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STMicroelectronics SM15T24CA
- Part No.:
- SM15T24CA
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T24CA.pdf
- Description:
- TVS DIODE 20.5VWM 42.8VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:2,622
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Product details
Overview
SM15T24CA 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 24 V standoff voltage (VRM), 33.2 V clamping voltage at 1 A (VCL), 1500 W peak pulse power (10/1000 µs), and operates up to 150 °C junction temperature. It is used in telecom line interfaces, industrial I/O ports, and AC/DC power supply inputs requiring robust overvoltage resilience.
For engineers reviewing the SM15T24CA datasheet, SM15T24CA pinout, SM15T24CA application, or SM15T24CA equivalent, key selection criteria include bidirectional clamping behavior, low leakage (<0.2 µA at 25 °C), thermal derating above 25 °C, and compatibility with FR4 PCB footprints per IPC7531 - all critical for high-reliability surge protection in harsh environments.
Technical Context
The SM15T24CA employs planar silicon avalanche technology to deliver precise bidirectional clamping across both polarities, enabling symmetric protection of differential signal lines or AC-coupled circuits without polarity constraints. Its dynamic resistance (RD = 0.178 Ω at 25 °C) ensures minimal voltage overshoot during fast transients like 8/20 µs surges.
Thermal performance is defined by junction-to-ambient thermal resistance (Rth(j-a) ≤ 120 °C/W on standard footprint), with peak power derating linearly from 1500 W at 25 °C to ~1250 W at 150 °C junction temperature. The device meets MIL-STD-883 Method 3015 and IEC 61000-4-2/4-4 compliance without external biasing or control circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 24 V - Maximum continuous reverse operating voltage before clamping begins; defines minimum system working voltage margin. |
| Clamping Voltage (VCL) | 33.2 V at 1 A (10/1000 µs) - Peak voltage seen by protected circuit during rated surge; determines downstream component voltage stress. |
| Peak Pulse Power (PPP) | 1500 W (10/1000 µs) - Maximum transient energy absorption capability under standard surge waveform; sets protection level for lightning-induced surges. |
| Leakage Current (IRM) | 0.2 µA at 25 °C - Ultra-low reverse leakage preserves signal integrity and minimizes standby power loss in high-impedance nodes. |
| Junction Temperature Range | –55 °C to +150 °C - Enables operation in extended industrial and automotive under-hood environments without thermal shutdown. |
| ESD Withstand (IEC 61000-4-2) | 30 kV contact & air discharge - Exceeds level 4 requirements; eliminates need for secondary ESD stages in front-end protection. |
| Surge Rating (IEC 61000-4-4) | 4 kV level 4 - Validated for repetitive fast transient bursts in industrial control and power electronics applications. |
Pinout & Package
SM15T24CA is housed in an SMC (DO-214AB) surface-mount package with two terminals: Cathode (K) and Anode (A), arranged in a symmetrical bidirectional configuration. The package measures 7.75–8.15 mm × 5.55–6.25 mm × 2.45 mm max height and uses matte tin-plated leads compliant with J-STD-002 and JEDEC standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Positive terminal in forward bias; common node for bidirectional clamping path | Connects to line under protection; forms one side of symmetrical avalanche junction with Cathode. |
| Cathode (K) | Negative terminal in forward bias; common node for bidirectional clamping path | Connects to line under protection; enables identical clamping response for positive and negative transients. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping symmetry | Identical VBR (20.5–25.2 V) and VCL (33.2 V) for both polarities - simplifies layout for AC or floating signal lines without polarity marking. |
| Low dynamic resistance | RD = 0.178 Ω at 25 °C - reduces clamping voltage overshoot during high-di/dt events such as 8/20 µs surges. |
| High-temperature reliability | Rated for Tj = 150 °C with <0.2 µA leakage at 25 °C and <1 µA at 85 °C - ensures stable protection in thermally constrained enclosures. |
| Industry-standard footprint | IPC7531-compliant SMC outline with 8.19 mm × 5.11 mm pad spacing - enables drop-in replacement and automated assembly compatibility. |
| UL 497B certification | File QVGQ2.E136224 - validates suitability for primary-side telecom and data line surge protection per UL safety standards. |
Applications
| Industrial PLC Analog Input | AC/DC Power Supply Input |
|---|---|
|
Use Scenario: Protection of 4–20 mA current loop inputs against induced surges from nearby motor switching or lightning coupling. IC Role / Device Role / Timing Role: Bidirectional TVS diode placed across input terminals to clamp ±1 kV fast transients before reaching precision op-amp front-end. Use Value: Prevents latch-up or damage to instrumentation amplifiers while maintaining <0.2 µA leakage to avoid offset error in µA-level sensing. |
Use Scenario: Secondary-side surge suppression on DC output rails of switched-mode power supplies feeding sensitive logic or communication modules. IC Role / Device Role / Timing Role: Clamping device shunting transient energy from 24 V DC rail during load dump or back-EMF events. Use Value: Limits rail voltage excursion to ≤33.2 V during 1500 W surges, protecting downstream LDOs and microcontrollers rated for 36 V absolute maximum. |
