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STMicroelectronics SMC30J30A
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- Part No.:
- SMC30J30A
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC30J30A.pdf
- Description:
- TVS DIODE 30VWM 48.4VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:2,643
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Product details
Overview
SMC30J30A from STMicroelectronics is a unidirectional transient voltage suppression (TVS) diode designed for robust electrostatic discharge (ESD) and surge protection in power rails and signal lines. It delivers 3000 W peak pulse power (10/1000 µs), clamps at 48.4 V (max) under 185 A surge current, and operates up to 175 °C junction temperature - enabling use in industrial power supplies, automotive body electronics, and telecom front-end interfaces.
For engineers reviewing the SMC30J30A datasheet, SMC30J30A pinout, SMC30J30A application, or SMC30J30A equivalent, key selection criteria include its 30 V standoff voltage (VRM), low 0.2 µA leakage at 25 °C, JEDEC-registered SMC package compatibility, and IEC 61000-4-2 ±30 kV contact/air discharge compliance.
Technical Context
This TVS diode employs planar silicon junction technology to achieve stable clamping performance across wide temperature ranges (–55 °C to +175 °C) and high-reliability operation in thermally demanding environments. Its dynamic resistance of 48.2 mΩ ensures minimal voltage overshoot during fast transients.
The device is optimized for unidirectional DC rail protection: it conducts only when reverse-biased beyond its breakdown voltage (33.3–36.9 V), with forward conduction limited to ≤1.8 V at 100 A (Tj = 175 °C). Its thermal impedance (junction-to-ambient) is 100 °C/W on standard FR4 PCB footprint, supporting sustained surge handling without thermal runaway.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 30 V - maximum continuous reverse operating voltage before significant leakage; sets minimum system rail rating for safe integration. |
| Breakdown Voltage (VBR) | 33.3–36.9 V at 1 mA - precise threshold where avalanche conduction begins; enables predictable overvoltage triggering. |
| Clamping Voltage (VCL) | 48.4 V max at 185 A (10/1000 µs) - limits downstream component stress during surge events; critical for IC-level ESD survivability. |
| Peak Pulse Power | 3000 W (10/1000 µs) - defines energy-handling capability for lightning-induced surges per IEC 61000-4-4 Level 4 (4 kV). |
| Leakage Current (IRM) | 0.2 µA max at VRM and 25 °C - ensures negligible standby power loss and signal integrity in high-impedance circuits. |
| Junction Temperature Range | –55 °C to +175 °C - supports operation in under-hood automotive, industrial motor drives, and outdoor telecom equipment. |
| ESD Robustness | ±30 kV contact & air discharge (IEC 61000-4-2) - exceeds Level 4 requirements, eliminating need for secondary ESD stages in many designs. |
Pinout & Package
SMC30J30A uses the JEDEC-standardized SMC (DO-214AB) surface-mount package: 7.75–8.15 mm length × 5.55–6.25 mm width × 2.45 mm height, matte tin-plated leads, MSL Level 1, compatible with IPC-7531 footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Marked Band) | Surge Current Sink | Connected to protected line; conducts avalanche current to ground during overvoltage events. |
| Anode | Reference / Ground Return | Tied to system ground or low-impedance return path; completes conduction loop during clamping. |
Key Features
| Feature | Design Value |
|---|---|
| High-Temperature Operation | Rated for continuous operation up to +175 °C junction temperature - eliminates derating concerns in enclosed power modules. |
| Low Dynamic Resistance | 48.2 mΩ - minimizes clamping voltage rise under high di/dt surges, improving protection margin for sensitive downstream ICs. |
| JEDEC-Registered Package | SMC (DO-214AB) outline - ensures mechanical and thermal compatibility with automated assembly and existing board layouts. |
| UL94 V0 Flame Rating | Self-extinguishing epoxy housing - meets safety requirements for industrial and consumer end-equipment certifications. |
| Whisker-Resistant Finish | JESD-201 Class 2 matte tin plating - prevents tin whisker growth in long-life applications such as automotive ECUs and base stations. |
Applications
| Industrial Power Supply Input Protection | Automotive Body Control Module (BCM) CAN Bus Lines |
|---|---|
Use Scenario: 24 V DC input stage of programmable logic controller (PLC) power supply exposed to load dump and inductive switching transients. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between input rail and chassis ground to limit voltage excursions below 50 V during 3000 W surges. Use Value: Prevents damage to upstream rectifier diodes and downstream DC-DC controllers by clamping within 48.4 V at 185 A, while maintaining <0.2 µA leakage at nominal 24 V. |
Use Scenario: Protection of CAN_H/CAN_L differential pair in vehicle BCM against ESD events during connector mating/unmating. IC Role / Device Role / Timing Role: Dual unidirectional TVS devices (one per line) referenced to battery ground, absorbing ±30 kV contact discharge per IEC 61000-4-2. Use Value: Ensures CAN transceiver survival without signal distortion, leveraging low capacitance (<100 pF) and sub-µA leakage to preserve bus timing and bit error rate. |
| Telecom AC-DC Adapter Secondary Side | Smart Meter Power Input Stage |
