automated placement |
Pinout & Package
Two-terminal bidirectional device in SMB (DO-214AA) package; no polarity marking on body. Cathode band absent - terminals are symmetrical and interchangeable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (1) | Surge current entry/exit path | Both terminals conduct identically during positive or negative transients; no DC bias dependency |
| Anode/Cathode (2) | Surge current return path | Completes low-inductance clamping loop; requires symmetric PCB layout for balanced impedance |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional symmetry | Enables single-device protection of AC signals, differential buses (e.g., RS-485, CAN), and ungrounded sensors without polarity concerns |
| AEC-Q101 qualified | Validated for automotive applications including engine control modules, ADAS camera links, and body electronics with lifetime reliability requirements |
| Low clamping ratio (VC/VBR ≈ 1.39) | Minimizes voltage overshoot during surge, reducing risk of gate oxide damage in downstream MOSFETs or ADC inputs |
| MSL Level 1, 260 °C peak | Supports standard lead-free reflow profiles without preconditioning; eliminates moisture-related popcorning risk |
| Glass-passivated junction | Ensures stable VBR over temperature and lifetime, with minimal parameter drift after 1000+ surge cycles |
Applications
| Automotive Sensor Interface | Industrial Digital I/O Protection |
|---|---|
|
Use Scenario: Protecting LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) in engine bay modules exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed between connector and transceiver input, responding within <1 ns to suppress transients up to 800 W. Use Value: Maintains signal fidelity below 29.2 V clamping while surviving >1000 surges per AEC-Q101 stress test, eliminating need for redundant protection stages. |
Use Scenario: Safeguarding PLC digital input channels connected to 24 V field wiring subject to inductive switching spikes and lightning-induced surges. IC Role / Device Role / Timing Role: Primary surge shunt mounted directly at connector entry point, diverting energy before reaching optocoupler or microcontroller GPIO. Use Value: Enables compliance with IEC 61000-4-4 (EFT) and IEC 61000-4-5 (surge) without external series impedance or filtering complexity. |
| Automotive Camera Link Protection | Consumer Audio Line Protection |
|
Use Scenario: Shielding MIPI CSI-2 differential pairs in rear-view cameras from ESD and cable discharge events during vehicle assembly and service. IC Role / Device Role / Timing Role: Low-capacitance bidirectional TVS placed across each differential pair, preserving signal integrity up to 1.5 Gbps. Use Value: Achieves <0.5 pF typical junction capacitance (per terminal) at zero bias - verified in Fig. 4 - minimizing signal distortion and jitter. |
Use Scenario: Guarding line-in/line-out jacks in smart speakers and AV receivers against user-handling ESD (IEC 61000-4-2 ±8 kV contact). IC Role / Device Role / Timing Role: Standoff-rated clamp installed between jack and codec, conducting only during overvoltage while remaining invisible to audio bandwidth. Use Value: Delivers 1.0 µA max leakage at 18 V, preventing DC offset or noise injection into high-impedance audio paths. |
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-E3/52 | Unchanged VWM (18 V) and VC (29.2 V), but rated for 600 W PPPM (vs. 800 W); lower IPPM (22.5 A) | Suitable for lower-energy surge environments (e.g., consumer USB ports), not recommended for automotive load-dump scenarios | Select SMBJ18CA-E3/52 only when system-level testing confirms 600 W surge margin is sufficient |
| SMCJ18CA-E3/52 | Same VWM and VC, but in larger SMC (DO-214AB) package; rated for 1500 W PPPM and 65.1 A IPPM | Required where higher surge endurance is mandated (e.g., industrial motor drives), but occupies 3× PCB area | Choose SMCJ18CA-E3/52 when board space permits and IEC 61000-4-5 Level 5 (6 kV) immunity is required |
Compared with SMBJ18CA-E3/52, SMB8J18CA-E3/52 delivers 33 % higher surge power handling in identical SMB footprint; versus SMCJ18CA-E3/52, it trades 43 % lower peak current capacity for 67 % smaller board area - making it optimal for space-constrained AEC-Q101 designs needing 800 W immunity.
