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Vishay General Semiconductor - Diodes Division SMBJ18CAHM3_A/H
- Part No.:
- SMBJ18CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ18CAHM3_A/H.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMBJ18CAHM3_A/H 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, 29.2 V maximum clamping voltage (VC) at 20.5 A peak pulse current (IPPM), and 600 W peak pulse power (10/1000 μs waveform), used to protect MOSFETs, ICs, and sensor signal lines in industrial and telecom equipment.
For engineers reviewing the SMBJ18CAHM3_A/H datasheet, SMBJ18CAHM3_A/H pinout, SMBJ18CAHM3_A/H application, or SMBJ18CAHM3_A/H equivalent, key selection criteria include bidirectional clamping capability, 29.2 V VC under 20.5 A surge, AEC-Q101 qualification status, halogen-free RoHS compliance (HM3 suffix), and SMB package thermal performance with RθJA = 100 °C/W.
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 ensures stable VBR tolerance (±5%) and low leakage (<1.0 μA at VWM), while the 10/1000 μs surge rating reflects standardized lightning and switching transient immunity per ANSI/IEEE C62.35.
The device delivers 600 W peak pulse power with minimal incremental surge resistance, achieving fast response time (<1.0 ps) and excellent clamping ratio (VC/VBR ≈ 1.46). Thermal design relies on 0.2" × 0.2" copper pads per terminal, supporting 5.0 W steady-state dissipation at TA = 50 °C and junction temperatures up to +150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse operating voltage before clamping begins; defines safe signal swing range. |
| VBR (min/max) | 20.0 V / 22.1 V at IT = 1 mA - Confirmed breakdown threshold ensuring reliable turn-on during overvoltage events. |
| VC @ IPPM | 29.2 V at 20.5 A - Clamped voltage seen by protected circuit during 10/1000 μs surge; limits stress on downstream components. |
| PPPM | 600 W - Peak transient energy absorption capacity under standardized lightning surge waveform. |
| Package | SMB (DO-214AA) - Surface-mount outline with 5.59 mm max length, 4.06 mm max width, and 2.20 mm max height for automated placement. |
| Compliance | AEC-Q101 qualified, halogen-free, RoHS-compliant (HM3 suffix) - Meets automotive reliability and environmental requirements. |
| TJ max. | +150 °C - Maximum junction temperature enabling operation in high-ambient industrial environments. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking. Terminals are matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102, meeting JESD 201 Class 2 whisker test.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative half-cycle) | Conducts surge current when voltage at this terminal falls ≥VBR below cathode potential. |
| Cathode | Transient current entry (positive half-cycle) | Conducts surge current when voltage at this terminal rises ≥VBR above anode potential. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC or differential lines without external polarity management. |
| 600 W peak pulse power | Withstands IEC 61000-4-5 Level 4 surges (4 kV line-earth) when properly mounted on 5.0 mm × 5.0 mm copper pads. |
| 29.2 V clamping voltage at 20.5 A | Limits voltage overshoot to safe levels for 3.3 V and 5 V logic interfaces, microcontrollers, and analog front-ends. |
| AEC-Q101 qualification | Validated for automotive subsystems including body electronics, infotainment power rails, and sensor interfaces. |
| Halogen-free & RoHS-compliant (HM3) | Meets EU Directive 2011/65/EU and IPC-1752A material declaration requirements for green manufacturing. |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
Use Scenario: Protection of gate drivers and current-sense amplifiers against inductive kickback from brushed DC motors and solenoids. IC Role / Device Role / Timing Role: Bidirectional TVS placed across motor driver output terminals to clamp ±100 V transients within 1 ns. Use Value: Prevents latch-up or permanent damage to 40 V-rated MOSFETs and op-amps by limiting transient voltage to ≤29.2 V. |
Use Scenario: Surge suppression on LIN bus lines and power supply inputs of door module ECUs exposed to load dump and jump-start conditions. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 12 V rail and bidirectional data line, responding to <1 ns edge rates. Use Value: Maintains communication integrity during ISO 7637-2 Pulse 5a (75 V/350 ms) by holding rail voltage below 30 V during clamping. |
| Telecom Power Supply Inputs | Consumer Sensor Signal Lines |
Use Scenario: Input-stage protection of AC/DC adapters and PoE injectors subjected to lightning-induced surges on primary-side rectifier outputs. IC Role / Device Role / Timing Role: Secondary-side TVS on +48 V DC output rail, coordinated with upstream MOVs and fuses. Use Value: Limits voltage excursion to 29.2 V during 600 W 10/1000 μs transients, preventing damage to DC-DC controllers and optocouplers. |
Use Scenario: ESD and cable discharge protection on I²C and UART lines connecting ambient light and motion sensors to host MCUs in smart home hubs. IC Role / Device Role / Timing Role: Low-capacitance (≈200 pF) bidirectional clamp placed directly at connector interface. Use Value: Passes IEC 61000-4-2 Level 4 (8 kV contact) without signal distortion or MCU reset due to precise 29.2 V clamping ceiling. |
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/H | RoHS-compliant but not halogen-free; lacks HM3's halogen-free certification. | Approved for commercial-grade industrial use but not automotive AEC-Q101 systems. | Select when halogen-free requirement is absent and cost optimization is prioritized. |
| SMAJ18CAHM3_A/H | Lower PPPM (400 W vs. 600 W); same VWM, VBR, and VC specs; SMA package (smaller footprint, higher RθJA). | Suitable for space-constrained PCBs where 400 W surge margin suffices and thermal budget allows higher junction rise. | Choose for compact designs with lower surge exposure or tighter board area constraints. |
Compared with SMBJ18CAHM3_A/H, SMBJ18CAHE3_A/H offers identical electrical performance but excludes halogen-free compliance, while SMAJ18CAHM3_A/H reduces surge robustness and thermal efficiency due to smaller package size-making SMBJ18CAHM3_A/H optimal for AEC-Q101 automotive and high-energy industrial transients.
