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STMicroelectronics SM15T15CA
- Part No.:
- SM15T15CA
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T15CA.pdf
- Description:
- TVS DIODE 12.8VWM 27.2VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:2,719
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Product details
Overview
SM15T15CA from STMicroelectronics is a bidirectional transient voltage suppression (TVS) diode in SMC package, designed for IEC 61000-4-2 ESD protection (30 kV air/contact) and IEC 61000-4-4 surge immunity (4 kV level 4). It features a 15 V standoff voltage (VRM), 21.2 V clamping voltage at 368 A (8/20 µs), and 1500 W peak pulse power (10/1000 µs), enabling robust protection of Ethernet PHYs, USB interfaces, and industrial I/O lines.
For engineers reviewing the SM15T15CA datasheet, SM15T15CA pinout, SM15T15CA application, or SM15T15CA equivalent, key selection criteria include bidirectional clamping behavior, low leakage (<1 µA at VRM), high junction temperature capability (150 °C), and compatibility with FR4 PCB footprints per IPC7531.
Technical Context
This device operates as a voltage-clamped shunt protector: under transient overvoltage, it avalanches to divert current away from downstream circuitry while maintaining a controlled clamping voltage (VCL = 21.2 V @ 368 A, 8/20 µs). Its planar silicon junction enables stable leakage performance across temperature (IR ≤ 1 µA up to 125 °C).
The bidirectional configuration supports AC-coupled signal lines without polarity concerns; its dynamic resistance (RD = 0.031 Ω) ensures minimal voltage overshoot during fast transients, and thermal impedance (Zth(j-a)) is optimized for standard SMC footprint on 70 µm Cu FR4.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 15 V - Maximum continuous reverse working voltage before significant leakage begins; defines operating margin below clamping threshold. |
| Clamping Voltage (VCL) | 21.2 V @ 368 A (8/20 µs) - Peak voltage seen by protected circuit during worst-case surge; determines minimum safe IC withstand rating. |
| Peak Pulse Power | 1500 W (10/1000 µs) - Sustained energy-handling capacity for lightning-induced surges; derates to 1250 W at 150 °C junction. |
| Leakage Current (IRM) | 0.2 µA @ 15 V, 25 °C - Ultra-low DC leakage preserves signal integrity and battery life in always-on interfaces. |
| Junction Temp Range | –55 °C to +150 °C - Enables deployment in automotive engine bays, industrial PLCs, and outdoor telecom equipment. |
| ESD Rating | ±30 kV (IEC 61000-4-2, contact & air) - Exceeds level 4 immunity; eliminates need for secondary ESD stages in front-end protection. |
Pinout & Package
SM15T15CA uses the industry-standard SMC (DO-214AB) surface-mount package: 7.75–8.15 mm length, 5.55–6.25 mm width, 2.45 mm max height, matte tin-plated leads compliant with J-STD-002 and JEDEC MO-136.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Marked Band) | Reference terminal for bidirectional operation | Identifies polarity marking; in CA devices, both terminals are symmetrical-no functional anode/cathode distinction under AC stress. |
| Anode (Opposite Band) | Reference terminal for bidirectional operation | Electrically identical to cathode pin; bidirectional symmetry allows placement without orientation constraints on PCB. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled lines (e.g., RS-485, CAN, Ethernet pairs) without polarity-sensitive layout. |
| Low dynamic resistance | RD = 0.031 Ω ensures <1 V overshoot during 368 A transients, reducing stress on downstream TVS or IC input structures. |
| High-temperature reliability | Rated for continuous operation at Tj = 150 °C; maintains 1250 W surge capability at max junction temp for industrial thermal environments. |
| UL 497B certified | QVGQ2.E136224 listing confirms suitability for primary-side telecom and data line protection per safety standards. |
Applications
| Industrial I/O Protection | Automotive Body Control |
|---|---|
Use Scenario: Protecting 24 V sensor inputs and digital outputs in PLC modules against load dump and inductive switching transients. IC Role / Device Role / Timing Role: Shunt clamping element placed at connector entry point; responds within nanoseconds to suppress >100 V spikes. Use Value: Prevents latch-up or permanent damage to microcontroller GPIOs and analog front-ends rated for ≤36 V absolute maximum. | Use Scenario: Safeguarding LIN bus transceivers and door module switches exposed to ISO 7637-2 pulse 1/2a/5a. IC Role / Device Role / Timing Role: Primary transient suppressor on LIN data line; clamps to 21.2 V to keep transceiver VCC-referenced inputs within safe operating range. Use Value: Eliminates need for series resistors or secondary TVS, reducing BOM count and board space in space-constrained modules. |
| USB 2.0 Port Protection | RS-485 Transceiver Interface |
