FDA217STR - Dual Photovoltaic MOSFET Driver | IXYS | Isolated Gate Driver
N.º de pieza: FDA217STR ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $2.85 | $2,85 |
| 10 | $2.52 | $25,20 |
| 100 | $2.18 | $218,00 |
| 500 | $1.89 | $945,00 |
| 1.000 | $1.65 | $1.650,00 |
FDA217STR Descripción general
An optocoupler, or optical isolator, is a semiconductor device that transmits an electrical signal across a galvanically-isolated barrier using infrared light, providing high-voltage isolation between input and output while allowing signal or power transfer. Photovoltaic MOSFET drivers are a specialized optocoupler class used as solid-state replacements for electromechanical relays and pulse transformers in gate-drive circuits. The FDA217STR belongs to the broader family of gate-driver optocouplers -> isolators -> power management ICs -> semiconductors.
Key features include dual independent channels in a single package, eliminating the need for two single-channel optocouplers. The integrated turn-off MOSFET on each channel discharges the gate-source capacitance when LED current is removed, allowing reliable switching of normally-on devices or circuits that require negative turn-off bias. The device requires no external supply voltage on the output side, deriving all gate-drive energy directly from the LED input.
Architecturally, the FDA217STR pairs a high-efficiency GaAs infrared emitting diode on the input side with two series-connected photodiode arrays on the output side. Each photodiode array functions as a miniature solar cell, generating approximately 7-8 V open-circuit and sufficient short-circuit current to charge a typical power-MOSFET gate in milliseconds. The integrated turn-off transistor provides a path to discharge the gate capacitance symmetrically.
Typical applications include solid-state relay (SSR) replacements, isolated IGBT/MOSFET gate drivers in motor control, photovoltaic isolators for medical equipment, telecom line-interface isolation, and floating power-supply startup circuits. The dual-channel package particularly suits half-bridge or full-bridge topologies where two isolated drive channels are required.
When designing with the FDA217STR, observe the LED forward-current recommendation (typically 5-10 mA for full output swing) and verify that the MOSFET total gate charge does not exceed the photodiode array's source-current capability. For high-frequency switching, an external buffer stage may be needed to source additional gate current beyond what the photovoltaic output can deliver alone.
This page synthesizes Littelfuse/IXYS datasheet data, distributor pricing, and drop-in equivalents to give engineers a single reference not found on distributor or manufacturer product pages alone.
Alternativas directas para FDA217STR — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
FDA217S
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
FDA217
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
CPC1966
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
VOM1271
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
CPC1976Y
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
FDA217STR Valores máximos y características eléctricas
| Product Type | Dual Photovoltaic MOSFET Gate Driver Optocoupler |
| Number of Channels | 2 |
| Isolation Voltage | 3750 Vrms |
| Configuración de salida | Photovoltaic (floating voltage source) |
| Integrated Turn-off Circuit | Yes (per channel) |
| Encapsulado | 8-SMD (SOIC-8 compatible footprint) |
| Tipo de montaje | Surface Mount |
| Temperatura de funcionamiento | -40C to +85C |
| Estado RoHS | Compliant |
| Reach Status | Compliant |
Configuración de pines de FDA217STR
| Pin 1 | LED Anode (+) — LED input - anode (IF forward current input) |
| Pin 2 | LED Cathode (-) — LED input - cathode |
| Pin 3 | NC — Not connected (per datasheet) |
| Pin 4 | Vout1- — Channel 1 photovoltaic output negative terminal |
| Pin 5 | Vout1+ — Channel 1 photovoltaic output positive terminal |
| Pin 6 | Vout2- — Channel 2 photovoltaic output negative terminal |
| Pin 7 | Vout2+ — Channel 2 photovoltaic output positive terminal |
| Pin 8 | NC — Not connected (per datasheet) |
Aplicaciones típicas
FDA217STR es adecuado para 6 aplicacións: Solid-State Relay (SSR) Replacement, Isolated IGBT/MOSFET Gate Driver, Medical Equipment Patient Isolation, Telecom Line-Interface Isolation, Floating Power-Supply Startup Circuit, Industrial Process Control Isolation.
