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STMicroelectronics SM6T200A
- Part No.:
- SM6T200A
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SM6T200A.pdf
- Description:
- TVS DIODE 171VWM 274VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:8,621
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Product details
Overview
SM6T200A from STMicroelectronics is a unidirectional transient voltage suppression (TVS) diode in SMB package, designed for high-energy surge protection of sensitive electronics. It delivers 600 W peak pulse power (10/1000 µs), clamps transients up to 274 V at 2.2 A, and operates with ≤0.2 µA leakage at 25 °C - ideal for industrial power supply input stages and telecom line interfaces.
For engineers reviewing the SM6T200A datasheet, SM6T200A pinout, SM6T200A application, or SM6T200A equivalent, key selection criteria include standoff voltage (VRM = 171 V), clamping voltage (VCL = 274 V @ IPP = 2.2 A), junction temperature range (–55 to +150 °C), and UL497B recognition for isolated loop circuit protection.
Technical Context
This TVS diode uses planar silicon technology to achieve low leakage current and stable clamping performance across its full operating junction temperature range (–55 to +150 °C). Its dynamic resistance (RD = 12.7 Ω) and temperature coefficient (αT = 10.8 × 10⁻⁴/°C) ensure predictable voltage rise under surge conditions.
The device complies with IEC 61000-4-2 (±30 kV contact/air discharge) and IEC 61000-4-4 level 4 (4 kV), making it suitable for protecting MOSFET gates, DC-DC converter inputs, and RS-485 transceivers against ESD and inductive switching transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 171 V - maximum continuous reverse working voltage before significant leakage begins |
| Breakdown Voltage (VBR) | 200 V min @ IBR = 1 mA - precise threshold where avalanche conduction initiates |
| Clamping Voltage (VCL) | 274 V @ IPP = 2.2 A (10/1000 µs) - peak voltage seen by protected circuit during surge |
| Peak Pulse Power (PPP) | 600 W (10/1000 µs) - energy-handling capability for standard lightning-surge waveforms |
| Leakage Current (IRM) | 0.2 µA @ VRM, 25 °C - minimal loading on high-impedance signal or bias networks |
| Junction Temperature (Tj) | –55 to +150 °C - enables reliable operation in enclosed industrial enclosures and SMPS environments |
| UL Recognition | UL497B, file E136224 - certified for use as isolated loop circuit protector in safety-critical systems |
Pinout & Package
SM6T200A is housed in an SMB (DO-214AA) surface-mount package with two terminals: cathode (marked end) and anode. The matte tin-plated leads comply with J-STD-002, JESD 22-B102 E3, and MIL-STD-750 method 2026 solderability standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (marked end) | Surge current sink | Connected to protected line; conducts avalanche current to ground during overvoltage events |
| Anode | Reference node | Typically tied to system ground or lower-potential rail; completes clamping path |
Key Features
| Feature | Design Value |
|---|---|
| High surge robustness | 600 W (10/1000 µs) and 350 W at Tj = 150 °C - maintains protection margin in thermally stressed PCB layouts |
| Low-temperature drift | αT = 10.8 × 10⁻⁴/°C - ensures <±5% VBR shift over full –55 to +150 °C range |
| Ultra-low leakage | ≤0.2 µA @ 25 °C, ≤1 µA @ 85 °C - preserves accuracy in high-impedance sensor biasing and feedback networks |
| Fast response time | <1 ps - clamps ESD events before IC damage thresholds are exceeded |
| Industry-standard footprint | IPC7531-compliant SMB outline - enables drop-in replacement and automated assembly compatibility |
Applications
| Industrial Power Input Protection | Telecom Line Interface |
|---|---|
|
Use Scenario: 24–48 V DC input stage of programmable logic controllers exposed to load dump and inductive switching noise. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between input rail and chassis ground to limit transient overvoltage. Use Value: Clamps 4 kV IEC 61000-4-4 surges to ≤274 V, preventing damage to upstream DC-DC converters and microcontroller power rails. |
Use Scenario: RS-485 data lines in outdoor base stations subject to lightning-induced surges. IC Role / Device Role / Timing Role: Primary surge suppressor on differential bus lines, coordinated with common-mode chokes. Use Value: Withstands ±30 kV IEC 61000-4-2 ESD without degradation, maintaining signal integrity and link uptime. |
| AC/DC Adapter Secondary Side | MOSFET Gate Protection |
|
Use Scenario: Output rectifier side of offline flyback adapters powering IoT gateways. IC Role / Device Role / Timing Role: Reverse-biased TVS across output capacitor to absorb transformer leakage spikes. Use Value: Limits overshoot to <274 V during no-load to full-load transitions, extending electrolytic capacitor life. |
