Surge Protectors
Products (4)
SM15T10AY - 1500W TVS Diode, 10V Standoff | STMicroelectronics
The SM15T10AY is a 1500W transient voltage suppression (TVS) diode from STMicroelectronics, designed to protect sensitive electronic circuits from voltage transients induced by lightning, inductive load switching, and electrostatic discharge (ESD). It features a standoff voltage of 10V (working peak reverse voltage) and a breakdown voltage range of 11.1V to 12.3V at 1mA test current. The device is housed in the SMC (DO-214AB) package, a surface-mount package with a compact footprint suitable for high-density PCB designs. A TVS diode is a clamping device that, when exposed to a transient voltage exceeding its breakdown voltage, conducts high current to clamp the voltage to a safe level, thereby protecting downstream components. TVS diodes are essential in power supply inputs, communication lines, and automotive electronics where transient surges are common. They are part of the broader category of circuit protection devices, which also includes varistors, gas discharge tubes, and ESD suppressors. Key features of the SM15T10AY include a peak pulse power dissipation of 1500W (10/1000us waveform), a maximum clamping voltage of 18.6V at 83A peak pulse current, and a low leakage current of 200uA at the standoff voltage. The device operates over a junction temperature range of -55C to +150C, making it suitable for harsh environments. It is RoHS compliant and halogen-free, meeting modern environmental standards. The SM15T10AY utilizes a silicon avalanche diode structure, providing fast response times (typically less than 1ns) and high surge capability. The SMC package offers excellent thermal performance, with a thermal resistance of 15C/W (junction to lead), enabling efficient heat dissipation during surge events. The device is AEC-Q101 qualified, making it suitable for automotive applications where reliability under extreme conditions is critical. Typical applications include automotive electronic control units (ECUs), industrial power supplies, telecom equipment, and consumer electronics. In automotive systems, the SM15T10AY protects sensitive microcontrollers and sensors from load-dump transients and ESD. In industrial power supplies, it safeguards rectifier circuits and DC-DC converters from lightning-induced surges. When designing with the SM15T10AY, ensure adequate PCB copper area for heat dissipation during surge events. The device should be placed as close as possible to the protected component or connector to minimize parasitic inductance. For high-reliability designs, consider derating the peak pulse power at elevated ambient temperatures.
SM15T56AY - 56V 1500W TVS Diode | STMicroelectronics | Automotive
The SM15T56AY is a 1500W transient voltage suppression (TVS) diode from STMicroelectronics, designed to protect sensitive electronic circuits from voltage transients induced by lightning, inductive load switching, and electrostatic discharge (ESD). It features a standoff voltage of 56V (working peak reverse voltage) and a breakdown voltage range of 62.2V to 68.8V at 1mA test current. The device clamps transient overvoltages to a maximum clamping voltage of 100V at a peak pulse current of 15.4A (for a 10/1000μs waveform), ensuring downstream components remain within safe operating limits. A TVS diode is a semiconductor device that responds to overvoltage conditions by entering avalanche breakdown, shunting excess current to ground and clamping the voltage to a safe level. TVS diodes are essential in power management and circuit protection hierarchies, sitting between the external threat (ESD, surge) and the sensitive load (ICs, microcontrollers). They are categorized under transient voltage suppressors, which are a subset of protection diodes within the broader family of discrete semiconductors. The SM15T56AY is part of the SM15T series, which offers peak pulse power ratings from 600W to 1500W, with the 'A' suffix indicating a unidirectional (single-direction) device. Key features include a peak pulse power dissipation of 1500W (10/1000μs), a fast response time of less than 1 picosecond (theoretical), and a low leakage current of 5μA maximum at the standoff voltage. The device is housed in a compact SMC (DO-214AB) package, which is surface-mountable and provides excellent thermal performance. The SM15T56AY is AEC-Q101 qualified, making it suitable for automotive applications where reliability under harsh conditions is critical. It also meets RoHS and REACH compliance standards, ensuring environmental friendliness. Technically, the SM15T56AY uses a planar epitaxial silicon structure that provides precise breakdown voltage control and high surge capability. The device's clamping behavior is characterized by its dynamic resistance, which is low enough to minimize voltage overshoot during fast transients. The unidirectional configuration is ideal for DC power rails where the voltage is always positive with respect to ground, offering a single clamping direction and lower clamping voltage compared to bidirectional devices. Typical applications include automotive electronic control units (ECUs), industrial power supplies, telecommunications equipment, and consumer electronics. In automotive systems, the SM15T56AY protects 12V and 24V battery lines from load-dump transients and inductive spikes. In industrial settings, it safeguards PLCs and motor drives from surge events. The device's high surge capability and fast response make it a preferred choice for protecting power input stages. When designing with the SM15T56AY, ensure the standoff voltage (56V) is higher than the maximum steady-state operating voltage of the protected line to avoid unnecessary clamping during normal operation. Place the TVS diode as close as possible to the protected component or connector to minimize parasitic inductance, which can degrade clamping performance. Proper PCB layout with short, wide traces to the TVS and a solid ground plane is essential for optimal transient suppression.
