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Vishay General Semiconductor - Diodes Division SMB8J18CAHE3_B/I
- Part No.:
- SMB8J18CAHE3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J18CAHE3_B/I.pdf
- Description:
- 800W,18V 5%,BIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:8,540
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Product details
Overview
SMB8J18CAHE3_B/I 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 standoff voltage (VWM), 27.4 A peak pulse current (IPPM) under 10/1000 µs waveform, and clamps transients to ≤29.2 V at rated surge, meeting AEC-Q101 for automotive electronics.
For engineers reviewing the SMB8J18CAHE3_B/I datasheet, SMB8J18CAHE3_B/I pinout, SMB8J18CAHE3_B/I application, or SMB8J18CAHE3_B/I equivalent, key selection criteria include bidirectional clamping capability, 800 W peak pulse power rating, AEC-Q101 qualification, low leakage (<1.0 µA at 18 V), and compatibility with automated SMT assembly on standard PCB pad layouts.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector, responding within picoseconds to transient overvoltages induced by ESD, inductive switching, or lightning surges. Its glass-passivated junction ensures stable breakdown behavior and low incremental surge resistance, while the bidirectional configuration enables symmetric clamping across both polarities without polarity sensitivity.
The device is rated for 150 °C maximum junction temperature and exhibits a typical thermal resistance of 20 °C/W (junction-to-lead), supporting reliable operation under repeated surge stress when mounted on 5.0 mm × 5.0 mm copper pads. It complies with ANSI/IEEE C62.35 and meets MSL level 1 per J-STD-020 at 260 °C peak reflow.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 18 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating margin for 12 V automotive or 15 V industrial bus lines. |
| VBR (Breakdown Voltage) | 20.0–22.1 V at 1 mA - Confirmed breakdown threshold range; ensures predictable turn-on during overvoltage events. |
| VC (Clamping Voltage) | ≤29.2 V at IPPM - Maximum voltage seen by protected circuit during 27.4 A surge; guarantees downstream ICs remain below absolute maximum ratings. |
| PPPM (Peak Pulse Power) | 800 W (10/1000 µs) - Energy-handling capacity for standardized surge waveforms; supports IEC 61000-4-5 Level 3 (1 kV/2 Ω) compliance. |
| ID (Reverse Leakage) | ≤1.0 µA at 18 V - Negligible standby current; avoids signal distortion or battery drain in always-on sensor interfaces. |
| TJ max. | 150 °C - Enables use in under-hood automotive environments and industrial enclosures without derating at full power. |
| AEC-Q101 Qualified | Yes - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per AEC specification. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional - no polarity marking; symmetrical two-terminal construction with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient shunt path | Either terminal serves as input/output; bidirectional conduction enables clamping of positive and negative transients without orientation dependency. |
| Case (body) | Thermal and mechanical interface | Plastic molded case provides UL 94 V-0 flammability rating; thermal path to PCB copper via leads supports 20 °C/W junction-to-lead dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines (e.g., CAN, LIN, sensor bridges) without polarity concerns. |
| AEC-Q101 qualification | Validates long-term reliability in automotive powertrain, body control, and ADAS modules where field failure is unacceptable. |
| Low clamping ratio (VC/VWM = 1.62) | Minimizes voltage overshoot during surge events-critical for protecting 3.3 V or 5 V logic interfaces downstream of the TVS. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow without baking; simplifies SMT line integration and reduces manufacturing overhead. |
| Glass-passivated junction | Ensures stable VBR over time and temperature, with low parameter drift across 1000+ surge cycles per JEDEC standards. |
Applications
| Automotive Sensor Protection | Industrial CAN Bus Interface |
|---|---|
|
Use Scenario: Protecting analog output lines of pressure, temperature, or position sensors in engine control units exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Shunt TVS placed directly at connector entry point to clamp transients before reaching precision ADC front-end or op-amp signal conditioning stage. Use Value: Maintains signal integrity by limiting voltage excursion to ≤29.2 V during 10/1000 µs surges up to 800 W, preventing latch-up or parametric shift in downstream analog circuitry. |
Use Scenario: Safeguarding differential CANH/CANL lines in factory automation gateways subject to EFT bursts and cable discharge events. IC Role / Device Role / Timing Role: Bidirectional TVS connected across CAN bus pair to absorb common-mode and differential transients without disrupting DC bias or signal timing. Use Value: Clamps both polarities symmetrically to ≤29.2 V, preserving CAN physical layer eye diagram integrity and ensuring >10,000 insertion loss-free cycles per IEC 61000-4-4. |
| Consumer USB Port ESD Protection | Power Supply Input Stage |
|
Use Scenario: Secondary-level ESD protection on USB 2.0 D+/D− lines in smart home hubs after primary TVS array, targeting system-level IEC 61000-4-2 ±15 kV contact discharge. IC Role / Device Role / Timing Role: Fast-response shunt element placed adjacent to USB controller IC to divert ESD current away from internal ESD structures. Use Value: Sub-nanosecond response and <1.0 µA leakage prevent data corruption or false disconnect detection while maintaining USB 2.0 signal rise/fall time compliance. |
Use Scenario: Input rail protection for 24 V industrial SMPS front-ends subjected to 100 V/10 ms surges per IEC 61000-4-5. IC Role / Device Role / Timing Role: Primary surge limiter placed between input connector and bulk capacitor to absorb energy before it reaches rectifier and controller IC. Use Value: 800 W peak power rating and 27.4 A IPPM enable single-device handling of 1 kV/2 Ω surge tests without cascading failure or thermal runaway. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMB8J18CAHM3_B/I | Halogen-free variant with identical electrical specs and AEC-Q101 qualification; same SMB package and pinout. | No difference in circuit function or layout; selected only when halogen-free compliance is mandated by OEM or regional regulation. | Choose SMB8J18CAHM3_B/I if RoHS + halogen-free material declaration is required; otherwise SMB8J18CAHE3_B/I offers standard commercial-grade compliance. |
| SMCJ18CAHE3_A/H | Higher-power SMC (DO-214AB) package with 1500 W PPPM rating; same 18 V VWM and bidirectional configuration. | Used where higher surge margin is needed (e.g., outdoor telecom power inputs); requires larger PCB footprint and different pad layout. | Select SMCJ18CAHE3_A/H only when 800 W is insufficient and board space allows SMC footprint; SMB8J18CAHE3_B/I remains optimal for space-constrained automotive modules. |
Compared with SMB8J18CAHM3_B/I, SMB8J18CAHE3_B/I offers identical protection performance with standard RoHS compliance but excludes halogen-free certification; versus SMCJ18CAHE3_A/H, it trades 70% lower surge rating for 40% smaller PCB area and tighter thermal coupling to board copper.
