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STMicroelectronics SMC30J15A
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- Part No.:
- SMC30J15A
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMC30J15A.pdf
- Description:
- TVS DIODE 15VWM 24.4VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:2,873
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Product details
Overview
SMC30J15A from STMicroelectronics is a unidirectional 3000 W transient voltage suppression diode designed for primary-level ESD and surge protection in DC power rails and signal lines. It features a 15 V standoff voltage (VRM), 24.4 V clamping voltage at 32.5 A (10/1000 µs), and operates up to 175 °C junction temperature-enabling robust protection in industrial power supplies and automotive body electronics.
For engineers reviewing the SMC30J15A datasheet, SMC30J15A pinout, SMC30J15A application, or SMC30J15A equivalent, key selection criteria include its low 0.2 µA leakage at 25 °C, JEDEC-registered SMC package compatibility, IEC 61000-4-2 ±30 kV contact discharge compliance, and dynamic resistance of 15.1 mΩ-critical for minimizing voltage overshoot during fast transients.
Technical Context
The SMC30J15A employs planar silicon avalanche technology to deliver precise breakdown behavior with tight VBR tolerance (16.7–18.5 V at 1 mA) and predictable thermal derating via αT = 10.8 × 10⁻⁴/°C. Its unidirectional configuration supports anode-to-cathode surge conduction only, making it suitable for polarity-sensitive DC bus protection.
Clamping performance is defined by VCL = VBR(max) + RD × IPP, yielding 24.4 V at 32.5 A (10/1000 µs) and 48 V at 32.5 A (8/20 µs). Junction capacitance remains below 100 nF at 0 V bias (f = 1 MHz), preserving signal integrity in moderate-speed interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 3000 W (10/1000 µs); sustains repeated surges without degradation in SMPS input stages |
| Standoff Voltage (VRM) | 15 V; blocks normal operating voltage while triggering above 16.7 V breakdown threshold |
| Clamping Voltage (VCL) | 24.4 V at 32.5 A (10/1000 µs); limits downstream IC stress to safe levels during lightning-induced transients |
| Leakage Current (IRM) | 0.2 µA at 25 °C; minimizes standby power loss in battery-backed systems |
| Junction Temperature Range | −55 °C to +175 °C; enables deployment in under-hood automotive or high-ambient industrial environments |
| ESD Rating | ±30 kV contact discharge (IEC 61000-4-2); exceeds Level 4 immunity for human-body-model events |
| Dynamic Resistance (RD) | 15.1 mΩ; reduces clamping voltage rise under high di/dt, critical for fast-rising surges |
Pinout & Package
SMC30J15A uses the JEDEC-registered 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 standard reflow profiles (peak 240–245 °C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Surge current entry point (unidirectional) | Connected to protected line; conducts surge energy toward ground when voltage exceeds VBR |
| Cathode (K) | Surge current return path | Connected to system ground or low-impedance reference; completes conduction path during overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| Low clamping ratio (VCL/VBR ≈ 1.46) | Minimizes overvoltage exposure to downstream MOSFETs or controllers during 10/1000 µs surges |
| High-temperature operation (Tj max = 175 °C) | Supports placement near heat-generating components (e.g., power inductors, rectifiers) without derating |
| Ultra-low leakage (0.2 µA @ 25 °C) | Preserves battery life in always-on automotive modules and avoids false triggers in high-impedance sensing circuits |
| JEDEC-compliant SMC footprint | Ensures mechanical reliability and thermal performance on FR4 PCBs with 70 µm copper thickness |
| IEC 61000-4-4 Level 4 compliance (4 kV) | Validates robustness against repetitive fast transients in industrial control cabinet wiring |
Applications
| Industrial Power Supply Input Protection | Automotive Body Control Module (BCM) Power Rail |
|---|---|
Use Scenario: 24 V DC input stage of programmable logic controller (PLC) power supply exposed to load dump and inductive switching noise. IC Role / Device Role / Timing Role: Primary TVS clamp placed before input filter capacitor and upstream of DC-DC converter IC. Use Value: Limits transient voltage to ≤24.4 V during 32.5 A surges, preventing damage to input-stage MOSFETs and enabling reliable operation per IEC 61000-4-4. |
Use Scenario: 12 V battery rail feeding microcontroller, CAN transceiver, and LED drivers in door module. IC Role / Device Role / Timing Role: Unidirectional TVS on VBAT line, positioned adjacent to connector to intercept ESD before entering PCB. Use Value: Withstands ±30 kV contact discharge (IEC 61000-4-2) and clamps to 24.4 V, protecting 5 V LDOs and 3.3 V MCU I/O without latch-up. |
| Telecom DC Feeder Protection | Smart Meter AC/DC Auxiliary Supply |
