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Vishay General Semiconductor - Diodes Division SMBJ18HE3/52
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- Part No.:
- SMBJ18HE3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ18HE3/52.pdf
- Description:
- TVS DIODE 18VWM 32.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,413
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Product details
Overview
SMBJ18HE3/52 from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) 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, 29.2 V maximum clamping voltage (VC) at 20.5 A peak pulse current (IPPM), and 600 W peak pulse power (PPPM) with 10/1000 µs waveform - deployed on power rails and signal lines in automotive ECUs and industrial I/O modules.
For engineers reviewing the SMBJ18HE3/52 datasheet, SMBJ18HE3/52 pinout, SMBJ18HE3/52 application, or SMBJ18HE3/52 equivalent, key selection criteria include clamping performance under 20.5 A surge, AEC-Q101 qualification status, thermal resistance (RθJA = 100 °C/W), unidirectional polarity marking, and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This TVS diode operates as a fast-acting shunt protector: when reverse voltage exceeds VBR (20.0–22.1 V), it avalanches to clamp transients below VC = 29.2 V. Its glass-passivated junction ensures stable leakage (<1.0 µA at VWM) and low incremental surge resistance, enabling sub-nanosecond response to ESD and lightning-induced surges.
Designed for automotive-grade reliability, SMBJ18HE3/52 meets AEC-Q101 qualification, supports 150 °C max junction temperature, and is rated for repetitive 0.01% duty cycle pulses. The cathode band identifies polarity; terminals are matte tin-plated per J-STD-002 and JESD 22-B102, with MSL Level 1 moisture sensitivity.
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 - guaranteed avalanche onset range for reliable turn-on margin |
| VC @ IPPM | 29.2 V at 20.5 A - clamped voltage during 10/1000 µs transient, limiting stress on downstream ICs |
| PPPM | 600 W - peak transient energy absorption capability without failure under standardized surge waveform |
| ID @ VWM | ≤1.0 µA - ultra-low reverse leakage preserves system power integrity in standby modes |
| TJ max. | +150 °C - enables deployment in under-hood automotive environments and high-temperature industrial enclosures |
| RθJA | 100 °C/W - thermal resistance from junction to ambient on standard 0.2" × 0.2" copper pads |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, low-profile case with molded UL 94 V-0 compound; cathode identified by black band on one end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal (cathode-banded side is opposite) | Connected to protected circuit ground or low-side return path; defines unidirectional current flow direction |
| Cathode | Reverse-biased terminal (marked with band) | Connected to line being protected (e.g., 12 V rail); avalanche occurs when voltage exceeds VBR relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and ADAS sensor interfaces |
| 600 W peak pulse power | Withstands IEC 61000-4-5 Level 4 (4 kV) surges on 50 Ω source impedance without degradation |
| Glass-passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity exposure |
| MSL Level 1 | Zero floor life limitation - can be mounted directly after unpacking without baking |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes voltage overshoot during transients, reducing risk of latch-up or gate oxide damage in MOSFETs/ICs |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: 12 V battery-supplied microcontroller power input in vehicle door module exposed to load-dump transients up to 35 V. IC Role / Device Role / Timing Role: Shunt TVS device placed between VCC and GND to clamp surges before they reach LDO regulator and MCU. Use Value: Limits voltage to ≤29.2 V during 20.5 A transient, preventing brownout reset or permanent damage to 3.3 V logic supply chain. |
Use Scenario: Analog output line (4–20 mA) from pressure sensor in factory automation PLC subjected to ESD events during field wiring. IC Role / Device Role / Timing Role: Unidirectional TVS connected across signal and return to suppress ±8 kV contact discharge per IEC 61000-4-2. Use Value: Sub-ns response clamps transients before op-amp input stage saturates, preserving measurement accuracy and avoiding ADC saturation. |
| Telecom DC Power Input | Consumer USB Port ESD Protection |
|
Use Scenario: -48 V DC input stage of telecom base station remote radio unit experiencing lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Primary front-end TVS on power entry PCB, coordinated with upstream fuse and downstream filter capacitors. Use Value: Absorbs 600 W surge energy while maintaining clamping below -55 V, protecting PoE controller and isolation transformers. |
Use Scenario: VBUS line of USB 2.0 port on smart speaker exposed to user-handling ESD during plug insertion. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VBUS and GND, upstream of USB switch and power delivery IC. Use Value: Clamps ±15 kV air discharge to <30 V within 1 ns, preventing latch-up in USB PHY and preserving enumeration sequence. |
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 | Commercial-grade (non-AEC-Q101), same VWM/VBR/VC specs, identical SMB package and pinout | Lacks automotive qualification; suitable for consumer/industrial designs without AEC compliance requirements | Select when cost sensitivity outweighs automotive qualification needs and environmental stress testing is not mandated |
| SMAJ18AHE3/A | Lower PPPM (400 W vs. 600 W), SMA (DO-214AC) package - smaller footprint but higher RθJA (140 °C/W) | Reduced surge handling margin; requires tighter thermal layout due to lower power rating and worse thermal resistance | Choose only if board space is constrained and worst-case surge energy remains ≤400 W; verify thermal derating at 125 °C ambient |
Compared with SMBJ18A-E3/52, SMBJ18HE3/52 adds AEC-Q101 qualification for automotive use without sacrificing electrical specs; versus SMAJ18AHE3/A, it delivers +50% surge power headroom and superior thermal performance in the same production-ready SMB footprint.
