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Vishay General Semiconductor - Diodes Division SMBJ18HE3/5B
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- Part No.:
- SMBJ18HE3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ18HE3/5B.pdf
- Description:
- TVS DIODE 18VWM 32.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,639
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Product details
Overview
SMBJ18HE3/5B from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on power and signal lines. It features a 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, and 600 W peak pulse power rating with 10/1000 µs waveform - used to protect MOSFETs, ICs, and sensor interfaces in industrial power supplies.
For engineers reviewing the SMBJ18HE3/5B datasheet, SMBJ18HE3/5B pinout, SMBJ18HE3/5B application, or SMBJ18HE3/5B equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification status, thermal resistance (RθJA = 100 °C/W), junction temperature range (−55 to +150 °C), and compliance with UL 497B surge protector classification.
Technical Context
The SMBJ18HE3/5B operates as a silicon avalanche diode with glass-passivated junction, delivering fast response time (<1 ps) and low incremental surge resistance to limit transient overvoltage before damage occurs. Its unidirectional configuration enables cathode-anode conduction only under reverse-bias surge conditions, with clamping action triggered when line voltage exceeds VBR.
Designed for surface-mount assembly on 0.2" × 0.2" copper pads per terminal, it supports automated placement and meets J-STD-020 MSL Level 1 (peak reflow 260 °C). The device sustains 100 A non-repetitive forward surge current (IFSM) and exhibits 0.092 %/°C temperature coefficient of VBR, ensuring stable clamping across operating temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC working margin. |
| VBR (min/max) | 20.0 V / 22.1 V at IT = 1 mA - Confirmed breakdown threshold range; ensures reliable turn-on during transients. |
| VC @ IPPM | 29.2 V at 20.5 A - Clamped voltage under 10/1000 µs surge; determines maximum stress imposed on protected circuitry. |
| PPPM | 600 W - Peak pulse power handling capability; validates robustness against lightning-induced or inductive-switching surges. |
| IFSM | 100 A - Single half-sine surge current rating (8.3 ms); supports protection of high-current power rails without failure. |
| TJ Range | −55 °C to +150 °C - Full operational junction temperature span; enables use in automotive engine bays and industrial enclosures. |
| Package | SMB (DO-214AA) - Standardized 2-pin surface-mount outline with 5.59 mm max length; compatible with IPC-7351B footprint. |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads; polarity indicated by cathode band on one end. Mounting requires 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal for rated thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry (unidirectional) | Connected to lower-potential side of protected line; conducts during forward surge events (e.g., ESD discharge path). |
| Cathode | Reverse-biased clamping node | Connected to higher-potential rail (e.g., VCC or signal line); initiates avalanche breakdown when VAK > VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and surge endurance - suitable for ADAS and body control modules. |
| 600 W peak pulse power | Handles high-energy transients (e.g., ISO 7637-2 Pulse 1/2a/5a) without degradation when mounted per recommended pad layout. |
| Low clamping ratio (VC/VWM ≈ 1.62) | Minimizes overvoltage overshoot during suppression - critical for protecting 24 V logic interfaces and CAN transceivers. |
| MSL Level 1 moisture sensitivity | Enables standard SMT reflow without baking; eliminates production delays and moisture-related delamination risk. |
| UL 497B recognized (QVGQ2) | Meets Underwriters Laboratories requirements for telecom and industrial surge protection devices - simplifies system-level certification. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Suppressing load-dump transients (ISO 7637-2 Pulse 5a) on 12 V/24 V battery-fed ECUs. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VBAT and ground to clamp spikes up to 120 V for <100 ms. Use Value: Limits voltage seen by downstream DC-DC converters and microcontrollers to ≤29.2 V, preventing latch-up or gate oxide rupture. |
Use Scenario: Guarding analog output lines (e.g., 4–20 mA current loop) from ESD and field-wiring faults. IC Role / Device Role / Timing Role: Connected anode-to-line, cathode-to-VCC to shunt positive transients toward supply rail. Use Value: Maintains signal integrity below 29.2 V clamping level while surviving ≥10 kV contact ESD per IEC 61000-4-2. |
| Telecom Line Card Surge Suppression | Consumer Power Adapter Input Stage |
|
Use Scenario: Protecting Ethernet PHY power pins and auxiliary bias rails from lightning-induced surges (IEC 61000-4-5). IC Role / Device Role / Timing Role: Mounted across input capacitor terminals to absorb differential-mode energy before reaching regulator ICs. Use Value: Delivers 600 W pulse power handling with <1 ns response, enabling compliance with GR-1089-CORE Level 3 surge immunity. |
Use Scenario: Safeguarding AC-DC primary-side rectifier outputs against switching transients and mains overvoltage. IC Role / Device Role / Timing Role: Placed cathode-to-rectified DC bus, anode-to-ground to clamp flyback spikes during MOSFET turn-off. Use Value: Withstands 100 A IFSM, ensuring no failure during repeated 264 VAC brownout recovery events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18A-E3/5B | Commercial-grade (non-AEC-Q101); identical VWM, VBR, VC, and PPPM; same SMB package. | Lacks automotive qualification; unsuitable for under-hood or safety-critical systems. | Select when cost-sensitive industrial or consumer designs do not require AEC-Q101 validation. |
| SMBJ18CAHE3/5B | Bidirectional variant; symmetric VBR (20.0–22.1 V) in both polarities; same PPPM and package. | Required for AC-coupled or floating signal lines where polarity reversal may occur (e.g., RS-485, audio inputs). | Choose for bidirectional protection needs; note that clamping occurs regardless of voltage polarity direction. |
Compared with SMBJ18A-E3/5B, SMBJ18HE3/5B adds AEC-Q101 qualification for automotive use without sacrificing electrical specs; compared with SMBJ18CAHE3/5B, it provides optimized unidirectional clamping for DC power rails, reducing leakage and improving efficiency in single-polarity systems.
