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Taiwan Semiconductor Corporation SMCJ30C
- Part No.:
- SMCJ30C
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ30C.pdf
- Description:
- 1500W, 37V, 10%, BIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:8,600
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Product details
Overview
SMCJ30C from Taiwan Semiconductor is a bidirectional 1500W surface-mount transient voltage suppressor (TVS) in DO-214AB (SMC) package, with 30V working stand-off voltage (VWM), 33.3–40.7V breakdown voltage (VBR), and 53.5V maximum clamping voltage (VC) at 29A peak pulse current - designed for automotive ESD and load-dump protection in power supply rails and CAN/LIN interfaces.
For engineers reviewing the SMCJ30C datasheet, SMCJ30C pinout, SMCJ30C application, or SMCJ30C equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, unidirectional vs. bidirectional configuration (C suffix = bidirectional), thermal derating above 25°C, and compatibility with automated SMT placement on high-reliability industrial PCBs.
Technical Context
The SMCJ30C is a silicon avalanche diode configured as a bidirectional TVS, operating symmetrically in both forward and reverse bias to clamp transients up to 1500W (10/1000μs waveform). Its glass-passivated junction ensures stable VBR and low leakage (<1μA at 30V), while its DO-214AB package delivers 55°C/W junction-to-ambient thermal resistance.
It meets ISO 7637-2 immunity requirements for automotive electronics, with sub-1ps response time from 0V to VBR min, and supports steady-state power dissipation of 5W at 25°C ambient - requiring thermal design consideration for sustained surge events or elevated ambient temperatures.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 30 V - maximum continuous reverse voltage before clamping begins; defines safe operating rail margin |
| VBR min/max | 33.3 V / 40.7 V @ 1 mA - verified avalanche onset range; ensures predictable turn-on across temperature and lot |
| VC @ IPPM | 53.5 V @ 29 A - clamped voltage during 10/1000μs surge; determines protected circuit's maximum overvoltage stress |
| PPK | 1500 W - peak pulse power handling per single 10/1000μs event; defines transient energy absorption capacity |
| IR @ VWM | <1 μA - reverse leakage at rated stand-off; negligible loading on 30V supply rails |
| TJ max | +150 °C - maximum junction temperature; enables operation in under-hood automotive environments |
| RθJA | 55 °C/W - thermal resistance from junction to ambient; informs copper pour and airflow requirements for thermal management |
Pinout & Package
DO-214AB (SMC) surface-mount package: molded epoxy case meeting UL 94V-0, matte tin-plated leads, polarity indicated by cathode band (bidirectional symmetry eliminates functional polarity distinction).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional avalanche junction terminals | No functional polarity - either terminal serves as input/output for transient suppression in AC or differential lines |
| Case (exposed metal pad) | Thermal path and mechanical anchor | Not electrically connected; must be thermally coupled to PCB copper for effective heat dissipation |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures long-term VBR stability and low parameter drift across temperature cycling and humidity exposure |
| ISO 7637-2 compliance (Pulse 1/2a/2b/3a/3b) | Validated for automotive power line immunity - directly applicable to 12V/24V battery rail protection without external filtering |
| Sub-1ps response time | Clamps transients before sensitive downstream ICs experience overvoltage - critical for protecting CAN transceivers and microcontrollers |
| Moisture sensitivity level 1 (J-STD-020) | Zero bake requirement prior to reflow; compatible with standard SMT assembly processes without moisture-related popcorning risk |
| RoHS & halogen-free (IEC 61249-2-21) | Meets global environmental compliance mandates for automotive and industrial end equipment |
Applications
| Automotive Power Rail Protection | CAN/LIN Bus Transient Suppression |
|---|---|
Use Scenario: Protecting 12V battery-supplied ECUs from load dump (ISO 7637-2 Pulse 5a) and alternator switching transients. IC Role / Device Role / Timing Role: Primary clamping device placed at power entry point, absorbing >1500W surges within microseconds. Use Value: Limits rail voltage to ≤53.5V during 35V/100ms load dump events, preventing damage to 36V-rated DC-DC converters and MCU power supplies. | Use Scenario: Shielding CAN FD and LIN physical layer transceivers from ESD (IEC 61000-4-2) and coupled fast transients. IC Role / Device Role / Timing Role: Bidirectional shunt element across differential bus lines (CAN_H/CAN_L or LIN), clamping common-mode and differential surges. Use Value: Maintains signal integrity by clamping bus voltage to ±53.5V without adding capacitance that degrades 5 Mbps CAN FD rise/fall times. |
| Industrial Sensor Interface Protection | LED Driver Input Stage Protection |
Use Scenario: Safeguarding 4–20mA analog sensor inputs and digital I/Os in factory automation PLC modules exposed to relay coil flyback and EFT. IC Role / Device Role / Timing Role: Front-end TVS on signal conditioning inputs, placed before precision op-amps and ADCs. Use Value: Prevents latch-up and parametric shift in instrumentation amplifiers by limiting transient-induced overvoltage to <53.5V at the input node. | Use Scenario: Protecting constant-current LED drivers from inductive kickback during MOSFET switching and AC line surges. IC Role / Device Role / Timing Role: Parallel-connected TVS across driver input capacitors and MOSFET drain-source nodes. Use Value: Absorbs 1500W flyback energy without degradation, enabling use of lower-cost 60V-rated MOSFETs instead of 100V+ devices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ30CA (Bourns) | Same DO-214AA (SMB) package; 600W PPK rating; 53.3V VC @ 11.8A | Limited to lower-energy transients; unsuitable for ISO 7637-2 Pulse 5a load dump | Select SMCJ30C when 1500W surge capability and DO-214AB thermal mass are required. |
| 1.5KE30CA (ON Semiconductor) | Through-hole DO-15 package; 1500W PPK; 53.3V VC @ 28.3A; higher RθJA (~65°C/W) | Requires manual or wave soldering; incompatible with high-density SMT layouts | Choose SMCJ30C for automated SMT production and improved thermal performance in space-constrained designs. |
Compared with SMBJ30CA and 1.5KE30CA, the SMCJ30C uniquely combines 1500W surge rating, DO-214AB surface-mount form factor, and ISO 7637-2 validation - making it the optimal choice for automotive-grade SMT power rail protection where board space, thermal reliability, and regulatory compliance are jointly constrained.
