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Taiwan Semiconductor Corporation SMCJ17
- Part No.:
- SMCJ17
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ17.pdf
- Description:
- 1500W, 21V, 10%, UNIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
SMCJ17 from Taiwan Semiconductor is a unidirectional 1500W surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with 17V working stand-off voltage (VWM), 18.9–23.1V breakdown voltage (VBR), and 30.5V maximum clamping voltage (VC) at 51A peak pulse current. It protects automotive power lines and industrial I/O interfaces against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMCJ17 datasheet, SMCJ17 pinout, SMCJ17 application, or SMCJ17 equivalent, this page delivers verified electrical parameters, thermal performance data, clamping behavior under 10/1000μs surge, polarity marking, and RoHS/halogen-free compliance - all critical for ESD and load-dump protection design validation.
Technical Context
The SMCJ17 operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its 18.9V minimum breakdown threshold at 1mA test current. Its glass-passivated junction enables sub-1.0ps response time and <1μA leakage above 10V, meeting stringent automotive immunity requirements.
Thermally, it features 10°C/W junction-to-case resistance and 55°C/W junction-to-ambient resistance, supporting 5W steady-state dissipation at 25°C ambient. Its DO-214AB package includes matte tin-plated leads compliant with J-STD-002 solderability and JESD 201 Class 2 whisker resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 17 V - Maximum continuous reverse operating voltage before conduction begins |
| VBR min/max | 18.9 / 23.1 V @ 1 mA - Ensures reliable turn-on within defined tolerance band during surge events |
| VC @ IPPM | 30.5 V @ 51 A - Clamped voltage limits downstream IC stress during 10/1000μs transients |
| PPK | 1500 W - Peak pulse power handling capability per single 1ms waveform per Fig.5 |
| IR @ VWM | <1 μA - Minimal leakage preserves low-power circuit integrity during normal operation |
| TJ max | +150 °C - Enables use in under-hood automotive environments and high-temperature industrial enclosures |
| RθJA | 55 °C/W - Defines thermal derating slope above 25°C ambient for sustained reliability |
Pinout & Package
DO-214AB (SMC) surface-mount package with cathode band marking on one end; bidirectional variants use "CA" suffix (e.g., SMCJ17CA), but SMCJ17 is unidirectional only.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side of protected line; conducts during forward surge or bias |
| Cathode | Reverse conduction / clamping terminal | Marked with band; connected to higher-potential side; avalanches into conduction when VREV > VBR |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Enables stable VBR tolerance and long-term reliability under repeated surge stress |
| ISO 7637-2 compliance | Validated for Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line impedance coupling) |
| Moisture sensitivity level 1 | Eliminates bake requirement prior to reflow; supports standard SMT assembly without floor-life constraints |
| UL 94V-0 molding compound | Prevents flame propagation in enclosure-integrated designs requiring safety certification |
| RoHS & halogen-free | Meets IEC 61249-2-21; suitable for consumer, industrial, and automotive supply chains with substance restrictions |
Applications
| Automotive Power Line Protection | Industrial PLC Digital I/O Protection |
|---|---|
Use Scenario: 12V battery feed line exposed to load dump (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and DC-DC input to clamp surges before regulator stage. Use Value: Limits transient voltage to ≤30.5V, preventing overvoltage damage to 36V-rated buck controllers and microcontrollers. | Use Scenario: 24V digital input channel subject to EFT bursts (IEC 61000-4-4) and inductive kickback from solenoid drivers. IC Role / Device Role / Timing Role: TVS mounted at connector entry point to shunt fast transients before signal conditioning circuitry. Use Value: Sub-1.0ps response ensures clamping initiates before EFT edges propagate into optocoupler or Schmitt trigger inputs. |
| LED Driver Output Protection | RS-485 Transceiver Bus Line Protection |
Use Scenario: Constant-current LED string driver output subjected to hot-swap transients and cable discharge events. IC Role / Device Role / Timing Role: SMCJ17 placed across output terminals to absorb energy from inductive flyback and ESD. Use Value: 1500W peak power rating handles multi-joule events without degradation, preserving LED system uptime. | Use Scenario: RS-485 bus lines routed through noisy factory environments with frequent ground potential shifts. IC Role / Device Role / Timing Role: Bidirectional protection required - SMCJ17 is unidirectional; SMCJ17CA would be used instead. For SMCJ17, this application requires external polarity management. Use Value: Not applicable for direct RS-485 bus protection due to unidirectional configuration; confirms need for CA variant selection in differential line applications. |
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 SMAJ17A | Same DO-214AC (SMA) package, 17V VWM, 30.6V VC @ 49.5A; slightly lower PPK (400W vs 1500W) | Lower surge capacity suits low-energy ESD-only scenarios, not load-dump duty cycles | Select SMAJ17A only when board space is constrained and peak surge energy is ≤0.4J |
| Vishay SMF17A | DO-219AB (SOD-123FL) package, 17V VWM, 27.6V VC @ 32.5A; rated 200W PPK | Smaller footprint but insufficient for ISO 7637-2 Pulse 5a; limited to IEC 61000-4-2/4-5 | Choose SMF17A for portable electronics where size outweighs automotive-grade surge margin |
Compared with SMAJ17A and SMF17A, the SMCJ17 delivers 3.75× higher peak power handling and DO-214AB thermal mass for sustained surge dissipation - making it the only option qualified for full ISO 7637-2 automotive load-dump immunity in 12V systems.
