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Vishay General Semiconductor - Diodes Division SMB8J18CAHE3/52
- Part No.:
- SMB8J18CAHE3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J18CAHE3/52.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,739
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Product details
Overview
SMB8J18CAHE3/52 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), 27.4 A peak pulse current (IPPM) under 10/1000 µs waveform, and clamps transients to ≤29.2 V at rated surge, meeting AEC-Q101 for automotive electronics.
For engineers reviewing the SMB8J18CAHE3/52 datasheet, SMB8J18CAHE3/52 pinout, SMB8J18CAHE3/52 application, or SMB8J18CAHE3/52 equivalent, key selection criteria include bidirectional clamping capability, 800 W peak pulse power rating, AEC-Q101 qualification, low thermal resistance (RθJL = 20 °C/W), and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This TVS diode uses a glass-passivated silicon junction optimized for fast response (<1 ns) to ESD and lightning-induced transients. Its bidirectional architecture enables symmetrical clamping across both polarities without external polarity management.
Designed per ANSI/IEEE C62.35, it delivers stable clamping performance up to 150 °C junction temperature and meets MSL Level 1 (260 °C reflow peak). The device operates with ≤1.0 µA reverse leakage at VWM and supports surge currents up to 27.4 A while maintaining VC ≤29.2 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse operating voltage before clamping initiates; defines safe signal line bias margin. |
| VBR (min/max) | 20.0 V / 22.1 V - Breakdown occurs within this range at 1 mA test current; ensures predictable turn-on threshold. |
| VC @ IPPM | ≤29.2 V - Clamped voltage during 27.4 A 10/1000 µs surge; determines protected circuit's maximum overvoltage exposure. |
| PPPM | 800 W - Peak pulse power handling under standard 10/1000 µs waveform; quantifies single-event surge energy absorption. |
| ID @ VWM | ≤1.0 µA - Reverse leakage at stand-off voltage; critical for low-power sensor and battery-backed interface integrity. |
| TJ max. | +150 °C - Maximum junction temperature; enables operation in under-hood automotive and industrial environments. |
| RθJL | 20 °C/W - Junction-to-lead thermal resistance; supports reliable power dissipation with minimal PCB copper area. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking. Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H); matte tin-plated leads compliant with J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Bidirectional terminals - either end serves as anode or cathode depending on transient polarity; no color band or marking required. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity testing, and mechanical shock per stress test requirements. |
| Glass passivated junction | Enhances long-term stability and moisture resistance versus epoxy-passivated alternatives; improves field reliability in humid environments. |
| MSL Level 1 | Rated for unlimited floor life and peak reflow temperature of 260 °C - compatible with standard lead-free SMT assembly processes. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., ISO 7637-2 Pulse 1/2a/5a), improving protection margin for downstream ICs. |
| UL 94 V-0 molding compound | Self-extinguishing encapsulation material - satisfies flammability safety requirements for automotive and industrial enclosures. |
Applications
| Automotive Sensor Protection | Industrial CAN Bus Interface |
|---|---|
Use Scenario: Protecting LIN/CAN transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and inductive switching transients in engine control units. IC Role / Device Role / Timing Role: Bidirectional clamping element placed directly at connector entry point to shunt surge energy before reaching signal conditioning circuitry. Use Value: Maintains signal integrity by limiting transient overvoltage to ≤29.2 V while surviving repeated 800 W surges - extends lifetime of 3.3 V/5 V microcontrollers and ADC front-ends. |
Use Scenario: Safeguarding CAN FD physical layer transceivers against ESD (IEC 61000-4-2) and coupled noise from adjacent high-current motor drives. IC Role / Device Role / Timing Role: Low-capacitance (typ. <100 pF) parallel protection device across differential CANH/CANL lines. Use Value: Enables robust communication up to 5 Mbps without signal distortion due to low dynamic impedance and sub-1 ns response time. |
| Consumer Power Adapter Input | Telecom DC Power Feeds |
Use Scenario: Secondary-side surge suppression on 12–24 V DC outputs of wall adapters and USB-PD power bricks exposed to mains-borne transients. IC Role / Device Role / Timing Role: Final-stage clamp after primary-side MOV and common-mode choke, absorbing residual differential-mode surges. Use Value: Prevents latch-up or gate oxide damage in downstream DC-DC controllers by clamping to ≤29.2 V at 27.4 A - complements upstream protection layers. |
Use Scenario: Protecting -48 V telecom power distribution boards from lightning-induced surges entering via outdoor cable runs. IC Role / Device Role / Timing Role: High-energy bidirectional suppressor mounted at power entry connector, rated for 800 W unidirectional-equivalent surge handling. Use Value: Survives multiple 10/1000 µs surges up to 27.4 A without degradation - validated per IEC 61000-4-5 Level 4 requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18CAHE3/52 | 1000 W PPPM (unidirectional rating only); same VWM/VBR/VC but higher peak power in unidirectional mode. | Not rated for bidirectional 800 W surges; requires polarity-aware layout and cannot replace SMB8J18CAHE3/52 in symmetric AC-coupled or floating interfaces. | Select only when circuit topology guarantees unidirectional surge polarity and higher single-polarity energy handling is required. |
| SMCJ18CAHE3/52 | Larger SMC (DO-214AB) package; 1500 W PPPM bidirectional rating; RθJA = 25 °C/W vs. 72 °C/W for SMB8J18CAHE3/52. | Requires larger PCB footprint (7.11 mm × 6.22 mm) and higher thermal mass; better suited for high-repetition-rate surges in power supply rails. | Choose when system-level surge duty cycle exceeds 1 Hz or when board space allows larger package for improved thermal margin. |
Compared with SMBJ18CAHE3/52 and SMCJ18CAHE3/52, SMB8J18CAHE3/52 offers optimal balance of compact SMB footprint, certified bidirectional 800 W capability, and AEC-Q101 qualification - making it the preferred choice for space-constrained automotive and industrial signal-line protection where polarity-agnostic clamping is mandatory.
