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STMicroelectronics SMC30J15CA
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- Part No.:
- SMC30J15CA
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC30J15CA.pdf
- Description:
- TVS DIODE 15VWM 24.4VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
SMC30J15CA from STMicroelectronics is a bidirectional transient voltage suppression (TVS) diode designed for high-energy ESD and surge protection in power rails and signal lines. It delivers 3000 W peak pulse power (10/1000 µs), clamps at 24.4 V (max) under 123 A surge, and operates up to 175 °C junction temperature - enabling robust protection in industrial power supplies, automotive ECUs, and telecom interfaces.
For engineers reviewing the SMC30J15CA datasheet, SMC30J15CA pinout, SMC30J15CA application, or SMC30J15CA equivalent, key selection criteria include bidirectional standoff voltage (15 V), low leakage (0.2 µA at 25 °C), JEDEC-registered SMC package compatibility, and IEC 61000-4-2 ±30 kV contact/air discharge compliance.
Technical Context
This TVS diode uses planar silicon avalanche technology to achieve precise breakdown symmetry in both directions, ensuring balanced clamping during positive and negative transients. Its dynamic resistance of 15.1 mΩ (typ.) enables fast response (<1 ns) and minimal voltage overshoot under 8/20 µs surges up to 32.5 A.
The device integrates thermal stability via a 175 °C maximum junction temperature rating and exhibits predictable VBR drift (αT = 8.8 × 10−4/°C), allowing accurate clamping voltage prediction across operating temperatures using VCL(Tj) = VCL(25 °C) × [1 + αT(Tj − 25)].
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 15 V - Maximum continuous reverse working voltage before conduction begins; defines safe operating margin for 12 V nominal systems. |
| Breakdown Voltage (VBR) | 16.7–18.5 V at 1 mA - Tight tolerance ensures consistent turn-on across production lots and temperature range. |
| Clamping Voltage (VCL) | 24.4 V max at 123 A (10/1000 µs) - Limits downstream voltage stress to protect 24 V-rated ICs and MOSFETs. |
| Peak Pulse Power | 3000 W (10/1000 µs); up to 40 kW (8/20 µs) - Supports high-energy lightning-induced surges per IEC 61000-4-4 Level 4 (4 kV). |
| Leakage Current (IR) | 0.2 µA max at 15 V and 25 °C - Minimizes standby power loss in battery-backed or low-power sensor nodes. |
| Junction Temperature Range | −55 °C to +175 °C - Enables deployment 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 without external shielding or filtering. |
Pinout & Package
SMC30J15CA is housed in a JEDEC-registered SMC (DO-214AB) surface-mount package with matte tin-plated leads, optimized for automated assembly and high thermal dissipation on FR4 PCBs. The symmetrical bidirectional structure requires no polarity orientation during placement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (Bidirectional) | Surge current path (reversible) | Both terminals function identically - either can serve as input or return; eliminates orientation errors in layout. |
| Cathode/Anode (Bidirectional) | Surge current path (reversible) | Enables clamping of both positive and negative transients without discrete back-to-back diode configuration. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Eliminates need for dual-diode arrangements in AC-coupled or floating signal paths (e.g., RS-485, CAN bus). |
| Low dynamic resistance | 15.1 mΩ typical - reduces clamping voltage rise under high di/dt events, preserving protected circuit margins. |
| High-temperature operation | Rated to 175 °C junction - supports placement near heat-generating components (e.g., DC-DC inductors, MOSFETs) without derating. |
| JEDEC-compliant footprint | Matches IPC-7531 and JEDEC MO-213AA - ensures drop-in compatibility with existing SMC land patterns and reflow profiles. |
| Whisker-resistant plating | JESD-201 Class 2 - prevents tin whisker growth in long-life industrial and automotive applications. |
Applications
| Industrial Power Supply Input Protection | Automotive Body Control Module (BCM) I/O |
|---|---|
|
Use Scenario: Protecting 24 V DC input rails of programmable logic controllers (PLCs) against load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Primary surge clamp placed upstream of DC-DC converters and microcontrollers. Use Value: Clamps 123 A transients to ≤24.4 V within nanoseconds, preventing latch-up or gate oxide damage in downstream SiC MOSFET drivers. |
Use Scenario: Safeguarding LIN bus and sensor inputs (e.g., ambient temperature, door position) in BCMs exposed to ESD during service operations. IC Role / Device Role / Timing Role: Bidirectional ESD suppressor on unidirectional analog and digital I/O pins. Use Value: Withstands ±30 kV contact discharge without degradation, maintaining signal integrity and avoiding false wake-up events. |
| Telecom Ethernet PHY Interface | Renewable Energy Inverter DC Link Monitoring |
|
Use Scenario: Protecting RJ45 magnetics and PHY ICs in PoE-powered switches from induced surges on data lines. IC Role / Device Role / Timing Role: Secondary-level TVS on transformer-coupled differential pairs (e.g., TX+/TX−). Use Value: Low capacitance (<100 pF at 1 V) avoids signal integrity loss at 100BASE-TX speeds while delivering 3000 W surge handling. |
