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Taiwan Semiconductor Corporation SMCJ170
- Part No.:
- SMCJ170
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ170.pdf
- Description:
- 1500W, 210V, 10%, UNIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
SMCJ170 from Taiwan Semiconductor is a unidirectional 1500W surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with 170V working stand-off voltage (VWM), 189–231V breakdown voltage (VBR), and 304V maximum clamping voltage (VC) at 5.1A peak impulse current - designed for high-energy surge protection in automotive power rails and industrial DC bus lines.
For engineers reviewing the SMCJ170 datasheet, SMCJ170 pinout, SMCJ170 application, or SMCJ170 equivalent, this device is selected for robust ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, sub-1ps response time, and low leakage (<1µA above 10V), making it critical for protecting 24V/48V/72V systems against load dump and inductive switching transients.
Technical Context
The SMCJ170 operates as a unidirectional avalanche diode with glass-passivated junction, optimized for fast clamping of high-energy transients up to 1500W (tp = 1ms). Its thermal design supports 150°C max junction temperature and 55°C/W junction-to-ambient resistance, enabling reliable operation in enclosed industrial enclosures without forced airflow.
It features a single-die configuration in DO-214AB package with matte tin-plated leads compliant with J-STD-002 solderability and JESD 201 Class 2 whisker resistance. Polarity is marked by cathode band; forward voltage is 5.0V at 100A, consistent across SMCJ100–SMCJ170 unidirectional variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 170 V - Maximum continuous reverse operating voltage before clamping begins; sets system-level overvoltage threshold for 72V+ DC bus applications. |
| VBR min/max | 189–231 V - Breakdown occurs within this range at 1mA test current; ensures predictable turn-on margin above VWM. |
| VC @ IPPM | 304 V - Clamped voltage at 5.1A peak impulse; defines worst-case voltage seen by protected downstream ICs during 10/1000µs surge. |
| PPK | 1500 W - Peak pulse power rating per 1ms waveform; validates capability to absorb automotive load dump energy without failure. |
| IR @ VWM | <1 µA - Reverse leakage at rated stand-off voltage; minimizes quiescent power loss and avoids false triggering in high-impedance sensing circuits. |
| TJ max | +150 °C - Maximum junction temperature; enables use in under-hood automotive modules and sealed industrial drives. |
| Package | DO-214AB (SMC) - Standardized surface-mount outline with 7.11 × 6.22 mm footprint and 2.3 mm height; compatible with automated pick-and-place and reflow. |
Pinout & Package
DO-214AB (SMC) package: molded epoxy case meeting UL 94V-0 flammability rating; cathode indicated by band on body; terminals are matte tin-plated leads suitable for standard SnPb or lead-free reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point in forward bias; connected to system ground or low-side reference | Provides low-impedance path to ground during transient clamping; must be routed with minimal inductance to preserve response speed. |
| Cathode | Current exit point in forward bias; connected to protected line (e.g., 72V rail) | Acts as the "protected node" interface; polarity marking ensures correct orientation to avoid catastrophic short-circuit during surge events. |
Key Features
| Feature | Design Value |
|---|---|
| ISO 7637-2 compliance | Validated for Pulse 1 (inductive load disconnect), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling) - meets OEM automotive EMC requirements without external filtering. |
| Sub-1ps response time | Typically <1.0 ps from 0 V to VBR min - enables clamping before sensitive logic or analog circuitry sustains damage from ESD or fast-rising transients. |
| Glass-passivated junction | Enhances long-term reliability under thermal cycling and humidity exposure; prevents degradation of VBR and leakage in harsh industrial environments. |
| Moisture sensitivity level 1 | No floor life limitation or bake requirement prior to assembly - simplifies manufacturing logistics and reduces handling overhead. |
| Halogen-free & RoHS | Complies with IEC 61249-2-21 and EU RoHS Directive - supports green product certification and end-of-life recycling mandates. |
Applications
| Automotive Load Dump Protection | Industrial DC Bus Surge Suppression |
|---|---|
Use Scenario: Protecting engine control unit (ECU) power input during alternator load dump events in 12V/24V/48V vehicle architectures. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and DC-DC converter input to clamp 120V/200V spikes within 1ms. Use Value: Limits voltage to ≤304V at 5.1A, preventing latch-up or gate oxide rupture in upstream PMICs and microcontrollers. |
Use Scenario: Safeguarding PLC I/O module power inputs against inductive kickback from solenoid valves and contactors in factory automation. IC Role / Device Role / Timing Role: Standoff protector on 24V/48V fieldbus power lines, absorbing repetitive 1500W surges without derating. Use Value: Maintains <1µA leakage at 170V, eliminating standby current errors in precision analog sensor front-ends. |
| Solar Inverter DC Link Protection | Rail-to-Rail ESD Clamp for High-Voltage Gate Drivers |
Use Scenario: Shielding photovoltaic string inverters' DC link capacitors and IGBT gate drivers from lightning-induced surges on rooftop arrays. IC Role / Device Role / Timing Role: Primary clamping element across 600–1000V DC bus, coordinated with MOVs for multi-stage protection. Use Value: Withstands 1500W peak power and 150°C junction temperature, enabling operation in unventilated outdoor enclosures. |
