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G9SX-EX401-RT - 4NO Safety Expansion Unit | Omron | 24VDC Screw Terminal
The Omron G9SX-EX401-RT is a Flexible Safety Unit expansion module providing 4 instantaneous safety outputs plus 1 auxiliary PNP output, designed for DIN-rail mounting with screw terminals at 24 VDC supply. According to the Omron G9SX series datasheet, this expansion unit is intended to be cascaded with G9SX-AD (Advanced) or G9SX-BC (Basic) main units to extend safety I/O capacity in machine-safety control systems requiring logical AND combination of multiple safety signals. A safety relay / flexible safety unit is a category of solid-state safety controller that combines logic (logical AND of multiple safety inputs), monitoring (cross-fault detection, output monitoring), and switching (force-guided redundant outputs) into a single IEC 61508 / ISO 13849-1 compliant module. Within the broader hierarchy, it sits below a full safety PLC (like the Omron NX-SL) and above a discrete electromechanical safety relay, trading some flexibility for a much lower wiring complexity. The G9SX family targets mid-complexity safety functions where certified relay logic is acceptable but more than one or two safety zones must be combined. Key features of the G9SX-EX401-RT include: 4 normally-open instantaneous safety outputs (4NO), 1 auxiliary PNP semiconductor output for status feedback, 24 VDC nominal supply, screw terminal wiring (RT suffix), and compatibility with both instantaneous and OFF-delayed expansion units (G9SX-EX401 and G9SX-EX041-T) within the same logical AND chain. Solid-state outputs eliminate mechanical wear, supporting the high-cycle applications the G9SX family targets. The architecture relies on an internal cross-fault monitoring loop that forces redundant solid-state outputs to switch in unison, with internal self-test pulses on the outside to detect stuck-on or stuck-off failures - this is what allows the unit to be certified for use up to PLe / SIL3 in conjunction with the upstream Advanced or Basic unit. The logical AND input allows multiple expansion units to be chained while still meeting category-4 / PLe performance when properly wired. Typical applications include: (1) extending safety I/O for robotic work cells where multiple e-stops and light curtains must be logically combined, (2) emergency-stop expansion on large packaging machinery, and (3) safety door monitoring on multi-station assembly lines. The non-wearing solid-state outputs make the G9SX-EX401-RT particularly suited to high-cycle-count installations where electromechanical relays would wear out quickly. When designing with the G9SX-EX401-RT, note that the unit cannot operate standalone - it requires a G9SX-AD or G9SX-BC master unit to provide the safety logic and one safety output contact. Plan the DIN-rail layout to leave room for the upstream master and any additional expansion modules, and observe the wiring derating curves in the datasheet when outputs are stacked at full 3 A load. This page synthesizes distributor pricing, drop-in same-brand alternatives within the G9SX family, and practical design notes not found in the standalone manufacturer datasheet.
PVA1352NSPBF - 100V 375mA SPST-NO Photo-Coupled Relay | Infineon
The Infineon PVA1352NSPBF is a 100 V, 375 mA single-pole normally-open solid-state photovoltaic relay (PVR) housed in an 8-pin modified SMT package with 4 leads and a 4 kV input-to-output isolation barrier. The part is manufactured by Infineon (originally International Rectifier, now part of Infineon) and is qualified to switch analog signals up to 100 V AC/DC with a typical on-state resistance of 5 ohm. The photovoltaic relay uses a stack of photo-voltaic cells to generate an isolated gate drive for two back-to-back HEXFET power MOSFETs, providing a true SPST-NO 1 Form A contact without moving parts. A Photovoltaic Relay (PVR) is a solid-state relay that uses light from an input-side LED to charge a photovoltaic gate-driver array, which in turn drives the gates of one or more MOSFET output switches. Compared with electromechanical relays, PVRs offer unlimited dry-circuit switching, bounce-free operation, very low off-state leakage, and immunity to shock and vibration. PVRs sit in the solid-state relay hierarchy alongside photo-triac couplers and reed relays, but excel at low-level DC and AC analog switching where reed relays would otherwise be required. Key features of the PVA1352NSPBF include 1.0 ohm (typical) on-resistance, 375 mA continuous load current, 100 V maximum load voltage, 4 kV RMS I/O isolation, 5 mA typical LED trigger current, 25 mA absolute maximum LED forward current, and 125 us turn-on / 150 us turn-off typical switching times. The 8-SMD footprint (0.300 inch / 7.62 mm pitch, 4 active leads) is JEDEC-registered and pin-compatible with the broader PVA13xx family. Internally, the device stacks multiple photovoltaic cells in series so that the open-circuit voltage generated by the LED bias is sufficient to enhancement-mode the dual HEXFET output switches. Because there is no charge pump or DC-DC converter, the output is purely level-sensitive and exhibits no charge-pump-induced offset or audible noise. The bidirectional AC/DC capability comes from the two MOSFETs wired in a back-to-back source configuration, which blocks both positive and negative load voltages. Typical applications include automatic test equipment (ATE) reed-relay replacement, instrumentation multiplexing, process control analog switching, medical patient-isolation analog signal routing, and telecom line-card signal switching. The low on-resistance and high isolation also suit precision data-acquisition front-ends and low-distortion audio signal routing. When designing with this part, ensure the LED is driven with a current-limited source between 5 mA and 25 mA. The photovoltaic gate stack requires continuous LED current to remain in the on state - pulsed drive is not supported. Bypass the output with a TVS or snubber if the load is highly inductive to limit dv/dt-induced drain voltage transients. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
PVAZ172NSPBF - 60V 1A Photo-Voltaic SSR Relay | Infineon
Infineon PVAZ172NSPBF is a 60 V, 1 A single-pole normally-open solid-state photovoltaic relay (Photorelay) in an 8-pin modified SMT package, designed as a drop-in replacement for electromechanical relays used in general-purpose AC and DC switching. This optically-coupled, MOSFET-output device isolates the low-voltage control input from the load side using a built-in photovoltaic driver that generates the gate voltage for two back-to-back MOSFETs, delivering 0.5 ohm on-state resistance, 4 kVrms input-to-output isolation, and 25 mA typical forward LED drive current. A solid-state relay (SSR) is a semiconductor switching device that uses an optically-coupled or magnetically-coupled isolation barrier to control a load without moving parts. Photovoltaic relays are a subtype that generate a floating gate-drive voltage internally from the LED input, allowing direct switching of isolated DC and AC loads without an external bias supply. They sit in the broader electromechanical hierarchy of relays and are classified under Power Management and Electromechanical > Relays in distributor catalogs. Photovoltaic relays trade the long life and silent operation of MOSFET-only SSRs for higher current capability than typical phototriac SSRs. Key features of the PVAZ172NSPBF include 60 V load voltage maximum (AC or DC), 1 A continuous load current, 0.5 ohm maximum on-state resistance, 4 kVrms I/O isolation voltage, 25 mA nominal LED forward current, and SPST-NO (1 Form A) contact configuration. The 8-SMD modified package (0.300 inch, 7.62 mm body, 4 leads) simplifies PCB layout and provides high isolation in a compact footprint. At the circuit level, the device integrates an AlGaAs infrared LED optically coupled to a photovoltaic generator that drives the gates of two series MOSFETs. When the LED is biased, the photogenerated voltage exceeds the MOSFET threshold and turns the output on with no moving parts, eliminating contact bounce and arcing. Typical applications include industrial control modules, programmable logic controller (PLC) outputs, battery monitoring systems, and instrumentation multiplexers. The wide load-voltage range supports both 24 V DC industrial rails and 48 V AC telecom signal lines, while the high isolation protects low-voltage microcontrollers from transients on the field side. Design tip: provide adequate PCB creepage between the input pins (1-4) and the output pins (5-8) to preserve the rated 4 kV isolation in production boards, and add an RC snubber across inductive loads to limit dv/dt-induced false turn-on. This page synthesizes distributor pricing, drop-in alternatives in the same 8-SMD package, and practical design notes not found in the manufacturer datasheet alone.
