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STMicroelectronics SM6T15CA
- Part No.:
- SM6T15CA
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T15CA.pdf
- Description:
- TVS DIODE 12.8VWM 21.2VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:13,731
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Product details
Overview
SM6T15CA from STMicroelectronics is a bidirectional transient voltage suppression (TVS) diode in SMB package, designed for IEC 61000-4-2 ESD protection (30 kV air/contact discharge) and IEC 61000-4-4 surge immunity (4 kV level 4). It features a 15 V standoff voltage (VRM = 12.8 V min), 21.2 V clamping voltage at 28 A (10/1000 µs), and low leakage current (0.2 µA at 25 °C). It protects signal lines and power rails in industrial PLCs, telecom interfaces, and automotive body electronics.
For engineers reviewing the SM6T15CA datasheet, SM6T15CA pinout, SM6T15CA application, or SM6T15CA equivalent, this device is selected for robust bidirectional overvoltage clamping in space-constrained SMB layouts where junction temperature stability up to 150 °C and sub-1 Ω dynamic resistance are required.
Technical Context
The SM6T15CA operates as a voltage-clamped avalanche diode with symmetrical bidirectional breakdown behavior, enabling protection of AC-coupled or floating signal paths without polarity constraints. Its planar silicon construction ensures stable VBR drift (αT = 8.4 × 10⁻⁴ /°C) and low capacitance (≈100 pF at 1 V, f = 1 MHz) across temperature.
It delivers 600 W peak pulse power (10/1000 µs) at 25 °C and retains 350 W at Tj = 150 °C, supported by thermal impedance of ≈100 °C/W on standard FR4 footprint. Clamping performance is defined by dynamic resistance RD = 0.193 Ω (10/1000 µs), ensuring predictable VCL rise under fast transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 12.8 V min - Ensures no conduction during normal 15 V rail operation |
| Breakdown Voltage (VBR) | 15.0 V typ at 1 mA - Defines precise turn-on threshold for transient detection |
| Clamping Voltage (VCL) | 21.2 V max at 28 A (10/1000 µs) - Limits downstream IC stress to safe margin below 24 V logic tolerance |
| Peak Pulse Power (PPP) | 600 W (10/1000 µs) - Sustains common industrial surge profiles without failure |
| Leakage Current (IRM) | 0.2 µA at 25 °C - Prevents signal integrity degradation in high-impedance sensor interfaces |
| Junction Temperature Range | –55 °C to +150 °C - Enables deployment in under-hood automotive or industrial ambient environments |
| ESD Rating | ±30 kV contact/air discharge (IEC 61000-4-2) - Exceeds level 4 requirements for user-accessible ports |
Pinout & Package
SM6T15CA is housed in an SMB (DO-214AA) surface-mount package measuring 3.30–3.95 mm × 5.10–5.60 mm × 2.45 mm max height, with matte tin-plated leads compliant with J-STD-002 and JEDEC MO-136. The device has two terminals with symmetrical bidirectional conduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional avalanche junction | No polarity assignment - either terminal serves as cathode depending on transient polarity |
| Cathode/Anode (symmetrical) | Reverse-biased clamping path | Provides identical 21.2 V clamping for positive or negative transients on protected line |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping symmetry | Identical VBR (15 V) and VCL (21.2 V) for ± transients - eliminates need for dual-diode arrangements |
| Low dynamic resistance | RD = 0.193 Ω (10/1000 µs) - minimizes voltage overshoot during high-di/dt events like relay switching |
| High-temperature power derating | 350 W PPP retained at Tj = 150 °C - supports reliable operation in thermally dense PCB layouts |
| UL497B recognition | Agency file E136224 - qualifies for use as isolated loop circuit protector in safety-critical industrial systems |
| Low junction capacitance | ≈100 pF at 1 V (f = 1 MHz) - preserves signal integrity on 10 Mbps RS-485 or CAN FD buses |
Applications
| Industrial PLC Analog Input Modules | Automotive Body Control Module (BCM) LIN Bus |
|---|---|
Use Scenario: Protecting 0–10 V analog input channels from ESD and load dump-induced transients in factory-floor control cabinets. IC Role / Device Role / Timing Role: Bidirectional TVS placed directly at connector entry point to clamp both polarities before signal conditioning op-amps. Use Value: Prevents latch-up or parametric shift in precision ADC front-ends by limiting voltage excursion to ≤21.2 V during 4 kV IEC 61000-4-4 surges. |
Use Scenario: Safeguarding LIN transceiver pins against battery disconnection spikes and ESD in door module assemblies. IC Role / Device Role / Timing Role: Low-capacitance TVS mounted adjacent to LIN PHY to suppress transients without distorting 19.2 kbps data edges. Use Value: Maintains bus timing integrity with <100 pF loading while surviving ±30 kV ESD per ISO 10605 and 100 V load dump pulses. |
| Telecom Remote Terminal Unit (RTU) Serial Ports | Smart Energy Meter RS-485 Interfaces |
