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Taiwan Semiconductor Corporation SMBJ170
- Part No.:
- SMBJ170
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ170.pdf
- Description:
- 600W, 210V, 10%, UNIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:5,580
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Product details
Overview
SMBJ170 from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for high-energy surge protection in DC power lines and signal interfaces. It features a 170 V working stand-off voltage (VWM), 231 V maximum breakdown voltage (VBR), 304 V clamping voltage at 2.0 A peak impulse current (IPP), and 600 W peak pulse power rating with sub-1 ps response time - deployed in automotive power supply rails, industrial I/O modules, and PoE-powered equipment.
For engineers reviewing the SMBJ170 datasheet, SMBJ170 pinout, SMBJ170 application, or SMBJ170 equivalent, key selection criteria include its DO-214AA (SMB) package compatibility, unidirectional polarity marking, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, and thermal derating behavior above 25°C ambient - all critical for robust ESD and load-dump protection design.
Technical Context
The SMBJ170 operates as a silicon avalanche diode with glass-passivated junction, enabling fast clamping (<1.0 ps typical response) and low leakage (<1 µA at VWM). Its unidirectional configuration provides forward conduction only during reverse overvoltage events, with VF = 5.0 V at 50 A surge current per specification.
Thermally, it exhibits RθJC = 10 °C/W and RθJA = 55 °C/W, supporting continuous operation up to TJ = +150 °C. The device meets JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity requirements for automated SMT assembly.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 170 V - Maximum continuous DC or RMS voltage the device blocks without clamping; defines operating margin before transient activation. |
| VBR (min/max) | 189 V / 231 V @ 1 mA - Breakdown threshold range; ensures reliable turn-on across process variation and temperature. |
| VC @ IPP | 304 V @ 2.0 A (10/1000 µs waveform) - Clamped voltage seen by protected circuit during worst-case surge; determines downstream component stress. |
| PPK | 600 W - Peak non-repetitive surge power handling; supports automotive load-dump and ISO 7637-2 Pulse 5a events. |
| IFSM | 100 A - Single half-sine surge current rating (8.3 ms); validates robustness against inductive switching transients. |
| TJ max | +150 °C - Maximum junction temperature; enables use in under-hood automotive or enclosed industrial enclosures. |
Pinout & Package
Package: DO-214AA (SMB), surface-mount, single-diode unidirectional configuration with cathode band marking. Case meets UL 94V-0 flammability rating; matte tin-plated leads comply with J-STD-002 solderability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Surge return path | Connected to system ground or low-side reference; completes clamping loop during reverse overvoltage. |
| Cathode | Protected line connection / Surge input | Connected to line being protected (e.g., 24 V rail); avalanche conduction occurs when cathode-to-anode voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| Sub-1 ps response time | Enables suppression of fast ESD and EFT transients before sensitive ICs experience latch-up or damage. |
| ISO 7637-2 compliance (Pulse 1/2a/2b/3a/3b) | Validates suitability for automotive 12 V/24 V power networks against real-world conducted surges. |
| Junction capacitance <100 pF @ 0 V | Minimizes signal distortion on data lines (e.g., CAN, RS-485) when used in bidirectional configurations with CA suffix variants. |
| Moisture sensitivity Level 1 (J-STD-020) | Eliminates bake-out requirement prior to reflow, reducing manufacturing cost and cycle time. |
Applications
| Automotive Power Rail Protection | Industrial PLC Digital I/O Protection |
|---|---|
Use Scenario: 24 V battery-fed control module exposed to load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and ground to clamp transients exceeding 170 V. Use Value: Limits voltage seen by MCU power supply and CAN transceivers to ≤304 V, preventing permanent damage per ISO 7637-2 Pulse 5a test profile. |
Use Scenario: 24 V digital input channel receiving signals from field sensors subject to inductive kickback. IC Role / Device Role / Timing Role: Standoff protector on input terminal block, shunting surge energy to chassis ground. Use Value: Withstands 100 A 8.3 ms half-sine surge (IFSM) while maintaining <1 µA leakage at 170 V, ensuring no false triggering during normal operation. |
| LED Driver Overvoltage Clamp | Power over Ethernet (PoE) Midspan Protection |
Use Scenario: Constant-current LED driver board powered from 48 V DC supply in outdoor lighting. IC Role / Device Role / Timing Role: Primary surge clamp on input stage, upstream of DC-DC converter. Use Value: 600 W peak power rating absorbs lightning-induced surges on long cable runs without thermal runaway, validated to UL 94V-0 housing. |
Use Scenario: Midspan PoE injector protecting 48 V PSE output against cable discharge events. IC Role / Device Role / Timing Role: Unidirectional TVS on each power pair (spare pairs or data pairs with isolation). Use Value: Sub-1 ps response ensures clamping before IEEE 802.3af/at transient energy couples into PD interface, preserving PHY integrity. |
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 SMAJ170A | Same VWM (170 V), lower VC (275 V @ 2.2 A), slightly higher IPP rating (2.2 A vs. 2.0 A). | Bidirectional variant available (SMAJ170CA); SMBJ170 is unidirectional only. | Select SMAJ170A if tighter clamping or bidirectional capability is required; verify layout compatibility with SMA package (slightly smaller than SMB). |
| ON Semiconductor 1.5SMC170A | Same VWM/VBR range, identical DO-214AB (SMC) package - larger footprint than DO-214AA (SMB). | Higher PPK (1500 W) but same 600 W rating at 10/1000 µs; different thermal derating curve. | Choose 1.5SMC170A only if board space allows SMC package and higher peak power margin is needed; not drop-in due to footprint mismatch. |
Compared with SMBJ170, SMAJ170A offers improved clamping performance in same-voltage class but requires SMA footprint validation, while 1.5SMC170A delivers higher surge capacity at the cost of larger PCB area and different thermal management - neither is pin-compatible, but both serve overlapping protection roles in industrial and automotive systems.