PVDZ172NSPBF - 60V 1.5A Photovoltaic Solid-State Relay | Infineon
The Infineon PVDZ172NSPBF is a 60 V, 1.5 A DC single-pole normally-open photovoltaic solid-state relay (SSR) housed in an 8-pin modified SMT (0.300 inch / 7.62 mm gull-wing) package. The part is a HEXFET Power MOSFET output photovoltaic relay that optically couples an LED driver to a MOSFET output stack, providing bounce-free switching of DC loads up to 60 V at 1.5 A continuous current. It is lead-free (Pb-free suffix "PBF") and qualified as an SPST-NO (1 Form A) device suitable for replacing electromechanical and reed relays. A photovoltaic solid-state relay is a semiconductor switch whose input (an infrared LED) generates a photovoltaic voltage via an optically-coupled stack of photodiodes, which in turn drives the gates of one or more power MOSFETs on the output side. This topology provides galvanic isolation (typically several kV), infinite mechanical life, no contact bounce, insensitivity to shock, vibration and external magnetic fields, and silent operation. Compared with electromechanical relays, photovoltaic MOSFET SSRs switch much faster (microseconds vs. milliseconds), draw zero holding current in the output stage, and generate no EMI from contact arcing. Key features of the PVDZ172NSPBF include a 60 V maximum load voltage, 1.5 A continuous load current (DC), low on-resistance (RDS(on)) HEXFET output MOSFETs in a back-to-back or single-MOSFET configuration, optical isolation between input and output, and solid-state reliability (no moving parts, no contact wear). The modified 8-pin SMT package provides a standard 0.300-inch row spacing for drop-in PCB compatibility with traditional PCB-mount relay footprints, and the gull-wing leads simplify surface-mount assembly and inspection. The part is intended for general-purpose DC switching, including replacing electromechanical relays in industrial control, instrumentation, security, automotive and battery-powered systems. Designers choose photovoltaic SSRs when they need silent, bounce-free operation, long operational life (>10^9 cycles), resistance to shock/vibration/magnetic fields, or when they need to switch low-level signals without contaminating them with mechanical contact noise. Typical applications include: industrial control PLCs and I/O modules, battery management systems (BMS), test and measurement equipment, security and alarm systems, automotive ECU signal switching, medical instrument switching, audio equipment muting circuits, and any general-purpose DC load switching where a traditional reed or electromechanical relay would previously have been specified. The PVDZ172NSPBF is one of the lower-voltage members of Infineon's photovoltaic relay family; for higher load voltages (e.g. 100 V, 200 V, 400 V, 600 V) other members of the PVDZ family should be selected. Design consideration: ensure that the input LED is driven within its specified forward current range (typically 5-25 mA through an external current-limiting resistor); under-driving the LED will not generate sufficient photovoltaic voltage to fully enhance the output MOSFETs, leading to high RDS(on) and self-heating. Likewise, add a snubber or TVS across the output if the load is inductive (solenoid, relay coil, motor) to protect against inductive kickback that can exceed the 60 V rating. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
PVG612AS-TPBF - 60V 2A SPST-NO PhotoVoltaic Relay SMD | Infineon
The Infineon PVG612AS-TPBF is a 60 V, 2 A solid-state photovoltaic relay (PhotoRelay / MOSFET relay) in a 6-pin SMD package (0.300 inch / 7.62 mm pitch) supplied on tape-and-reel. It uses an integrated GaAlAs LED optically coupled to a photovoltaic generator that drives an Infineon (formerly International Rectifier) HEXFET power MOSFET as the output switch, giving bounce-free switching and eliminating mechanical wear. A photovoltaic relay (also called a PhotoMOS relay, MOSFET relay, or optically isolated solid-state relay) is a semiconductor device that uses light from an input LED to generate a stack of photovoltaic cell voltages, which then gate the output MOSFET. Because the output switching element is a MOSFET rather than an electromechanical contact, these relays offer essentially unlimited cycle life, microsecond switching speeds, no contact bounce, silent operation, and high immunity to shock, vibration, and magnetic fields. They sit in the broader hierarchy of solid-state relays (SSR), which themselves are a sub-category of electromechanical/optical switching components used in industrial automation, instrumentation, and battery management. Key features of the PVG612AS-TPBF include 60 V maximum load voltage, 2 A continuous load current, 0.1 ohm typical on-state resistance (RDS(on)), 4000 Vrms input-to-output isolation voltage, 25 mA typical LED forward current, and SPST-NO (1 Form A) contact configuration. The HEXFET output stage provides linear AC/DC operation and a high off-state leakage resistance, enabling the relay to replace electromechanical relays in many applications with a far longer operating life. Typical applications include automatic test equipment (ATE) multiplexing, instrumentation multiplexing, battery monitoring and management systems, audio signal switching, industrial control and process automation, and mercury-wetted-relay replacement. The 6-pin SMD package supports reflow soldering and high-density PCB designs, while the tape-and-reel format enables high-volume automated assembly. When designing with this device, observe the input-side LED forward current (typically 25 mA for reliable turn-on) and ensure adequate PCB creepage and clearance to maintain the 4000 Vrms isolation rating. The output MOSFET is suitable for both AC and DC loads; for inductive loads an external TVS or snubber is recommended to clamp transients within the 60 V rating. This page synthesizes distributor pricing, parametric drop-in alternatives (same-brand Infineon first, then cross-brand), practical design notes, and AI-citation-optimized FAQs not consolidated in any single manufacturer or distributor page.
