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Vishay General Semiconductor - Diodes Division SMBJ18AHE3_B/H
- Part No.:
- SMBJ18AHE3_B/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ18AHE3_B/H.pdf
- Description:
- 600W,18V 5%,UNIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:5,305
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Product details
Overview
SMBJ18AHE3_B/H from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping fast-rising voltage transients on power and signal lines. 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 (10/1000 µs waveform), used to protect MOSFETs, ICs, and sensor interfaces in industrial and automotive electronics.
For engineers reviewing the SMBJ18AHE3_B/H datasheet, SMBJ18AHE3_B/H pinout, SMBJ18AHE3_B/H application, or SMBJ18AHE3_B/H equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, thermal resistance (RθJA = 100 °C/W), junction temperature range (−55 °C to +150 °C), and RoHS-compliant packaging details - all critical for ESD/surge protection design validation and BOM selection.
Technical Context
This unidirectional TVS diode operates as a voltage-clamping device triggered by reverse-biased avalanche breakdown. Its glass-passivated junction ensures stable VBR tolerance (±5%) and low incremental surge resistance, enabling consistent clamping performance under repetitive 10/1000 µs transients at 0.01% duty cycle.
Designed for surface-mount assembly on 0.2" × 0.2" copper pads per terminal, it delivers 5.0 W steady-state power dissipation at TA = 50 °C and supports 100 A non-repetitive forward surge current (IFSM, 8.3 ms half-sine), with polarity indicated by cathode band marking per JEDEC DO-214AA standard.
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 for protected circuitry. |
| VBR min/max | 20.0 V / 22.1 V at IT = 1 mA - Confirmed breakdown threshold range; ensures reliable turn-on within 10% tolerance under standardized test conditions. |
| VC @ IPPM | 29.2 V at 20.5 A - Clamped voltage during 600 W transient; limits downstream voltage stress to ≤29.2 V during worst-case surge event. |
| PPPM | 600 W (10/1000 µs) - Peak pulse power handling capability; validates robustness against IEC 61000-4-5 Level 4 surges when mounted per recommended pad layout. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive and high-ambient industrial environments. |
| RθJA | 100 °C/W - Junction-to-ambient thermal resistance; determines required PCB copper area and airflow for thermal management at 5.0 W PD. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing; supports use in ADAS and body control modules. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, matte tin-plated leads, MSL Level 1 (260 °C reflow peak), UL 94 V-0 molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Reverse-biased avalanche terminal | Connected to protected line (e.g., VBUS, CAN_H); conducts during overvoltage to shunt surge current to ground. |
| Anode | Reference/ground return path | Typically tied to system ground or low-impedance return plane; completes clamping loop with minimal inductance. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Validated clamping energy capacity for IEC 61000-4-5 surge immunity up to 4 kV (line-earth) in properly laid-out PCBs. |
| AEC-Q101 qualified (HE3 suffix) | Meets automotive reliability requirements including 1000-cycle temperature cycling and 1000-hour HTRB, enabling use in Tier-1 modules. |
| Low clamping ratio (VC/VBR ≈ 1.42) | Minimizes overvoltage overshoot during transient events, reducing risk of gate oxide damage in downstream MOSFETs and ICs. |
| Fast response time (<1 ps) | Sub-nanosecond avalanche turn-on ensures protection activation before sensitive components experience damaging voltage excursions. |
| RoHS-compliant & halogen-free option available | HM3 variant meets IPC-JEDEC J-STD-020 moisture sensitivity and JESD201 whisker resistance Class 2 standards. |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V battery-fed ECUs against load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional clamping device placed between VBAT and ground, activated only during positive transients. Use Value: Limits voltage to ≤29.2 V during 600 W surges, preventing latch-up or destruction of microcontrollers and CAN transceivers. |
Use Scenario: Safeguarding analog outputs of pressure/temperature sensors connected to PLC I/O modules. IC Role / Device Role / Timing Role: Reverse-biased TVS on sensor output line, clamping induced EFT bursts from relay switching or motor drives. Use Value: Maintains signal integrity by suppressing transients within 1 ps while adding <1 pF junction capacitance at zero bias. |
| Consumer USB Power Delivery Protection | Telecom DC Power Input Protection |
|
Use Scenario: Guarding USB-C VBUS lines in portable chargers and docking stations against hot-plug and cable discharge events. IC Role / Device Role / Timing Role: Standoff-rated TVS (18 V) placed upstream of buck converter input, absorbing 10/1000 µs surges without conduction during normal 5–20 V operation. Use Value: Enables compliance with USB PD 3.1 ESD immunity requirements while supporting 3 A continuous current via low RDS(on) path. |
Use Scenario: Securing −48 V DC telecom power inputs against lightning-induced surges and AC line cross faults. IC Role / Device Role / Timing Role: Unidirectional TVS configured anode-to-ground on negative rail, clamping positive-going transients toward common reference. Use Value: Withstands 100 A IFSM (8.3 ms) and maintains 1 µA leakage at −48 V, ensuring no standby power loss or false triggering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18AHM3_B/H | Halogen-free, RoHS-compliant, AEC-Q101 qualified - identical electrical specs but enhanced environmental compliance. | Required where halogen-free materials are mandated (e.g., EU public infrastructure, railway rolling stock). | Select SMBJ18AHM3_B/H when full halogen-free certification and JESD201 Class 2 whisker resistance are contractually required. |
| SMAJ18AHE3/A | Lower PPPM (400 W), larger VBR tolerance (±10%), SMA (DO-214AC) package - 30% smaller footprint, 25% lower surge rating. | Suitable for space-constrained consumer devices with lower surge immunity requirements (IEC 61000-4-2 Level 3 only). | Choose SMAJ18AHE3/A only if board area is critical and 400 W surge rating suffices; not drop-in due to different thermal mass and RθJA. |
Compared with SMBJ18AHE3_B/H, SMBJ18AHM3_B/H offers identical protection performance with halogen-free assurance, while SMAJ18AHE3/A trades 33% peak power and higher thermal resistance for reduced PCB area - making the former a direct material upgrade and the latter a size-optimized alternative requiring layout revision.
