SM6T250CAY - 250V 600W TVS Diode | STMicroelectronics
MPN: SM6T250CAY β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.45 | $0.45 |
| 10 | $0.38 | $3.80 |
| 100 | $0.3 | $30.00 |
| 500 | $0.25 | $125.00 |
| 1,000 | $0.2 | $200.00 |
Drop-in alternatives for SM6T250CAY β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
SM6T250A
β Drop-Inπ Reference alternative (not in catalog)
SM6T250CA
β Drop-Inπ Reference alternative (not in catalog)
SMBJ250CA
β Drop-Inπ Reference alternative (not in catalog)
P6SMB250CA
β Drop-Inπ Reference alternative (not in catalog)
1SMB250CA
β Drop-Inπ Reference alternative (not in catalog)
SM6T250CAY Maximum Ratings & Electrical Characteristics
| Type | TVS Diode (Bidirectional) |
| Working Peak Reverse Voltage (VRWM) | 250 V |
| Breakdown Voltage (VBR) Min | 285 V |
| Breakdown Voltage (VBR) Max | 315 V |
| Maximum Clamping Voltage (VC) | 417 V |
| Peak Pulse Current (IPP) | 14.4 A |
| Peak Pulse Power (PPP) | 600 W |
| Leakage Current (IR) | 5 Β΅A |
| Response Time | < 1 ns |
| Package | SMB (DO-214AA) |
| Mounting Type | Surface Mount |
| Operating Temperature Range | -55Β°C to +150Β°C |
| AEC-Q101 Qualified | Yes |
| RoHS Compliant | Yes |
| REACH Compliant | Yes |
SM6T250CAY Pin Configuration
| Pin 1 | Cathode/Anode β For bidirectional, either pin can be used as input or output |
| Pin 2 | Anode/Cathode β For bidirectional, either pin can be used as input or output |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
SM6T250CAY is suitable for 6 applications: Automotive Electronic Control Units (ECUs), Industrial Automation Equipment, Telecom Infrastructure, Power Supply Protection, Renewable Energy Systems, Consumer Electronics.
Automotive Electronic Control Units (ECUs)
The SM6T250CAY protects automotive ECUs from voltage transients caused by load dump, inductive load switching, and ESD. Its AEC-Q101 qualification ensures reliability in harsh automotive environments. In a typical ECU, the TVS diode is placed across the power input to clamp surges above 250V, preventing damage to microcontrollers and sensors. The fast response time (<1ns) ensures that transients are clamped before they reach sensitive circuitry. The 600W peak pulse power rating handles high-energy transients, while the low leakage current (5Β΅A) minimizes power consumption in standby. The SMB package is compact and suitable for space-constrained ECU designs.
Recommended
Industrial Automation Equipment
In industrial automation, the SM6T250CAY safeguards PLCs, motor drives, and sensors from inductive spikes and surge events. The device is placed across power lines and signal lines to clamp overvoltages, ensuring uninterrupted operation. Its wide operating temperature range (-55Β°C to +150Β°C) allows use in harsh factory environments. The bidirectional configuration is ideal for AC-powered equipment where transients can be both positive and negative. The 600W peak pulse power rating provides robust protection against high-energy surges, while the low leakage current ensures minimal power loss. The SMB package is easy to assemble and replace, reducing maintenance costs.
Recommended
Telecom Infrastructure
The SM6T250CAY protects telecom line cards, base stations, and communication interfaces from lightning-induced surges and ESD. Its fast response time (<1ns) is critical for high-speed data lines, ensuring that transients are clamped before they corrupt data or damage components. The 600W peak pulse power rating handles the high-energy surges typical in telecom environments. The bidirectional configuration is suitable for both tip and ring lines in telephony applications. The device's low leakage current (5Β΅A) minimizes power consumption in always-on equipment. The SMB package is compact, allowing high-density board layouts.