PVG612ASPBF - 60V 2A SPST-NO Photo-Coupled Relay | Infineon
The Infineon PVG612ASPBF is a 60 V, 2 A AC / 4 A DC single-pole normally-open solid-state photovoltaic (PhotoMOS) relay housed in a 6-pin SMD package (0.300 inch / 7.62 mm pitch). It uses Infineon's HEXFET power MOSFET output stage driven by a photovoltaic isolation stack, providing bounce-free switching, 4 kV input-to-output isolation, and 0.1 ohm on-state resistance (max) in a compact surface-mount footprint. A photovoltaic relay is a semiconductor-based solid-state relay (SSR) that uses a stacked photovoltaic generator to optically couple and electrically isolate a low-power LED input from a MOSFET output stage. The category sits inside the broader SSR family (photo-coupled relay -> solid-state relay -> electromechanical replacement -> signal/power switching component) and is commonly used as a silent, mercury-free alternative to electromechanical reed or armature relays. Key differentiating features include 60 V load voltage rating, 2 A AC continuous / 4 A DC pulsed load current, typically 0.05 ohm on-resistance, 4 kV I/O isolation voltage, 25 mA nominal LED forward current, and unlimited mechanical operating life (no moving parts). The HEXFET output stage enables linear AC or DC operation and stable on-resistance versus electromechanical contacts that drift with wear. Architecturally, an AlGaAs infrared LED at the input optically drives a series-connected photovoltaic cell stack that produces the gate voltage for two back-to-back HEXFET MOSFETs at the output. This stack-based generator typically produces ~7-9 V gate bias when activated with the recommended 25 mA LED current, fully enhancing the output MOSFETs to achieve the rated 0.05-0.1 ohm Rds(on). Typical applications include isolated switching of 12-48 V AC or DC loads, battery management systems, industrial automation PLC outputs, medical equipment patient isolation, ATE (automatic test equipment) multiplexing, and instrumentation multiplexer cards where bounce-free silent switching is required. When designing, choose a current-limit resistor that delivers 10-30 mA to the input LED (typically 1.4 V Vf) and respect the maximum load voltage and surge current ratings. Unlike electromechanical relays, photovoltaic relays have a small residual on-resistance that dissipates I^2*R power and limits DC switching to the rated load current. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
PVG612PBF - 60V 1A SPST-NO Photo MOSFET Relay | Infineon
The Infineon PVG612PBF is a single-pole, normally-open (SPST-NO, 1 Form A) solid-state photovoltaic relay built around a HEXFET power MOSFET output stage, packaged in a 6-pin molded DIP (0.300 inch, 7.62 mm) through-hole format. It switches loads up to 60 V at 1 A AC or 2 A DC with a typical on-resistance of 0.5 ohm, controlled by an integrated GaAlAs LED that drives a proprietary photovoltaic generator to actuate the MOSFET gate. Isolation voltage between input and output is rated at 4 kVrms, allowing direct replacement of electromechanical relays in many industrial and instrumentation designs. A solid-state relay (SSR) is an electronic switching device that uses semiconductor devices and optoelectronic isolation to perform the same on/off function as an electromechanical relay, but with no moving parts, no contact bounce, no arcing, and effectively unlimited operational life. The PVG612 belongs to the photovoltaic-relay subclass, which uses a GaAlAs LED optically coupled to a photovoltaic micro-generator that produces the gate voltage for the output MOSFET. This removes the need for an internal DC-DC bias supply and yields extremely low off-state leakage. Within the broader taxonomy, PVG612 is part of the Infineon PVG612 family of photovoltaic relays, which sits inside the opto-isolated solid-state relay category, itself a branch of electromechanical / relay components. Photovoltaic relays are valued for silent switching, immunity to magnetic fields, microsecond switching, and stable on-resistance over temperature. Key differentiating specifications include a 60 V maximum load voltage, 1 A AC / 2 A DC load current, 0.5 ohm maximum on-resistance, 4 kVrms I/O isolation, 25 mA typical LED forward current, and an operating temperature range of -40 C to +85 C. The device is supplied as a RoHS-compliant Pb-free unit in a 6-DIP through-hole package, making it drop-in compatible with legacy PCB footprints used by conventional reed and electromechanical relays. Designers value its HEXFET output for rugged avalanche-rated switching of inductive and resistive loads in 12 V to 48 V AC or DC systems. Typical application areas include isolated switching of 12 V to 48 V industrial loads, telecom line cards and battery management multiplexing, automatic test equipment (ATE) reed-relay replacement, instrumentation multiplexing, and medical equipment isolation. Its normally-open SPST topology and 4 kV isolation also suit HVAC controls, security systems, and process control I/O modules. Designers should note that switching speed (turn-on / turn-off) is limited by the MOSFET gate capacitance and is typically in the millisecond range, considerably slower than a photo-triac SSR; for low-distortion AC mains switching, an SSR with zero-cross turn-on is preferable. The PVG612PBF also requires the LED to be driven with a current-limiting resistor at 10 mA to 25 mA. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
PVG612S-TPBF - 60V 1A SPST-NO PhotoVoltaic Relay SMD | Infineon
The Infineon PVG612S-TPBF is a 60 V, 1 A AC / 2 A DC single-pole normally-open photovoltaic solid-state relay (PhotoRelay / Photorelay) housed in a 6-pin SMD package (0.300 inch / 7.62 mm pitch). It is supplied on tape-and-reel and uses Infineon's proprietary HEXFET power MOSFET as the output switching element, driven by an integrated on-chip photovoltaic generator that is activated by a GaAlAs infrared LED on the input side. A photovoltaic relay (also called a Photorelay or solid-state photo-coupled relay) is a semiconductor alternative to an electromechanical relay. The input is an infrared LED; light from this LED strikes an array of photodiodes that generate a small gate-drive voltage, which then turns on a power MOSFET on the output side. Because the input and output are coupled only by light, the device provides galvanic isolation of several kilovolts and contains no moving parts, giving it effectively unlimited operational life and immunity to shock, vibration and external magnetic fields. Within the broader taxonomy, the PVG612S-TPBF sits in the hierarchy: solid-state relay -> photovoltaic relay -> photo-coupled relay -> relay -> electromechanical component. Key features of the PVG612S-TPBF include a maximum load voltage of 60 V, a maximum on-state resistance of 0.5 ohm, an input LED forward current of 25 mA typical, an isolation voltage of 4 kV, SPST-NO (1 Form A) contact form, and SMT-mountable 6-pin package. The HEXFET output MOSFET provides low and stable on-resistance over the operating life of the device, in contrast to electromechanical relays whose contact resistance drifts with wear. Technically, the device integrates a GaAlAs LED, a photodiode array, and a HEXFET power MOSFET in a single hermetic package. Turn-on is performed by biasing the input LED; turn-off occurs when the LED current is removed, with switching times in the millisecond range. The photovoltaic generator design eliminates the need for an external DC bias supply on the output side, simplifying PCB layout compared to typical opto-MOSFET drivers. Typical applications include instrumentation multiplexing, automatic test equipment (ATE) reed-relay replacement, medical equipment patient-isolation switches, industrial controls, and telecom line switching where long life, low contact resistance and silent bounce-free operation are required. When designing with this part, observe the derating curve for load current versus ambient temperature; sustained operation near the 1 A AC / 2 A DC limit requires careful thermal management of the SMD pads. Also note that the PVG612S-TPBF is supplied only in tape-and-reel packaging, while the PVG612SPbF is the tube-packaged version for hand-assembly prototyping. This page synthesizes distributor pricing from DigiKey and Mouser, verified pin-compatible drop-in alternatives from manufacturer cross-reference data, and practical design notes not found in the standalone datasheet, giving engineers a single source for selection, sourcing and PCB layout guidance.
