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Taiwan Semiconductor Corporation SMBJ170CA
- Part No.:
- SMBJ170CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ170CA.pdf
- Description:
- TVS DIODE 170VWM 275VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,000
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Product details
Overview
SMBJ170CA from Taiwan Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, designed for high-energy surge protection in automotive and industrial power rails. It features a 170 V working stand-off voltage (VWM), 275 V maximum clamping voltage (VC@IPP) at 2.2 A peak impulse current, and 600 W peak pulse power rating with sub-1 ps response time.
For engineers reviewing the SMBJ170CA datasheet, SMBJ170CA pinout, SMBJ170CA application, or SMBJ170CA equivalent, this device is selected for robust ESD and ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance in 12 V/24 V/48 V DC systems where low leakage (<1 µA @ VWM), stable breakdown (189–209 V), and UL 94V-0 molding compound are critical.
Technical Context
The SMBJ170CA implements a symmetric, bidirectional avalanche junction structure optimized for fast clamping of both positive and negative transients without polarity dependency. Its glass-passivated die ensures stable VBR over temperature and long-term reliability under repetitive surge stress.
Designed to meet ISO 7637-2 immunity requirements, it delivers consistent clamping performance across -55°C to +150°C junction temperature range, with thermal resistance RθJA = 55°C/W enabling effective heat dissipation in compact PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 170 V - Maximum continuous reverse operating voltage before clamping initiates |
| VBR min/max | 189 / 209 V @ 1 mA - Confirmed breakdown threshold ensuring reliable turn-on margin above VWM |
| VC@IPP | 275 V @ 2.2 A - Clamped voltage during 10/1000 µs surge, limiting downstream IC stress |
| PPK | 600 W - Peak pulse power handling per single 10/1000 µs waveform, derated above 25°C |
| ID@VWM | <1 µA - Ultra-low leakage preserves system standby current in battery-powered applications |
| TJ max | +150°C - Enables operation in under-hood automotive or industrial enclosures |
| Package | DO-214AA (SMB) - Surface-mount footprint compatible with automated assembly and IPC-7351B land patterns |
Pinout & Package
DO-214AA (SMB) package: surface-mount, molded plastic case with cathode band marking; terminals are matte tin-plated leads, solderable per J-STD-002; polarity marked on body for bidirectional orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Transient return path (bidirectional) | Connects to protected line; conducts during negative surges relative to cathode |
| Cathode (banded end) | Transient return path (bidirectional) | Connects to protected line; conducts during positive surges relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR and VC performance in both polarities eliminates need for polarity-aware placement |
| ISO 7637-2 compliance | Validated against Pulse 1 (inductive load dump), Pulse 2a/2b (battery disconnect), and Pulse 3a/3b (switching transients) |
| Glass-passivated junction | Ensures stable VBR drift <±5% over 1000 hrs HTOL testing at 125°C |
| Moisture sensitivity level 1 | No floor life limitation or bake requirement prior to reflow, reducing manufacturing overhead |
| UL 94V-0 molding compound | Self-extinguishing encapsulant meets flame-retardancy requirements for automotive ECUs and industrial controllers |
Applications
| Automotive Power Rail Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting 24 V CAN bus power supply and microcontroller VDD rail from load dump and jump-start transients. IC Role / Device Role / Timing Role: Primary clamping element placed at board-level input filter stage, upstream of DC-DC converters. Use Value: Limits voltage excursion to ≤275 V during 10/1000 µs 100 V surge, preventing latch-up or gate oxide damage in downstream PMICs. | Use Scenario: Safeguarding analog input channels (4–20 mA, 0–10 V) in programmable logic controllers exposed to field wiring transients. IC Role / Device Role / Timing Role: Bidirectional shunt protector across signal and reference lines, absorbing EFT bursts per IEC 61000-4-4. Use Value: Maintains signal integrity by clamping fast transients within 1 ps, with <1 µA leakage preserving measurement accuracy. |
| LED Driver Surge Suppression | Telecom Power Interface |
Use Scenario: Shielding constant-current LED drivers in streetlight systems from lightning-induced surges on AC/DC front-end inputs. IC Role / Device Role / Timing Role: Secondary-level TVS placed after bulk capacitor but before primary-side controller IC. Use Value: Absorbs 600 W peak energy without degradation, enabling compliance with IEC 61000-4-5 Level 3 (2 kV line-earth). | Use Scenario: Protecting PoE-powered equipment (e.g., IP cameras) from induced surges on 48 V DC input derived from Ethernet cables. IC Role / Device Role / Timing Role: Bidirectional clamp across DC input rails, coordinated with common-mode chokes and Y-capacitors. Use Value: Withstands repeated 10/1000 µs pulses up to 2.2 A while maintaining VWM = 170 V, matching typical PoE+ hold-up voltage margins. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMCJ170CA | Same VWM/VBR/VC specs but in larger DO-214AB (SMC) package; 1500 W PPK rating | Higher power handling suits higher-energy surge environments (e.g., railway traction control) | Select when >600 W single-pulse energy or lower thermal resistance (RθJA = 35°C/W) is required |
| P6SMB170CA | Identical DO-214AA package and electrical specs; manufactured by ON Semiconductor | No functional or layout difference; qualified for same automotive and industrial standards | Preferred for dual-sourcing or when ON Semi's qualification documentation is mandated |
Compared with SMBJ170CA, SMCJ170CA offers higher surge capacity in a larger footprint, while P6SMB170CA provides second-source availability with identical pinout, parameters, and qualification-enabling drop-in replacement without layout change.
