SI8710AC-B-IS - 3.75kV Digital Isolator, 1-Ch, 15Mbps | Skyworks
N.º de pieza: SI8710AC-B-IS ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $2.71 | $2,71 |
| 10 | $2.45 | $24,50 |
| 100 | $2.18 | $218,00 |
| 500 | $1.92 | $960,00 |
| 1.000 | $1.71 | $1.710,00 |
SI8710AC-B-IS Descripción general
A digital isolator is a semiconductor device that transfers logic-level signals across an isolation barrier using a non-electrical coupling mechanism (capacitive, inductive, or optical), while providing galvanic isolation between grounds. In the system hierarchy, digital isolators sit above simple logic isolators and below fully integrated isolated gate drivers and isolated ADCs. They are essential whenever a logic signal must cross a safety barrier such as an IEC 61800 / IEC 60950 reinforced insulation boundary, or when ground-potential differences between subsystems would otherwise create ground loops or fault paths.
Key differentiating specifications include a 60 ns typical propagation delay, 20 kV/us minimum CMTI per datasheet, 3 V to 30 V wide supply voltage range on the output side, and an open-drain (open-collector) output stage that emulates the phototransistor of a traditional optocoupler. The CMOS isolation technology eliminates the LED aging and forward-current drift that plagues optocouplers, providing a 10x lower FIT rate and stable propagation delay across the full -40C to +125C automotive temperature range.
Architecturally, the Si87xx family uses proprietary capacitive isolation with on-chip encoding/decoding. An internal oscillator modulates the input logic state across the capacitive barrier, and a differential receiver reconstructs the original signal with deterministic timing. Unlike optocouplers, there is no LED, no current-transfer-ratio degradation, and no need for an input buffer network beyond a simple series resistor.
Typical applications include replacement of HCPL-4506/ACPL-247/PS2801 type optocouplers in industrial PLCs, gate-driver signal isolation for IGBT/MOSFET bridges in motor drives and solar inverters, isolated SPI/UART links in factory automation, isolated status feedback in switch-mode power supplies, and AEC-Q100 automotive battery-management isolation.
When designing with this part, note that the Si8710AC-B-IS uses an open-drain output that requires an external pull-up resistor (typ. 1 kohm to 10 kohm) on the output node. Designers must also provide a bypass capacitor of at least 0.1 uF close to each supply pin and keep input-side current below 10 mA per datasheet.
This page synthesizes distributor pricing, drop-in Si87xx family alternatives, and practical optocoupler-replacement design notes not consolidated in the manufacturer datasheet alone.
Alternativas directas para SI8710AC-B-IS — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con SI8710AC-B-IS (mismo factor de forma y huella) — difiere en Common-Mode Transient Immunity (CMTI), Output Type, Data Rate, Package, Input Type.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
SI8710AC-B-ISR
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
SI8710AC-B-IPR
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
SI8711AC-B-IS
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
SI8700AB-IS
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
ISO7710DR
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
ADuM1100ARZ
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
SI8710AC-B-IS Especificaciones
| Isolation Type | Digital Isolator (Capacitive Coupling) |
| Number of Channels | 1 |
| Channel Configuration | Unidirectional (one-way) |
| Velocidad de datos | 15 Mbps (maximum) |
| Isolation Voltage | 3750 Vrms |
| Common-Mode Transient Immunity (CMTI) | 20 kV/us minimum, >50 kV/us typical |
| Propagation Delay (Typ) | 60 ns |
| Tensión de alimentación de funcionamiento | 3 V to 30 V (output side) |
| Tipo de salida | Open-Drain / Open-Collector |
| Input Type | LED Emulator (current-driven) |
| Rango de temperatura de funcionamiento | -40C to +125C |
| Encapsulado | 8-SOIC (0.154", 3.90 mm width) |
| Tipo de montaje | Surface Mount |
| AEC-Q100 Qualification | Qualified (Automotive Grade) |
| Estado RoHS | Compliant |
| Technology | CMOS Capacitive Isolation |
Configuración de pines de SI8710AC-B-IS
| Pin 1 | VDD1 — Input-side supply voltage (3 V to 5.5 V) |
| Pin 2 | GND1 — Input-side ground reference |
| Pin 3 | ANODE — LED emulator anode (input current sink/source) |
| Pin 4 | CATHODE — LED emulator cathode (input current return) |
| Pin 5 | GND2 — Output-side ground reference (isolated from GND1) |
| Pin 6 | OUT — Open-drain logic output (requires external pull-up) |
| Pin 7 | VDD2 — Output-side supply voltage (3 V to 30 V) |
| Pin 8 | NC — Not connected (per datasheet) |
Aplicaciones típicas
SI8710AC-B-IS es adecuado para 6 aplicacións: Optocoupler Replacement in Industrial PLCs, IGBT/MOSFET Gate-Drive Signal Isolation in Motor Drives, Isolated SPI/UART Communication in Factory Automation, Switch-Mode Power Supply (SMPS) Feedback Isolation, Solar Inverter DC/AC Isolation, Automotive Battery Management System (BMS) Isolation.
