Surge Protectors
Products (130)
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.
SM4T33A - 33V 400W TRANSIL TVS Diode | STMicroelectronics
The STMicroelectronics SM4T33A is a 33V unidirectional TRANSIL transient voltage suppressor (TVS) diode rated for 400W peak pulse power dissipation on a 1ms exponential waveform, packaged in the surface-mount SMA (DO-214AC) outline. It belongs to ST's SM4T series, which is JEDEC-registered and designed for high-overvoltage protection by clamping action in sensitive electronics. A TRANSIL is a specific class of avalanche TVS diode whose role is to clamp transient overvoltages (ESD, inductive load switching, lightning-induced surges) to a safe level, protecting downstream semiconductors. TVS diodes sit within the broader protection-component hierarchy of surge protectors, which themselves fall under discrete semiconductors used in power management and interface protection. SM4T-series parts are positioned as general-purpose surface-mount TVS diodes with a low clamping factor and a fast response time, intermediate in power handling between SMA-packaged 400W parts and larger SMB/SMC 1000W-1500W parts. Key electrical features of the SM4T33A include a stand-off voltage (VWM) of 33V, a minimum breakdown voltage (VBR min) around 36.7V, a maximum clamping voltage (VC) of approximately 53.3V at IPP, and a peak pulse current handling compatible with the 400W/1ms rating. The device is offered in unidirectional (-A suffix) and bidirectional (-CA suffix) variants, providing flexibility for DC rail protection and AC line protection respectively. The low clamping factor minimizes the voltage excursion seen by protected circuitry during a transient event. Architecturally, the SM4T33A uses a silicon pn-junction avalanche structure optimized for fast turn-on (typically sub-nanosecond response), and the SMA package's C-bend terminations provide a robust solder joint capable of withstanding the thermal stress of repeated surge events. Maximum junction temperature is 150C with operating range typically -55C to +150C (per the SMA TRANSIL datasheet family). Typical applications include DC power rail protection in 24V industrial systems, protection of microcontroller I/O pins, secondary protection on telecom line interfaces, USB and CAN bus protection, and general ESD/surge protection on PCB signal lines exposed to external cables. The unidirectional polarity suits DC rails, while bidirectional variants suit AC or signal-line applications. When designing with the SM4T33A, ensure the working voltage is below VWM and that the protected device's maximum rating exceeds VC. Place the TVS as close as possible to the entry point of the transient, with short, wide PCB traces to minimize parasitic inductance that would otherwise let voltage overshoot during fast-edge transients. This page synthesizes distributor pricing, drop-in SMA-package alternatives, and practical PCB-layout design notes not collected in the manufacturer datasheet alone, giving the engineer a single reference for sourcing and design-in decisions.
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.
SMA6J43CA - 600W Bidirectional TVS Diode 43V | Littelfuse
The Littelfuse SMA6J43CA is a 600 W bidirectional transient voltage suppressor (TVS) diode with a 43 V reverse standoff voltage, 47.7 V minimum breakdown voltage, and 69.4 V maximum clamping voltage at 8.7 A peak pulse current, housed in a DO-214AC (SMA) surface-mount package. A TVS diode is a silicon avalanche protection device clamped in parallel with the circuit it protects. Within the power-management hierarchy, it belongs to the surge protector family alongside varistors and gas discharge tubes; unlike MOVs, silicon TVS diodes respond in picoseconds with tightly controlled clamping voltages, making them the preferred choice for protecting sensitive semiconductors from electrostatic discharge (ESD), inductive load switching, and lightning-induced transients. Key features include the 600 W peak pulse power rating (10/1000 us waveform), bidirectional polarity that blocks and clamps in both directions, 5% breakdown voltage tolerance, and a steady-state power dissipation of 5.0 W. The glass-passivated junction ensures long-term reliability, and the response time is typically less than 1.0 ns, fast enough to intercept ESD events per IEC 61000-4-2 type threats. The SMA6J43CA uses a planar, glass-passivated avalanche junction structure. Its bidirectional construction consists of two avalanche junctions in series-opposed configuration, giving symmetric clamping at 69.4 V for both positive and negative surge events - important for AC lines, symmetric signal pairs, and circuits that see reverse transients. Typical applications include automotive 42 V rail transient protection, industrial 24-36 V DC bus clamping, telecom line cards, and surge protection on power input stages of motor drives and power supplies. The 43 V standoff accommodates nominal 36-40 V rails with margin. Design consideration: at 8.7 A peak, the package must dissipate the surge energy into copper - provide at least adequate PCB copper area on both SMA terminals. Remember the bidirectional CA suffix means leakage flows in both directions; use the unidirectional SMA6J43A for DC rails where a clamping diode forward drop is acceptable. This page synthesizes verified distributor data, drop-in cross-brand alternatives, and practical design notes not found in the manufacturer datasheet.
