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Taiwan Semiconductor Corporation SMBJ170CH
- Part No.:
- SMBJ170CH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ170CH.pdf
- Description:
- 600W, 210V, 10%, BIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:9,970
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Product details
Overview
SMBJ170CH from Taiwan Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode designed for high-energy ESD and surge protection in automotive and industrial power rails. It features a 170V working stand-off voltage (VWM), 600W peak pulse power rating (10/1000µs), clamping voltage of 304V at 2.0A peak impulse current, and AEC-Q101 qualification for under-hood automotive applications.
For engineers reviewing the SMBJ170CH datasheet, SMBJ170CH pinout, SMBJ170CH application, or SMBJ170CH equivalent, key selection criteria include unidirectional vs. bidirectional configuration (CH suffix = bidirectional), clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, junction temperature limits (–55°C to +150°C), and DO-214AA (SMB) package compatibility with automated SMT placement.
Technical Context
The SMBJ170CH operates as a bidirectional avalanche diode, symmetrically clamping transients above ±189V breakdown (VBR min) and below ±231V (VBR max) at 1mA test current. Its glass-passivated junction ensures stable leakage (<1µA at VWM) and fast response (<1.0ps), critical for protecting CAN, LIN, and sensor interfaces against electrical fast transients (EFT).
Thermally, it delivers RθJC = 10°C/W and RθJA = 55°C/W, enabling reliable operation up to 150°C junction temperature. It meets ISO 7637-2 immunity requirements for automotive electronics and complies with J-STD-020 moisture sensitivity level 1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 170 V - Maximum continuous DC or RMS voltage the device blocks without conduction |
| VBR (min/max) | 189 / 231 V @ 1 mA - Ensures predictable avalanche initiation across production lot and temperature |
| VC @ IPP | 304 V @ 2.0 A - Clamping voltage during 10/1000µs surge defines maximum stress on downstream ICs |
| PPK | 600 W - Peak pulse power handling capability per single 10/1000µs transient event |
| ID @ VWM | <1 µA - Ultra-low leakage preserves battery life and signal integrity in always-on circuits |
| Package | DO-214AA (SMB) - Standardized surface-mount outline compatible with IPC-7351B land patterns |
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 orientation per marking diagram).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (marked side) | Transient return path (bidirectional) | Provides symmetrical clamping to ground or rail in either polarity; no DC bias dependency |
| Cathode (band side) | Transient return path (bidirectional) | Same function as Anode terminal; terminals are electrically interchangeable in bidirectional operation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive under-hood use including thermal cycling, humidity, and mechanical shock |
| Glass passivated junction | Enhances long-term reliability and stability of VBR and leakage under high-temp/humidity stress |
| Fast response time <1.0 ps | Clamps ESD events before sensitive logic or analog circuitry sustains damage |
| Meets ISO 7637-2 Pulse 1/2a/2b/3a/3b | Protects vehicle ECUs against load dump, inductive switching, and battery disconnect transients |
| RoHS & halogen-free | Complies with IEC 61249-2-21 and EU RoHS Directive for environmentally constrained designs |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: 12V/24V battery-fed control modules exposed to load dump and alternator transients. IC Role / Device Role / Timing Role: Bidirectional TVS placed between power rail and ground to clamp surges exceeding ±170V. Use Value: Limits voltage seen by MCU power supply and CAN transceivers to ≤304V, preventing latch-up or permanent damage. | Use Scenario: Analog sensor inputs (e.g., pressure, temperature) connected to long harnesses in factory automation. IC Role / Device Role / Timing Role: TVS mounted at connector entry point to shunt EFT and lightning-induced surges. Use Value: Maintains signal integrity by suppressing transients before they couple into low-voltage op-amp front-ends. |
| LED Lighting Driver Protection | Automotive LIN Bus Protection |
Use Scenario: Constant-current LED drivers subjected to hot-swap and inductive kickback during dimming. IC Role / Device Role / Timing Role: Bidirectional clamping device across driver output to absorb reverse EMF. Use Value: Prevents overvoltage failure of MOSFET switches and gate drivers during rapid current transitions. | Use Scenario: LIN transceiver nodes in door modules or seat controls exposed to wiring harness coupling. IC Role / Device Role / Timing Role: Low-capacitance TVS placed across LIN bus lines (LIN-H/LIN-L) to suppress ESD and EFT. Use Value: Enables robust communication at 19.2 kbps without bit errors or bus lockup during 8kV contact discharge. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ170CA | Same VWM (170V), identical VBR range (189–231V), but lower clamping voltage (275V @ 2.2A) and higher IPP rating | Optimized for higher surge repetition rates due to improved thermal design; slightly tighter VBR tolerance | Select SMBJ170CA when lower clamping voltage and enhanced surge endurance are required in space-constrained layouts |
| P6SMB170CA | Same DO-214AA package and bidirectional configuration; VBR 189–231V, VC = 275V @ 2.2A, but rated for 600W only at 25°C (derates faster above TA) | Lacks AEC-Q101 qualification and ISO 7637-2 compliance documentation; intended for commercial-grade systems | Choose P6SMB170CA for cost-sensitive non-automotive applications where full automotive qualification is not mandated |
Compared with SMBJ170CH, SMBJ170CA offers lower clamping and better surge endurance, while P6SMB170CA provides equivalent electrical specs at lower qualification grade-making SMBJ170CH the preferred choice for AEC-Q101-compliant automotive designs requiring documented ISO 7637-2 immunity.