Use Scenario: Guarding D+ and D− lines of embedded USB host ports against ESD events during hot-plug insertion. IC Role / Device Role / Timing Role: Low-capacitance (≈100 pF @ 0 V) bidirectional clamp placed directly at USB connector pins. Use Value: Maintains signal integrity up to 480 Mbps with <0.5 dB loss at 240 MHz; passes USB-IF compliance testing after 30 kV contact discharge. | Use Scenario: Securing half-duplex RS-485 differential pair in building automation controllers subjected to 4 kV EFT bursts. IC Role / Device Role / Timing Role: Common-mode surge suppressor bridging A/B lines to ground; handles 4 kV IEC 61000-4-4 coupling via 50 Ω/0.5 µF network. Use Value: Limits common-mode voltage excursion to <25 V, preventing receiver saturation and false logic transitions during noise bursts. |
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 | 600 W rating (10/1000 µs), higher VCL = 24.4 V @ 24.8 A, SMB package (smaller footprint, lower thermal mass) | Limited to lower-energy surges; unsuitable for 4 kV EFT or lightning-induced transients requiring ≥1500 W handling | Select when board space is critical and surge threat level is ≤2 kV IEC 61000-4-4. |
| 1.5KE15CA | Through-hole DO-201 package, 1500 W rating, but higher leakage (5 µA), no UL 497B listing, slower response due to lead inductance | Requires wave soldering; incompatible with automated SMT lines and high-density layouts | Choose only for legacy through-hole designs where rework tolerance and manual assembly are prioritized over thermal performance. |
Compared with SMBJ15CA and 1.5KE15CA, SM15T15CA delivers superior surge robustness in SMT format, lower leakage for precision analog interfaces, and certified safety compliance-making it optimal for next-generation industrial and automotive electronics requiring compact, high-reliability protection.
Availability
SM15T15CA is available at Aetrix Electronics and suitable for industrial I/O modules, automotive body control units, USB 2.0 host ports, and RS-485 communication interfaces requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for SM15T15CA 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.
SM15T15CA belongs to the SM15T TVS family-engineered specifically for high-power, high-temperature transient suppression in space-constrained SMT applications demanding IEC 61000-4-2/4-4 compliance and long-term reliability.
FAQ
What is the maximum clamping voltage of SM15T15CA under a 4 kV EFT burst?
The clamping voltage is not fixed per EFT level but depends on surge current magnitude. At 368 A (8/20 µs), VCL = 21.2 V. For a 4 kV IEC 61000-4-4 burst coupled via 50 Ω/0.5 µF, peak current reaches ~300 A, resulting in VCL ≈ 20.5–21.0 V-well below typical 24 V interface IC limits.
Can SM15T15CA be used in place of a unidirectional TVS like SM15T15A?
No-it is bidirectional (CA suffix) and symmetric; replacing a unidirectional device may cause unintended conduction in DC-biased circuits. Use SM15T15A only where polarity is fixed (e.g., power rail protection); SM15T15CA is mandatory for AC or floating signal lines like RS-485 or Ethernet pairs.
Does SM15T15CA require derating at elevated ambient temperatures?
Yes-peak pulse power derates linearly above 25 °C ambient. At 85 °C ambient (assuming 65 °C rise to 150 °C junction), PPP drops to ~1250 W (10/1000 µs). Designers must verify thermal layout using Figure 11 (Zth(j-a)) and Figure 12 (copper area impact) from DS0683 Rev 8.
Is the SMC package of SM15T15CA compatible with standard reflow profiles?
Yes-ST specifies a JEDEC J-STD-020-compliant reflow profile with peak temperature 240–245 °C for 20–40 seconds. The matte tin plating meets J-STD-002 and supports lead-free assembly; board-level reliability is validated per MSL level 1 (unlimited floor life at ≤30 °C/60% RH).
SM15T15CA 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):
- 12.8V
- Voltage - Breakdown (Min):
- 14.3V
- Voltage - Clamping (Max) @ Ipp:
- 27.2V
- Current - Peak Pulse (10/1000µs):
- 368A (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
SM15T15CA FAQ
1.How can I place an order for SM15T15CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T15CA 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 SM15T15CA reliable?
The price and inventory of SM15T15CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM15T15CA is usually 5 days.
3.What payment methods are accepted for SM15T15CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T15CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T15CA?
SM15T15CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T15CA 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 SM15T15CA?
For technical support, including SM15T15CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T15CA requirements.
6.How does Aetrix verify that SM15T15CA is sourced from the original manufacturer or authorized distributors?
All SM15T15CA 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 SM15T15CA meets industry standards.
7.What is the process for return or replacement of SM15T15CA?
All SM15T15CA units undergo pre-shipment inspection (PSI). If there is an issue with SM15T15CA, 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 SM15T15CA part is unused and in its original packaging.
Return procedure for SM15T15CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM15T15CA Tags
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