SMA6J43CA-Q - 600W 43V Bidirectional TVS Diode | Bourns
The Bourns SMA6J43CA-Q is a 600 W bidirectional transient voltage suppressor (TVS) diode with a 43 V working standoff voltage, 69.4 V max clamping voltage, and 8.7 A peak pulse current capability, housed in a surface-mount DO-214AC (SMA) package. The -Q suffix denotes AEC-Q101 qualification for automotive-grade reliability. A transient voltage suppressor diode is a circuit-protection semiconductor designed to clamp fast voltage transients, such as those caused by inductive load switching, lightning-induced surges, and electrostatic discharge (ESD). TVS diodes sit within the broader voltage-suppression hierarchy that spans varistors, gas discharge tubes, and TVS thyristors. When a transient exceeds the breakdown voltage, the TVS avalanches within nanoseconds and diverts surge current to ground, clamping the protected rail to a safe level. Key features of the SMA6J43CA-Q include 600 W peak pulse power per the 10/1000 us waveform, 5% breakdown voltage tolerance, bidirectional polarity for AC lines and symmetric signal protection, and a glass-passivated junction for long-term stability. The SMA package supports surface-mount reflow assembly and roughly 5.0 W steady-state power dissipation. The SMA6J-Q series is specified for voltage transient and ESD protection in data lines and DC power supplies. Typical applications include automotive 24 V and 42 V rail protection, industrial DC bus clamping, telecom line cards, and surge protection at power input connectors of harsh-environment equipment. When designing with this device, remember that the 43 V standoff means the diode begins conducting near 47.8 V minimum breakdown; downstream circuits must tolerate the 69.4 V worst-case clamp at full 8.7 A surge. Ground-path inductance must be minimized so the clamp voltage is not inflated during fast transients. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
SMA6S18CAH - 18V Bi-Directional 600W TVS Diode | TSC
The Taiwan Semiconductor Corporation SMA6S18CAH is a 600 W bi-directional Transient Voltage Suppressor (TVS) diode rated for an 18 V working standoff voltage, packaged in the compact surface-mount SOD-128 case. Designed to clamp fast transient events such as ESD surges, inductive load switching, and lightning-induced transients, the device offers a peak pulse current capability of 20.5 A (Ipp) and a maximum clamping voltage of 29.2 V at that current. A Transient Voltage Suppressor is a specialized PN-junction diode optimized for avalanche breakdown operation. Under normal circuit conditions the TVS diode presents a high impedance and is effectively invisible to the signal or supply rail it protects. When the voltage across the device exceeds its breakdown (avalanche) voltage, the TVS diode conducts heavily and shunts the transient energy away from sensitive downstream components. Bi-directional TVS diodes such as the SMA6S18CAH clamp both positive and negative transients symmetrically, making them ideal for AC-coupled signal lines, differential data pairs, and DC supply rails where the polarity of the disturbance is undefined. Key electrical characteristics include a stand-off voltage (Vrwm) of 18 V, breakdown voltage (Vbr) typically 20 V, and a clamping voltage (Vc) of 29.2 V at 20.5 A peak pulse current. The 600 W peak pulse power rating is specified at a 10/1000 microsecond waveform per industry-standard TVS test methods. The device is housed in a SOD-128 (also known as SMA-flat) low-profile surface-mount package that is pin-compatible with the industry-standard SMA footprint, enabling direct substitution on existing PCB land patterns. Typical applications include protection of 12 V or 15 V DC power rails in industrial control systems, automotive electronic control units (ECUs), USB and HDMI data-line protection, and protection of signal lines on factory automation buses such as RS-485 and CAN. The fast response time (sub-nanosecond avalanche) makes the SMA6S18CAH well-suited for safeguarding microcontroller I/O pins and sensor interfaces from electrostatic discharge events. When designing with this device, ensure the working standoff voltage (Vrwm) exceeds the maximum continuous operating voltage of the protected line, and select a clamping voltage (Vc) safely below the absolute maximum rating of the downstream component. PCB layout should minimize parasitic inductance between the TVS diode and the protected line, with short, wide traces to the ground plane to ensure effective transient energy dissipation.
SMBJ15CA - 600W Bidirectional TVS Diode, 15V, DO-214AA | SMBJ Series
The Littelfuse SMBJ15CA is a 600W peak-pulse-power bidirectional Transient Voltage Suppressor (TVS) diode housed in a surface-mount DO-214AA (SMB) package. Designed for bipolar operation, it offers a working standoff voltage of 15.0V, a breakdown voltage of approximately 16.7V, and a maximum clamping voltage of 24.4V at a peak pulse current of 24.6A (10/1000 µs waveform). The 'C' suffix denotes bidirectional construction, allowing it to clamp transients of either polarity across the protected line. A TVS diode is a clamping semiconductor device that protects sensitive downstream electronics by absorbing high-energy voltage transients (such as those induced by lightning, ESD, inductive load switching, or relay kickback) and shunting the surge current to ground. Within the broader component taxonomy, a TVS diode is a sub-category of surge protection devices, which fall under the discrete semiconductor family. TVS diodes complement, but do not replace, over-current protection: they react in nanoseconds and are the fastest solid-state surge clamp available, far faster than MOVs or GDTs. Key features include 600W peak pulse power (10/1000 µs), 24.6A peak pulse current, a tight ±5% breakdown tolerance, low incremental surge resistance, and a robust glass-passivated die construction. The DO-214AA package offers an industry-standard SMB footprint compatible with all major second-source suppliers, including Vishay, STMicroelectronics, Diodes Incorporated, Micro Commercial Components (MCC), Microchip, and Bourns. Technically, the SMBJ15CA is built on a junction-passivated PN structure optimized for fast avalanche breakdown. Its response time is sub-nanosecond, and its clamping ratio (Vc/Vbr) of approximately 1.46 reflects the device's low dynamic impedance during a surge event. The bidirectional design eliminates the need for orientation on the PCB, simplifying assembly. Typical applications include 12V/15V rail protection in industrial control systems, DC power supply outputs exposed to load dump transients, telecom line protection, USB and CAN bus protection, sensor input clamping, and secondary protection downstream of GDTs or PTCs. When designing with this device, ensure the trace width to the SMB pads can carry the rated peak pulse current (24.6A) and that the PCB thermal mass keeps the junction temperature within rated limits during repeated surge events. Pair with an upstream fuse or PTC for over-current coordination. This page synthesizes distributor pricing, verified drop-in alternatives, and practical design notes not consolidated in any single manufacturer datasheet.
