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Taiwan Semiconductor Corporation SMCJ30A
- Part No.:
- SMCJ30A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ30A.pdf
- Description:
- TVS DIODE 30VWM 48.4VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:3,446
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Product details
Overview
SMCJ30A from Taiwan Semiconductor is a unidirectional 30V stand-off transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, rated for 1500W peak pulse power, 48.4V maximum clamping voltage at 32A peak current, and <1.0ps response time. It protects automotive and industrial power rails against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMCJ30A datasheet, SMCJ30A pinout, SMCJ30A application, or SMCJ30A equivalent, this page delivers verified electrical specs, clamping behavior under surge, thermal resistance values, moisture sensitivity level (MSL 1), and direct alternatives with documented VBR, VC, and IPPM differences.
Technical Context
The SMCJ30A uses a glass-passivated silicon junction optimized for fast transient suppression, with breakdown voltage tightly specified at 33.3V (min) to 36.8V (max) at 1mA test current. Its unidirectional configuration provides forward conduction path during overvoltage events while maintaining low leakage (<1μA at 30V).
Thermal performance is defined by RθJA = 55°C/W and RθJC = 10°C/W, enabling reliable operation up to TJ = +150°C. The device meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements for surface-mount reliability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 30 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR @ IT=1mA | 33.3–36.8 V - Confirmed breakdown range ensuring predictable turn-on during transients |
| VC @ IPPM=32A | 48.4 V - Clamping voltage limiting downstream circuit stress during 10/1000μs surge |
| PPK | 1500 W - Peak pulse power handling per single 1ms waveform per Fig.5 |
| IR @ VWM | <1 μA - Minimal leakage preserving signal integrity and low-power standby states |
| TJ max | +150 °C - Junction temperature limit supporting under-hood and industrial ambient conditions |
Pinout & Package
DO-214AB (SMC) surface-mount package with cathode band marking; matte tin-plated leads compliant with J-STD-002 solderability and JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connects to protected circuit ground or low-side return path during clamping |
| Cathode | Reverse-biased input terminal | Connects to line/rail being protected; marked with band on body |
Key Features
| Feature | Design Value |
|---|---|
| Clamping speed | <1.0 ps response - Enables protection of high-speed interfaces and microcontroller I/O against EFT and load dump |
| ISO 7637-2 compliance | Validated for Pulse 1/2a/2b/3a/3b - Meets automotive EMC immunity requirements without external filtering |
| Moisture sensitivity | MSL 1 - No bake requirement prior to reflow, simplifying SMT production flow |
| Halogen-free construction | Complies with IEC 61249-2-21 - Supports RoHS-compliant and environmentally regulated end products |
Applications
| Automotive Power Rail Protection | Industrial PLC Input Protection |
|---|---|
Use Scenario: 12V battery rail in engine control units exposed to load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS clamping transient energy before it reaches MCU power pins or CAN transceivers. Use Value: Limits voltage to ≤48.4V during 32A surge, preventing latch-up or permanent damage to 5V/3.3V logic supplies. | Use Scenario: 24V DC digital input module receiving signals from field sensors in factory automation. IC Role / Device Role / Timing Role: Standoff protector absorbing inductive kickback from solenoid or relay coils. Use Value: Withstands repetitive 1500W pulses without degradation, extending system uptime versus Zener-based solutions. |
| LED Driver Overvoltage Clamp | ESD-Sensitive Interface Protection |
Use Scenario: Constant-current LED driver output subjected to wiring fault transients in outdoor signage. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed across LED string terminals. Use Value: Fast <1.0ps response prevents LED open-circuit failure during 100ns-fast edge transients. | Use Scenario: RS-485 transceiver data lines routed near motor drives in motion control systems. IC Role / Device Role / Timing Role: Secondary-level TVS on differential bus lines to absorb coupled EFT bursts. Use Value: 48.4V clamping ensures transceiver remains within absolute maximum ratings during ±2kV ESD events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ30A | Lower PPK = 600W; same VBR/VC but reduced IPPM = 12.3A | Not suitable for ISO 7637-2 Pulse 5a (load dump); limited to lower-energy transients | Select when board space is constrained and surge energy does not exceed 600W |
| 1.5KE30A | Through-hole TO-204AA (DO-41); higher VF = 3.5V; identical VBR/VC specs | Requires wave soldering or hand assembly; incompatible with automated SMT lines | Select only for legacy through-hole designs or prototyping where reflow compatibility is not required |
Compared with SMBJ30A and 1.5KE30A, the SMCJ30A delivers 2.5× higher surge power handling in an SMT-optimized package, enabling robust protection in automotive and industrial modules where both space and reliability are critical.
