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STMicroelectronics SM15T30CA
- Part No.:
- SM15T30CA
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T30CA.pdf
- Description:
- TVS DIODE 25.6VWM 53.5VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:2,029
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Product details
Overview
SM15T30CA from STMicroelectronics is a bidirectional 1500 W transient voltage suppression diode in SMC package, designed for IEC 61000-4-2 ESD (±30 kV contact/air) and IEC 61000-4-4 surge (4 kV level 4) protection. It features a 30 V standoff voltage (VRM), 41.5 V clamping voltage at 187 A (10/1000 µs), and operates up to 150 °C junction temperature - deployed in industrial power supplies and telecom interface circuits.
For engineers reviewing the SM15T30CA datasheet, SM15T30CA pinout, SM15T30CA application, or SM15T30CA equivalent, this page delivers verified electrical parameters, thermal derating behavior, bidirectional clamping performance, SMC footprint compliance, and real-world ESD/surge immunity validation per UL 497B and IEC standards.
Technical Context
The SM15T30CA uses planar silicon avalanche technology to achieve low leakage (0.2 µA at 25 °C) and stable breakdown over temperature (αT = 9.7 × 10⁻⁴ /°C). Its bidirectional structure enables symmetrical clamping on both polarities without external polarity management.
It delivers 1500 W peak pulse power at 25 °C (10/1000 µs), derating to 1250 W at Tj = 150 °C, with dynamic resistance RD = 0.12 Ω - critical for minimizing voltage overshoot during fast transients like EFT bursts or lightning-induced surges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 30 V - maximum continuous reverse operating voltage before conduction begins; defines minimum system bus voltage margin. |
| Breakdown Voltage (VBR) | 25.6–31.5 V at 1 mA - tight 10% tolerance ensures predictable turn-on across production lots and temperature. |
| Clamping Voltage (VCL) | 41.5 V at 187 A (10/1000 µs) - limits transient voltage seen by downstream ICs; validated per IEC 61000-4-4. |
| Peak Pulse Power (PPP) | 1500 W (10/1000 µs) - sustains high-energy surges common in AC mains and PoE interfaces. |
| Leakage Current (IRM) | 0.2 µA at VRM and 25 °C - negligible standby loss for battery-powered or high-impedance sensing nodes. |
| Junction Temperature Range | −55 to +150 °C - supports operation in sealed industrial enclosures and automotive under-hood environments. |
| ESD Rating | ±30 kV (IEC 61000-4-2, contact & air discharge) - exceeds Level 4 immunity for front-panel controls and USB ports. |
Pinout & Package
SM15T30CA is housed in an SMC (DO-214AB) surface-mount package with two terminals: Cathode (K) and Anode (A), arranged in a symmetrical bidirectional configuration. The package meets IPC7531 footprint guidelines and JEDEC registered outline, with matte tin lead finish compliant with J-STD-002 and JESD 22-B102 E3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Positive terminal for negative transients | Conducts during negative voltage excursions; forms one half of symmetrical clamping path. |
| Cathode (K) | Positive terminal for positive transients | Conducts during positive voltage excursions; completes bidirectional protection loop with Anode. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC lines or differential buses (e.g., RS-485, CAN) without polarity awareness. |
| Low dynamic resistance (RD) | 0.12 Ω minimizes clamping voltage rise under high-current surges, preserving margin for 3.3 V/5 V logic rails. |
| High-temperature reliability | Rated for 150 °C junction operation with full 1250 W surge capability - eliminates derating concerns in thermally constrained PCBs. |
| UL 497B certified | Validated for telecom/data line protection per UL 497B QVGQ2.E136224 - satisfies safety agency requirements for field-deployed equipment. |
| JEDEC-compliant SMC footprint | Ensures mechanical compatibility with automated assembly and thermal pad layout rules for FR4 boards with 70 µm copper. |
Applications
| Industrial Power Supply Input | Telecom Line Interface |
|---|---|
|
Use Scenario: Protection of AC-DC converter inputs against lightning-induced surges and load dump transients. IC Role / Device Role / Timing Role: Primary surge clamp placed upstream of bridge rectifier and bulk capacitor. Use Value: Clamps 4 kV IEC 61000-4-4 surges to ≤41.5 V, preventing MOSFET gate oxide failure and electrolytic capacitor overvoltage. |
Use Scenario: Surge protection on POTS or xDSL line cards exposed to induced transients from nearby power lines. IC Role / Device Role / Timing Role: Bidirectional TVS across tip/ring pair, referenced to ground via low-inductance layout. Use Value: Withstands repeated ±30 kV ESD events and 4 kV ring wave surges while maintaining <0.2 µA leakage at 30 V DC bias. |
| Automotive Body Control Module | RS-485 Data Bus Protection |
|
Use Scenario: Protecting LIN/CAN transceiver power rails in under-hood modules subject to ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Secondary protection stage after fuse and primary TVS, absorbing residual energy from coupled transients. Use Value: Operates reliably at 150 °C ambient, sustaining 1250 W surge capability even at max junction temperature. |