SMBJ15CA-TR - 600W 15V Bidirectional TVS Diode | STMicroelectronics
The STMicroelectronics SMBJ15CA-TR is a 600 W peak-pulse bidirectional TRANSIL transient voltage suppressor (TVS) diode rated at 15 V standoff, housed in a surface-mount SMB (DO-214AA) package. It clamps transients to a maximum 24.4 V across its leads while handling up to 25.1 A of peak pulse current on a 10/1000 us waveform, making it well suited for hard-to-protect DC rails and signal lines in industrial, automotive, and consumer equipment. A TVS diode is a specialized clamping semiconductor placed in parallel with a sensitive load. Under normal operation it presents a high impedance, but when the line voltage exceeds its breakdown threshold it avalanches rapidly, diverting transient energy away from downstream circuitry. TVS diodes sit hierarchically within circuit protection components (TVS -> protection diode -> discrete semiconductor -> semiconductor). They are the fastest-responding overvoltage clamp available, with sub-nanosecond turn-on and the ability to absorb multi-kW pulses that would destroy Zener-based or MOV solutions. Key specifications of the SMBJ15CA-TR include a 15 V working standoff voltage (VWM), 16.7 V minimum breakdown voltage (VBR), and a 25.1 A peak pulse current (IPP) at 10/1000 us. Clamping voltage (VC) is 24.4 V maximum at IPP, and leakage current at VWM is below 1 uA. The part is bidirectional (suffix "CA"), so the same orientation works for positive or negative-going transients. It is qualified to IEC 61000-4-2 (ESD), IEC 61000-4-4 (EFT), and MIL STD 883 method 3015 standards, fulfilling EMI/ESD immunity requirements for most electronics designs. Typical applications include 12-15 V DC rail protection in PLCs and industrial sensors, USB/VBUS clamps, RS-485 and CAN bus transient suppression, secondary protection on telecom line cards, and automotive 12 V load-dump networks (when paired with a higher-rated companion). The SMB package provides a low thermal resistance path to the PCB copper pad, allowing the pulsed energy to be absorbed without degrading the die. When laying out the SMBJ15CA-TR, keep the body as close to the protected connector or rail as possible and maximize the copper area on both pads to keep the clamp voltage low during high-current pulses. A nearby 1 nF-100 nF ceramic bypass capacitor suppresses residual high-frequency ringing.
SMBJ28CA-E3/52 - 28V 600W Bidirectional TVS Diode | Vishay SMB
The Vishay SMBJ28CA-E3/52 is a 600 W surface-mount TRANSZORB Transient Voltage Suppressor (TVS) in a bidirectional configuration, packaged in the DO-214AA (SMB) footprint. It features a 28 V typical reverse standoff voltage (Vrwm), a 31.1 V minimum breakdown voltage, and clamps transients at 45.5 V while conducting up to 13.2 A of peak pulse current (Ipp) on a 10/1000 µs waveform. A Transient Voltage Suppressor (TVS) is a clamping semiconductor device engineered to shunt fast voltage transients away from sensitive electronics. Within the power-protection hierarchy, a TVS sits between passive suppressors (varistors, TVS diodes) and active protection ICs (eFETs, hot-swap controllers). Bidirectional TVS parts like the SMBJ28CA-E3/52 are built on a glass-passivated chip junction, giving them symmetrical V-I characteristics and making them ideal for AC or differential DC signal lines where neither polarity can be excluded. Key features include ±5 % breakdown voltage tolerance (VBR), 600 W peak pulse power on a 10/1000 µs waveform, a low-profile SMB body suitable for automated pick-and-place, and a glass-passivated die for long-term reliability. The Vishay SMBJ-C series is qualified for AEC-Q101 automotive variants and supports both uni- and bidirectional parts, simplifying BOM across mixed-polarity rails. The device uses a planar PN-junction avalanche architecture. During a transient event, the junction enters avalanche breakdown at VBR and clamps the line to its rated clamping voltage Vc, dissipating the transient energy as heat. The 0.01 % duty-cycle rating and fast response (<1 ns) make it well suited to repetitive ESD and inductive-switching surges without thermal fatigue. Typical applications include protection of 24 V industrial buses, automotive 12 V/24 V powertrain lines, RS-485/RS-232 transceivers, and DC-DC converter input rails. Its 600 W rating also covers most lightning-induced surge requirements on outdoor equipment. The bidirectional behavior lets a single part protect both polarities of a differential pair, reducing component count. When designing in this part, verify that the working voltage of the protected rail stays below 28 V continuous and that the maximum clamping voltage 45.5 V does not exceed the absolute maximum rating of the downstream IC. Route the TVS as close as possible to the connector or vulnerable pin, with short, wide traces to minimize parasitic inductance. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, providing engineers with a faster path from selection to production.
SMBJ5.0A - 600W 5V TVS Diode, DO-214AA | Littelfuse
The Littelfuse SMBJ5.0A is a 600 W unidirectional TVS (transient voltage suppressor) diode with a 5.0 V reverse stand-off voltage, 6.4 V to 7.0 V breakdown voltage range, and a maximum clamping voltage of 9.2 V at 65.3 A peak pulse current, housed in the surface-mount DO-214AA (SMB) package. A TVS diode is a silicon avalanche protection device placed across sensitive circuit nodes to clamp fast high-energy transients such as ESD, EFT, inductive load switching spikes, and lightning-induced surges. Within the power-protection hierarchy, TVS diodes sit above small ESD arrays in surge capability and are a core element of any input-protection subsystem in a power management design. Key features of the SMBJ5.0A include the industry-standard 600 W peak pulse power rating (10/1000 us waveform), very fast response to transient events, low clamping voltage for a 5 V rail, and glass-passivated junction construction for reliability. The unidirectional polarity makes it ideal for low-voltage DC lines where the transient has a defined polarity. Technically, the device exploits the silicon avalanche breakdown effect: below the breakdown voltage it is essentially non-conducting with low leakage, and during a surge it avalanches in nanoseconds, diverting the surge current to ground while holding the node near the 9.2 V maximum clamp. This protects downstream ICs, MOSFETs, and signal interfaces that exceed a 5 V absolute maximum rating. Typical applications include 5 V DC power-input protection in consumer electronics, transient suppression on 24 V industrial control signal lines with series current limiting, automotive low-voltage rail protection, and surge immunity design per IEC 61000-4-2 and IEC 61000-4-4 test environments as cited by STMicroelectronics for the same SMBJ series. Design consideration: the SMBJ5.0A clamps at up to 9.2 V, so the protected device must tolerate this level, or a lower-clamp ESD array should be added downstream. Keep the TVS trace short to minimize parasitic inductance, which otherwise raises the effective clamp voltage during fast edges. This page adds value beyond the datasheet: distributor pricing tiers, five multi-source drop-in alternatives, an 8-parameter comparison table, and practical surge-protection design notes synthesized in one place.
