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Vishay General Semiconductor - Diodes Division SMB8J18CAHE3/5B
- Part No.:
- SMB8J18CAHE3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J18CAHE3/5B.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,880
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Product details
Overview
SMB8J18CAHE3/5B 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), 27.4 A peak pulse current (IPPM) under 10/1000 µs waveform, 29.2 V maximum clamping voltage (VC), and AEC-Q101 qualification for automotive electronics.
For engineers reviewing the SMB8J18CAHE3/5B datasheet, SMB8J18CAHE3/5B pinout, SMB8J18CAHE3/5B application, or SMB8J18CAHE3/5B equivalent, key selection criteria include bidirectional clamping capability, 800 W peak pulse power rating, low incremental surge resistance, and compatibility with automated SMT assembly on PCBs requiring IEC 61000-4-2/-4-5 level protection.
Technical Context
This device operates as a voltage-clamped shunt protector, responding within <1 ps to transients induced by inductive switching or ESD events. Its glass-passivated junction ensures stable breakdown behavior and low leakage (<1.0 µA at VWM = 18 V), while the bidirectional symmetry enables protection of AC-coupled or differential interfaces without polarity constraints.
The SMB8J18CAHE3/5B delivers 800 W peak pulse power dissipation per 10/1000 µs waveform at TA = 25 °C, with thermal resistance RθJA = 72 °C/W and RθJL = 20 °C/W. It is rated for operation from –55 °C to +150 °C junction temperature and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse operating voltage before clamping begins; defines safe signal swing range for protected line. |
| VBR (min/max) | 20.0 V / 22.1 V - Breakdown occurs within this range at 1 mA test current; ensures predictable turn-on threshold across production lot. |
| VC @ IPPM | 29.2 V - Clamping voltage at 27.4 A peak pulse current; limits downstream voltage stress during 800 W surge event. |
| IPPM (10/1000 µs) | 27.4 A - Peak surge current the device safely diverts without failure; supports robust protection against IEC 61000-4-5 combination wave. |
| PPPM | 800 W - Peak pulse power handling capacity; determines survivability under standardized lightning/surge test conditions. |
| ID @ VWM | <1.0 µA - Reverse leakage at stand-off voltage; minimizes quiescent power loss and avoids false triggering in high-impedance circuits. |
| TJ max. | +150 °C - Maximum junction temperature rating; enables use in under-hood automotive environments and industrial enclosures. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking. Matte tin-plated leads, compliant with J-STD-002 and JESD 22-B102 solderability standards. Meets UL 94 V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Bidirectional terminals - either end serves as anode or cathode depending on transient polarity; no color band or marking required. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - suitable for engine control, ADAS, and infotainment systems. |
| Glass passivated junction | Ensures consistent VBR tolerance and long-term stability under thermal stress and humidity exposure - critical for field-deployed industrial equipment. |
| Low profile SMB package | Height ≤ 2.20 mm - enables compact layout in space-constrained modules such as sensor nodes and motor drivers without sacrificing surge margin. |
| MSL Level 1 | Compatible with standard 260 °C Pb-free reflow profiles - eliminates pre-bake requirements and supports high-yield automated assembly. |
| 800 W peak pulse power | Supports IEC 61000-4-5 Level 3 (1 kV/2 Ω) and Level 4 (2 kV/2 Ω) surge immunity without derating - reduces need for cascaded protection stages. |
Applications
| Automotive Sensor Protection | Industrial CAN Bus Interface |
|---|---|
|
Use Scenario: Protecting LIN/CAN transceiver inputs and outputs from load dump and ISO 7637-2 pulses in body control modules. IC Role / Device Role / Timing Role: Bidirectional shunt clamp absorbing energy from ±100 V transients while maintaining signal integrity below 29.2 V. Use Value: Enables single-device protection of differential bus lines without polarity concerns, reducing BOM count and layout complexity. |
Use Scenario: Safeguarding RS-485/RS-422 transceivers in factory automation PLCs exposed to motor switching noise and ground bounce. IC Role / Device Role / Timing Role: Fast-response TVS limiting transient overvoltage on A/B data lines to prevent latch-up or damage to half-duplex transceivers. Use Value: Maintains communication uptime during 800 W surges with sub-nanosecond response - avoids protocol timeouts and system resets. |
| Consumer Power Adapter Input | Medical Equipment Signal Conditioning |
|
Use Scenario: Input-stage protection of AC-DC adapters against lightning-induced surges on primary-side rectifier outputs. IC Role / Device Role / Timing Role: Clamping 10/1000 µs surges up to 27.4 A before they reach downstream MOSFETs or controllers. Use Value: Eliminates need for series impedance or additional MOVs - simplifies input filter design while meeting UL 1449 Type 4 requirements. |
Use Scenario: Shielding analog front-end inputs of patient monitoring devices from ESD events during clinical handling. IC Role / Device Role / Timing Role: Low-leakage (<1 µA) bidirectional clamp preserving DC accuracy of 24-bit ADC reference paths. Use Value: Prevents measurement drift or fault lockup during 15 kV contact discharge - supports IEC 60601-1-2 4th edition compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18CAHE3/5B | Unidirectional variant with same VWM/VBR/VC but asymmetric conduction - requires polarity-aware layout. | Limited to DC-biased or unidirectional signal paths; unsuitable for true AC or differential lines. | Select only when circuit topology enforces fixed polarity and lower cost is prioritized over layout flexibility. |
| SMAJ18CAHE3/A | Same electrical specs but in smaller SMA (DO-214AC) package - 30 % lower PPPM (400 W) and higher RθJA (90 °C/W). | Not recommended for sustained surge duty or high ambient temperature environments (>85 °C). | Choose for space-constrained consumer designs where 400 W surge margin suffices and thermal headroom is available. |
Compared with SMB8J18CAHE3/5B, SMBJ18CAHE3/5B lacks bidirectional symmetry and requires careful orientation, while SMAJ18CAHE3/A trades package size for reduced surge capacity and thermal performance - making SMB8J18CAHE3/5B the optimal choice for automotive and industrial bidirectional protection.