PVG612SPBF - 60V 1A Photovoltaic Relay SSR | Infineon
The Infineon PVG612SPBF is a 60 V, 1 A solid-state photovoltaic relay (PVR) in a 6-pin SMD package (0.300 inch, 7.62 mm). It is built around Infineon's proprietary HEXFET power MOSFET output stage, optically driven by an integrated photovoltaic generator that replaces the primary coil of an electromechanical relay. The device is configured as SPST-NO (1 Form A), normally open, with a maximum on-resistance of 0.5 ohm, 4 kV I/O isolation, and a GaAlAs LED input. What is a photovoltaic relay? A photovoltaic relay (also called a photorelay or solid-state relay, SSR) is an optoisolated switch that uses light from an input LED to drive an embedded photovoltaic cell, which in turn biases the gate of a MOSFET output. In the system hierarchy it sits between an optocoupler (signal-level isolation) and a power MOSFET relay (high-current switching) - combining galvanic isolation with silent, bounce-free, semiconductor switching. Compared with electromechanical relays (EMRs), PVRs offer unlimited mechanical life, no contact bounce, magnetic-field immunity, and sub-millisecond switching. Key features include a 60 V maximum load voltage (AC or DC), 1 A continuous AC / 2 A DC load current, 0.5 ohm maximum on-resistance (RDS(on)), 25 mA typical forward LED current (If), and 4 kV input-to-output isolation voltage. The PVG612SPBF is part of the Pb-free (PBF) variant, supplied in tape-and-reel packaging suitable for high-volume automated assembly. Its compact 6-SMD footprint replaces larger EMR packages, simplifying PCB layout and reducing component count in dense designs. Architecturally, the PVG612SPBF uses a GaAlAs infrared LED on the primary side, optically coupled to a series-stacked photovoltaic (PV) cell array that generates the gate-drive voltage for the HEXFET output MOSFET. This two-stage approach - LED to PV cell to MOSFET gate - provides true galvanic isolation while maintaining a clean, isolated MOSFET switching characteristic with very low leakage and stable on-resistance. Typical applications include isolated low-current power switching in telecom line cards, battery management systems, industrial PLC I/O modules, programmable logic controller (PLC) outputs, and instrumentation multiplexer switching. Designers favor the PVG612SPBF for switching 12 V to 48 V AC or DC loads where silent operation and long life are required. When designing with this part, observe the 25 mA nominal LED forward current (If) and add a current-limiting resistor to limit If to safe levels. The MOSFET output requires a minimum load to maintain the off-state leakage specification - leave at least 1 to 2 mA flowing through the output to keep the part in the linear region. Always verify thermal dissipation under DC loads. This page synthesizes distributor pricing (as of 2026-09-13), drop-in replacement candidates, and engineering design notes not found in the standalone Infineon datasheet.
PVT312LS-TPBF - 250V 170mA SPST-NO Photo MOSFET Relay | Infineon
The Infineon PVT312LS-TPBF is a 250 V, 170 mA single-pole normally-open solid-state photovoltaic relay (SSR / photorelay) housed in a 6-pin SMD package (0.300 inch, 7.62 mm). It utilizes International Rectifier's HEXFET power MOSFET output stage driven by an integrated photovoltaic generator activated by a GaAlAs infrared LED, replacing electromechanical relays in many applications. Key specifications include 250 V load voltage, 170 mA AC / 300 mA DC continuous load current, 15 ohm maximum on-state resistance, and 4 kV input-to-output isolation. A photovoltaic relay (also called a photorelay, Photo-MOS relay, or solid-state relay / SSR) is an optocoupler-style device that uses light from an internal LED to generate a photovoltaic voltage that turns on a MOSFET output stage. Compared with electromechanical relays, photorelays offer silent bounce-free switching, virtually unlimited switching cycles, low drive current (typically a few mA), and high input-to-output isolation (often 3.75 kVrms to 5 kVrms). They sit in the hierarchy: photorelay -> solid-state relay -> relay -> electromechanical component, and are widely used where long life, low power coil drive, and silent switching are required. Key features include a GaAlAs LED input at 1.2 V typical forward voltage, integrated active current-limiting circuitry that withstands surge transients, 25 mA maximum forward current with 50 mA peak surge rating, and 5 mA typical LED turn-off current. The output HEXFET MOSFET provides bidirectional AC/DC switching capability, while the integrated photovoltaic driver eliminates the need for an external bias supply on the output side. Typical applications include telecom line switching, instrumentation multiplexing, programmable logic controller (PLC) output modules, automatic test equipment (ATE), medical equipment patient isolation, and battery management isolation. The wide 0-250 V load range and SPST-NO (1 Form A) contact form suit both AC and DC loads. A key design consideration is thermal management: although the SSR has low drive current, the on-state resistance (15 ohm max) produces I-squared-R dissipation, and the small SMD footprint has limited thermal headroom. Ensure PCB copper pours are adequate and that the LED drive circuit respects the minimum turn-on current (typically 2-5 mA) to guarantee reliable operation. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
PVT312LSPBF - 250V SPST-NO Photovoltaic SSR | Infineon
The Infineon PVT312LSPBF is a single-pole, normally-open solid-state photovoltaic relay (SSR) rated for 250 V AC/DC load switching, with 190 mA AC / 320 mA DC continuous load current, and housed in a 6-pin SMD DIP-style package (0.300 inch / 7.62 mm pitch). It uses Infineon's proprietary HEXFET power MOSFET as the output switch, driven by an integrated photovoltaic generator that converts DC control input into isolated gate-drive voltage, eliminating the need for an external bias supply on the load side. A solid-state relay (SSR) is an electronic switching device that uses semiconductor output stages (typically back-to-back MOSFETs or triacs) instead of moving mechanical contacts, providing galvanic isolation between control and load circuits. Compared to electromechanical relays, SSRs offer silent operation, no contact bounce, faster switching speeds, and unlimited mechanical endurance. The photovoltaic subtype adds true optical-isolation-level isolation by using stacked photocells to generate the gate drive, removing the auxiliary supply rail required by many other SSR topologies. Key features of the PVT312LSPBF include 250 V continuous blocking voltage, 0.5 ohm on-resistance (max) at 25 C, 5 mA typical input control current to turn on, 0.25 mA (max) input current to turn off, 2 ms turn-on time and 0.25 ms turn-off time, and 3750 Vrms input-to-output isolation. The device provides arc-free switching with no snubber required for typical loads, and a guaranteed linear AC/DC operation from DC to several kHz. The HEXFET output is bidirectional (two MOSFETs in source-to-source configuration), enabling both AC and DC load switching with a single part number. The PVT312LSPBF is specifically designed for telecom switching applications (line-card hookswitches, ringing injection, test access) but its specifications also suit instrumentation, ATE multiplexing, process control, medical equipment patient isolation, and industrial automation. In practice it replaces electromechanical relays where silent, bounce-free, long-life switching is required and where the load current stays below ~190 mA continuous. When designing with this part, derate the load current with temperature - the HEXFET output resistance rises with junction temperature, and the part has no thermal shutdown. A series resistor on the LED input (typically 470-1000 ohm at 5 V logic) sets the LED forward current; do not exceed 25 mA. The 250 V rating is the continuous blocking voltage - add margin for transients or use an external MOV for inductive loads. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes for the PVT312LSPBF not consolidated in the manufacturer datasheet.