Optocoupler Replacement in Industrial PLCs
The SI8710AC-B-IS is engineered as a pin-compatible, drop-in replacement for legacy HCPL-4506 and ACPL-247 optocouplers in industrial PLC digital-input modules. Its 3750 Vrms isolation rating exceeds the 2500 Vrms typical of optocouplers, and the 15 Mbps data rate provides 1.5x to 15x the bandwidth of phototransistor-based optos. Designers can swap opto-LED/phototransistor pairs onto existing PCB footprints without changing firmware, while gaining >50 kV/us CMTI immunity that eliminates field failures caused by long motor cables injecting fast transients into the logic ground return path.
Recomendado
IGBT/MOSFET Gate-Drive Signal Isolation in Motor Drives
In variable-frequency drives (VFDs) and servo amplifiers, the SI8710AC-B-IS provides reinforced isolation between low-voltage control logic (3.3 V MCU) and the high-side gate-drive reference of IGBT half-bridges switching at 10-20 kHz. The 60 ns propagation delay is short enough to maintain dead-time accuracy, and the 20 kV/us CMTI (50 kV/us typical) prevents false triggering when the high-side drain swings at 600-1200 V/ns. The 3-30 V output supply range accepts the standard 5 V, 12 V, and 15 V gate-drive rails.
Recomendado
Isolated SPI/UART Communication in Factory Automation
The SI8710AC-B-IS provides single-channel isolation for point-to-point SPI CS, UART TX/RX, or CAN signals across factory-floor equipment where ground-potential differences reach hundreds of volts. With 60 ns typical propagation delay, it preserves SPI clock rates up to ~10 MHz and UART baud rates up to 15 Mbps. The open-drain output mimics an optocoupler phototransistor, allowing direct interfacing with 3.3 V or 5 V microcontroller UART peripherals. Multiple SI8710s can be paralleled for full-duplex isolation of bidirectional buses.
Recomendado
Switch-Mode Power Supply (SMPS) Feedback Isolation
In isolated AC-DC and DC-DC converters, the SI8710AC-B-IS isolates the primary-side PWM controller feedback signal from the secondary-side error amplifier, breaking the ground loop between high-voltage primary and user-accessible secondary. Its 15 Mbps data rate easily accommodates opto-coupler-replacement TL431-style feedback paths operating at 100-500 kHz. The CMOS isolation eliminates the 50% CTR loss of optocouplers over 10 years of service, dramatically improving converter stability and MTBF.
Recomendado
Solar Inverter DC/AC Isolation
In photovoltaic string inverters and micro-inverters, the SI8710AC-B-IS isolates the high-voltage DC-bus side (up to 1000 VDC) from the low-voltage MPPT controller and grid-monitoring logic. The 3750 Vrms rating covers the reinforced-insulation barrier required by IEC 62109-1, while the >50 kV/us typical CMTI handles the fast dV/dt edges produced by 50 kHz SiC MOSFET switching. AEC-Q100 qualification allows the same part to be used in EV solar chargers and traction inverter auxiliary supplies.
