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Vishay General Semiconductor - Diodes Division SMB8J18CHE3/5B
- Part No.:
- SMB8J18CHE3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMB8J18CHE3/5B.pdf
- Description:
- TVS DIODE 18VWM 32.2VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,310
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Product details
Overview
SMB8J18CHE3/5B from Vishay General Semiconductor is a bi-directional transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, designed for high-energy surge protection on signal and power lines. It features 18 V stand-off voltage (VWM), 29.2 V maximum clamping voltage (VC) at 27.4 A peak pulse current (IPPM), and 800 W peak pulse power (PPPM) with 10/1000 µs waveform. Used in automotive sensor interfaces and industrial I/O protection where AEC-Q101 qualification and low capacitance are critical.
For engineers reviewing the SMB8J18CHE3/5B datasheet, SMB8J18CHE3/5B pinout, SMB8J18CHE3/5B application, or SMB8J18CHE3/5B equivalent, key selection factors include bi-directional clamping behavior, AEC-Q101 qualification status, 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 operates symmetrically across both polarities, with breakdown voltage (VBR) ranging from 20.0 V to 22.1 V at 1 mA test current. Its clamping performance is specified under standardized 10/1000 µs surge conditions per ANSI/IEEE C62.35, delivering consistent voltage limiting during fast transients induced by inductive switching or ESD events.
The device uses glass-passivated junction technology and meets MSL Level 1 per J-STD-020 with peak reflow temperature up to 260 °C. Its matte tin-plated leads comply with J-STD-002 and JESD 22-B102 solderability standards, and the HE3 suffix confirms AEC-Q101 qualification and JESD 201 Class 2 whisker resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse operating voltage before clamping begins; defines safe working range for protected line. |
| VBR (min/max) | 20.0 V / 22.1 V at 1 mA - Ensures reliable triggering above normal operating voltage while avoiding false clamping. |
| VC @ IPPM | 29.2 V at 27.4 A - Limits transient voltage seen by downstream ICs to safe levels during 10/1000 µs surges. |
| PPPM | 800 W - Peak pulse power handling capacity; determines survivability against defined lightning or EFT surges. |
| IPPM | 27.4 A - Peak surge current capability under standard 10/1000 µs waveform; used to size PCB trace and pad layout. |
| TJ max | 150 °C - Maximum junction temperature; sets thermal derating limits for sustained surge duty cycles. |
| RθJA | 72 °C/W - Thermal resistance from junction to ambient; informs heatsinking requirements on standard 5.0 mm × 5.0 mm pads. |
Pinout & Package
Package: DO-214AA (SMB), surface-mount, bi-directional configuration with no polarity marking. Case dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H); cathode band absent per bi-directional design.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bi-directional surge conduction path | No functional distinction between terminals; either terminal serves as anode or cathode depending on transient polarity. |
| Case (body) | Thermal and mechanical interface | DO-214AA molded body provides mechanical robustness and contributes to thermal dissipation via copper pad contact. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock testing. |
| Glass passivated junction | Enhances long-term stability and moisture resistance versus epoxy-passivated alternatives; improves surge lifetime. |
| MSL Level 1 (260 °C peak) | Enables single-reflow assembly without preconditioning; compatible with standard lead-free reflow profiles. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (<1 ns rise time), improving protection margin for sensitive ICs. |
| RoHS-compliant HE3 suffix | Meets EU RoHS Directive 2011/65/EU and JESD 201 Class 2 whisker resistance for high-reliability applications. |
Applications
| Automotive Sensor Interface | Industrial Digital I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from 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 surge energy before reaching signal conditioning circuitry. Use Value: Maintains 29.2 V clamping level during 27.4 A transients, ensuring downstream MCU GPIOs and ADC inputs remain within absolute maximum ratings. |
Use Scenario: Safeguarding PLC digital input modules exposed to relay coil flyback and motor drive noise in factory automation systems. IC Role / Device Role / Timing Role: Primary overvoltage suppression element on 24 V DC input lines, coordinated with series impedance for IEC 61000-4-5 compliance. Use Value: Delivers 800 W peak pulse power handling with <1 ns response time, preventing latch-up or permanent damage in microcontroller-based input buffers. |
| Telecom Line Interface | Consumer Appliance Control Board |
Use Scenario: Shielding Ethernet PHYs and PoE controllers from induced surges on RJ45 ports in enterprise switches and base stations. IC Role / Device Role / Timing Role: Secondary-level TVS deployed after gas discharge tube (GDT) primary protection to refine clamping voltage and absorb residual energy. Use Value: Symmetric bi-directional clamping ensures equal protection for differential pairs without polarity concerns during common-mode transients. |
Use Scenario: Securing microcontroller reset lines and button inputs in washing machines and HVAC controllers against ESD and power rail disturbances. IC Role / Device Role / Timing Role: Low-leakage (≤1.0 µA at 18 V) transient suppressor placed adjacent to MCU pins to avoid signal degradation during normal operation. Use Value: Enables direct integration into space-constrained control boards without requiring additional filtering components or layout isolation. |
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 VWM (18 V), same DO-214AA package, but non-AEC-Q101 rated and E3 (not HE3) suffix. | Lacks automotive qualification; suitable only for commercial/industrial environments without AEC stress requirements. | Select when cost sensitivity outweighs automotive reliability needs and JEDEC whisker testing is not required. |
| SMCJ18CA | Higher PPPM (1500 W), larger DO-214AB (SMC) package, identical VWM and clamping voltage. | Requires larger PCB footprint and higher thermal mass; better suited for higher-energy surge environments (e.g., AC mains input). | Choose when system-level surge testing exceeds IEC 61000-4-5 Level 4 and 800 W is insufficient. |
Compared with SMBJ18CA, SMB8J18CHE3/5B adds AEC-Q101 qualification and JESD 201 Class 2 whisker resistance-critical for automotive ECUs-while SMB8J18CHE3/5B's smaller SMB footprint saves board space versus SMCJ18CA's larger SMC package, though at lower total surge energy handling.