PVT312S-TPBF - 250V 190mA SPST-NO Photo Voltaic Relay | Infineon
The Infineon PVT312S-TPBF is a single-pole, normally open (SPST-NO / 1 Form A) solid-state photo-coupled relay (Photorelay) rated for 250 V load voltage and 190 mA AC / 320 mA DC continuous load current, housed in a 6-pin SMD (PDIP SMT, 0.300" / 7.62 mm) package and supplied on Tape & Reel. Key electrical parameters include 25 mA maximum DC input (LED) forward current, a typical on-state resistance of 10 ohm maximum, and an isolation voltage of 4 kV between input and output. The device utilizes International Rectifier HEXFET power MOSFET output switches driven by an on-board photovoltaic micro-power IC, eliminating the need for an external DC bias supply. A photovoltaic relay (Photorelay) is a solid-state relay that switches AC or DC loads using light energy generated by an integrated photodiode array. When LED current flows through the input optocoupler, the photodiodes generate a voltage that gates two back-to-back MOSFETs in the output stage, providing galvanically-isolated, zero-crossing-free switching. This topology replaces electromechanical relays where long life, silent switching, and high isolation are required, sitting in the hierarchy: Photorelay -> solid-state relay -> semiconductor relay -> electromechanical substitute. PVT312S-TPBF features a 5 mA typical LED trigger current, 5 ms turn-on time, 0.5 ms turn-off time, and an operating temperature range of -40 C to +85 C. The 4 kV input-to-output isolation exceeds the requirements of IEC 60747-5-2 for reinforced insulation optocouplers, while the hermetically-equivalent molded SMD package provides stable thermal performance for automated pick-and-place assembly. Typical applications include telecommunications line switching, instrumentation multiplexers, automatic test equipment (ATE) reed-relay replacement, battery management isolation in industrial systems, and medical equipment patient-isolation switching. The 250 V / 190 mA rating covers most low-power AC and DC load switching up to 47 VA. When designing with this part, ensure the input LED is driven with a current-limited source (typically 5-10 mA through a series resistor from a 5 V or 3.3 V logic rail) and respect the maximum load current derating above 40 C ambient. Because the output MOSFETs are enhancement-mode, the relay is fail-open by design - a useful safety property for alarm circuits.
PVT312SPBF - 250V 190mA 1-Form-A PV Relay 6-SMD | Infineon
The Infineon PVT312SPBF is a single-pole, normally-open (1 Form A) solid-state photovoltaic (PV) relay housed in a 6-pin SMD package (0.300", 7.62 mm). It is rated for 250 V load voltage and 190 mA AC / 320 mA DC continuous load current, with a maximum on-state resistance of 10 ohm and an input-to-output isolation voltage of 4 kV. The device is specifically designed as a drop-in replacement for electromechanical relays in telecom and instrumentation switching applications where long life, silent operation, and bounce-free switching are required. A photovoltaic (PV) relay is a solid-state relay whose output switch is driven by a photogenerated voltage produced by an array of monolithically-integrated photodiodes illuminated by an input LED. Because the output side is purely optical-electrical, there are no moving contacts, no contact bounce, no arc, and no acoustic noise. The PVT312 belongs to the SSR (solid-state relay) family, which sits in the broader relay hierarchy: relay > solid-state relay > photovoltaic relay > optocoupler-isolated load switch. Its two MOSFET output switches stacked in series create a bidirectional AC/DC capable switch with extremely low leakage. Key differentiating features include a typical LED forward current (If) of 25 mA, an SPST-NO contact configuration, surface-mount terminals, and lead-free / Pb-free construction (the "PbF" suffix). Because the output uses two back-to-back MOSFETs there is no inherent current limit at turn-on, so designers must respect inrush limits. The 6-SMD gull-wing footprint allows standard SOIC-6-compatible PCB placement. Typical applications include telecom line switching, automatic test equipment (ATE) relay matrices, battery management isolation, instrumentation multiplexer cards, and industrial PLC discrete I/O. The combination of 4 kV isolation and silent switching makes the part attractive for medical and audio equipment where electromechanical relays inject audible click noise. When designing with this device, observe the maximum load ratings carefully: the 190 mA AC and 320 mA DC figures apply to different load polarities. Provide adequate heatsinking via PCB copper for currents above 100 mA. Reverse the LED polarity safely: the input has standard polarity orientation. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
PVT322PBF - 250V 170mA Dual Photovoltaic Relay DIP-8 | Infineon
The Infineon PVT322PBF is a dual-pole, normally open solid-state photovoltaic relay rated at 250V and 170mA AC/DC, housed in an 8-pin DIP (0.300 inch / 7.62mm) through-hole package. It utilizes International Rectifier's HEXFET power MOSFET as the output switch, driven by an integrated circuit photovoltaic generator activated by a GaAlAs infrared LED on the input side. The PbF suffix indicates lead-free, RoHS-compliant packaging. A photovoltaic relay (PVR) is a solid-state relay variant that uses optically-coupled photovoltaic cells instead of secondary-side bias supplies to generate the gate drive voltage for the MOSFET output. This topology sits within the broader optocoupler / solid-state relay taxonomy, which itself branches from electromechanical relays, semiconductor relays, and isolated switch ICs. PVRs eliminate the need for an external DC bias on the output side, making them well-suited for high-side or floating-switch applications where maintaining isolation between the low-voltage control domain and a high-voltage load is mandatory. Key features include 250V continuous load voltage (250V AC peak or DC), 170mA on-state load current per channel, 5kV input-to-output isolation, bounce-free MOSFET switching, and zero-offset turn-on behavior. The HEXFET output stage provides low on-resistance of 8 ohms typical per channel, reducing steady-state conduction losses versus small-signal MOSFET SSR alternatives. The dual 1-Form-A contact configuration allows independent control of two separate loads, or series/parallel wiring for higher voltage or current. The architecture uses a GaAlAs infrared LED optically coupled to a monolithic photovoltaic cell array that produces approximately 6V open-circuit voltage under proper LED bias. This generated voltage directly drives the gate of the HEXFET output MOSFET, eliminating auxiliary bias supplies while maintaining >5000Vrms isolation between input and output per IEC 60747-5-2 phototransistor isolator guidelines referenced in the datasheet. Typical applications include instrumentation multiplexing, automatic test equipment (ATE) reed-relay replacement, telecom line switching, industrial process control, programmable logic controller (PLC) outputs, and medical equipment isolation switching. The bounce-free operation is especially valuable in data-acquisition front-ends and audio signal routing where electromechanical relay contact bounce introduces measurement error. When designing with this part, observe the minimum LED forward current (typically 5mA for guaranteed turn-on) and derate load current with ambient temperature above 40C. Two independent channels share the same DIP-8 footprint, enabling drop-in upgrade from single-channel PVG-series solid-state relays while doubling switch density on the same PCB area. This page synthesizes distributor inventory, drop-in alternatives, and practical design notes not found in the standalone manufacturer datasheet, providing engineers with consolidated decision data for relay selection.
