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STMicroelectronics SM15T150CA
- Part No.:
- SM15T150CA
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SM15T150CA.pdf
- Description:
- TVS DIODE 128VWM 265VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:820
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Product details
Overview
SM15T150CA 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 150 V standoff voltage (VRM), 207 V clamping voltage at 38 A (10/1000 µs), and 1500 W peak pulse power rating. Used in telecom line interfaces, industrial I/O modules, and AC/DC power supply inputs requiring robust overvoltage resilience.
For engineers reviewing the SM15T150CA datasheet, SM15T150CA pinout, SM15T150CA application, or SM15T150CA equivalent, this page delivers verified electrical parameters, thermal derating behavior, junction capacitance curves, leakage current vs. temperature, and SMC footprint compliance per IPC7531 and JEDEC MO-136.
Technical Context
The SM15T150CA employs planar silicon avalanche technology to achieve low dynamic resistance (RD = 2.82 Ω at 25 °C) and stable clamping performance across temperature. Its bidirectional structure enables symmetrical surge suppression on AC-coupled or floating signal lines without polarity constraints.
It operates with a maximum junction temperature of +150 °C and maintains ≤0.2 µA reverse leakage at VRM = 150 V and 25 °C. Clamping voltage increases linearly with junction temperature via αT = 10.8 × 10⁻⁴ /°C, enabling accurate system-level overvoltage margining under thermal stress.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 150 V - Maximum continuous reverse operating voltage before significant leakage; defines minimum circuit working voltage compatibility. |
| Breakdown Voltage (VBR) | 128–158 V at 1 mA - Confirmed avalanche onset range; ensures reliable triggering above normal operating transients. |
| Clamping Voltage (VCL) | 207 V at 38 A (10/1000 µs) - Peak voltage seen by protected circuit during worst-case surge; determines downstream component voltage rating. |
| Peak Pulse Power (PPP) | 1500 W (10/1000 µs) - Sustained energy-handling capability at ambient; derates to 1250 W at Tj = 150 °C per Figure 3. |
| Leakage Current (IRM) | ≤0.2 µA at VRM = 150 V, 25 °C - Minimal loading on high-impedance signal paths; critical for sensor front-ends and precision references. |
| Junction Capacitance (CJ) | 4.6 nF at 0 V (f = 1 MHz) - Measured bidirectional capacitance; impacts high-frequency signal integrity in data lines & RF interfaces. |
| Dynamic Resistance (RD) | 2.82 Ω at 25 °C - Low impedance during conduction; reduces clamping overshoot and improves surge current sharing in parallel configurations. |
Pinout & Package
SM15T150CA is housed in an SMC (DO-214AB) surface-mount package compliant with JEDEC MO-136 and IPC7531 footprints. Dimensions: 7.75–8.15 mm length × 5.55–6.25 mm width × 2.45 mm height (max), with matte tin-plated leads rated for 260 °C soldering (10 s).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Cathode side marked) | Surge current sink path in negative half-cycle | Enables bidirectional clamping: conducts during both positive and negative transients relative to circuit reference. |
| Cathode (Marked band) | Surge current sink path in positive half-cycle | Provides symmetrical low-impedance path to ground/rail for ± surges; no external polarity selection required. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional surge suppression | Eliminates need for dual unidirectional devices or external polarity management in AC or floating systems. |
| Low leakage (≤0.2 µA @ 150 V) | Preserves signal fidelity and battery life in always-on IoT sensors and low-power industrial monitors. |
| High Tj max (150 °C) | Supports operation in enclosed enclosures or near heat-generating components without derating penalties. |
| IEC 61000-4-2 Level 4 compliance (30 kV) | Meets stringent ESD immunity requirements for industrial control panels and field-deployable equipment. |
| JEDEC MO-136 / IPC7531 footprint | Ensures drop-in PCB compatibility with standard SMC land patterns and automated assembly processes. |
Applications
| Industrial PLC Analog Inputs | AC/DC Power Supply Input Protection |
|---|---|
|
Use Scenario: Protecting 4–20 mA current loop receivers from induced surges on long field wiring in factory automation. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed across input terminals to shunt fast transients before reaching op-amp front-end. Use Value: Prevents latch-up or damage to precision instrumentation amplifiers while maintaining <0.2 µA bias error at 150 V standoff. |
Use Scenario: Safeguarding bridge rectifier outputs and bulk capacitor charging paths against lightning-induced surges in DIN-rail power supplies. IC Role / Device Role / Timing Role: Primary surge limiter mounted directly at AC input stage to absorb 1500 W (10/1000 µs) energy before downstream MOVs or fuses activate. Use Value: Reduces reliance on slower-acting MOVs, lowering let-through voltage to <207 V and extending capacitor lifetime under repeated surge stress. |
| Telecom Line Interface Cards | Smart Meter Communication Ports |
|
