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Vishay General Semiconductor - Diodes Division SMBJ18AHE3_A/H
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- Part No.:
- SMBJ18AHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ18AHE3_A/H.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,292
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Product details
Overview
SMBJ18AHE3_A/H 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 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_A/H datasheet, SMBJ18AHE3_A/H pinout, SMBJ18AHE3_A/H application, or SMBJ18AHE3_A/H 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 and IEC 61000-4-2/4-4/4-5 surge immunity standards.
Technical Context
This TVS diode operates as a voltage-clamping protection device in series with sensitive downstream circuitry, activating when reverse voltage exceeds its breakdown threshold. Its glass-passivated junction ensures stable avalanche characteristics, low incremental surge resistance, and fast response time (<1 ns), enabling effective suppression of ESD, lightning-induced surges, and inductive switching transients.
The SMBJ18AHE3_A/H is rated for 600 W peak pulse power under 10/1000 µs waveform with 0.01% duty cycle, derated above 25 °C per Fig. 2, and supports 100 A non-repetitive forward surge current (IFSM, 8.3 ms half-sine). Its MSL Level 1 rating (JEDEC J-STD-020) and matte tin-plated leads ensure compatibility with standard reflow soldering processes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC bias margin for protected line. |
| VBR (min/max) | 20.0 V / 22.1 V at IT = 1 mA - Confirmed avalanche onset range; ensures predictable turn-on across production lot and temperature. |
| VC @ IPPM | 29.2 V at 20.5 A - Clamped voltage during 10/1000 µs surge; determines maximum stress imposed on downstream IC or MOSFET. |
| PPPM | 600 W - Peak transient energy handling capability; validates robustness against IEC 61000-4-5 Level 4 (4 kV) surges with proper PCB layout. |
| TJ max. | +150 °C - Maximum junction temperature; enables operation in under-hood automotive or high-ambient industrial environments. |
| RθJA | 100 °C/W - Thermal resistance junction-to-ambient on standard 0.2" × 0.2" copper pads; informs derating requirements for sustained power dissipation. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including HTOL, TC, UHAST, and ESD testing per AEC specification. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, low-profile case with cathode band marking. Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H); terminals are matte tin-plated, solderable per J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to ground or lower-potential rail in unidirectional configuration; carries surge current during clamping. |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., 12 V supply or CAN_H); initiates avalanche conduction when VAK > VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and ADAS sensors requiring long-term reliability under thermal cycling and humidity stress. |
| 600 W peak pulse power (10/1000 µs) | Supports IEC 61000-4-5 surge immunity up to 4 kV (line-to-earth) with appropriate PCB trace inductance and grounding. |
| Glass passivated junction | Ensures stable VBR tolerance and low leakage (<1 µA at VWM) over lifetime, critical for battery-powered or low-power sensor nodes. |
| MSL Level 1, 260 °C peak reflow | Enables single-pass lead-free reflow assembly without moisture-related popcorning or delamination risks. |
| UL 497B recognized (QVGQ2) | Meets safety certification requirements for telecom and industrial equipment where surge protectors must be listed components. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V power input to body control module (BCM) against load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional clamping device placed between fused battery rail and LDO input. Use Value: Limits transient voltage to ≤29.2 V, preventing damage to 36 V-rated LDOs and ensuring system reset-free operation during ISO 7637-2 Pulse 5a events. |
Use Scenario: Shielding analog output (4–20 mA) and digital I²C lines of pressure sensor in factory automation PLC. IC Role / Device Role / Timing Role: Point-of-entry TVS on each signal line, referenced to local ground plane. Use Value: Clamps ESD (±8 kV contact) and fast transients (IEC 61000-4-4, 40 A/50 ns) below sensor IC's absolute maximum ratings, preserving measurement integrity. |
| Telecom Line Card Surge Suppression | Consumer USB Power Delivery Protection |
|
Use Scenario: Safeguarding Ethernet PHY power pins (3.3 V, 5 V) on telecom access switch line cards exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Secondary-level TVS after gas discharge tube (GDT) primary protection. Use Value: Provides low-clamping-voltage backup protection with <1 ns response, limiting residual surge to sub-30 V levels compatible with 3.3 V PHY IO tolerances. |
Use Scenario: Protecting VBUS line of USB-C port in portable monitor against hot-plug transients and cable-induced ringing. IC Role / Device Role / Timing Role: Unidirectional TVS placed between connector and USB PD controller's overvoltage detection input. Use Value: Withstands 600 W surges while maintaining 18 V stand-off, avoiding false OVP trips during normal 5–20 V PD negotiation. |
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/H | Halogen-free, RoHS-compliant variant with identical electrical specs and AEC-Q101 qualification; same SMB package and pinout. | No functional difference; selected when halogen-free material compliance is required by OEM environmental policy. | Direct drop-in replacement where halogen-free content is mandated; no design or layout change needed. |
| SMAJ18AHE3/A | Lower 400 W PPPM rating, SMA (DO-214AC) package (smaller footprint, higher RθJA = 140 °C/W), same VWM/VBR/VC values. | Reduced surge robustness and higher thermal impedance limit use to lower-energy transients or better-cooled layouts. | Consider only for space-constrained consumer designs with verified <400 W surge exposure; not suitable for automotive or industrial mains-connected systems. |
Compared with SMBJ18AHE3_A/H, the HM3 variant offers identical protection performance with halogen-free construction, while the SMAJ18AHE3/A trades surge margin and thermal performance for smaller size-making SMBJ18AHE3_A/H the optimal choice for AEC-Q101–required, high-energy industrial and automotive applications.