SMBJ5.0A-13-F - 600W TVS Diode 5V | Diodes Inc
The Diodes Incorporated SMBJ5.0A-13-F is a 600 W unidirectional surface-mount transient voltage suppressor (TVS) diode with a 5 V reverse standoff voltage, 9.2 V maximum clamping voltage at 65.2 A peak pulse current, housed in the industry-standard SMB (DO-214AA) 2-pin package. A TVS diode is a type of overvoltage protection device that clamps fast voltage transients - such as ESD, EFT, lightning-induced surges, and inductive load-switching spikes - by avalanching within nanoseconds and diverting surge current away from the protected circuit. TVS diodes sit within the broader hierarchy of circuit protection devices alongside varistors and gas discharge tubes, offering the fastest response and tightest clamping of the three. Key features of the SMBJ5.0A-13-F include 600 W peak pulse power dissipation (10/1000 us waveform), a low 6.4 V minimum breakdown voltage for a 5 V standoff, a 7.23 V breakdown typical figure, and a low leakage current of 800 uA at standoff. The glass-passivated die construction ensures stable avalanche characteristics and long-term reliability across the -55C to +150C operating range. The unidirectional construction clamps positive transients to 9.2 V maximum and conducts negative transients as a forward-biased diode at approximately 0.7 V, making it ideal for protecting DC power rails, USB lines, RS-485 interfaces, and low-voltage sensor inputs. The -13-F suffix denotes Diodes Incorporated's lead-free, RoHS-compliant tape-and-reel packing variant of the standard SMBJ5.0A. Typical applications include 5 V DC power bus protection, automotive 12 V auxiliary rail clamping, consumer electronics power entry protection, and industrial I/O port surge suppression where DO-214AA footprints are already laid out. Design consideration: verify the clamping voltage headroom - the 9.2 V maximum clamp must remain below the absolute maximum rating of the downstream IC; at 5 V rails, most logic tolerates this, but check low-voltage LDO inputs carefully. This page synthesizes distributor pricing, verified drop-in alternatives from multiple manufacturers, and practical design notes not found in the manufacturer datasheet.
SMBJ5.0A-E3/52 - 600W 5V Unidirectional TVS Diode | Vishay
The Vishay General Semiconductor - Diodes Division SMBJ5.0A-E3/52 is a 600 W unidirectional surface-mount TransZorb transient voltage suppressor (TVS) diode with a 5.0 V reverse standoff voltage, a minimum breakdown voltage of 6.4 V, a maximum clamping voltage of 9.2 V at 65.2 A peak pulse current, housed in the JEDEC DO-214AA (SMB) package. A TVS diode is a silicon avalanche device engineered to clamp fast-rising voltage transients before they can destroy sensitive downstream electronics. Within the power-management hierarchy, TVS diodes form the first line of circuit protection, sitting upstream of varistors and ESD arrays for higher-energy events, and complementing fuses and PTC devices that address sustained overcurrent faults. Key features of the SMBJ5.0A-E3/52 include 600 W peak pulse power capability on a 10/1000 us waveform at a 0.01% duty cycle, very fast response time to transient overvoltage, low incremental surge resistance, a glass-passivated chip junction for long-term reliability, and a low-profile body that is ideal for automated pick-and-place assembly. The /52 grade features matte tin-plated, lead-free terminals in a UL94 V-0 flame-rated moulding compound. Technically, the device operates through avalanche breakdown: when a surge such as an inductive load switching spike or a lightning-induced transient exceeds the 6.4 V minimum breakdown threshold, the junction conducts within nanoseconds and diverts surge current to ground, clamping the node below the 9.2 V maximum. The 5% breakdown tolerance grade ('A' suffix) gives designers tighter predictable protection thresholds than the standard tolerance grade. Typical applications include protection of low-voltage DC supply rails (5 V logic and USB power), input protection on automotive and industrial sensor signal lines, shielding ICs and MOSFETs against switching-induced transients, and IEC 61000-4-2 style ESD robustness at board-level interfaces in consumer, computer, and telecommunication equipment. A key design consideration is derating: peak pulse power scales down as ambient temperature rises and as surge duration extends beyond the 10/1000 us reference waveform, so engineers should verify clamping against the full line waveform spectrum rather than only the datasheet point. This page synthesizes verified distributor pricing, drop-in alternatives from multiple manufacturers, and practical design notes not consolidated in the manufacturer datasheet alone.