Use Scenario: Preventing ESD damage to isolated gate drivers (e.g., SiC MOSFET drivers) during PCB handling and field maintenance. IC Role / Device Role / Timing Role: Bidirectional-capable variant (SMCJ170A) used as rail-to-rail clamp between HV and LV domains in gate drive circuits. Use Value: 275V clamping voltage (SMCJ170A) limits transient overshoot below driver IC absolute maximum ratings, avoiding destructive latch-up. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ170A | Lower PPK (600W), smaller SMB package (3.94 × 2.59 mm), same VWM/VBR/VC specs | Suitable only for lower-energy transients (e.g., IEC 61000-4-2 ESD); insufficient for ISO 7637-2 Pulse 5a load dump | Select when board space is constrained and surge energy is limited to ≤600W. |
| 1.5KE170A | Through-hole DO-201 package, identical 1500W rating and 170V VWM, but slower response (>1ns) and higher thermal resistance (RθJA ≈ 100°C/W) | Requires manual insertion or wave soldering; unsuitable for fully automated SMT lines or thermally dense layouts | Choose only for legacy through-hole designs where rework flexibility outweighs SMT efficiency and thermal performance. |
Compared with SMBJ170A and 1.5KE170A, the SMCJ170 delivers superior surge handling in compact SMT form factor, with faster response and lower thermal resistance - essential for modern automotive and industrial power systems requiring both miniaturization and high-reliability transient immunity.
Availability
SMCJ170 is available at Aetrix Electronics and suitable for automotive electronics, industrial motor drives, and solar inverter designs requiring stable component supply, full traceability, and long-lifecycle support.
Supply support for SMCJ170 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 Taiwanese semiconductor manufacturer specializing in discrete power devices, including TVS diodes, rectifiers, and MOSFETs, with ISO/TS 16949 and IATF 16949 certifications.
The SMCJ series was developed specifically for high-reliability transient suppression in automotive and industrial environments, emphasizing ISO 7637-2 compliance, low leakage, and robust thermal performance in surface-mount packages.
FAQ
What is the clamping voltage of the SMCJ170 under standard 10/1000µs surge conditions?
The SMCJ170 has a maximum clamping voltage (VC) of 304 V at 5.1 A peak impulse current (IPPM), measured per the 10/1000µs double-exponential waveform defined in Fig.5 of the datasheet. This value represents the worst-case voltage imposed on protected circuitry during a standardized surge event and is critical for verifying compatibility with downstream IC voltage tolerances.
Is the SMCJ170 suitable for bidirectional transient protection?
No - the SMCJ170 is a unidirectional TVS diode intended for DC line protection with defined polarity (cathode marked). For bidirectional applications such as AC lines or data bus protection, the SMCJ170A variant must be used, which provides symmetrical clamping in both directions and is explicitly rated for bipolar operation per the datasheet.
What is the forward voltage drop of the SMCJ170 at high surge current?
The SMCJ170 exhibits a forward voltage (VF) of 5.0 V at 100 A peak forward surge current, as specified in the Absolute Maximum Ratings table. This parameter applies only during unidirectional conduction and is relevant for evaluating voltage drop during extreme inductive switching events in automotive and industrial power circuits.
Does the SMCJ170 require derating at elevated ambient temperatures?
Yes - the SMCJ170's peak pulse power rating must be derated above 25°C ambient, following the Pulse Derating Curve (Fig.2). At 85°C ambient, its 1500W rating drops to approximately 900W; at 125°C, it falls to ~450W. Thermal design must account for RθJA = 55°C/W and ensure junction temperature remains ≤150°C under worst-case operating conditions.
How does the SMCJ170 compare to the SMCJ170A in terms of electrical performance?
The SMCJ170A differs from the SMCJ170 primarily in breakdown voltage tightness (189–209 V vs. 189–231 V) and clamping voltage (275 V vs. 304 V at respective IPPM), due to tighter VBR tolerances and optimized junction design. Both share identical VWM (170 V), package (DO-214AB), and ISO 7637-2 compliance, but only the SMCJ170A supports bidirectional operation.
SMCJ170 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AB, SMC
- Series:
- SMCJ
- 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):
- 5.1A
- Power - Peak Pulse:
- 1500W (1.5kW)
- 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-214AB (SMC)
SMCJ170 FAQ
1.How can I place an order for SMCJ170 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ170 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 SMCJ170 reliable?
The price and inventory of SMCJ170 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ170 is usually 5 days.
3.What payment methods are accepted for SMCJ170?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ170 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ170?
SMCJ170 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ170 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 SMCJ170?
For technical support, including SMCJ170 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ170 requirements.
6.How does Aetrix verify that SMCJ170 is sourced from the original manufacturer or authorized distributors?
All SMCJ170 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 SMCJ170 meets industry standards.
7.What is the process for return or replacement of SMCJ170?
All SMCJ170 units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ170, 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 SMCJ170 part is unused and in its original packaging.
Return procedure for SMCJ170:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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