Use Scenario: Gate-source protection of 600 V SiC MOSFETs in motor drive half-bridges. IC Role / Device Role / Timing Role: Low-capacitance TVS (CJ ≈ 100 pF @ 100 V) placed directly across gate and source pins. Use Value: Prevents gate oxide rupture from dV/dt-induced coupling during high-speed switching, with <0.2 µA leakage preserving drive strength. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ200A (Bourns) | Same SMB package, VRM = 170 V, VCL = 324 V @ 2.2 A - 50 V higher clamping voltage | Less effective for circuits with tight voltage margins below 280 V | Prefer SM6T200A when clamping headroom is constrained; SMBJ200A suits higher-voltage tolerant designs |
| P6SMB200A (Littelfuse) | Identical VRM/VBR specs but RD = 14.5 Ω - 14% higher dynamic resistance than SM6T200A's 12.7 Ω | Slightly reduced surge current handling at same clamping voltage | SM6T200A offers tighter VCL control and better thermal stability (αT = 10.8 vs. 11.0 × 10⁻⁴/°C) |
Compared with SMBJ200A and P6SMB200A, SM6T200A provides the lowest clamping voltage (274 V) and dynamic resistance (12.7 Ω) in the 200 V standoff class, enabling superior protection for voltage-sensitive loads while maintaining UL497B certification and low-temperature drift.
Availability
SM6T200A is available at Aetrix Electronics and suitable for industrial power supplies, telecom infrastructure equipment, and automotive body control modules requiring stable component supply and long-term lifecycle support.
Supply support for SM6T200A 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, and protection devices for industrial, automotive, and consumer markets.
SM6T200A belongs to ST's high-reliability TVS diode product line, engineered specifically for robust surge immunity in harsh environments - emphasizing low leakage, wide temperature operation, and regulatory compliance for safety-critical applications.
FAQ
What is the maximum clamping voltage of SM6T200A under a 10/1000 µs surge?
The maximum clamping voltage (VCL) of SM6T200A is 274 V when subjected to a 2.2 A peak pulse current with a 10/1000 µs waveform. This value is measured at Tamb = 25 °C and scales with junction temperature using αT = 10.8 × 10⁻⁴/°C, reaching ~288 V at Tj = 150 °C.
Does SM6T200A meet IEC 61000-4-2 and IEC 61000-4-4 requirements?
Yes - SM6T200A exceeds IEC 61000-4-2 level 4 with ±30 kV air and contact discharge ratings, and meets IEC 61000-4-4 level 4 (4 kV) for fast transient burst immunity. These capabilities are validated per ST's DS0684 test reports and confirmed in UL497B file E136224.
Can SM6T200A be used in bidirectional configurations?
No - SM6T200A is unidirectional only. For bidirectional protection at the same standoff voltage, ST offers SM6T200CA (marked OU), which features symmetrical clamping in both polarities and identical electrical specs except for polarity behavior and marking.
What is the recommended PCB footprint for SM6T200A?
The recommended footprint follows IPC7531 and JEDEC MO-136 outlines: pad length 2.60 mm, pad width 1.62 mm, center-to-center spacing 5.84 mm, and copper area ≥2.0 cm² per lead for optimal thermal dissipation. ST's DS0684 Figure 14 provides exact dimensions in millimeters and inches.
SM6T200A 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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 171V
- Voltage - Breakdown (Min):
- 190V
- Voltage - Clamping (Max) @ Ipp:
- 274V
- Current - Peak Pulse (10/1000µs):
- 2.2A
- 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
SM6T200A FAQ
1.How can I place an order for SM6T200A through Aetrix?
Please submit a Request for Quotation (RFQ) for SM6T200A 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 SM6T200A reliable?
The price and inventory of SM6T200A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM6T200A is usually 5 days.
3.What payment methods are accepted for SM6T200A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM6T200A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM6T200A?
SM6T200A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM6T200A 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 SM6T200A?
For technical support, including SM6T200A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM6T200A requirements.
6.How does Aetrix verify that SM6T200A is sourced from the original manufacturer or authorized distributors?
All SM6T200A 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 SM6T200A meets industry standards.
7.What is the process for return or replacement of SM6T200A?
All SM6T200A units undergo pre-shipment inspection (PSI). If there is an issue with SM6T200A, 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 SM6T200A part is unused and in its original packaging.
Return procedure for SM6T200A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SM6T200A Tags
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