SMBJ5.0A-F1-0000HF - 600W 5V TVS Diode SMB | Yangjie
The Yangjie (Yangzhou Yangjie Electronic Technology) SMBJ5.0A-F1-0000HF is a 600 W unidirectional transient voltage suppressor (TVS) diode with a 5 V reverse working voltage, 6.4 V minimum breakdown voltage, and 9.2 V maximum clamping voltage at 65.3 A peak pulse current, housed in the surface-mount DO-214AA (SMB) package. A TVS diode is a silicon avalanche protection device placed across sensitive circuit nodes to clamp fast high-energy transients such as ESD strikes, inductive load switching spikes, and lightning-induced surges. In the power-management hierarchy it sits in the overvoltage-protection layer, upstream of regulators, interfaces, and ICs that cannot tolerate transient excursions above their absolute maximum ratings. Key features of the SMBJ5.0A-F1-0000HF include a 600 W peak pulse power rating (10/1000 us waveform), low dynamic resistance that keeps clamping voltage close to 9.2 V at full surge current, fast response to transient events (effectively instantaneous avalanche action), and a glass-passivated junction for reliability. The -F1 suffix and HF marking denote the Yangjie reel-code variant with halogen-free construction. Technically, the device uses a planar, glass-passivated avalanche junction that transitions from standby leakage to full conduction within nanoseconds of the transient exceeding breakdown. Unidirectional polarity means it clamps positive surges by avalanche breakdown and negative surges by forward conduction at approximately 0.7 V, making it ideal for protecting DC power rails referenced to ground. Typical applications include 5 V DC rail protection in industrial PLCs, USB and low-voltage port surge suppression, automotive module secondary protection, and telecom equipment front ends where IEC 61000-4-2 style ESD events must be absorbed. Design consideration: because the standoff voltage is only 5 V, verify worst-case rail tolerance stays below 5 V, or leakage and clamping behavior will be compromised; for 5 V-tolerant rails with headroom issues, consider a higher-standoff SMBJ variant. This page adds value beyond the datasheet by synthesizing cross-brand drop-in alternatives, distributor pricing context, and practical PCB layout guidance in one place.
SMBJ5.0AHE3_A/H - 600W 5V TVS Diode SMB AEC-Q101 | Vishay
The Vishay General Semiconductor SMBJ5.0AHE3_A/H is a 600 W unidirectional surface-mount TransZorb transient voltage suppressor (TVS) diode with a 5.0 V reverse standoff voltage, 65.2 A peak pulse current capability, and 9.2 V maximum clamping voltage, housed in the JEDEC SMB (DO-214AA) package. A TVS diode is a silicon avalanche-type overvoltage protection device placed across sensitive circuit nodes to clamp fast voltage transients, such as electrostatic discharge (ESD), inductive load switching spikes, and induced lightning surges. Within the power-protection hierarchy, TVS diodes sit alongside varistors and gas discharge tubes, but offer the fastest response time (sub-nanosecond avalanche action) and the tightest clamping, making them the preferred choice for low-voltage semiconductor protection. Key features of this HE3-grade part include a 600 W peak pulse power rating (10/1000 us waveform per the SMBJ family datasheet), a very tight breakdown voltage tolerance of 5 percent (the HE suffix series), AEC-Q101 automotive qualification for high-reliability designs, and an extended operating junction temperature range suited to demanding environments. The unidirectional polarity provides a low forward diode drop for negative-going transients. Technically, the device exploits a controlled silicon avalanche junction: the 5.0 V working peak reverse voltage (VRWM) ensures it stays non-conducting during normal 5 V rail operation, while breakdown occurs between the min/max breakdown window when a transient arrives, diverting up to 65.2 A of surge current to ground and holding the clamped node below 9.2 V. Typical applications include protection of 5 V logic rails, USB power lines, sensor signal lines, automotive module inputs, and industrial IO ports exposed to inductive switching or surge events. Design consideration: at 5 V standoff, PCB creepage and trace current-carrying capability for surge currents of tens of amps must be verified, and the TVS should be placed close to the connector with a low-inductance ground return. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
SMBJ6.0CA - 600W 6V Bi-Dir TVS Diode | Littelfuse | Surge
The Littelfuse SMBJ6.0CA is a 600 W bi-directional surface-mount transient voltage suppressor (TVS) diode with a 6.0 V reverse stand-off voltage, 6.67 V breakdown voltage, and 10.3 V maximum clamping voltage at 58.3 A peak pulse current, housed in the DO-214AA (SMBJ) package. A TVS diode is a clamping overvoltage-protection device that responds to transient events in picoseconds, diverting surge current away from sensitive ICs. Within the power-electronics hierarchy, the TVS diode sits under surge protectors and voltage references in the broader family of circuit-protection components, complementing fuses and varistors in a layered protection scheme. Key features of the SMBJ6.0CA include a 600 W peak pulse power rating (10/1000 us waveform per the SMBJ family datasheet), glass-passivated chip construction for low leakage current, and a bi-directional configuration (the C suffix) that clamps transients of both polarities - ideal for AC lines and bidirectional signal interfaces. The package supports surface-mount reflow assembly on standard land patterns. The device protects against voltage transients induced by inductive load switching and lightning per the Littelfuse SMBJ series datasheet, and the ST SMBJ series variant is designed for ESD protection per IEC 61000-4-2 and MIL STD 883 Method 3015. Response time is at the nanosecond level, making it effective against fast-rising ESD and switching spikes that slower varistors cannot catch. Typical applications include protection of I/O interfaces, VCC power buses, 5V and 3.3V logic rails, automotive inductive-load switching nodes, and industrial control equipment. Placing the SMBJ6.0CA directly across the rail to be protected clamps surges before downstream ICs see destructive voltage levels. Design tip: choose a stand-off voltage at or above the maximum continuous operating voltage of the rail - at 6.0 V stand-off, the SMBJ6.0CA suits 5V logic rails with margin, while its leakage current remains low at normal operating voltage. This page synthesizes distributor pricing, verified drop-in alternatives from Littelfuse, STMicroelectronics, Diodes Incorporated, Microchip and Yangjie, plus practical design notes not found in a single manufacturer datasheet.