Solid-State Relay (SSR) Replacement
The FDA217STR's dual photovoltaic output and 3750 Vrms isolation make it ideal for solid-state relay replacement designs where mechanical relay reliability is insufficient. The photodiode array directly drives the gate of two back-to-back MOSFETs or a single MOSFET output stage, providing zero-crossing or random-fire switching without a secondary-side supply rail. Its integrated turn-off transistor discharges the MOSFET gate when the LED input is extinguished, eliminating external pull-down components. With 3750 Vrms isolation, the FDA217STR supports 230 VAC line switching in industrial control panels. Compared to electromechanical relays, the FDA217STR offers 100x longer operational life, silent switching, and immunity to contact bounce.
Recomendado
Isolated IGBT/MOSFET Gate Driver
The FDA217STR provides isolated gate drive for low-to-medium frequency IGBT and power MOSFET switching applications, where its floating photovoltaic output replaces a bulky isolated DC-DC converter plus gate-drive transformer topology. Each channel's photodiode array generates approximately 7-8 V open-circuit voltage - sufficient to switch standard-threshold MOSFETs and many IGBTs directly. With 2 channels in one 8-SMD package, the FDA217STR is well-suited for half-bridge gate drive where the high-side and low-side switches both need isolation. For switching frequencies above a few kHz, an external buffer stage is recommended because the photodiode array's source current limits dV/dt capability.
Recomendado
Medical Equipment Patient Isolation
In medical electronics, the FDA217STR provides reinforced isolation between patient-connected circuitry and the mains-powered control domain, supporting IEC 60601-1 patient-protection requirements at the system level. The optocoupler's 3750 Vrms isolation barrier protects patients from hazardous leakage currents while allowing low-power signal and gate-drive transfer. Typical applications include isolated switching for patient monitors, infusion pump control, and isolation in diagnostic imaging equipment. The FDA217STR's small 8-SMD footprint saves PCB area versus discrete optocoupler-plus-transformer solutions. Note: the FDA217STR itself is not a certified medical component - the integrator must perform end-system IEC 60601-1 compliance testing.
Recomendado
Telecom Line-Interface Isolation
The FDA217STR provides isolation in telecom line-interface circuits, particularly for floating battery-backed power domains, ringing-signal switching, and on-hook/off-hook relay replacement. Its 3750 Vrms isolation barrier handles telecom-line transient surges while the dual photovoltaic output drives MOSFET gates in solid-state line-interface designs. The integrated turn-off transistor ensures clean MOSFET turn-off in line-switching circuits where residual gate charge could otherwise cause cross-conduction. With dual channels, the FDA217STR can drive both the tip and ring line switches from a single 8-SMD package, reducing PCB area versus two single-channel optocouplers.
Recomendado
Floating Power-Supply Startup Circuit
The FDA217STR serves as the isolated trigger source for floating power-supply startup circuits, where a low-voltage control signal must initiate operation of a high-voltage floating supply without direct electrical connection. The photodiode array charges a bootstrap capacitor that subsequently powers the main switching converter, eliminating the auxiliary winding or external isolated DC-DC supply needed for conventional designs. The integrated turn-off transistor ensures the bootstrap capacitor discharges predictably when the LED is extinguished. This topology is widely used in solid-state relay modules, isolated gate drivers, and high-side current-sense systems where 3750 Vrms isolation must be maintained.
