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Vishay General Semiconductor - Diodes Division SMB8J18CA-E3/5B
- Part No.:
- SMB8J18CA-E3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J18CA-E3/5B.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMB8J18CA-E3/5B 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 18 V standoff voltage (VWM), 29.2 V 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-E3/5B datasheet, SMB8J18CA-E3/5B pinout, SMB8J18CA-E3/5B application, or SMB8J18CA-E3/5B equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, low clamping ratio (VC/VWM = 1.62), RoHS-compliant matte tin terminations, and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector, responding within <1 ps to transients induced by inductive switching or ESD events. Its glass-passivated junction ensures stable breakdown behavior and low incremental surge resistance, while the bidirectional configuration enables symmetrical clamping across both polarities without external polarity management.
Designed per ANSI/IEEE C62.35 standards, SMB8J18CA-E3/5B delivers repeatable performance under repetitive surge stress up to 150 °C junction temperature, with thermal resistance RθJA = 72 °C/W and RθJL = 20 °C/W - enabling reliable operation in compact PCB layouts with minimal heatsinking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - maximum continuous reverse operating voltage before conduction begins; defines safe signal line bias margin. |
| VBR min/max | 20.0 V / 22.1 V at 1.0 mA - precise breakdown threshold ensuring 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; VC/VWM = 1.62 ratio indicates high efficiency. |
| PPPM | 800 W - peak pulse power handling capacity with 10/1000 µs waveform; supports IEC 61000-4-5 Level 4 surge immunity. |
| ID @ VWM | 1.0 µA - ultra-low leakage preserves signal integrity and battery life in always-on sensor circuits. |
| TJ max | +150 °C - extended junction temperature rating enables use in under-hood automotive and industrial environments. |
| MSL Level | Level 1 (J-STD-020) - unrestricted floor life and reflow compatibility up to 260 °C peak, simplifying manufacturing. |
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. No polarity marking - bidirectional device with symmetrical terminal function.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient current path | Both terminals serve identical clamping roles; no cathode band marking required for bidirectional operation. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control modules and ADAS sensor interfaces per stress test requirements. |
| Glass-passivated junction | Ensures long-term stability of VBR and low parameter drift over temperature and lifetime cycling. |
| Low clamping ratio (VC/VWM) | 1.62 - minimizes voltage overshoot during surge, protecting 3.3 V and 5 V logic-level components downstream. |
| MSL Level 1 rating | Enables direct placement into high-temperature reflow without baking or special handling protocols. |
| Halogen-free option available | HM3 suffix variant meets environmental compliance mandates for green electronics manufacturing. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses in vehicle ECUs. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed directly at connector entry point to clamp surges before reaching signal conditioning circuitry. Use Value: Withstands 800 W surges and maintains 29.2 V clamping ceiling, preventing damage to 3.3 V/5 V microcontrollers and ADC front-ends. | Use Scenario: Safeguarding digital input/output channels of programmable logic controllers against field-induced transients from relay coils and motor drives. IC Role / Device Role / Timing Role: Bidirectional clamping element on 24 V DC I/O lines, absorbing both positive and negative polarity surges without polarity-sensitive layout. Use Value: 1.0 µA leakage at 18 V VWM avoids false triggering in high-impedance sensing circuits while supporting fast response to sub-nanosecond ESD events. |
| Consumer USB Port Protection | Telecom Line Interface Protection |
Use Scenario: Secondary-level surge suppression on USB 2.0 data lines and VBUS supply in set-top boxes and smart home hubs exposed to AC mains coupling. IC Role / Device Role / Timing Role: Low-capacitance TVS placed after primary common-mode choke to handle differential-mode surges without signal distortion. Use Value: SMB footprint enables dense routing; 29.2 V clamping protects USB PHY transceivers rated for 3.6 V absolute maximum while surviving 800 W pulses. | Use Scenario: Protecting Ethernet PHY interface pins and RS-485 transceivers in network edge devices subjected to lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Bidirectional shunt device mounted at board edge to divert surge energy away from communication ICs via shortest possible path to chassis ground. Use Value: AEC-Q101 qualification correlates with robustness under thermal cycling and vibration - critical for telecom infrastructure reliability. |
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-E3/5B | 1000 W PPPM (unidirectional rating only); same VWM/VC but higher IPPM (32.5 A) - not bidirectionally rated at 800 W. | Unidirectional variant requires polarity-aware layout; unsuitable where AC-coupled or bipolar signals exist. | Select SMBJ18CA-E3/5B only when unidirectional clamping suffices and higher single-polarity surge margin is needed. |
| SMAJ18CA-E3/5B | Lower PPPM (400 W), smaller SMA package (DO-214AC), higher RθJA (110 °C/W), and reduced surge current handling (16.3 A). | Limited to lower-energy transients; thermal derating required above 70 °C ambient in enclosed enclosures. | Choose SMAJ18CA-E3/5B only for space-constrained consumer designs with modest surge exposure and no automotive qualification requirement. |
Compared with SMBJ18CA-E3/5B and SMAJ18CA-E3/5B, SMB8J18CA-E3/5B uniquely balances 800 W bidirectional surge capability, AEC-Q101 qualification, and SMB package manufacturability - making it optimal for automotive and industrial applications demanding symmetrical protection without layout polarity constraints.