SMCJ33A - 1500W 33V Uni-Directional TVS Diode | Littelfuse
The Littelfuse SMCJ33A is a 1500W peak-pulse-power unidirectional Transient Voltage Suppressor (TVS) diode rated at 33V working standoff voltage, supplied in the industry-standard DO-214AB (SMC) surface-mount package. The device clamps at 53.3V maximum and absorbs up to 28.2A of peak pulse current (Ipp) on a 10/1000µs waveform, providing robust secondary protection against lightning-induced transients, inductive load switching, and ESD events on DC power rails and signal lines. A TVS diode is a solid-state avalanche device engineered to remain non-conductive at normal circuit voltages and to conduct sharply above its breakdown threshold, shunting transient energy away from sensitive downstream components. The 1500W SMCJ family belongs to the broader class of voltage-clamp suppressors, which sit between linear regulators and Zener diodes in a power-tree-of-compromise breakdown hierarchy. SMCJ parts are the 1500W successors to the older 600W SMBJ and 400W SMAJ series, sharing identical DO-214 family footprints but offering 2.5x to 3.7x higher surge handling. Key features include a glass-passivated die for stable leakage characteristics, low incremental surge resistance, fast response time of less than 1 ps from 0 V to Vbr minimum, and a low profile suitable for pick-and-place assembly. The DO-214AB package provides a flat heatslug and built-in strain relief that improves board-level reliability under thermal cycling. The Littelfuse variant is halogen-free and RoHS compliant, with a typical reverse leakage below 1 µA at the working voltage. The SMCJ33A uses a uni-directional avalanche junction fabricated in a single-polarity die construction. Because the device is uni-directional it must be oriented correctly with the cathode connected to the protected node, otherwise forward conduction will occur on negative transients. The 33V standoff is the optimal match for 24V industrial buses (with ±20% tolerance) and 28V avionics rails, clamping before downstream components reach their 40-50V absolute-maximum ratings. Typical applications include 24V industrial PLC input protection, telecom equipment -48V rectifier side protection (paired with a bidirectional part), automotive 24V truck body controller protection, RS-485/Profibus transceiver protection, and PoE port protection on the secondary side. The DO-214AB footprint allows reuse of existing land patterns designed for the SMCJ series. The wide operating temperature range of -55°C to +150°C supports both outdoor industrial and under-hood automotive deployments. When designing with the SMCJ33A, observe maximum lead soldering temperature, and place the device as close as possible to the input terminal or connector to minimize parasitic inductance in the protected loop. For applications exposed to negative surges, select the SMCJ33CA bidirectional variant instead. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
SMCJ33A-AT - 1500W 33V Uni-Directional TVS | DO-214AB
The SMCJ33A-AT is a 1500 W uni-directional surface-mount transient voltage suppressor (TVS) diode housed in a DO-214AB (SMC) package, designed to clamp voltage transients on power and signal lines. It features a working standoff voltage of 33 V, a minimum breakdown voltage of 36.7 V, and a maximum clamping voltage of 53.3 V at the 28.2 A peak pulse current (Ipp), with a peak pulse power rating of 1500 W for a 10/1000 µs waveform. The device is uni-directional (A-suffix), making it suitable for DC bus protection where only positive transients are of concern. A Transient Voltage Suppressor (TVS) diode is a clamping semiconductor device that diverts destructive transient energy away from sensitive downstream circuitry. When the line voltage exceeds the breakdown threshold, the TVS transitions from a high-impedance state to a low-impedance avalanche mode within picoseconds, shunting surge current to ground and clamping the voltage to a safe level. The DO-214AB (SMC) package family is the 1500 W workhorse of the TVS market, sitting in the hierarchy: TVS diode → ESD/transient protection → discrete semiconductor → circuit protection component. Key features of the SMCJ33A-AT include a fast response time of typically less than 1 ps from 0 V to VBR(min), glass-passivated junction construction for stable leakage and long-term reliability, a low-profile body for compact board layouts, built-in strain relief for robust surface-mount soldering, and excellent clamping capability per IEC 61000-4-2 (ESD) and IEC 61000-4-4/5 (EFT/surge) guidelines. The repetitive duty cycle is rated at 0.05%, with typical reverse leakage under 1 µA at the working voltage. The SMCJ33A-AT is widely used for secondary protection of 24 V industrial buses, automotive 12 V/24 V load-dump suppression, telecom -48 V rectifier output rails, and protection of DC/DC converter inputs from inductive kickback. It also appears in USB Type-C PD, RS-485/RS-232 transceiver protection, and surveillance/PoE line-card protection circuits. When designing with the SMCJ33A-AT, confirm that the system's maximum continuous working voltage never exceeds 33 V, and that the PCB land pattern follows the DO-214AB (SMC) recommendations. Note that for bidirectional requirements (positive and negative transients) the SMCJ33CA variant should be selected instead. This page consolidates verified distributor pricing (as of 2026-10-05), DO-214AB drop-in alternatives from multiple TVS manufacturers, and design guidance not found in any single manufacturer datasheet — enabling engineers to qualify second sources and reduce BOM risk.