Recomendado
Industrial Process Control Isolation
The FDA217STR is widely deployed in industrial process control systems for isolating PLC outputs from field-side actuators, replacing electromechanical relays with silent, long-life solid-state switching. The 3750 Vrms isolation rating easily handles 24 VDC and 48 VDC field wiring transients, and the dual channels per package reduce BOM cost in multi-output PLC modules. Industrial designers value the FDA217STR for its tolerance to vibration, temperature extremes (-40C to +85C operating range), and humidity - all failure modes for mechanical relays. The integrated turn-off transistor eliminates the external discharge resistor typically needed with single-channel photovoltaic drivers.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para FDA217STR — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | FDA217S | FDA217 | CPC1966 | VOM1271 | CPC1976Y |
|---|---|---|---|---|---|---|
| Package | 8-SMD (SOIC-8) | 8-SMD (SOIC-8) - same | 8-SMD (SOIC-8) - same | 8-SMD (SOIC-8) - same | 8-SMD (SOIC-8) - same | 8-SMD (SOIC-8) - same |
| Brand | IXYS (Littelfuse) | IXYS (Littelfuse) | IXYS (Littelfuse) | IXYS (Littelfuse) | Vishay Intertechnology | IXYS (Littelfuse) |
| Number of Channels | 2 | 2 | 2 | 1 | 1 | 1 |
| Isolation Voltage | 3750 Vrms | 3750 Vrms | 3750 Vrms | 3750 Vrms | 3750 Vrms | 3750 Vrms |
| Integrated Turn-off Circuit | Yes (per channel) | Yes (per channel) | Yes (per channel) | Yes | No (external required) | Yes (integrated SSR) |
| Output Function | Photovoltaic gate drive | Photovoltaic gate drive | Photovoltaic gate drive | Photovoltaic gate drive | Photovoltaic gate drive | AC/DC load switching (SSR) |
| Secondary Supply Required | No | No | No | No | No | No |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
| RoHS Compliance | Compliant | Compliant | Compliant | Compliant | Compliant | Compliant |
Diferenciadores clave
- Dual independent photovoltaic channels in a single 8-SMD package (frente a CPC1966)
- Integrated turn-off transistor on each channel (frente a VOM1271)
- Floating photovoltaic output requires no secondary-side supply (frente a CPC1976Y)
Notas de diseño
The FDA217STR photovoltaic output is current-limited - each channel sources only a few microamps of short-circuit current. When driving a power MOSFET with high total gate charge (Qg > 50 nC), turn-on time will be slow (milliseconds). For fast switching, add a discrete buffer stage (e.g. a BJT emitter follower) between the photovoltaic output and the MOSFET gate. The integrated turn-off transistor discharges the gate when the LED is extinguished, but it cannot actively source current to overcome Miller-induced gate currents during turn-off transitions.
Maintain at least 6.5 mm creepage distance between the LED side (pins 1-2) and the photovoltaic output side (pins 4-7) to preserve the 3750 Vrms isolation rating in a polluted environment. The FDA248 datasheet package drawing specifies the body width that determines this creepage distance. Do not place any PCB traces, vias, or component pads under the optocoupler body that bridge the isolation barrier. Use a slot in the PCB if the application requires extended creepage beyond the package geometry.
The FDA217STR is rated for -40C to +85C operating temperature. In high-temperature environments (industrial process control, automotive under-hood), derate LED forward current if the case temperature exceeds 70C. The 8-SMD package has a thermal resistance of [DATA_NEEDED: theta_JA value] C/W. Provide adequate PCB copper area for heat spreading. The internal infrared LED's optical output degrades slowly with temperature and operating time - design with 20% LED current margin to maintain photovoltaic output over the part's lifetime.
Do not apply reverse voltage to the photovoltaic output - the integrated turn-off transistor can be damaged. Do not exceed the maximum LED forward current (typically 20 mA) - excessive IF reduces opto-coupler CTR lifetime. Do not assume the photovoltaic output can source significant DC current - it is designed for MOSFET gate charging only. When the application requires a continuous DC output rather than pulsed gate drive, an external storage capacitor and buffer circuit are required.
Información de cumplimiento
RoHS and REACH compliant per IXYS/Littelfuse product page. Not AEC-Q100 qualified - this part targets industrial, medical, and telecom applications, not automotive. Halogen-free status not stated in available data.
