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Vishay General Semiconductor - Diodes Division SMBG18AHE3/5B
- Part No.:
- SMBG18AHE3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AA, SMB Gull Wing
- Datasheet:
-
SMBG18AHE3/5B.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO215AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,992
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Product details
Overview
SMBG18AHE3/5B from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMBG (DO-215AA) package, designed for robust overvoltage protection of sensitive electronics. It features 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), 29.2 V clamping voltage (VC) at 20.5 A, and AEC-Q101 qualification for automotive-grade reliability.
For engineers reviewing the SMBG18AHE3/5B datasheet, SMBG18AHE3/5B pinout, SMBG18AHE3/5B application, or SMBG18AHE3/5B equivalent, key selection criteria include clamping performance under 10/1000 µs surge, unidirectional polarity with cathode band marking, thermal resistance (RθJA = 100 °C/W), and compliance with UL 497B and JESD201 Class 2 whisker testing.
Technical Context
This TVS diode operates as a fast-acting shunt clamp, diverting transient energy to ground when reverse voltage exceeds VBR. Its glass-passivated junction ensures stable leakage (<1.0 µA at VWM) and low incremental surge resistance, enabling precise clamping within 1 ns response time. The device sustains repetitive surges at 0.01% duty cycle and handles 100 A non-repetitive forward surge (8.3 ms half-sine).
Designed for surface-mount automated placement, SMBG18AHE3/5B uses matte tin-plated leads solderable per J-STD-002 and JESD22-B102, with MSL Level 1 rating (peak reflow 260 °C). Its DO-215AA footprint supports high-density PCB layouts while maintaining thermal dissipation via 5.0 mm × 5.0 mm copper pads per terminal.
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 1 mA - Ensures reliable turn-on margin above VWM with tight tolerance |
| VC @ IPPM | 29.2 V at 20.5 A - Limits protected circuit voltage during 600 W transient events |
| PPPM | 600 W (10/1000 µs) - Withstands industry-standard lightning/surge waveforms without degradation |
| IFSM | 100 A (8.3 ms half-sine) - Handles high-energy inductive switch-off surges in power circuits |
| TJ range | −55 °C to +150 °C - Supports operation in under-hood automotive and industrial environments |
| AEC-Q101 | Qualified - Validated for automotive electronic control units requiring long-term reliability |
Pinout & Package
Package: SMBG (DO-215AA), surface-mount, low-profile case with molded UL 94 V-0 compound; cathode indicated by band on body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry (unidirectional) | Connected to protected line; conducts only during forward surge or ESD event |
| Cathode | Clamping reference node | Marked with band; ties to system ground to shunt transients away from ICs/MOSFETs |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power | Enables protection against IEC 61000-4-5 Level 4 surges (4 kV line-to-line) without derating |
| Glass passivated junction | Guarantees stable VBR and low leakage across temperature and lifetime stress |
| AEC-Q101 qualification | Validates suitability for automotive powertrain, body control, and ADAS modules |
| MSL Level 1 rating | Allows single-reflow assembly without moisture sensitivity concerns |
| UL 497B recognition | Meets safety requirements for telecom and industrial signal line protectors |
Applications
| Automotive Power Supply Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional shunt clamp placed between power rail and chassis ground. Use Value: Clamps to 29.2 V during 20.5 A surge, preventing damage to downstream 3.3 V/5 V regulators and microcontrollers. | Use Scenario: Safeguarding analog sensor outputs (e.g., pressure, temperature) in factory automation systems. IC Role / Device Role / Timing Role: Line-side TVS on 4–20 mA or 0–10 V signal paths exposed to EMI and cable coupling. Use Value: Sub-1 ns response limits voltage overshoot to <30 V, preserving ADC input integrity and avoiding latch-up. |
| Telecom Line Card Surge Suppression | Consumer Power Adapter Input Protection |
Use Scenario: Front-end protection of Ethernet PHY interfaces and DSL line drivers. IC Role / Device Role / Timing Role: Primary surge suppression stage before gas discharge tube or secondary TVS. Use Value: 600 W rating absorbs induced lightning surges per ITU-T K.21 Basic Level, reducing secondary protector stress. | Use Scenario: Input-stage transient protection in AC-DC adapters for smart home devices. IC Role / Device Role / Timing Role: Clamp on primary-side DC bus after bridge rectifier, before bulk capacitor. Use Value: Withstands repeated 100 A inductive spikes from relay switching, extending adapter MTBF. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18A-E3/52 | Same VWM/VBR/VC, but SMB (DO-214AA) package; RθJA = 110 °C/W vs. 100 °C/W | Lower power density; less suitable for high-ambient automotive under-hood use | Select SMBG18AHE3/5B when thermal performance or AEC-Q101 validation is required. |
| 1.5SMC18A | Same electrical specs, but larger SMC (DO-214AB) package; higher IPPM (22.2 A) and PPPM (1500 W) | Over-spec'd for 600 W needs; occupies 3× PCB area vs. SMBG | Choose SMBG18AHE3/5B for space-constrained designs where 600 W suffices and AEC-Q101 is mandatory. |
Compared with SMBJ18A-E3/52 and 1.5SMC18A, SMBG18AHE3/5B delivers optimized thermal resistance and automotive qualification in the smallest footprint among these 18 V unidirectional TVS options-critical for modern ECU miniaturization and functional safety compliance.
