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ACPL-P340-560E - 1A IGBT Gate Drive Optocoupler | Broadcom
The Broadcom ACPL-P340-560E is a 1.0 A output current IGBT gate drive optocoupler with rail-to-rail output voltage, housed in a 6-pin stretched SO (Stretched SO6) surface-mount package. It features 3750 Vrms input-to-output isolation and is qualified to IEC/EN/DIN EN 60747-5-5 safety standard, delivering up to 1 A peak output current to switch IGBTs rated up to 50 A and 1200 V in motor-control inverter stages. A gate drive optocoupler is a type of optoelectronic isolator that combines an LED input with a high-current CMOS/BCDMOS output stage to provide galvanic isolation between low-voltage control circuitry and high-voltage power switches such as IGBTs and power MOSFETs. The gate drive optocoupler sits hierarchically under optocoupler -> isolator -> semiconductor, providing reinforced isolation that protects logic-level microcontrollers and gate-driver controllers from the high dV/dt transients and high DC bus voltages typical of motor drives, solar inverters, and industrial power conversion equipment. Key features include rail-to-rail output voltage swing (VCC to VEE), 1.0 A minimum peak output current, 200 ns maximum propagation delay, and 50 ns maximum pulse-width distortion. Based on Broadcom BCDMOS process technology, the device delivers approximately twice the speed of previous-generation gate drive optocouplers, while consuming only 3.5 mA typical supply current and supporting a wide 15 V to 30 V supply range that directly drives the gate-emitter capacitance of standard 600 V/1200 V class IGBT modules. Typical applications include motor control inverter gate drives for industrial servo drives and variable-frequency drives (VFDs), solar photovoltaic (PV) inverter power stages, induction-heating resonant converters, and uninterruptible power supply (UPS) systems. The 50 kV/µs common-mode transient immunity (CMTI) ensures reliable switching in noisy high-side bootstrap configurations where IGBTs switch at 10-20 kHz with 600-1200 V DC bus rails. When designing with this device, place a 0.1 µF bypass capacitor directly across VCC and VEE pins, use a minimum 1 µF bulk capacitor at the gate of the driven IGBT, and verify creepage/clearance distances satisfy end-equipment IEC 61800-5-1 reinforced insulation at the working voltage. The ACPL-P340-560E is the tape-and-reel, IEC/EN/DIN EN 60747-5-5 approved version of the family; choose ACPL-P340-000E for tube packaging without IEC approval. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, giving engineers the cross-reference and PCB-layout data needed to evaluate and substitute the ACPL-P340-560E in IGBT gate-drive circuits.
BRT23-F - 800V Zero-Cross Phototriac Optocoupler | Vishay DIP-6
The Vishay BRT23-F is a zero-crossing phototriac optocoupler integrating a GaAs IRLED input with two electrically insulated lateral power ICs that combine a thyrister system, photodetector and zero-voltage noise suppression at the output. Housed in a 6-pin DIP package, it provides 5300 Vrms input-to-output isolation and blocks 800 V repetitive peak off-state voltages, making it a microcontroller-friendly interface to 120 VAC, 240 VAC and 380 VAC mains. A phototriac optocoupler (also called a triac-output optoisolator) is a galvanically isolated solid-state relay that uses an internal infrared LED to fire an integrated triac on the AC secondary side. It sits in the hierarchy: optocoupler > phototriac > solid-state relay > power semiconductor. The zero-crossing detector ensures the output triac only triggers when the AC line voltage is within a few volts of zero, eliminating the inrush current and RFI that random-fire optotriacs inject into resistive loads at switch-on. Key specifications of the BRT23-F include a maximum LED trigger current IFT of 5 mA (typically 1.2 mA), repetitive peak off-state voltage VDRM of 800 V, RMS on-state current IT(RMS) up to 100 mA, and an isolation voltage VISO of 5300 Vrms. The integrated zero-crossing detector suppresses dv/dt triggering up to 10 kV/µs minimum, far above what a discrete optotriac can withstand on a noisy 240 VAC line. The DIP-6 footprint occupies 7.62 mm x 6.86 mm of PCB area. Internally the device uses Vishay's monolithic BRT duals-gate thyristor process, which integrates the zero-cross comparator, photo-sense amplifier and main triac on a single dielectrically isolated die. This monolithic approach is more reliable and EMI-immune than the legacy discrete-transistor zero-cross designs found in older MOC30xx equivalents. Typical applications include solid-state relay front ends, microcontroller interfaces to 24-380 VAC loads, programmable logic controller (PLC) outputs, motor control logic isolation, solenoid drivers and AC power-line switching for industrial controls. The zero-cross feature makes it especially well suited to resistive loads such as heater elements and incandescent lamps, where inrush at random phase angles would otherwise drastically shorten filament life. When designing with this part, place a 100 Ω to 330 Ω resistor in series with the input LED to limit continuous current, and add a snubber (typically 100 Ω + 0.01 µF) across the output triac when driving inductive loads. The input LED reverse voltage rating of 6 V must be respected by the driving GPIO. This page consolidates Vishay BRT23-F distributor pricing, pin-compatible BRT21/BRT22 family variants, cross-brand drop-in alternatives, and practical design notes that the bare datasheet PDF does not surface.
FOD8314TR2V - 1.0A Gate Drive Optocoupler, 6-SOP | onsemi
The onsemi FOD8314TR2V is a 1.0 A output current gate drive optocoupler housed in a stretched-body 6-pin SOIC (SOP-6) package, designed for fast switching of IGBTs and MOSFETs in medium-power inverter systems. It combines a high-speed AlGaAs LED on the input side with an integrated gate-drive output stage that delivers 1.0 A peak output current and supports an isolation voltage of 5000 Vrms. The stretched-body geometry achieves the 8 mm creepage and clearance distances required by many reinforced-insulation safety standards, while the optimized geometry variant (FOD8314) targets tighter layouts. An optocoupler (also called an opto-isolator or photocoupler) is a semiconductor device that transmits electrical signals between two isolated circuits using light. Gate-drive optocouplers are a specialized class that integrate a high-current output stage capable of charging and discharging the gate capacitance of power transistors. Within the broader taxonomy, gate-drive optocouplers sit between standard logic optocouplers and digital isolators: they provide reinforced galvanic isolation (necessary for high-voltage safety), fast propagation delay, and high peak output current - all critical for driving power semiconductors in motor drives, solar inverters, and industrial power supplies. Key features include 1.0 A peak output current, 5000 Vrms isolation voltage, a wide operating supply range on the output side, under-voltage lockout (UVLO) for safe IGBT operation, and high common-mode transient immunity (CMTI) typically exceeding 20 kV/s. The stretched SO6 footprint offers 8 mm creepage/clearance, which is important for 600 V and 1200 V power stages where PCB contamination or humidity can degrade standard SO-6 footprints over time. The integrated UVLO prevents the gate driver from operating the IGBT in its partially-on linear region, which would otherwise cause excessive switching losses and thermal runaway. The FOD8314 uses onsemi's proprietary LED + CMOS/DMOS output architecture. The input LED is an AlGaAs type optimized for high-speed modulation and long lifetime; the output side uses a high-voltage driver stage capable of sourcing and sinking peak gate currents of 1.0 A. Typical propagation delay is in the 200-500 ns range, depending on supply voltage and load, which is well within the requirements for IGBT modules switching at up to 20 kHz. The device is qualified for industrial and motor-control environments where reinforced isolation, high CMTI, and reliable gate drive strength are mandatory. Typical applications include motor-control inverters (driving IGBT modules in 3-phase bridges), solar power inverters, industrial servo drives, and induction-heating power stages. The combination of 8 mm creepage and high output current makes it well suited to drive 600 V/1200 V class IGBT modules directly without external buffer stages. When designing with this part, ensure that the output-side bypass capacitor is placed within a few millimeters of the VCC and VEE pins, and that the gate resistor is selected to limit the peak gate current within the SOA. The stretched-body footprint has a different PCB land pattern from a standard SO-6 - PCB layouts are not interchangeable without redesign. This page synthesizes distributor pricing, drop-in pin-compatible alternatives, and practical gate-drive design notes that go beyond the manufacturer datasheet's typical application circuits.
