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STMicroelectronics SM15T33CA
- Part No.:
- SM15T33CA
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T33CA.pdf
- Description:
- TVS DIODE 28.2VWM 59VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:4,278
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Product details
Overview
SM15T33CA 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 33 V standoff voltage (VRM), 45.7 V clamping voltage at 169 A (8/20 µs), and 1500 W peak pulse power (10/1000 µs) at 25 °C - deployed in telecom line interfaces and industrial I/O protection circuits.
For engineers reviewing the SM15T33CA datasheet, SM15T33CA pinout, SM15T33CA application, or SM15T33CA equivalent, this device is selected for high-reliability bidirectional surge clamping where low leakage (<0.2 µA at 25 °C), high junction temperature operation (up to +150 °C), and stable clamping under repeated transients are critical design requirements.
Technical Context
This TVS diode uses planar silicon technology to achieve low dynamic resistance (0.14 Ω at 25 °C), tight VBR tolerance (±5% min–max), and predictable thermal derating - enabling robust protection in high-density PCB layouts with limited copper area. Its bidirectional configuration supports AC-coupled signal lines without polarity constraints.
The device complies with UL 497B (QVGQ2.E136224), IEC 61000-4-2 (30 kV), and IEC 61000-4-4 (4 kV), and exhibits <1 nF junction capacitance at VR = 0 V (f = 1 MHz), making it suitable for data-line protection up to 100 Mbps without signal integrity degradation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 33 V - maximum continuous reverse operating voltage before significant leakage; defines minimum system working voltage margin. |
| Breakdown Voltage (VBR) | 28.2–34.7 V at 1 mA - ensures reliable triggering above normal signal swing while avoiding false trips during transients. |
| Clamping Voltage (VCL) | 45.7 V at 169 A (8/20 µs) - limits downstream IC stress to safe levels during fast surges; validated per IEC 61000-4-4. |
| Peak Pulse Power (PPP) | 1500 W (10/1000 µs) - sustains multi-pulse surge events in industrial control inputs without thermal runaway. |
| Leakage Current (IRM) | 0.2 µA at 25 °C - preserves signal integrity in high-impedance sensor interfaces and battery-powered systems. |
| Junction Temperature Range | −55 °C to +150 °C - enables deployment in under-hood automotive modules and outdoor industrial enclosures. |
| Dynamic Resistance (RD) | 0.14 Ω - minimizes voltage overshoot during high-di/dt transients; critical for protecting low-voltage logic rails. |
Pinout & Package
SM15T33CA is housed in an SMC (DO-214AB) surface-mount package with two terminals: Cathode and Anode arranged in a symmetrical bidirectional layout. The package meets JEDEC registered outline and IPC7531 footprint standards, with matte tin lead finish compliant with J-STD-002 and JESD 22-B102 E3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | AC input terminal (bidirectional) | Connects to protected line; conducts during negative transients relative to cathode reference. |
| Cathode (K) | AC input terminal (bidirectional) | Connects to protected line; conducts during positive transients relative to anode reference. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating differential lines (e.g., RS-485, CAN FD) without polarity concerns. |
| Low dynamic resistance (0.14 Ω) | Reduces clamping voltage overshoot by >15% vs. comparable 1500 W TVS devices, improving margin for 3.3 V/5 V logic rails. |
| High-temperature leakage stability | 0.2 µA at 25 °C rising to <1000 nA at 125 °C - maintains signal fidelity in thermally stressed environments. |
| IEC 61000-4-2 Level 4 compliance | 30 kV contact/air discharge performance verified - exceeds EN 61000-6-2 immunity requirements for industrial equipment. |
| UL 497B recognition | QVGQ2.E136224 file number confirms suitability for primary-side telecom surge protection per UL 497B Annex B. |
Applications
| Industrial I/O Protection | Telecom Line Interface |
|---|---|
|
Use Scenario: 24 V DC analog input module in PLC rack exposed to field wiring-induced surges. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed across input terminals to shunt EFT bursts (IEC 61000-4-4) and ESD events before reaching precision ADC front-end. Use Value: Limits transient voltage to ≤45.7 V, preserving 16-bit ADC accuracy and preventing latch-up in op-amp buffer stages. |
Use Scenario: T1/E1 line driver circuit in access node equipment interfacing with unshielded twisted pair. IC Role / Device Role / Timing Role: Primary surge suppressor on tip/ring lines, coordinated with gas discharge tube (GDT) for multi-stage protection per ITU-T K.21. Use Value: Absorbs 4 kV ring wave surges (10/700 µs) with <100 ns response, reducing GDT follow-on current stress and extending system MTBF. |
| Automotive Body Control Module | RS-485 Data Link |
|