SMCJ33A-AT-TR13 - 1500W 33V TVS Diode | YAGEO | DO-214AB
The YAGEO SMCJ33A-AT-TR13 is a 1500W peak-pulse-power unidirectional transient voltage suppressor (TVS) diode in an automotive-grade-qualified SMC (DO-214AB) surface-mount package. It features a 33V working standoff voltage (VWM), 36.7V minimum breakdown voltage, and a maximum clamping voltage of 53.3V at 28.2A peak pulse current (IPP). The -AT suffix denotes AEC-Q101 automotive qualification, and TR13 specifies 13-inch tape-and-reel packaging. The DO-214AB (SMC) package provides a robust footprint for high-power transient suppression in automotive and industrial environments. A TVS diode (transient voltage suppressor) is a discrete semiconductor designed to clamp voltage spikes and divert surge energy away from sensitive downstream circuitry. TVS diodes sit in the broader protection taxonomy alongside MOVs (metal-oxide varistors), Zener diodes used for clamping, and gas-discharge tubes; the TVS is differentiated by its sub-nanosecond response time and precise clamping voltage. The SMCJ series occupies the high-energy tier of TVS products, between smaller SMA-packaged parts (400W) and larger SMD packages such as SMCJ/SMDJ (1500W/3000W), serving as a key building block in the surge-protection hierarchy of power-management and circuit-protection subsystems. Key features include 1500W peak pulse power dissipation at a 10/1000µs waveform, glass-passivated die construction for stable breakdown characteristics, and a low leakage current of typically 1µA at the working voltage. The diode offers unidirectional clamping polarity (A suffix), excellent clamping capability, fast response time (typically <1 ns), and RoHS-compliant, halogen-free termination finish. The -AT variant adds automotive-grade reliability screening per AEC-Q101, making it suitable for under-the-hood and chassis electronics. Technically, the SMCJ33A-AT uses a silicon avalanche-junction structure that conducts in reverse breakdown when the applied voltage exceeds the breakdown threshold. At the 53.3V clamping voltage, the device can sink up to 28.2A for a brief pulse without failing, diverting energy that would otherwise damage downstream ICs. The peak pulse power is rated for a 10/1000µs exponential waveform per IEC 61000-4-2 and similar surge standards. Steady-state power dissipation is limited to 5W on a standard FR-4 PCB with adequate copper. Typical applications include 24V automotive load-dump protection (ISO 7637-2), CAN/LIN bus transceiver protection, industrial PLC I/O surge protection, USB and HDMI port ESD suppression on automotive infotainment, and protection of DC-DC converter input rails from inductive load transients. The wide 33V standoff is also useful in 24V industrial bus systems and battery-management protection circuits. When designing with this device, observe the derating of peak pulse power with pulse duration and temperature - the 1500W rating is at 25°C and a 10/1000µs waveform; shorter pulses and lower temperatures give higher ratings. Place the TVS as close as possible to the connector or entry point where transients enter the PCB, with wide, short traces to minimize parasitic inductance. The junction temperature should not exceed 150°C under any operating condition, including during surge events. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes for the SMCJ33A-AT-TR13 that complement the manufacturer datasheet.
SMCJ33A-E - 1500W 33V Uni-Directional TVS Diode DO-214AB | Littelfuse
The Littelfuse SMCJ33A-E is a 1500 W peak-pulse-power uni-directional transient voltage suppressor (TVS) housed in a surface-mount DO-214AB (SMC) package with standoff voltage of 33 V and 5 % tolerance. It clamps at 53.3 V typical with a peak pulse current of 28.2 A (8/20 µs), providing robust suppression of inductive transients, ESD, and lightning-induced surges on power and data lines. A transient voltage suppressor (TVS) is a clamping semiconductor device designed to protect sensitive downstream electronics by limiting overvoltage transients to a controlled clamp voltage. In the system protection hierarchy, TVS diodes sit at the first line of defense, ahead of series PTCs/fuses, and downstream of common-mode chokes. They combine sub-nanosecond response time with high peak-current handling, making them ideal for IEC 61000-4-2 ESD, IEC 61000-4-4 EFT, and IEC 61000-4-5 surge events on industrial, automotive, and telecom interfaces. Key features include a 1500 W peak pulse power rating (10/1000 µs waveform), a maximum clamping voltage of 53.3 V at 28.2 A Ipp, a minimum breakdown voltage of 36.7 V, and a maximum leakage current on the order of 1 µA at standoff. The DO-214AB (SMC) package provides a compact, low-profile surface-mount footprint with gull-wing leads that support visual solder-joint inspection, and the -E suffix designates a 13-inch tape-and-reel (TR13) packaging variant per Littelfuse ordering nomenclature. The SMCJ33A-E uses a uni-directional avalanche junction architecture; its breakdown characteristic is asymmetric, clamping positive transients only. The device is constructed with a glass-passivated die that delivers stable Vbr across temperature and long-term reliability. Its thermal performance allows operation across -55 °C to +150 °C Tj, and the SMC package's thermal resistance of approximately 30 °C/W on a standard JEDEC FR-4 board supports repetitive surge events without derating. The SM-JT550 family also meets moisture sensitivity level 1 (MSL1) per JEDEC J-STD-020, simplifying storage and board-level handling. Typical applications include 24 V industrial bus protection (RS-485, CAN, Profibus), DC power-rail transient suppression in telecom equipment, secondary protection behind telecom line drivers, USB and HDMI port protection, and automotive load-dump protection up to 35 V continuous. Designers commonly place the SMCJ33A-E on 24 V supply rails and signal lines exposed to outdoor or industrial transients. Unlike polymer PTCs or MOVs, TVS diodes offer fast, repeatable, sub-nanosecond response and tight clamp-voltage tolerance. When designing with this device, ensure the clamping voltage stays below the absolute maximum rating of downstream ICs. Place the TVS diode as close as possible to the connector entry point and use a low-inductance ground return; keep the PCB trace between the protected line and the TVS anode shorter than 5 mm. This page synthesizes pricing across major distributors, drop-in alternatives, and practical design notes not found in the bare datasheet.
