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Vishay General Semiconductor - Diodes Division SMBG18CHE3/5B
- Part No.:
- SMBG18CHE3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AA, SMB Gull Wing
- Datasheet:
-
SMBG18CHE3/5B.pdf
- Description:
- TVS DIODE 18VWM 32.2VC DO215AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,103
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Product details
Overview
SMBG18CHE3/5B from Vishay General Semiconductor is a bi-directional transient voltage suppressor (TVS) diode in DO-215AA (SMBG) package, designed for clamping voltage transients on signal or power lines. It features 18 V stand-off voltage (VWM), 20.0–22.1 V breakdown voltage (VBR), 600 W peak pulse power (10/1000 μs), <1.0 μA reverse leakage at VWM, and clamps to ≤29.2 V at 21.7 A peak surge current - deployed in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the SMBG18CHE3/5B datasheet, SMBG18CHE3/5B pinout, SMBG18CHE3/5B application, or SMBG18CHE3/5B equivalent, key selection criteria include bi-directional clamping capability, AEC-Q101 qualification, 150 °C junction temperature rating, low incremental surge resistance, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This bi-directional TVS operates symmetrically in both polarities, with identical VBR min/max (20.0 V / 22.1 V), VC = 29.2 V at IPPM = 21.7 A, and thermal resistance RθJA = 100 °C/W. Its glass-passivated junction ensures stable avalanche behavior under repetitive 10/1000 μs surges at 0.01% duty cycle.
The device meets MSL Level 1 per J-STD-020 (peak reflow 260 °C), uses matte tin-plated leads compliant with J-STD-002 and JESD 22-B102, and carries HE3 suffix indicating AEC-Q101 qualification and JESD 201 Class 2 whisker resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - maximum continuous reverse operating voltage before clamping initiates |
| VBR (min/max) | 20.0 V / 22.1 V at IT = 1 mA - defines reliable avalanche onset window for bidirectional protection |
| VC @ IPPM | 29.2 V at 21.7 A - clamped voltage during 10/1000 μs surge, limiting stress on downstream ICs |
| PPPM | 600 W - peak pulse power handling per single 10/1000 μs transient, derated above 25 °C |
| ID @ VWM | <1.0 μA - ultra-low leakage preserves signal integrity in high-impedance sensor or data lines |
| TJ max | +150 °C - enables operation in under-hood automotive and industrial environments |
| Package | DO-215AA (SMBG) - surface-mount outline with 0.235"–0.255" body length, optimized for automated placement |
Pinout & Package
DO-215AA (SMBG) package: gull-wing surface-mount outline with two terminals; bi-directional construction means no polarity marking - both terminals are functionally identical and interchangeable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Bi-directional avalanche junction - conducts surge current equally in either direction when |V| > VBR |
| Case / Body | Thermal and mechanical interface | Plastic molding meets UL 94 V-0; mounted on 5.0 mm × 5.0 mm copper pads for optimal thermal dissipation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, ADAS sensors, and infotainment power rails |
| 600 W peak pulse power (10/1000 μs) | Withstands IEC 61000-4-5 Level 4 surges (4 kV line-earth, 2 kV line-line) without degradation |
| Glass passivated junction | Ensures consistent VBR tolerance and long-term stability under thermal cycling and humidity exposure |
| MSL Level 1, 260 °C peak reflow | Compatible with standard lead-free SMT reflow profiles without preconditioning or special handling |
| Low clamping ratio (VC/VBR ≈ 1.39) | Minimizes overvoltage overshoot during fast transients, protecting 3.3 V and 5 V logic interfaces |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) from load dump and ESD events in vehicle ECUs. IC Role / Device Role / Timing Role: Bi-directional clamping element placed directly at connector entry point to shunt transients before reaching PHY layer. Use Value: Limits induced voltage to ≤29.2 V during 10/1000 μs surges, preserving signal fidelity and preventing latch-up in 5 V tolerant receivers. |
Use Scenario: Safeguarding digital input modules in programmable logic controllers against field-wiring transients and relay coil flyback. IC Role / Device Role / Timing Role: Primary surge suppression device across 24 V DC input terminals, coordinated with upstream fuse and filtering. Use Value: Withstands repeated 600 W pulses with <1.0 μA leakage, ensuring long-term reliability in unattended factory automation systems. |
| Telecom Line Interface | Consumer Power Adapter Output |
Use Scenario: Transient suppression on Ethernet PHY magnetics secondary side and RS-485 differential pairs in base station equipment. IC Role / Device Role / Timing Role: Fast-response bi-directional clamp parallel to data lines, minimizing capacitance impact on signal rise time. Use Value: Junction capacitance <100 pF at zero bias enables use on 100 Mbps Ethernet links without signal integrity loss. |
Use Scenario: Secondary-side overvoltage protection on 5 V/9 V/12 V USB-C and legacy wall adapter outputs. IC Role / Device Role / Timing Role: Final-stage clamp after DC-DC regulation, absorbing residual switching spikes and external surges. Use Value: 18 V VWM aligns with 12 V nominal output with 50% margin, while 29.2 V clamping prevents damage to connected devices. |
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 | Same VWM (18 V), but lower PPPM (600 W vs. SMBJ's 600 W), identical DO-214AA (SMB) package - slightly larger footprint than DO-215AA | Less stringent board space constraints; suitable where existing SMB layout exists | Select SMBJ18CA only if DO-214AA footprint is already standardized and thermal pad area exceeds 5.0 mm × 5.0 mm |
| SMCJ18CA | Higher PPPM (1500 W), same VWM, but larger DO-214AB (SMC) package - 2.5× footprint and higher RθJA (50 °C/W) | Required for higher-energy surge environments (e.g., AC mains input stages) | Choose SMCJ18CA when system-level testing requires >1000 W surge immunity and PCB real estate permits larger package |
Compared with SMBJ18CA and SMCJ18CA, SMBG18CHE3/5B delivers identical clamping performance in the smallest possible footprint (DO-215AA), optimized for space-constrained automotive and portable electronics - with AEC-Q101 qualification not shared by standard SMBJ variants.