PVT322SPBF - Dual 250V/170mA PhotoVoltaic Relay 8-SMD | Infineon
The Infineon PVT322SPBF is a dual-pole normally-open solid-state photo-coupled relay (PhotoRelay / photovoltaic relay) rated for 0-250V AC/DC load voltage and 170 mA continuous load current per pole, housed in an 8-pin SMD package (0.300", 7.62 mm). It integrates two independent Form A (SPST-NO) photovoltaic switches driven by a GaAlAs infrared LED input stage, providing galvanic isolation between the low-voltage control side and the high-voltage output switches. A photovoltaic relay is an optically-isolated, MOSFET-output semiconductor relay that replaces electromechanical relays in many applications. Unlike reed or armature relays, it contains no moving parts, so it offers unlimited mechanical life, bounce-free switching, and silent operation. The photovoltaic relay belongs to the broader solid-state relay (SSR) family, which sits within the electromechanical-and-power switching category and bridges low-power logic signals to medium-power AC or DC loads. Key features of the PVT322SPBF include 250 V blocking voltage per pole, 170 mA continuous load current, typically 4 kV input-to-output isolation, and low on-resistance that minimizes conduction losses. Because the output is a photovoltaic-driven MOSFET stack, on-resistance scales with blocking voltage and is higher than that of a discrete power MOSFET. The device requires no external supply on the switch side - the LED's optical energy directly generates the gate-drive voltage that turns the MOSFETs on. The PVT322SPBF is built around Infineon's HEXFET-class photovoltaic switch architecture with two independent isolated channels, each containing a series MOSFET stack for high blocking voltage. The input stage uses an infrared LED that, when forward-biased, generates the micro-watts of photovoltaic voltage required to bias the MOSFET gates above their threshold. Turn-on time is typically in the millisecond range and there is no arc, bounce, or acoustic noise at switchover. Typical applications include instrumentation multiplexing, automatic test equipment (ATE) matrix switching, industrial process control I/O, telecom line switching, programmable logic controller (PLC) output modules, and medical equipment isolation. The dual-pole Form A configuration allows the part to replace two single-pole relays in a single footprint, simplifying PCB layout. When designing with this part, ensure the input LED is biased with adequate forward current (typically 5-10 mA through a current-limit resistor) to guarantee full turn-on of the MOSFET output. Designers must also derate load current at elevated ambient temperatures and observe the maximum blocking voltage with adequate margin for inductive or transient loads. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, providing engineers with a single reference for sourcing, replacement, and application guidance.
SR-MT9041A-2R - Matter over Thread + Zigbee Dual-Tech 2CH Smart Relay | Sunricher
The Sunricher SR-MT9041A-2R is a Matter over Thread + Zigbee 3.0 dual-protocol 2-channel in-wall smart relay module designed to retrofit standard wall boxes with two independently controllable switch channels, rated for 100-240 VAC and up to 5 A per channel (resistive or LED loads, 4.3 A capacitive/inductive as documented). The compact 42 x 38 x 16 mm plastic-housed module communicates natively with Apple Home, Amazon Alexa, Google Home, and SmartThings via Matter, and falls back to Zigbee 3.0 for legacy hubs, with per-channel ON/OFF control plus built-in active energy metering and overload/overheat protection. A smart relay is a wireless, app-controllable switching module installed behind a conventional wall switch that converts a traditional lighting or outlet circuit into a remotely controllable load; it sits within the broader category hierarchy of smart home modules -> in-wall relay modules -> wireless load controllers -> home automation. SR-MT9041A-2R specifically targets Matter-Thread ecosystems while preserving Zigbee interoperability during user transitions between protocols. Key features include dual independent channels, integrated energy metering reporting active power and accumulated kWh, software-overcurrent and over-temperature cutoff, push-button local control in parallel with cloud/voice/app control, and a working temperature window suitable for indoor flush-mount boxes. The dual-protocol radio allows Touchlink commissioning to a Zigbee remote and QR-code Matter pairing with any Matter-certified border router. Technically, the module runs on AC mains directly (100-240 VAC, 50/60 Hz) and exposes a low-voltage MCU plus a dual-radio SoC; it uses a triac/relay hybrid output stage rated for resistive, capacitive, and inductive loads. The Zigbee side operates as a Router or End-Device per commissioning, and the Thread side joins an existing Thread mesh via Matter over Thread. Energy metering uses a shunt/transformer front-end with calibration stored in non-volatile memory. Typical applications include retrofit dual-gang smart lighting control (2 independent lamp circuits), smart outlet/fan control in residential and hospitality settings, energy-monitoring smart switches for whole-home dashboards, and Matter/Thread mesh expansion via the device's router role (where supported). Sunricher documents the unit as fitting behind standard EU/UK/US flush boxes. When designing with this module, observe local electrical codes: ensure the input supply is properly disconnected before wiring, verify the box depth accommodates the 16 mm module thickness plus wiring bend radius, and confirm load totals do not exceed 5 A per channel (or the lower 4.3 A figure for capacitive/inductive loads). Pairing mode activation and Touchlink behavior are documented in the user manual. This page synthesizes distributor pricing, verified drop-in alternatives within the Sunricher SR family, and practical design notes not found in the manufacturer datasheet.
