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Vishay General Semiconductor - Diodes Division SMB8J18CHE3/52
- Part No.:
- SMB8J18CHE3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J18CHE3/52.pdf
- Description:
- TVS DIODE 18VWM 32.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,877
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Product details
Overview
SMB8J18CHE3/52 from Vishay General Semiconductor is a bi-directional transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, designed for robust overvoltage 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. It is AEC-Q101 qualified and used in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the SMB8J18CHE3/52 datasheet, SMB8J18CHE3/52 pinout, SMB8J18CHE3/52 application, or SMB8J18CHE3/52 equivalent, key selection criteria include bi-directional clamping capability, AEC-Q101 qualification, 18 V working voltage, thermal resistance (RθJA = 72 °C/W), and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This bi-directional TVS diode operates symmetrically across both polarities, enabling protection against voltage transients regardless of polarity-ideal for AC-coupled or floating signal lines. Its glass-passivated junction ensures stable breakdown behavior and low leakage (<1.0 µA at VWM), while the low incremental surge resistance supports fast energy dissipation during ESD or lightning-induced surges.
The device is rated for TJ = –55 °C to +150 °C operation and meets MSL Level 1 per J-STD-020 (peak reflow 260 °C). Its 72 °C/W junction-to-ambient thermal resistance requires careful PCB pad design-minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper per terminal-to sustain 800 W pulse power without thermal runaway.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - maximum continuous reverse operating voltage before clamping begins |
| VBR (min/max) | 20.0 V / 22.1 V - breakdown occurs within this range at 1.0 mA test current |
| VC @ IPPM | 29.2 V at 27.4 A - clamping voltage limits downstream circuit stress during 10/1000 µs surge |
| PPPM | 800 W - peak pulse power handling with standard 10/1000 µs waveform |
| ID @ VWM | ≤1.0 µA - ultra-low leakage preserves signal integrity in high-impedance circuits |
| TJ max. | 150 °C - enables use in under-hood automotive environments and industrial enclosures |
| RθJA | 72 °C/W - dictates minimum copper area required on PCB for thermal management |
Pinout & Package
Package: DO-214AA (SMB), surface-mount, bi-directional configuration with no polarity marking (unlike uni-directional variants which feature a cathode band).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bi-directional transient conduction path | No functional distinction between terminals; either terminal serves as anode or cathode depending on transient polarity |
| Case (cathode band absent) | Non-marked package body | Confirms bi-directional construction-no orientation dependency during placement |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per stress requirements |
| Glass passivated junction | Ensures consistent VBR tolerance and long-term stability under humidity and thermal stress |
| MSL Level 1 rating | Supports lead-free reflow up to 260 °C peak without moisture-induced failure |
| Low clamping ratio (VC/VBR ≈ 1.39) | Minimizes overvoltage overshoot during surge events, reducing risk to protected ICs |
| RoHS-compliant & halogen-free | Meets JEDEC JS709A and EU Directive 2011/65/EU for environmentally restricted substances |
Applications
| Automotive Sensor Interface | Industrial CAN Bus Line Protection |
|---|---|
Use Scenario: Protecting analog outputs of pressure/temperature sensors in engine control modules exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bi-directional voltage clamp placed directly at connector entry point to shunt transients before reaching precision ADC front-end. Use Value: 29.2 V clamping voltage ensures downstream 3.3 V or 5 V signal conditioning ICs remain below absolute maximum ratings during 100 V/50 ms load dump events. |
Use Scenario: Safeguarding CANH/CANL differential pair in factory automation gateways subjected to EFT bursts per IEC 61000-4-4. IC Role / Device Role / Timing Role: Paired SMB8J18CHE3/52 devices (one per line) provide symmetrical surge suppression without disrupting DC bias or signal integrity. Use Value: ≤1.0 µA leakage at 18 V VWM avoids CAN bus bias current errors; 800 W PPPM handles repetitive 4 kV EFT coupling without degradation. |
| Telecom DSL Line Interface | Consumer Smart Meter I/O Protection |
Use Scenario: Shielding ADSL/VDSL line drivers from lightning-induced surges entering via outdoor copper pairs. IC Role / Device Role / Timing Role: First-stage protector mounted at RJ-11 jack, preceding gas discharge tube (GDT) and series impedance. Use Value: 27.4 A IPPM and 29.2 V VC enable coordination with downstream GDTs to limit let-through energy to <10 mJ for PHY IC survival. |
Use Scenario: Securing RS-485 and pulse-output interfaces in utility meters installed in electrically noisy substations. IC Role / Device Role / Timing Role: Bi-directional clamp on isolated data lines to absorb induced surges from nearby switching transformers or relay coils. Use Value: AEC-Q101 qualification assures long-term reliability under thermal cycling (–40 °C to +85 °C ambient) and vibration typical of meter deployments. |
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 | Same DO-214AA package and 18 V VWM, but rated for 600 W PPPM (vs. 800 W) and higher VC (32.4 V) | Limited to lower-energy transients; not AEC-Q101 qualified | Select when cost sensitivity outweighs automotive qualification and higher surge margin |
| SMCJ18CA | DO-214AB (SMC) package, same 18 V VWM, 1500 W PPPM, lower RθJA (30 °C/W), but larger footprint | Requires PCB redesign; suited for primary-level protection where space permits | Choose for systems needing higher single-pulse energy absorption without cascaded protection stages |
Compared with SMBJ18CA and SMCJ18CA, SMB8J18CHE3/52 delivers superior surge margin (800 W) in a compact SMB outline while maintaining automotive qualification-making it optimal for space-constrained, high-reliability endpoints like sensor nodes and gateway interfaces.