FODM217A - DC Sensing Input Phototransistor Optocoupler | onsemi
The onsemi FODM217A is a single-channel, DC-sensing-input, phototransistor optocoupler housed in a half-pitch mini-flat 4-pin SOP package with 3,750 VACrms input-output isolation. The device integrates a gallium arsenide (GaAs) infrared LED optically coupled to a silicon phototransistor, providing galvanic isolation between low-voltage control logic and higher-voltage or noisy field circuits. Phototransistor optocouplers are isolation components that transfer electrical signals between two galvanically isolated domains using an optical link. The category sits within optoisolators -> optocouplers -> discrete semiconductor interface devices, and is widely used in industrial communication buses, PLC I/O, SMPS feedback loops, and microcontroller GPIO isolation. Compared with AC-input variants, DC-sensing-input optocouplers are tuned with a forward-only infrared LED polarity and use a polarised input stage, which lowers turn-on threshold variation across the temperature range and simplifies single-rail logic interfaces. Key features of the FODM217A include a wide operating temperature range from -40 C to +110 C, current transfer ratio (CTR) typically characterised at low collector currents for low-power logic interfaces, and 3,750 VACrms isolation voltage that satisfies reinforced insulation requirements in many industrial and consumer isolation standards. The half-pitch mini-flat 4-pin package enables compact PCB layouts and provides a typical creepage distance suitable for basic and reinforced insulation. The GaAs infrared emitter and phototransistor detector use mature onsemi process technology. The device exhibits a typical rise/fall time suitable for digital signal rates commonly encountered in GPIO isolation, comparator feedback, and low-speed serial data links. The 4-pin SOP configuration separates anode, cathode, emitter, and collector, allowing direct replacement of legacy 4-pin optocoupler footprints. Typical applications for the FODM217A include isolated digital signal transfer between microcontrollers and power inverters, PLC input/output modules, switched-mode power supply feedback paths, isolated gate-driver interfaces, and AC-line crossing detection circuits where DC-only input sensing is acceptable. When designing with this part, place a current-limiting resistor in series with the LED anode to set the forward current within the recommended operating range, and verify that the collector load resistance and supply voltage keep the phototransistor within its active region. This page synthesises distributor pricing, drop-in same-package alternatives, and practical design considerations that supplement the manufacturer datasheet to accelerate BOM selection and second-source qualification.
FODM217AR2 - 3750Vrms DC-Sensing Phototransistor Optocoupler | onsemi
The onsemi FODM217AR2 is a single-channel, DC-sensing input, phototransistor optocoupler housed in a compact half-pitch mini-flat 4-pin SOP package. It consists of a gallium arsenide (GaAs) infrared LED optically coupled to a silicon phototransistor, providing an input-to-output isolation voltage of 3750 Vrms and supporting collector-emitter voltages up to 80 V with a 50 mA collector current rating. The 4-SOP (MFP-4) package occupies a footprint of just 2.4 mm x 4.4 mm, making it one of the smallest isolation solutions in onsemi's phototransistor optocoupler family. A phototransistor optocoupler is a galvanic isolation device that transfers an electrical signal between two circuits using a short optical transmission path while providing a high-voltage safety barrier. The hierarchy is: optocoupler -> optoelectronic device -> semiconductor -> isolation component. Phototransistor output variants are preferred over triac or SCR outputs when the load is DC, low-frequency, or logic-level, because the output transistor can swing between saturation and cutoff cleanly. The FODM217AR2 specifically supports both AC and DC input signals, making it a general-purpose digital isolator for ground-loop elimination, signal level shifting, and noise-isolated logic interfacing. Key features include a current transfer ratio (CTR) range of 50% to 600% at IF=5 mA, a typical response time of 4 microseconds, and an operating temperature range of -40 C to +110 C. The half-pitch mini-flat (MFP) package is JEDEC-registered as a 4-pin SOP with 1.27 mm pitch and is compatible with surface-mount reflow profiles per IPC/JEDEC J-STD-020. The device is UL-recognized under file E90700 (File 1, Vol. 1) for reinforced insulation applications, supporting system-level compliance with IEC 60747-5-2 and DIN EN 60747-5-2. Internally the GaAs LED emits at a peak wavelength of 940 nm, matched to the silicon phototransistor's spectral responsivity peak. The base lead is not externally accessible on the FODM217AR2 (no base pin), simplifying board layout. The collector-emitter saturation voltage VCE(SAT) is rated 0.4 V maximum at IC=2.4 mA / IF=8 mA, ensuring logic-level compatibility with 3.3 V and 5 V CMOS. Compared with the higher-current FODM121 series, the FODM217 is optimized for lower-power signal paths where board real estate is critical. Typical applications include SMPS feedback loops, isolated digital logic interfaces, PLC input/output modules, industrial sensor isolation, and microcontroller-to-power-stage communication in motor drives. Its wide CTR range allows the designer to choose an input bias current that balances LED aging margin against power budget. When designing, observe minimum and maximum IF limits to avoid CTR degradation, and provide adequate creepage and clearance on the PCB to preserve the 3750 Vrms isolation rating across the package body.
HCPL-2212-500E - 5MBd Logic Gate Optocoupler | Broadcom
The Broadcom HCPL-2212-500E is a 5 MBd high-speed logic gate optocoupler housed in an 8-pin DIP Gull Wing surface-mount package with 3750 Vrms isolation. It combines a GaAsP LED input stage with an integrated CMOS logic output stage featuring push-pull / totem-pole drive. The -500E suffix denotes tape-and-reel packaging of the surface-mount gull-wing variant. An optocoupler (also called optoisolator) is a semiconductor device that transfers electrical signals between two isolated circuits using light. The HCPL-2212-500E belongs to the logic-output optoisolator family, where the photodetector stage is replaced by a logic gate. This places it in the hierarchy: optocoupler -> galvanic isolator -> signal isolator -> interface IC. Logic-output optoisolators are widely used for SPI, RS-232, RS-485, and inter-PECL signaling across an isolation barrier. Key features include a 5 MBd guaranteed data rate, a very high common-mode transient immunity (CMTI) of 10 kV/µs at 1000 V common-mode voltage, and a wide supply range of 4.5 V to 20 V on VCC. The internal Faraday shield guarantees superior CMR performance. The totem-pole output eliminates the need for a pull-up resistor on the output side, simplifying PCB layout. Typical applications include isolated data communication in industrial motor drives, programmable logic controller (PLC) I/O isolation, switching power supply feedback loops, isolated gate drive interfaces for power MOSFETs and IGBTs, and digital logic level shifting across high-voltage barriers. The 3750 Vrms isolation rating qualifies it for reinforced isolation per common safety standards. When designing with this device, ensure that the input LED forward current is set within the 1.6 mA nominal operating range using an appropriate external resistor. The internal CMOS output can source/sink directly, but trace length and capacitive loading should be minimized to preserve the 5 MBd data rate. A 0.1 µF VCC bypass capacitor placed close to pin 8 is recommended for stable operation.
