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STMicroelectronics SM15T22A
- Part No.:
- SM15T22A
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T22A.pdf
- Description:
- TVS DIODE 18.8VWM 39.3VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:2,604
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Product details
Overview
SM15T22A from STMicroelectronics is a unidirectional 1500 W transient voltage suppression diode in SMC package, designed for IEC 61000-4-2 ESD (30 kV air/contact) and IEC 61000-4-4 surge (4 kV level 4) protection. It features 22 V breakdown voltage (VBR = 18.8–23.1 V), 30.6 V clamping voltage at 1 A (VCL), and 0.2 µA max leakage at 25 °C - enabling reliable overvoltage protection in high-reliability power supplies and industrial interfaces.
For engineers reviewing the SM15T22A datasheet, SM15T22A pinout, SM15T22A application, or SM15T22A equivalent, this device is selected for its low-leakage planar junction, high Tj capability (150 °C), and validated 10/1000 µs surge rating - critical when protecting DC input rails, PoE injectors, and motor drive control circuits against repetitive transients.
Technical Context
The SM15T22A uses a planar silicon avalanche structure optimized for low dynamic resistance (RD = 0.153 Ω at 25 °C) and stable clamping across temperature (αT = 9.2 × 10−4/°C). Its unidirectional configuration supports DC-biased lines where reverse conduction must be blocked.
It delivers 1250 W peak pulse power at Tj = 150 °C (10/1000 µs), with thermal impedance Zth(j-a) = ~40 °C/W on standard FR4 footprint. Junction capacitance is 49 pF at 0 V (f = 1 MHz), making it suitable for <1 MHz signal paths without signal integrity degradation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/typ/max) | 18.8 / 20.9 / 22 V - ensures reliable turn-on before downstream IC damage at 22 V nominal rail |
| VCL @ IPP = 1 A | 30.6 V - clamps surges to safe levels for 24 V systems with ≥3.4 V margin to 34 V absolute max |
| IRM @ VRM | 0.2 µA max at 17.6 V - prevents leakage-induced drift in precision analog or battery-backed circuits |
| PPP (10/1000 µs) | 1500 W - sustains repeated 100 A pulses without degradation in industrial power inputs |
| Tj max | 150 °C - enables operation in enclosed enclosures or near heat sources without derating |
| CJ @ 0 V | 49 pF - negligible loading on 24 V DC control lines and low-speed sensor interfaces |
| RD | 0.153 Ω - minimizes VCL rise under high-current transients (e.g., lightning-induced surges) |
Pinout & Package
SM15T22A is housed in an SMC (DO-214AB) surface-mount package with two terminals: Cathode (marked end) and Anode. The package measures 7.75–8.15 mm × 5.55–6.25 mm × 2.45 mm max height and is compatible with IPC7531 footprints.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (marked end) | Surge current sink during transient | Connected to protected line; conducts avalanche current to ground when VLINE exceeds VBR |
| Anode | Reference/ground return path | Must be tied to low-impedance system ground to ensure effective clamping and avoid ground bounce |
Key Features
| Feature | Design Value |
|---|---|
| Low leakage current | 0.2 µA max at 25 °C - preserves battery life and avoids false triggering in always-on monitoring circuits |
| High Tj operation | Rated up to +150 °C junction temperature - eliminates thermal derating in sealed industrial enclosures |
| IEC 61000-4-2 compliance | 30 kV contact/air discharge - meets EN 61000-6-2 immunity requirements for Class A equipment |
| Planar junction technology | Enables tight VBR tolerance (±5%) and stable RD over lifetime - critical for long-term field reliability |
| Matte tin lead finish | RoHS-compliant, whisker-resistant plating - qualified per JESD201 Class 2 and MIL-STD-750 Method 2026 |
Applications
| Industrial Power Input Protection | DC Motor Drive Control Interface |
|---|---|
|
Use Scenario: 24 V DC input to PLC I/O module exposed to load dump and inductive switching noise. IC Role / Device Role / Timing Role: TVS diode placed between VIN and GND to clamp transients before they reach DC-DC converter input stage. Use Value: 30.6 V clamping ensures downstream 36 V-rated regulator remains within safe operating area during 100 A/10/1000 µs surges. |
Use Scenario: Enable/disable signal line (PWM or direction control) connecting MCU to H-bridge gate driver. IC Role / Device Role / Timing Role: Unidirectional TVS on logic-level signal path to suppress ESD from operator touch or cable coupling. Use Value: 49 pF capacitance avoids PWM edge distortion; 0.2 µA leakage prevents false logic state in high-impedance enable inputs. |
| Telecom PoE Injector Port | Automotive Body Control Module (BCM) Sensor Supply |
|
Use Scenario: 48 V DC output of IEEE 802.3af/at PoE injector feeding powered devices over Ethernet cables. IC Role / Device Role / Timing Role: Primary surge protector on PSE side to absorb induced lightning surges and hot-swap transients. Use Value: 1500 W rating handles worst-case 10/1000 µs surges per IEC 61000-4-5; UL 497B listing validates safety for telecom infrastructure. |