Availability
SMB8J18CAHE3/52 is available at Aetrix Electronics and suitable for automotive sensor modules, industrial CAN networks, consumer power adapters, and telecom DC feeds requiring stable component supply with full traceability and AEC-Q101 compliance.
Supply support for SMB8J18CAHE3/52 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, power efficiency, and automotive-grade validation.
The SMB8J series is part of Vishay's TRANSZORB® TVS platform engineered specifically for high-density, AEC-Q101-compliant transient suppression in automotive and industrial signal integrity applications - prioritizing fast response, low clamping voltage, and robust thermal performance in compact packages.
FAQ
What is the peak pulse power rating of SMB8J18CAHE3/52?
The SMB8J18CAHE3/52 has a peak pulse power rating (PPPM) of 800 W under the standardized 10/1000 µs waveform. This value reflects its bidirectional surge-handling capability and is measured with the device mounted on 0.2" × 0.2" copper pads per JEDEC standards. It is lower than the 1000 W rating of unidirectional variants like SMB10J18A due to symmetrical junction design constraints.
Is SMB8J18CAHE3/52 suitable for automotive applications?
Yes, SMB8J18CAHE3/52 is AEC-Q101 qualified and explicitly designated for automotive use with the "HE3" suffix. It undergoes rigorous stress testing including temperature cycling, high-temperature reverse bias, and mechanical shock. Its 150 °C maximum junction temperature and MSL Level 1 rating make it appropriate for engine control, body electronics, and ADAS sensor modules.
What does the "CA" in SMB8J18CAHE3/52 indicate?
The "CA" suffix in SMB8J18CAHE3/52 denotes a bidirectional TVS diode configuration. Unlike "A"-suffixed unidirectional parts, "CA" devices provide symmetrical clamping for both positive and negative transients without requiring polarity-specific PCB layout. This is essential for protecting AC-coupled lines, differential buses (e.g., CAN, RS-485), and floating sensor interfaces.
How does SMB8J18CAHE3/52 differ from SMBJ18CAHE3/52?
SMB8J18CAHE3/52 is rated for 800 W bidirectional peak pulse power, while SMBJ18CAHE3/52 is rated for 1000 W unidirectional power only. Though both share identical VWM (18 V), VBR (20.0–22.1 V), and VC (≤29.2 V), the SMBJ variant lacks bidirectional surge validation and cannot safely handle reverse-polarity surges at full power - making SMB8J18CAHE3/52 the correct choice for polarity-agnostic protection.
What is the thermal resistance of SMB8J18CAHE3/52?
SMB8J18CAHE3/52 has a typical junction-to-lead thermal resistance (RθJL) of 20 °C/W and a junction-to-ambient resistance (RθJA) of 72 °C/W when mounted on 0.2" × 0.2" copper pads. This low RθJL enables efficient heat transfer to the PCB traces, supporting reliable operation during repetitive surge events without thermal runaway - especially important in enclosed automotive ECUs.
SMB8J18CAHE3/52 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMB8J18CAHE3/52 FAQ
1.How can I place an order for SMB8J18CAHE3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J18CAHE3/52 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 SMB8J18CAHE3/52 reliable?
The price and inventory of SMB8J18CAHE3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J18CAHE3/52 is usually 5 days.
3.What payment methods are accepted for SMB8J18CAHE3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J18CAHE3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J18CAHE3/52?
SMB8J18CAHE3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J18CAHE3/52 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 SMB8J18CAHE3/52?
For technical support, including SMB8J18CAHE3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J18CAHE3/52 requirements.
6.How does Aetrix verify that SMB8J18CAHE3/52 is sourced from the original manufacturer or authorized distributors?
All SMB8J18CAHE3/52 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 SMB8J18CAHE3/52 meets industry standards.
7.What is the process for return or replacement of SMB8J18CAHE3/52?
All SMB8J18CAHE3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J18CAHE3/52, 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 SMB8J18CAHE3/52 part is unused and in its original packaging.
Return procedure for SMB8J18CAHE3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J18CAHE3/52 Tags
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