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Vishay General Semiconductor - Diodes Division SMBJ18CAHM3_A/I
- Part No.:
- SMBJ18CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ18CAHM3_A/I.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,240
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Product details
Overview
SMBJ18CAHM3_A/I from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on signal and power lines. It features a 18 V stand-off voltage (VWM), 20.0–22.1 V breakdown voltage (VBR) at 1 mA, 600 W peak pulse power (10/1000 µs), and clamps to ≤29.2 V at 20.5 A peak pulse current - deployed in industrial sensor interfaces and automotive ECUs for ESD and load-dump protection.
For engineers reviewing the SMBJ18CAHM3_A/I datasheet, SMBJ18CAHM3_A/I pinout, SMBJ18CAHM3_A/I application, or SMBJ18CAHM3_A/I equivalent, this page delivers verified electrical specs, bidirectional clamping behavior, thermal derating curves, AEC-Q101 qualification status, and direct replacement guidance for circuit-level surge protection design.
Technical Context
This device operates as a voltage-clamping protector with symmetrical bidirectional conduction - no polarity marking required. Its glass-passivated junction enables fast response (<1 ns), low incremental surge resistance, and stable clamping across -55 °C to +150 °C junction temperature range.
Rated for 600 W peak pulse power under 10/1000 µs waveform at 0.01% duty cycle, it delivers 29.2 V clamping voltage at 20.5 A IPPM while maintaining ≤1.0 µA reverse leakage at 18 V stand-off. Thermal resistance is 100 °C/W (junction-to-ambient) on standard 0.2" × 0.2" copper pads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 18 V - maximum continuous reverse voltage before significant leakage; defines operating margin below clamping threshold |
| VBR (Breakdown Voltage) | 20.0–22.1 V at 1 mA - guaranteed conduction onset; ensures predictable turn-on during transients |
| VC (Clamping Voltage) | ≤29.2 V at IPPM = 20.5 A - limits downstream voltage stress during 600 W surge events |
| PPPM (Peak Pulse Power) | 600 W (10/1000 µs) - sustains high-energy transients without failure; validated per IEC 61000-4-5 |
| ID (Reverse Leakage) | ≤1.0 µA at 18 V - negligible standby power loss and signal integrity impact in high-impedance circuits |
| TJ max. | +150 °C - supports operation in under-hood automotive and industrial environments |
| Package | SMB (DO-214AA) - surface-mount footprint compatible with automated assembly; MSL Level 1, 260 °C reflow |
Pinout & Package
Two-terminal bidirectional device in SMB (DO-214AA) package; no polarity marking. Cathode/anode designation does not apply - terminals are functionally symmetric for AC transient suppression.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Transient Input/Output Node | Connects to protected line (e.g., CAN_H, RS-485 A, sensor supply); conducts equally in both directions |
| Terminal 2 | Transient Input/Output Node | Completes bidirectional clamping path to reference (e.g., ground or rail); no cathode band or polarity dependency |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or differential signal lines (e.g., USB D+, D−, RS-485) without polarity concerns |
| 600 W peak pulse rating | Withstands IEC 61000-4-5 Level 4 surges (4 kV line-earth, 2 kV line-line) on properly laid out PCBs |
| AEC-Q101 qualified | Validated for automotive applications including engine control units, body electronics, and infotainment power rails |
| Halogen-free & RoHS-compliant (HM3 suffix) | Meets automotive environmental compliance requirements (e.g., ELV, JIG-001) without compromising surge robustness |
| Low clamping ratio (VC/VBR ≈ 1.46) | Minimizes overvoltage exposure to downstream ICs - critical for 3.3 V or 5 V logic interface protection |
Applications
| Automotive Sensor Interface | Industrial RS-485 Bus |
|---|---|
Use Scenario: Protecting analog output lines of pressure/temperature sensors in engine bay environments subject to ISO 7637-2 pulses and ESD. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed between sensor output and microcontroller ADC input. Use Value: Limits transient excursions to ≤29.2 V, preventing ADC saturation and latch-up in 3.3 V systems while surviving 100 A surge events. |
Use Scenario: Shielding RS-485 transceivers (e.g., SN65HVD230) against lightning-induced surges on factory floor cabling. IC Role / Device Role / Timing Role: Line-to-ground TVS on A/B differential pair, mounted adjacent to connector. Use Value: Clamps common-mode transients to <30 V within nanoseconds, preserving data integrity during 600 W surge events per IEC 61000-4-5. |
| Consumer USB Port Protection | DC Power Rail Surge Suppression |
Use Scenario: Safeguarding USB 2.0 data lines in portable medical devices exposed to human-body-model ESD (±15 kV air, ±8 kV contact). IC Role / Device Role / Timing Role: Bidirectional TVS on D+ and D− lines, placed before USB transceiver PHY. Use Value: Sub-1 ns response time prevents ESD energy from reaching sensitive PHY circuitry; 1.0 µA leakage avoids signal distortion. |
Use Scenario: Protecting 12 V DC input rails in industrial HMIs from load-dump transients (ISO 16750-2, 35 V/100 ms). IC Role / Device Role / Timing Role: Parallel-connected TVS between VIN and GND, sized for 600 W pulse handling. Use Value: Clamps 12 V rail to ≤29.2 V during 100 ms load dump, allowing downstream regulators to maintain regulation and avoid shutdown. |
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_A/I | RoHS-compliant but not halogen-free; lacks HM3's halogen-free certification | Suitable for commercial-grade industrial designs where halogen-free compliance is not mandated | Select when cost sensitivity outweighs automotive or green-material requirements |
| SMAJ18CAHM3_A/I | Lower 400 W PPPM rating; SMA package (DO-214AC), smaller footprint, higher RθJA (140 °C/W) | Better suited for space-constrained consumer PCBs with lower surge threat levels | Choose only if system-level testing confirms 400 W rating suffices and thermal margin permits higher junction rise |
Compared with SMBJ18CAHM3_A/I, SMBJ18CAHE3_A/I offers identical electrical performance but omits halogen-free assurance, while SMAJ18CAHM3_A/I trades 33% lower surge capacity and reduced thermal performance for board area savings - neither is pin-compatible due to differing package outlines (SMB vs. SMA).