Availability
SMB8J18CHE3/52 is available at Aetrix Electronics and suitable for automotive sensor protection, industrial CAN bus interfaces, telecom line protection, and smart meter I/O requiring stable component supply and AEC-Q101 compliance.
Supply support for SMB8J18CHE3/52 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 and application-specific performance.
The SMB8JxxCA series is part of Vishay's TRANSZORB® TVS portfolio, engineered for high-power-density, bi-directional transient suppression in automotive, industrial, and telecom infrastructure where AEC-Q101 validation and tight clamping are critical.
FAQ
What is the clamping voltage of SMB8J18CHE3/52 and how is it measured?
The SMB8J18CHE3/52 has a maximum clamping voltage (VC) of 29.2 V, measured at a peak pulse current (IPPM) of 27.4 A using the standardized 10/1000 µs double-exponential surge waveform. This value is guaranteed per the Vishay datasheet (Document Number: 88422, Rev. 12-Nov-12) and reflects worst-case voltage seen by protected circuitry during surge events. The SMB8J18CHE3/52 achieves this with low incremental resistance, ensuring predictable overvoltage limiting.
Is SMB8J18CHE3/52 suitable for automotive applications?
Yes, SMB8J18CHE3/52 is explicitly AEC-Q101 qualified, as confirmed in the Vishay datasheet (page 1, "FEATURES" section and page 3 footnote). It undergoes stress testing for temperature cycling, high-temperature reverse bias (HTRB), and ESD per AEC-Q101 requirements. Its –55 °C to +150 °C operating range and MSL Level 1 rating further support under-hood and module-integrated automotive use. The SMB8J18CHE3/52 is designed for such environments.
How does SMB8J18CHE3/52 differ from uni-directional SMB10J18A?
SMB8J18CHE3/52 is bi-directional with symmetrical breakdown (VBR min/max = 20.0 V / 22.1 V) and no polarity marking, while SMB10J18A is uni-directional with a cathode band and forward conduction capability. SMB8J18CHE3/52 offers 800 W PPPM and 29.2 V VC, whereas SMB10J18A provides 1000 W PPPM and 29.2 V VC-but only in reverse direction. The SMB8J18CHE3/52 is intended for AC or floating lines; SMB10J18A suits DC-biased rails.
What is the thermal resistance and recommended PCB layout for SMB8J18CHE3/52?
The SMB8J18CHE3/52 has a typical junction-to-ambient thermal resistance (RθJA) of 72 °C/W, measured with 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal (per datasheet Fig. 2 and "MECHANICAL DATA"). To maintain safe operation during 800 W pulses, each pad must be solid copper, thermally connected to internal planes if possible, and avoid narrow traces. The SMB8J18CHE3/52 thermal performance degrades rapidly with smaller pads or insufficient copper area.
Does SMB8J18CHE3/52 have RoHS and halogen-free compliance?
Yes, SMB8J18CHE3/52 carries the HE3 suffix, indicating RoHS-compliant construction per EU Directive 2011/65/EU and halogen-free status per JEDEC JS709A. Vishay confirms this in the "MECHANICAL DATA" section (page 1) and "Material Category Policy" (Document Number: 91000). The matte tin-plated leads meet J-STD-002 solderability standards, and the molding compound complies with UL 94 V-0 flammability rating. The SMB8J18CHE3/52 meets these environmental specifications.
SMB8J18CHE3/52 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:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 18V
- Voltage - Breakdown (Min):
- 20V
- Voltage - Clamping (Max) @ Ipp:
- 32.2V
- Current - Peak Pulse (10/1000µs):
- 24.8A
- 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)
SMB8J18CHE3/52 FAQ
1.How can I place an order for SMB8J18CHE3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J18CHE3/52 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 SMB8J18CHE3/52 reliable?
The price and inventory of SMB8J18CHE3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J18CHE3/52 is usually 5 days.
3.What payment methods are accepted for SMB8J18CHE3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J18CHE3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J18CHE3/52?
SMB8J18CHE3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J18CHE3/52 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 SMB8J18CHE3/52?
For technical support, including SMB8J18CHE3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J18CHE3/52 requirements.
6.How does Aetrix verify that SMB8J18CHE3/52 is sourced from the original manufacturer or authorized distributors?
All SMB8J18CHE3/52 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 SMB8J18CHE3/52 meets industry standards.
7.What is the process for return or replacement of SMB8J18CHE3/52?
All SMB8J18CHE3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J18CHE3/52, 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 SMB8J18CHE3/52 part is unused and in its original packaging.
Return procedure for SMB8J18CHE3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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