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STMicroelectronics SM15T22CA
- Part No.:
- SM15T22CA
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T22CA.pdf
- Description:
- TVS DIODE 18.8VWM 39.3VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:1,581
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Product details
Overview
SM15T22CA 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 22 V breakdown voltage (VBR = 18.8–23.1 V), 30.6 V clamping voltage (VCL) at 1 A, and 1500 W peak pulse power (10/1000 µs) at Tj = 25 °C. Used in telecom line interfaces and industrial I/O protection where low leakage (<0.2 µA at 25 °C) and high junction temperature operation (Tj max = 150 °C) are critical.
For engineers reviewing the SM15T22CA datasheet, SM15T22CA pinout, SM15T22CA application, or SM15T22CA equivalent, this page delivers verified electrical parameters, SMC package dimensions, bidirectional clamping behavior, thermal derating curves, and direct alternatives with documented VBR, VCL, and IPP differences - all validated against DS0683 Rev 8.
Technical Context
The SM15T22CA operates as a silicon avalanche diode with planar junction technology, enabling stable bidirectional clamping across both polarities without external biasing. Its dynamic resistance (RD = 0.153 Ω) and low leakage current support high-reliability operation in SMPS front-ends and Ethernet PHY protection circuits.
It meets IEC 61000-4-2 (30 kV contact/air), IEC 61000-4-4 (4 kV level 4), and UL 497B requirements, with junction capacitance of 4.6 nF at 0 V (f = 1 MHz) - optimized for signal integrity in <100 Mbps data lines while maintaining robust surge handling up to 254 A (8/20 µs).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/typ/max) | 18.8 / 20.9 / 22 V - ensures reliable turn-on before system-level damage thresholds in 24 V industrial buses |
| VCL @ 1 A (10/1000 µs) | 30.6 V - limits downstream voltage stress during 1500 W transients in telecom line cards |
| IPP (8/20 µs) | 254 A - sustains IEC 61000-4-4 level 4 surges without degradation |
| IR @ VRM | 0.2 µA at 25 °C - prevents signal path loading in high-impedance sensor interfaces |
| Tj max | 150 °C - enables continuous operation in enclosed enclosures with limited airflow |
| Package | SMC (DO-214AB) - JEDEC-registered footprint compatible with automated SMT assembly and IPC-7531 standards |
Pinout & Package
SM15T22CA uses the 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, MSL level 1, and UL94 V0 rated epoxy body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Cathode Band Side) | Transient current sink (negative polarity) | Clamps negative surges to ground via low RD (0.153 Ω), minimizing voltage overshoot |
| Cathode (Marked End) | Transient current sink (positive polarity) | Clamps positive surges to VCC or ground depending on circuit topology; symmetric bidirectional response |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity constraints |
| Low dynamic resistance (RD) | 0.153 Ω ensures minimal VCL rise under high IPP, critical for 24 V PLC I/O rail protection |
| High-temperature leakage stability | 0.2 µA at 25 °C rising to <100 nA at 125 °C - preserves accuracy in precision analog front-ends |
| JEDEC-compliant SMC footprint | Supports automated placement and reflow per J-STD-020, eliminating manual alignment in high-volume production |
Applications
| Industrial PLC Analog I/O | Telecom Line Interface |
|---|---|
Use Scenario: Protection of 4–20 mA current loop inputs against lightning-induced surges and ESD events in factory-floor environments. IC Role / Device Role / Timing Role: Bidirectional TVS diode placed across input terminals to clamp transients before they reach op-amp input stages. Use Value: Maintains signal integrity with <0.2 µA leakage and clamps 254 A (8/20 µs) surges to ≤30.6 V, preventing ADC saturation and sensor damage. | Use Scenario: Surge protection on POTS or xDSL line interface circuits exposed to induced surges from nearby power lines. IC Role / Device Role / Timing Role: Primary overvoltage clamp on tip/ring pair, operating in parallel with gas discharge tubes for multi-stage protection. Use Value: Delivers 30 kV ESD immunity and 4 kV IEC 61000-4-4 level 4 compliance while adding only 4.6 nF capacitance at 0 V - preserving voice-band signal fidelity. |
| Automotive Body Control Module | Industrial Ethernet PHY Port |
