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Vishay General Semiconductor - Diodes Division SMBJ18AHE3_B/I
- Part No.:
- SMBJ18AHE3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ18AHE3_B/I.pdf
- Description:
- 600W,18V 5%,UNIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:3,911
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Product details
Overview
SMBJ18AHE3_B/I 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 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 (IPPM), and 600 W peak pulse power (10/1000 µs waveform), commonly deployed on power rails and I/O lines of industrial motor drives and automotive ECUs.
For engineers reviewing the SMBJ18AHE3_B/I datasheet, SMBJ18AHE3_B/I pinout, SMBJ18AHE3_B/I application, or SMBJ18AHE3_B/I equivalent, key selection criteria include its AEC-Q101 qualification, low clamping ratio (VC/VBR ≈ 1.37), 1.0 µA max reverse leakage at VWM, and compatibility with automated SMT assembly on standard PCB pad layouts per JEDEC DO-214AA footprint.
Technical Context
This TVS diode operates as a unidirectional avalanche clamp, leveraging glass-passivated junction technology to deliver sub-nanosecond response time and stable breakdown behavior under repetitive transients. Its thermal resistance (RθJA = 100 °C/W) and junction temperature range (–55 °C to +150 °C) support reliable operation in high-ambient environments such as under-hood automotive modules and industrial PLC backplanes.
The device meets MSL level 1 per J-STD-020 with 260 °C peak reflow profile, uses matte tin-plated leads compliant with J-STD-002 and JESD 22-B102, and is qualified to AEC-Q101 for automotive-grade reliability - confirmed by the "HE3" suffix and "_B/I" tape-and-reel packaging code indicating 3200-unit 13″ reel delivery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse operating voltage before significant leakage; defines safe DC/AC rail protection threshold. |
| VBR (min/max) | 20.0 V / 22.1 V at IT = 1 mA - Confirmed breakdown window ensures predictable turn-on during fast transients. |
| VC @ IPPM | 29.2 V at 20.5 A (10/1000 µs) - Clamping voltage limits downstream IC stress; clamping ratio = 1.37 supports MOSFET gate and MCU I/O protection. |
| PPPM | 600 W - Peak surge energy handling capacity under standardized lightning/surge test waveform; enables single-device protection for 24 V systems. |
| ID @ VWM | ≤1.0 µA - Ultra-low reverse leakage preserves battery life and signal integrity in always-on sensor nodes and low-power microcontrollers. |
| TJ max. | +150 °C - Enables deployment in engine control units, power converters, and other high-temperature industrial enclosures without derating. |
| Package | SMB (DO-214AA) - Standardized 2-pin surface-mount outline with 5.0 mm × 3.94 mm body; compatible with automated pick-and-place and IR/reflow processes. |
Pinout & Package
Package: SMB (DO-214AA), 2-terminal surface-mount case with cathode band marking. Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H); terminals are matte tin-plated for solderability per J-STD-002.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; connected to protected circuit ground or low-side reference. | Provides low forward voltage drop (<3.5 V at 50 A) during surge conduction; polarity must align with system ground topology. |
| Cathode | Current exit terminal in forward bias; marked by band; connected to protected line (e.g., 24 V rail or signal trace). | Defines unidirectional clamping direction: transients above VBR pull cathode toward anode potential, shunting energy to ground. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and ADAS sensors - no additional qualification testing required for Tier-1 programs. |
| 600 W peak pulse power (10/1000 µs) | Handles IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) on 24 V supply lines without failure or parameter shift. |
| Low clamping voltage (29.2 V) | Protects 3.3 V/5 V logic interfaces and 20 V-rated MOSFETs when placed upstream of LDOs or DC-DC converters. |
| MSL Level 1, 260 °C peak reflow | Supports single-pass lead-free reflow without popcorn cracking or bond wire damage - eliminates pre-baking requirements. |
| Glass passivated junction | Ensures stable VBR over 1000+ surge events and >10-year field life in humid, thermally cycled environments. |
Applications
| Industrial Motor Drives | Automotive Engine Control Units |
|---|---|
|
Use Scenario: Protection of 24 V DC bus against inductive kickback from solenoid valves and relay coils. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp transients <100 ns after onset. Use Value: Limits voltage excursion to ≤29.2 V, preventing latch-up or gate oxide rupture in half-bridge drivers and CAN transceivers. |
Use Scenario: Surge suppression on injector driver outputs exposed to load dump and jump-start conditions. IC Role / Device Role / Timing Role: Primary overvoltage clamp on high-side switch output node, coordinated with fuse and current sense. Use Value: Withstands 100 A surge (IFSM) and maintains VBR stability across –40 °C to +150 °C ambient, meeting ISO 7637-2 Pulse 5a requirements. |
| Telecom Power Supplies | Industrial Sensor Signal Conditioning |
|
Use Scenario: Input-stage protection for 48 V telecom rectifiers subjected to lightning-induced surges on AC mains input. IC Role / Device Role / Timing Role: First-line transient suppressor ahead of bulk capacitor and PFC controller. Use Value: 600 W rating enables coordination with upstream MOVs and downstream TVS arrays to achieve Class III surge immunity per IEC 61000-4-5. |
Use Scenario: Protection of analog front-end inputs (e.g., 4–20 mA loop receivers) in factory automation sensors. IC Role / Device Role / Timing Role: Low-leakage (≤1 µA) unidirectional clamp on signal line referenced to isolated ground. Use Value: Prevents ESD damage during field wiring while introducing negligible offset error (<10 nA leakage impact on µA-level current loops). |
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/I | Halogen-free, RoHS-compliant variant with identical electrical specs and AEC-Q101 qualification. | Required for automotive programs mandating halogen-free BOMs (e.g., EU OEM Tier-1 compliance). | Select when environmental compliance exceeds standard RoHS; same layout, same thermal performance. |
| SMBJ18A-E3/5B | Commercial-grade (non-AEC-Q101), same SMB package, 7″ reel (750 pcs) vs. 13″ reel (3200 pcs); VBR and VC match within tolerance. | Suitable for non-automotive industrial or consumer applications where AEC qualification is not mandated. | Choose for cost-sensitive volume production outside automotive; verify lifecycle continuity separately. |
Compared with SMBJ18AHE3_B/I, the HM3 variant adds halogen-free assurance without trade-offs, while the E3/5B offers lower unit cost and smaller reel size at the expense of automotive qualification - enabling tiered sourcing based on end-equipment requirements.
