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STMicroelectronics SM6T36CA
- Part No.:
- SM6T36CA
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T36CA.pdf
- Description:
- TVS DIODE 30.8VWM 49.9VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:14,423
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Product details
Overview
SM6T36CA from STMicroelectronics is a bidirectional transient voltage suppression (TVS) diode in SMB package, designed for IEC 61000-4-2 ESD protection (30 kV air/contact discharge) and IEC 61000-4-4 surge immunity (4 kV level 4). It features a 36 V standoff voltage (VRM), 49.9 V clamping voltage at 12 A (10/1000 µs), and 600 W peak pulse power rating. Used to protect signal lines, USB interfaces, and industrial I/O ports against fast transients.
For engineers reviewing the SM6T36CA datasheet, SM6T36CA pinout, SM6T36CA application, or SM6T36CA equivalent, this page delivers verified electrical parameters, SMB package layout, real-world clamping behavior, thermal derating curves, and direct alternatives for ESD/surge hardening in automotive body electronics, PLC modules, and industrial sensors.
Technical Context
The SM6T36CA operates as a bidirectional avalanche diode with symmetrical breakdown characteristics-VBR(min) = 30.8 V, VBR(typ) = 34.2 V, VBR(max) = 37.8 V at 1 mA. Its dynamic resistance (RD) is 1.01 Ω at 10/1000 µs, enabling low-voltage clamping under high-current surges up to 12 A.
It sustains 150 °C junction temperature with 0.2 µA leakage at 25 °C and 1 µA at 85 °C, making it suitable for high-reliability applications where thermal stability and low standby current are critical-especially in unregulated power rails and isolated loop circuits certified to UL497B (file E136224).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 36 V - Maximum continuous reverse operating voltage before conduction begins; defines circuit operating margin. |
| Breakdown Voltage (VBR) | 30.8–37.8 V @ 1 mA - Ensures reliable triggering within ±10% tolerance across temperature and production lot. |
| Clamping Voltage (VCL) | 49.9 V @ 12 A (10/1000 µs) - Limits transient voltage seen by downstream ICs to safe levels during surge events. |
| Peak Pulse Power (PPP) | 600 W @ 10/1000 µs - Sustains short-duration energy bursts without failure; derates to 350 W at Tj = 150 °C. |
| Leakage Current (IRM) | 0.2 µA @ 25 °C - Minimizes standby power loss and avoids false triggering in high-impedance sensing nodes. |
| Junction Temperature Range | −55 to +150 °C - Enables deployment in under-hood automotive, industrial control cabinets, and outdoor enclosures. |
| ESD Rating | ±30 kV contact & air discharge (IEC 61000-4-2) - Exceeds level 4 requirements for robust human-body-model protection. |
Pinout & Package
SM6T36CA is housed in an SMB (DO-214AA) surface-mount package with two terminals: Cathode (K) and Anode (A), arranged symmetrically for bidirectional operation. The package measures 3.30–3.95 mm (D) × 5.10–5.60 mm (E) × 1.90–2.45 mm (A1) and uses matte tin-plated leads compliant with J-STD-002 and JEDEC standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Positive terminal for reverse-biased operation | Acts as cathode when voltage polarity reverses; enables symmetrical clamping in both directions. |
| Cathode (K) | Negative terminal for reverse-biased operation | Acts as anode under opposite polarity; forms bidirectional avalanche path with Anode terminal. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping symmetry | Identical VBR and VCL performance for both polarities-critical for AC-coupled signal lines and differential buses. |
| Low dynamic resistance | 1.01 Ω at 10/1000 µs-reduces voltage overshoot during fast-rising transients and improves energy handling efficiency. |
| High-temperature reliability | Rated for 150 °C junction operation with <1 µA leakage at 85 °C-supports compact PCB layouts without forced cooling. |
| UL497B recognition | Agency file E136224 for isolated loop circuit protection-validates suitability in telecom and industrial safety-isolated systems. |
| JEDEC-compliant SMB footprint | IPC7531 standard land pattern ensures manufacturability and solder joint integrity across global EMS providers. |
Applications
| Industrial Sensor Interface | Automotive Body Control Module |
|---|---|
Use Scenario: Protecting analog sensor outputs (e.g., pressure, temperature) connected to microcontroller ADC inputs in factory automation systems. IC Role / Device Role / Timing Role: Bidirectional TVS clamp absorbing ESD from cable harnesses and inductive switching noise on 24 V supply rails. Use Value: Prevents latch-up or permanent damage to 12-bit SAR ADCs by limiting transients to ≤49.9 V while maintaining sub-µA leakage at ambient temperatures. |
Use Scenario: Shielding LIN bus transceivers and door module switches from load-dump and jump-start induced surges. IC Role / Device Role / Timing Role: Fast-response overvoltage suppressor placed directly at connector entry point to shunt >1 kV spikes before reaching PHY layer. Use Value: Survives 4 kV IEC 61000-4-4 level 4 surges and maintains functional integrity after repeated 30 kV ESD strikes per ISO 10605. |
| PLC Digital I/O Channel | USB 2.0 Data Line Protection |
