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Vishay General Semiconductor - Diodes Division SMB8J18CA-M3/52
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- Part No.:
- SMB8J18CA-M3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J18CA-M3/52.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,222
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Product details
Overview
SMB8J18CA-M3/52 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, making it suitable for automotive sensor interface and industrial I/O port protection.
For engineers reviewing the SMB8J18CA-M3/52 datasheet, SMB8J18CA-M3/52 pinout, SMB8J18CA-M3/52 application, or SMB8J18CA-M3/52 equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, 800 W peak pulse power rating, low incremental surge resistance, and halogen-free RoHS-compliant construction per M3 suffix.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector, responding within picoseconds to transient overvoltages induced by inductive switching or ESD events. Its glass-passivated junction ensures stable breakdown behavior and low leakage (<1.0 µA at 18 V), while the SMB package supports automated SMT placement and meets MSL level 1 reflow profile (260 °C peak).
The device is rated for bidirectional operation with symmetrical breakdown (20.0–22.1 V at 1 mA), 29.2 V maximum clamping voltage at 27.4 A, and thermal resistance of 72 °C/W (junction-to-ambient) on standard 0.2" × 0.2" copper pads - enabling reliable operation up to +150 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 18 V - Maximum continuous reverse working voltage before conduction begins; defines safe operating margin below clamping threshold. |
| VBR (Breakdown Voltage) | 20.0–22.1 V at 1 mA - Confirmed symmetric breakdown range for bidirectional operation; ensures predictable turn-on during surges. |
| VC (Clamping Voltage) | ≤29.2 V at IPPM = 27.4 A - Peak voltage seen by protected circuit during 10/1000 µs surge; determines downstream component stress. |
| PPPM (Peak Pulse Power) | 800 W - Maximum transient energy absorption capability under standardized 10/1000 µs waveform; defines surge robustness class. |
| ID (Reverse Leakage) | ≤1.0 µA at 18 V - Ultra-low leakage preserves signal integrity and minimizes standby power loss in high-impedance circuits. |
| TJ max. | +150 °C - Maximum allowable junction temperature; enables use in under-hood automotive and industrial environments. |
| AEC-Q101 Qualified | Yes - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per AEC specification. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking (unlike unidirectional variants which feature cathode band). Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H); terminals are matte tin-plated for J-STD-002 solderability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient shunt path | Both terminals function identically in bidirectional mode; no fixed anode/cathode - enables placement without orientation check. |
| Case (body) | Thermal and mechanical interface | Plastic body provides UL 94 V-0 flammability rating; copper pad layout (0.2" × 0.2") required to achieve rated 800 W power dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or differential signal lines (e.g., CAN, LIN, RS-485) without polarity concerns. |
| AEC-Q101 qualification | Validates suitability for automotive applications including engine control modules, ADAS sensors, and body electronics. |
| Halogen-free & RoHS-compliant (M3) | Meets global environmental compliance requirements and JESD201 Class 2 whisker resistance for long-term reliability. |
| Low clamping ratio (VC/VBR ≈ 1.39) | Minimizes overvoltage exposure to protected ICs - critical for safeguarding 3.3 V or 5 V logic interfaces against ISO 7637-2 pulses. |
| MSL Level 1 rating | Supports lead-free reflow up to 260 °C peak without preconditioning, simplifying manufacturing integration. |
Applications
| Automotive Sensor Interface | Industrial Digital I/O Protection |
|---|---|
Use Scenario: Protecting analog/digital outputs of pressure, temperature, or position sensors connected to vehicle ECUs exposed to load-dump and ISO 7637-2 transients. IC Role / Device Role: Shunt-type transient suppressor placed across sensor supply line or signal pair to clamp surges before reaching ASIC or microcontroller input. Use Value: Prevents latch-up or permanent damage to sensor front-end amplifiers and ADC inputs during 100 V/50 ms load-dump events. |
Use Scenario: Safeguarding PLC digital input modules receiving 24 V DC signals from field devices subject to inductive kickback and lightning-induced surges. IC Role / Device Role: Primary overvoltage clamp on input terminal block, coordinated with series impedance to limit current into optocoupler or Schmitt trigger input. Use Value: Maintains functional safety integrity by limiting transient voltage to <30 V, ensuring reliable detection without false triggering or component failure. |
| Telecom Line Interface | Consumer Appliance Control Board |
Use Scenario: Protecting RS-485 transceivers in building automation gateways connected to long cable runs susceptible to EFT and surge coupling. IC Role / Device Role: Bidirectional TVS placed across differential pair (A/B) and common-mode (GND) to suppress both differential and common-mode transients. Use Value: Enables >25 kV ESD contact immunity and 1 kV surge survivability per IEC 61000-4-5, preserving data link integrity. |
Use Scenario: Shielding microcontroller GPIOs and relay driver circuits on washing machine or HVAC control boards from motor commutation noise and power-line surges. IC Role / Device Role: Localized clamping device mounted adjacent to connector or relay coil to absorb fast-rising transients before propagation into logic domain. Use Value: Eliminates firmware resets and erratic actuator behavior caused by sub-100 ns transients exceeding MCU absolute maximum ratings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMB8J18A-M3/52 | Unidirectional variant; same VWM (18 V), VC (29.2 V), and PPPM (1000 W), but requires correct polarity orientation. | Suitable only where circuit topology enforces defined anode/cathode direction (e.g., DC power rail protection). | Select when protecting unidirectional DC paths and polarity alignment is guaranteed; avoids ambiguity in layout. |
| SMAJ18CA | Same VWM (18 V) and bidirectional function, but SMA package (smaller footprint, lower 600 W PPPM rating). | Limited to lower-energy transients; not recommended for automotive load-dump or industrial 1 kV surge requirements. | Choose for space-constrained consumer designs with moderate surge exposure; verify derated IPPM (22.2 A) meets system needs. |
Compared with SMB8J18CA-M3/52, the unidirectional SMB8J18A-M3/52 offers higher 1000 W surge capacity but demands strict polarity control, while SMAJ18CA sacrifices 200 W peak power and thermal margin for reduced board area - making SMB8J18CA-M3/52 optimal for balanced performance, automotive compliance, and layout flexibility.