SM6T250CAY - 250V 600W TVS Diode | STMicroelectronics
The SM6T250CAY is a bidirectional transient voltage suppression (TVS) diode from STMicroelectronics, designed to protect sensitive electronic circuits from voltage transients induced by lightning, inductive load switching, and electrostatic discharge (ESD). It offers a standoff voltage of 250V and a peak pulse power dissipation of 600W (10/1000µs waveform), making it suitable for industrial, automotive, and telecom applications. The device is available in the compact SMB (DO-214AA) surface-mount package, which is widely used for board-level protection. A TVS diode is a clamping device that limits voltage spikes to a safe level by entering avalanche breakdown when the voltage across it exceeds its breakdown voltage. It is a type of voltage suppressor, which falls under the broader category of circuit protection components. TVS diodes are essential in protecting integrated circuits, power supplies, and communication lines from overvoltage events that could otherwise cause permanent damage. Key features of the SM6T250CAY include a working peak reverse voltage (VRWM) of 250V, a minimum breakdown voltage (VBR) of 285V, and a maximum clamping voltage (VC) of 417V at the peak pulse current (IPP) of 14.4A. The device has a low leakage current of 5µA at VRWM, ensuring minimal power loss in standby. It also features a fast response time of less than 1ns, which is critical for protecting high-speed data lines. The SMB package offers a compact footprint with a height of only 2.44mm, making it suitable for space-constrained designs. The SM6T250CAY is fabricated using STMicroelectronics' planar technology, which ensures precise voltage control and high reliability. The device is AEC-Q101 qualified, making it suitable for automotive applications where reliability under harsh conditions is paramount. It also complies with RoHS and REACH directives, ensuring environmental friendliness. The bidirectional configuration allows it to clamp both positive and negative transients, making it ideal for AC lines and applications where the polarity of the transient is unknown. Typical applications include automotive electronic control units (ECUs), industrial automation equipment, telecom infrastructure, and power supply protection. In automotive systems, the SM6T250CAY protects against load dump transients and ESD events, ensuring the longevity of sensitive electronics. In industrial settings, it safeguards PLCs and motor drives from inductive spikes. For telecom, it protects line cards and communication interfaces from lightning-induced surges. When designing with the SM6T250CAY, ensure that the standoff voltage (250V) is higher than the maximum operating voltage of the protected line to avoid unnecessary clamping. Also, consider the peak pulse power rating (600W) and derate it based on the operating temperature. Proper PCB layout with short, low-inductance traces is essential to minimize parasitic effects and ensure effective clamping.
SMA4F5.0AY - 5.0V TVS Diode, SMA Flat Package | STMicroelectronics
The SMA4F5.0AY is a 5.0V unidirectional Transient Voltage Suppression (TVS) diode from STMicroelectronics, designed to protect sensitive electronic circuits from voltage transients induced by lightning, inductive load switching, and electrostatic discharge (ESD). It is housed in a compact SMA flat package (SMAflat), which offers a low-profile, surface-mount solution with excellent power dissipation capability. The device provides a standoff voltage of 5.0V and a breakdown voltage range of 6.4V to 7.0V, ensuring robust clamping performance for low-voltage applications. A TVS diode is a semiconductor device that clamps transient voltages to a safe level by entering avalanche breakdown when the voltage exceeds its breakdown voltage. It is a critical component in circuit protection, acting as a voltage clamp that diverts excess energy away from sensitive ICs, microcontrollers, and communication interfaces. TVS diodes are part of the broader category of circuit protection devices, which also include varistors, ESD suppressors, and gas discharge tubes. In the system hierarchy, a TVS diode is a fundamental building block in the protection layer of electronic systems, working alongside fuses and current limiters to ensure reliability and safety. Key features of the SMA4F5.0AY include a peak pulse power dissipation of 400W (10/1000µs waveform), a low clamping factor, and a fast response time of less than 1ns. The device operates over a wide temperature range of -55°C to +150°C, making it suitable for harsh environments. Its SMAflat package is designed for automated assembly, with a height of only 1.0mm, ideal for space-constrained applications. The device is RoHS compliant and halogen-free, meeting modern environmental standards. Technically, the SMA4F5.0AY utilizes a planar epitaxial structure that ensures low leakage current and high surge capability. The device's clamping voltage at peak pulse current is typically 9.2V, providing effective protection for 5V logic and power rails. The TVS diode's bidirectional or unidirectional configuration is determined by the application; the SMA4F5.0AY is unidirectional, making it suitable for DC power lines and signal lines where the voltage is always positive. Typical applications include protection of power supply inputs, I/O ports, and communication lines in consumer electronics, industrial control systems, automotive electronics, and telecommunications equipment. For example, in a USB power port, the SMA4F5.0AY can be placed across the VBUS line to clamp ESD events, ensuring the downstream controller remains undamaged. When designing with this device, it is essential to place the TVS diode as close as possible to the protected connector or IC to minimize parasitic inductance. Additionally, the PCB layout should include a low-impedance ground path to ensure effective clamping. The device's standoff voltage should be higher than the maximum operating voltage of the protected line to avoid unnecessary conduction during normal operation.