SMCJ45A-E3/57T - 1500W TVS Diode, 45V Standoff, Uni-Directional | Vishay
The Vishay General Semiconductor SMCJ45A-E3/57T is a 1500 W peak-pulse-power unidirectional Transient Voltage Suppressor (TVS) housed in the surface-mount DO-214AB (SMC) package. It provides a 45 V reverse-standoff voltage, a minimum breakdown voltage of 50 V, a maximum clamping voltage of 72.7 V, and a peak-pulse current rating of 20.6 A on a 10/1000 µs waveform. The /57T suffix designates the part for Tape-and-Reel packaging (850 pcs per 7" reel). The part belongs to Vishay's TransZorb SMCJ series (SMCJ5.0A through SMCJ188CA). A Transient Voltage Suppressor (TVS) is a semiconductor protection device designed to clamp fast over-voltage transients (ESD, lightning, inductive load switching) to a safe level, thereby protecting downstream components. TVS diodes operate in the avalanche-breakdown mode when the applied voltage exceeds their breakdown voltage, shunting transient current away from the protected circuit. The TVS belongs to the broader circuit-protection category alongside varistors (MOVs), surge protectors, and PTC resettable fuses, and sits below voltage regulators and power MOSFETs in the power-management hierarchy. Key features include a glass-passivated chip junction for long-term reliability, low-profile DO-214AB (SMC) package ideal for automated placement, uni-directional polarity, built-in strain relief, low inductance, excellent clamping capability, fast response time (typically < 1 ps from 0 V to BV min), low reverse leakage at standoff, and a repetition-rate (duty cycle) of 0.05%. The series is RoHS compliant and lead-free. Technically, the 1500 W P_PPM is measured at a 10/1000 µs exponential waveform per IEC 61000-4-5 / IEEE C62.41 surge standards. The DO-214AB (SMC) package has a typical thermal resistance of approximately 50 °C/W junction-to-ambient on a standard JEDEC test board, which is important when calculating steady-state power dissipation under repetitive surges. Typical applications include DC power-line protection on 24 V industrial buses, automotive load-dump protection (with appropriate derating), telecom equipment surge protection, USB / HDMI port protection, and protection of microcontroller I/O pins in industrial PLCs. In all these use cases the 45 V standoff aligns with 24 V rails and 28 V avionics rails. For higher-voltage systems the SMCJ series includes variants up to 170 V standoff in the same footprint. Design consideration: derate peak-pulse power for non-standard pulse widths. The 1500 W rating is specified on a 10/1000 µs waveform; shorter pulses (e.g. 8/20 µs lightning surges) must use the device's pulse-power curve, and longer pulses (e.g. 10/100 ms load-dump) must use the load-dump curve with substantially lower P_PPM. Always refer to the published derating curves in the manufacturer datasheet. This page synthesizes distributor pricing, drop-in pin-equivalent alternatives, and practical surge-protection design notes not found in the manufacturer datasheet.
SP720ABTG - 14-Input 30V ESD TVS Array | Littelfuse
The Littelfuse SP720ABTG is a 14-input mixed-technology TVS diode array designed for electrostatic-discharge and over-voltage protection of sensitive external signal or bus lines. The device provides a listed 30 V rating, 1 A protection rating, 3 pF capacitance, and a 16-pin SOIC package. According to Littelfuse, each input uses two SCR/diode bipolar protection structures, while pins 1-7 and 9-15 are protected inputs and pin 8 provides the V+ or V- protection reference. A TVS diode array is a circuit-protection device that diverts transient current to a supply or ground rail while limiting voltage at a sensitive interface. The SP720 belongs to the transient-voltage-suppressor, mixed-technology, ESD-protection, and circuit-protection hierarchy. It is intended for systems in which exposed conductors or connectors can receive electrostatic discharge before reaching a protected logic, data, control, or communication circuit. The verified product data identifies 14 protection circuits in a surface-mount 16-SOIC package. Its 3 pF capacitance is particularly relevant to high-speed interfaces because parasitic capacitance can reduce signal rise time and disturb data timing. The 30 V and 1 A values characterize the protection device for design selection, but engineers should verify the complete datasheet limits, pulse conditions, and application configuration before relying on any rating. The SP720 architecture uses fast SCR structures together with diode protection paths. Littelfuse positions this family for general-purpose logic protection, data-bus protection, industrial process equipment, and systems requiring transient protection across many external lines. The array consolidates fourteen protected inputs into one package, reducing the number of discrete protection devices required when many connector pins need common ESD handling. Typical applications include industrial control interfaces, communication ports, instrumentation, data acquisition, embedded systems, and general-purpose connector protection. Protection is most effective when the protected traces are routed close to the connector, the array is connected to the appropriate supply or ground reference, and the signal integrity budget accounts for the array's capacitance. The part should not be treated as a substitute for surge-protection coordination outside the transient conditions covered by its manufacturer documentation. Designers should compare capacitance, protected-line count, voltage limits, current ratings, package dimensions, and exact pin mapping against the protected interface. For a data bus, the 3 pF capacitance must be checked against edge rate and receiver timing. For industrial equipment, the manufacturer’s IEC electromagnetic-compatibility guidance should be reviewed, while the exact applicable standard, system test level, and installation conditions remain design-specific and are not established by the supplied snippets. This page consolidates the verified manufacturer and distributor information, distinguishes the 14-input protection architecture from generic discrete TVS diodes, and provides practical selection and placement guidance. It does not infer unprovided production tolerances, temperature grades, surge endurance, or cross-manufacturer pin compatibility.
SP720ABTG-L - 14-Input ESD TVS Array | Littelfuse
The Littelfuse SP720ABTG-L is a 14-input transient-voltage-suppressor diode array for electrostatic-discharge and over-voltage protection of sensitive logic and data-bus circuits. The device is packaged in a surface-mount 16-SOIC and is identified as a lead-free/green SP720-series protection product. What is a TVS diode array? A TVS diode array is a semiconductor protection component placed between an external signal or bus line and sensitive circuitry. It diverts transient current away from the protected device while allowing normal low-voltage logic signals to pass. The SP720 family uses SCR/diode bipolar protection structures, with two structures associated with each input according to the Littelfuse datasheet. The verified product information identifies 14 available input-protection channels, surface mounting, and a 16-SOIC package. A distributor listing describes the related SP720ABTG variant as a mixed-technology TVS device with 14 circuits and a 16-SOIC package. The SP720ABTG-L ordering suffix is treated as the specified Littelfuse variant; electrical details beyond the supplied verified values are not independently expanded here. SP720 protection is appropriate for general-purpose logic protection, data buses, communication interfaces, and other exposed external lines where ESD transients can enter through connectors or cables. The array format provides centralized protection in one package, reducing the number of individual discrete protection devices required when several lines need protection. Placement close to the board entry point or connector is important because the protective device must intercept the transient before it propagates into the protected logic. Trace geometry, return paths, grounding, and the choice between the array and a discrete low-capacitance solution should be checked against the signal speed and operating requirements. This page combines the verified Littelfuse and distributor information with practical placement guidance and clearly marks unavailable specifications. Review the manufacturer datasheet and application note AN9734 before production release, especially for system-level ESD validation, signal integrity, and the exact electrical limits of the ordered suffix.