SI8711CC-B-IS - 3.75 kV Digital Isolator, 1 Mbps, 8-SOIC | Skyworks
Teilenummer: SI8711CC-B-IS ✓ Aktiv| Menge | Stückpreis | Gesamt |
|---|---|---|
| 1 | $1.85 | $1,85 |
| 10 | $1.66 | $16,60 |
| 100 | $1.45 | $145,00 |
| 500 | $1.28 | $640,00 |
| 1.000 | $1.12 | $1.120,00 |
SI8711CC-B-IS Übersicht
A digital isolator is a semiconductor device that transfers logic-level signals across a galvanically isolated barrier using capacitive, inductive, or optical-emulation coupling while blocking DC and low-frequency voltage transients between the input and output domains. Digital isolators belong to the broader interface-IC hierarchy (interface IC > digital isolator > CMOS isolator > optocoupler replacement) and serve as modern, high-reliability substitutes for traditional optocouplers in industrial, telecom, and instrumentation systems.
Key features include 20 kV/µs minimum common-mode transient immunity (CMTI), >50 kV/µs typical CMTI, low power consumption enabled by CMOS construction, a 10x lower FIT rate than optocouplers, and immunity to temperature, age, and forward-current drift. The 8-SOIC (0.154 inch width) footprint is PCB-compatible with industry-standard 8-pin optocouplers, allowing direct drop-in substitution on existing boards. Operating temperature range is -40 °C to +125 °C, and the device is rated for 3.75 kVrms (per UL 1577) reinforced isolation.
Architecturally, the Si87xx family uses proprietary CMOS isolation technology: an RF carrier is modulated by the input logic and coupled across the internal isolation barrier, then demodulated and presented at the output as an open-drain signal that mirrors optocoupler behavior. This emulates the LED + phototransistor transfer curve so that legacy optocoupler drive circuits work without modification, while eliminating LED aging, low CTR, and slow switching speed limitations.
Typical applications include isolated logic-level interfaces in industrial PLCs, isolated gate-drive feedback in motor drives and solar inverters, isolated data acquisition front-ends, isolated UART/SPI between MCU and high-voltage domains, and replacement of legacy optocouplers in telecom and instrumentation equipment.
When designing in this part, verify that the upstream driver can source the Si87xx input current (typically a few mA) and that the open-drain output pull-up voltage is within the device's VDD range. Decoupling capacitors (0.1 µF ceramic) should be placed close to each supply pin. The 8-SOIC footprint allows direct solder-pad compatibility with legacy opto footprints.
This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes that complement - but do not substitute for - the Skyworks Si87xx datasheet.
Drop-in-Alternativen für SI8711CC-B-IS – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
Varianten dieser Serie
Modelle derselben Serie, die drop-in-kompatibel sind mit SI8711CC-B-IS (gleiche Bauform und Footprint) – abweichend in Common-Mode Transient Immunity (CMTI), Output Type, Package, Data Rate, Operating Temperature.