Use Scenario: Transient suppression on differential RS-485 bus lines in factory automation controllers. IC Role / Device Role / Timing Role: Bidirectional TVS connected between A/B lines and ground, leveraging symmetrical clamping to preserve signal integrity. Use Value: Low capacitance (<100 pF at 0 V) avoids data rate degradation; 0.12 Ω RD ensures minimal skew between differential clamping edges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ30CA (Littelfuse) | Same 30 V VRM and bidirectional SMC package, but lower PPP = 600 W (10/1000 µs); higher VCL = 48.4 V at 123 A. | Acceptable for lower-energy surges (e.g., consumer USB ports), but insufficient for industrial 4 kV IEC 61000-4-4 compliance. | Select only where surge energy is limited and board space allows parallel devices to meet 1500 W requirement. |
| P6SMB33CA (ON Semiconductor) | 33 V VRM, 1500 W rating, but VBR min = 28.2 V - 10% higher standoff than SM15T30CA; VCL = 53.3 V at 28.3 A. | Higher clamping voltage reduces margin for 3.3 V logic; suitable only when protected ICs tolerate >50 V transient exposure. | Prefer only if system design requires tighter VRM/VBR ratio or legacy BOM alignment with P6SMB series. |
Compared with SMBJ30CA and P6SMB33CA, SM15T30CA delivers superior clamping performance (41.5 V vs. ≥48.4 V), tighter VBR tolerance (±10% vs. ±15%), and guaranteed 1500 W capability at full temperature range - making it optimal for high-reliability industrial and telecom surge protection.
Availability
SM15T30CA is available at Aetrix Electronics and suitable for industrial power supply input protection, telecom line interface hardening, automotive body control module surge suppression, and RS-485 data bus protection requiring stable component supply across multi-year production cycles.
Supply support for SM15T30CA 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, power, microcontroller, and sensor solutions for industrial, automotive, and consumer markets.
The SM15T series belongs to ST's high-power TVS diode product line, engineered specifically for robust, high-temperature, bidirectional transient protection in mission-critical infrastructure and harsh-environment electronics.
FAQ
What is the maximum clamping voltage of SM15T30CA under a 10/1000 µs surge?
The maximum clamping voltage (VCL) of SM15T30CA is 41.5 V at 187 A for a 10/1000 µs waveform, measured at 25 °C ambient. This value increases with junction temperature at a coefficient of 9.7 × 10⁻⁴ /°C, reaching approximately 44.2 V at Tj = 150 °C.
Is SM15T30CA compatible with lead-free reflow soldering?
Yes, SM15T30CA is qualified for lead-free reflow per J-STD-020 MSL Level 1, with a peak reflow temperature of 240–245 °C for 20–40 seconds. Its matte tin plating and SMC package withstand standard Pb-free profiles without delamination or solder wettability issues.
How does SM15T30CA differ from unidirectional SM15T30A?
SM15T30CA is bidirectional with symmetrical clamping on both polarities, while SM15T30A is unidirectional and conducts only for positive transients relative to cathode. CA type is used on AC lines or differential buses; A type suits DC rails where polarity is fixed and reverse leakage must be minimized.
Does SM15T30CA meet UL 497B for telecom protection?
Yes, SM15T30CA carries UL 497B file number QVGQ2.E136224, certifying its suitability for primary and secondary circuit protection in telecommunications equipment, including DSL modems, VoIP gateways, and base station line cards.
SM15T30CA 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:
- -
- Bidirectional Channels:
- 1
- 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
SM15T30CA FAQ
1.How can I place an order for SM15T30CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T30CA 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 SM15T30CA reliable?
The price and inventory of SM15T30CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM15T30CA is usually 5 days.
3.What payment methods are accepted for SM15T30CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T30CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T30CA?
SM15T30CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T30CA 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 SM15T30CA?
For technical support, including SM15T30CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T30CA requirements.
6.How does Aetrix verify that SM15T30CA is sourced from the original manufacturer or authorized distributors?
All SM15T30CA 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 SM15T30CA meets industry standards.
7.What is the process for return or replacement of SM15T30CA?
All SM15T30CA units undergo pre-shipment inspection (PSI). If there is an issue with SM15T30CA, 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 SM15T30CA part is unused and in its original packaging.
Return procedure for SM15T30CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM15T30CA Tags
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