Availability
SMBJ18AHE3_B/H is available at Aetrix Electronics and suitable for automotive ECU designs, industrial sensor nodes, USB-C power delivery systems, and telecom DC input stages requiring stable component supply with AEC-Q101 qualification and long-term lifecycle support.
Supply support for SMBJ18AHE3_B/H 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, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMBJ series was engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where robustness, AEC-Q101 compliance, and precise clamping are mandatory.
FAQ
What is the clamping voltage of SMBJ18AHE3_B/H at its rated peak pulse current?
The SMBJ18AHE3_B/H has a maximum clamping voltage (VC) of 29.2 V at 20.5 A peak pulse current (IPPM), measured using the standard 10/1000 µs waveform. This value defines the upper voltage limit imposed on protected circuitry during a 600 W transient event and is confirmed in Vishay's datasheet Document Number 88392, page 2. The SMBJ18AHE3_B/H maintains this clamping performance across its qualified operating temperature range.
Is SMBJ18AHE3_B/H qualified for automotive applications?
Yes, SMBJ18AHE3_B/H is AEC-Q101 qualified, as indicated by the "HE3" suffix and confirmed in the Ordering Information table (page 3) and Thermal Characteristics note (page 3) of Vishay's datasheet 88392. This qualification covers temperature cycling, high-temperature reverse bias (HTRB), and ESD testing, making SMBJ18AHE3_B/H suitable for under-hood and chassis-mounted automotive modules including body control units and ADAS power supplies.
What is the standoff voltage (VWM) and why does it matter for SMBJ18AHE3_B/H?
The standoff voltage (VWM) of SMBJ18AHE3_B/H is 18 V - the maximum DC or RMS voltage the device can withstand continuously without entering avalanche conduction. This parameter ensures the SMBJ18AHE3_B/H remains non-conductive during normal operation (e.g., on a 12 V automotive bus or 15 V industrial supply), preventing leakage current and power loss while remaining ready to clamp transients exceeding this threshold. It is specified in the Electrical Characteristics table on page 2 of datasheet 88392.
How does the SMBJ18AHE3_B/H package differ from SMAJ or SMC variants?
SMBJ18AHE3_B/H uses the SMB (DO-214AA) package - 4.06 mm × 4.57 mm body with 2.18 mm lead length - offering higher surge capability (600 W) than SMAJ (400 W, DO-214AC) and lower thermal resistance than SMC (DO-214AB). Its RθJA of 100 °C/W and 0.2" × 0.2" pad requirement balance power handling and board space. Unlike SMC, SMBJ18AHE3_B/H fits standard pick-and-place feeders and supports tighter pitch layouts while maintaining AEC-Q101 qualification.
What is the maximum junction temperature and thermal resistance of SMBJ18AHE3_B/H?
The SMBJ18AHE3_B/H has a maximum junction temperature (TJ max) of +150 °C and a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" copper pads per terminal. These values are specified in the Thermal Characteristics table (page 3) and define its safe operating envelope: at 5.0 W power dissipation, ambient temperature must remain below +100 °C to avoid exceeding TJ max. Derating curves in Figure 2 confirm usable power drops linearly above TA = 25 °C.
SMBJ18AHE3_B/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Bulk
- 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:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMBJ18AHE3_B/H FAQ
1.How can I place an order for SMBJ18AHE3_B/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ18AHE3_B/H 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_B/H reliable?
The price and inventory of SMBJ18AHE3_B/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ18AHE3_B/H is usually 5 days.
3.What payment methods are accepted for SMBJ18AHE3_B/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ18AHE3_B/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ18AHE3_B/H?
SMBJ18AHE3_B/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ18AHE3_B/H 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_B/H?
For technical support, including SMBJ18AHE3_B/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ18AHE3_B/H requirements.
6.How does Aetrix verify that SMBJ18AHE3_B/H is sourced from the original manufacturer or authorized distributors?
All SMBJ18AHE3_B/H 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_B/H meets industry standards.
7.What is the process for return or replacement of SMBJ18AHE3_B/H?
All SMBJ18AHE3_B/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ18AHE3_B/H, 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_B/H part is unused and in its original packaging.
Return procedure for SMBJ18AHE3_B/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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