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Taiwan Semiconductor Corporation SMCJ30
- Part No.:
- SMCJ30
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ30.pdf
- Description:
- 1500W, 37V, 10%, UNIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:2,980
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Product details
Overview
SMCJ30 from Taiwan Semiconductor is a unidirectional 1500W surface-mount transient voltage suppressor (TVS) diode 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 load-dump and inductive switching protection in power supply rails and DC input stages.
For engineers reviewing the SMCJ30 datasheet, SMCJ30 pinout, SMCJ30 application, or SMCJ30 equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, junction temperature derating above 25°C, thermal resistance (RθJA = 55°C/W), and compatibility with automated SMT placement on industrial and automotive PCBs.
Technical Context
The SMCJ30 operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its VBR range (33.3–40.7V @ 1mA). It clamps transients to ≤53.5V at 29A (10/1000μs waveform), limiting energy dissipation to 1500W for non-repetitive pulses. Its glass-passivated junction ensures stable leakage (<1μA @ 30V) and fast response (<1.0ps).
Thermally, it supports operation from –55°C to +150°C junction temperature, with RθJC = 10°C/W and RθJA = 55°C/W. It meets JESD201 Class 2 whisker resistance, J-STD-020 Level 1 moisture sensitivity, and UL 94V-0 molding compound requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 30 V - Maximum continuous reverse operating voltage before conduction begins |
| VBR min/max | 33.3 V / 40.7 V @ 1 mA - Voltage range at which avalanche breakdown initiates reliably |
| VC @ IPPM | 53.5 V @ 29 A - Clamped voltage during 10/1000μs surge, defining worst-case rail overvoltage |
| PPK | 1500 W - Peak pulse power handling capability for single-event transients |
| IR @ VWM | <1 μA - Reverse leakage current ensuring minimal standby power loss and signal integrity |
| TJ max | +150 °C - Maximum junction temperature enabling use in under-hood automotive environments |
| RθJA | 55 °C/W - Thermal resistance from junction to ambient, guiding heatsinking and layout decisions |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, single-diode configuration with cathode band marking. Dimensions conform to JEDEC DO-214AB standard; terminals are matte tin-plated for J-STD-002 solderability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path) in unidirectional TVS configuration |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., 24V rail); conducts only during overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity stress |
| ISO 7637-2 compliance | Validated for Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line impedance coupling) |
| Fast response time | <1.0 ps rise time enables clamping before sensitive downstream ICs experience overstress |
| Halogen-free & RoHS | Complies with IEC 61249-2-21 and EU RoHS Directive for environmentally regulated end equipment |
| Automated placement compatible | DO-214AB footprint and lead geometry support high-speed pick-and-place with >99.9% placement yield |
Applications
| Automotive Power Rail Protection | Industrial DC Input Stage |
|---|---|
Use Scenario: Protecting 24V battery-fed ECUs against load-dump transients up to 120V per ISO 7637-2 Pulse 5a. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and input filter capacitor, clamping surges within 1.0ps. Use Value: Limits rail voltage to ≤53.5V during 29A surge, preventing damage to upstream DC-DC controllers and microcontrollers. | Use Scenario: Safeguarding programmable logic controller (PLC) 24V digital input modules from field-wiring inductive kickback. IC Role / Device Role / Timing Role: Standoff device across input terminals, absorbing energy from solenoid/relay coil de-energization. Use Value: Withstands 1500W peak pulses without degradation, enabling >100,000 surge cycles per IEC 61000-4-5. |
| LED Driver Overvoltage Clamp | Telecom Power Interface |
Use Scenario: Clamping voltage spikes on constant-current LED driver outputs caused by cable ESD or hot-plug events. IC Role / Device Role / Timing Role: Parallel-connected TVS at driver output node, conducting only during transient excursions above 30V. Use Value: Maintains <1μA leakage at 30V, avoiding false triggering or efficiency loss in steady-state operation. | Use Scenario: Front-end protection of PoE-powered network switches against lightning-induced surges on 48V DC input lines. IC Role / Device Role / Timing Role: Primary clamping element before DC-DC converter, rated for repetitive 10/1000μs waveforms. Use Value: Delivers 53.5V clamping at 29A with RθJA = 55°C/W, supporting sustained operation in enclosed telecom enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ30A | 600W rating, SMB package (smaller footprint), lower IPPM (15.5A), higher VC (53.3V) | Lower power handling limits use to sub-1kW transients; preferred where board space is constrained | Select SMBJ30A only if system-level surge energy is confirmed ≤600W and layout cannot accommodate SMC outline |
| 1.5SMC30A | Same 1500W rating and DO-214AB package, but from ON Semiconductor; VBR 33.3–40.7V, VC 53.5V, IR <1μA | Functionally identical clamping behavior and thermal specs; qualified for same automotive/industrial standards | 1.5SMC30A is a direct functional alternative with validated supply chain diversity; no design change required |
Compared with SMCJ30, SMBJ30A offers space savings at the cost of 60% lower surge energy capacity, while 1.5SMC30A delivers identical electrical and thermal performance with alternate sourcing - making it ideal for BOM resilience without layout revision.
