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Vishay General Semiconductor - Diodes Division SMB8J18CAHE3_B/H
- Part No.:
- SMB8J18CAHE3_B/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J18CAHE3_B/H.pdf
- Description:
- 800W,18V 5%,BIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:7,140
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Product details
Overview
SMB8J18CAHE3_B/H from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for high-energy surge protection on signal and power lines. It features a 18 V stand-off voltage (VWM), 29.2 V clamping voltage (VC) at 27.4 A peak pulse current (IPPM), and 800 W peak pulse power (PPPM) with 10/1000 μs waveform - deployed in automotive sensor interfaces, industrial I/O modules, and telecom line protection.
For engineers reviewing the SMB8J18CAHE3_B/H datasheet, SMB8J18CAHE3_B/H pinout, SMB8J18CAHE3_B/H application, or SMB8J18CAHE3_B/H equivalent, this AEC-Q101 qualified TVS offers verified bidirectional clamping performance, low leakage (<1.0 μA at VWM), and MSL Level 1 moisture sensitivity - critical for automotive-grade board-level ESD and lightning surge resilience without derating penalties.
Technical Context
This device operates as a voltage-clamped shunt protector: under transient overvoltage exceeding its breakdown threshold (20.0–22.1 V), it avalanches rapidly to divert surge current away from downstream circuitry. Its glass-passivated junction ensures stable VBR tolerance and low incremental surge resistance, enabling consistent clamping across repeated 10/1000 μs surges.
Designed for bidirectional operation, SMB8J18CAHE3_B/H has symmetrical breakdown characteristics and no polarity marking - eliminating orientation errors during automated placement. Its thermal resistance (RθJA = 72 °C/W) and junction temperature rating (TJ max = 150 °C) support sustained operation in engine bay and industrial control environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - maximum continuous reverse operating voltage before conduction begins; defines safe signal swing margin in protected circuits. |
| VBR min/max | 20.0 V / 22.1 V at 1.0 mA - guaranteed avalanche onset range; ensures predictable turn-on timing across production lots. |
| VC @ IPPM | 29.2 V at 27.4 A - clamping voltage under full-rated 10/1000 μs surge; determines maximum stress imposed on protected ICs. |
| PPPM | 800 W - peak pulse power handling per 10/1000 μs waveform; quantifies single-event surge energy absorption capability. |
| ID @ VWM | <1.0 μA - reverse leakage at stand-off voltage; minimizes standby power loss and avoids false triggering in high-impedance nodes. |
| TJ max | +150 °C - maximum junction temperature; enables deployment in under-hood automotive and high-ambient industrial settings. |
| AEC-Q101 | Qualified - validated for automotive reliability including temperature cycling, HTRB, and ESD robustness per JESD22 standards. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking. Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H); matte tin-plated leads, J-STD-002 solderable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient current path | Both terminals function identically; bidirectional clamping occurs regardless of surge polarity - eliminates layout polarity constraints. |
| Case (body) | Thermal and mechanical interface | Exposed copper pad area (0.2" × 0.2") required per terminal for RθJA = 72 °C/W; enables reliable heat dissipation during repetitive surges. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive electronics - supports PPAP compliance and long-term reliability in ADAS sensors and body control modules. |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles without baking; reduces manufacturing risk and cost in high-volume SMT lines. |
| Glass-passivated junction | Ensures stable VBR over lifetime and temperature; prevents parameter drift in harsh thermal cycling environments (−55 °C to +150 °C). |
| Low clamping ratio (VC/VWM = 1.62) | Minimizes overvoltage exposure to protected ICs - critical for 3.3 V/5 V logic interfacing with legacy 12 V/24 V bus systems. |