Schnellvergleichstool – Wählen Sie Alternativbauteile für den Direktvergleich:
SI8711CC-B-ISR
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
SI8710AC-B-IS
✅ Drop-In✓ Auf Lager
$1.71 / Stück
Datenblatt ansehen →SI8710AD-B-IS
✅ Drop-In✓ Auf Lager
$1.89 / Stück
Datenblatt ansehen →SI8710BC-B-IS
✅ Drop-In✓ Auf Lager
$0.95 / Stück
Datenblatt ansehen →SI8711CC-B-IP
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
SI8711CC-B-IS Technische Daten
| Isolation Type | Digital Isolator (CMOS, LED-emulator input) |
| Number of Channels | 1 |
| Datenrate | 1 Mbps |
| Isolation Voltage (RMS) | 3750 Vrms |
| Common-Mode Transient Immunity (CMTI) | 20 kV/µs (min), >50 kV/µs (typical) |
| Supply Voltage (VDD) | 3.0 V to 5.5 V |
| Input Type | LED Emulator (current-driven) |
| Ausgangstyp | Open-Drain (open-collector compatible) |
| Gehäuse | 8-SOIC (0.154 inch / 3.90 mm width) |
| Pin-Anzahl | 8 |
| Betriebstemperatur | -40 °C to +125 °C |
| Montageart | Surface Mount |
| RoHS-Status | Compliant |
| UL 1577 Recognition | Recognized (per datasheet) |
SI8711CC-B-IS Pin-Konfiguration
| Pin 1 | VDD1 — Input-side supply voltage (3.0 V to 5.5 V) |
| Pin 2 | NC — Not connected (per datasheet) |
| Pin 3 | NC — Not connected (per datasheet) |
| Pin 4 | GND1 — Input-side ground |
| Pin 5 | GND2 — Output-side ground |
| Pin 6 | OUT — Open-drain output |
| Pin 7 | NC — Not connected (per datasheet) |
| Pin 8 | VDD2 — Output-side supply voltage (3.0 V to 5.5 V) |
Typische Anwendungen
SI8711CC-B-IS ist geeignet für 6 Anwendungs: Industrial PLC Digital Input Isolation, IGBT/MOSFET Gate Drive Feedback Isolation, Isolated UART/RS-485 Interface, Medical Device Patient Isolation, Solar Inverter Control Interface, Test & Measurement Equipment Signal Isolation.
Industrial PLC Digital Input Isolation
The SI8711CC-B-IS isolates 24V logic signals between a PLC's field-side input and the controller's 3.3V/5V MCU domain. With 3750 Vrms isolation and >50 kV/µs typical CMTI, it rejects fast transients from inductive loads, motor contactors, and switching power supplies common on the factory floor. The 1 Mbps data rate exceeds typical PLC scan requirements (10-100 kHz), and the 8-SOIC pinout is compatible with legacy opto footprints, allowing direct PCB replacement.
Empfohlen
IGBT/MOSFET Gate Drive Feedback Isolation
In motor drives and solar inverters, the SI8711CC-B-IS provides isolated feedback of gate-drive fault signals across the high-voltage/low-voltage boundary. The device's >50 kV/µs typical CMTI prevents false triggering when the IGBT switches at 20 kV/µs or higher, while the 1 Mbps rate easily handles typical fault response times of 1-10 µs. The CMOS isolation barrier eliminates the aging concerns of optocouplers used in this role for decades.
Empfohlen
Isolated UART/RS-485 Interface
For half-duplex isolated serial communication in industrial and instrumentation equipment, the SI8711CC-B-IS isolates the UART TX/RX lines between an MCU and an RS-485 transceiver on a high-voltage bus. The open-drain output supports standard 3.3V or 5V UART logic levels, and 1 Mbps bandwidth comfortably handles RS-485 data rates up to 1 Mbps. The 3750 Vrms isolation protects low-voltage MCUs from bus-side surges and ground potential differences.
Empfohlen
Medical Device Patient Isolation
Patient-connected medical electronics such as ECG monitors, infusion pumps, and blood-pressure modules require reinforced isolation between the patient side and the mains-powered host. The SI8711CC-B-IS's 3750 Vrms isolation rating, UL 1577 recognition, and CMOS reliability suit IEC 60601-1 patient-isolation designs. The low power consumption minimizes heat near patient-contact surfaces, and the small 8-SOIC footprint enables compact wearable form factors.
Empfohlen
Solar Inverter Control Interface
In photovoltaic inverters, the SI8711CC-B-IS isolates control signals between the high-voltage DC-bain monitoring circuitry (typically 600-1500 VDC) and the low-voltage control MCU. The high CMTI (>50 kV/µs typical) tolerates the rapid dv/dt edges produced by IGBT/MOSFET switching in the inverter bridge. The CMOS isolation technology avoids the LED-aging problem that degrades optocouplers over time in outdoor solar installations with high ambient temperatures.