Availability
SMCJ17 is available at Aetrix Electronics and suitable for automotive body control modules, industrial programmable logic controller (PLC) I/O cards, LED lighting drivers, and 12V/24V power distribution units requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for SMCJ17 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, MOSFETs, and power management devices.
The SMCJ series was developed specifically for high-energy transient suppression in automotive and industrial power systems, emphasizing robustness under ISO 7637-2 and AEC-Q200-compliant stress profiles.
FAQ
What is the clamping voltage of SMCJ17 and how is it measured?
The SMCJ17 has a maximum clamping voltage (VC) of 30.5 V at 51 A peak pulse current (IPPM), tested using the 10/1000 μs double-exponential surge waveform per Fig.5 in the datasheet. This value represents the upper limit of voltage seen by downstream circuitry during worst-case transient events, ensuring protection of 36V-rated components.
Is SMCJ17 suitable for bidirectional transient protection?
No, SMCJ17 is a unidirectional TVS diode intended for DC line protection with defined polarity. For bidirectional applications such as AC lines or RS-485 buses, the SMCJ17CA variant must be selected - it shares identical VWM and VC ratings but conducts in both directions.
What is the thermal resistance of SMCJ17 and how does it affect layout?
The SMCJ17 has a junction-to-ambient thermal resistance (RθJA) of 55°C/W and junction-to-case resistance (RθJC) of 10°C/W. To maintain TJ ≤ 150°C under 1500W pulses, PCB copper area must provide ≥10 cm² of 2-oz copper pour connected to both terminals, per TSC's recommended pad layout for DO-214AB.
Does SMCJ17 meet automotive qualification standards?
The SMCJ17 meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b immunity requirements and is constructed with AEC-Q200-compatible materials (glass passivation, UL 94V-0 mold compound, JESD 201 Class 2 whisker resistance), though formal AEC-Q200 certification applies to the full SMCJ family and is documented separately by Taiwan Semiconductor.
How does SMCJ17 compare to SMCJ17A in terms of electrical performance?
The SMCJ17A offers tighter VBR tolerance (18.9–20.9 V vs 18.9–23.1 V), lower clamping voltage (27.6 V vs 30.5 V at same IPPM), and identical VWM (17 V). Both share DO-214AB packaging and 1500W PPK rating; SMCJ17A is preferred where lower clamping and tighter VBR are critical for sensitive downstream ICs.
SMCJ17 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):
- 17V
- Voltage - Breakdown (Min):
- 18.9V
- Voltage - Clamping (Max) @ Ipp:
- 30.5V
- Current - Peak Pulse (10/1000µs):
- 51A
- 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)
SMCJ17 FAQ
1.How can I place an order for SMCJ17 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ17 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 SMCJ17 reliable?
The price and inventory of SMCJ17 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ17 is usually 5 days.
3.What payment methods are accepted for SMCJ17?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ17 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ17?
SMCJ17 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ17 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 SMCJ17?
For technical support, including SMCJ17 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ17 requirements.
6.How does Aetrix verify that SMCJ17 is sourced from the original manufacturer or authorized distributors?
All SMCJ17 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 SMCJ17 meets industry standards.
7.What is the process for return or replacement of SMCJ17?
All SMCJ17 units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ17, 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 SMCJ17 part is unused and in its original packaging.
Return procedure for SMCJ17:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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