Availability
SMBJ18HE3/52 is available at Aetrix Electronics and suitable for automotive electronic control units, industrial programmable logic controllers, and telecom power supply designs requiring stable component supply with full AEC-Q101 traceability and RoHS compliance.
Supply support for SMBJ18HE3/52 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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMBJ series targets high-energy transient suppression in harsh environments - engineered for automotive, industrial, and telecom systems where robustness against load dump, ESD, and lightning surges is mission-critical.
FAQ
What is the clamping voltage of SMBJ18HE3/52 under a 10/1000 µs surge?
The SMBJ18HE3/52 has a maximum clamping voltage (VC) of 29.2 V when subjected to its rated peak pulse current of 20.5 A using the 10/1000 µs waveform. This value is measured per JEDEC standards and guarantees that downstream components see no more than 29.2 V during such transients, making SMBJ18HE3/52 suitable for protecting 24 V nominal systems with safety margins.
Is SMBJ18HE3/52 qualified for automotive applications?
Yes, SMBJ18HE3/52 is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HE3", which denotes RoHS-compliant and AEC-Q101 qualified variants. This qualification covers temperature cycling, humidity testing, mechanical shock, and surge endurance - validating SMBJ18HE3/52 for use in engine compartments, body control modules, and ADAS sensors.
What does the "HE3" suffix mean in SMBJ18HE3/52?
The "HE3" suffix in SMBJ18HE3/52 indicates a RoHS-compliant, AEC-Q101 qualified version with matte tin-plated leads meeting J-STD-002 solderability and JESD 22-B102 whisker resistance Class 2. It distinguishes this variant from commercial-grade "E3" parts and halogen-free "HM3" versions, ensuring full automotive supply chain traceability and reliability assurance for SMBJ18HE3/52.
Can SMBJ18HE3/52 replace SMBJ18A-E3/52 in an existing design?
Yes, SMBJ18HE3/52 is a direct drop-in replacement for SMBJ18A-E3/52 in terms of electrical specifications, package dimensions, and pinout - the only difference is AEC-Q101 qualification. No PCB changes are required; however, SMBJ18HE3/52 should be selected specifically when automotive qualification, extended temperature validation, or enhanced process controls are mandated for SMBJ18HE3/52 deployment.
What is the maximum reverse leakage current for SMBJ18HE3/52 at 18 V?
The maximum reverse leakage current (ID) for SMBJ18HE3/52 at its stand-off voltage of 18 V is 1.0 µA, tested at TA = 25 °C. This ultra-low leakage ensures minimal power loss in always-on circuits and avoids false triggering in high-impedance sensing nodes - a critical parameter verified per Vishay's Electrical Characteristics table for SMBJ18HE3/52.
SMBJ18HE3/52 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:
- 1
- Bidirectional Channels:
- -
- 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 (SMBJ)
SMBJ18HE3/52 FAQ
1.How can I place an order for SMBJ18HE3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ18HE3/52 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 SMBJ18HE3/52 reliable?
The price and inventory of SMBJ18HE3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ18HE3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ18HE3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ18HE3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ18HE3/52?
SMBJ18HE3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ18HE3/52 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 SMBJ18HE3/52?
For technical support, including SMBJ18HE3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ18HE3/52 requirements.
6.How does Aetrix verify that SMBJ18HE3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ18HE3/52 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 SMBJ18HE3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ18HE3/52?
All SMBJ18HE3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ18HE3/52, 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 SMBJ18HE3/52 part is unused and in its original packaging.
Return procedure for SMBJ18HE3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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