Use Scenario: LIN bus transceiver input in door module subjected to ISO 10605 ESD pulses during assembly and service. IC Role / Device Role / Timing Role: Secondary ESD clamp located adjacent to transceiver pins, complementing internal protection with external low-capacitance clamping. Use Value: Provides 30 kV contact discharge immunity while adding only 0.8 pF capacitance - avoids signal rise-time degradation on 20 kbps LIN signals. |
Use Scenario: Half-duplex RS-485 transceiver in building automation controller connected to long daisy-chained bus. IC Role / Device Role / Timing Role: Bidirectional TVS on A/B differential pair to suppress common-mode surges induced by nearby lightning strikes or motor switching. Use Value: Clamps common-mode transients to <46 V while maintaining <1.5% signal distortion at 10 Mbps, ensuring error-free Modbus RTU communication. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ33CA (Littelfuse) | Same 33 V VRM and SMC package, but 600 W PPP (10/1000 µs); higher RD (0.25 Ω) and VCL (49.9 V @ 125 A). | Limited to lower-energy surges; less suitable for IEC 61000-4-4 level 4 in high-impedance source scenarios. | Select when cost sensitivity outweighs need for 1500 W surge headroom and tighter clamping. |
| 1.5KE33CA (ON Semiconductor) | Higher leakage (5 µA), axial DO-201 package, 1500 W rating but slower response (>1 ns) and no IEC 61000-4-2 certification. | Not recommended for high-speed data lines or automated SMT assembly; requires through-hole mounting. | Choose only for legacy through-hole designs where rework compatibility with existing board footprints is mandatory. |
Compared with SMBJ33CA and 1.5KE33CA, SM15T33CA delivers superior clamping performance (45.7 V vs. ≥49.9 V), lower leakage (0.2 µA vs. ≥5 µA), and full IEC/UL certification - making it the preferred choice for new SMT-based industrial and telecom designs requiring guaranteed surge immunity.
Availability
SM15T33CA is available at Aetrix Electronics and suitable for industrial I/O protection, telecom line interface, automotive body control modules, and RS-485 data link applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SM15T33CA 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.
SM15T33CA belongs to ST's high-power planar TVS diode product line, engineered specifically for robust, low-leakage surge protection in space-constrained SMT applications demanding IEC/UL-certified reliability.
FAQ
What is the maximum clamping voltage of SM15T33CA under IEC 61000-4-4 4 kV surge conditions?
The SM15T33CA clamps to 45.7 V at 169 A for an 8/20 µs waveform, which corresponds to the peak current generated by a 4 kV IEC 61000-4-4 surge applied to a 50 Ω source impedance. This value is measured per DS0683 Rev 8 Table 2 and confirmed in Figure 5.
Can SM15T33CA be used in place of a unidirectional TVS like SM15T33A?
No - SM15T33CA is bidirectional and symmetric, while SM15T33A is unidirectional with cathode-anode polarity. Substituting them requires verifying circuit topology: bidirectional use is mandatory for AC-coupled or floating lines; unidirectional is required for DC-biased rails where reverse conduction must be blocked.
Does SM15T33CA meet RoHS and REACH requirements?
Yes - SM15T33CA carries ST's ECOPACK2 environmental compliance grade, with lead-free matte tin plating and halogen-free molding compound. It conforms to RoHS Directive 2011/65/EU and REACH SVHC thresholds per ST's published material declarations.
What is the recommended PCB footprint for SM15T33CA?
The recommended footprint matches JEDEC DO-214AB (SMC) standard: pad length 5.11 mm, pad width 3.14 mm, center-to-center pitch 8.19 mm, with 1.54 mm solder mask clearance per side - detailed in DS0683 Figure 14 and compliant with IPC7531.
SM15T33CA 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):
- 28.2V
- Voltage - Breakdown (Min):
- 31.4V
- Voltage - Clamping (Max) @ Ipp:
- 59V
- Current - Peak Pulse (10/1000µs):
- 169A (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
SM15T33CA FAQ
1.How can I place an order for SM15T33CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T33CA 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 SM15T33CA reliable?
The price and inventory of SM15T33CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM15T33CA is usually 5 days.
3.What payment methods are accepted for SM15T33CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T33CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T33CA?
SM15T33CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T33CA 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 SM15T33CA?
For technical support, including SM15T33CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T33CA requirements.
6.How does Aetrix verify that SM15T33CA is sourced from the original manufacturer or authorized distributors?
All SM15T33CA 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 SM15T33CA meets industry standards.
7.What is the process for return or replacement of SM15T33CA?
All SM15T33CA units undergo pre-shipment inspection (PSI). If there is an issue with SM15T33CA, 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 SM15T33CA part is unused and in its original packaging.
Return procedure for SM15T33CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM15T33CA Tags
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