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Vishay General Semiconductor - Diodes Division SMBJ18AHE3_A/I
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- Part No.:
- SMBJ18AHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ18AHE3_A/I.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,555
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Product details
Overview
SMBJ18AHE3_A/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), deployed on power rails and signal lines in industrial sensor interfaces.
For engineers reviewing the SMBJ18AHE3_A/I datasheet, SMBJ18AHE3_A/I pinout, SMBJ18AHE3_A/I application, or SMBJ18AHE3_A/I equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, thermal resistance (RθJA = 100 °C/W), junction temperature range (–55 to +150 °C), and RoHS-compliant packaging details - all critical for automotive-grade ESD/surge protection design-in.
Technical Context
This TVS diode operates as a unidirectional clamping device with cathode-band polarity marking, leveraging a glass-passivated silicon junction for fast response (<1 ns) and low incremental surge resistance. Its 600 W peak pulse power rating is specified under standardized 10/1000 µs waveform conditions with 0.01 % duty cycle, and it maintains stable clamping performance across –55 °C to +150 °C operating junction temperature.
The SMBJ18AHE3_A/I is rated for 5.0 W steady-state power dissipation at TA = 50 °C on infinite heatsink, exhibits ≤1.0 µA reverse leakage at VWM = 18 V, and supports 100 A non-repetitive forward surge current (IFSM, 8.3 ms half-sine). It meets MSL Level 1 per J-STD-020 and is qualified to AEC-Q101 for automotive applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse operating voltage before clamping initiates; defines safe working margin for 18 V DC rail protection. |
| VBR min/max | 20.0 V / 22.1 V at IT = 1 mA - Confirmed breakdown threshold range ensures reliable turn-on during transients without premature conduction. |
| VC @ IPPM | 29.2 V at 20.5 A - Clamped voltage during 10/1000 µs surge; limits downstream IC stress to sub-30 V under worst-case 600 W event. |
| PPPM | 600 W - Peak pulse power handling capability with standardized waveform; enables protection against IEC 61000-4-5 Level 3 surges. |
| TJ max | +150 °C - Maximum junction temperature rating; supports operation in under-hood automotive and industrial ambient environments. |
| RθJA | 100 °C/W - Thermal resistance from junction to ambient on standard PCB pad layout; informs derating requirements above 25 °C ambient. |
| AEC-Q101 | Qualified - Validated for automotive reliability including HTOL, TC, UHAST, and ESD testing; suitable for ASIL-B supporting systems. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, matte tin-plated leads, UL 94 V-0 molding compound. Cathode identified by band marking on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction | Connected to protected line's low-side or ground return path; enables clamping when transient exceeds VBR. |
| Cathode | Current exit terminal during reverse-biased clamping | Connected to protected line's high-side (e.g., 18 V rail); conducts surge current to ground when transient exceeds VWM/VBR. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables single-device protection against severe lightning-induced surges per IEC 61000-4-5, reducing need for cascaded protection stages. |
| AEC-Q101 qualification | Validates long-term reliability in automotive environments including thermal cycling, humidity, and vibration exposure per automotive standards. |
| Low clamping ratio (VC/VBR ≈ 1.42) | Minimizes voltage overshoot during clamping - critical for safeguarding 24 V tolerant interfaces like CAN FD transceivers and MCU I/Os. |
| MSL Level 1, 260 °C reflow compatible | Supports standard lead-free SMT assembly without moisture sensitivity concerns or pre-bake requirements. |
| Glass passivated junction | Ensures stable leakage current (<1 µA at VWM) and consistent VBR over lifetime, even under high-humidity or high-temperature bias conditions. |
Applications
| Automotive Body Control Module (BCM) Power Input | Industrial PLC Digital Input Protection |
|---|---|
|
Use Scenario: Protects 12–18 V supply input of BCM microcontrollers and driver ICs from load-dump transients and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed between input rail and chassis ground. Use Value: Limits transient voltage to ≤29.2 V during 600 W surge events, preventing latch-up or gate oxide damage in downstream PMICs and MCUs. |
Use Scenario: Shields 24 V digital input channels of programmable logic controllers from inductive kickback and field-wiring ESD. IC Role / Device Role / Timing Role: Standoff-clamp TVS connected in parallel with optocoupler input stage. Use Value: Responds in <1 ns to clamp 1 kV/500 A surge (IEC 61000-4-5), preserving signal integrity and enabling >100 k-cycle input reliability. |
| Telecom Remote Radio Unit (RRU) DC Feed Line | Consumer Appliance Motor Driver Board |
|
Use Scenario: Safeguards PoE+ or hybrid DC feed lines powering remote radio units against lightning-induced common-mode surges. IC Role / Device Role / Timing Role: Primary unidirectional clamping element on DC input before DC/DC converter. Use Value: Withstands repetitive 10/1000 µs surges up to 600 W while maintaining <1 µA leakage at 18 V, ensuring minimal standby power loss. |
Use Scenario: Protects H-bridge gate drivers and current-sense amplifiers on washing machine motor control boards from commutation spikes. IC Role / Device Role / Timing Role: Rail-to-ground TVS on 18 V auxiliary supply feeding driver ICs and op-amps. Use Value: Clamps 100 A 8.3 ms surge (IFSM) without degradation, extending board-level MTBF beyond 10 years in high-vibration 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 |
|---|---|---|---|
| SMBJ18AHM3_A/I | Halogen-free, RoHS-compliant variant with identical electrical specs and AEC-Q101 qualification. | No functional difference; selected where halogen-free compliance is mandated by OEM environmental policy. | Direct material substitution when halogen-free BOM requirement applies; same footprint, thermal, and electrical behavior. |
| SMBJ18A-E3/5B | Commercial-grade (non-AEC-Q101), same SMB package, identical VWM/VBR/VC/PPPM, but no automotive qualification or extended temperature validation. | Restricted to non-automotive industrial or consumer use; not approved for ASIL-relevant subsystems. | Cost-optimized alternative for non-automotive designs where AEC-Q101 is not required; verify TJ derating for high-temp operation. |
Compared with SMBJ18AHE3_A/I, the HM3 variant adds halogen-free compliance without trade-offs, while the E3/5B version removes automotive qualification - making the HE3 suffix essential for validated automotive deployment, especially in BCM and ADAS power domains.