HCPL-316J-000E - 2.5A IGBT Gate Drive Optocoupler | Broadcom
The Broadcom HCPL-316J-000E is a 2.5 A gate-drive optocoupler with integrated desaturation (VCE) detection and optically isolated fault status feedback, housed in a 16-pin SOIC surface-mount package. It combines a high-speed, high-current output driver, 5 kVrms reinforced galvanic isolation between input and output, local IGBT desaturation sensing with automatic shutdown, and an isolated fault feedback path in a single IC. The output stage swings between VCC2 and ground (VE), is rated for 2.5 A peak gate current, and supports IGBT gate voltages up to 30 V. An optocoupler (also called an opto-isolator) is a semiconductor device that transmits an electrical signal across an isolation barrier using light, providing galvanic isolation between input and output while allowing high-speed signal transfer. Within the broader hierarchy of isolators - which include digital isolators (capacitive or inductive coupling), transformer isolators, and isolated gate drivers - the gate-drive optocoupler sits at the interface between low-voltage control logic and high-voltage power stages. Gate-drive optocouplers specifically integrate the LED, photodetector, and a power output stage into one package, eliminating the need for a separate isolated supply on the secondary side in many topologies. Key features include 2.5 A peak gate-drive output current, 5000 Vrms transient isolation voltage (VIORM reinforced), 2.0 A continuous output current, integrated VCE desaturation detection with programmable blanking, optically isolated open-collector fault feedback, under-voltage lockout (UVLO) for the secondary supply, and 500 ns typical propagation delay. The wide operating temperature range of -40 C to +100 C supports industrial and motor-drive environments, while the SO-16 footprint is industry standard for IGBT gate drivers. The device uses an AlGaAs LED on the input, a CMOS driver with integrated desaturation comparator, and a high-speed GaAs photodetector driving a totem-pole output stage. The architecture allows direct interface to 3.3 V or 5 V microcontrollers on the primary side while delivering clean, high-current gate pulses to IGBTs or power MOSFETs on the secondary side. Typical applications include isolated IGBT/MOSFET gate drives in motor-control inverters, industrial servo drives, solar inverters, UPS systems, induction heating, and EV traction inverters. The integrated desaturation detection protects against IGBT short-circuit events without requiring external comparator circuits. When designing with this part, place a 0.1 uF bypass capacitor close to VCC2 and a 4.7 uF bulk on VEE2, select the DESAT blanking capacitor to mask IGBT turn-on transients, and route the fault pin through the MCU interrupt for sub-microsecond shutdown response. This page synthesizes distributor pricing, drop-in alternatives, and practical design guidance not found in the manufacturer datasheet alone.
ILD2-X007T - Dual-Channel Phototransistor Optocoupler, 5300Vrms | Vishay
The Vishay ILD2-X007T is a dual-channel phototransistor-output optocoupler that combines a GaAs infrared LED with two silicon NPN phototransistors optically coupled in a single 8-pin SMD (Gull Wing) package. It provides 5300 Vrms of input-to-output isolation, CTR greater than 100% (ILD2 CTR bin), and is delivered on tape-and-reel (T suffix) for high-volume SMT assembly. The device is the SMD -X007T tape-and-reel variant of the ILD2-X009T through-hole part, sharing identical electrical and isolation ratings. A phototransistor optocoupler is a galvanic isolation device that transfers an electrical signal between two circuits using a short optical transmission path. The category hierarchy is: optocoupler (optoisolator) -> transistor-output optoisolator -> signal isolation device -> interface IC -> semiconductor. Phototransistor optocouplers are used wherever a low-speed logic or analog signal must cross an isolation barrier without galvanic conduction, replacing slower, larger, or less reliable electromechanical solutions in industrial, medical, and consumer systems. Key features of the ILD2-X007T include: dual independent channels in one package (half the PCB footprint of two singles); 5300 Vrms isolation voltage (per Vishay test method) for reinforced insulation in mains-coupled circuits; CTR > 100% at IF = 10 mA, VCE = 10 V for high-transfer-ratio signal paths; 70 V collector-emitter breakdown voltage; 100 mA forward current rating; -55 C to +100 C operating temperature range; and surface-mount 8-SMD gull-wing lead form compatible with IR reflow. The architecture is a GaAs infrared LED die optically coupled to two silicon NPN phototransistor dies inside a single molded DIP-derived SMD body. The base of each phototransistor is brought out to an external pin, enabling designers to bias the base (typically through a resistor to ground) to adjust switching speed and CTR. With the base open, the part operates as a standard phototransistor output with typical switching times in the 2-20 microsecond range, suitable for logic-level signaling, feedback paths in switch-mode power supplies, and analog signal isolation below about 100 kHz. Typical applications of the ILD2-X007T include: logic-to-logic interfacing between microcontrollers and 230 VAC-referenced triac drivers; feedback in isolated AC-DC and DC-DC converters (primary-to-secondary optocoupler); industrial PLC input modules; medical patient-isolation circuits; and digital instrumentation that must meet IEC 60747-5-2 reinforced insulation requirements. The wide CTR margin (>100%) simplifies drive-circuit design and tolerates LED aging in long-life products. Design trade-offs: phototransistor optocouplers are slower than high-speed (logic-gate) optocouplers and add LED drive current to the BOM. The -X007T SMD form is chosen where automated assembly and isolation barrier height are both required; the through-hole ILD2-X009T version is preferred for hand-prototyping and high-voltage creepage. This page synthesizes distributor stock levels, drop-in replacements, dual-channel alternatives, and design notes drawn from manufacturer datasheets and parametric cross-references - data not collated on a single distributor page.
LTV-354T-C - AC Input Phototransistor Optocoupler | Lite-On | 4-SOP
The Lite-On LTV-354T-C is an AC-input, transistor-output optocoupler housed in a compact 4-pin mini-flat (4-SOP) surface-mount package, providing 3750 Vrms of galvanic isolation between input and output. The part features a wide operating temperature range and is supplied on tape-and-reel for high-volume automated assembly. The AC-input stage accepts bidirectional LED drive, eliminating the need for orientation-sensitive DC biasing and simplifying AC-line-coupled logic-interface designs. An optocoupler (also called an opto-isolator or photocoupler) is a semiconductor device that transmits electrical signals between two isolated circuits using light. The LTV-354T-C belongs to the transistor-output optoisolator subfamily, where an infrared LED on the primary side drives a phototransistor on the secondary side. Within the broader component taxonomy, this places the LTV-354T-C as: optocoupler -> optoisolator -> transistor-output optoisolator -> isolator -> discrete semiconductor interface component. Optocouplers are essential for breaking ground loops, protecting low-voltage logic from high-voltage transients, and providing safety isolation in industrial and consumer equipment that connects to AC mains. Key features of the LTV-354T-C include a minimum 50 mA forward current capability, 4 us typical rise time and 3 us typical fall time, and JEDEC22A111-compliant wave soldering at 260 +0/-5 C for 10 seconds. The 4-SOP (mini-flat) package footprint is one of the smallest standard optocoupler outlines available, enabling dense PCB layouts in space-constrained designs such as programmable logic controllers, switching power supply feedback loops, and digital logic isolators. Internally the LTV-354T-C uses two infrared LEDs connected in inverse parallel to form the AC input. This bidirectional input topology supports either AC or DC drive polarity, allowing the same part to be used in both half-wave and full-wave rectifier feedback paths. The phototransistor output provides linear transfer characteristics suitable for both analog signal isolation and digital logic-level shifting. Typical applications include isolated gate-drive interfaces for power MOSFETs and IGBTs, SMPS primary-to-secondary feedback, AC-line detection circuits, PLC input modules, and ground-loop elimination in industrial sensor interfaces. The 4-SOP footprint and 3750 Vrms isolation voltage also make it suitable for medical equipment meeting basic IEC 60601 isolation requirements. When designing with the LTV-354T-C, place a current-limiting resistor in series with the LED input based on forward voltage (typically 1.2 V at 20 mA) and observe the maximum forward current rating. A pull-up resistor on the transistor collector sets the logic high level; the CTR (current transfer ratio) determines the collector current for a given LED forward current. This page synthesizes verified Lite-On datasheet specifications, drop-in 4-SOP optocoupler alternatives, and practical design notes that go beyond the manufacturer's product brief.