Availability
SMBG18AHE3/5B is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor systems, and telecom infrastructure requiring stable component supply with AEC-Q101 assurance and consistent tape-and-reel delivery.
Supply support for SMBG18AHE3/5B 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 application-specific performance.
The SMBG series was developed to deliver high-power transient suppression in ultra-compact surface-mount packages for automotive and industrial applications demanding AEC-Q101 validation and robust surge handling.
FAQ
What is the clamping voltage of SMBG18AHE3/5B and how is it measured?
The SMBG18AHE3/5B has a maximum clamping voltage (VC) of 29.2 V, measured at its peak pulse current (IPPM) of 20.5 A using a standardized 10/1000 µs double-exponential surge waveform. This value reflects the actual voltage seen by protected circuitry during worst-case transient events and is guaranteed across the full operating temperature range.
Is SMBG18AHE3/5B suitable for automotive applications?
Yes, SMBG18AHE3/5B is AEC-Q101 qualified and rated for −55 °C to +150 °C junction temperature, making it suitable for under-hood and cabin-mounted automotive electronics including engine control units, body controllers, and ADAS sensors. Its RoHS-compliant HE3 suffix confirms automotive-grade material compliance.
What does the "HE3/5B" suffix indicate in SMBG18AHE3/5B?
The "HE3" suffix denotes RoHS-compliant, AEC-Q101-qualified construction with matte tin-plated leads; "5B" specifies packaging in 13-inch diameter plastic tape and reel with 3200 units per reel-optimized for high-volume SMT assembly lines requiring extended reel life and traceability.
How does SMBG18AHE3/5B compare to bidirectional TVS diodes like SMBG18CA?
SMBG18AHE3/5B is unidirectional and intended for DC line protection with polarity-sensitive placement (cathode to ground); SMBG18CA is bidirectional and used for AC or differential signal lines. They share identical VWM, VBR, and VC ratings but differ in polarity marking, leakage behavior, and application scope-SMBG18AHE3/5B is not interchangeable with SMBG18CA without circuit redesign.
What is the thermal resistance of SMBG18AHE3/5B and why does it matter?
SMBG18AHE3/5B has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 5.0 mm × 5.0 mm copper pads. This value directly impacts safe operating area during repetitive surges: lower RθJA allows higher average power dissipation and improves reliability in high-temperature environments such as automotive power modules.
SMBG18AHE3/5B 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:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- 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)
SMBG18AHE3/5B FAQ
1.How can I place an order for SMBG18AHE3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBG18AHE3/5B 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 SMBG18AHE3/5B reliable?
The price and inventory of SMBG18AHE3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBG18AHE3/5B is usually 5 days.
3.What payment methods are accepted for SMBG18AHE3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBG18AHE3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBG18AHE3/5B?
SMBG18AHE3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBG18AHE3/5B 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 SMBG18AHE3/5B?
For technical support, including SMBG18AHE3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBG18AHE3/5B requirements.
6.How does Aetrix verify that SMBG18AHE3/5B is sourced from the original manufacturer or authorized distributors?
All SMBG18AHE3/5B 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 SMBG18AHE3/5B meets industry standards.
7.What is the process for return or replacement of SMBG18AHE3/5B?
All SMBG18AHE3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBG18AHE3/5B, 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 SMBG18AHE3/5B part is unused and in its original packaging.
Return procedure for SMBG18AHE3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBG18AHE3/5B Tags
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