Availability
SMCJ30 is available at Aetrix Electronics and suitable for automotive ECU protection, industrial PLC input stages, LED driver overvoltage clamp circuits, and telecom power interface designs requiring stable component supply and full traceability.
Supply support for SMCJ30 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 is part of TSC's high-power transient suppression product line, engineered specifically for ISO 7637-2-compliant automotive and harsh-environment industrial applications demanding robust 1500W surge immunity.
FAQ
What is the clamping voltage of SMCJ30 under a 10/1000μs surge?
The SMCJ30 clamps to a maximum of 53.5 V when subjected to a 29 A peak pulse current with a 10/1000μs waveform, as specified in the official Taiwan Semiconductor datasheet (Version S2104, Page 3). This value defines the upper voltage limit imposed on protected circuitry during transient events and is measured at the device terminals under standardized test conditions.
Is SMCJ30 unidirectional or bidirectional?
SMCJ30 is a unidirectional TVS diode, indicated by the absence of "C" or "CA" suffix. It conducts only in reverse bias above its breakdown voltage and must be installed with cathode toward the protected line. Bidirectional variants (e.g., SMCJ30C) are explicitly marked and exhibit symmetrical clamping in both polarities.
What is the maximum junction temperature rating for SMCJ30?
The SMCJ30 has a maximum junction temperature (TJ) rating of +150°C, enabling reliable operation in under-hood automotive environments and enclosed industrial enclosures. This rating is supported by its RθJA of 55°C/W and RθJC of 10°C/W, allowing thermal design margin when mounted on standard FR-4 PCBs with adequate copper area.
Does SMCJ30 meet automotive transient immunity standards?
Yes, SMCJ30 meets ISO 7637-2 requirements for Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line impedance coupling), as stated in the Taiwan Semiconductor datasheet (Version S2104, Page 1). Its 1500W peak power rating and sub-1ps response ensure compliance with these test waveforms when properly applied in circuit.
What packaging and reel quantity is offered for SMCJ30?
SMCJ30 is supplied in DO-214AB (SMC) package on tape-and-reel format, with 3,000 units per reel, per Taiwan Semiconductor's ordering information (Version S2104, Page 4). This configuration supports automated SMT assembly and is compatible with standard 8mm carrier tape feeders.
SMCJ30 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:
- 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)
SMCJ30 FAQ
1.How can I place an order for SMCJ30 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ30 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 SMCJ30 reliable?
The price and inventory of SMCJ30 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ30 is usually 5 days.
3.What payment methods are accepted for SMCJ30?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ30 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ30?
SMCJ30 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ30 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 SMCJ30?
For technical support, including SMCJ30 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ30 requirements.
6.How does Aetrix verify that SMCJ30 is sourced from the original manufacturer or authorized distributors?
All SMCJ30 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 SMCJ30 meets industry standards.
7.What is the process for return or replacement of SMCJ30?
All SMCJ30 units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ30, 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 SMCJ30 part is unused and in its original packaging.
Return procedure for SMCJ30:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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