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STMicroelectronics SMCJ30A-TR
- Part No.:
- SMCJ30A-TR
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ30A-TR.pdf
- Description:
- TVS DIODE 30VWM 64.3VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:9,402
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Product details
Overview
SMCJ30A-TR from STMicroelectronics is a unidirectional 30 V standoff transient voltage suppression (TVS) diode in SMC package, rated for 1500 W peak pulse power (10/1000 µs), 64.3 A maximum peak pulse current, and 48.4 V clamping voltage at 32 A. It delivers low leakage (0.2 µA at 25 °C), operates up to 150 °C junction temperature, and meets IEC 61000-4-2 level 4 ESD immunity (30 kV contact/air) for DC power rail protection in industrial SMPS.
For engineers reviewing the SMCJ30A-TR datasheet, SMCJ30A-TR pinout, SMCJ30A-TR application, or SMCJ30A-TR equivalent, key selection criteria include clamping voltage margin vs. protected IC VDD, thermal derating above 25 °C, PCB copper area impact on Rth(j-a), and unidirectional polarity alignment with DC supply rails.
Technical Context
This TVS diode uses planar silicon junction technology optimized for high-reliability surge suppression in DC power paths. Its 0.361 Ω dynamic resistance enables tight clamping under 8/20 µs surges, while the 10-4/°C temperature coefficient of VBR ensures predictable breakdown shift across -55 °C to +150 °C operation.
The device complies with IEC 61000-4-4 level 4 (4 kV), exceeds IEC 61000-4-2 level 4 ESD (30 kV air/contact), and supports reflow soldering per J-STD-020 MSL level 1. Its SMC package provides 1.9–2.45 mm body height and 7.75–8.15 mm width for robust thermal dissipation on FR4 PCBs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRWM) | 30 V - Maximum continuous DC operating voltage before breakdown; sets minimum system rail voltage compatibility. |
| Breakdown Voltage (VBR) | 33.3–35.1 V at 1 mA - Confirmed threshold where device enters avalanche conduction; defines overvoltage trip point. |
| Clamping Voltage (VCL) | 48.4 V at 32 A (10/1000 µs) - Peak voltage seen by protected circuit during surge; determines safe margin over IC absolute max rating. |
| Peak Pulse Power (PPP) | 1500 W (10/1000 µs) - Sustained surge energy handling capability at 25 °C; derates to 1250 W at Tj = 150 °C. |
| Leakage Current (IR) | 0.2 µA at 30 V and 25 °C - Negligible standby power loss; critical for battery-powered or low-power sensor nodes. |
| Junction Temperature Range | -55 °C to +150 °C - Enables deployment in automotive engine bays, industrial motor drives, and outdoor power supplies. |
| Dynamic Resistance (RD) | 0.361 Ω - Low impedance during conduction minimizes VCL rise under high-current transients. |
Pinout & Package
SMCJ30A-TR is housed in an SMC (DO-214AB) surface-mount package with two terminals: Cathode (marked band) and Anode. The package measures 7.75–8.15 mm in length, 5.55–6.25 mm in width, and 1.90–2.45 mm in height, with matte tin-plated leads compliant with JESD 22-B102 E3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Surge current sink | Connected to protected line (e.g., +12 V rail); conducts avalanche current to ground during overvoltage events. |
| Anode | Reference node | Connected to system ground; establishes reference for clamping action and defines unidirectional polarity. |
Key Features
| Feature | Design Value |
|---|---|
| IEC 61000-4-2 ESD immunity | 30 kV contact and air discharge - Eliminates need for external ESD filters in industrial HMI and PLC I/O modules. |
| High-temperature operation | Rated to 150 °C junction temperature - Supports placement near heat-generating components like MOSFETs or transformers without derating penalties. |
| Low dynamic resistance | 0.361 Ω - Reduces clamping voltage overshoot during fast-rising transients, improving protection margin for 3.3 V/5 V logic rails. |
| UL94 V0 epoxy housing | Flame-retardant encapsulation - Meets safety requirements for Class I and II AC/DC power supplies in medical and industrial equipment. |
| MSL level 1 moisture sensitivity | No dry-pack or bake required before reflow - Simplifies manufacturing flow and reduces assembly cost for high-volume production. |
Applications
| Industrial SMPS Input Protection | Automotive Body Control Module (BCM) Power Rails |
|---|---|
|
Use Scenario: 24 V DC input stage of switch-mode power supply subjected to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VIN and GND to clamp transients before primary-side controller IC. Use Value: 48.4 V clamping ensures protected controller (e.g., UC384x) remains below its 60 V abs max rating during 100 V/50 ms load dump events. |
Use Scenario: 12 V battery-supplied BCM powering window lift motors and door lock actuators. IC Role / Device Role / Timing Role: TVS mounted at main power entry to suppress ISO 16750-2 jump-start surges and alternator ripple. Use Value: 1500 W peak power rating handles 100 V/40 ms jump-start pulses without degradation, extending system lifetime. |
| Telecom PoE Midspan Injector Ports | Factory Automation I/O Terminal Blocks |
|
Use Scenario: DC power delivery lines (48 V) in IEEE 802.3af/at midspan injectors exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Primary surge clamp on PSE output side, coordinated with secondary MOV and gas discharge tube. Use Value: 0.2 µA leakage prevents measurable power loss across 100+ ports, maintaining PoE efficiency compliance. |