Use Scenario: Shielding voltage-sense circuits monitoring 400–800 V DC link in solar inverters from switching transients and grid faults. IC Role / Device Role / Timing Role: High-reliability clamping element on isolated ADC front-end inputs. Use Value: Stable 15 V standoff and 175 °C rating ensure accuracy and longevity despite thermal cycling near power modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ15CA (ON Semiconductor) | Same 15 V VRM, but lower 600 W peak power (10/1000 µs); higher VCL = 24.4 V @ 24.4 A. | Limited to lower-energy surges; unsuitable for IEC 61000-4-4 Level 4 or automotive load dump. | Select only when space constraints require SMB package and surge energy remains below 600 W. |
| 1.5KE15CA (Littelfuse) | Through-hole DO-201 package; 1500 W peak power; VCL = 24.4 V @ 61.5 A; higher leakage (5 µA). | Not suitable for high-density SMT designs; thermal performance inferior due to lead-frame construction. | Choose only for legacy through-hole boards where rework flexibility outweighs power density needs. |
Compared with SMBJ15CA and 1.5KE15CA, SMC30J15CA provides triple the surge power handling in the same SMC footprint, tighter leakage control, and guaranteed 175 °C operation - making it the preferred choice for next-generation industrial and automotive electronics requiring compact, high-reliability transient suppression.
Availability
SMC30J15CA is available at Aetrix Electronics and suitable for industrial power supply input protection, automotive body control module I/O, telecom Ethernet PHY interface, and renewable energy inverter DC link monitoring requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMC30J15CA 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 automotive, industrial, and power management solutions with vertical manufacturing capabilities and broad IP portfolio.
The SMC30J series belongs to ST's high-power TVS diode product line, engineered specifically for robust, high-temperature ESD and surge protection in harsh-environment applications where reliability and consistency are non-negotiable.
FAQ
What is the maximum clamping voltage of SMC30J15CA under a 10/1000 µs surge?
The maximum clamping voltage (VCL) is 24.4 V when subjected to a 123 A peak pulse (10/1000 µs), as specified in Table 2 of DS8598 Rev 8. This value is measured at Tamb = 25 °C and represents the upper limit of voltage seen by protected circuitry during worst-case surge conditions.
Is SMC30J15CA compatible with lead-free reflow soldering processes?
Yes - SMC30J15CA complies with J-STD-020 MSL Level 1 and is qualified for standard lead-free reflow profiles, including ST's recommended peak temperature of 240–245 °C for 2–3 seconds. Its matte tin plating and JEDEC-registered SMC package ensure reliable wetting and intermetallic formation.
How does the bidirectional design affect PCB layout compared to unidirectional TVS diodes?
SMC30J15CA's symmetrical bidirectional structure eliminates polarity marking and orientation constraints - both terminals are functionally identical. This simplifies layout, reduces assembly errors, and allows flexible routing in AC-coupled or floating interfaces like RS-485, CAN FD, or differential sensor lines without dedicated anode/cathode assignment.
Can SMC30J15CA be used in parallel to increase surge current handling?
No - paralleling TVS diodes is not recommended due to mismatched dynamic resistance and breakdown voltage, which causes uneven current sharing and potential thermal runaway. For higher current capability, select a higher-rated part (e.g., SMC30J18CA or SMC30J20CA) or use staged protection with upstream current-limiting elements.
SMC30J15CA 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:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 15V
- Voltage - Breakdown (Min):
- 16.7V
- Voltage - Clamping (Max) @ Ipp:
- 24.4V
- Current - Peak Pulse (10/1000µs):
- 123A
- 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
SMC30J15CA FAQ
1.How can I place an order for SMC30J15CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC30J15CA 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 SMC30J15CA reliable?
The price and inventory of SMC30J15CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMC30J15CA is usually 5 days.
3.What payment methods are accepted for SMC30J15CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC30J15CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC30J15CA?
SMC30J15CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC30J15CA 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 SMC30J15CA?
For technical support, including SMC30J15CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC30J15CA requirements.
6.How does Aetrix verify that SMC30J15CA is sourced from the original manufacturer or authorized distributors?
All SMC30J15CA 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 SMC30J15CA meets industry standards.
7.What is the process for return or replacement of SMC30J15CA?
All SMC30J15CA units undergo pre-shipment inspection (PSI). If there is an issue with SMC30J15CA, 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 SMC30J15CA part is unused and in its original packaging.
Return procedure for SMC30J15CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMC30J15CA Tags
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