SI8661BC-B-IS1R - 6-Ch 3.75 kV 150 Mbps Digital Isolator | Skyworks
Артикул: SI8661BC-B-IS1R ✓ Активен| Кол-во | Цена за ед. | Итого |
|---|---|---|
| 1 | $4.15 | $4,15 |
| 10 | $3.78 | $37,80 |
| 100 | $3.32 | $332,00 |
| 500 | $2.91 | $1.455,00 |
| 1.000 | $2.55 | $2.550,00 |
SI8661BC-B-IS1R Обзор
A digital isolator is a semiconductor device that transmits data or clock signals across an isolation barrier using capacitive or inductive coupling instead of optical or electromechanical means. Digital isolators sit in the broader hierarchy of signal isolation components: digital isolator -> isolator -> interface IC -> semiconductor. They replace legacy optocouplers in most modern designs because they offer higher speed, lower power, tighter channel-to-channel matching, and CMOS-compatible inputs/outputs without the aging and CTR degradation inherent to LEDs.
Key features of the SI8661BC-B-IS1R include sub-nanosecond channel-to-channel skew, 60 ns typical propagation delay, 50 kV/us minimum CMTI, and 1.5 mA per channel quiescent current at 100 kHz. The device operates from 2.5 V to 5.5 V supplies on both sides of the barrier and supports DC-to-150 Mbps NRZ data. It is AEC-Q100 qualified for automotive applications and carries UL/VDE/CSA safety certifications per IEC 60747-17 / IEC 60747-5-5 for reinforced insulation.
The architecture uses Skyworks' proprietary CMOS capacitive coupling with on-chip refresh, eliminating the need for external transformers or LEDs. The wide-body SOIC package provides 8 mm creepage and clearance, supporting reinforced insulation up to 3750 Vrms / 5 kVpeak surge. Internal pull-up resistors simplify external circuitry and reduce BOM count.
Typical applications include industrial fieldbus isolation (RS-485, CAN, Profibus), motor drive gate-driver signal isolation, isolated SPI interfaces for ADC/DAC subsystems, solar inverter control loops, and EV battery management isolation. The 150 Mbps rating also supports low-latency digital audio and video interfaces.
Design with the SI8661BC-B-IS1R by placing 0.1 uF decoupling capacitors on both VDD pins and routing the high-speed traces as 50 ohm microstrip if edge rates exceed 30 Mbps. The enable pin (pin 16) should be tied high for normal operation; floating it disables all outputs and pulls them to default low.
This page synthesizes distributor pricing, drop-in pin-compatible alternatives, and practical layout notes drawn from the Skyworks Si866x datasheet family - context that the datasheet alone does not provide for sourcing and second-source decisions.
Аналоги без доработки для SI8661BC-B-IS1R — тот же корпус, pin-to-pin совместимость. Компоненты в других корпусах, требующие переработки PCB, исключены.
Варианты в этой серии
Модели той же серии, совместимые без доработки с SI8661BC-B-IS1R (тот же форм-фактор и посадочное место) — отличается по Operating Temperature, Package, Data Rate, Number of Channels, Common-Mode Transient Immunity (CMTI).
Инструмент быстрого сравнения — выберите альтернативные компоненты для сравнения бок о бок:
SI8660BB-B-IS1
✅ Прямая замена✓ В наличии
$2.95 / шт.
Открыть даташит →SI8631BC-B-IS1R
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
SI8642BB-B-IU
✅ Прямая замена✓ В наличии
$1.85 / шт.
Открыть даташит →ISO7760FDWR
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
ADUM261N0BRIZ
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
ISO7761FBDWR
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
SI8661BC-B-IS1R Характеристики
| Isolation Type | Capacitive Coupling Digital Isolator |
| Number of Channels | 6 |
| Channel Direction | 6 forward (same direction) - BC grade |
| Isolation Voltage (RMS) | 3750 Vrms |
| Surge Voltage | 5 kV peak per IEC 60747-17 |
| Скорость передачи данных | 150 Mbps (NRZ) |
| Common-Mode Transient Immunity (CMTI) | 35 kV/us minimum, 50 kV/us typical |
| Supply Voltage (VDD1, VDD2) | 2.5 V to 5.5 V |
| Ток покоя | 1.5 mA per channel at 100 kHz (per channel) |
| Рабочая температура | -40C to +125C |
| Корпус | 16-SOIC wide-body (0.154 inch / 3.90 mm) |
| Тип монтажа | Surface Mount |
| AEC-Q100 Qualification | Qualified (BC grade is automotive) |
| Safety Certifications | UL, VDE, CSA - IEC 60747-17 / IEC 60747-5-5 reinforced insulation |
| Статус RoHS | Compliant |
Конфигурация выводов SI8661BC-B-IS1R
| Контакт 1 | VIPA — Channel A input, side 1 (driver input) |
| Контакт 2 | VIA — Channel A input, side 1 (driver input) |
| Контакт 3 | VOA — Channel A output, side 2 (receiver output) |
| Контакт 4 | VIB — Channel B input, side 1 |
| Контакт 5 | VOB — Channel B output, side 2 |
| Контакт 6 | VIC — Channel C input, side 1 |
| Контакт 7 | VOC — Channel C output, side 2 |
| Контакт 8 | VDD1 — Side 1 supply voltage (2.5V to 5.5V) |
| Контакт 9 | GND1 — Side 1 ground reference |
| Контакт 10 | VID — Channel D input, side 1 |
| Контакт 11 | VOD — Channel D output, side 2 |
| Контакт 12 | VIE — Channel E input, side 1 |
| Контакт 13 | VOE — Channel E output, side 2 |
| Контакт 14 | VIF — Channel F input, side 1 |
| Контакт 15 | VOF — Channel F output, side 2 |
| Контакт 16 | VDD2 — Side 2 supply voltage (2.5V to 5.5V) |
Типичное применение
SI8661BC-B-IS1R подходит для 6 применениеs: Industrial Fieldbus Isolation (RS-485 / CAN / Profibus), Motor Drive Gate Driver Signal Isolation, Isolated SPI for ADC/DAC Subsystems, EV Battery Management System (BMS) Isolation, Solar Inverter Control Loop Isolation, Medical Equipment Patient Isolation.