Availability
SMBJ18AHE3_A/I is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC I/O modules, telecom remote radio units, and appliance motor control systems requiring stable component supply with full AEC-Q101 traceability and RoHS compliance.
Supply support for SMBJ18AHE3_A/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, MOSFETs, optoelectronics, and passive components with emphasis on reliability, efficiency, and application-specific optimization.
The SMBJ series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-energy transient suppression in automotive, industrial, and telecom infrastructure where robustness, fast response, and AEC-Q101 validation are mandatory.
FAQ
What is the clamping voltage of SMBJ18AHE3_A/I at its rated peak pulse current?
The SMBJ18AHE3_A/I has a maximum clamping voltage (VC) of 29.2 V at its rated peak pulse current (IPPM) of 20.5 A, measured under the standardized 10/1000 µs waveform. This value is guaranteed per Vishay's datasheet revision 09-Jan-2024 (Document Number: 88392) and defines the upper voltage limit imposed on protected circuitry during surge events. The SMBJ18AHE3_A/I maintains this clamping performance across its full operating temperature range.
Is SMBJ18AHE3_A/I qualified for automotive applications?
Yes, SMBJ18AHE3_A/I is explicitly AEC-Q101 qualified, as confirmed in the Vishay datasheet under "MECHANICAL DATA" and "ORDERING INFORMATION" sections. The "HE3" suffix denotes RoHS-compliant and AEC-Q101 qualified construction, validated for automotive use including thermal cycling, humidity, and surge endurance. This makes SMBJ18AHE3_A/I suitable for ASIL-B supporting systems such as body control modules and infotainment power supplies.
What does the "A/I" suffix mean in SMBJ18AHE3_A/I?
The "A/I" suffix in SMBJ18AHE3_A/I indicates packaging configuration: "A" refers to the revision code (per Vishay's ordering nomenclature), and "I" specifies 13-inch diameter plastic tape-and-reel delivery containing 3200 units. This matches the preferred package code "I" listed in the "ORDERING INFORMATION" table of the datasheet (Document Number: 88392), confirming standard SMT-compatible bulk packaging for automated placement.
How does SMBJ18AHE3_A/I differ from SMBJ18A-E3/5B?
SMBJ18AHE3_A/I and SMBJ18A-E3/5B share identical electrical characteristics (VWM = 18 V, VC = 29.2 V, PPPM = 600 W) and SMB package, but differ in qualification: SMBJ18AHE3_A/I is AEC-Q101 qualified and RoHS-compliant, whereas SMBJ18A-E3/5B is commercial-grade only. The "HE3" suffix confirms automotive validation; "E3/5B" denotes RoHS-compliant commercial packaging in 3200-unit reel. SMBJ18AHE3_A/I is required for automotive designs; SMBJ18A-E3/5B suffices for industrial non-automotive use.
What is the thermal resistance and maximum junction temperature of SMBJ18AHE3_A/I?
SMBJ18AHE3_A/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 maximum operating junction temperature (TJ max) of +150 °C. These values are specified in the "THERMAL CHARACTERISTICS" and "MAXIMUM RATINGS" tables of the Vishay datasheet (88392). The +150 °C rating enables reliable operation in under-hood automotive environments and high-temperature industrial enclosures, provided appropriate PCB copper area and airflow are maintained.
SMBJ18AHE3_A/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:
- Obsolete
- 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_A/I FAQ
1.How can I place an order for SMBJ18AHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ18AHE3_A/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_A/I reliable?
The price and inventory of SMBJ18AHE3_A/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_A/I is usually 5 days.
3.What payment methods are accepted for SMBJ18AHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ18AHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ18AHE3_A/I?
SMBJ18AHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ18AHE3_A/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_A/I?
For technical support, including SMBJ18AHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ18AHE3_A/I requirements.
6.How does Aetrix verify that SMBJ18AHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SMBJ18AHE3_A/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_A/I meets industry standards.
7.What is the process for return or replacement of SMBJ18AHE3_A/I?
All SMBJ18AHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ18AHE3_A/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_A/I part is unused and in its original packaging.
Return procedure for SMBJ18AHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ18AHE3_A/I Tags
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