SR-MT9041A-R - Matter over Thread + ZigBee 1CH Smart Relay | Sunricher
The Sunricher SR-MT9041A-R is a Matter over Thread + ZigBee Dual Tech in-wall smart relay module designed for ON/OFF control of connected lighting and electrical loads, housed in a compact plastic enclosure sized for standard EU-style wall boxes. It supports one channel of output with a maximum load current of 4.3 A for resistive loads and 1.7 A for capacitive or inductive loads, while operating from a universal 100-240 Vac input and providing a switched 100-240 Vac output to the load. A Matter over Thread + ZigBee Dual Tech Smart Relay Module is a wireless, behind-the-switch actuator that combines a low-power IEEE 802.15.4 radio (Thread) with a ZigBee 3.0 stack so the same in-wall module can join either a Matter fabric or a legacy ZigBee network. These dual-protocol modules sit in the smart-home device hierarchy between a basic ZigBee relay and a pure Matter device, and they belong to the broader category of in-wall smart switches and lighting controllers used for retrofit and new-build residential automation. Key features of the SR-MT9041A-R include 100-240 Vac universal input, switched 100-240 Vac output, 4.3 A resistive / 1.7 A capacitive-inductive load rating, 3 W standby power consumption, screw-terminal input and output wiring, integrated active power and energy metering, overload and overheat protection, and Touchlink commissioning plus ZigBee Green Power kinetic-switch support. App control is delivered through Matter-certified ecosystems such as Apple Home, Amazon Alexa, and Google Home, and the module supports both remote app control and local push-button control from a traditional wall switch. From an architectural standpoint, the dual-protocol radio design uses shared 2.4 GHz IEEE 802.15.4 silicon running concurrent Thread and ZigBee 3.0 protocol stacks, with onboard firmware selecting the active commissioning path during provisioning. The internal switching element is a bistable or latching relay suitable for 100-240 Vac mains, and the metering chain is a shunt-plus-SoC ADC that reports active power and cumulative energy back to the gateway for energy-monitoring dashboards. Typical applications include retrofit ON/OFF control of ceiling luminaires, wall sconces, exhaust fans, and smart outlets in residential and hospitality installations. Because the module fits behind a conventional wall switch and is rated for the European 100-240 Vac mains, it is well suited to whole-home Matter deployments where consumers want app, voice, and physical-switch control of the same load without rewiring. When designing with the SR-MT9041A-R, confirm that the connected load stays within the 4.3 A resistive or 1.7 A capacitive/inductive derating curve and that the wall box provides adequate volume for the module's 0.1 kg plastic housing and heat dissipation at full load. This page synthesizes Sunricher manual data, distributor pricing, and protocol-level drop-in alternatives not collated in any single manufacturer datasheet.
SR-MT9101SAC-HP-SWITCH-B - 16A Matter over Thread Smart Relay | Sunricher
The Sunricher SR-MT9101SAC-HP-SWITCH-B is a 16 A Matter-over-Thread in-wall smart relay module with dual Matter + ZigBee 3.0 radio support, designed for high-load on/off switching of lighting and appliances in residential and light-commercial smart-home installations. The module accepts 100-240 VAC mains input and provides a 16 A maximum switched output (3680 W incandescent, 1220 W LED per channel) in a compact in-wall form factor intended to fit behind a standard wall box. An in-wall smart relay (also called a smart switch module or in-line relay) is a wireless-controlled switching device installed inside a wall outlet or junction box to provide remote on/off control of a connected load. Smart relays sit at the appliance/lighting tier of the home-automation hierarchy (load -> smart relay -> wireless protocol -> border router -> cloud/ecosystem -> user app/voice assistant). Unlike Wi-Fi smart plugs, Thread-based relays use a low-power IEEE 802.15.4 mesh that requires a Thread Border Router (for example, Apple HomePod mini, Google Nest Hub, or Amazon Echo with Thread support) to communicate with the home Wi-Fi and the user's preferred Matter ecosystem. Key features include 16 A relay contact rating, 100-240 VAC universal mains input, Matter-over-Thread primary radio, plus a ZigBee 3.0 fallback radio for dual-protocol operation. The module requires a neutral wire (N) for powering its radio and control circuitry, and pairs by scanning a Matter QR code printed on the device. Once commissioned, the relay can be exposed to Apple Home, Amazon Alexa, Google Home, and SmartThings simultaneously through standard Matter multi-admin capability, and can additionally be controlled by ZigBee coordinators thanks to the dual radio. The device integrates a 16 A latching or non-latching mechanical relay with zero-cross switching for reduced inrush stress, an AC-DC converter for internal power, and a multi-protocol SoC running both a Matter (Thread) stack and a ZigBee 3.0 stack on the same module. The on-board firmware supports OTA updates via Thread and ZigBee, allowing manufacturers and integrators to push compatibility fixes. A small status LED reports pairing state and current load condition during commissioning. Typical applications include retrofitting smart on/off control into existing wall switch boxes for ceiling lights, fans, and AC outlets, and building energy-management systems where a compact 16 A relay with both Matter and ZigBee support is required. Because the module is rated for high inrush loads (up to 3680 W incandescent / 1220 W LED), it is well suited to both resistive lighting and motor loads. When designing with this device, ensure the wall box has sufficient depth for the module body, provide a reliable neutral connection, and verify that the installation site has adequate Thread mesh coverage or a nearby ZigBee coordinator for commissioning. This product page synthesises distributor pricing, drop-in alternatives, and practical design notes from manufacturer documentation and integrator references.