Use Scenario: Output rail protection in isolated 12 V/5 V telecom adapter subject to conducted surges per IEC 61000-4-4 Level 4. IC Role / Device Role / Timing Role: Standoff-rated TVS on regulated output to suppress coupling from primary-side transients and external line noise. Use Value: Maintains tight regulation margin (30 V VRM vs. 12 V rail) while delivering 3000 W surge immunity - enabling single-stage protection without additional filtering. |
Use Scenario: M-Bus or PLC communication interface input in utility smart meter exposed to field ESD and induced surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 3.3 V or 5 V logic supply derived from mains-connected power stage. Use Value: Guarantees meter firmware stability by limiting transient overvoltage to <48.4 V, with 175 °C operation supporting sealed, heat-trapped enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ30A (Bourns) | Same VRM (30 V), lower PPP (600 W), higher VCL (53.3 V @ 11.8 A), SMB package (smaller footprint, lower thermal mass). | Limited to lower-energy surges; unsuitable for IEC 61000-4-4 Level 4 or 3000 W transients. | Select only if space-constrained and surge threat is limited to ESD-only (IEC 61000-4-2) with no lightning or inductive coupling risk. |
| 1.5KE30A (ON Semiconductor) | Higher VRM tolerance (30 V), same PPP (3000 W), but axial DO-201 package - incompatible with SMT assembly and higher thermal resistance (~150 °C/W). | Requires through-hole layout redesign; not suitable for high-density or reflow-soldered boards. | Choose only for legacy through-hole systems where manual assembly and thermal derating are acceptable. |
Compared with SMBJ30A and 1.5KE30A, SMC30J30A uniquely combines 3000 W surge rating, SMT-compatible SMC packaging, 175 °C operation, and ±30 kV ESD immunity - making it the only option qualified for high-reliability, space-constrained, thermally aggressive applications like automotive BCMs and industrial PLCs.
Availability
SMC30J30A is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, telecom adapters, and smart metering systems requiring stable component supply, long-lifecycle support, and full compliance with IEC 61000-4-2/4-4 standards.
Supply support for SMC30J30A 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, specializing in power management, analog, MEMS, and microcontrollers for industrial, automotive, and consumer markets.
The SMC30J series belongs to ST's high-power TVS portfolio, engineered specifically for robust, high-temperature, high-energy transient suppression in mission-critical power and interface circuits - emphasizing reliability over cost-driven compromises.
FAQ
What is the maximum clamping voltage of SMC30J30A under a 10/1000 µs surge?
The maximum clamping voltage (VCL) of SMC30J30A is 48.4 V when subjected to an 185 A peak pulse current with a 10/1000 µs waveform. This value is measured at Tj = 25 °C and represents the upper bound of voltage seen by protected circuitry during worst-case surge conditions.
Can SMC30J30A be used in bidirectional signal line protection?
No - SMC30J30A is a unidirectional TVS diode, intended only for DC rail or single-polarity signal protection. For bidirectional applications such as USB, RS-485, or CAN bus, the bidirectional variant SMC30J30CA must be used, which provides symmetrical clamping in both polarities.
Does SMC30J30A meet automotive AEC-Q200 requirements?
SMC30J30A is not AEC-Q200 qualified. While it operates up to 175 °C and meets IEC 61000-4-2/4-4, ST does not list it in their AEC-Q200-certified TVS portfolio. For automotive-grade applications requiring qualification, consider ST's Automotive Qualified SM712 or SMAJ33A-Q variants instead.
What is the recommended PCB footprint for SMC30J30A?
The recommended footprint follows IPC-7531 and JEDEC MO-136 specifications: pad length 5.11 mm, pad width 3.14 mm, center-to-center spacing 8.19 mm, with 1.54 mm solder mask opening per pad. Copper area ≥2 cm² per pad improves thermal dissipation and surge current handling.
SMC30J30A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-214AB, SMC
- Series:
- SMC30J
- 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):
- 62A
- Power - Peak Pulse:
- 3000W (3kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMC
SMC30J30A FAQ
1.How can I place an order for SMC30J30A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC30J30A 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 SMC30J30A reliable?
The price and inventory of SMC30J30A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMC30J30A is usually 5 days.
3.What payment methods are accepted for SMC30J30A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC30J30A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC30J30A?
SMC30J30A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC30J30A 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 SMC30J30A?
For technical support, including SMC30J30A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC30J30A requirements.
6.How does Aetrix verify that SMC30J30A is sourced from the original manufacturer or authorized distributors?
All SMC30J30A 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 SMC30J30A meets industry standards.
7.What is the process for return or replacement of SMC30J30A?
All SMC30J30A units undergo pre-shipment inspection (PSI). If there is an issue with SMC30J30A, 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 SMC30J30A part is unused and in its original packaging.
Return procedure for SMC30J30A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMC30J30A Tags
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