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STMicroelectronics SM15T30A
- Part No.:
- SM15T30A
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T30A.pdf
- Description:
- TVS DIODE 25.6VWM 53.5VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:2,894
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Product details
Overview
SM15T30A from STMicroelectronics is a unidirectional 1500 W transient voltage suppression diode in SMC package, designed for IEC 61000-4-2 ESD (30 kV air/contact) and IEC 61000-4-4 surge (4 kV level 4) protection of DC power rails and signal lines in industrial power supplies and telecom interfaces. It features 30 V standoff voltage (VRM), 41.5 V clamping voltage at 36 A (10/1000 µs), and 0.2 µA leakage at 25 °C.
For engineers reviewing the SM15T30A datasheet, SM15T30A pinout, SM15T30A application, or SM15T30A equivalent, this device is selected for high-reliability overvoltage protection where low leakage, high junction temperature operation (up to +150 °C), and stable clamping under repetitive surges are required - especially in SMPS input stages and PoE-powered equipment.
Technical Context
The SM15T30A uses planar silicon avalanche technology to achieve precise breakdown at 25.6–31.5 V (VBR min/max @ 1 mA), with dynamic resistance of 0.278 Ω enabling tight clamping during 10/1000 µs transients. Its thermal design supports 1250 W peak pulse power at Tj = 150 °C, validated per JEDEC JESD22-A108.
It complies with UL 497B (QVGQ2.E136224), IEC 61000-4-2 (30 kV), and IEC 61000-4-4 (4 kV), and meets IPC7531 footprint standards. The SMC package provides robust thermal dissipation on FR4 PCBs with recommended 3.14 cm² copper area per lead.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 30 V - Maximum continuous reverse operating voltage before conduction begins. |
| Breakdown Voltage (VBR) | 25.6–31.5 V @ 1 mA - Confirmed avalanche onset range ensuring reliable triggering margin. |
| Clamping Voltage (VCL) | 41.5 V @ 36 A, 10/1000 µs - Limits downstream voltage stress during surge events. |
| Peak Pulse Power (PPP) | 1500 W @ 10/1000 µs, Tamb = 25 °C - Sustains single high-energy transients without failure. |
| Leakage Current (IRM) | 0.2 µA @ VRM, 25 °C - Minimizes standby power loss and avoids false triggering in high-impedance circuits. |
| Junction Temperature Range | −55 to +150 °C - Enables operation in harsh environments including industrial motor drives and outdoor telecom gear. |
| ESD Withstand | 30 kV contact & air discharge (IEC 61000-4-2) - Exceeds level 4 requirements for front-panel and interface port protection. |
Pinout & Package
SM15T30A is housed in an SMC (DO-214AB) surface-mount package with two terminals: Cathode (marked side) and Anode. The package measures 5.55–6.25 mm × 7.75–8.15 mm × 2.45 mm max height and is optimized for automated reflow assembly per J-STD-020 MSL level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (marked end) | Surge current sink | Connected to protected line; conducts transient energy to ground when V > VBR. |
| Anode | Reference node | Typically tied to system ground or lower-potential rail; completes clamping path. |
Key Features
| Feature | Design Value |
|---|---|
| Low dynamic resistance | 0.278 Ω - Reduces clamping voltage rise under high-current surges, improving protection margin. |
| High-temperature stability | Rated for full 1500 W pulse power up to +150 °C junction temperature - ensures reliability in thermally constrained enclosures. |
| Ultra-low leakage | 0.2 µA @ 30 V, 25 °C - Prevents signal distortion in precision analog inputs and battery-backed circuits. |
| UL 497B certified | File QVGQ2.E136224 - Validates suitability for primary-side telecom and AC/DC adapter surge protection per safety standards. |
| JEDEC-compliant footprint | IPC7531 outline - Ensures mechanical compatibility and thermal performance across manufacturing partners. |
Applications
| Industrial SMPS Input Protection | Telecom Line Interface Protection |
|---|---|
Use Scenario: DC input stage of 24–48 V industrial switch-mode power supplies exposed to load dump and lightning-induced surges. IC Role / Device Role / Timing Role: Unidirectional TVS diode clamping positive transients on the input rail to protect upstream rectifiers and downstream controllers. Use Value: Clamps 36 A surges to ≤41.5 V, preventing MOSFET gate oxide damage and maintaining regulation during 10/1000 µs events. |
Use Scenario: Ethernet PHY interface or RS-485 bus lines in outdoor base stations subject to ESD and induced surges. IC Role / Device Role / Timing Role: Primary-level transient suppressor placed before common-mode chokes and receiver ICs. Use Value: Withstands 30 kV ESD and limits clamping voltage below 42 V, preserving signal integrity and avoiding latch-up in transceivers. |
| PoE-Powered Equipment | Automotive Body Control Module |
Use Scenario: 48 V power input of IEEE 802.3af/at powered devices (e.g., IP cameras, wireless APs) connected to unshielded cabling. IC Role / Device Role / Timing Role: First-line overvoltage protector on the PD's DC-DC converter input. Use Value: Handles 1500 W surges while maintaining <0.3 µA leakage, minimizing quiescent current draw and extending battery backup time. |