Availability
SMBJ18AHE3_A/H is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor nodes, telecom line cards, and USB-C power delivery systems requiring stable component supply, AEC-Q101 qualification, and repeatable surge immunity performance.
Supply support for SMBJ18AHE3_A/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, MOSFETs, and protection devices with emphasis on reliability, precision, and application-specific validation.
The SMBJ series is engineered for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom applications where consistent clamping behavior and long-term stability under thermal and electrical stress are mandatory.
FAQ
What is the polarity configuration of SMBJ18AHE3_A/H?
The SMBJ18AHE3_A/H is a unidirectional transient voltage suppressor diode, meaning it conducts only in reverse bias (cathode positive relative to anode) during overvoltage events. The cathode is marked by a band on the SMB package body. It does not conduct in forward direction beyond typical diode forward voltage (~3.5 V at 50 A), making it unsuitable for bidirectional signal line protection without pairing or using a CA-suffix variant.
Does SMBJ18AHE3_A/H meet automotive qualification standards?
Yes, SMBJ18AHE3_A/H is AEC-Q101 qualified, as confirmed in the Vishay datasheet (Document Number: 88392, Revision: 09-Jan-2024). This includes stress testing for high-temperature operating life, temperature cycling, unbiased highly accelerated stress test (UHAST), and ESD per JS-001. The "HE3" suffix explicitly denotes RoHS-compliant and AEC-Q101–qualified commercial grade.
What is the maximum clamping voltage of SMBJ18AHE3_A/H under surge conditions?
The SMBJ18AHE3_A/H has a maximum clamping voltage (VC) of 29.2 V at 20.5 A peak pulse current (IPPM), tested with a 10/1000 µs waveform. This value represents the upper limit of voltage seen by downstream circuitry during a full-rated 600 W transient event and is critical for ensuring protected ICs remain within their absolute maximum voltage ratings.
Can SMBJ18AHE3_A/H be used in bidirectional signal protection?
No, SMBJ18AHE3_A/H is strictly unidirectional and must not be used for bidirectional signal lines such as RS-485, CAN, or USB D+/D− without additional circuitry. For bidirectional protection, Vishay specifies the CA-suffix variant (e.g., SMBJ18CA), which has symmetrical breakdown in both directions and no polarity marking. Using SMBJ18AHE3_A/H on AC-coupled or differential lines risks forward conduction and failure.
What PCB layout guidance applies to SMBJ18AHE3_A/H for optimal surge performance?
For optimal transient suppression, mount SMBJ18AHE3_A/H with minimum trace length between the protected node and the device cathode, and connect the anode directly to a low-inductance ground plane using multiple vias. The datasheet specifies thermal derating based on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal; reducing pad area increases RθJA and reduces safe surge repetition rate.
SMBJ18AHE3_A/H 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/H FAQ
1.How can I place an order for SMBJ18AHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ18AHE3_A/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_A/H reliable?
The price and inventory of SMBJ18AHE3_A/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_A/H is usually 5 days.
3.What payment methods are accepted for SMBJ18AHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ18AHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ18AHE3_A/H?
SMBJ18AHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ18AHE3_A/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_A/H?
For technical support, including SMBJ18AHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ18AHE3_A/H requirements.
6.How does Aetrix verify that SMBJ18AHE3_A/H is sourced from the original manufacturer or authorized distributors?
All SMBJ18AHE3_A/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_A/H meets industry standards.
7.What is the process for return or replacement of SMBJ18AHE3_A/H?
All SMBJ18AHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ18AHE3_A/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_A/H part is unused and in its original packaging.
Return procedure for SMBJ18AHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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