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STMicroelectronics SM15T220CA
- Part No.:
- SM15T220CA
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T220CA.pdf
- Description:
- TVS DIODE 188VWM 388VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:3,152
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Product details
Overview
SM15T220CA from STMicroelectronics is a bidirectional transient voltage suppression (TVS) diode in SMC package, designed for high-energy ESD and surge protection in industrial power supplies and telecom interfaces. It delivers 1500 W peak pulse power (10/1000 µs), clamps at 328 V (max) under 4.6 A surge, and operates up to 150 °C junction temperature with only 0.2 µA leakage at 25 °C.
For engineers reviewing the SM15T220CA datasheet, SM15T220CA pinout, SM15T220CA application, or SM15T220CA equivalent, key selection criteria include bidirectional clamping voltage (VCL = 328 V), standoff voltage (VRWM = 220 V), low dynamic resistance (RD = 6.04 Ω), IEC 61000-4-2 ±30 kV ESD rating, and SMC package thermal performance at Tj = 150 °C.
Technical Context
This TVS diode uses planar silicon technology to achieve stable breakdown behavior and low leakage across wide temperature ranges. Its bidirectional structure enables symmetric clamping for AC-coupled lines and differential signal paths without polarity constraints.
The device meets IEC 61000-4-4 Level 4 (4 kV) and exceeds IEC 61000-4-2 Level 4 (±30 kV air/contact discharge). Its 6.04 Ω dynamic resistance ensures predictable voltage rise under fast-rising surges (8/20 µs), while junction capacitance remains below 100 pF at 1 MHz and 220 V reverse bias.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 220 V - maximum continuous reverse working voltage before clamping begins |
| VBR (min) | 188 V at 1 mA - guaranteed breakdown initiation threshold under DC test conditions |
| VCL (max) | 328 V at 4.6 A (10/1000 µs) - peak clamped voltage limiting stress on downstream circuitry |
| PPP | 1500 W (10/1000 µs) - surge energy handling capacity for standard lightning transients |
| IPP (8/20 µs) | 388 A - peak current capability for fast-rising surges like IEC 61000-4-4 |
| RD | 6.04 Ω - dynamic resistance governing voltage overshoot during transient events |
| Tj max | 150 °C - maximum junction temperature enabling operation in high-ambient industrial environments |
Pinout & Package
The SM15T220CA is housed in an SMC (DO-214AB) surface-mount package with two terminals: Cathode and Anode. The bidirectional configuration means both terminals function identically under reverse polarity, eliminating orientation dependency during PCB placement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Surge current entry point (positive half-cycle) | Accepts transient current during positive voltage excursions; forms symmetrical clamp path with Cathode |
| Cathode | Surge current entry point (negative half-cycle) | Accepts transient current during negative voltage excursions; completes bidirectional clamping loop |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC lines, RS-485 buses, and Ethernet PHY interfaces without polarity concerns |
| Low leakage current | 0.2 µA at 25 °C minimizes standby power loss and avoids false triggering in high-impedance sensing circuits |
| High-temperature reliability | Rated for 150 °C junction operation, supporting use in enclosed power converters and outdoor telecom enclosures |
| IEC 61000-4-2 compliance | Withstands ±30 kV contact and air discharge, exceeding Level 4 requirements for industrial equipment certification |
| Planar junction construction | Delivers consistent VBR tolerance (±5%) and stable RD across production lots and temperature range |
Applications
| Industrial Power Input Protection | Telecom Line Interface |
|---|---|
Use Scenario: 24–48 V DC input stage of programmable logic controllers exposed to load dump and inductive switching transients. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed upstream of DC-DC converter input filter. Use Value: Limits transient voltage to ≤328 V, protecting MOSFET gate drivers and controller ICs rated for 36 V absolute maximum. | Use Scenario: RS-485 transceiver bus lines in factory automation networks subject to cable coupling and ground potential differences. IC Role / Device Role / Timing Role: Bidirectional surge limiter between differential pair and transceiver pins. Use Value: Clamps common-mode surges up to 388 A (8/20 µs) while maintaining <100 pF capacitance to preserve signal integrity at 10 Mbps. |
| AC/DC Adapter Secondary Side | Smart Meter Communication Port |