Availability
SMBJ18CAHM3_A/I is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial RS-485 networks, and DC power rail surge protection requiring stable component supply across extended production lifecycles.
Supply support for SMBJ18CAHM3_A/I 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 and automotive qualification.
The SMBJ series targets high-reliability transient suppression in harsh environments - engineered for AEC-Q101 compliance, low clamping ratios, and robust surge handling in automotive, industrial, and telecom infrastructure.
FAQ
What is the clamping voltage of SMBJ18CAHM3_A/I at its rated peak pulse current?
The SMBJ18CAHM3_A/I clamps to a maximum of 29.2 V at its specified peak pulse current of 20.5 A (10/1000 µs waveform). This value is measured under standardized test conditions and guarantees upper-bound voltage stress on protected circuitry during surge events. The SMBJ18CAHM3_A/I maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C), making it suitable for under-hood automotive use.
Is SMBJ18CAHM3_A/I suitable for protecting bidirectional communication lines like CAN or RS-485?
Yes, SMBJ18CAHM3_A/I is explicitly designed for bidirectional applications - indicated by the "CA" suffix - and provides symmetrical clamping in both directions. Its 18 V stand-off and ≤29.2 V clamping align with ISO 11898-2 common-mode limits for high-speed CAN and RS-485 receiver input ranges. The SMBJ18CAHM3_A/I requires no polarity orientation during placement, simplifying layout for differential bus protection.
Does SMBJ18CAHM3_A/I meet automotive qualification standards?
Yes, SMBJ18CAHM3_A/I carries AEC-Q101 qualification, confirmed by its HM3 suffix and documentation in Vishay's official datasheet (Document Number: 88392, Revision: 09-Jan-2024). This qualification covers stress tests including HTGB, HTRB, TCT, and ESD, validating its suitability for automotive powertrain, chassis, and body electronics applications where long-term reliability under thermal and mechanical stress is mandatory.
How does the HM3 suffix differ from E3 or HE3 in SMBJ18CAHM3_A/I?
The HM3 suffix denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification - distinct from E3 (RoHS-compliant only) and HE3 (RoHS-compliant + AEC-Q101, but not halogen-free). All three share identical electrical specifications and SMB package dimensions, but SMBJ18CAHM3_A/I meets stricter environmental mandates such as EU ELV and JIG-001, making it preferred for Tier 1 automotive supply chains requiring full material compliance documentation.
What is the maximum reverse leakage current for SMBJ18CAHM3_A/I at its stand-off voltage?
The SMBJ18CAHM3_A/I exhibits a maximum reverse leakage current of 1.0 µA at its 18 V stand-off voltage (VWM), measured at 25 °C ambient. This ultra-low leakage preserves signal integrity in high-impedance sensor interfaces and minimizes quiescent power loss in battery-powered systems. The SMBJ18CAHM3_A/I maintains leakage below 5 µA up to 125 °C, ensuring stable performance across industrial temperature ranges.
SMBJ18CAHM3_A/I 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:
- 29.2V
- Current - Peak Pulse (10/1000µs):
- 20.5A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMBJ18CAHM3_A/I FAQ
1.How can I place an order for SMBJ18CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ18CAHM3_A/I 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 SMBJ18CAHM3_A/I reliable?
The price and inventory of SMBJ18CAHM3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ18CAHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMBJ18CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ18CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ18CAHM3_A/I?
SMBJ18CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ18CAHM3_A/I 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 SMBJ18CAHM3_A/I?
For technical support, including SMBJ18CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ18CAHM3_A/I requirements.
6.How does Aetrix verify that SMBJ18CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMBJ18CAHM3_A/I 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 SMBJ18CAHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMBJ18CAHM3_A/I?
All SMBJ18CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ18CAHM3_A/I, 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 SMBJ18CAHM3_A/I part is unused and in its original packaging.
Return procedure for SMBJ18CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ18CAHM3_A/I Tags
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