Availability
SMBJ18HE3/5B is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, telecom line cards, and consumer power adapter designs requiring stable component supply and long-term lifecycle support.
Supply support for SMBJ18HE3/5B 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, rectifiers, MOSFETs, and protection devices with emphasis on reliability, power efficiency, and automotive-grade qualification.
The SMBJ series is engineered for high-energy transient suppression in harsh environments, targeting design-in across automotive, industrial automation, and communications infrastructure where robust overvoltage immunity is mandatory.
FAQ
What is the clamping voltage of SMBJ18HE3/5B at its rated peak pulse current?
The SMBJ18HE3/5B has a maximum clamping voltage (VC) of 29.2 V when subjected to its rated peak pulse current of 20.5 A using a 10/1000 µs waveform. This value is measured under standardized test conditions and defines the upper voltage limit imposed on protected circuitry during surge events. The SMBJ18HE3/5B maintains this clamping performance across its full operating temperature range and is validated per JEDEC standards.
Is SMBJ18HE3/5B suitable for automotive applications?
Yes, SMBJ18HE3/5B is AEC-Q101 qualified and specifically designed for automotive use, including engine control units, body electronics, and ADAS subsystems. Its qualification covers temperature cycling, highly accelerated life testing, and surge endurance under automotive environmental stress profiles. The SMBJ18HE3/5B meets UL 497B recognition and supports compliance with ISO 7637-2 transient immunity requirements.
How does the SMBJ18HE3/5B differ from the SMBJ18A-E3/5B?
The SMBJ18HE3/5B and SMBJ18A-E3/5B share identical electrical specifications (VWM, VBR, VC, PPPM) and SMB package, but SMBJ18HE3/5B carries AEC-Q101 qualification while SMBJ18A-E3/5B is commercial-grade only. This makes SMBJ18HE3/5B appropriate for automotive and mission-critical industrial applications where reliability validation is mandatory. Both parts use the same DO-214AA footprint and mounting recommendations.
What is the thermal resistance of SMBJ18HE3/5B, and how does it affect PCB layout?
The SMBJ18HE3/5B has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on minimum recommended 0.2" × 0.2" copper pads per terminal. To achieve rated power dissipation and avoid thermal runaway during repetitive surges, designers must adhere to this pad layout - increasing copper area reduces RθJA, while insufficient copper raises junction temperature beyond the 150 °C maximum. The SMBJ18HE3/5B's RθJL is 20 °C/W, supporting heat transfer through leads into internal PCB planes.
Does SMBJ18HE3/5B support bidirectional transient suppression?
No, SMBJ18HE3/5B is a unidirectional TVS diode - it clamps only when reverse-biased (cathode positive relative to anode). For bidirectional protection, Vishay offers the SMBJ18CAHE3/5B variant, which provides symmetrical clamping in both polarities. The SMBJ18HE3/5B's unidirectional architecture delivers lower leakage current and higher reliability in DC-biased applications such as power supply inputs and sensor VCC lines.
SMBJ18HE3/5B 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)
SMBJ18HE3/5B FAQ
1.How can I place an order for SMBJ18HE3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ18HE3/5B 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 SMBJ18HE3/5B reliable?
The price and inventory of SMBJ18HE3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ18HE3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ18HE3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ18HE3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ18HE3/5B?
SMBJ18HE3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ18HE3/5B 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 SMBJ18HE3/5B?
For technical support, including SMBJ18HE3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ18HE3/5B requirements.
6.How does Aetrix verify that SMBJ18HE3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ18HE3/5B 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 SMBJ18HE3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ18HE3/5B?
All SMBJ18HE3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ18HE3/5B, 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 SMBJ18HE3/5B part is unused and in its original packaging.
Return procedure for SMBJ18HE3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ18HE3/5B Tags
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