Recomendado
Automotive Battery Management System (BMS) Isolation
The SI8710AC-B-IS is AEC-Q100 qualified and rated for -40C to +125C operation, making it ideal for isolating high-voltage battery stacks (400 V or 800 V) from low-voltage BMS master controllers in electric vehicles. Its CMOS capacitive isolation survives automotive temperature cycling without LED-aging drift, while the 15 Mbps data rate supports high-speed cell-balancing telemetry. The 8-SOIC footprint fits into space-constrained BMS slave boards placed adjacent to each cell-module tap.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para SI8710AC-B-IS — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | SI8710AC-B-ISR | SI8710AC-B-IPR | SI8711AC-B-IS | SI8700AB-IS | ISO7710DR | ADuM1100ARZ |
|---|---|---|---|---|---|---|---|
| Brand | Skyworks Solutions | Skyworks Solutions | Skyworks Solutions | Skyworks Solutions | Skyworks Solutions | Texas Instruments | Analog Devices |
| Package | 8-SOIC (3.90 mm) | 8-SOIC (3.90 mm) | 8-SOIC (3.90 mm) | 8-SOIC (3.90 mm) | 8-SOIC (3.90 mm) | 16-SOIC | 8-SOIC |
| Isolation Voltage | 3750 Vrms | 3750 Vrms | 3750 Vrms | 3750 Vrms | 2500 Vrms | 3000 Vrms | 2500 Vrms |
| Data Rate | 15 Mbps | 15 Mbps | 15 Mbps | 15 Mbps | 15 Mbps | 100 Mbps | 25 Mbps |
| CMTI (Minimum) | 20 kV/us | 20 kV/us | 20 kV/us | 20 kV/us | 10 kV/us | 25 kV/us | 25 kV/us |
| Propagation Delay (Typ) | 60 ns | 60 ns | 60 ns | 60 ns | 60 ns | 13 ns | 18 ns |
| Output Supply Voltage Range | 3 V to 30 V | 3 V to 30 V | 3 V to 30 V | 3 V to 30 V | 3 V to 30 V | 2.25 V to 5.5 V | 3 V to 5.5 V |
| Output Type | Open-Drain | Open-Drain | Open-Drain | Open-Drain | Open-Drain | Push-Pull | Push-Pull |
| AEC-Q100 Qualified | Yes | Yes | Yes | Yes | Yes | No | No |
Diferenciadores clave
- Industry-leading CMTI for fast-switching applications (frente a HCPL-4506 optocoupler)
- Wide 3 V to 30 V output supply range (frente a ISO7710DR (Texas Instruments))
- True drop-in optocoupler replacement (frente a ACPL-247 optocoupler)
Notas de diseño
Estimated: Bypass VDD1 (pin 1) and VDD2 (pin 7) with a 0.1 uF X7R ceramic capacitor placed within 3 mm of each supply pin. The Si87xx datasheet recommends a low-ESR 0.1 uF to 1 uF capacitor on each side; the Si8710 typically draws <10 mA quiescent current, so a 0402-size 0.1 uF cap is sufficient for noise decoupling. Sharing a single bypass cap across both supplies will defeat the isolation barrier.
The open-drain output (pin 6) requires an external pull-up resistor on the OUTPUT side (3 V to 30 V rail). Typical values are 1 kohm to 10 kohm, depending on the desired rise time and load current. Without a pull-up, the output will float and digital logic downstream will see indeterminate levels. Also confirm the LED-emulator input current is set between 3 mA and 10 mA per the Si87xx datasheet - lower currents reduce speed, higher currents reduce service life.
Maintain at least 8 mm of clearance between the input-side copper (pins 1-4) and the output-side copper (pins 5-7) to preserve the 3750 Vrms isolation barrier in the 8-SOIC package. Avoid running any trace or via beneath the device body that crosses from one side to the other. Place the device away from board edges and connectors to maximize creepage distance for IEC 60747-17 compliance.
Información de cumplimiento
AEC-Q100 qualified per Skyworks product page. RoHS and REACH compliant. Halogen-free per Si87xx datasheet family.