Availability
SMBJ170CH is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, LED lighting drivers, and LIN bus nodes requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for SMBJ170CH 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, rectifiers, and MOSFETs with global distribution and AEC-Q101 validation capabilities.
The SMBJH series was developed specifically for high-reliability automotive and industrial transient suppression, emphasizing robust clamping, low leakage, and standardized SMB packaging for automated manufacturing.
FAQ
What does the "CH" suffix indicate in SMBJ170CH?
The "CH" suffix in SMBJ170CH denotes a bidirectional configuration with cathode-band marking, meaning the device clamps symmetrically for both positive and negative transients. Unlike unidirectional variants (e.g., SMBJ170H), SMBJ170CH has no polarity-dependent function-both terminals serve as interchangeable surge return paths. This makes SMBJ170CH ideal for differential line protection such as LIN or isolated sensor interfaces where voltage reversals occur.
Is SMBJ170CH AEC-Q101 qualified?
Yes, SMBJ170CH is explicitly AEC-Q101 qualified per the manufacturer's datasheet (Version A2102). This qualification covers stress tests including high-temperature operating life, temperature cycling, humidity bias HAST, and mechanical shock-ensuring suitability for automotive under-hood applications. The qualification applies directly to the SMBJ170CH part number, not just the SMBJH family generically.
What is the maximum clamping voltage for SMBJ170CH and under what test condition?
The maximum clamping voltage for SMBJ170CH is 304 V, measured at a peak impulse current (IPP) of 2.0 A using the standard 10/1000 µs double-exponential surge waveform. This value is guaranteed across the full operating temperature range and represents the upper limit of voltage imposed on protected circuitry during worst-case transient events.
Does SMBJ170CH meet ISO 7637-2 immunity standards?
Yes, SMBJ170CH is specified to meet ISO 7637-2 for Pulse 1 (inductive load disconnect), Pulse 2a (sudden load removal), Pulse 2b (supply line inductive spike), Pulse 3a (capacitive coupled EFT), and Pulse 3b (power line EFT). Compliance is confirmed in the "FEATURES" section of the official datasheet and validated through system-level testing per the standard's test setup and waveform definitions.
What is the junction-to-case thermal resistance (RθJC) of SMBJ170CH?
The junction-to-case thermal resistance (RθJC) of SMBJ170CH is 10°C/W, as published in the Thermal Performance table of the datasheet. This parameter enables accurate calculation of junction temperature rise above the PCB pad temperature and supports thermal design for high-duty-cycle surge environments, especially when used in conjunction with recommended copper pour areas per the DO-214AA pad layout guidelines.
SMBJ170CH 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):
- 170V
- Voltage - Breakdown (Min):
- 189V
- Voltage - Clamping (Max) @ Ipp:
- 304V
- Current - Peak Pulse (10/1000µs):
- 2A
- 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)
SMBJ170CH FAQ
1.How can I place an order for SMBJ170CH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ170CH 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 SMBJ170CH reliable?
The price and inventory of SMBJ170CH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ170CH is usually 5 days.
3.What payment methods are accepted for SMBJ170CH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ170CH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ170CH?
SMBJ170CH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ170CH 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 SMBJ170CH?
For technical support, including SMBJ170CH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ170CH requirements.
6.How does Aetrix verify that SMBJ170CH is sourced from the original manufacturer or authorized distributors?
All SMBJ170CH 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 SMBJ170CH meets industry standards.
7.What is the process for return or replacement of SMBJ170CH?
All SMBJ170CH units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ170CH, 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 SMBJ170CH part is unused and in its original packaging.
Return procedure for SMBJ170CH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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