Availability
SMBG18CHE3/5B is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, telecom line protection, and consumer power adapter outputs requiring stable component supply and full traceability.
Supply support for SMBG18CHE3/5B 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 and automotive-grade qualification.
The SMBG series targets high-reliability transient suppression in space-constrained, thermally demanding applications - engineered specifically for AEC-Q101 compliance and automated SMT assembly in automotive and industrial end-equipment.
FAQ
What is the polarity configuration of SMBG18CHE3/5B?
SMBG18CHE3/5B is a bi-directional TVS diode with symmetrical avalanche characteristics in both directions. It has no cathode band marking and functions identically regardless of terminal orientation - making it ideal for AC-coupled or differential signal lines where polarity is undefined or reversible.
Is SMBG18CHE3/5B qualified for automotive use?
Yes, SMBG18CHE3/5B carries the HE3 suffix, confirming full AEC-Q101 qualification per Vishay's documentation. This includes stress testing for temperature cycling, humidity, mechanical shock, and surge robustness - enabling use in engine control units, ADAS camera modules, and body electronics.
What is the maximum clamping voltage for SMBG18CHE3/5B under surge conditions?
The maximum clamping voltage (VC) for SMBG18CHE3/5B is 29.2 V at a peak pulse current (IPPM) of 21.7 A, measured with a 10/1000 μs waveform. This value is guaranteed across the full operating temperature range and defines the upper voltage limit imposed on protected circuitry during transient events.
How does the DO-215AA (SMBG) package differ from DO-214AA (SMB)?
DO-215AA (SMBG) is dimensionally smaller than DO-214AA (SMB), with tighter terminal spacing and reduced body height - enabling higher board density. Both share gull-wing leads, but SMBG's optimized thermal pad layout (0.235" × 0.255") delivers equivalent thermal performance in less area, verified per Vishay's recommended 5.0 mm × 5.0 mm copper pads.
Does SMBG18CHE3/5B require derating at elevated ambient temperatures?
Yes, SMBG18CHE3/5B must be derated above TA = 25 °C per Figure 2 in Vishay document 88456. At 85 °C ambient, its peak pulse power drops to ~420 W (70% of 600 W), and at 125 °C, it falls to ~240 W (40%). Designers must apply this derating when sizing for under-hood or enclosed industrial environments.
SMBG18CHE3/5B 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:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 18V
- Voltage - Breakdown (Min):
- 20V
- Voltage - Clamping (Max) @ Ipp:
- 32.2V
- Current - Peak Pulse (10/1000µs):
- 18.6A
- 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)
SMBG18CHE3/5B FAQ
1.How can I place an order for SMBG18CHE3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBG18CHE3/5B 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 SMBG18CHE3/5B reliable?
The price and inventory of SMBG18CHE3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBG18CHE3/5B is usually 5 days.
3.What payment methods are accepted for SMBG18CHE3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBG18CHE3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBG18CHE3/5B?
SMBG18CHE3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBG18CHE3/5B 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 SMBG18CHE3/5B?
For technical support, including SMBG18CHE3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBG18CHE3/5B requirements.
6.How does Aetrix verify that SMBG18CHE3/5B is sourced from the original manufacturer or authorized distributors?
All SMBG18CHE3/5B 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 SMBG18CHE3/5B meets industry standards.
7.What is the process for return or replacement of SMBG18CHE3/5B?
All SMBG18CHE3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBG18CHE3/5B, 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 SMBG18CHE3/5B part is unused and in its original packaging.
Return procedure for SMBG18CHE3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBG18CHE3/5B Tags
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