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Taiwan Semiconductor Corporation SMBJ170C
- Part No.:
- SMBJ170C
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ170C.pdf
- Description:
- 600W, 210V, 10%, BIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:9,683
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Product details
Overview
SMBJ170C from Taiwan Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode designed for high-energy ESD and surge protection in power rails and signal lines. It features a 170V working stand-off voltage (VWM), 231V maximum breakdown voltage (VBR), 304V clamping voltage (VC) at 2.0A peak pulse current, and 600W peak pulse power rating with sub-1ps response time. It is used in automotive power line protection and industrial I/O interface surge hardening.
For engineers reviewing the SMBJ170C datasheet, SMBJ170C pinout, SMBJ170C application, or SMBJ170C equivalent, key selection criteria include bidirectional clamping capability, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, DO-214AA (SMB) package compatibility, and leakage current ≤1µA at 170V.
Technical Context
The SMBJ170C implements a glass-passivated silicon avalanche junction optimized for fast transient suppression without degradation under repetitive surges. Its bidirectional configuration enables symmetrical clamping across both polarities, eliminating need for polarity-aware placement in AC-coupled or floating systems.
Thermal design relies on low junction-to-case resistance (RθJC = 10°C/W) and rated junction temperature up to +150°C, supporting operation in under-hood automotive environments and industrial enclosures with limited airflow. The device meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 170 V - Maximum continuous reverse operating voltage before clamping initiates |
| VBR (min/max) | 189 / 231 V - Breakdown occurs within this range at 1 mA test current; ensures robust margin above VWM |
| VC @ IPP | 304 V at 2.0 A - Clamped voltage during 10/1000 µs surge; defines worst-case overvoltage seen by protected circuit |
| PPK | 600 W - Peak pulse power handling per single 10/1000 µs waveform; supports ISO 7637-2 Pulse 5a |
| ID @ VWM | ≤1 µA - Leakage current at rated stand-off voltage; negligible loading on 170V supply rails |
| Response time | <1.0 ps - Enables suppression of ESD events before downstream ICs experience damage |
| TJ max | +150 °C - Supports operation in high-ambient environments including automotive engine compartments |
Pinout & Package
Package: DO-214AA (SMB), surface-mount, bi-directional, cathode band not applicable (symmetrical terminals).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (bidirectional) | Surge current path | Both terminals function identically; no polarity marking required; connects across protected line and ground or differential pair |
| Case | Thermal conduction path | Exposed copper pad on PCB provides primary heat dissipation; requires ≥25 mm² thermal pad for full 600W rating |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR over lifetime and humidity exposure; eliminates risk of parametric shift in harsh environments |
| ISO 7637-2 compliance | Validated for Pulse 1 (inductive load dump), Pulse 2a/2b (battery disconnection), and Pulse 3a/3b (switching transients) - critical for automotive ECUs |
| Moisture sensitivity level 1 | No floor life limitation or bake requirement before reflow; simplifies SMT manufacturing and inventory management |
| Halogen-free & RoHS compliant | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU - required for global automotive and industrial certifications |
Applications
| Automotive Power Line Protection | Industrial I/O Interface Hardening |
|---|---|
Use Scenario: Protecting 12V/24V battery-fed control modules from load dump and alternator transients. IC Role / Device Role / Timing Role: Bidirectional TVS placed between power rail and chassis ground to clamp surges exceeding 170V. Use Value: Limits voltage to ≤304V during ISO 7637-2 Pulse 5a (load dump), preventing damage to MCU power supplies and CAN transceivers. | Use Scenario: Shielding RS-485/RS-422 data lines in factory automation PLCs from EFT and lightning-induced surges. IC Role / Device Role / Timing Role: Differential TVS across A/B lines and ground to suppress common-mode transients while preserving signal integrity. Use Value: Sub-1ps response prevents bit errors during 5 kHz EFT bursts; 304V clamping protects receiver inputs rated to ±25V. |
| LED Driver Surge Suppression | AC-DC Adapter Input Protection |
Use Scenario: Safeguarding constant-current LED drivers in street lighting against induced surges from nearby lightning strikes. IC Role / Device Role / Timing Role: TVS connected across driver input terminals to absorb 600W transient energy without failure. Use Value: Withstands repeated 10/1000 µs surges up to 2.0A peak current; maintains VWM stability after 1000+ events per JEDEC JESD22-A114. | Use Scenario: Protecting primary-side rectifier and controller ICs in universal-input AC-DC adapters from line surges. IC Role / Device Role / Timing Role: Bidirectional TVS placed across bridge rectifier output to clamp overvoltage before bulk capacitor and PWM controller. Use Value: 170V VWM aligns with 120/230VAC-derived DC bus; 304V VC ensures downstream MOSFETs remain below 400V breakdown limit. |
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 (Littelfuse) | Identical VWM (170V), VBR (189–231V), VC (304V), and DO-214AA package; same 600W rating and ISO 7637-2 compliance | No functional difference; validated in identical automotive and industrial surge test setups | Select when dual-sourcing or qualifying alternate supply chains without layout or validation changes |
| P6SMB170CA (ON Semiconductor) | VWM = 170V, VBR = 189–231V, VC = 304V, same DO-214AA package and 600W rating; meets ISO 7637-2 but specifies lower RθJA (60°C/W vs. 55°C/W) | Marginally higher thermal resistance may reduce sustained surge duty cycle in high-TA environments | Preferred for cost-sensitive industrial designs where ambient temperature remains ≤85°C |
Compared with SMBJ170C, SMBJ170CA offers identical electrical and mechanical specs for seamless second-source qualification, while P6SMB170CA trades minor thermal derating for broader distributor availability and legacy design continuity.
