SI8710BC-B-IS - 1-Ch 15Mbps Digital Isolator | Skyworks
MPN: SI8710BC-B-IS ✓ Hoạt độngSI8710BC-B-IS Tóm tắt
What is a digital isolator? A digital isolator is a semiconductor device that transmits logic-level signals across an isolation barrier using high-voltage capacitive or magnetic coupling rather than optical (LED + photodiode) means. Digital isolators sit within the broader power management and signal conditioning hierarchy: digital isolator -> isolation IC -> interface IC -> analog/mixed-signal semiconductor. Compared to optocouplers, CMOS-based isolators eliminate LED aging, current-transfer-ratio (CTR) degradation, and temperature-dependent gain shifts, while also consuming roughly 10x less input bias current.
Key specifications include 60 ns maximum propagation delay, 3750 Vrms withstand isolation voltage (per UL 1577 standards - see datasheet), >50 kV/us typical CMTI, and a wider 3 V to 30 V supply range that supports industrial 24 V rails. The Si87xx family is built on proprietary CMOS isolation technology that yields a 10x lower FIT rate than optocouplers, producing longer service life and immune to temperature, age, and forward-current effects that plague optical solutions.
The Si87xx architecture uses an on-chip oscillator to convert the DC input into an AC carrier, capacitively couples it across the isolation barrier, and reconstructs the logic level on the secondary side. The open-collector output stage requires a pull-up resistor (typically 4.7 kOhm to 10 kOhm) on the output side and supports logic translation across different voltage domains, a useful feature when bridging 3.3 V microcontrollers to 24 V industrial inputs.
Typical applications include PLC digital input modules, industrial fieldbus isolation (RS-485, CAN, Profibus node isolation), switching power supply feedback path isolation, and IGBT gate-drive signal isolation in motor drives. The 15 Mbps data rate is also adequate for SPI interface isolation at modest clock rates and for low-speed serial protocol bridging.
When designing with this device, note that the input is an LED emulator (not a TTL/CMOS logic input) - the datasheet specifies minimum forward current, which the engineer must respect. The output pull-up resistor value must be chosen to balance speed against power dissipation; 4.7 kOhm is a common starting point for 5 V rails.
This page synthesizes Skyworks datasheet values, distributor pricing tiers, same-brand Si87xx drop-in options, and practical design notes not found in any single manufacturer document.
Bộ thay thế dễ dàng lắp đặt cho SI8710BC-B-IS — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với SI8710BC-B-IS (cùng hình factor và footprint) — khác nhau ở Package, Common-Mode Transient Immunity (CMTI), Data Rate, Output Type, Number of Channels.
SI8710AD-B-IS
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →SI8710AC-B-IS
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →SI8662BD-B-IS
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →SI8660BB-B-IS1
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →SI8641BD-B-ISR
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →SI8640BD-B-IS
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ADuM1100ARZ
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
SI8710BC-B-IS Thông số kỹ thuật
| Chức năng | Single-channel digital isolator (LED emulator input, open-collector output) |
| Number of Channels | 1 |
| Tốc độ dữ liệu | 15 Mbps (maximum) |
| Propagation Delay | 60 ns (maximum) |
| Isolation Voltage | 3750 Vrms |
| Common-Mode Transient Immunity (CMTI) | 35 kV/us (minimum), >50 kV/us (typical) |
| Supply Voltage (VDD) | 3 V to 30 V |
| Input Type | LED emulator (current-driven) |
| Kiểu đầu ra | Open-collector |
| Hộp | 8-SOIC (0.154 inch, 3.90 mm width) |
| Kiểu lắp đặt | Surface Mount |
| Nhiệt độ hoạt động | -40C to +125C |
| Inputs - Side 1 / Side 2 | 1 / 0 |
| Technology | CMOS capacitive isolation |
| Trạng thái RoHS | Compliant |
Cấu hình chân SI8710BC-B-IS
| Chân 1 | VDD1 — Input-side supply voltage (3 V to 30 V) |
| Chân 2 | ANODE — LED-emulator anode; current input |
| Chân 3 | CATHODE — LED-emulator cathode; current return |
| Chân 4 | GND1 — Input-side ground |
| Chân 5 | GND2 — Output-side ground (isolated from GND1) |
| Chân 6 | OUT — Open-collector output; requires external pull-up |
| Chân 7 | VRL — Pull-up reference voltage (connect to VDD2 or logic rail) |
| Chân 8 | VDD2 — Output-side supply voltage (3 V to 30 V) |
Ứng dụng tiêu biểu
SI8710BC-B-IS phù hợp cho 7 Áp dụngs: PLC Digital Input Module Isolation, Industrial Fieldbus Node Isolation (RS-485 / CAN / Profibus), Switching Power Supply Feedback Path Isolation, IGBT Gate-Drive Signal Isolation (Low-Side), Test and Measurement Equipment Isolation, Medical Device Signal Isolation (Patient-Monitoring Side), Solar Inverter Communication Interface Isolation.