Availability
SMCJ30C is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface development, and LED driver manufacturing requiring stable component supply and full traceability through extended product lifecycles.
Supply support for SMCJ30C 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 for automotive and industrial markets.
The SMCJ series is part of TSC's high-power TVS platform engineered specifically for ISO 7637-2-compliant automotive transient suppression, emphasizing robust clamping consistency, low leakage, and SMT manufacturability.
FAQ
What does the 'C' suffix indicate in SMCJ30C?
The 'C' suffix in SMCJ30C denotes a bidirectional configuration - meaning the device functions identically in both polarities and has no designated anode or cathode for circuit connection. This is confirmed in the datasheet's "Devices for bipolar applications" section, which states that C or CA suffixes apply to bidirectional use across the SMCJ5.0–SMCJ170 family. The SMCJ30C thus provides symmetrical clamping for AC signals, differential buses like CAN, or ungrounded power systems.
Is SMCJ30C compliant with automotive transient standards?
Yes, the SMCJ30C meets ISO 7637-2 requirements for Pulse 1 (inductive load disconnect), Pulse 2a (sudden load removal), Pulse 2b (inductive switch-off), Pulse 3a (capacitive discharge), and Pulse 3b (battery connection/disconnection). This compliance is explicitly stated in the FEATURES section of the datasheet and validated via standardized test waveforms - confirming its suitability for 12V and 24V automotive power rail protection without additional filtering components.
What is the maximum clamping voltage of SMCJ30C and under what test condition?
The maximum clamping voltage (VC) of the SMCJ30C is 53.5 V, measured at a peak pulse current (IPPM) of 29 A using the 10/1000 μs double-exponential waveform defined in Fig.5 of the datasheet. This value is specified in the ELECTRICAL SPECIFICATIONS table for SMCJ30 and is guaranteed across temperature and production lots - serving as the definitive upper bound for voltage seen by downstream circuitry during worst-case surge events.
Can SMCJ30C be used in place of a unidirectional SMCJ30A?
No - the SMCJ30C is bidirectional and cannot replace the unidirectional SMCJ30A in circuits requiring polarity-sensitive clamping, such as DC power rails with defined ground reference. While both share identical VWM (30 V), VBR (33.3–40.7 V), and VC (53.5 V), the SMCJ30A has a marked cathode band and conducts only in reverse bias. Substituting SMCJ30C in a unidirectional design may cause unintended conduction during normal forward-biased operation, risking system malfunction or damage.
What is the thermal resistance and how does it affect layout design for SMCJ30C?
The SMCJ30C has a junction-to-ambient thermal resistance (RθJA) of 55°C/W, as specified in the THERMAL PERFORMANCE table. This means each watt of sustained power dissipation raises the junction temperature by 55°C above ambient - necessitating adequate PCB copper area (especially under the exposed pad) and optional airflow for applications involving repetitive surges or elevated ambient temperatures. Layouts must follow the SUGGESTED PAD LAYOUT in the PACKAGE OUTLINE DIMENSIONS section to achieve rated thermal performance.
SMCJ30C 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:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 30V
- Voltage - Breakdown (Min):
- 33.3V
- Voltage - Clamping (Max) @ Ipp:
- 53.5V
- Current - Peak Pulse (10/1000µs):
- 29A
- 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)
SMCJ30C FAQ
1.How can I place an order for SMCJ30C through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ30C 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 SMCJ30C reliable?
The price and inventory of SMCJ30C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ30C is usually 5 days.
3.What payment methods are accepted for SMCJ30C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ30C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ30C?
SMCJ30C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ30C 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 SMCJ30C?
For technical support, including SMCJ30C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ30C requirements.
6.How does Aetrix verify that SMCJ30C is sourced from the original manufacturer or authorized distributors?
All SMCJ30C 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 SMCJ30C meets industry standards.
7.What is the process for return or replacement of SMCJ30C?
All SMCJ30C units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ30C, 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 SMCJ30C part is unused and in its original packaging.
Return procedure for SMCJ30C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ30C Tags
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