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Vishay General Semiconductor - Diodes Division SMBJ18AHE3/5B
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- Part No.:
- SMBJ18AHE3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ18AHE3/5B.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,569
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Product details
Overview
SMBJ18AHE3/5B 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 signal lines in industrial and automotive electronics.
For engineers reviewing the SMBJ18AHE3/5B datasheet, SMBJ18AHE3/5B pinout, SMBJ18AHE3/5B application, or SMBJ18AHE3/5B equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification status, 1.0 µA max reverse leakage at VWM, thermal resistance (RθJA = 100 °C/W), and compatibility with automated SMT placement on standard PCB pad layouts.
Technical Context
This TVS diode operates as a voltage-clamping protection device that conducts during overvoltage events above its breakdown threshold, diverting surge current away from sensitive downstream circuitry. Its glass-passivated junction ensures stable avalanche characteristics and low incremental surge resistance.
The SMBJ18AHE3/5B is rated for 100 A non-repetitive forward surge current (IFSM) and supports operating junction temperatures from –55 °C to +150 °C. It meets MSL Level 1 per J-STD-020 and is qualified to AEC-Q101 for automotive applications when ordered with HE3 suffix.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse working voltage before clamping begins; defines safe operating margin below breakdown. |
| VBR min/max | 20.0 V / 22.1 V at IT = 1 mA - Confirmed breakdown range ensures reliable turn-on during transients without premature conduction. |
| VC @ IPPM | 29.2 V at 20.5 A - Clamping voltage under 10/1000 µs surge defines worst-case stress imposed on protected IC or MOSFET. |
| PPPM | 600 W - Peak pulse power handling capability determines survivability against lightning-induced or inductive-switching surges. |
| IPPM | 20.5 A - Peak pulse current rating directly maps to surge energy absorption (E ≈ 0.5 × VC × IPPM × tp). |
| RθJA | 100 °C/W - Junction-to-ambient thermal resistance informs derating requirements for sustained power dissipation in real PCB layouts. |
| Leakage ID | 1.0 µA max at VWM - Low reverse leakage minimizes standby power loss and avoids false triggering in high-impedance circuits. |
Pinout & Package
Package: SMB (DO-214AA) - Surface-mount plastic case with matte tin-plated leads, compliant with J-STD-002 and JESD 22-B102 solderability standards; meets UL 94 V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | High-side connection point for unidirectional clamping | Connected to protected line (e.g., VIN or signal); conducts surge current to ground when transient exceeds VBR. |
| Anode | Low-side reference terminal | Typically tied to system ground or return path; completes clamping loop during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity testing, and surge endurance per AEC specification. |
| 600 W peak pulse power | Enables robust protection against IEC 61000-4-5 Level 4 (4 kV) surges when properly mounted on 5.0 mm × 5.0 mm copper pads. |
| Fast response time & low clamping ratio | Sub-nanosecond response and VC/VBR ≈ 1.46 ensure minimal overvoltage exposure to downstream components. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and reflow compatibility up to 260 °C peak without baking or special handling. |
| Glass passivated junction | Improves long-term stability of breakdown voltage and reduces parameter drift across temperature and lifetime. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump and alternator ripple transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp positive-going spikes above 22.1 V. Use Value: Limits voltage seen by MCU power supply to ≤29.2 V during 600 W surges, preventing latch-up or permanent damage. |
Use Scenario: Shielding analog outputs of pressure/temperature sensors from ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-capacitance TVS connected across differential signal pair to suppress sub-100 ns transients without distorting signal integrity. Use Value: 1.0 µA leakage preserves sensor offset accuracy; 29.2 V clamping prevents ADC input saturation during ±8 kV contact ESD. |
| Telecom DC Power Input Protection | Consumer Device USB Port Surge Suppression |
|
Use Scenario: Safeguarding PoE-powered switches and media converters against induced surges on 48 V DC inputs. IC Role / Device Role / Timing Role: Primary clamping device upstream of DC-DC converter, sized for 10/1000 µs lightning surge waveforms. Use Value: Withstands repetitive 20.5 A pulses at 0.01% duty cycle; RθJA = 100 °C/W enables thermal design with minimal copper area. |
Use Scenario: Adding secondary-level surge immunity to USB VBUS lines in portable speakers and smart home hubs. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VBUS and GND to absorb hot-plug transients and ESD from user interface cables. Use Value: SMB package footprint allows integration near USB connector; AEC-Q101 qualification ensures field reliability in consumer logistics environments. |
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-E3/5B | No AEC-Q101 qualification; commercial-grade only; identical electrical specs and SMB package. | Suitable for non-automotive industrial or consumer use where automotive reliability certification is not required. | Select when cost sensitivity outweighs need for automotive qualification and full traceability. |
| SAC18 | Same VWM (18 V) but lower PPPM (400 W); smaller SOD-123FL package; higher VC (34.5 V). | Better suited for space-constrained designs with lower surge threat levels (e.g., IEC 61000-4-2 ESD only). | Choose for compact layouts where 600 W surge immunity is not mandated and board space is critical. |
Compared with SMBJ18AHE3/5B, the SMBJ18A-E3/5B offers identical clamping performance without automotive qualification, while SAC18 trades surge capacity and clamping tightness for reduced footprint - making SMBJ18AHE3/5B optimal for AEC-Q101-compliant 600 W protection where reliability and thermal margin are prioritized.
