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Vishay General Semiconductor - Diodes Division SMBG18AHE3/52
- Part No.:
- SMBG18AHE3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AA, SMB Gull Wing
- Datasheet:
-
SMBG18AHE3/52.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO215AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,813
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Product details
Overview
SMBG18AHE3/52 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 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), <1.0 µA reverse leakage at VWM, and clamps to ≤29.2 V at 20.5 A peak pulse current - deployed in automotive power line and sensor interface protection.
For engineers reviewing the SMBG18AHE3/52 datasheet, SMBG18AHE3/52 pinout, SMBG18AHE3/52 application, or SMBG18AHE3/52 equivalent, key selection criteria include its AEC-Q101 qualification, unidirectional polarity with cathode band marking, 150 °C max junction temperature, low thermal resistance (RθJL = 20 °C/W), and compliance with UL 497B for telecom and industrial surge protection.
Technical Context
This TVS diode operates as a clamping device in parallel with protected circuitry, responding to fast transients (sub-nanosecond response time) by avalanche breakdown when reverse voltage exceeds VBR. Its glass-passivated junction ensures stable leakage and long-term reliability under repetitive surge stress.
Rated for 600 W peak pulse power (10/1000 µs waveform, 0.01% duty cycle), it handles up to 100 A non-repetitive forward surge (8.3 ms half-sine) and maintains clamping performance across -55 °C to +150 °C operating range - validated per JESD22-B102 and J-STD-020 MSL Level 1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - maximum continuous reverse operating voltage before clamping begins |
| VBR (min/max) | 20.0 V / 22.1 V at 1 mA - guaranteed avalanche initiation window for predictable turn-on |
| VC @ IPPM | ≤29.2 V at 20.5 A - clamped voltage during 600 W transient, limiting stress on downstream ICs |
| ID @ VWM | <1.0 µA - negligible standby power loss and signal integrity impact in high-impedance circuits |
| PPPM | 600 W - surge energy handling capability compliant with IEC 61000-4-5 Level 4 (industrial) |
| TJ max | +150 °C - enables use in under-hood automotive environments without derating |
| Package | SMBG (DO-215AA) - surface-mount footprint compatible with automated assembly and 0.2" × 0.2" copper pad layout |
Pinout & Package
SMBG18AHE3/52 uses the SMBG (DO-215AA) package: a low-profile, molded surface-mount case with matte tin-plated leads solderable per J-STD-002. Polarity is marked by a cathode band; terminal 1 is cathode, terminal 2 is anode.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink node | Connects to protected line; conducts avalanche current to ground during overvoltage events |
| Anode | Reference/ground return path | Typically tied to system ground plane; completes clamping loop with minimal inductance |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and ADAS sensor interfaces |
| 600 W peak pulse power (10/1000 µs) | Withstands repeated ISO 7637-2 Pulse 1/2a/5a surges without degradation |
| Low incremental surge resistance | Ensures tight VC tolerance and consistent clamping across production lots |
| MSL Level 1 (260 °C peak reflow) | Compatible with standard lead-free SMT reflow profiles without moisture sensitivity concerns |
| Glass passivated junction | Provides stable VBR and low leakage over temperature and lifetime |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs against load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp spikes above 29.2 V. Use Value: Prevents latch-up or permanent damage to microcontrollers and CAN transceivers during ISO 16750-2 tests. | Use Scenario: Shielding analog outputs of pressure/temperature sensors from ESD and switching noise. IC Role / Device Role / Timing Role: Low-capacitance TVS on 4–20 mA or 0–5 V signal lines to absorb ±8 kV contact ESD per IEC 61000-4-2. Use Value: Maintains signal fidelity with <1.0 µA leakage and avoids false triggering in precision measurement circuits. |
| Telecom Line Interface Protection | Consumer Power Adapter Input Protection |
Use Scenario: Safeguarding Ethernet PHYs and DSL line drivers from lightning-induced surges. IC Role / Device Role / Timing Role: Primary-level TVS on RJ-45 transformer center taps or DC bias lines. Use Value: UL 497B recognition confirms suitability for telecom infrastructure with certified surge withstand. | Use Scenario: Input-stage protection for AC-DC adapters against mains-borne transients. IC Role / Device Role / Timing Role: Secondary-side TVS on +5 V/+12 V rails downstream of rectification. Use Value: Enables compact design with SMBG footprint while meeting IEC 61000-4-5 Level 3 immunity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18A-E3/52 | Same VWM/VBR/PPPM, but SMB (DO-214AA) package - 1.58 mm height vs. SMBG's 1.14 mm | Less suitable for ultra-low-profile designs; higher RθJA (110 °C/W vs. 100 °C/W) | Select SMBG18AHE3/52 when board height is constrained or AEC-Q101 qualification is mandatory. |
| 1.5SMC18A | Same electrical specs, but larger SMC (DO-214AB) package - 2.62 mm height, higher IFSM (200 A) | Better for high-energy surge zones (e.g., front-end power entry); not AEC-Q101 qualified | Choose SMBG18AHE3/52 for space-constrained automotive modules where qualification and profile are critical. |
Compared with SMBJ18A-E3/52 and 1.5SMC18A, SMBG18AHE3/52 delivers identical clamping performance in a lower-profile, automotive-qualified package - enabling tighter PCB stacking and certified deployment in safety-critical vehicle subsystems without layout redesign.