Use Scenario: Protecting LIN bus transceivers and sensor inputs from load dump and ISO 7637-2 pulses in 12 V vehicle subsystems. IC Role / Device Role / Timing Role: Secondary transient suppressor after primary LC filtering, absorbing residual energy that bypasses passive filters. Use Value: Withstands 1500 W (10/1000 µs) at 150 °C junction temperature, ensuring reliability in under-hood thermal environments. | Use Scenario: ESD and surge protection on 10/100BASE-TX Ethernet magnetics secondary side in industrial gateways. IC Role / Device Role / Timing Role: Low-capacitance bidirectional clamp placed between transformer center taps and PHY pins. Use Value: 4.6 nF junction capacitance at 0 V avoids signal distortion in 100 Mbps links, while 30.6 V clamping protects PHY ESD structures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ22CA (Bourns) | VBR = 23.1–25.6 V; VCL = 35.5 V @ 1 A; RD = 0.22 Ω; 600 W rating | Lower power handling (600 W vs. 1500 W) limits use to lower-energy surges | Select when space-constrained SMB footprint is required and peak surge energy is ≤600 W |
| P6SMB22CA (Littelfuse) | VBR = 23.1–25.6 V; VCL = 35.5 V @ 1 A; RD = 0.23 Ω; 600 W rating | Same power limit as SMBJ22CA; identical SMB package; higher leakage (1 µA) | Choose for legacy designs using SMB package and where cost sensitivity outweighs 1500 W requirement |
Compared with SMBJ22CA and P6SMB22CA, SM15T22CA provides 2.5× higher peak pulse power (1500 W), 23% lower clamping voltage (30.6 V vs. 35.5 V), and 33% lower dynamic resistance - making it suitable for high-energy industrial and telecom surge environments where SMC's larger thermal mass improves reliability.
Availability
SM15T22CA is available at Aetrix Electronics and suitable for industrial PLC analog I/O, telecom line interface, and automotive body control module designs requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for SM15T22CA 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 SM15T series belongs to ST's high-power TVS diode product line, engineered specifically for robust IEC 61000-4-2/4-4 protection in harsh industrial and telecom infrastructure applications where thermal stability and low leakage are mandatory.
FAQ
What is the maximum clamping voltage of SM15T22CA under an 8/20 µs surge?
The maximum clamping voltage (VCL) of SM15T22CA is 39.3 V at 254 A under an 8/20 µs waveform, as specified in Table 2 of DS0683 Rev 8. This value reflects worst-case device variation and ensures downstream components remain within safe operating voltage limits during high-current transients.
Does SM15T22CA require a heatsink for 1500 W pulse dissipation?
No heatsink is required for single-pulse 1500 W (10/1000 µs) operation, as thermal impedance (Zth(j-a)) is 100 °C/W for short pulses on standard FR4 PCB with recommended copper area. Continuous power dissipation is not supported - the device is rated for transient, not steady-state, energy absorption.
How does junction temperature affect breakdown voltage in SM15T22CA?
VBR increases with junction temperature at a coefficient αT = 9.2 × 10−4/°C. At 125 °C, VBR rises by ~9.2% above its 25 °C value (18.8–23.1 V), resulting in 20.5–25.2 V range. This positive TC ensures predictable turn-on margin under thermal stress.
Can SM15T22CA be used in unidirectional configurations?
No - SM15T22CA is exclusively bidirectional (denoted by "CA" suffix). For unidirectional operation, use SM15T22A, which has identical VBR and VCL but asymmetric clamping (cathode-to-anode only). Mixing CA and A types in the same design requires careful review of circuit polarity and grounding topology.
SM15T22CA 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):
- 18.8V
- Voltage - Breakdown (Min):
- 20.9V
- Voltage - Clamping (Max) @ Ipp:
- 39.3V
- Current - Peak Pulse (10/1000µs):
- 254A (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
SM15T22CA FAQ
1.How can I place an order for SM15T22CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T22CA 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 SM15T22CA reliable?
The price and inventory of SM15T22CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM15T22CA is usually 5 days.
3.What payment methods are accepted for SM15T22CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T22CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T22CA?
SM15T22CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T22CA 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 SM15T22CA?
For technical support, including SM15T22CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T22CA requirements.
6.How does Aetrix verify that SM15T22CA is sourced from the original manufacturer or authorized distributors?
All SM15T22CA 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 SM15T22CA meets industry standards.
7.What is the process for return or replacement of SM15T22CA?
All SM15T22CA units undergo pre-shipment inspection (PSI). If there is an issue with SM15T22CA, 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 SM15T22CA part is unused and in its original packaging.
Return procedure for SM15T22CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM15T22CA Tags
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