Availability
SMBJ170CA is available at Aetrix Electronics and suitable for automotive infotainment power supplies, industrial sensor node protection, and telecom DC interface circuits requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for SMBJ170CA 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, specializing in TVS diodes, rectifiers, and MOSFETs for automotive and industrial markets.
The SMBJ series was developed specifically for high-reliability transient suppression in harsh-environment applications, emphasizing low clamping ratio, tight VBR tolerance, and full ISO 7637-2 compliance out-of-the-box.
FAQ
What is the maximum clamping voltage of SMBJ170CA at its rated peak impulse current?
The SMBJ170CA has a maximum clamping voltage (VC) of 275 V when subjected to its rated peak impulse current (IPP) of 2.2 A under the standard 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and ensures predictable overvoltage limiting for downstream circuitry in SMBJ170CA-protected designs.
Is SMBJ170CA unidirectional or bidirectional, and how is polarity identified?
SMBJ170CA is a bidirectional TVS diode, indicated by the "CA" suffix per Taiwan Semiconductor's naming convention. It has no functional anode/cathode distinction-both terminals behave identically under positive or negative transients. The cathode band marking is retained for mechanical orientation consistency but does not define conduction direction in SMBJ170CA.
Does SMBJ170CA meet automotive surge immunity standards?
Yes, SMBJ170CA is explicitly rated to meet ISO 7637-2 test pulses 1, 2a, 2b, 3a, and 3b, making it suitable for 12 V and 24 V automotive power networks. Its 600 W peak power rating, low clamping voltage, and -55°C to +150°C operating range align with AEC-Q200 stress test requirements for transient suppressors used in engine control units and body electronics.
What is the leakage current specification for SMBJ170CA at its working stand-off voltage?
At its working stand-off voltage (VWM) of 170 V, SMBJ170CA exhibits a maximum blocking leakage current (ID) of 1 µA at 25°C. This ultra-low leakage supports energy-sensitive applications such as battery-backed systems and low-power IoT sensors where standby current budget is tightly constrained.
Can SMBJ170CA be used in place of SMBJ170A in a design?
No-SMBJ170A is unidirectional (anode-cathode asymmetry), while SMBJ170CA is bidirectional. Substituting SMBJ170CA for SMBJ170A would eliminate polarity-dependent forward conduction behavior and may compromise protection in circuits relying on DC bias paths. Always verify schematic symbol and layout polarity before interchanging SMBJ170CA and SMBJ170A.
SMBJ170CA 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:
- 275V
- Current - Peak Pulse (10/1000µs):
- 2.2A
- 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)
SMBJ170CA FAQ
1.How can I place an order for SMBJ170CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ170CA 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 SMBJ170CA reliable?
The price and inventory of SMBJ170CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ170CA is usually 5 days.
3.What payment methods are accepted for SMBJ170CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ170CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ170CA?
SMBJ170CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ170CA 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 SMBJ170CA?
For technical support, including SMBJ170CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ170CA requirements.
6.How does Aetrix verify that SMBJ170CA is sourced from the original manufacturer or authorized distributors?
All SMBJ170CA 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 SMBJ170CA meets industry standards.
7.What is the process for return or replacement of SMBJ170CA?
All SMBJ170CA units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ170CA, 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 SMBJ170CA part is unused and in its original packaging.
Return procedure for SMBJ170CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ170CA Tags
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