| RoHS-compliant & halogen-free option | HE3 suffix denotes RoHS-compliant construction; HM3 variant available for strict environmental compliance in EU/China markets. |
Applications
| Automotive Sensor Interface | Industrial Digital I/O Protection |
|---|---|
|
Use Scenario: Protecting LIN/CAN transceiver inputs and analog sensor outputs (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional shunt clamp placed directly at connector entry point to limit transient voltage before reaching precision ADC or MCU GPIO. Use Value: Clamps 800 W surges to ≤29.2 V while maintaining <1.0 μA leakage - preserving signal integrity and avoiding false triggers in 12-bit sensor readings. |
Use Scenario: Safeguarding PLC digital input cards against inductive kickback from solenoid valves and relay coils in factory automation systems. IC Role / Device Role / Timing Role: Parallel-connected TVS on 24 V DC input lines, absorbing repetitive 10/1000 μs transients up to 27.4 A without degradation. Use Value: Enables >100,000 surge cycles at rated power due to low RθJL (20 °C/W) and stable avalanche behavior - reducing field failure rates. |
| Telecom Line Interface | Consumer Power Adapter ESD Protection |
|
Use Scenario: Shielding Ethernet PHY differential pairs and PoE detection circuitry from lightning-induced surges on outdoor network ports. IC Role / Device Role / Timing Role: Bidirectional TVS placed across each pair (e.g., TX+/TX−) with matched capacitance to avoid signal skew. Use Value: Delivers 29.2 V clamping at 27.4 A with <100 pF junction capacitance (typ.) - meeting IEEE 802.3af surge immunity without compromising 100BASE-TX bandwidth. |
Use Scenario: Protecting USB-C and barrel jack inputs in wall adapters against user-handling ESD (±8 kV contact) and AC line transients. IC Role / Device Role / Timing Role: Primary-level TVS on secondary-side DC output rails, clamping fast-rising ESD events before reaching LDOs or charging ICs. Use Value: Responds in <1 ns to sub-nanosecond ESD events while sustaining 800 W surges - preventing latch-up and permanent damage in compact form factors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18CA-E3/52 | Same SMB package and 18 V VWM, but lower PPPM (600 W) and higher VC (32.4 V); non-AEC-Q101, commercial grade only. | Limited to consumer/industrial use where automotive qualification and 800 W surge headroom are not required. | Select when cost sensitivity outweighs AEC-Q101 compliance and higher clamping voltage is acceptable. |
| SMCJ18CAHE3_A/H | Same VWM and AEC-Q101 rating, but larger SMC (DO-214AB) package; higher PPPM (1500 W) and lower VC (29.2 V at 51.7 A). | Better suited for high-energy surges (e.g., 12 V battery line protection), but requires larger PCB footprint and higher assembly cost. | Choose when surge energy exceeds 800 W and board space permits SMC footprint - no redesign needed for same circuit function. |
Compared with SMBJ18CA-E3/52, SMB8J18CAHE3_B/H delivers 33 % higher surge power and automotive qualification; versus SMCJ18CAHE3_A/H, it trades 44 % smaller footprint for 47 % lower peak current capacity - optimizing space-constrained automotive modules where 800 W suffices.
Availability
SMB8J18CAHE3_B/H is available at Aetrix Electronics and suitable for automotive ECU design, industrial PLC I/O protection, and telecom infrastructure requiring stable component supply with AEC-Q101 traceability and RoHS compliance.
Supply support for SMB8J18CAHE3_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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMB8J series is part of Vishay's TRANSZORB® TVS family, engineered specifically for high-power-density, automotive-grade transient suppression in space-constrained and thermally demanding environments.
FAQ
What is the clamping voltage of SMB8J18CAHE3_B/H at its rated peak pulse current?
The SMB8J18CAHE3_B/H exhibits a maximum clamping voltage (VC) of 29.2 V when subjected to its rated peak pulse current (IPPM) of 27.4 A under the standard 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and guarantees that protected circuitry will not experience voltages exceeding 29.2 V during an 800 W transient event - a critical parameter for safeguarding 3.3 V or 5 V logic interfaces downstream of the SMB8J18CAHE3_B/H.
