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Vishay General Semiconductor - Diodes Division SMBG18CAHE3/52
- Part No.:
- SMBG18CAHE3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AA, SMB Gull Wing
- Datasheet:
-
SMBG18CAHE3/52.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO215AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,635
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Product details
Overview
SMBG18CAHE3/52 from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMBG (DO-215AA) package, designed for clamping voltage transients on signal and power lines. It features 18 V standoff voltage (VWM), 20.0–22.1 V breakdown voltage (VBR) at 1 mA, 600 W peak pulse power (10/1000 μs), <1.0 μA reverse leakage at VWM, and 27.6 V maximum clamping voltage (VC) at 21.7 A peak pulse current - deployed in automotive sensor protection and industrial I/O interfaces.
For engineers reviewing the SMBG18CAHE3/52 datasheet, SMBG18CAHE3/52 pinout, SMBG18CAHE3/52 application, or SMBG18CAHE3/52 equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, DO-215AA mechanical dimensions, bidirectional clamping behavior, and direct alternatives with documented parameter divergence.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with identical VBR, VC, and IPPM specifications in either direction. Its glass-passivated junction ensures stable avalanche characteristics and low incremental surge resistance under repetitive 10/1000 μs transients at 0.01% duty cycle.
Thermal performance is defined by RθJA = 100 °C/W (on 5.0 mm × 5.0 mm copper pads) and TJ(max) = +150 °C, supporting operation in under-hood automotive environments. The device meets J-STD-020 MSL Level 1 and is qualified to AEC-Q101 for automotive-grade reliability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse operating voltage before clamping begins; sets safe interface voltage ceiling for protected circuitry. |
| VBR (min/max) | 20.0 V / 22.1 V at IT = 1 mA - Confirmed breakdown threshold range defining reliable avalanche initiation point in both directions. |
| VC @ IPPM | 27.6 V at 21.7 A - Clamped voltage during 600 W transient; determines maximum stress imposed on downstream ICs or MOSFETs. |
| IPPM | 21.7 A - Peak pulse current capability under 10/1000 μs waveform; defines surge energy handling limit per event. |
| Leakage (ID) | <1.0 μA at 18 V - Negligible standby power loss and signal integrity impact in high-impedance sensor or communication lines. |
| Package | SMBG (DO-215AA) - Surface-mount, low-profile package with 5.97 mm × 4.06 mm footprint and 2.16 mm height; optimized for automated placement and thermal pad layout. |
| AEC-Q101 | Qualified - Validated for automotive applications including engine control units, ADAS sensors, and body electronics requiring extended temperature and life-cycle reliability. |
Pinout & Package
Package: SMBG (DO-215AA), bidirectional configuration - no polarity marking; symmetrical terminals with identical electrical behavior in both directions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode/Cathode (bidirectional) | Either terminal serves as anode or cathode depending on transient polarity; no fixed polarity - enables single-device protection of AC or differential lines. |
| Terminal 2 | Anode/Cathode (bidirectional) | Electrically identical to Terminal 1; forms symmetrical clamping path - eliminates need for orientation-aware placement on PCB. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 μs) | Handles high-energy ESD and load-dump transients common in 12 V automotive systems without degradation over rated lifetime. |
| Glass-passivated junction | Ensures consistent avalanche characteristics, low leakage drift over temperature, and long-term stability in harsh industrial environments. |
| MSL Level 1 (260 °C peak reflow) | Supports standard lead-free SMT assembly without moisture-related popcorning or delamination risk. |
| AEC-Q101 qualification | Validated for automotive use including temperature cycling, HTRB, and accelerated life testing - required for safety-critical ECUs and ADAS modules. |
| Low clamping ratio (VC/VBR ≈ 1.25) | Minimizes overvoltage exposure to protected ICs - critical for safeguarding 3.3 V or 5 V logic interfaces adjacent to noisy power domains. |
Applications
| Automotive Sensor Protection | Industrial I/O Interface |
|---|---|
|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) from ISO 7637-2 pulse 1/2a/5a transients in vehicle chassis. IC Role / Device Role / Timing Role: Bidirectional clamping element placed directly at connector entry point to shunt surge energy before reaching signal conditioning ICs. Use Value: Maintains signal integrity under ±25 V transients while limiting clamped voltage to ≤27.6 V - preserving 5 V rail tolerance of downstream op-amps and ADCs. |
Use Scenario: Safeguarding RS-485/RS-232 transceivers and PLC digital inputs against lightning-induced surges and inductive switching spikes in factory automation. IC Role / Device Role / Timing Role: Primary line-level transient suppressor mounted on PCB edge connectors or terminal blocks to absorb >500 W surge events. Use Value: Enables robust 24 V system operation with <1.0 μA leakage - avoids false triggering in high-impedance dry-contact inputs and preserves noise margin. |
| Consumer Power Adapter Input | Automotive Body Control Module |
|
Use Scenario: Secondary-side overvoltage suppression in AC/DC adapters and USB PD chargers exposed to mains-borne surges and hot-plug transients. IC Role / Device Role / Timing Role: Fast-response clamp parallel to DC output rails to prevent damage to USB controller ICs and load switches during fault conditions. Use Value: Responds in <1 ns to clamp 10/1000 μs surges - protects 5 V/9 V/15 V output stages without affecting normal regulation loop dynamics. |
Use Scenario: Protecting microcontroller GPIOs and LIN slave nodes in door module, lighting, or HVAC control units subject to battery reverse connection and jump-start pulses. IC Role / Device Role / Timing Role: Bidirectional TVS integrated into ECU input filter network to handle both positive and negative transients without polarity constraints. Use Value: AEC-Q101 qualification ensures compliance with automotive longevity requirements - supports 15-year service life under thermal cycling and humidity exposure. |
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 | VC = 29.2 V at 20.5 A; same VWM/VBR but higher clamping voltage; non-AEC-Q101 rated | Limited to industrial/commercial use; not approved for automotive ECUs or safety-critical modules | Select when AEC-Q101 is not required and board space allows same SMB package; verify clamping margin with downstream IC VDS(max). |
| SMCJ18CA | Higher PPPM = 1500 W; larger SMC (DO-214AB) package; VC = 29.2 V at 51.0 A | Used where higher surge energy (e.g., ISO 16750-2 pulse 5b) must be absorbed; requires larger PCB footprint | Choose for heavy-duty industrial motor drives or EV charging station interfaces needing >1 kW surge rating; not drop-in compatible due to package size. |
Compared with SMBG18CAHE3/52, SMBJ18CA offers identical voltage ratings but lacks automotive qualification and has looser clamping, while SMCJ18CA provides greater surge capacity at the cost of larger footprint and non-interchangeable packaging - making SMBG18CAHE3/52 optimal for space-constrained AEC-Q101-compliant designs.