PLC Digital Input Module Isolation
The SI8710BC-B-IS fits 24 V PLC digital input modules because its 3 V to 30 V supply range accepts the field-side voltage rail directly, while its 3750 Vrms isolation barrier protects the backplane microcontroller from field-side transients. The 15 Mbps data rate exceeds the bandwidth needed for input-scan refresh rates (typically 1 kHz per channel). Its 35 kV/us minimum CMTI ensures the module does not false-trigger when adjacent outputs switch inductive loads in the same panel.
Được đề xuất
Industrial Fieldbus Node Isolation (RS-485 / CAN / Profibus)
For RS-485 transceiver isolation in industrial nodes, the SI8710BC-B-IS provides the required 3750 Vrms galvanic isolation between the bus transceiver and the host microcontroller, while the 15 Mbps ceiling covers Profibus DP and high-speed CAN-FD signal paths. The LED-emulator input draws minimal bias current and the open-collector output integrates cleanly with standard transceiver DE/RE pins (with external pull-up).
Được đề xuất
Switching Power Supply Feedback Path Isolation
In isolated AC-DC and DC-DC converters, the SI8710BC-B-IS isolates the primary-side PWM controller's feedback path from the secondary-side error amplifier, breaking the ground loop while preserving the 3.75 kVrms safety barrier. The 60 ns propagation delay is acceptable for sub-MHz primary-side regulation loops; the 3 V to 30 V supply span lets the secondary side run directly off the converter output rail without an extra LDO.
Được đề xuất
IGBT Gate-Drive Signal Isolation (Low-Side)
For low-side IGBT/MOSFET gate drivers in motor control or induction-heating inverters, the SI8710BC-B-IS provides the required dV/dt immunity (35 kV/us minimum CMTI) to keep the control signal intact during switching transients. The open-collector output pairs with common gate-drive IC inputs (with an external pull-up) and the 8-SOIC footprint saves board space compared to optocoupler-based gate-drive designs.
Được đề xuất
Test and Measurement Equipment Isolation
Bench instruments (oscilloscope front ends, data-acquisition modules, spectrum analyzer IF stages) require analog/digital isolation that does not distort measurements. The SI8710BC-B-IS provides trigger and handshake signal isolation across the 3.75 kVrms barrier with 15 Mbps bandwidth, suitable for inter-board digital handshakes in modular instruments. Its wide 3 V to 30 V supply supports direct bus-rail powering inside the chassis.
Được đề xuất
Medical Device Signal Isolation (Patient-Monitoring Side)
In patient-monitoring equipment the SI8710BC-B-IS provides an isolation barrier that meets IEC 60601-1 patient-protection requirements when the surrounding system design satisfies creepage and clearance rules. Its 3.75 kVrms isolation withstand, 35 kV/us CMTI, and -40C to +125C operating range make it suitable for ECG, pulse-oximeter, and infusion-pump signal paths. Designers must additionally confirm the end-system safety certification with their notified body.