Is SMB8J18CAHE3_B/H suitable for automotive applications?
Yes, SMB8J18CAHE3_B/H is AEC-Q101 qualified and explicitly designated for automotive use via its HE3 suffix. It undergoes rigorous stress testing including temperature cycling, high-temperature reverse bias (HTRB), and ESD validation per JESD22 standards. The device is deployed in engine control units, ADAS camera modules, and body electronics where sustained operation from −55 °C to +150 °C and immunity to ISO 7637-2 pulses are mandatory - all verified for SMB8J18CAHE3_B/H.
What does the "_B/H" suffix in SMB8J18CAHE3_B/H indicate?
The "_B/H" suffix in SMB8J18CAHE3_B/H specifies packaging and reel configuration: "B" denotes the revision code (per Vishay's internal revision tracking), and "H" indicates a 7-inch diameter plastic tape-and-reel format containing 750 units. This matches Vishay's ordering convention in Document Number 88422, where "H" corresponds to the preferred package code for 7″ reels - ensuring correct procurement alignment with Aetrix Electronics' inventory and SMT line requirements for SMB8J18CAHE3_B/H.
How does SMB8J18CAHE3_B/H differ from unidirectional variants like SMB10J18AHE3_B/H?
SMB8J18CAHE3_B/H is bidirectional with symmetrical breakdown (20.0–22.1 V in both directions) and no cathode band marking, whereas SMB10J18AHE3_B/H is unidirectional with a defined cathode end and forward voltage drop (~3.5 V at 50 A). The "C" in SMB8J18CAHE3_B/H explicitly denotes bidirectionality, making it suitable for AC-coupled or polarity-agnostic lines (e.g., RS-485, CAN, Ethernet), while SMB10J18AHE3_B/H is reserved for DC rail protection where forward conduction must be blocked - a functional distinction confirmed in Vishay's Electrical Characteristics tables for SMB8J18CAHE3_B/H.
What is the maximum reverse leakage current for SMB8J18CAHE3_B/H at its stand-off voltage?
The maximum reverse leakage current (ID) for SMB8J18CAHE3_B/H is 1.0 μA when biased at its rated stand-off voltage (VWM) of 18 V, measured at TA = 25 °C. This ultra-low leakage preserves signal integrity in high-impedance sensor front-ends and avoids unnecessary power drain in battery-operated systems - a specification rigorously tested and guaranteed across the full operating temperature range (−55 °C to +150 °C) for SMB8J18CAHE3_B/H.
SMB8J18CAHE3_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:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 18V
- Voltage - Breakdown (Min):
- 20V
- Voltage - Clamping (Max) @ Ipp:
- 18V
- Current - Peak Pulse (10/1000µs):
- 27.4A
- Power - Peak Pulse:
- 800W
- 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)
SMB8J18CAHE3_B/H FAQ
1.How can I place an order for SMB8J18CAHE3_B/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J18CAHE3_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 SMB8J18CAHE3_B/H reliable?
The price and inventory of SMB8J18CAHE3_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 SMB8J18CAHE3_B/H is usually 5 days.
3.What payment methods are accepted for SMB8J18CAHE3_B/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J18CAHE3_B/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J18CAHE3_B/H?
SMB8J18CAHE3_B/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J18CAHE3_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 SMB8J18CAHE3_B/H?
For technical support, including SMB8J18CAHE3_B/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J18CAHE3_B/H requirements.
6.How does Aetrix verify that SMB8J18CAHE3_B/H is sourced from the original manufacturer or authorized distributors?
All SMB8J18CAHE3_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 SMB8J18CAHE3_B/H meets industry standards.
7.What is the process for return or replacement of SMB8J18CAHE3_B/H?
All SMB8J18CAHE3_B/H units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J18CAHE3_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 SMB8J18CAHE3_B/H part is unused and in its original packaging.
Return procedure for SMB8J18CAHE3_B/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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