Availability
SMBG18AHE3/52 is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor systems, and telecom infrastructure requiring stable component supply, AEC-Q101 compliance, and repeatable surge protection performance.
Supply support for SMBG18AHE3/52 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific validation.
The SMBG series was engineered for high-reliability surface-mount transient suppression in space-constrained, thermally demanding environments - particularly targeting automotive, industrial, and telecom applications requiring AEC-Q101 or UL recognition.
FAQ
What is the clamping voltage of SMBG18AHE3/52 and how is it measured?
The SMBG18AHE3/52 has a maximum clamping voltage (VC) of 29.2 V at 20.5 A peak pulse current (IPPM), tested with a 10/1000 µs waveform per IEC 61000-4-5. This value represents the upper limit of voltage seen by protected circuitry during a standardized surge event, ensuring downstream components remain within safe operating limits. The SMBG18AHE3/52 achieves this via controlled avalanche breakdown in its glass-passivated silicon junction.
Is SMBG18AHE3/52 suitable for automotive applications?
Yes, SMBG18AHE3/52 is AEC-Q101 qualified and rated for operation from -55 °C to +150 °C, making it suitable for under-hood and body-control module applications. Its 600 W peak pulse power rating and low clamping voltage support compliance with ISO 7637-2 and ISO 16750-2 transient immunity standards. The SMBG18AHE3/52 also meets JESD22-B102 whisker testing and J-STD-020 MSL Level 1 reflow requirements.
What does the "HE3" suffix indicate in SMBG18AHE3/52?
The "HE3" suffix in SMBG18AHE3/52 denotes RoHS-compliant, AEC-Q101-qualified construction with matte tin-plated leads. Per Vishay's ordering nomenclature, "H" indicates AEC-Q101 qualification, "E3" specifies RoHS-compliant industrial-grade molding compound, and "/52" refers to 750-unit 7-inch tape-and-reel packaging. This distinguishes it from non-automotive variants like SMBG18A-E3/52.
How does SMBG18AHE3/52 differ from bidirectional TVS diodes like SMBG18CA?
SMBG18AHE3/52 is unidirectional and features a cathode band for polarity identification, while SMBG18CA is bidirectional with no polarity marking and symmetrical breakdown in both directions. The SMBG18AHE3/52 offers lower leakage (<1.0 µA at 18 V) and is optimized for DC power line protection; SMBG18CA suits AC signal lines or differential buses where polarity reversal occurs. Their VBR ranges overlap but are tested under different conditions per datasheet tables.
What is the thermal resistance profile of SMBG18AHE3/52 and why does it matter?
SMBG18AHE3/52 has a typical junction-to-lead thermal resistance (RθJL) of 20 °C/W and junction-to-ambient (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" copper pads. This low RθJL enables efficient heat transfer to the PCB during surge events, preventing thermal runaway and ensuring reliable 600 W pulse handling. For high-repetition-rate transients, minimizing RθJA through proper pad layout directly extends device lifetime - a key design consideration for the SMBG18AHE3/52 in automotive ECUs.
SMBG18AHE3/52 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:
- 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)
SMBG18AHE3/52 FAQ
1.How can I place an order for SMBG18AHE3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBG18AHE3/52 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 SMBG18AHE3/52 reliable?
The price and inventory of SMBG18AHE3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBG18AHE3/52 is usually 5 days.
3.What payment methods are accepted for SMBG18AHE3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBG18AHE3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBG18AHE3/52?
SMBG18AHE3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBG18AHE3/52 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 SMBG18AHE3/52?
For technical support, including SMBG18AHE3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBG18AHE3/52 requirements.
6.How does Aetrix verify that SMBG18AHE3/52 is sourced from the original manufacturer or authorized distributors?
All SMBG18AHE3/52 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 SMBG18AHE3/52 meets industry standards.
7.What is the process for return or replacement of SMBG18AHE3/52?
All SMBG18AHE3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBG18AHE3/52, 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 SMBG18AHE3/52 part is unused and in its original packaging.
Return procedure for SMBG18AHE3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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