Availability
SMB8J18CHE3/5B is available at Aetrix Electronics and suitable for automotive sensor modules, industrial PLC I/O cards, and telecom line interface designs requiring stable component supply, AEC-Q101 compliance, and high-volume SMT assembly support.
Supply support for SMB8J18CHE3/5B 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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMB8JxxCA series targets high-reliability transient suppression in harsh environments, particularly automotive and industrial applications demanding AEC-Q101 validation and robust surge immunity.
FAQ
What is the clamping voltage of SMB8J18CHE3/5B under maximum surge conditions?
The SMB8J18CHE3/5B has a maximum clamping voltage (VC) of 29.2 V at 27.4 A peak pulse current (IPPM) using the standard 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and ensures downstream components see limited overvoltage during transient events. The SMB8J18CHE3/5B maintains this clamping performance across its full operating temperature range of -55 °C to +150 °C.
Is SMB8J18CHE3/5B suitable for automotive applications?
Yes, SMB8J18CHE3/5B is AEC-Q101 qualified and carries the HE3 suffix, confirming compliance with automotive reliability testing including temperature cycling, high-temperature operating life, and mechanical shock. Its glass-passivated junction and MSL Level 1 rating further support use in engine control units, body electronics, and ADAS sensor modules. The SMB8J18CHE3/5B is explicitly listed in Vishay's AEC-Q101 qualified product portfolio.
What is the difference between SMB8J18CHE3/5B and SMBJ18CA?
SMB8J18CHE3/5B and SMBJ18CA share identical electrical specs (VWM = 18 V, VC = 29.2 V, PPPM = 800 W) and DO-214AA package, but SMB8J18CHE3/5B is AEC-Q101 qualified with HE3 suffix (JESD 201 Class 2 whisker resistance), whereas SMBJ18CA uses E3 suffix and lacks automotive qualification. The SMB8J18CHE3/5B is intended for automotive ECUs; SMBJ18CA is for commercial/industrial use only.
What PCB pad layout is recommended for SMB8J18CHE3/5B?
Vishay specifies a minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pad for each terminal of SMB8J18CHE3/5B to achieve rated thermal and surge performance. This layout supports RθJA = 72 °C/W and full 800 W PPPM capability. Smaller pads will increase thermal resistance and reduce surge current handling. The SMB8J18CHE3/5B datasheet Figure 2 provides derating curves for elevated ambient temperatures based on this pad size.
Does SMB8J18CHE3/5B have polarity markings?
No, SMB8J18CHE3/5B is a bi-directional TVS diode and carries no polarity marking on its DO-214AA (SMB) package. Unlike uni-directional variants (e.g., SMB8J18A), it lacks a cathode band because both terminals function identically under positive or negative transients. This simplifies PCB layout and eliminates orientation errors during automated placement of SMB8J18CHE3/5B.
SMB8J18CHE3/5B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- 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)
SMB8J18CHE3/5B FAQ
1.How can I place an order for SMB8J18CHE3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMB8J18CHE3/5B 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 SMB8J18CHE3/5B reliable?
The price and inventory of SMB8J18CHE3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMB8J18CHE3/5B is usually 5 days.
3.What payment methods are accepted for SMB8J18CHE3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMB8J18CHE3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMB8J18CHE3/5B?
SMB8J18CHE3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMB8J18CHE3/5B 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 SMB8J18CHE3/5B?
For technical support, including SMB8J18CHE3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMB8J18CHE3/5B requirements.
6.How does Aetrix verify that SMB8J18CHE3/5B is sourced from the original manufacturer or authorized distributors?
All SMB8J18CHE3/5B 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 SMB8J18CHE3/5B meets industry standards.
7.What is the process for return or replacement of SMB8J18CHE3/5B?
All SMB8J18CHE3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMB8J18CHE3/5B, 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 SMB8J18CHE3/5B part is unused and in its original packaging.
Return procedure for SMB8J18CHE3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMB8J18CHE3/5B Tags
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