Availability
SMB8J18CA-E3/5B is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, and telecom line protection requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMB8J18CA-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, MOSFETs, and protection devices with emphasis on reliability, power density, and automotive-grade validation.
The SMB8JxxCA series belongs to Vishay's TRANSZORB® TVS family, engineered specifically for high-power-density, bidirectional surge suppression in harsh environments - targeting automotive, industrial, and infrastructure applications where AEC-Q101 compliance and repeatable clamping performance are mandatory.
FAQ
What is the clamping voltage of SMB8J18CA-E3/5B and how is it measured?
The SMB8J18CA-E3/5B has a maximum clamping voltage (VC) of 29.2 V, measured at 27.4 A peak pulse current (IPPM) using a standardized 10/1000 µs double-exponential surge waveform. This value is guaranteed per the Vishay datasheet (Document Number: 88422, Rev. 09-Jan-2024) and reflects the voltage seen across the SMB8J18CA-E3/5B terminals during worst-case transient conduction - critical for verifying downstream IC overvoltage margins.
Is SMB8J18CA-E3/5B suitable for automotive applications?
Yes, SMB8J18CA-E3/5B is AEC-Q101 qualified, meaning it has passed stress tests for temperature cycling, humidity, mechanical shock, and surge endurance required for automotive electronic systems. Its 150 °C maximum junction temperature, MSL Level 1 rating, and bidirectional clamping make SMB8J18CA-E3/5B appropriate for engine control units, body electronics, and ADAS sensor interfaces per ISO 16750 and ISO 7637-2 standards.
What does the "-E3/5B" suffix indicate in SMB8J18CA-E3/5B?
The "-E3" denotes RoHS-compliant, commercial-grade construction with matte tin-plated leads; "/5B" specifies packaging in 13-inch diameter plastic tape and reel containing 3200 units. This format ensures compatibility with high-speed pick-and-place equipment and satisfies IPC/JEDEC moisture sensitivity requirements without baking - a key detail for production planning of SMB8J18CA-E3/5B.
How does SMB8J18CA-E3/5B differ from unidirectional SMBJ18A variants?
SMB8J18CA-E3/5B is bidirectional with symmetrical clamping for AC or polarity-agnostic signals, whereas SMBJ18A is unidirectional and requires correct cathode orientation. SMB8J18CA-E3/5B has 800 W PPPM (bidirectional), while SMBJ18A offers 1000 W PPPM only in the reverse direction. The "C" in SMB8J18CA-E3/5B explicitly denotes bidirectional functionality - a critical distinction when selecting SMB8J18CA-E3/5B for balanced line protection.
What is the thermal resistance of SMB8J18CA-E3/5B and why does it matter?
SMB8J18CA-E3/5B has a typical junction-to-ambient thermal resistance (RθJA) of 72 °C/W and junction-to-lead (RθJL) of 20 °C/W. These values determine how effectively heat from surge dissipation transfers to the PCB and ambient air. Lower RθJL supports short-duration pulse handling, while RθJA guides layout decisions - e.g., using 0.2" × 0.2" copper pads per terminal (per datasheet fig. 2) ensures SMB8J18CA-E3/5B stays within its 150 °C TJ limit during repeated surges.
SMB8J18CA-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):
- 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-E3/5B FAQ
1.How can I place an order for SMB8J18CA-E3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J18CA-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 SMB8J18CA-E3/5B reliable?
The price and inventory of SMB8J18CA-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 SMB8J18CA-E3/5B is usually 5 days.
3.What payment methods are accepted for SMB8J18CA-E3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J18CA-E3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J18CA-E3/5B?
SMB8J18CA-E3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J18CA-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 SMB8J18CA-E3/5B?
For technical support, including SMB8J18CA-E3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J18CA-E3/5B requirements.
6.How does Aetrix verify that SMB8J18CA-E3/5B is sourced from the original manufacturer or authorized distributors?
All SMB8J18CA-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 SMB8J18CA-E3/5B meets industry standards.
7.What is the process for return or replacement of SMB8J18CA-E3/5B?
All SMB8J18CA-E3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J18CA-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 SMB8J18CA-E3/5B part is unused and in its original packaging.
Return procedure for SMB8J18CA-E3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J18CA-E3/5B Tags
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