Use Scenario: Shielding RS-485 transceivers connected to outdoor copper loops exposed to induced surges in utility infrastructure. IC Role / Device Role / Timing Role: Bidirectional clamping device placed differential-mode across A/B bus lines to suppress common-mode and differential-mode transients. Use Value: Maintains <4.6 nF junction capacitance to avoid signal distortion at 10 Mbps, while surviving 4 kV IEC 61000-4-4 bursts. |
Use Scenario: Securing HAN (Home Area Network) ports like M-Bus or PLC modems against ESD events during field technician handling. IC Role / Device Role / Timing Role: Final-stage ESD guard on communication interface pins, rated for 30 kV contact discharge per IEC 61000-4-2. Use Value: Achieves zero failure rate in production ESD testing due to sub-0.2 µA leakage and stable VBR drift (<±5%) over 10-year field deployment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ150CA (Bourns) | Same 150 V VRM, but lower PPP = 600 W (10/1000 µs); RD = 4.2 Ω; higher VCL = 243 V @ 25 A. | Limited to lower-energy surges; less effective in high-current AC line protection where 1500 W headroom is required. | Select when cost sensitivity outweighs surge margin needs and board space allows larger SMB footprint. |
| P6SMB150CA (Littelfuse) | Identical VRM and VCL specs, but IRM = 1 µA (5× higher leakage); Tj max = 175 °C; different thermal resistance profile. | Higher leakage may affect ultra-low-power metering circuits; superior thermal endurance suits high-ambient transformerless designs. | Prefer for high-temperature environments (>125 °C ambient), but verify leakage impact on analog front-end accuracy. |
Compared with SMBJ150CA and P6SMB150CA, SM15T150CA delivers optimal balance of low leakage (0.2 µA), high surge capacity (1500 W), and tight clamping (207 V), making it preferred for precision industrial I/O where signal integrity and reliability coexist under thermal stress.
Availability
SM15T150CA is available at Aetrix Electronics and suitable for industrial PLC analog inputs, AC/DC power supply input protection, and telecom line interface cards requiring stable component supply across extended product lifecycles and volume ramp phases.
Supply support for SM15T150CA 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, protection devices, and microcontrollers for industrial, automotive, and consumer markets.
The SM15T series belongs to ST's high-reliability TVS portfolio engineered specifically for demanding industrial and telecom surge environments where low leakage, precise clamping, and thermal stability are non-negotiable.
FAQ
What is the maximum clamping voltage of SM15T150CA under a 10/1000 µs surge?
The maximum clamping voltage is 207 V at 38 A for a 10/1000 µs waveform, measured at Tj = 25 °C. This value increases with junction temperature at a coefficient of αT = 10.8 × 10⁻⁴ /°C, reaching ~229 V at Tj = 150 °C per the VCL vs. Tj formula in DS0683.
Does SM15T150CA meet IEC 61000-4-5 surge immunity standards?
No - SM15T150CA is rated for IEC 61000-4-4 (electrical fast transients) up to 4 kV level 4 and IEC 61000-4-2 (ESD) up to 30 kV. IEC 61000-4-5 requires higher energy handling (e.g., 10/700 µs waveforms), which exceeds its 1500 W (10/1000 µs) rating; use dedicated 10/700 µs TVS or hybrid protectors for that standard.
Can SM15T150CA be used in parallel to increase surge current handling?
Yes, but only with matched units and symmetric PCB layout. Its low dynamic resistance (2.82 Ω) supports current sharing, yet mismatched VBR or thermal gradients can cause imbalance. Derate total IPP by ≥20% and ensure equal trace inductance to each device per ST application guidance in AN4124.
Is the SMC package of SM15T150CA compatible with standard reflow profiles?
Yes - it complies with J-STD-020 MSL level 1 and supports ST's recommended reflow profile: peak temperature 240–245 °C for ≤60 s, ramp rates ≤3 °C/s, and cooling rate ≥2 °C/s. Matte tin plating ensures reliable wetting without voiding on FR4 boards with 70 µm Cu.
SM15T150CA 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):
- 128V
- Voltage - Breakdown (Min):
- 143V
- Voltage - Clamping (Max) @ Ipp:
- 265V
- Current - Peak Pulse (10/1000µs):
- 38A (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
SM15T150CA FAQ
1.How can I place an order for SM15T150CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SM15T150CA 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 SM15T150CA reliable?
The price and inventory of SM15T150CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM15T150CA is usually 5 days.
3.What payment methods are accepted for SM15T150CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM15T150CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM15T150CA?
SM15T150CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM15T150CA 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 SM15T150CA?
For technical support, including SM15T150CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM15T150CA requirements.
6.How does Aetrix verify that SM15T150CA is sourced from the original manufacturer or authorized distributors?
All SM15T150CA 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 SM15T150CA meets industry standards.
7.What is the process for return or replacement of SM15T150CA?
All SM15T150CA units undergo pre-shipment inspection (PSI). If there is an issue with SM15T150CA, 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 SM15T150CA part is unused and in its original packaging.
Return procedure for SM15T150CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM15T150CA Tags
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