LTV-817S-TA1-C - 5 kVrms Optocoupler, 50% CTR | Lite-On
Lite-On LTV-817S-TA1-C is a single-channel, DC-input, phototransistor-output optocoupler with a 5,000 Vrms isolation rating, minimum current transfer ratio of 50% at IF = 5 mA and VCE = 5 V, and a compact 4-pin surface-mount package. It transfers signals across an electrically isolated barrier while providing high-density PCB mounting for industrial, control, and power-conversion systems. An optocoupler, also called an optoisolator, combines a light-emitting diode with a light-sensitive transistor. The optical path provides galvanic isolation between input and output, preventing ground currents, high-voltage transients, and common-mode disturbances from coupling directly into the protected circuitry. The LTV-817 series belongs to the optocoupler family within optoelectronic semiconductors and is widely used where signal must cross a safety or functional isolation barrier. Key features include high-density mounting, a 50% minimum CTR bin, and 5,000 Vrms input-output isolation. The verified distributor listings identify one output channel, transistor output, 4-SMD construction, and a compact dual-in-line-compatible surface-mount footprint. The TA1 ordering code identifies the surface-mount taping variant, while the -C suffix identifies the 50% CTR grade. These details allow designers to distinguish the target from base-package, higher-CTR, and other taping variants without changing the electrical function. The transistor output operates primarily in the open-collector configuration. A pull-up resistor is required at the output to convert collector current into a voltage. Designers must account for CTR binning, load resistance, propagation delay, response time, input drive current, and the operating temperature of the complete circuit. The supplied verified data identifies a 4 microsecond response characteristic at 2 mA and 100 ohms in one distributor listing, but full timing curves and test conditions should be confirmed in the manufacturer datasheet. Typical applications include isolated control signals in switching power supplies, industrial automation interfaces, motor-control circuits, programmable controllers, and general galvanic-isolation interfaces. The isolation barrier is useful when the output domain has a substantially different ground reference from the input domain or when high switching nodes must be separated from sensitive logic. The principal design consideration is treating CTR as a design parameter, not a guarantee. The minimum CTR applies at specified test conditions and may vary with temperature, forward current, and collector voltage. Confirm the load resistor and worst-case CTR using the Lite-On datasheet, especially in power-conversion systems with long trace paths or demanding isolation requirements. This page synthesizes verified distributor data, manufacturer datasheet links, same-package alternatives, and practical selection guidance for engineers evaluating the LTV-817S-TA1-C.
MOC3021S-TA1 - 400V Triac Driver Optocoupler, 6-SMD | Lite-On
The Lite-On MOC3021S-TA1 is a 6-pin SMD triac-driver optocoupler that combines a GaAs infrared emitting diode with a light-activated silicon bilateral switch (LASCR), providing 5000 Vrms input-to-output isolation and a minimum repetitive peak off-state voltage (VDRM) of 400 V. Packaged in a 6-SMD gull-wing surface-mount carrier of the MOC3020-through-MOC3023 series family, it is designed to interface low-voltage logic (microcontrollers, logic-level gates) with mains-voltage triacs that switch resistive or inductive AC loads. An optotriac or triac-driver optoisolator is a category of optocoupler whose output stage is a photosensitive silicon switch that emulates a triac. The category sits within the broader optocoupler family (LED-photodetector isolation devices) and the wider signal-and-power isolation hierarchy. Triac-driver optoisolators are used wherever a low-power control circuit must command a high-voltage AC load while maintaining galvanic isolation for safety and noise immunity. Key features of the MOC3021S-TA1 include: 5000 Vrms isolation voltage (Viso), 400 V minimum repetitive peak off-state voltage (VDRM), 100 V/us minimum critical rate of rise of off-state voltage (dV/dt), a forward input LED current typically driven at 10-15 mA (IF on = 8 mA max per datasheet), and a peak on-state output current of 1 A. The device is a non-zero-cross (random-phase) triac driver; it triggers the load triac on the next available mains half-cycle regardless of the AC line voltage crossing point, which makes it suitable for resistive heating loads but less ideal for low-power or highly inductive loads where EMI must be minimized. The device operates as an optically-coupled trigger: the input LED emits infrared light proportional to forward current; the light strikes the photosensitive silicon bilateral switch, which latches into conduction once its threshold is exceeded. This optical coupling provides the 5000 Vrms safety barrier while the silicon switch handles the AC line voltage on the load side. Typical applications include solid-state relays (SSRs), AC motor speed controllers, lamp dimmers, solenoid and valve drivers, industrial controls, and interface circuits between microcontrollers and triac-SCR power stages controlling AC mains loads up to 400 V peak (approximately 240 VAC RMS mains). When designing with this device, note that the MOC3021S-TA1 is a non-zero-cross driver; if zero-cross switching is required (to reduce EMI and inrush current on inductive loads), select the MOC3041S or MOC3042S/3043S family members instead. A snubber RC network (typically 100 ohm + 0.01 uF) across the triac is recommended for inductive loads. This page synthesizes distributor pricing, drop-in replacement alternatives, and practical design notes not found in the Lite-On datasheet alone, helping engineers select and source the MOC3021S-TA1 with full parametric and supply-chain context.
MOC3021S-TA1-A - 400V Random-Phase TRIAC Optocoupler SMD-6
The Lite-On MOC3021S-TA1-A is a 4-pin SMD triac-driver optoisolator providing 5000 Vrms input-to-output isolation with a 400 V repetitive peak off-state voltage (VDRM) and a minimum 100 V/us critical rate of rise of off-state voltage (dV/dt), housed in a 6-pin SMD gull-wing package. It integrates a GaAs infrared-emitting diode optically coupled to a light-activated silicon bilateral switch (a non-zero-crossing/triac output stage). The suffix -A indicates an AEC-Q-style tape-and-reel orientation variant of the MOC3021S-TA1 family. A TRIAC-driver optoisolator is an optocoupler whose output stage is a photo-triggered bilateral thyristor (TRIAC), used to bridge low-voltage logic and a mains- or AC-line-driven TRIAC while providing galvanic isolation. In the component taxonomy, MOC3021S-TA1-A belongs to the optocoupler family, then to TRIAC/SCR-output optoisolators, then to signal/power isolation devices, and finally to discrete semiconductors / isolation components. Key features include random-phase triggering (no zero-crossing detection), an input forward current (IF) of typically 10-15 mA for guaranteed trigger, a peak off-state voltage of 400 V minimum, a holding current (IH) of about 100 uA, and a 6-pin SMD footprint that supports automated assembly. The non-zero-crossing behavior means it can trigger at any point on the AC sinusoid, making it well suited to phase-angle control circuits such as lamp dimmers and motor-speed controllers. Optically, the device pairs a high-efficiency GaAs IR LED with a photosensitive TRIAC chip mounted on a ceramic isolation substrate inside a clear epoxy body. The 5000 Vrms isolation barrier (Viso function) exceeds IEC 60747-5-2-style reinforced isolation requirements for line-voltage interface circuits, and the minimum 100 V/us dV/dt ensures the output TRIAC will not latch on falsely due to fast AC-line transients. Typical applications include solid-state relay (SSR) front-ends, AC lamp dimmers, small AC motor drivers, solenoid drivers, and interface circuits for microcontrollers driving line-voltage TRIACs. Designers choose this part when they need a non-zero-crossing (random-phase) trigger so phase-angle modulation becomes possible. When designing with this part, place a buffer resistor and snubber network across the output TRIAC, and remember that this part triggers at any phase angle - it does not wait for the next zero-cross. For zero-crossing loads, choose a MOC3041/MOC3043 instead. The SMD gull-wing package requires careful solder-pad design for clean reflow. This synthesis integrates distributor pricing, drop-in alternatives, and practical design notes - information not found directly in the manufacturer datasheet.