Availability
SMBJ18AHE3_B/I is available at Aetrix Electronics and suitable for industrial motor drives, automotive engine control units, and telecom power supplies requiring stable component supply, long-term lifecycle support, and AEC-Q101-certified reliability.
Supply support for SMBJ18AHE3_B/I 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 is engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where robustness, AEC-Q101 validation, and precise clamping performance are mandatory.
FAQ
What is the clamping voltage of SMBJ18AHE3_B/I at its rated peak pulse current?
The SMBJ18AHE3_B/I has a maximum clamping voltage (VC) of 29.2 V at 20.5 A peak pulse current (IPPM) under the 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and guarantees that downstream components see no more than 29.2 V during a defined surge event - critical for protecting 3.3 V, 5 V, and 20 V-rated ICs. The SMBJ18AHE3_B/I achieves this with a clamping ratio of approximately 1.37 relative to its minimum VBR of 20.0 V.
Is SMBJ18AHE3_B/I qualified for automotive applications?
Yes, SMBJ18AHE3_B/I is AEC-Q101 qualified, as confirmed by the "HE3" suffix and documentation in Vishay's 88392 datasheet. This qualification covers stress tests including high-temperature operating life, temperature cycling, and surge robustness - making SMBJ18AHE3_B/I suitable for engine control units, body control modules, and ADAS subsystems. Its MSL Level 1 rating and 150 °C max junction temperature further support under-hood deployment.
What does the "_B/I" suffix mean in SMBJ18AHE3_B/I?
The "_B/I" suffix in SMBJ18AHE3_B/I indicates two attributes: "B" denotes the revision level (document revision B), and "I" specifies the packaging format - a 13″ diameter plastic tape-and-reel containing 3200 units. This differs from "H"-suffixed variants (7″ reel, 750 units). Both share identical electrical and mechanical specifications; only logistics and reel size differ. The SMBJ18AHE3_B/I is fully interchangeable in design and assembly with other HE3 variants of the same base part number.
How does SMBJ18AHE3_B/I compare to bidirectional TVS diodes like SMBJ18CA?
SMBJ18AHE3_B/I is unidirectional and intended for DC rail protection where polarity is fixed (e.g., 24 V supply to ground), offering lower leakage (<1.0 µA) and tighter VBR tolerance than bidirectional types. In contrast, SMBJ18CA protects AC or polarity-agnostic lines but exhibits higher ID (up to 2.0 µA) and symmetric clamping in both directions. Use SMBJ18AHE3_B/I when protecting grounded DC systems; choose SMBJ18CA only when signal lines lack defined polarity or require symmetrical surge handling.
What is the thermal resistance and maximum power dissipation of SMBJ18AHE3_B/I?
The SMBJ18AHE3_B/I has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on standard 0.2″ × 0.2″ copper pads, and a steady-state power dissipation (PD) rating of 5.0 W at TA = 50 °C. These values define its ability to dissipate heat during sustained overvoltage events or elevated ambient temperatures. For continuous operation near 150 °C junction limit, derating per Figure 2 in the datasheet is required - confirming SMBJ18AHE3_B/I's suitability in sealed enclosures or high-power industrial modules.
SMBJ18AHE3_B/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- 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:
- 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/I FAQ
1.How can I place an order for SMBJ18AHE3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ18AHE3_B/I 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/I reliable?
The price and inventory of SMBJ18AHE3_B/I 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/I is usually 5 days.
3.What payment methods are accepted for SMBJ18AHE3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ18AHE3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ18AHE3_B/I?
SMBJ18AHE3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ18AHE3_B/I 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/I?
For technical support, including SMBJ18AHE3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ18AHE3_B/I requirements.
6.How does Aetrix verify that SMBJ18AHE3_B/I is sourced from the original manufacturer or authorized distributors?
All SMBJ18AHE3_B/I 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/I meets industry standards.
7.What is the process for return or replacement of SMBJ18AHE3_B/I?
All SMBJ18AHE3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ18AHE3_B/I, 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/I part is unused and in its original packaging.
Return procedure for SMBJ18AHE3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ18AHE3_B/I Tags
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