Use Scenario: Output rectifier rail of isolated flyback adapters powering IoT gateways, where secondary-side surges originate from primary-side coupling. IC Role / Device Role / Timing Role: Fast-response shunt protector parallel to output capacitor. Use Value: Responds within nanoseconds to suppress 1500 W transients, preventing overvoltage damage to USB-PD controllers and microcontrollers. | Use Scenario: PLC or RF module interface in utility smart meters installed in electrically noisy substations. IC Role / Device Role / Timing Role: Final-stage ESD guard on HART or M-Bus communication pins. Use Value: Survives repeated ±30 kV ESD strikes per IEC 61000-4-2 while maintaining leakage <0.2 µA to avoid metering accuracy drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ220CA | Lower peak power (600 W), higher VCL (356 V at 3.7 A), same SMC package | Not suitable for 1500 W surge environments; limited to lower-energy interfaces like CAN or USB | Select when cost sensitivity outweighs surge margin and system-level testing confirms 600 W sufficiency |
| 1.5KE220CA | Higher VCL (356 V), axial lead DO-201 package, 1500 W rating but no IEC 61000-4-2 validation | Requires through-hole assembly; lacks certified ESD robustness for automated industrial equipment | Choose only for legacy through-hole designs where rework to SMD is impractical and ESD certification is not required |
Compared with SMBJ220CA and 1.5KE220CA, SM15T220CA provides superior thermal derating above 100 °C, verified ±30 kV ESD performance, and lower dynamic resistance-making it the preferred choice for high-reliability, surface-mount industrial power and data line protection.
Availability
SM15T220CA is available at Aetrix Electronics and suitable for industrial power input protection, telecom line interface, AC/DC adapter secondary side, and smart meter communication port applications requiring stable component supply across extended temperature and surge stress conditions.
Supply support for SM15T220CA 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 microcontroller technologies for industrial, automotive, and consumer markets.
The SM15T series belongs to ST's high-power TVS diode product line, engineered specifically for robust transient suppression in harsh electromagnetic environments-targeting industrial automation, telecom infrastructure, and energy metering systems.
FAQ
What is the maximum clamping voltage of SM15T220CA under a 10/1000 µs surge?
The maximum clamping voltage (VCL) is 328 V when subjected to a 4.6 A peak current pulse with 10/1000 µs waveform. This value is measured at Tj = 25 °C and defines the upper voltage limit imposed on protected circuitry during standardized lightning-surge testing.
Does SM15T220CA meet IEC 61000-4-2 ESD immunity requirements?
Yes-SM15T220CA exceeds IEC 61000-4-2 Level 4, with validated performance at ±30 kV for both contact and air discharge tests. Its low leakage (0.2 µA) and planar junction ensure repeatable ESD response without parameter drift after multiple strikes.
Can SM15T220CA be used in bidirectional AC signal paths?
Yes-the "CA" suffix denotes bidirectional construction, allowing symmetric clamping across both polarities. It is commonly deployed on RS-485, CAN FD, and Ethernet differential pairs where signal swing crosses zero and polarity reversal occurs during normal operation.
What is the thermal resistance junction-to-ambient for SM15T220CA on a standard FR4 PCB?
On a recommended footprint (copper area ≈ 3.5 cm² per lead), Rth(j-a) is approximately 100 °C/W for short pulses. For continuous thermal design, derating curves in Figure 11 of DS0683 show Zth(j-a) drops to ~25 °C/W at 10 s pulse duration, supporting sustained surge duty cycles in industrial environments.
SM15T220CA 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):
- 188V
- Voltage - Breakdown (Min):
- 209V
- Voltage - Clamping (Max) @ Ipp:
- 388V
- Current - Peak Pulse (10/1000µs):
- 26A (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
SM15T220CA FAQ
1.How can I place an order for SM15T220CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T220CA 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 SM15T220CA reliable?
The price and inventory of SM15T220CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM15T220CA is usually 5 days.
3.What payment methods are accepted for SM15T220CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T220CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T220CA?
SM15T220CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T220CA 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 SM15T220CA?
For technical support, including SM15T220CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T220CA requirements.
6.How does Aetrix verify that SM15T220CA is sourced from the original manufacturer or authorized distributors?
All SM15T220CA 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 SM15T220CA meets industry standards.
7.What is the process for return or replacement of SM15T220CA?
All SM15T220CA units undergo pre-shipment inspection (PSI). If there is an issue with SM15T220CA, 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 SM15T220CA part is unused and in its original packaging.
Return procedure for SM15T220CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM15T220CA Tags
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