Availability
SMBG18CAHE3/52 is available at Aetrix Electronics and suitable for automotive sensor protection, industrial I/O interface hardening, and consumer power adapter input stage protection requiring stable component supply and full traceability.
Supply support for SMBG18CAHE3/52 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, rectifiers, TVS devices, and power MOSFETs with emphasis on reliability, efficiency, and application-specific optimization.
The SMBG series was engineered for high-reliability surface-mount transient suppression in automotive and industrial systems - prioritizing low clamping ratio, AEC-Q101 compliance, and compatibility with automated SMT assembly processes.
FAQ
What is the standoff voltage (VWM) of SMBG18CAHE3/52?
The standoff voltage of SMBG18CAHE3/52 is 18 V - the maximum DC or continuous reverse operating voltage at which the device remains in high-impedance state with leakage <1.0 μA. This value defines the upper limit of normal operating voltage on protected lines before clamping initiates, ensuring compatibility with standard 12 V automotive and 24 V industrial systems. SMBG18CAHE3/52 maintains this specification across its full operating temperature range of -55 °C to +150 °C.
Is SMBG18CAHE3/52 unidirectional or bidirectional?
SMBG18CAHE3/52 is a bidirectional transient voltage suppressor, indicated by the "CA" suffix. It provides symmetrical clamping in both polarities - meaning either terminal can serve as anode or cathode depending on transient direction. Unlike unidirectional variants (e.g., SMBG18A), SMBG18CAHE3/52 has no polarity marking and is used where AC signals, differential buses, or undefined polarity transients require protection without orientation constraints.
Does SMBG18CAHE3/52 meet AEC-Q101 qualification?
Yes, SMBG18CAHE3/52 is explicitly AEC-Q101 qualified, as confirmed by Vishay's ordering information and mechanical data section specifying "HE3" suffix for AEC-Q101 qualification. This certification covers stress tests including temperature cycling, high-temperature reverse bias (HTRB), and accelerated life testing - validating its suitability for automotive applications such as body control modules, ADAS sensors, and infotainment power supplies.
What is the maximum clamping voltage (VC) for SMBG18CAHE3/52?
The maximum clamping voltage (VC) of SMBG18CAHE3/52 is 27.6 V at a peak pulse current (IPPM) of 21.7 A under the standard 10/1000 μs waveform. This value represents the highest voltage that will appear across the device during a worst-case surge event - directly determining the overvoltage stress imposed on downstream components like microcontrollers, transceivers, or MOSFETs. SMBG18CAHE3/52 achieves a clamping ratio (VC/VBR) of approximately 1.25, indicating efficient energy diversion.
What package type does SMBG18CAHE3/52 use?
SMBG18CAHE3/52 uses the SMBG package, also known as DO-215AA - a surface-mount, low-profile variant of the SMB family measuring 5.97 mm × 4.06 mm with a height of 2.16 mm. It features matte tin-plated leads compliant with J-STD-002 and JESD 22-B102, and is rated MSL Level 1 for lead-free reflow up to 260 °C. The SMBG footprint enables high-density layouts while maintaining thermal performance via recommended 5.0 mm × 5.0 mm copper pads per terminal.
SMBG18CAHE3/52 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-215AA, SMB Gull Wing
- 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):
- 20.5A
- Power - Peak Pulse:
- 600W
- 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 (SMBG)
SMBG18CAHE3/52 FAQ
1.How can I place an order for SMBG18CAHE3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBG18CAHE3/52 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 SMBG18CAHE3/52 reliable?
The price and inventory of SMBG18CAHE3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBG18CAHE3/52 is usually 5 days.
3.What payment methods are accepted for SMBG18CAHE3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBG18CAHE3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBG18CAHE3/52?
SMBG18CAHE3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBG18CAHE3/52 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 SMBG18CAHE3/52?
For technical support, including SMBG18CAHE3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBG18CAHE3/52 requirements.
6.How does Aetrix verify that SMBG18CAHE3/52 is sourced from the original manufacturer or authorized distributors?
All SMBG18CAHE3/52 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 SMBG18CAHE3/52 meets industry standards.
7.What is the process for return or replacement of SMBG18CAHE3/52?
All SMBG18CAHE3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBG18CAHE3/52, 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 SMBG18CAHE3/52 part is unused and in its original packaging.
Return procedure for SMBG18CAHE3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBG18CAHE3/52 Tags
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