| Telecom Line Interface | Automotive Body Control Module I/O |
|
Use Scenario: Protection of RS-485 transceiver bus lines exposed to ESD and inductive kickback in building automation networks. IC Role / Device Role / Timing Role: Bidirectional TVS placed across differential pair (A/B) to suppress common-mode transients without distorting signal integrity. Use Value: Maintains <1 nF junction capacitance at 1 V reverse bias, minimizing signal attenuation at 10 Mbps data rates. |
Use Scenario: Protection of LIN bus or sensor inputs (e.g., ambient temperature, door switch) in vehicle body electronics exposed to ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Standoff-rated TVS absorbing coupled transients on 12 V supply or signal lines during load dump or jump-start conditions. Use Value: Withstands 1500 W (10/1000 µs) surges at 125 °C ambient, meeting AEC-Q101 stress test requirements for under-hood placement. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ24CA (Littelfuse) | Same 24 V VRM and bidirectional SMC package, but lower PPP = 600 W (10/1000 µs); VCL = 38.9 V at 1 A. | Lower power handling limits use to sub-600 W surge environments; higher VCL increases downstream voltage stress. | Select when cost sensitivity outweighs peak surge requirement and board space allows larger footprint for SMB vs SMC. |
| P6SMB24CA (ON Semiconductor) | Identical SMC package and 24 V VRM, but PPP = 600 W and VCL = 38.9 V; leakage = 1 µA at 25 °C. | Higher leakage may affect high-impedance sensor nodes; lower power rating restricts use to non-lightning-prone locations. | Prefer for legacy designs where P6SMB series is already qualified; not recommended for new designs requiring >1 kW surge margin. |
Compared with SMBJ24CA and P6SMB24CA, SM15T24CA delivers 2.5× higher peak power (1500 W), 5.7 V lower clamping voltage, and 5× lower leakage - making it the only option among the three validated for 4 kV IEC 61000-4-4 level 4 and 30 kV ESD in compact SMC form factor.
Availability
SM15T24CA is available at Aetrix Electronics and suitable for industrial PLC analog inputs, AC/DC power supply outputs, telecom line interfaces, and automotive body control module I/O requiring stable component supply across extended temperature ranges and high-surge environments.
Supply support for SM15T24CA 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 IEC 61000-4-2/4-4/5-compliant surge protection in space-constrained, thermally demanding applications such as industrial automation and telecom infrastructure.
FAQ
What is the maximum clamping voltage of SM15T24CA under a 10/1000 µs surge?
The maximum clamping voltage (VCL) of SM15T24CA is 33.2 V at 1 A for a 10/1000 µs waveform, measured at 25 °C junction temperature. This value increases with junction temperature due to the αT coefficient of 9.4 × 10⁻⁴/°C, reaching approximately 35.1 V at 125 °C.
Is SM15T24CA compatible with lead-free reflow soldering processes?
Yes, SM15T24CA supports lead-free reflow soldering with a peak profile of 240–245 °C for 2–3 seconds, per ST's recommended JEDEC J-STD-020 MSL level 1 profile. Its matte tin-plated leads meet JESD 22-B102 E3 and MIL-STD-750 method 2026 plating specifications.
How does SM15T24CA differ from unidirectional SM15T24A?
SM15T24CA is bidirectional with symmetrical clamping for both polarities, while SM15T24A is unidirectional and clamps only in reverse bias. The CA version has identical VBR (20.5–25.2 V) and VCL (33.2 V) for positive and negative transients, enabling use on AC or floating lines without polarity orientation concerns.
What PCB footprint should be used for SM15T24CA?
SM15T24CA requires the IPC7531-compliant SMC footprint: 8.19 mm × 5.11 mm pad centerline spacing, 1.54 mm pad width, and 3.14 mm pad length. ST recommends 70 µm copper thickness on FR4 to achieve Rth(j-a) ≤ 120 °C/W and sustain full 1500 W pulse rating.
SM15T24CA 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):
- 20.5V
- Voltage - Breakdown (Min):
- 22.8V
- Voltage - Clamping (Max) @ Ipp:
- 42.8V
- Current - Peak Pulse (10/1000µs):
- 234A (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
SM15T24CA FAQ
1.How can I place an order for SM15T24CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T24CA 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 SM15T24CA reliable?
The price and inventory of SM15T24CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM15T24CA is usually 5 days.
3.What payment methods are accepted for SM15T24CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T24CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T24CA?
SM15T24CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T24CA 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 SM15T24CA?
For technical support, including SM15T24CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T24CA requirements.
6.How does Aetrix verify that SM15T24CA is sourced from the original manufacturer or authorized distributors?
All SM15T24CA 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 SM15T24CA meets industry standards.
7.What is the process for return or replacement of SM15T24CA?
All SM15T24CA units undergo pre-shipment inspection (PSI). If there is an issue with SM15T24CA, 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 SM15T24CA part is unused and in its original packaging.
Return procedure for SM15T24CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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