Availability
SMB8J18CAHE3/5B is available at Aetrix Electronics and suitable for automotive ECUs, industrial motor drives, medical sensor interfaces, and telecom infrastructure requiring stable component supply with AEC-Q101 traceability and RoHS compliance.
Supply support for SMB8J18CAHE3/5B 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, TVS devices, and power MOSFETs with emphasis on reliability, efficiency, and application-specific optimization.
The SMB8JxxCA family targets high-reliability transient suppression in automotive and industrial settings, delivering AEC-Q101-qualified bidirectional TVS performance in the compact SMB footprint.
FAQ
What is the clamping voltage of SMB8J18CAHE3/5B at its rated peak pulse current?
The SMB8J18CAHE3/5B has a maximum clamping voltage (VC) of 29.2 V when subjected to its rated 27.4 A peak pulse current (IPPM) under the standard 10/1000 µs waveform. This value is measured at TJ = 25 °C and guarantees that protected circuitry will not experience voltages exceeding 29.2 V during an 800 W transient event, ensuring compatibility with 3.3 V, 5 V, and 12 V logic and interface ICs.
Is SMB8J18CAHE3/5B suitable for automotive applications?
Yes, SMB8J18CAHE3/5B is AEC-Q101 qualified and explicitly designated for automotive use via its "HE3" suffix. It undergoes rigorous stress testing including temperature cycling, highly accelerated life testing (HALT), and ESD validation. The device is deployed in engine control units, ADAS camera modules, and body electronics where it protects against load dump, jump-start, and ISO 7637-2 pulses - all while maintaining full functionality from –40 °C to +125 °C ambient.
How does the bidirectional nature of SMB8J18CAHE3/5B affect PCB layout?
The SMB8J18CAHE3/5B has symmetrical terminals with no polarity marking, allowing placement in either orientation across differential or AC-coupled signal paths. Unlike unidirectional TVS diodes, it eliminates the need for orientation verification during automated placement or manual inspection. This simplifies layout for CAN, LIN, RS-485, and audio lines - reducing assembly errors and enabling reuse across multiple interface types without redesign.
What is the thermal resistance of SMB8J18CAHE3/5B, and how does it impact power derating?
SMB8J18CAHE3/5B has a typical junction-to-ambient thermal resistance (RθJA) of 72 °C/W and junction-to-lead (RθJL) of 20 °C/W. At ambient temperatures above 25 °C, its 800 W peak pulse power must be linearly derated per Figure 2 in the datasheet - e.g., at 85 °C ambient, usable PPPM drops to ~560 W. Proper copper pad area (0.2" × 0.2") is essential to achieve published ratings and avoid thermal runaway during repetitive surges.
Does SMB8J18CAHE3/5B meet RoHS and halogen-free requirements?
Yes, SMB8J18CAHE3/5B carries the "HE3" suffix, indicating it is RoHS-compliant and AEC-Q101 qualified. It is not halogen-free - that designation applies only to "HM3" variants. The device uses matte tin-plated leads compliant with J-STD-002 and passes JESD 201 Class 2 whisker testing. Full material declarations and compliance documentation are available through Vishay's official portal using document number 88422.
SMB8J18CAHE3/5B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 18V
- Voltage - Breakdown (Min):
- 20V
- Voltage - Clamping (Max) @ Ipp:
- 29.2V
- Current - Peak Pulse (10/1000µs):
- 27.4A
- Power - Peak Pulse:
- 800W
- 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 (SMB)
SMB8J18CAHE3/5B FAQ
1.How can I place an order for SMB8J18CAHE3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J18CAHE3/5B 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 SMB8J18CAHE3/5B reliable?
The price and inventory of SMB8J18CAHE3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J18CAHE3/5B is usually 5 days.
3.What payment methods are accepted for SMB8J18CAHE3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J18CAHE3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J18CAHE3/5B?
SMB8J18CAHE3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J18CAHE3/5B 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 SMB8J18CAHE3/5B?
For technical support, including SMB8J18CAHE3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J18CAHE3/5B requirements.
6.How does Aetrix verify that SMB8J18CAHE3/5B is sourced from the original manufacturer or authorized distributors?
All SMB8J18CAHE3/5B 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 SMB8J18CAHE3/5B meets industry standards.
7.What is the process for return or replacement of SMB8J18CAHE3/5B?
All SMB8J18CAHE3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J18CAHE3/5B, 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 SMB8J18CAHE3/5B part is unused and in its original packaging.
Return procedure for SMB8J18CAHE3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J18CAHE3/5B Tags
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