Availability
SMBJ18CAHM3_A/H is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and telecom power supply inputs requiring stable component supply, long-term lifecycle support, and AEC-Q101-qualified surge protection.
Supply support for SMBJ18CAHM3_A/H 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 efficiency, and automotive-grade qualification.
The SMBJ series targets high-energy transient suppression in harsh environments, delivering 600 W surge capability in compact SMB packages for automotive, industrial, and telecom infrastructure applications.
FAQ
What is the clamping voltage of SMBJ18CAHM3_A/H at its rated peak pulse current?
The SMBJ18CAHM3_A/H has a maximum clamping voltage (VC) of 29.2 V at 20.5 A peak pulse current (IPPM) under the standard 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and ensures downstream components see limited overvoltage during surge events. The SMBJ18CAHM3_A/H maintains this clamping performance across its full operating temperature range of -55 °C to +150 °C.
Is SMBJ18CAHM3_A/H certified for automotive applications?
Yes, SMBJ18CAHM3_A/H is AEC-Q101 qualified, as indicated by the "HM3" suffix and confirmed in Vishay's ordering information table. This qualification validates its reliability for automotive subsystems including body electronics, lighting controls, and sensor interfaces. The SMBJ18CAHM3_A/H meets stress tests for temperature cycling, humidity, and mechanical shock required for under-hood and cabin-mounted modules.
How does the bidirectional configuration of SMBJ18CAHM3_A/H affect its circuit placement?
The SMBJ18CAHM3_A/H has no polarity marking and conducts symmetrically in both directions, allowing direct placement across AC-coupled lines, differential buses (e.g., RS-485), or ungrounded power rails without orientation concerns. Unlike unidirectional variants, it eliminates the need for cathode alignment during assembly and supports protection of floating nodes where voltage polarity reversal is possible. This simplifies layout and reduces BOM count in dual-polarity systems.
What is the thermal resistance of SMBJ18CAHM3_A/H, and how does it impact PCB layout?
The SMBJ18CAHM3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on minimum recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. To maintain TJ ≤ 150 °C at 5.0 W steady-state dissipation, designers must ensure adequate copper area and avoid thermal bottlenecks. The SMBJ18CAHM3_A/H datasheet specifies this pad layout as mandatory for rated power handling and derating curves.
Does SMBJ18CAHM3_A/H meet halogen-free and RoHS requirements?
Yes, SMBJ18CAHM3_A/H carries the "HM3" suffix, denoting halogen-free, RoHS-compliant construction per EU Directive 2011/65/EU and IPC-1752A. Its molding compound contains no brominated flame retardants, and terminals are matte tin-plated per J-STD-002. This makes the SMBJ18CAHM3_A/H suitable for green manufacturing programs and export to regions enforcing strict material restrictions.
SMBJ18CAHM3_A/H 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/H FAQ
1.How can I place an order for SMBJ18CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ18CAHM3_A/H 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/H reliable?
The price and inventory of SMBJ18CAHM3_A/H 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/H is usually 5 days.
3.What payment methods are accepted for SMBJ18CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ18CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ18CAHM3_A/H?
SMBJ18CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ18CAHM3_A/H 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/H?
For technical support, including SMBJ18CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ18CAHM3_A/H requirements.
6.How does Aetrix verify that SMBJ18CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMBJ18CAHM3_A/H 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/H meets industry standards.
7.What is the process for return or replacement of SMBJ18CAHM3_A/H?
All SMBJ18CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ18CAHM3_A/H, 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/H part is unused and in its original packaging.
Return procedure for SMBJ18CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ18CAHM3_A/H Tags
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