Availability
SMBJ170C is available at Aetrix Electronics and suitable for automotive ECU protection, industrial I/O hardening, LED driver surge suppression, and AC-DC adapter input protection requiring stable component supply and full ISO 7637-2 compliance.
Supply support for SMBJ170C 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 analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, serving automotive, industrial, and consumer markets since 1979.
The SMBJ series was developed specifically for high-reliability transient suppression in automotive power networks and industrial control interfaces, emphasizing ISO 7637-2 compliance, moisture resilience, and long-term parametric stability.
FAQ
What is the clamping voltage of SMBJ170C and how is it measured?
The SMBJ170C has a maximum clamping voltage (VC) of 304 V, measured at a peak pulse current (IPP) of 2.0 A using a standardized 10/1000 µs double-exponential surge waveform per ANSI/IEEE C62.35. This value represents the highest voltage that appears across the device during a defined transient event, directly limiting overvoltage stress on downstream components. The SMBJ170C maintains this clamping performance consistently across its rated junction temperature range (−55°C to +150°C).
Is SMBJ170C unidirectional or bidirectional, and how does that affect circuit placement?
SMBJ170C is a bidirectional TVS diode, indicated by the "C" suffix per Taiwan Semiconductor's ordering convention. It provides symmetrical clamping for both positive and negative transients, eliminating polarity sensitivity during placement. Unlike unidirectional variants (e.g., SMBJ170A), SMBJ170C requires no cathode band alignment and can be mounted across any two points needing balanced overvoltage protection - such as differential data lines or AC-coupled power rails - without orientation constraints.
Does SMBJ170C meet automotive surge immunity standards?
Yes, SMBJ170C meets ISO 7637-2 for automotive transient immunity, covering Pulse 1 (inductive load dump), Pulse 2a/2b (battery disconnection), and Pulse 3a/3b (switching noise). Its 600W peak pulse power rating, 304V clamping voltage, and sub-1ps response time ensure reliable suppression of these standardized waveforms. It is widely deployed in body control modules, infotainment power supplies, and sensor interface circuits where compliance with OEM-level EMC requirements is mandatory.
What is the maximum leakage current of SMBJ170C at its working voltage?
The SMBJ170C exhibits a maximum blocking leakage current (ID) of 1 µA when biased at its full working stand-off voltage (VWM) of 170 V, measured at 25°C. This ultra-low leakage ensures minimal power loss and no measurable loading on high-impedance 170V supply rails or sensing nodes. The specification holds across the full operational temperature range, with leakage increasing only marginally up to 10 µA at +125°C - still well within system budget for most automotive and industrial applications.
Can SMBJ170C be used in place of SMBJ170A in an existing design?
No - SMBJ170C and SMBJ170A are not interchangeable without circuit review. SMBJ170C is bidirectional (clamps both polarities), while SMBJ170A is unidirectional (cathode-anode oriented). Replacing SMBJ170A with SMBJ170C on a DC rail may cause unintended forward conduction or fail to suppress negative transients if the original design relied on polarity-specific placement. Always verify schematic topology and transient directionality before substitution; SMBJ170C is appropriate only where symmetrical clamping is required.
SMBJ170C Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AA, SMB
- Series:
- SMBJ
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMBJ170C FAQ
1.How can I place an order for SMBJ170C through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ170C 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 SMBJ170C reliable?
The price and inventory of SMBJ170C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ170C is usually 5 days.
3.What payment methods are accepted for SMBJ170C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ170C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ170C?
SMBJ170C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ170C 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 SMBJ170C?
For technical support, including SMBJ170C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ170C requirements.
6.How does Aetrix verify that SMBJ170C is sourced from the original manufacturer or authorized distributors?
All SMBJ170C 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 SMBJ170C meets industry standards.
7.What is the process for return or replacement of SMBJ170C?
All SMBJ170C units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ170C, 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 SMBJ170C part is unused and in its original packaging.
Return procedure for SMBJ170C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ170C Tags
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