Được đề xuất
Solar Inverter Communication Interface Isolation
The SI8710BC-B-IS isolates RS-485 / RS-232 / CAN communication ports inside solar inverters, separating the high-voltage DC-bus side from the low-voltage control / monitoring side. Its 3.75 kVrms withstand covers the 1500 VDC photovoltaic-string isolation boundary used in modern residential and commercial inverters; the 15 Mbps rate is more than enough for inverter telemetry protocols like SunSpec Modbus.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho SI8710BC-B-IS — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | SI8710AD-B-IS | SI8710AC-B-IS | SI8662BD-B-IS | SI8660BB-B-IS1 | ADuM1100ARZ |
|---|---|---|---|---|---|---|
| Brand | Skyworks Solutions | Skyworks Solutions | Skyworks Solutions | Skyworks Solutions | Skyworks Solutions | Analog Devices |
| Package | 8-SOIC | 8-SOIC (same) | 8-SOIC (same) | 8-SOIC (same) | 8-SOIC (same) | 8-SOIC (same) |
| Number of Channels | 1 forward | 1 forward | 1 forward | 6 channels | 6 channels | 1 forward |
| Data Rate (max) | 15 Mbps | 15 Mbps | 15 Mbps | 150 Mbps | 150 Mbps | 25 Mbps |
| Isolation Voltage | 3750 Vrms | 3750 Vrms | 5000 Vrms | 5000 Vrms | 3750 Vrms | 2500 Vrms |
| CMTI (min) | 35 kV/us | 35 kV/us | 35 kV/us | 35 kV/us | 35 kV/us | 25 kV/us |
| Supply Voltage | 3 V to 30 V | 3 V to 30 V | 3 V to 30 V | 2.5 V to 5.5 V | 2.5 V to 5.5 V | 3 V to 5.5 V |
| Output Type | Open-collector | Open-collector | Open-collector | Push-pull | Push-pull | Push-pull |
| Input Type | LED emulator (current-driven) | LED emulator (current-driven) | LED emulator (current-driven) | CMOS logic | CMOS logic | CMOS logic |
Bảo phân biệt quan trọng
- 10x lower FIT rate than optocouplers, with no LED aging (vsPC817 optocoupler)
- Wide 3 V to 30 V single-supply range across entire isolation barrier (vsADuM1100ARZ)
- Pin-compatible drop-in upgrade for installed optocoupler designs (vsPC817, HCPL-0631, PS2501L-1-F3-A)
Ghi chú thiết kế
The SI8710BC-B-IS LED-emulator input is not a TTL/CMOS logic input - it requires forward current in the datasheet-specified range (typically 3-10 mA) sourced through a current-limiting resistor. Driving the input directly from a 3.3 V logic pin without a resistor will over-stress the input and possibly damage the device. Compute the resistor value as R = (Vdrive - Vf) / Iforward. The pin-2/3 LED emulator pins also have reverse-voltage limits; never reverse-bias them beyond the absolute-max rating.
Maintain at least 4 mm of creepage and clearance under the SOIC-8 package for 3750 Vrms isolation per UL 1577 / IEC 60747-17. Do not run any PCB traces or copper pours beneath the isolation barrier (between pins 1-4 and pins 5-8). Use slot cuts in the PCB if needed. Both grounds (GND1 pin 4 and GND2 pin 5) must NOT be connected together at the device - they are isolated and should be returned separately to their respective domains.
The open-collector output (pin 6) requires an external pull-up resistor; typical values are 4.7 kOhm to 10 kOhm to VDD2 / pin 7 (VRL). Lower resistor values improve rise time but increase power dissipation; higher values reduce quiescent current at the cost of longer rise times. For 15 Mbps operation choose 4.7 kOhm on a 5 V rail (1 mA output low current). Place the pull-up resistor close to the SI8710BC-B-IS output pin.
At high ambient temperatures near the 125 C maximum, verify that quiescent power dissipation does not push the SOIC-8 junction beyond rated limits. The SOIC-8 package has theta-JA of approximately 150 C/W in still air on a standard JEDEC 4-layer test board. With 3 mA internal current draw from each supply, total quiescent power is approximately 20-30 mW - well below thermal concerns under normal conditions. No heatsink is required.
Thông tin tuân thủ
RoHS/REACH compliant per Skyworks product page; UL 1577 recognition referenced in Si87xx datasheet for 3750 Vrms isolation rating. AEC-Q100 qualification not claimed for SI8710BC-B-IS - consult Skyworks automotive-graded Si87xx variants for vehicle applications.