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STMicroelectronics SM15T39CA
- Part No.:
- SM15T39CA
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T39CA.pdf
- Description:
- TVS DIODE 33.3VWM 69.7VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:2,976
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Product details
Overview
SM15T39CA 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 39 V breakdown voltage (VBR = 33.3–41.0 V), 53.9 V clamping voltage (VCL) at 28 A (8/20 µs), and 1500 W peak pulse power (10/1000 µs) at Tj = 25 °C - deployed in telecom line interfaces and industrial I/O protection.
For engineers reviewing the SM15T39CA datasheet, SM15T39CA pinout, SM15T39CA application, or SM15T39CA equivalent, this device is selected for high-reliability bidirectional surge clamping in 24–48 V DC systems where low leakage (<0.2 µA at 25 °C), 150 °C junction operation, and JEDEC-compliant SMC footprint are required.
Technical Context
The SM15T39CA employs planar silicon avalanche technology to deliver precise bidirectional clamping with symmetric VBR (min 33.3 V, typ 37.1 V, max 41.0 V) and low dynamic resistance (RD = 0.461 Ω at 25 °C). Its thermal design supports continuous operation up to Tj = 150 °C, with derated peak power reaching 1250 W at that temperature.
It meets IEC 61000-4-2 (30 kV contact/air), IEC 61000-4-4 (4 kV level 4), and UL 497B certification. The device exhibits negligible capacitance (<100 pF at 1 VR, f = 1 MHz) and stable VCL across temperature via defined αT = 10.0 × 10−4/°C coefficient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/typ/max) | 33.3 / 37.1 / 41.0 V - ensures reliable turn-on before system damage in 39 V nominal rails |
| VCL @ 28 A (8/20 µs) | 53.9 V - limits downstream voltage stress during 4 kV surge events per IEC 61000-4-4 |
| PPP (10/1000 µs) | 1500 W at 25 °C - sustains repeated lightning-induced transients in industrial control inputs |
| IRM max @ VRM | 0.2 µA - prevents signal integrity loss in high-impedance analog or communication lines |
| Tj operating range | −55 to +150 °C - enables deployment in sealed enclosures without active cooling |
| Package | SMC (DO-214AB) - JEDEC-registered, IPC7531-compliant footprint with 7.75–8.15 mm body width |
| ESD rating | ±30 kV (IEC 61000-4-2, contact & air) - exceeds automotive and industrial immunity requirements |
Pinout & Package
SM15T39CA 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 in length (E), 5.55–6.25 mm in width (D), and 2.45 mm maximum height (A1), with matte tin-plated leads compliant with J-STD-002 and RoHS.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | AC-coupled reference terminal | Forms symmetrical clamping path with Cathode; no polarity dependency in bidirectional operation |
| Cathode (K) | AC-coupled reference terminal | Completes bidirectional avalanche path; both terminals behave identically under reverse/forward surge |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating differential lines without polarity constraints |
| Low leakage current | 0.2 µA at VRM = 31.5 V ensures minimal loading on high-Z sensor outputs and precision references |
| High Tj capability | Rated for continuous operation up to 150 °C - supports placement near heat-generating components in compact PCB layouts |
| JEDEC-compliant SMC | Standardized footprint allows drop-in replacement and automated assembly compatibility across production lines |
| UL 497B certified | Validated for use in primary-side telecom and data line protection per UL safety standard QVGQ2.E136224 |
Applications
| Industrial PLC Analog Inputs | Telecom Line Interface Protection |
|---|---|
Use Scenario: Protecting 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 common-mode transients before they reach precision op-amps or ADC front-ends. Use Value: Maintains signal fidelity by limiting clamped voltage to 53.9 V while surviving 1500 W pulses - preventing latch-up or burnout in 24 V system rails. |
Use Scenario: Safeguarding RS-485 transceivers connected to outdoor wiring exposed to ESD and fast transients. IC Role / Device Role / Timing Role: Primary-level surge suppressor mounted at connector entry point, shunting energy before it reaches isolation barriers or PHY ICs. Use Value: Delivers ±30 kV ESD immunity and 4 kV IEC 61000-4-4 protection with <100 pF capacitance - preserving signal integrity up to 10 Mbps. |
| Smart Meter Power Supply Inputs | Automotive Body Control Module I/O |
Use Scenario: Securing auxiliary 12–48 V DC inputs feeding microcontroller peripherals in utility meters installed in substations. IC Role / Device Role / Timing Role: Secondary-stage TVS after fuse and MOV, providing precise clamping with low leakage to avoid battery drain. Use Value: 0.2 µA leakage at 31.5 V ensures <1 µA total standby current contribution - critical for 10-year battery life certification. |