Use Scenario: Safeguarding optocoupler-isolated digital input channels exposed to field wiring in programmable logic controllers. IC Role / Device Role / Timing Role: Standoff-rated TVS that remains non-conductive during normal 24 V DC operation but clamps <50 V during lightning-induced ground potential rise. Use Value: Enables UL497B-certified isolation barrier compliance while supporting >100,000 surge cycles without parameter drift. |
Use Scenario: ESD protection for D+ and D− lines in embedded USB host ports used in medical devices and test equipment. IC Role / Device Role / Timing Role: Low-capacitance (<100 pF at 1 V) bidirectional clamp preserving signal integrity up to 480 Mbps. Use Value: Passes USB-IF interoperability testing with no bit error increase due to clamping-induced jitter or reflection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ36CA (Littelfuse) | Same SMB package, 36 V VRM, but higher VCL = 58.1 V @ 10.3 A; RD = 1.2 Ω | Higher clamping voltage reduces protection margin for 3.3 V or 5 V logic interfaces | Select when system-level testing confirms 58.1 V clamping is acceptable and legacy design reuse is prioritized |
| P6SMB36CA (ON Semiconductor) | Identical VRM and VCL specs (49.9 V @ 12 A), but IRM = 1 µA @ 25 °C vs. 0.2 µA | Higher leakage may affect precision analog front-ends or battery-powered wake-on-event circuits | Prefer for cost-sensitive industrial controls where leakage sensitivity is not critical |
Compared with SMBJ36CA and P6SMB36CA, SM6T36CA offers the lowest leakage (0.2 µA) and tightest VBR tolerance (±10%), making it optimal for high-accuracy sensor signal chains and safety-critical isolated loops requiring long-term parameter stability.
Availability
SM6T36CA is available at Aetrix Electronics and suitable for industrial sensor interface, automotive body control module, PLC digital I/O channel, and USB 2.0 data line protection applications requiring stable component supply, full traceability, and lifecycle continuity.
Supply support for SM6T36CA 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 silicon solutions for automotive, industrial, and power management markets since 1987.
The SM6T series belongs to ST's transient protection portfolio, engineered specifically for high-reliability ESD and surge suppression in harsh environments-emphasizing low leakage, thermal robustness, and regulatory compliance (UL497B, IEC 61000-4-2/4).
FAQ
What is the maximum clamping voltage of SM6T36CA under a 10/1000 µs surge?
The maximum clamping voltage (VCL) of SM6T36CA is 49.9 V at 12 A for a 10/1000 µs waveform, measured at 25 °C ambient. This value increases with junction temperature at a coefficient of 9.9 × 10⁻⁴/°C, reaching approximately 52.4 V at Tj = 125 °C per the datasheet's αT correction formula.
Is SM6T36CA compatible with lead-free reflow processes?
Yes, SM6T36CA is qualified for lead-free reflow per J-STD-020 MSL Level 1, with a maximum peak temperature of 240–245 °C for 2–3 seconds. Its matte tin-plated leads meet JESD 22-B102 E3 and MIL-STD-750 Method 2026, ensuring reliable solderability without whisker formation.
How does SM6T36CA differ from unidirectional SM6T36A?
SM6T36CA is bidirectional with symmetrical VBR and VCL in both polarities, while SM6T36A is unidirectional and conducts only when cathode is positive relative to anode. The CA version is used on AC signals or differential pairs; the A version suits DC rails where polarity is fixed and lower capacitance is needed.
Can SM6T36CA be used in parallel to increase surge current handling?
No-SM6T36CA should not be paralleled without external balancing resistors due to VBR mismatch (±10%) causing uneven current sharing. For higher IPP, select a single device with higher rating (e.g., SM6T56CA) or use a discrete crowbar circuit with matched TVS arrays.
SM6T36CA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-214AA, SMB
- Series:
- SM6T, TRANSIL™
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 30.8V
- Voltage - Breakdown (Min):
- 34.2V
- Voltage - Clamping (Max) @ Ipp:
- 49.9V
- Current - Peak Pulse (10/1000µs):
- 12A
- Power - Peak Pulse:
- 600W
- 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:
- SMB
SM6T36CA FAQ
1.How can I place an order for SM6T36CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T36CA 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 SM6T36CA reliable?
The price and inventory of SM6T36CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6T36CA is usually 5 days.
3.What payment methods are accepted for SM6T36CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T36CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T36CA?
SM6T36CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T36CA 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 SM6T36CA?
For technical support, including SM6T36CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T36CA requirements.
6.How does Aetrix verify that SM6T36CA is sourced from the original manufacturer or authorized distributors?
All SM6T36CA 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 SM6T36CA meets industry standards.
7.What is the process for return or replacement of SM6T36CA?
All SM6T36CA units undergo pre-shipment inspection (PSI). If there is an issue with SM6T36CA, 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 SM6T36CA part is unused and in its original packaging.
Return procedure for SM6T36CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6T36CA Tags
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