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Taiwan Semiconductor Corporation SMBJ18CH
- Part No.:
- SMBJ18CH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ18CH.pdf
- Description:
- 600W, 22.2V, 10%, BIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:7,113
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Product details
Overview
SMBJ18CH from Taiwan Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, designed for high-energy ESD and surge protection in automotive and industrial power rails. It features a 18 V working stand-off voltage (VWM), 20.0–24.4 V breakdown voltage (VBR), 32.2 V maximum clamping voltage (VC) at 19.5 A peak pulse current, and 600 W peak pulse power rating with sub-1 ps response time.
For engineers reviewing the SMBJ18CH datasheet, SMBJ18CH pinout, SMBJ18CH application, or SMBJ18CH equivalent, key selection criteria include unidirectional vs. bidirectional configuration (CH suffix = bidirectional), clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, leakage current ≤1 µA at 18 V, and AEC-Q101 qualification for automotive-grade reliability.
Technical Context
The SMBJ18CH operates as a silicon avalanche diode with glass-passivated junction, enabling fast transient suppression without degradation under repeated surges. Its bidirectional architecture allows symmetrical clamping in AC-coupled or floating signal lines, eliminating polarity concerns during layout.
Thermal design is supported by RθJC = 10 °C/W and RθJA = 55 °C/W, with junction temperature rated from –55 °C to +150 °C. It meets JESD201 Class 2 whisker resistance and J-STD-020 Moisture Sensitivity Level 1, ensuring robustness in automated SMT assembly and harsh environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC rail margin. |
| VBR min / max | 20.0 / 24.4 V - Breakdown occurs within this range at 1 mA test current; ensures predictable turn-on threshold. |
| VC @ IPP | 32.2 V at 19.5 A - Clamped voltage during 10/1000 µs surge; limits downstream IC stress to safe levels. |
| PPK | 600 W - Peak pulse power handling per single 10/1000 µs transient; supports ISO 7637-2 compliance. |
| ID @ VWM | ≤1 µA - Low leakage preserves battery life and signal integrity in always-on circuits. |
| Response time | <1.0 ps - Enables suppression of ultrafast ESD events (IEC 61000-4-2) before damage occurs. |
| Package | DO-214AA (SMB) - Standard surface-mount outline with 0.090 g mass; compatible with JEDEC MS-013 and IPC-7351B footprints. |
Pinout & Package
DO-214AA (SMB) package: molded plastic case with matte tin-plated leads, polarity indicated by cathode band (bidirectional symmetry means no functional anode/cathode distinction; band denotes terminal 1 per standard SMB marking convention).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode/Cathode (bidirectional) | Either terminal serves as clamping node; symmetric I-V curve enables placement without orientation constraints. |
| Terminal 2 | Anode/Cathode (bidirectional) | Paired terminal forms differential or common-mode clamp path; no internal polarity dependency. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements including HTOL, TCT, and ESD HBM/MM, enabling use in engine control, body electronics, and ADAS modules. |
| Glass passivated junction | Enhances long-term reliability and stability under thermal cycling and humidity exposure, reducing parameter drift over lifetime. |
| ISO 7637-2 compliance | Withstands Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling), meeting OEM-level EMC requirements. |
| Moisture sensitivity level 1 | Zero bake requirement prior to reflow; supports standard SMT processes without moisture-related popcorning risk. |
| RoHS & halogen-free | Complies with IEC 61249-2-21 and EU RoHS Directive 2011/65/EU, enabling use in green manufacturing and export-sensitive applications. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs against load dump and alternator transients in passenger vehicles. IC Role / Device Role / Timing Role: Bidirectional TVS placed across power input to clamp both positive and negative spikes without polarity constraints. Use Value: Limits voltage to ≤32.2 V during 19.5 A surges, preventing damage to MCU, CAN transceivers, and voltage regulators per ISO 7637-2 Pulse 5a. |
Use Scenario: Safeguarding 4–20 mA current-loop sensors in factory automation against EFT and lightning-induced surges. IC Role / Device Role / Timing Role: Common-mode clamp between signal line and ground, leveraging bidirectional symmetry for AC-coupled analog inputs. Use Value: Sub-1 ps response captures fast transients before op-amp input stages saturate, preserving measurement accuracy and avoiding latch-up. |
| LED Lighting Driver Protection | USB-C Port ESD Suppression |
Use Scenario: Shielding constant-current LED drivers from inductive switching noise generated by MOSFETs or relays. IC Role / Device Role / Timing Role: Parallel-connected TVS across driver output to absorb flyback energy and prevent overvoltage on LED strings. Use Value: 600 W peak power rating handles repetitive 10/1000 µs transients from nearby relay coils without degradation. |
Use Scenario: Providing IEC 61000-4-2 Level 4 (±15 kV air, ±8 kV contact) ESD protection on USB-C CC and VBUS lines. IC Role / Device Role / Timing Role: Low-capacitance bidirectional clamp (typ. <100 pF at 0 V) placed directly at connector to minimize stub length. Use Value: Clamps ESD pulses to <33 V within picoseconds, protecting USB PD controllers and Type-C multiplexers without signal distortion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ18CA | Same DO-214AC (SMA) package; slightly higher VC = 33.2 V at 18.3 A; lower PPK = 400 W. | Lower power rating limits suitability for ISO 7637-2 Pulse 5a; better fit for cost-sensitive consumer-grade designs. | Select SMAJ18CA only if system-level surge testing confirms 400 W sufficiency and SMA footprint is preferred. |
| Vishay SMF18A | DO-219AB (SOD-123FL) package; unidirectional; VC = 29.2 V at 20.9 A; PPK = 200 W. | Unidirectional operation requires correct polarity placement; insufficient for bidirectional AC or floating bus protection. | Use SMF18A only for low-energy, polarity-defined DC rails where space constraints favor SOD-123FL and 200 W rating is adequate. |
Compared with SMBJ18CH, SMAJ18CA offers reduced surge capacity but broader distributor availability, while SMF18A trades bidirectionality and power rating for ultra-compact size-making SMBJ18CH the optimal choice for AEC-Q101-compliant, high-energy, polarity-agnostic protection.