OPI110C - 10kV Optically Coupled Isolator, NPN Phototransistor | Optek / TT Electronics
The Optek / TT Electronics OPI110C is an optically coupled isolator consisting of a gallium aluminum arsenide infrared Light Emitting Diode (LED) emitting at 890 nm coupled to a NPN silicon phototransistor detector, housed in an axial 4-pin plastic through-hole package. It provides a minimum of 10000 VDC isolation voltage between input and output, with 15000 VDC isolation per the distributor listing, making it suitable for high-voltage isolation in industrial control and medical equipment. The current transfer ratio (CTR) is specified at a minimum of 50% at IF = 10 mA and VCE = 10 V. An optocoupler (also called an optoisolator) is a semiconductor device that transfers electrical signals between two isolated circuits using light. The infrared LED on the input side converts an electrical signal into infrared light, which crosses a transparent insulating barrier and is detected by a phototransistor on the output side. Because light is the only medium of coupling, galvanic isolation of thousands of volts is achieved while the data or control signal still passes through. The OPI110C belongs to the broader category of transistor-output optocouplers, which sit inside the hierarchy: optocoupler -> isolator -> optoelectronic component -> semiconductor device. Key specifications of the OPI110C include a forward DC current of 40 mA maximum, peak forward current of 1 A (1 ms pulse), reverse voltage of 6 V, collector-emitter voltage of 30 V, and power dissipation of 100 mW. The 890 nm LED wavelength is matched to the silicon phototransistor spectral response, providing efficient optical coupling. The device operates over a temperature range suitable for industrial environments. The axial package provides a 0.5 inch (12.7 mm) pitch, allowing standard PCB through-hole mounting or wiring into a custom insulating fixture. Compared to surface-mount optocouplers, the axial OPI110C is favored when maximum creepage distance and through-hole mechanical strength are required, especially in high-voltage or high-noise environments. Typical applications include isolated signal interfacing in industrial PLCs, switch-mode power supply (SMPS) feedback loops, medical patient-monitoring equipment, high-voltage probe isolation, and ground-loop elimination in data acquisition systems. The 10 kV rating enables use where regulatory standards require reinforced or double insulation. When designing with the OPI110C, observe the absolute maximum LED forward current of 40 mA continuous to prevent degradation. Add a series resistor to limit forward current, and consider CTR degradation over time when budgeting CTR for the end of life of the design. This page synthesizes distributor pricing, verified parametric data, drop-in alternatives and practical design guidance drawn from the TT Electronics / Optek OPI110C datasheet and current distributor listings (DigiKey, Mouser, LCSC).
OPI1264B - 10kV Optically Coupled Isolator, NPN Output, Axial
The TT Electronics / Optek Technology OPI1264B is an optically coupled isolator integrating an 890 nm infrared LED and an NPN silicon phototransistor inside an opaque axial package with a transmissive internal optical path. It delivers a 10 kV DC isolation voltage, transfers analog or digital signals across a galvanic barrier, and is qualified for industrial, medical, and instrumentation systems where high-voltage safety isolation is mandatory. An optocoupler (also called an optoisolator) is a semiconductor device that conveys an electrical signal between two circuits using a short optical transmission path while maintaining electrical isolation between input and output. The hierarchy is: optocoupler -> isolator -> interface IC -> semiconductor. Optocouplers are essential in the signal chain when a low-voltage control domain (logic, MCU) must interface with a high-voltage or noisy domain (motor drive, power stage, medical patient circuit) without a galvanic connection, providing both safety isolation and noise immunity. Key features include a typical Current Transfer Ratio (CTR) of 50 percent at If = 10 mA, a collector-emitter breakdown of 30 V or higher, an isolation voltage of 10 kV DC between input and output, and a wide operating temperature window of -55 to +100 C. The 4-pin axial through-hole form factor suits PCB layouts where creepage and clearance distances must be maximised on a single physical axis, which is harder to achieve with flat DIP optocouplers. The OPI1264B uses a hermetically opaque molded body to block ambient light, ensuring the phototransistor responds only to the internal IR LED. The LED's 890 nm wavelength is matched to the silicon phototransistor's peak responsivity (~850-900 nm) for efficient optical coupling. Compared to flat-package alternatives, the axial lead geometry lengthens the isolation path, which is the primary mechanism behind the 10 kV rating rather than higher internal dielectric strength. Typical applications include switch-mode power supply (SMPS) feedback loops, medical patient-isolation interfaces, industrial PLC I/O modules, solar inverter gate-drive feedback, and high-voltage analog signal acquisition. The device is commonly placed in the feedback path of an isolated AC-DC converter or as a digital signal isolator between a microcontroller and a 230 V AC / 400 V DC bus. Design consideration: derate CTR with temperature - at +85 C, CTR drops to roughly 50-60 percent of its +25 C value. Always select the input forward current with adequate margin (typically 1.5x to 2x the minimum needed at room temperature) so that end-of-life CTR and temperature derating do not push the design out of regulation. A base-emitter resistor (typically 1 MΩ to 10 MΩ) across the phototransistor speeds turn-off and prevents leakage-induced false turn-on in DC-coupled applications.
PS2501-1 - 5000Vrms 1-Ch NPN Phototransistor Optocoupler | Renesas
The Renesas PS2501-1 is a high-isolation-voltage single-transistor optocoupler consisting of a GaAs infrared light-emitting diode optically coupled to an NPN silicon phototransistor in a 4-pin plastic DIP (Dual In-line Package). It provides 5000 Vrms minimum isolation voltage, 1 channel, and a typical current transfer ratio (CTR) of 80% (IF=5 mA, VCE=5 V), making it a workhorse isolation device for industrial and consumer switching applications. An optocoupler, also called an optoisolator or photocoupler, is a semiconductor device that transmits electrical signals between two isolated circuits using an internal optical pathway. The hierarchy is: optocoupler -> isolator -> signal isolation component -> optoelectronic device. PS2501-1 sits inside the larger category of transistor-output optocouplers (as opposed to triac-output, MOSFET-output, or logic-output types), and is used where designers need galvanic isolation up to a few kV combined with simple analog or digital signal transfer. Key features include a wide operating temperature range of -55C to +100C, a collector-emitter voltage (VCEO) of 40 V, collector current up to 40 mA, response time tr/tf in the microsecond range, and a GaAs LED emitter that operates from IF = 5 to 50 mA. The 4-DIP through-hole pinout is pin-compatible with industry-standard 4-pin optocouplers (1: LED+, 2: LED-, 3: emitter, 4: collector), enabling drop-in substitution in existing designs. The plastic DIP body is supplied in standard 6-pin DIP lead-pitch (0.3"/7.62 mm spacing) for easy PCB integration. Typical applications include AC-line detection circuits, programmable logic controller (PLC) input/output modules, switching power supply feedback loops, microcomputer input interfaces, and analog signal isolation in test and measurement equipment. The 5000 Vrms isolation rating makes it suitable for medical and industrial equipment where regulatory isolation barriers are required (UL 1577, IEC 60747-5-5 class conditions apply to the family when so marked). When designing with the PS2501-1, add a base-to-emitter resistor (typically 100 kOhm to 1 MOhm) when the application is sensitive to dv/dt induced turn-on, and bypass the LED supply with at least 0.1 uF in parallel with 10 uF to keep the input side stable. The CTR degrades over time at high IF and high temperature - derate CTR to roughly 50% of the nominal value for designs with a 10-year operating-life target. This page consolidates distributor pricing for the PS2501-1, lists available drop-in alternatives from Renesas and cross-brand manufacturers, and includes practical design notes that go beyond the manufacturer datasheet to help engineers select the right optocoupler for their isolation stage.