Availability
SMB8J18CA-M3/52 is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, telecom line drivers, and appliance control boards requiring stable component supply with full AEC-Q101 traceability and halogen-free compliance.
Supply support for SMB8J18CA-M3/52 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, efficiency, and application-specific optimization.
The SMB8JxxCA series belongs to Vishay's TRANSZORB® TVS portfolio, engineered specifically for high-power-density, automotive-qualified transient suppression in harsh electromagnetic environments.
FAQ
What is the clamping voltage of SMB8J18CA-M3/52 at its rated peak pulse current?
The SMB8J18CA-M3/52 has a maximum clamping voltage (VC) of 29.2 V when subjected to its rated peak pulse current (IPPM) of 27.4 A under the standard 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and guarantees the protected circuit sees no more than 29.2 V during surge events - critical for safeguarding 3.3 V or 5 V logic interfaces. The SMB8J18CA-M3/52 maintains this performance across its full operating temperature range.
Is SMB8J18CA-M3/52 qualified for automotive applications?
Yes, SMB8J18CA-M3/52 is AEC-Q101 qualified, as confirmed by Vishay's documentation (Document Number: 88422, Revision: 09-Jan-2024). This qualification covers stress tests including high-temperature reverse bias, temperature cycling, and ESD, validating its use in automotive subsystems such as body control modules, ADAS sensors, and infotainment interfaces. The M3 suffix further confirms halogen-free and RoHS-compliant construction required for modern vehicle platforms. SMB8J18CA-M3/52 meets these requirements out-of-the-box.
How does SMB8J18CA-M3/52 differ from SMB10J18A-M3/52?
SMB8J18CA-M3/52 is a bidirectional TVS rated for 800 W peak pulse power and 27.4 A IPPM, while SMB10J18A-M3/52 is unidirectional with 1000 W rating and 34.2 A IPPM. Both share identical VWM (18 V) and VC (29.2 V), but the "8" prefix denotes lower surge rating and bidirectional symmetry, whereas "10" indicates higher unidirectional capability. SMB8J18CA-M3/52 is optimized for AC or differential signal protection; SMB10J18A-M3/52 suits DC rail clamping where polarity is fixed. SMB8J18CA-M3/52 eliminates orientation dependency in layout.
What is the thermal resistance of SMB8J18CA-M3/52, and how does it affect PCB layout?
The SMB8J18CA-M3/52 has a typical junction-to-ambient thermal resistance (RθJA) of 72 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal - as specified in Vishay's datasheet. This value assumes minimum recommended pad layout; reducing pad area increases thermal resistance and degrades surge handling. To maintain rated 800 W capability, designers must implement adequate copper pour and avoid excessive trace length between device terminals and ground/power planes. SMB8J18CA-M3/52 performance is directly tied to this thermal design.
Does SMB8J18CA-M3/52 require orientation during PCB assembly?
No, SMB8J18CA-M3/52 does not require orientation during PCB assembly because it is a bidirectional TVS diode with symmetrical electrical characteristics - both terminals perform identically under positive or negative transients. Unlike unidirectional variants (e.g., SMB8J18A-M3/52), it carries no cathode band marking and functions correctly regardless of placement direction. This simplifies automated pick-and-place and eliminates risk of polarity-related failures. SMB8J18CA-M3/52 is inherently orientation-agnostic in layout.
SMB8J18CA-M3/52 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 (SMBJ)
SMB8J18CA-M3/52 FAQ
1.How can I place an order for SMB8J18CA-M3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J18CA-M3/52 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-M3/52 reliable?
The price and inventory of SMB8J18CA-M3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J18CA-M3/52 is usually 5 days.
3.What payment methods are accepted for SMB8J18CA-M3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J18CA-M3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J18CA-M3/52?
SMB8J18CA-M3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J18CA-M3/52 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-M3/52?
For technical support, including SMB8J18CA-M3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J18CA-M3/52 requirements.
6.How does Aetrix verify that SMB8J18CA-M3/52 is sourced from the original manufacturer or authorized distributors?
All SMB8J18CA-M3/52 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-M3/52 meets industry standards.
7.What is the process for return or replacement of SMB8J18CA-M3/52?
All SMB8J18CA-M3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J18CA-M3/52, 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-M3/52 part is unused and in its original packaging.
Return procedure for SMB8J18CA-M3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J18CA-M3/52 Tags
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