Use Scenario: 24 V digital input modules receiving signals from proximity sensors and limit switches in harsh factory environments. IC Role / Device Role / Timing Role: Point-of-entry TVS on each channel to suppress EFT bursts per IEC 61000-4-4 level 4 (4 kV). Use Value: 30 kV ESD rating prevents latch-up or gate oxide damage in input buffer ICs during maintenance hot-plug operations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ30A-TR | Same VRWM (30 V) but lower PPP (600 W), higher VCL (49.9 V at 12 A), SMB package (smaller footprint, higher Rth(j-a)). | Limited to lower-energy surges; unsuitable for load dump or high-current EFT scenarios requiring >1 kA peak current. | Select when board space is constrained and surge threat level is limited to IEC 61000-4-2 only. |
| 1.5KE30A | Same VRWM (30 V) but axial leaded DO-201 package, higher VCL (49.9 V at 30 A), 1500 W rating at 25 °C only (no high-Tj derating data). | Requires through-hole assembly; lacks MSL level 1 and reflow profile support; not suitable for automated SMT lines. | Select only for legacy through-hole designs or prototyping where hand-soldering is acceptable. |
Compared with SMBJ30A-TR and 1.5KE30A, SMCJ30A-TR offers superior thermal performance at elevated temperatures, tighter clamping under high-current transients, and full SMT manufacturability-making it optimal for high-reliability industrial and automotive power rail protection.
Availability
SMCJ30A-TR is available at Aetrix Electronics and suitable for industrial SMPS input protection, automotive BCM power rails, telecom PoE midspan injectors, and factory automation I/O terminal blocks requiring stable component supply and long-term lifecycle assurance.
Supply support for SMCJ30A-TR 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, microcontroller, power, and sensing solutions for industrial, automotive, and consumer markets.
The SMCJ series belongs to ST's high-power TVS diode product line, engineered specifically for robust DC power rail protection in harsh electromagnetic environments where reliability under repeated surge stress is mandatory.
FAQ
What is the maximum clamping voltage of SMCJ30A-TR under a 10/1000 µs surge?
The maximum clamping voltage is 48.4 V at 32 A for a 10/1000 µs waveform, measured at 25 °C ambient. This value increases with junction temperature due to the 10⁻⁴/°C VBR coefficient, reaching approximately 50.2 V at 125 °C junction temperature.
Can SMCJ30A-TR be used in bidirectional signal lines?
No-SMCJ30A-TR is unidirectional and must be installed with cathode toward the protected positive rail. For bidirectional protection (e.g., RS-485, USB D+/D−), use the pin-compatible SMCJ30CA-TR variant, which features symmetrical breakdown in both polarities.
How does PCB copper area affect thermal performance?
Increasing copper area under each lead reduces thermal resistance: Rth(j-a) drops from ~120 °C/W with minimal copper to ~40 °C/W with 3.5 cm² per pad. This directly improves sustained surge handling and extends device lifetime during repetitive transient events.
Is SMCJ30A-TR compliant with RoHS and REACH?
Yes-SMCJ30A-TR carries ST's ECOPACK2 environmental compliance certification, meeting RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006, with lead-free matte tin plating and halogen-free epoxy molding compound.
SMCJ30A-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-214AB, SMC
- Series:
- SMCJ, TRANSIL™
- 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:
- 64.3V
- Current - Peak Pulse (10/1000µs):
- 156A (8/20µs)
- 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:
- SMC (DO-214AB)
SMCJ30A-TR FAQ
1.How can I place an order for SMCJ30A-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ30A-TR 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-TR reliable?
The price and inventory of SMCJ30A-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ30A-TR is usually 5 days.
3.What payment methods are accepted for SMCJ30A-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ30A-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ30A-TR?
SMCJ30A-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ30A-TR 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-TR?
For technical support, including SMCJ30A-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ30A-TR requirements.
6.How does Aetrix verify that SMCJ30A-TR is sourced from the original manufacturer or authorized distributors?
All SMCJ30A-TR 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-TR meets industry standards.
7.What is the process for return or replacement of SMCJ30A-TR?
All SMCJ30A-TR units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ30A-TR, 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-TR part is unused and in its original packaging.
Return procedure for SMCJ30A-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ30A-TR Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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onsemi
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Diodes Incorporated
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D12V0L1B2LP-7B
Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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