Recommended
Power Supply Protection
The SM6T250CAY is used in power supply circuits to protect against overvoltage transients from the AC mains or load switching. It is placed at the input of the power supply to clamp surges before they reach the rectifier and regulator stages. The device's standoff voltage of 250V is suitable for 230V AC mains applications, where transients can exceed 400V. The 600W peak pulse power rating ensures it can handle typical surge events. The bidirectional configuration is ideal for AC lines, clamping both positive and negative half-cycles. The low leakage current (5Β΅A) ensures minimal power loss in standby, improving overall efficiency.
Recommended
Renewable Energy Systems
In solar inverters and wind turbine controllers, the SM6T250CAY protects power electronics from voltage transients caused by grid disturbances and lightning. The device is placed across DC bus lines and AC output lines to clamp overvoltages. Its high standoff voltage (250V) is suitable for the DC bus voltages commonly found in renewable systems. The 600W peak pulse power rating handles the high-energy surges associated with lightning strikes. The AEC-Q101 qualification ensures reliability in outdoor environments with wide temperature variations. The bidirectional configuration is useful for AC output lines, while the low leakage current minimizes power loss in high-efficiency systems.
Recommended
Consumer Electronics
The SM6T250CAY protects consumer electronics such as smart home devices, set-top boxes, and power adapters from ESD and surge events. Its compact SMB package is ideal for space-constrained designs. The fast response time (<1ns) ensures protection for high-speed interfaces like USB and HDMI. The 600W peak pulse power rating provides robust protection against typical surge events. The low leakage current (5Β΅A) is beneficial for battery-powered devices, extending battery life. The device is RoHS compliant, meeting environmental regulations for consumer products.
Recommended
Recommended Products Summary
Engineering reference data for SM6T250CAY β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | SM6T250A | SM6T250CA | SMBJ250CA | P6SMB250CA | 1SMB250CA |
|---|---|---|---|---|---|---|
| Package | SMB (DO-214AA) | SMB (DO-214AA) | SMB (DO-214AA) | SMB (DO-214AA) | SMB (DO-214AA) | SMB (DO-214AA) |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | Littelfuse | Littelfuse | onsemi |
| Polarity | Bidirectional | Unidirectional | Bidirectional | Bidirectional | Bidirectional | Bidirectional |
| Working Peak Reverse Voltage (VRWM) | 250 V | 250 V | 250 V | 250 V | 250 V | 250 V |
| Breakdown Voltage (VBR) Min | 285 V | 285 V | 285 V | 285 V | 285 V | 285 V |
| Maximum Clamping Voltage (VC) | 417 V | 417 V | 417 V | 417 V | 417 V | 417 V |
| Peak Pulse Power (PPP) | 600 W | 600 W | 600 W | 600 W | 600 W | 600 W |
| AEC-Q101 Qualified | Yes | Yes | No | No | No | No |
Key Differentiators
- AEC-Q101 qualified for automotive use (vs SMBJ250CA)
- Bidirectional protection (vs SM6T250A)
- Same package and electrical specs as cross-brand alternatives (vs P6SMB250CA)
Design Notes
Place the SM6T250CAY as close as possible to the protected component or connector to minimize trace inductance. Use short, wide traces for the TVS diode connections to reduce parasitic inductance, which can cause voltage overshoot during fast transients. A typical recommendation is to keep the trace length under 5mm and use a ground plane to provide a low-impedance path for surge currents.
The SM6T250CAY can dissipate up to 600W of peak pulse power, but this is for a short duration (10/1000Β΅s). For repetitive transients, consider the average power dissipation and derate the device based on the operating temperature. The thermal resistance of the SMB package is approximately 100Β°C/W, so ensure adequate copper area on the PCB to dissipate heat. For high-repetition-rate applications, consider a higher power TVS diode.
Ensure that the standoff voltage (250V) is higher than the maximum operating voltage of the protected line to avoid unnecessary clamping and leakage. Also, verify that the clamping voltage (417V) is lower than the maximum voltage rating of the protected components. Do not exceed the peak pulse power rating, as this can cause device failure. Always follow the recommended PCB layout and thermal guidelines in the datasheet.
Compliance Information
AEC-Q101 qualified per STMicroelectronics datasheet. RoHS and REACH compliant. Halogen-free and conflict minerals status not specified in the provided data.