Availability
SMBJ18CH is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, LED lighting systems, and USB-C port protection requiring stable component supply and full AEC-Q101 traceability.
Supply support for SMBJ18CH 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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated semiconductor manufacturer specializing in discrete power devices, TVS diodes, and rectifiers, with global distribution and AEC-Q101 certification capabilities.
The SMBJH series was developed specifically for automotive and industrial transient suppression, emphasizing high PPK, low clamping voltage, and process consistency across voltage grades from 5 V to 170 V.
FAQ
What does the "CH" suffix indicate in SMBJ18CH?
The "CH" suffix in SMBJ18CH denotes a bidirectional configuration, meaning the device provides symmetrical clamping in both polarities-ideal for AC lines, floating buses, or applications where voltage polarity reversal may occur. Unlike unidirectional variants (e.g., SMBJ18H), SMBJ18CH has no designated anode or cathode and functions identically regardless of terminal orientation.
Is SMBJ18CH qualified for automotive use?
Yes, SMBJ18CH is AEC-Q101 qualified, having passed stress tests including high-temperature operating life (HTOL), temperature cycling (TCT), and human-body-model (HBM) ESD. This qualification validates its reliability in automotive powertrain, chassis, and infotainment systems where sustained operation at –40 °C to +125 °C ambient is required.
What is the maximum clamping voltage of SMBJ18CH under surge conditions?
The maximum clamping voltage (VC) of SMBJ18CH is 32.2 V when subjected to a 10/1000 µs surge waveform with a peak current (IPP) of 19.5 A. This value is guaranteed per the datasheet's Electrical Specifications table and ensures downstream components remain below critical overvoltage thresholds during standardized transients like ISO 7637-2 Pulse 1.
How does SMBJ18CH compare to SMBJ18H in circuit design?
SMBJ18CH is bidirectional, while SMBJ18H is unidirectional. In practice, SMBJ18CH eliminates polarity-checking during PCB layout and supports AC-coupled or floating nodes, whereas SMBJ18H must be oriented correctly to protect only the intended polarity. Both share identical VWM (18 V), VBR (20.0–24.4 V), and PPK (600 W), but SMBJ18CH's symmetry simplifies design reuse across dual-polarity systems.
Does SMBJ18CH meet RoHS and halogen-free standards?
Yes, SMBJ18CH complies with EU RoHS Directive 2011/65/EU and is halogen-free per IEC 61249-2-21. The molding compound is UL 94V-0 rated, and terminals are matte tin-plated per J-STD-002, supporting lead-free reflow soldering and environmentally compliant manufacturing.
SMBJ18CH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AA, SMB
- Series:
- SMBJH
- 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:
- 32.2V
- Current - Peak Pulse (10/1000µs):
- 19.5A
- Power - Peak Pulse:
- 600W
- 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)
SMBJ18CH FAQ
1.How can I place an order for SMBJ18CH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ18CH 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 SMBJ18CH reliable?
The price and inventory of SMBJ18CH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ18CH is usually 5 days.
3.What payment methods are accepted for SMBJ18CH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ18CH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ18CH?
SMBJ18CH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ18CH 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 SMBJ18CH?
For technical support, including SMBJ18CH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ18CH requirements.
6.How does Aetrix verify that SMBJ18CH is sourced from the original manufacturer or authorized distributors?
All SMBJ18CH 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 SMBJ18CH meets industry standards.
7.What is the process for return or replacement of SMBJ18CH?
All SMBJ18CH units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ18CH, 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 SMBJ18CH part is unused and in its original packaging.
Return procedure for SMBJ18CH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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