Use Scenario: 12 V supply rail in automotive BCM modules exposed to ISO 7637-2 pulse 1/2a/3a transients. IC Role / Device Role / Timing Role: Secondary surge clamp after primary LC filter, protecting microcontroller and CAN transceiver power domains. Use Value: Stable 30 V standoff and 41.5 V clamping ensure MCU reset logic remains functional during 100 V/50 ms load dump events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ30A (Bourns) | Same 30 V VRM, but 600 W rating (10/1000 µs); higher VCL = 48.4 V @ 12.3 A. | Limited to lower-energy surges; less suitable for 1500 W industrial transients. | Select when cost sensitivity outweighs peak power requirement and board space is constrained (SMB vs SMC). |
| 1.5KE30A (ON Semiconductor) | Through-hole DO-201 package; 1500 W rating but higher leakage (5 µA) and larger footprint. | Not suitable for high-density SMT layouts; requires wave soldering or hand assembly. | Choose only for legacy through-hole designs or where manual repairability is prioritized over thermal performance. |
Compared with SMBJ30A and 1.5KE30A, SM15T30A delivers superior thermal robustness in SMT form factor, lower leakage for low-power systems, and tighter clamping - making it optimal for modern industrial and telecom power rail protection where reliability and miniaturization intersect.
Availability
SM15T30A is available at Aetrix Electronics and suitable for industrial SMPS input protection, telecom line interface hardening, and PoE-powered equipment requiring stable component supply across extended temperature and surge stress conditions.
Supply support for SM15T30A 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, delivering intelligent power, analog, MEMS, and microcontroller solutions for industrial, automotive, and consumer markets.
SM15T30A belongs to ST's high-power TVS diode product line, engineered specifically for robust, low-leakage transient suppression in demanding power conversion and communication infrastructure applications.
FAQ
What is the maximum clamping voltage of SM15T30A under a 10/1000 µs surge?
The maximum clamping voltage (VCL) of SM15T30A is 41.5 V at 36 A for a 10/1000 µs waveform, measured at 25 °C ambient. This value increases with junction temperature due to the αT coefficient of 9.7 × 10⁻⁴/°C, reaching ~44.2 V at Tj = 125 °C.
Can SM15T30A be used in bidirectional signal line protection?
No - SM15T30A is unidirectional and must be connected with cathode toward the protected line. For bidirectional protection (e.g., RS-485, USB D+/D−), use the complementary SM15T30CA variant, which provides symmetrical clamping in both polarities.
Does SM15T30A meet automotive AEC-Q200 requirements?
SM15T30A is not AEC-Q200 qualified. It is rated for industrial temperature range (−55 to +150 °C) and meets IEC/UL safety standards, but lacks the stress testing and qualification documentation required for automotive-grade deployment.
What is the recommended PCB layout for optimal thermal performance?
ST recommends a minimum 3.14 cm² copper area under each lead on FR4 board (70 µm Cu thickness). Use thermal vias beneath the pad and connect to internal ground planes to reduce Rth(j-a) to ~60 °C/W, enabling sustained operation near Tj max.
SM15T30A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-214AB, SMC
- Series:
- SM15T, TRANSIL™
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 25.6V
- Voltage - Breakdown (Min):
- 28.5V
- Voltage - Clamping (Max) @ Ipp:
- 53.5V
- Current - Peak Pulse (10/1000µs):
- 187A (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
SM15T30A FAQ
1.How can I place an order for SM15T30A through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T30A 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 SM15T30A reliable?
The price and inventory of SM15T30A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM15T30A is usually 5 days.
3.What payment methods are accepted for SM15T30A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T30A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T30A?
SM15T30A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T30A 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 SM15T30A?
For technical support, including SM15T30A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T30A requirements.
6.How does Aetrix verify that SM15T30A is sourced from the original manufacturer or authorized distributors?
All SM15T30A 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 SM15T30A meets industry standards.
7.What is the process for return or replacement of SM15T30A?
All SM15T30A units undergo pre-shipment inspection (PSI). If there is an issue with SM15T30A, 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 SM15T30A part is unused and in its original packaging.
Return procedure for SM15T30A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM15T30A Tags
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