Use Scenario: Shielding RS-232/RS-485 ports on outdoor-mounted RTUs exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Primary clamping device on differential pair, coordinated with GDT or MOV for staged protection. Use Value: Delivers 600 W surge handling (10/1000 µs) with 21.2 V clamping to keep transceivers within absolute maximum ratings during multi-kA events. |
Use Scenario: Securing half-duplex RS-485 communication lines between meter and concentrator in utility substations. IC Role / Device Role / Timing Role: Bidirectional TVS placed on A/B lines with 15 V standoff to avoid false triggering during 12 V bias conditions. Use Value: Enables compliance with IEC 61000-4-4 level 4 (4 kV) while maintaining <1 µA leakage to prevent DC bias drift on termination resistors. |
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 (Bourns) | Same SMB package, 15 V VRM, but higher VCL = 24.4 V at 24.7 A (10/1000 µs); RD = 0.24 Ω | Higher clamping voltage reduces margin for 24 V system ICs | Select when lower cost is prioritized and 24.4 V clamping remains within downstream IC tolerances |
| P6SMB15CA (Littelfuse) | Identical electrical specs (VBR = 15 V, VCL = 21.2 V), but UL497B not explicitly cited; MSL level 1 same | Lacks UL497B listing - may require additional certification for isolated loop designs | Select when UL497B recognition is not mandated and sourcing flexibility is needed |
Compared with SMBJ15CA and P6SMB15CA, SM6T15CA offers tighter VCL control and formal UL497B recognition-critical for certified industrial isolators-while maintaining identical SMB footprint and thermal performance at 150 °C junction temperature.
Availability
SM6T15CA is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and smart metering applications requiring stable component supply and long-term lifecycle assurance.
Supply support for SM6T15CA 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 SM6T series belongs to ST's transient protection portfolio, engineered specifically for high-reliability bidirectional clamping in harsh electromagnetic environments where low leakage, thermal stability, and international safety certifications are mandatory.
FAQ
What is the maximum clamping voltage of SM6T15CA under a 10/1000 µs surge?
The maximum clamping voltage (VCL) of SM6T15CA is 21.2 V at 28 A for a 10/1000 µs waveform, measured at 25 °C ambient. This value increases with junction temperature at a rate defined by αT = 8.4 × 10⁻⁴ /°C, reaching approximately 23.5 V at Tj = 125 °C.
Is SM6T15CA suitable for protecting CAN FD bus lines?
Yes - its typical junction capacitance of ~100 pF at 1 V (1 MHz) and bidirectional 21.2 V clamping make it compatible with CAN FD (up to 5 Mbps) when placed with minimal trace length. It must be used alongside proper common-mode chokes and layout isolation to avoid signal integrity degradation.
Does SM6T15CA meet UL497B requirements for isolated loop circuits?
Yes - SM6T15CA is officially recognized to UL497B as an isolated loop circuit protector under STMicroelectronics' agency file number E136224, covering both unidirectional and bidirectional variants in the SM6TxxA/CA family.
How does SM6T15CA's power derating behave above 25 °C?
SM6T15CA maintains 350 W peak pulse power at Tj = 150 °C, per Figure 3 in DS0684. Derating follows a linear reduction from 600 W at 25 °C to 350 W at 150 °C, corresponding to a slope of ≈–2.5 W/°C - critical for thermal design in enclosed enclosures or high-power density boards.
SM6T15CA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-214AA, SMB
- Series:
- SM6T, 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:
- 21.2V
- Current - Peak Pulse (10/1000µs):
- 28A
- Power - Peak Pulse:
- 600W
- 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:
- SMB
SM6T15CA FAQ
1.How can I place an order for SM6T15CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T15CA 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 SM6T15CA reliable?
The price and inventory of SM6T15CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6T15CA is usually 5 days.
3.What payment methods are accepted for SM6T15CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T15CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T15CA?
SM6T15CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T15CA 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 SM6T15CA?
For technical support, including SM6T15CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T15CA requirements.
6.How does Aetrix verify that SM6T15CA is sourced from the original manufacturer or authorized distributors?
All SM6T15CA 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 SM6T15CA meets industry standards.
7.What is the process for return or replacement of SM6T15CA?
All SM6T15CA units undergo pre-shipment inspection (PSI). If there is an issue with SM6T15CA, 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 SM6T15CA part is unused and in its original packaging.
Return procedure for SM6T15CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6T15CA Tags
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