Availability
SMBJ170 is available at Aetrix Electronics and suitable for automotive power rail protection, industrial PLC digital I/O protection, and LED driver overvoltage clamp applications requiring stable component supply, full traceability, and lifecycle continuity.
Supply support for SMBJ170 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 - headquartered in Hsinchu Science Park, Taiwan.
The SMBJ series was developed for high-reliability, surface-mount surge protection in automotive and industrial environments, emphasizing fast response, ISO 7637-2 compliance, and automated assembly readiness.
FAQ
What is the polarity configuration of SMBJ170?
The SMBJ170 is a unidirectional TVS diode, with cathode band marking indicating the protected line connection point. It conducts only during reverse-biased overvoltage events - forward voltage is 5.0 V at 50 A per specification. This configuration is distinct from bidirectional variants (e.g., SMBJ170CA), which require C or CA suffixes and exhibit symmetrical clamping in both directions.
Does SMBJ170 meet automotive surge immunity standards?
Yes, SMBJ170 meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements for conducted transient immunity in 12 V and 24 V vehicle electrical systems. Its 600 W peak pulse power rating, 100 A IFSM, and 304 V clamping voltage at 2.0 A ensure robust protection against load dump, jump start, and inductive switching events defined in the standard.
What is the maximum allowable junction temperature for SMBJ170?
The SMBJ170 has a maximum junction temperature (TJ) of +150 °C, verified per absolute maximum ratings. This enables deployment in high-ambient environments such as engine compartments or sealed industrial enclosures. Thermal design must account for RθJA = 55 °C/W and RθJC = 10 °C/W to avoid exceeding this limit under sustained surge duty cycles.
How does SMBJ170 differ from SMBJ170A?
SMBJ170 specifies a VBR range of 189–231 V and clamps at 304 V @ 2.0 A, while SMBJ170A has tighter VBR (189–209 V) and lower clamping voltage (275 V @ 2.2 A). Both share 170 V VWM and DO-214AA package, but SMBJ170A offers improved consistency and margin for precision-clamp designs where lower VC is critical.
Is SMBJ170 RoHS and halogen-free compliant?
Yes, SMBJ170 is RoHS compliant and halogen-free per IEC 61249-2-21. The molding compound meets UL 94V-0 flammability rating, and matte tin-plated leads satisfy J-STD-002 solderability requirements. Moisture sensitivity is rated Level 1 per J-STD-020, eliminating pre-reflow baking needs in standard SMT processes.
SMBJ170 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:
- 1
- Bidirectional Channels:
- -
- 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)
SMBJ170 FAQ
1.How can I place an order for SMBJ170 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ170 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 SMBJ170 reliable?
The price and inventory of SMBJ170 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ170 is usually 5 days.
3.What payment methods are accepted for SMBJ170?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ170 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ170?
SMBJ170 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ170 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 SMBJ170?
For technical support, including SMBJ170 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ170 requirements.
6.How does Aetrix verify that SMBJ170 is sourced from the original manufacturer or authorized distributors?
All SMBJ170 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 SMBJ170 meets industry standards.
7.What is the process for return or replacement of SMBJ170?
All SMBJ170 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ170, 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 SMBJ170 part is unused and in its original packaging.
Return procedure for SMBJ170:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ170 Tags
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