PS2501-1-A - 5000Vrms Optocoupler, NPN Photo Transistor, DIP-4 | Renesas
The Renesas PS2501-1-A is a high-isolation-voltage single-channel transistor-output optocoupler that integrates a gallium-arsenide (GaAs) infrared LED optically coupled to an NPN silicon phototransistor. It provides 5000 Vrms isolation voltage between input and output, a collector-emitter voltage of 80 V, and comes in a 4-pin DIP through-hole package. The current transfer ratio (CTR) is specified at 80% to 600% at IF=5 mA, VCE=5 V. A photocoupler (also called an optoisolator) is a semiconductor device that transfers electrical signals between two isolated circuits using an internal optical path. Phototransistor-output optocouplers like the PS2501-1-A belong to the optocoupler family, which is a subset of isolation ICs and ultimately of interface ICs. They provide galvanic isolation - blocking high voltages, transients, and ground loops while allowing low-speed logic-level signal transfer. Compared to alternative isolation technologies (transformer isolation, digital isolators), optocouplers offer the lowest cost and longest field-proven track record for switching and DC signal isolation below about 1 MHz. Key features of the PS2501-1-A include 5000 Vrms isolation voltage, 80 V collector-emitter breakdown voltage, 50 mA collector current, -55 to +100 C operating temperature range, and a GaAs LED input that operates at 1.2 V typical forward voltage at 10 mA. The device is designed for AC-DC line voltage sensing and is widely used where robust isolation in a compact DIP footprint is required. The black plastic molded body has UL94-V0 flammability rating. The PS2501-1-A uses a GaAs infrared LED input stage and a silicon NPN phototransistor output stage separated by a transparent insulating film. Light emitted by the LED when forward-biased passes through the isolation barrier and strikes the phototransistor base, generating a collector current proportional to the LED forward current. This optical coupling eliminates electrical conduction paths between the two sides while preserving linear signal transfer up to several hundred kHz. Typical applications include switching power supply feedback loops, programmable logic controller (PLC) input/output isolation, AC line voltage sensing, microcontroller digital input isolation, and ground-loop elimination in industrial automation equipment. The DIP-4 package allows easy hand-soldering and breadboard prototyping while still offering industry-standard pin spacing. When designing with the PS2501-1-A, ensure the input-side IF current is sized within the safe operating area, and add a 100 kohm base-to-emitter resistor on the output transistor to improve switching speed and reduce noise. For high-noise industrial environments, a CTR buffer (e.g., operating at 50% of the minimum CTR) provides margin against aging and temperature drift. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
PS2501L-1-F3-A - 5000Vrms Optocoupler, 4-SMD, Gull-Wing | Renesas
The Renesas PS2501L-1-F3-A is a single-channel, transistor-output optocoupler (photocoupler) integrating a GaAs infrared light-emitting diode optically coupled to an NPN silicon phototransistor, housed in a 4-SMD gull-wing lead-bending surface-mount package. It provides 5000 Vrms of input-to-output isolation, an 80 V minimum collector-emitter breakdown voltage, and supports a maximum forward current of 80 mA on the LED side, making it a drop-in workhorse for low-speed digital signal isolation. According to the Renesas datasheet, the PS2501L-1 is the gull-wing (surface-mount) variant of the PS2501-1 through-hole DIP family, sharing the same die and electrical characteristics. A photocoupler (optocoupler or optical isolator) is a semiconductor device that transfers electrical signals between two isolated circuits using a short optical transmission path. It contains an LED on the input side and a photosensitive device (here a phototransistor) on the output side, separated by a transparent insulating barrier. Within the broader component taxonomy, the PS2501L-1-F3-A falls under Optocouplers & Isolators -> Phototransistor Output Optocouplers -> DC-Input Single-Channel Optocoupler, used wherever logic-level or analog signals must cross a galvanic isolation barrier. Key features include 5000 Vrms input-to-output isolation voltage (Viso), typical current transfer ratio (CTR) ranging from 80% to 600% depending on rank, a wide operating temperature range of -55°C to +100°C, and a saturation Vce of typically 0.1 V to 0.2 V at low currents. The 4-SMD gull-wing package simplifies reflow soldering versus the through-hole PS2501-1, supporting high-density PCB assembly and automated pick-and-place. Response times of 3 microseconds (ton) and 5 microseconds (toff) make it suitable for interfacing low-frequency logic, feedback loops, and noisy industrial buses. The PS2501L-1-F3-A uses a GaAs LED and a silicon phototransistor in a Darlington-style topology (single transistor here). Its design emphasizes high common-mode transient immunity thanks to the inherent optical coupling, eliminating ground loops between primary and secondary sides. Multiple CTR bins (A, B, C, D, E) allow designers to select a current transfer ratio suited to their specific application. Typical applications include isolated power supply feedback, microcontroller I/O isolation, PLC input/output modules, switching power supply primary-to-secondary feedback paths, and AC line voltage monitoring interfaces. Designers choose this part when a proven, broadly available 4-pin optocoupler is needed in a surface-mount package. When designing with this device, place a current-limiting resistor in series with the LED input, sized to set IF between 5 mA and 20 mA nominal. The base pin (pin 6 in the through-hole variant; refer to datasheet for SMD mapping) is typically left open or used with a base-emitter resistor to tweak switching speed. This page synthesizes distributor pricing, drop-in gull-wing alternatives, and practical SMT layout notes not gathered in the manufacturer datasheet alone.
PS2506-4 - 4-Ch Darlington Optocoupler, 5000Vrms, 16-DIP
The California Eastern Laboratories (CEL, originally NEC) PS2506-4 is a 4-channel optically coupled isolator that integrates a GaAs (Gallium Arsenide) infrared light-emitting diode with an NPN silicon Darlington-connected phototransistor in a single 16-pin DIP package. It provides 5000 Vrms minimum isolation voltage between input and output, 40 V collector-emitter breakdown, and 160 mA per-channel output current capability with high current transfer ratio (CTR) typical of Darlington topologies. The AC-input compatibility allows the device to respond to both DC and bidirectional input signals, making it well-suited for digital logic interfaces and zero-crossing detection circuits. An optocoupler (also called opto-isolator or photocoupler) is a semiconductor device that transmits electrical signals between two isolated circuits using infrared light. The internal LED on the input side converts the electrical signal into light; a phototransistor on the output side converts the light back into an electrical signal, with a galvanically-isolated barrier (typically a polymer or silicone dielectric) blocking any direct electrical conduction between the two sides. Optocouplers belong to the broader hierarchy: optocoupler -> isolator -> signal conditioner -> interface IC -> semiconductor, and are essential where high-voltage isolation, ground-loop elimination, or noise rejection between control and power domains is required. Key features of the PS2506-4 include a wide operating temperature range of -55 C to +100 C (industry standard for the PS2506 series), Darlington output for high gain without external amplification, and 5000 Vrms high-isolation-voltage rating that exceeds the common 2500-3750 Vrms threshold of standard optocouplers. The 16-DIP through-hole package enables robust PCB mounting for industrial environments. The Darlington output stage provides typical CTR values significantly higher than single-transistor optocouplers, eliminating the need for additional amplification stages in many interface designs. The PS2506-4 uses a GaAs infrared LED emitter coupled to a silicon NPN Darlington phototransistor. The Darlington configuration (two transistors cascaded) provides current gain approximately equal to the product of the individual transistor gains, yielding CTR values commonly in the 600-8000% range depending on operating conditions. The internal isolation barrier is a molded compound providing reinforced insulation. The 4-channel integration within a single package saves board space compared to discrete single-channel optocouplers and ensures matched channel-to-channel performance for multi-line interfaces. Typical applications include PLC (Programmable Logic Controller) input/output modules, industrial control system isolation, AC line voltage monitoring, microcontroller-to-power-stage interface isolation, telecom equipment signal isolation, and digital logic ground isolation. The wide temperature range and robust DIP package also suit process control and factory automation equipment. When designing with the PS2506-4, ensure that the input-side forward current (IF) is within the recommended operating range (typically 5-20 mA) for the desired CTR, and that the output collector-emitter voltage does not exceed 40 V. A pull-up resistor on the output collector is required to define the logic-high level when the phototransistor is off. For high-noise environments, add a 0.1 uF bypass capacitor across the supply rail close to the output pin.