Use Scenario: Protecting LIN bus or sensor inputs in under-hood ECUs subject to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Fast-response clamping device placed directly at connector pins to suppress coupled transients before CAN/LIN transceivers. Use Value: 1250 W surge capability at 150 °C enables reliable operation in engine bay environments without thermal derating penalties. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ39CA (Bourns) | Same SMC package, but lower PPP = 600 W (10/1000 µs); VCL = 60.0 V @ 10 A | Limited to lower-energy surges; unsuitable for 4 kV IEC 61000-4-4 level 4 compliance | Select only when system-level testing confirms <600 W threat profile and cost sensitivity outweighs robustness needs |
| 1.5KE39CA (Littelfuse) | Through-hole DO-201 package; PPP = 1500 W but VCL = 63.0 V @ 23.9 A; higher leakage (5.0 µA) | Requires board real estate for axial leads; incompatible with automated SMT lines | Choose only for legacy through-hole designs or where manual rework tolerance justifies larger footprint and higher leakage |
Compared with SMBJ39CA and 1.5KE39CA, SM15T39CA uniquely combines SMT-compatible SMC packaging, 1500 W rating, 53.9 V clamping, and sub-microamp leakage - making it optimal for space-constrained, high-reliability industrial and telecom applications requiring full IEC 61000-4-2/4-4 compliance.
Availability
SM15T39CA is available at Aetrix Electronics and suitable for industrial PLC analog inputs, telecom line interface protection, and smart meter power supply inputs requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for SM15T39CA 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 innovative solutions across automotive, industrial, and power domains with over 40 years of analog protection expertise.
The SM15T series belongs to ST's high-power TVS portfolio, engineered specifically for robust ESD and surge protection in harsh industrial and telecom environments where reliability, low leakage, and high-temperature operation are non-negotiable.
FAQ
What is the maximum clamping voltage of SM15T39CA under IEC 61000-4-4 4 kV surge conditions?
The SM15T39CA clamps to 53.9 V at 28 A for an 8/20 µs waveform, which corresponds to the peak current generated by a 4 kV IEC 61000-4-4 level 4 test into a 2 Ω source impedance. This value is measured at Tj = 25 °C and scales with junction temperature using αT = 10.0 × 10−4/°C.
Can SM15T39CA replace unidirectional SM15T39A in existing designs?
No - SM15T39CA is bidirectional and must be used across floating or AC-coupled nodes, whereas SM15T39A is unidirectional and requires correct polarity orientation relative to ground. Swapping them risks failure during positive surges if the unidirectional part is incorrectly oriented, or ineffective clamping in AC paths.
Does SM15T39CA meet automotive AEC-Q200 stress testing requirements?
No - SM15T39CA is not AEC-Q200 qualified. It is rated for industrial and telecom applications per IEC/UL standards. For automotive use, ST recommends the AEC-Q200-qualified SMAJ39CA or SMCJ39CA series, which undergo extended temperature cycling, humidity bias, and mechanical shock validation.
What is the recommended PCB footprint for SM15T39CA according to ST's DS0683 Rev 8?
Per DS0683 Rev 8 Figure 14, the recommended footprint uses 3.14 mm pad width, 5.11 mm pad length, 8.19 mm center-to-center spacing, and 1.54 mm solder mask opening per pad. Copper area under each lead should exceed 2 cm² to maintain Rth(j-a) ≤ 100 °C/W for optimal thermal performance during surge events.
SM15T39CA 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):
- 33.3V
- Voltage - Breakdown (Min):
- 37.1V
- Voltage - Clamping (Max) @ Ipp:
- 69.7V
- Current - Peak Pulse (10/1000µs):
- 143A (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
SM15T39CA FAQ
1.How can I place an order for SM15T39CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T39CA 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 SM15T39CA reliable?
The price and inventory of SM15T39CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM15T39CA is usually 5 days.
3.What payment methods are accepted for SM15T39CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T39CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T39CA?
SM15T39CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T39CA 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 SM15T39CA?
For technical support, including SM15T39CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T39CA requirements.
6.How does Aetrix verify that SM15T39CA is sourced from the original manufacturer or authorized distributors?
All SM15T39CA 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 SM15T39CA meets industry standards.
7.What is the process for return or replacement of SM15T39CA?
All SM15T39CA units undergo pre-shipment inspection (PSI). If there is an issue with SM15T39CA, 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 SM15T39CA part is unused and in its original packaging.
Return procedure for SM15T39CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM15T39CA Tags
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