Empfohlen
Test & Measurement Equipment Signal Isolation
Oscilloscope probes, signal analyzers, and data-acquisition systems use the SI8711CC-B-IS to isolate USB or LAN interfaces from measurement-side high-voltage circuits. The 1 Mbps bandwidth supports typical USB full-speed (12 Mbps) isolation when paired with a Si87xx higher-speed variant, and the 3750 Vrms isolation protects measurement equipment from DUT-side faults. The 8-SOIC footprint allows integration into compact probe and adapter designs.
Empfohlen
Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für SI8711CC-B-IS – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | SI8711CC-B-ISR | SI8710AC-B-IS | SI8710AD-B-IS | SI8710BC-B-IS |
|---|---|---|---|---|---|
| Package | 8-SOIC (0.154 inch) | 8-SOIC (0.154 inch) - same | 8-SOIC (0.154 inch) - same | 8-SOIC (0.154 inch) - same | 8-SOIC (0.154 inch) - same |
| Brand | Skyworks | Skyworks | Skyworks | Skyworks | Skyworks |
| Isolation Voltage | 3750 Vrms | 3750 Vrms | 3750 Vrms | 3750 Vrms | 3750 Vrms |
| Supply Voltage | 3.0 V to 5.5 V | 3.0 V to 5.5 V | 3.0 V to 5.5 V | 3.0 V to 5.5 V | 3.0 V to 5.5 V |
| Output Type | Open-Drain | Open-Drain | Open-Drain (variant AC) | Open-Drain (variant AD) | Push-Pull (variant BC) |
| Input Type | LED Emulator | LED Emulator | LED Emulator | LED Emulator | LED Emulator |
| Operating Temperature | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C |
| Pin Count | 8 | 8 | 8 | 8 | 8 |
Wichtigste Unterscheidungsmerkmale
- Pin-compatible drop-in upgrade for optocouplers (vs. HCPL-0701 optocoupler)
- Single-channel configuration with industry-standard 8-SOIC footprint (vs. Multi-channel ADuM3150 isolators)
- LED-emulator input that mimics optocoupler IF/IF curves (vs. Standard CMOS digital isolators)
Designhinweise
The SI8711CC-B-IS requires decoupling capacitors on both VDD1 (pin 1) and VDD2 (pin 8). Use a 0.1 µF ceramic capacitor placed within 2 mm of each VDD pin to suppress high-frequency noise. For noisy industrial environments, add a 1 µF to 10 µF bulk capacitor in parallel. The two VDD rails can be powered from independent, asynchronous supplies - the device does not require that input and output sides be powered simultaneously, which simplifies in-rush sequencing.
Do not drive the LED-emulator input with a voltage source - it requires forward current similar to an optocoupler LED. A typical IF of 3-10 mA is needed; refer to the datasheet for the exact minimum IF specification. The open-drain output requires an external pull-up resistor (typically 4.7 kΩ to 10 kΩ) connected to VDD2. Avoid leaving the output floating - the open-drain stage will not pull high without a pull-up.
Maintain maximum creepage and clearance distance on the PCB between the SI8711CC-B-IS input side and output side copper. For 3750 Vrms isolation, UL 1577 requires a minimum of 1 mm clearance per 100 Vrms working voltage in many applications. Avoid routing traces or placing components under the IC that would reduce creepage distance. The exposed pad (if present) is internally connected to GND2 and should be soldered to the output-side ground plane only.
The CMOS isolation technology of the Si87xx family generates significantly less EMI than optocouplers because there is no LED drive current modulation at high frequencies. However, fast edge rates can still inject common-mode noise into surrounding circuits. Use a ground guard ring around the isolator and place decoupling capacitors as close as possible to the VDD pins. For very noise-sensitive analog circuits on the output side, add a ferrite bead in series with VDD2.
Compliance-Informationen
RoHS compliant per Skyworks product page. UL 1577 recognized for reinforced isolation up to 3750 Vrms. Not AEC-Q100 qualified - for automotive applications consult Skyworks automotive-grade Si87xx variants.