Availability
SMB8J18CA-E3/52 is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O cards, and consumer audio interface protection requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMB8J18CA-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, and protection devices with emphasis on reliability, automotive qualification, and high-power density packaging.
The SMB8JxxCA series is part of Vishay's TRANSZORB® TVS platform engineered specifically for AEC-Q101-compliant bidirectional surge suppression in space-constrained automotive and industrial control applications.
FAQ
What is the clamping voltage of SMB8J18CA-E3/52 at its rated peak pulse current?
The SMB8J18CA-E3/52 has a maximum clamping voltage (VC) of 29.2 V when subjected to its specified peak pulse current (IPPM) of 27.4 A with a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 standards and ensures downstream circuitry remains below destructive voltage thresholds during surge events. The SMB8J18CA-E3/52 maintains this performance across its full operating temperature range of -55 °C to +150 °C.
Is SMB8J18CA-E3/52 RoHS-compliant and halogen-free?
Yes, SMB8J18CA-E3/52 carries the "E3" suffix, indicating it is RoHS-compliant and meets commercial-grade material requirements per Vishay's documentation. It is not halogen-free - that designation applies to "M3"-suffixed variants. The SMB8J18CA-E3/52 uses matte tin-plated leads and complies with J-STD-002 and JESD 22-B102 solderability standards, with whisker resistance certified to JESD 201 Class 2.
Does SMB8J18CA-E3/52 require a heatsink for standard operation?
No, SMB8J18CA-E3/52 does not require an external heatsink under normal transient conditions. Its thermal resistance (RθJA = 72 °C/W) is specified for mounting on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal - a standard layout achievable in most SMB-footprint designs. Continuous power dissipation is not applicable; the device is rated for non-repetitive pulses only, and junction temperature remains within 150 °C limit under datasheet-defined surge conditions.
How does SMB8J18CA-E3/52 differ from unidirectional SMB10J18A-E3/52?
SMB8J18CA-E3/52 is bidirectional with symmetrical clamping for both polarities, while SMB10J18A-E3/52 is unidirectional and conducts only in reverse bias. The SMB8J18CA-E3/52 has lower peak pulse power (800 W vs. 1000 W) and lower peak pulse current (27.4 A vs. 34.2 A), reflecting its dual-path conduction architecture. Both share identical VWM (18 V) and VC (29.2 V), but SMB8J18CA-E3/52 is preferred for AC-coupled or differential signal protection where polarity cannot be assumed.
Can SMB8J18CA-E3/52 be used in place of SMBJ18CA-E3/52?
SMB8J18CA-E3/52 can replace SMBJ18CA-E3/52 in most applications due to identical VWM (18 V), VBR (20.0–22.1 V), and VC (29.2 V), but offers 33 % higher peak pulse power (800 W vs. 600 W) and 22 % higher IPPM (27.4 A vs. 22.5 A). No PCB changes are needed - both use SMB (DO-214AA) package with identical footprint and soldering profile. However, verify system-level surge testing aligns with the higher energy capability of SMB8J18CA-E3/52.
SMB8J18CA-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:
- 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):
- 27.4A
- 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)
SMB8J18CA-E3/52 FAQ
1.How can I place an order for SMB8J18CA-E3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J18CA-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 SMB8J18CA-E3/52 reliable?
The price and inventory of SMB8J18CA-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 SMB8J18CA-E3/52 is usually 5 days.
3.What payment methods are accepted for SMB8J18CA-E3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J18CA-E3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J18CA-E3/52?
SMB8J18CA-E3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J18CA-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 SMB8J18CA-E3/52?
For technical support, including SMB8J18CA-E3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J18CA-E3/52 requirements.
6.How does Aetrix verify that SMB8J18CA-E3/52 is sourced from the original manufacturer or authorized distributors?
All SMB8J18CA-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 SMB8J18CA-E3/52 meets industry standards.
7.What is the process for return or replacement of SMB8J18CA-E3/52?
All SMB8J18CA-E3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J18CA-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 SMB8J18CA-E3/52 part is unused and in its original packaging.
Return procedure for SMB8J18CA-E3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J18CA-E3/52 Tags
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