Availability
SMB8J18CAHE3_B/I is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial CAN bus nodes, consumer USB port hardening, and 24 V power supply input stages requiring stable component supply with AEC-Q101 traceability.
Supply support for SMB8J18CAHE3_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, MOSFETs, optoelectronics, and passive components with emphasis on reliability, power density, and application-specific validation.
The SMB8JxxCA series belongs to Vishay's TRANSZORB® TVS platform, engineered specifically for high-reliability transient suppression in automotive, industrial, and communications infrastructure where AEC-Q101 qualification and consistent clamping performance are mandatory.
FAQ
What is the clamping voltage of SMB8J18CAHE3_B/I at its rated peak pulse current?
The SMB8J18CAHE3_B/I has 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 confirmed in Vishay's Document Number 88422, ensuring predictable overvoltage limiting for protected circuits. The SMB8J18CAHE3_B/I maintains this clamping performance across its qualified operating temperature range.
Is SMB8J18CAHE3_B/I suitable for automotive applications?
Yes, SMB8J18CAHE3_B/I is AEC-Q101 qualified and explicitly designated for automotive use with the "HE3" suffix indicating RoHS-compliant, AEC-Q101-qualified construction. It is validated for temperature cycling, high-temperature reverse bias, and ESD robustness per automotive requirements, making it appropriate for engine control units, body electronics, and ADAS sensor modules. The SMB8J18CAHE3_B/I meets MSL Level 1 and supports reflow profiles up to 260 °C.
What does the "_B/I" suffix mean in SMB8J18CAHE3_B/I?
The "_B/I" suffix in SMB8J18CAHE3_B/I denotes packaging configuration: "B" indicates tape-and-reel format with embossed carrier tape, and "I" specifies a 13-inch diameter reel containing 3200 units. This differs from "_B/H", which uses a 7-inch reel with 750 units. Both share identical electrical and mechanical specifications; the suffix solely identifies reel size and quantity for logistics and SMT placement equipment setup. The SMB8J18CAHE3_B/I is fully compatible with standard pick-and-place feeders calibrated for 13″ reels.
How does SMB8J18CAHE3_B/I differ from unidirectional variants like SMB10J18AHE3_B/I?
SMB8J18CAHE3_B/I is bidirectional with symmetrical clamping for both polarities, whereas SMB10J18AHE3_B/I is unidirectional and conducts only in reverse bias. The SMB8J18CAHE3_B/I has lower peak pulse power (800 W vs. 1000 W) and lower IPPM (27.4 A vs. 34.2 A) due to bidirectional design trade-offs, but enables protection of AC or floating lines without polarity constraints. Both share the same VWM (18 V) and SMB package, but the SMB8J18CAHE3_B/I is preferred for CAN, LIN, and differential signaling where polarity is undefined.
What is the maximum reverse leakage current for SMB8J18CAHE3_B/I at its standoff voltage?
The SMB8J18CAHE3_B/I exhibits a maximum reverse leakage current (ID) of 1.0 µA when biased at its 18 V standoff voltage (VWM), measured at 25 °C per Vishay's datasheet Document Number 88422. This ultra-low leakage preserves signal fidelity in high-impedance sensor interfaces and minimizes quiescent power loss in battery-powered systems. The SMB8J18CAHE3_B/I maintains leakage below 5.0 µA even at 125 °C junction temperature, supporting stable operation across automotive thermal ranges.
SMB8J18CAHE3_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:
- -
- 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/I FAQ
1.How can I place an order for SMB8J18CAHE3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J18CAHE3_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 SMB8J18CAHE3_B/I reliable?
The price and inventory of SMB8J18CAHE3_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 SMB8J18CAHE3_B/I is usually 5 days.
3.What payment methods are accepted for SMB8J18CAHE3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J18CAHE3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J18CAHE3_B/I?
SMB8J18CAHE3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J18CAHE3_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 SMB8J18CAHE3_B/I?
For technical support, including SMB8J18CAHE3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J18CAHE3_B/I requirements.
6.How does Aetrix verify that SMB8J18CAHE3_B/I is sourced from the original manufacturer or authorized distributors?
All SMB8J18CAHE3_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 SMB8J18CAHE3_B/I meets industry standards.
7.What is the process for return or replacement of SMB8J18CAHE3_B/I?
All SMB8J18CAHE3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J18CAHE3_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 SMB8J18CAHE3_B/I part is unused and in its original packaging.
Return procedure for SMB8J18CAHE3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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