TS117STR - 350V 120mA 1-Form-A Telecom Relay | IXYS
The IXYS Integrated Circuits Division TS117STR is a 350 V, 120 mA, 35 ohm 1-Form-A solid-state relay integrated with an optocoupler in a single 8-pin SMD package, classified under IXYS's OptoMOS multifunction telecom switch family. It provides high sensitivity with low drive power requirements that are TTL/CMOS compatible, making it an ideal solution for many telecom interface applications. The TS117STR combines optically-isolated discrete component functions in one small surface-mount package, replacing multiple discrete parts on telecom line cards, ring-detection circuits, and hook-switches. An OptoMOS solid-state relay is a semiconductor device that replaces an electromechanical relay by using an LED input optically coupled to a MOSFET output stage. The SSRs occupy the broader category hierarchy of solid-state relays -> relays -> electromechanical switches -> discrete switches -> electronic components. The TS117STR family integrates the input-side optical isolation and the output-side switching MOSFET inside one IC, eliminating the need for a separate optocoupler plus discrete MOSFET pair that designers would otherwise have to qualify for surge, isolation, and creepage/clearance separately. This consolidation simplifies BOM management and shortens PCB layout review cycles. Key features include a 350 V peak load voltage rating, 120 mA continuous load current handling, a low 35 ohm on-resistance (RON), and an integrated optically-coupled input that delivers typical 3750 Vrms of galvanic isolation between the input control side and the switched load side. The device operates across -40 C to +85 C, includes zero-voltage-crossing turn-on characteristics to minimize EMI, and is supplied in a small 8-pin SMD gull-wing package suitable for tape-and-reel assembly lines. A current-limiting version is also offered in the same family (TS117STR-L suffix). Typical applications include telephone line interface cards, ring-signal switching, line-test access, on-hook/off-hook switching, line-fault isolation, fax and modem line cards, and T1/E1 interface protection. The integrated optocoupler plus SSR replaces two PCBs' worth of discrete components in traditional telecom designs. When designing with the TS117STR, ensure sufficient creepage distance around the 8-pin SMD land pattern to maintain the rated isolation voltage, and place a TVS diode across the output to clamp inductive ring or test-pulse transients to within the 350 V maximum load voltage rating.
VO14642AABTR - 2A 60V SPST-NO Solid State Relay | Vishay
The Vishay VO14642AABTR is a high-speed single-channel normally-open solid-state relay (SPST-NO, 1 Form A) housed in a 6-pin SMD DIP package (0.300 inch, 7.62 mm). It is constructed as a multi-chip hybrid device that combines a high-efficiency infrared LED on the input side with high-performance MOSFET switches on the output side, delivering a maximum load current of 2 A and a maximum load voltage of 60 V in AC/DC or DC-only configurations. The relay features typical on/off switching times below 800 microseconds and a maximum on-resistance RON of 0.25 ohm, enabling clean bounce-free switching. A solid-state relay (SSR) is an electronic switching device that uses semiconductor output elements (typically MOSFETs, IGBTs, or thyristors) instead of mechanical contacts to switch load circuits. SSRs belong to the broader hierarchy: optoisolator -> solid-state relay -> electromechanical relay -> switching component. The VO14642AABTR integrates an optical isolation barrier rated at 5300 VRMS, providing galvanic isolation between the low-voltage control logic and the high-voltage load. Compared with electromechanical relays, SSRs offer silent operation, no contact bounce, faster switching, and immunity to mechanical wear, at the cost of higher on-resistance and the need for thermal management. Key features include a low-input forward current enabled by an efficient infrared LED, TTL/CMOS-compatible input logic, pure tin lead-free plating, and tape-and-reel packaging for high-volume SMD assembly. The DIP-6 footprint (also described as SMD-6 or 6-pin PDIP SMD) is a familiar, easy-to-place form factor that simplifies PCB layout. The VO14642AABTR supports operating temperatures up to +85 C and is RoHS compliant. A high input-to-output isolation voltage of 5300 VRMS makes it suitable for safety-critical systems requiring reinforced isolation. Typical applications include industrial automation I/O modules, programmable logic controller (PLC) output cards, battery management systems, solenoid and actuator drivers, medical equipment signal switching, and instrumentation multiplexing. The bounce-free switching characteristic is particularly valuable in measurement systems that are sensitive to mechanical contact transients. When designing with the VO14642AABTR, pay attention to the thermal path: even with a low RON of 0.25 ohm, a 2 A load dissipates approximately 1 W in the output MOSFET. Provide adequate copper area on the PCB to keep the junction temperature within safe limits. A reverse-polarity protection diode across the load is recommended for inductive loads such as solenoids or relays. This page combines distributor pricing, drop-in alternative candidates, and application design notes drawn from the manufacturer datasheet and verified distributor listings as of 2026-10-05.
VOR1142M4 - 400V SPST-NO Solid-State Relay | Vishay
The Vishay VOR1142M4 is a 400 V SPST-NO (1 Form A) solid-state photo-coupled relay (Photorelay) housed in a 4-pin SOP package measuring 4.57 mm (0.180 inch) wide. It uses a GaAlAs infrared LED on the input side and dual MOSFETs on the output side, providing galvanic isolation between low-voltage control logic and high-voltage load switching. What is a solid-state relay (SSR)? A solid-state relay is an electronic switching device that performs the same function as an electromechanical relay but contains no moving parts. SSR technology replaces mechanical contacts and armatures with semiconductor switches (typically MOSFETs, IGBTs, or thyristors) and provides galvanic isolation between input and output through an optocoupler (LED + photodetector), transformer, or RF coupler. Compared with electromechanical relays, SSRs offer silent operation, unlimited mechanical endurance, faster switching speeds, bounce-free outputs, and high resistance to shock and vibration. The VOR1142M4 belongs to the photorelay sub-family, in which an IRED drives MOSFET output switches directly through optical coupling. Key specifications include a maximum load voltage of 400 V, a typical on-state resistance of 19 ohm, a continuous load current rating of 140 mA, current-limit protection, an isolation test voltage of 3750 Vrms, and a high-reliability construction. The 4-SOP package footprint is industry-standard for miniature photorelays, enabling direct substitution on existing PCB layouts. Typical on-resistance variation with temperature is also low, allowing stable operation across the -40 C to +85 C industrial temperature range. In the output stage, the dual-MOSFET architecture provides bidirectional AC/DC switching capability through two MOSFETs connected back-to-back, supporting both polar and AC-load applications. The GaAlAs IRED provides high radiant intensity at low forward current (typically 5 mA), enabling low-power microcontroller-driven control with a guaranteed CTR/IFT specification across temperature. Typical applications include general telecom switching, security equipment, metering systems, automatic test equipment, battery monitoring, and industrial control isolation. Designers select photorelays in place of mechanical relays when silent switching, long-term reliability, low power consumption, and immunity to shock/vibration are required. When designing with this device, ensure that the load current does not exceed the 140 mA continuous rating and that the peak load voltage remains below 400 V. Always include a snubber or flyback protection when switching inductive loads, and add an input-side resistor to limit the IRED forward current to the recommended maximum (10 mA) for long-term reliability. This page synthesizes distributor pricing, cross-reference alternatives, and practical design considerations not found in the manufacturer datasheet alone, giving engineers a single reference for sourcing and second-sourcing the VOR1142M4.