PS2561L2-1-V-A - 5000Vrms Phototransistor Optocoupler, 4-SMD | Renesas
The Renesas Electronics PS2561L2-1-V-A is a single-channel, high-isolation phototransistor optocoupler housed in a 4-pin SMD (Gull-wing, wide-lead long-creepage) package. It contains a GaAs infrared LED optically coupled to an NPN silicon phototransistor and provides 5000 Vrms of input-to-output isolation. The -L2 suffix indicates the wide lead-bending Gull-wing variant for surface mounting with an extended creepage distance, while the -A suffix denotes tape-and-reel packaging for high-volume assembly. Output transistor ratings reach 80 V VCEO and 50 mA collector current with a maximum VCE(sat) of 300 mV, making it well-suited to industrial logic-level isolation. An optocoupler (also called an optoisolator or photocoupler) is a semiconductor isolation device that transmits an electrical signal between two circuits using a short optical or infrared light path while maintaining a galvanic isolation barrier. Phototransistor optocouplers are the most common subtype, using an infrared LED on the input side and a phototransistor on the output side. They sit within the broader hierarchy: optocoupler -> isolator -> semiconductor -> optoelectronic component. Their key role is breaking ground loops, protecting low-voltage logic from high-voltage transients, and providing reinforced safety isolation in industrial, medical, and renewable-energy systems. Key features include a wide operating temperature range, GaAs LED input with low forward current requirements (IF typ. around 5-10 mA), and a CTR (Current Transfer Ratio) characterized across multiple rank grades for design flexibility. The 4-SMD Gull-wing footprint with extended creepage improves PCB-level isolation and resists surface contamination in harsh environments. The PS2561L2-1 uses an LED-phototransistor architecture: the input GaAs diode emits infrared light when forward-biased, and the integrated NPN phototransistor conducts proportionally to the received optical flux. This purely optical coupling path eliminates ground loops and rejects common-mode transients up to the rated isolation voltage. The wide-lead package improves creepage, helping designs meet IEC 60747-5-5 reinforced insulation standards. Typical applications include PLC digital input modules, isolated gate-drive bias for power MOSFETs/IGBTs, switching power supply feedback loops, isolated communication interfaces (RS-485/232), and industrial process-control isolation barriers. When designing, ensure the IF bias resistor limits LED current within the absolute maximum ratings and add a base-emitter resistor to control dark current. Always respect the creepage/clearance requirements of the end-product safety standard (IEC 60950, IEC 62368-1, or IEC 61010-1 for industrial). This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the standalone manufacturer datasheet, making component selection and sourcing faster for engineers.
PS2801A-1-A - 2500Vrms SSOP-4 Phototransistor Optocoupler | Renesas
The Renesas PS2801A-1-A is a single-channel phototransistor-output optoisolator that integrates a GaAs infrared LED and an NPN silicon phototransistor in a 4-pin SSOP (Shrink Small Outline Package) with a built-in ambient-light shield. The device provides 2500 Vrms of galvanic isolation between input and output, a maximum collector-emitter voltage (VCEO) of 70 V, and supports DC input on the LED side with a typical forward voltage of 1.2 V. Current Transfer Ratio (CTR) ranges from 50% to 400% at IF = 5 mA / VCE = 5 V, with typical rise/fall times of 3 microseconds and 5 microseconds respectively, enabling robust digital signal isolation up to moderate data rates. What is an optocoupler? An optocoupler (also called optoisolator or photocoupler) is a semiconductor device that transfers electrical signals between two isolated circuits using light. It contains an infrared LED on the input side optically coupled to a photosensitive detector (phototransistor, phototriac, or photodarlington) on the output side. Optocouplers sit within the broader hierarchy: optocoupler -> isolator -> signal conditioning -> analog/mixed-signal IC -> semiconductor. They are essential for breaking ground loops, providing safety isolation in industrial interfaces, and protecting low-voltage digital logic from high-voltage transients on field-side wiring. Key features of the PS2801A-1-A include the SSOP-4 footprint which is approximately 35% smaller than a standard SOP-4, enabling high-density PCB layouts in space-constrained designs. The integrated shield effectively blocks ambient light from interfering with the phototransistor's base region, reducing susceptibility to false triggering under bright illumination. The device supports an operating temperature range of -55 °C to +100 °C, and uses Pb-free / RoHS-compliant materials per Renesas manufacturing standards. From an architectural standpoint, the PS2801A-1-A uses an NPN epitaxial silicon phototransistor rather than a photodarlington, which limits CTR to a maximum of 400% (versus >1000% for darlington optos) but provides markedly faster switching speeds (~3 us rise vs ~50 us for darlington) and superior linearity for analog signal isolation. The GaAs LED is optimized for 940 nm peak emission, matched to the phototransistor's spectral response for maximum quantum efficiency. Typical applications include digital logic isolation in PLCs and industrial control systems, isolated gate-drive interfaces, communication line isolation in RS-232/RS-485 transceivers, and feedback path isolation in switching power supplies. The 70 V VCEO rating is sufficient to interface directly with 24 V industrial logic levels. The wide CTR range (50-400%) requires design margin; bias resistors must be selected to guarantee saturation and switching at end-of-life CTR (typically 50%). When designing with this device, calculate the input-side current using IF = (VF + VF_LED_margin) / RLED, ensuring IF remains in the 5-20 mA linear region for stable CTR. On the output side, choose a collector resistor (RL) that keeps the phototransistor out of saturation for analog applications, or fully saturated for digital switching. Add a base-emitter resistor (typically 1-10 MΩ) to improve noise immunity and switching speed. Always observe the 2500 Vrms isolation voltage in creepage/clearance calculations for end-product safety certifications (UL 1577, IEC 60747-5-5). This page synthesizes distributor pricing, drop-in replacement alternatives from Renesas and competing optocoupler families, and practical PCB layout guidance not found in the standalone datasheet PDF.
PVI5080NSPBF - Single-Channel Photovoltaic Isolator 8-SMD | Infineon
The Infineon PVI5080NSPBF is a single-channel photovoltaic isolator housed in a surface-mount 8-SMD package that generates an electrically isolated DC output voltage upon receipt of a DC input signal. The device is capable of directly driving the gates of power MOSFETs or IGBTs with an open-circuit output voltage of 8 V (typical 9 V short-circuit) and supports a load voltage maximum of 8 V DC. The isolator provides 4000 Vrms galvanic isolation between the low-level driving circuitry on the input side and the high-energy or high-voltage load circuit on the output side. A photovoltaic isolator (PVI) is a solid-state optocoupler whose output stage is a monolithic photovoltaic generator rather than a phototransistor, BJT, or triac. When the input LED is energized, the monolith converts the optical flux back into a low-current DC voltage that can be used as a floating bias supply. This places PVIs in the same functional family as gate-drive optocouplers and solid-state relays, but with the unique ability to deliver a self-powered floating rail for gate charge, eliminating the need for an isolated bias supply on the high-side. Key features include 4000 Vrms input-to-output isolation, an open-circuit output voltage of approximately 8 V (sufficient for standard-threshold power MOSFETs and most IGBTs), a typical short-circuit current of 10 µA per channel, and a 50 mA maximum continuous forward input current. The integrated fast turn-off network accelerates the discharge of the gate capacitance when the input is removed, reducing turn-off delay in switched-mode designs. The 8-SMD (modified 8-pin SOIC-style) footprint supports standard SMT reflow and allows the part to replace electromechanical relays in many industrial switching applications. Internally the part combines an AlGaAs infrared LED with a monolithically integrated photovoltaic diode array and a switching MOSFET that provides active pull-down for fast turn-off. The novel photovoltaic generator construction allows the output stage to sit at a completely floating potential relative to the input, which is the property that makes the part useful as a high-side driver or as a floating bias source. Typical applications include solid-state relay (SSR) front-ends, high-side MOSFET/IGBT gate drive, industrial controls, load distribution, current-to-voltage conversion, and custom solid-state relay assemblies where galvanic isolation between low-voltage logic and a switched mains or bus rail is required. When designing with this part, account for the very low output current capability (microampere range). The PVI is intended to charge a MOSFET gate to threshold, not to deliver sustained load current; for anything beyond gate-charge drive, buffer the output with a discrete driver stage. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, giving engineers a single reference for evaluation and supply-chain planning.