Use Scenario: 12 V supply rail powering LIN bus sensors (e.g., door latch, seat position) in automotive BCM. IC Role / Device Role / Timing Role: TVS on sensor VCC line to withstand ISO 7637-2 pulse 1 (−150 V/2 Ω) and pulse 2a (+100 V). Use Value: 22 V VBR provides margin above 13.5 V nominal battery; 150 °C rating supports under-hood temperature cycling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ22A (Bourns) | Same SMC package, but lower PPP = 600 W (10/1000 µs); VBR = 23.3–25.8 V; RD = 0.35 Ω | Limited to lower-energy transients; unsuitable for repeated 100 A surges in industrial mains-connected equipment | Select only if system-level testing confirms 600 W surge energy is sufficient and tighter VBR tolerance is not required. |
| 1.5KE22A (ON Semiconductor) | Through-hole DO-201 package; PPP = 1500 W; VBR = 18.8–23.1 V; but Tj max = 175 °C and leakage = 5 µA @ 17.6 V | Higher leakage limits use in battery-powered or precision analog circuits; through-hole mounting incompatible with high-density SMT layouts | Choose only for legacy through-hole designs or where higher Tj margin is prioritized over leakage and board space. |
Compared with SMBJ22A and 1.5KE22A, SM15T22A uniquely balances high surge robustness (1500 W), ultra-low leakage (0.2 µA), and SMT-compatible SMC packaging - making it optimal for next-generation industrial and automotive electronics requiring both miniaturization and long-term reliability.
Availability
SM15T22A is available at Aetrix Electronics and suitable for industrial power input protection, DC motor drive interface protection, telecom PoE injector ports, and automotive BCM sensor supply rails requiring stable component supply across multi-year production cycles.
Supply support for SM15T22A 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, delivering intelligent power, sensing, and control solutions for industrial, automotive, and consumer markets.
SM15T22A belongs to ST's SM15T series of planar TVS diodes, engineered specifically for high-reliability DC power line protection where low leakage, high Tj, and repeatable clamping performance are mandatory.
FAQ
What is the maximum clamping voltage of SM15T22A at 100 A (10/1000 µs)?
Per DS0683 Rev 8 Figure 5, the clamping voltage is approximately 62 V at 100 A for 10/1000 µs waveform. This value is derived from the VCL-IPP curve and accounts for dynamic resistance (RD = 0.153 Ω) and temperature coefficient (αT = 9.2 × 10−4/°C) at Tj = 25 °C.
Can SM15T22A be used in bidirectional signal lines?
No - SM15T22A is unidirectional and conducts only when cathode voltage exceeds anode by >VBR. For bidirectional protection (e.g., RS-485, USB D+/D−), SM15T22CA - the complementary bidirectional variant - must be used instead.
What is the recommended PCB footprint for SM15T22A?
The official footprint is defined in DS0683 Figure 14: pad length 5.11 mm, pad width 1.54 mm, center-to-center spacing 8.19 mm, with 3.14 mm copper area per pad. This layout achieves Rth(j-a) ≈ 40 °C/W on 70 µm FR4, per Figure 12.
Does SM15T22A meet UL 497B for telecom surge protection?
Yes - UL 497B file number QVGQ2.E136224 is explicitly assigned to the SM15T series, confirming compliance for primary-side surge protection in telecommunications equipment including PoE injectors and DSLAMs.
SM15T22A 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:
- 1
- Bidirectional Channels:
- -
- 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
SM15T22A FAQ
1.How can I place an order for SM15T22A through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T22A 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 SM15T22A reliable?
The price and inventory of SM15T22A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM15T22A is usually 5 days.
3.What payment methods are accepted for SM15T22A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T22A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T22A?
SM15T22A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T22A 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 SM15T22A?
For technical support, including SM15T22A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T22A requirements.
6.How does Aetrix verify that SM15T22A is sourced from the original manufacturer or authorized distributors?
All SM15T22A 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 SM15T22A meets industry standards.
7.What is the process for return or replacement of SM15T22A?
All SM15T22A units undergo pre-shipment inspection (PSI). If there is an issue with SM15T22A, 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 SM15T22A part is unused and in its original packaging.
Return procedure for SM15T22A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM15T22A Tags
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