Availability
SMBJ18AHE3/5B is available at Aetrix Electronics and suitable for automotive control units, industrial sensor interfaces, and telecom power supplies requiring stable component supply with full AEC-Q101 traceability and long-term lifecycle support.
Supply support for SMBJ18AHE3/5B 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, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific optimization.
The SMBJ series was developed to deliver high-power transient suppression in compact surface-mount packages for automotive, industrial, and communications systems demanding AEC-Q101 compliance and repeatable clamping behavior.
FAQ
What is the clamping voltage of SMBJ18AHE3/5B at its rated peak pulse current?
The SMBJ18AHE3/5B has a maximum clamping voltage (VC) of 29.2 V at its rated peak pulse current (IPPM) of 20.5 A under a 10/1000 µs waveform. This value defines the upper voltage limit imposed on protected circuitry during surge events and is measured with the device mounted on 0.2" × 0.2" copper pads per the Vishay datasheet test condition.
Is SMBJ18AHE3/5B suitable for bidirectional transient protection?
No, SMBJ18AHE3/5B is a unidirectional TVS diode - it clamps only positive-going transients relative to ground. For bidirectional protection, Vishay offers the SMBJ18CA variant. The "A" suffix in SMBJ18AHE3/5B explicitly denotes unidirectional polarity, with the cathode band indicating the high-side terminal.
Does SMBJ18AHE3/5B require derating at elevated ambient temperatures?
Yes, SMBJ18AHE3/5B must be derated above TA = 25 °C per Figure 2 in the Vishay datasheet. Its peak pulse power capability decreases linearly with junction temperature, reaching ~50% of 600 W at TJ = 100 °C. Thermal design must account for RθJA = 100 °C/W and actual PCB copper area to maintain safe operation.
What does the "HE3" suffix indicate in SMBJ18AHE3/5B?
The "HE3" suffix in SMBJ18AHE3/5B indicates RoHS-compliant construction with AEC-Q101 qualification. It distinguishes this automotive-grade version from commercial variants like SMBJ18A-E3/5B. The "5B" denotes 13-inch tape-and-reel packaging with 3200 units per reel, optimized for high-volume SMT assembly.
Can SMBJ18AHE3/5B be used in place of SMBJ18A-E3/5B without layout changes?
Yes, SMBJ18AHE3/5B shares identical SMB (DO-214AA) mechanical dimensions, pinout, and solder pad requirements with SMBJ18A-E3/5B. No PCB layout modifications are needed; the substitution adds AEC-Q101 qualification and full traceability while maintaining all electrical and thermal performance parameters.
SMBJ18AHE3/5B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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 (SMBJ)
SMBJ18AHE3/5B FAQ
1.How can I place an order for SMBJ18AHE3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ18AHE3/5B 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 SMBJ18AHE3/5B reliable?
The price and inventory of SMBJ18AHE3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ18AHE3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ18AHE3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ18AHE3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ18AHE3/5B?
SMBJ18AHE3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ18AHE3/5B 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 SMBJ18AHE3/5B?
For technical support, including SMBJ18AHE3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ18AHE3/5B requirements.
6.How does Aetrix verify that SMBJ18AHE3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ18AHE3/5B 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 SMBJ18AHE3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ18AHE3/5B?
All SMBJ18AHE3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ18AHE3/5B, 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 SMBJ18AHE3/5B part is unused and in its original packaging.
Return procedure for SMBJ18AHE3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ18AHE3/5B Tags
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