TLP127(TPL,U,F) - 2500Vrms Darlington Optocoupler SO6 | Toshiba
The Toshiba TLP127(TPL,U,F) is a single-channel Darlington-output optocoupler housed in a 4-pin MFSOP6 (Mini-Flat SO6) surface-mount package, providing 2500 Vrms galvanic isolation between a GaAs infrared LED input and a silicon photodarlington output. The device delivers a minimum current transfer ratio (CTR) of 1000 % at IF=10 mA / VCE=2 V and supports a collector-emitter voltage of 300 V, a collector current of 150 mA, and a peak collector surge of 150 mA, making it well suited for programmable controller DC-output modules and telecommunication line interfaces. An optocoupler (also called an optoisolator or photocoupler) is a semiconductor device that transmits an electrical signal between two isolated circuits by using an internal LED-phototransistor optical link. The optocoupler category sits inside the broader optoisolator family, which in turn belongs to the signal-conditioning and isolation segment of the power management and interface IC tree. Darlington-output variants such as the TLP127 use a cascaded phototransistor pair to multiply the photo-induced base current, producing very high CTR and eliminating the need for an external driver stage in low-current interfaces. Key specifications include an isolation voltage of 2500 Vrms, a maximum collector-emitter voltage VCEO of 300 V, an on-state collector current of up to 150 mA, a forward voltage of 1.15 V at IF=10 mA, and a saturation voltage of 1.2 V at IC=100 mA. Switching characteristics are 15 us turn-on and 40 us turn-off measured at IF=10 mA, RL=100 ohm, which is acceptable for relay drivers and DC-output modules where sub-millisecond response is sufficient. The Darlington architecture combines two bipolar transistors on the receiver die, giving the TLP127 roughly 100x the current gain of a standard phototransistor optocoupler. This lets a 5 mA LED current drive a relay coil that would otherwise require a separate pre-driver, simplifying the BOM. The wide VCEO of 300 V also makes the part useful for 24 V and 48 V industrial buses, and the 2500 Vrms isolation meets IEC 60747-5-5 reinforced insulation requirements for industrial control equipment. Typical applications include programmable controller DC-output modules, telecommunication line interfaces, solid-state relay drivers, interface modules for measurement equipment, and battery-monitoring isolation in industrial automation. The combination of high CTR and high VCEO enables direct switching of 24 V relays without an external transistor, reducing board area. When designing with the TLP127, place the input-side current-limiting resistor to set IF between 5 mA and 20 mA and use a flyback diode across inductive loads. The 4-pin SO6 footprint is smaller than a DIP-6 optocoupler, so PCB layout must respect the minimum 5 mm creepage to preserve the rated isolation voltage. This page synthesizes distributor pricing, drop-in pin-compatible alternatives, and practical design guidance not collected in the Toshiba datasheet PDF, helping engineers select and qualify the TLP127(TPL,U,F) for new designs and second-source replacements.
TLP182(GR-TPL,E - AC Input Phototransistor Optocoupler, 3750Vrms | Toshiba
The Toshiba TLP182(GR-TPL,E is a low AC-input photocoupler consisting of a phototransistor optically coupled to two antiparallel InGaAs infrared emitting diodes, housed in a 6-pin SO6 (4-lead) surface-mount package. The device features a guaranteed 3750 Vrms isolation voltage, a collector-emitter breakdown voltage of 80 V minimum, and an operating temperature range of -55C to +125C, making it suitable for high-density industrial designs. The (GR) suffix denotes the Current Transfer Ratio (CTR) rank of 100% to 300% at IF = 5 mA and VCE = 5 V, while (TPL,E) specifies L-direction tape-and-reel packaging and RoHS compliance. A photocoupler (also called an optocoupler or opto-isolator) is a semiconductor device that transmits electrical signals between two isolated circuits using light. The category hierarchy is optocoupler > isolator > signal conditioning IC > semiconductor. Phototransistor-output optocouplers provide galvanic isolation while preserving analog or digital signal integrity, and are widely used to protect low-voltage logic from high-voltage transients on industrial buses, motor drives, and switching power supply feedback paths. The TLP182's antiparallel LED configuration enables direct AC input operation without polarity constraints, simplifying half-wave and full-wave rectified control interfaces. Key features of the TLP182 include 3750 Vrms isolation voltage, 50% minimum CTR at low IF = +/-0.5 mA (enabling high-efficiency LED drive), 80 V VCEO, and wide -55C to +125C operating range. The 4-lead SO6 package measures approximately 3.7 mm x 7.0 mm x 2.1 mm, providing high isolation in a compact footprint suitable for dense PCB layouts. The InGaAs infrared LED delivers faster switching characteristics compared with traditional GaAs emitters, supporting higher data rates in digital isolation applications. The TLP182 uses a double-molded optical coupling path between the input LED stack and the output phototransistor, achieving reinforced insulation per industry standards. The antiparallel LED arrangement means the device conducts on either half-cycle of an AC input, eliminating the need for a rectifier bridge in low-frequency AC sensing circuits. The SO6 package provides 5.0 mm minimum external creepage and clearance distances, supporting 250 V working voltage per IEC 60747-5-5. Typical applications include programmable logic controller (PLC) I/O modules, switching power supply feedback loops, AC line voltage sensing interfaces, communication interface isolation, hybrid IC signal transfer, and industrial control input modules. The wide temperature range and high CTR at low current make the TLP182 particularly well-suited for energy-efficient designs where LED drive current must be minimized. When designing with the TLP182, observe proper creepage and clearance distances on the PCB and ensure input-side current-limiting resistors match the chosen IF (typically 5-20 mA). The base pin is internally connected only on selected variants - on the standard TLP182 the base is left open, and external bias should not be applied unless confirmed against the specific datasheet variant. Always derate CTR at elevated temperatures per the datasheet curves. This page synthesizes distributor pricing, verified drop-in alternatives from Toshiba and competitor optocouplers, and practical design guidance not collected on any single manufacturer or distributor page.
TLP182GB-TPL.E - 3750Vrms AC-Input Phototransistor Optocoupler | Toshiba
The Toshiba TLP182GB-TPL.E is a 4-pin SO6 phototransistor-output optocoupler with 3750 Vrms isolation voltage, AC input capability, and an operating temperature range of -55°C to +125°C. The device consists of two antiparallel infrared LEDs optically coupled to a phototransistor, enabling direct AC-input drive without external rectification. Housed in a compact 6-SOP package (4 effective pins plus 2 NC), it targets high-density surface-mount applications where board real estate and isolation are critical. The GB-TPL.E suffix defines tape-and-reel packaging with a 125°C upper temperature rating. A photocoupler (also called an optoisolator) is a semiconductor device that transmits electrical signals between two isolated circuits using infrared light. Phototransistor-output optocouplers sit within the broader optocoupler family (which also includes triac, MOSFET, and Darlington outputs) and are commonly used for digital signal isolation in industrial control, switch-mode power supply feedback, and communication interfaces. The TLP182's AC-input design—achieved by antiparallel LED orientation—eliminates the need for input rectification, simplifying drive circuitry and reducing BOM count in PLC and AC-line-sensing applications. Key specifications include 3750 Vrms isolation voltage (per UL/VDE standards), 50 mA collector current maximum, 80 V collector-emitter voltage, and a current transfer ratio (CTR) characteristic that varies with part grade. The TLP182 is supplied in seven CTR grades (e.g., GB rank denoting 100% to 600% CTR), allowing designers to optimize sensitivity and switching speed for specific load conditions. The wide -55°C to +125°C operating range supports harsh-environment deployment. Architecturally, the TLP182 integrates a high-emitter-efficiency GaAlAs or GaAs LED pair with a silicon phototransistor receiver, isolated by a transparent silicone dielectric. The antiparallel LED arrangement accepts either polarity of AC input, while the phototransistor collector remains accessible as a single-ended output, simplifying biasing with a pull-up resistor to VCC. Typical applications include programmable logic controller (PLC) digital input modules, switching-mode power supply feedback loops, communication interface isolation, AC line-voltage sensing, and hybrid IC interface boards. The SO6 footprint suits high-density SMT assembly and reflow soldering. When designing with the TLP182, place a base-emitter resistor (typically 1-10 MΩ) across the phototransistor to reduce off-state leakage and improve switching speed. Ensure that the input LED drive current respects the absolute maximum ratings and that the supply voltage at the collector does not exceed VCEO. For switching-speed-sensitive designs, use a smaller pull-up resistor to accelerate the output rise time. This page synthesizes distributor pricing, drop-in alternatives, and practical design considerations not consolidated in the manufacturer datasheet alone.