Availability
SMCJ30A is available at Aetrix Electronics and suitable for automotive power rail protection, industrial PLC input conditioning, and LED driver overvoltage clamping requiring stable component supply across multi-year production cycles.
Supply support for SMCJ30A 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, serving global automotive, industrial, and consumer markets since 1979.
The SMCJ series is part of TSC's transient protection product line, engineered specifically for high-reliability, high-energy surge suppression in harsh environments including automotive power systems and industrial control cabinets.
FAQ
What is the breakdown voltage range of the SMCJ30A?
The SMCJ30A has a guaranteed breakdown voltage range of 33.3 V (minimum) to 36.8 V (maximum) measured at 1 mA test current per ANSI/IEEE C62.35. This tight VBR window ensures consistent clamping onset across production lots and supports precise overvoltage margining in safety-critical designs using the SMCJ30A.
Is the SMCJ30A unidirectional or bidirectional?
The SMCJ30A is a unidirectional TVS diode, indicated by the absence of "C" or "CA" suffix. It conducts only in reverse breakdown mode and provides forward conduction like a standard rectifier diode. This makes the SMCJ30A appropriate for DC rail protection where polarity is fixed, unlike bidirectional variants used in AC or differential signal lines.
What is the maximum clamping voltage of the SMCJ30A at its rated peak current?
The SMCJ30A exhibits a maximum clamping voltage (VC) of 48.4 V when subjected to its rated 32 A peak impulse current (IPPM) under the standardized 10/1000 μs double-exponential waveform. This value is confirmed in the Electrical Specifications table and defines the upper voltage limit imposed on protected circuits during worst-case surge events involving the SMCJ30A.
Does the SMCJ30A meet automotive transient immunity standards?
Yes, the SMCJ30A meets ISO 7637-2 requirements for Pulse 1 (inductive load disconnect), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling), as explicitly stated in the Features section. Its 1500W rating and sub-1ps response make it suitable for protecting ECUs, body controllers, and infotainment power inputs per OEM-level test plans referencing the SMCJ30A.
What is the moisture sensitivity level (MSL) of the SMCJ30A?
The SMCJ30A is rated MSL 1 per J-STD-020, meaning it may be stored indefinitely at ambient conditions (≤30°C / 60% RH) without baking prior to reflow soldering. This eliminates floor-life tracking and pre-bake steps in high-volume SMT manufacturing, reducing process complexity and cost for assemblies incorporating the SMCJ30A.
SMCJ30A 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):
- 30V
- Voltage - Breakdown (Min):
- 33.3V
- Voltage - Clamping (Max) @ Ipp:
- 48.4V
- Current - Peak Pulse (10/1000µs):
- 31A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- Yes
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
SMCJ30A FAQ
1.How can I place an order for SMCJ30A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ30A 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 SMCJ30A reliable?
The price and inventory of SMCJ30A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ30A is usually 5 days.
3.What payment methods are accepted for SMCJ30A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ30A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ30A?
SMCJ30A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ30A 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 SMCJ30A?
For technical support, including SMCJ30A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ30A requirements.
6.How does Aetrix verify that SMCJ30A is sourced from the original manufacturer or authorized distributors?
All SMCJ30A 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 SMCJ30A meets industry standards.
7.What is the process for return or replacement of SMCJ30A?
All SMCJ30A units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ30A, 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 SMCJ30A part is unused and in its original packaging.
Return procedure for SMCJ30A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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