Use Scenario: −48 V telecom power feed line entering remote radio unit enclosure, subject to lightning-induced surges. IC Role / Device Role / Timing Role: First-line TVS on DC input, paired with gas discharge tube (GDT) for coordinated protection. Use Value: 3000 W peak power rating handles 10/1000 µs surges up to 32.5 A, while 175 °C Tj rating ensures stability in sealed outdoor enclosures. |
Use Scenario: Auxiliary 12 V supply derived from mains AC via bridge rectifier and linear regulator in utility smart meter. IC Role / Device Role / Timing Role: TVS across rectified DC output to suppress switching spikes from relay coils and transformer leakage inductance. Use Value: Low 0.2 µA leakage prevents measurable error in metrology-grade current sensing; 15 V VRM matches nominal 12 V rail with margin. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ15A (STMicroelectronics) | Lower peak power (600 W), same VRM (15 V), higher VCL (24.4 V → 26.9 V at 23.1 A) | Not suitable for 3000 W surge environments; limited to secondary-side or low-energy signal lines | Select only if space constraints require SMB package and surge energy is <1000 W |
| 1.5KE15A (ON Semiconductor) | Higher leakage (5 µA), axial leaded DO-201 package, lower thermal mass, no MSL rating | Requires through-hole assembly; unsuitable for automated SMT production or high-reliability automotive use | Choose only for legacy through-hole designs where rework tolerance outweighs SMT efficiency |
Compared with SMBJ15A and 1.5KE15A, SMC30J15A delivers 5× higher surge power handling in an MSL-1 SMT package with 25× lower leakage-making it the sole option for high-energy, high-reliability, automated production applications requiring 3000 W clamping.
Availability
SMC30J15A is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, telecom DC feeders, and smart meter auxiliary supplies requiring stable component supply across multi-year production cycles.
Supply support for SMC30J15A 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 primary-level surge immunity in harsh-environment DC power systems where reliability, thermal resilience, and IEC/ISO compliance are mandatory.
FAQ
What is the maximum surge current SMC30J15A can handle at 10/1000 µs?
SMC30J15A is rated for 32.5 A peak pulse current at 10/1000 µs, corresponding to its 3000 W peak pulse power dissipation at 24.4 V clamping voltage. This value is verified per IEC 61000-4-5 test conditions and reflects worst-case conduction capability before thermal runaway.
Is SMC30J15A suitable for bidirectional signal line protection?
No-SMC30J15A is unidirectional and conducts only from anode to cathode. For bidirectional protection (e.g., RS-485, USB D+/D−), the SMC30J15CA variant must be used, which provides symmetrical clamping in both polarities with identical electrical parameters.
How does junction temperature affect clamping voltage in SMC30J15A?
VCL increases with junction temperature at a coefficient αT = 10.8 × 10⁻⁴/°C. At 150 °C, VCL rises ~1.35 V above its 25 °C value (24.4 V), reaching ~25.75 V-still within safe limits for 24 V systems with appropriate design margin.
Does SMC30J15A meet automotive AEC-Q200 requirements?
SMC30J15A is not AEC-Q200 qualified. While it operates up to 175 °C and meets IEC 61000-4-2/4-4, ST offers the Automotive-grade SMAJ15A (AEC-Q200 Grade 1) for qualified automotive applications-requiring separate qualification testing and traceability documentation.
SMC30J15A 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):
- 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
SMC30J15A FAQ
1.How can I place an order for SMC30J15A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMC30J15A 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 SMC30J15A reliable?
The price and inventory of SMC30J15A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMC30J15A is usually 5 days.
3.What payment methods are accepted for SMC30J15A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMC30J15A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMC30J15A?
SMC30J15A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMC30J15A 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 SMC30J15A?
For technical support, including SMC30J15A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMC30J15A requirements.
6.How does Aetrix verify that SMC30J15A is sourced from the original manufacturer or authorized distributors?
All SMC30J15A 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 SMC30J15A meets industry standards.
7.What is the process for return or replacement of SMC30J15A?
All SMC30J15A units undergo pre-shipment inspection (PSI). If there is an issue with SMC30J15A, 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 SMC30J15A part is unused and in its original packaging.
Return procedure for SMC30J15A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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