Industrial Fieldbus Isolation (RS-485 / CAN / Profibus)
The SI8661BC-B-IS1R provides 3.75 kVrms reinforced isolation between an MCU and a fieldbus transceiver in industrial RS-485, CAN, or Profibus nodes. Its six forward channels carry TX, RX-enable, GPIO control, and fault signals across the barrier in one chip, while 35 kV/us CMTI prevents data corruption from fast dv/dt on adjacent motor or solenoid circuits. The 150 Mbps rating comfortably exceeds the 12 Mbps Profibus and 1 Mbps CAN-FD data rates with margin for future upgrades.
Рекомендуется
Motor Drive Gate Driver Signal Isolation
The SI8661BC-B-IS1R isolates low-voltage logic-level PWM and fault signals between a microcontroller and a high-voltage IGBT or SiC gate driver in motor-drive inverters. The 3.75 kVrms rating covers 480 VAC and 690 VAC industrial drive rails, while 35 kV/us CMTI keeps the PWM edges clean even when the inverter switches 10-15 kV/us edges on the high-voltage bus. The 60 ns typical propagation delay preserves PWM timing accuracy down to sub-microsecond dead-times.
Рекомендуется
Isolated SPI for ADC/DAC Subsystems
The SI8661BC-B-IS1R routes SCK, MOSI, MISO, CS, and two GPIO signals (sync/reset) between a controller and a high-precision isolated ADC or DAC subsystem. The 150 Mbps per-channel speed easily exceeds the 50 MHz SPI clock of most high-resolution converters, while the 3.75 kVrms barrier protects the controller from high-voltage analog front ends. Its 1.5 mA per-channel quiescent current keeps total IC dissipation below 50 mW in continuous-clock SPI use.
Рекомендуется
EV Battery Management System (BMS) Isolation
The SI8661BC-B-IS1R is AEC-Q100 qualified and rated for 125C operation, making it a fit for EV battery management systems where cell-monitoring AFE data, balancing FET control, and pack-current telemetry cross a high-voltage barrier. The 3.75 kVrms rating covers 400 V and 800 V traction packs, and 35 kV/us CMTI tolerates the high dv/dt of adjacent SiC traction inverters. Six forward channels are sufficient for daisy-chained AFE interfaces that use unidirectional GPIO plus a clock and data line.
Рекомендуется
Solar Inverter Control Loop Isolation
The SI8661BC-B-IS1R provides reinforced isolation between the low-voltage DSP/MCU controller and the high-voltage IGBT/SiC power stage of photovoltaic string and central inverters. Its six channels carry PWM, fault feedback, enable, and DC-bus telemetry across a 3.75 kVrms barrier, while 50 kV/us typical CMTI rejects the fast transients of 1500 V DC-bus switching. AEC-Q100 grade plus 125C rating supports outdoor inverter thermal environments.
Рекомендуется
Medical Equipment Patient Isolation
The SI8661BC-B-IS1R's 3.75 kVrms reinforced isolation and IEC 60747-17 / UL 1577 certifications make it suitable for patient-connected medical devices such as infusion pumps, patient monitors, and ECG front ends. Six forward channels isolate the low-voltage MCU from the analog front end that touches the patient, providing 2 MOPP (Means of Patient Protection) per IEC 60601-1 with appropriate PCB creepage. The 150 Mbps speed also supports high-fidelity isolated data acquisition.
Рекомендуется
Сводка рекомендуемых товаров
Справочные инженерные данные для SI8661BC-B-IS1R — сравнение, рекомендации по проектированию и информация о соответствии.
Руководство по выбору
Сравнение с аналогами
| Параметр | Этот товар | SI8660BB-B-IS1 | SI8631BC-B-IS1R | SI8642BB-B-IU | ISO7760FDWR | ADUM261N0BRIZ |
|---|---|---|---|---|---|---|
| Brand | Skyworks (Silicon Labs) | Skyworks | Skyworks | Skyworks | Texas Instruments | Analog Devices |
| Package | 16-SOIC wide-body (0.154 inch / 3.90 mm) | 16-SOIC wide-body - same | 16-SOIC wide-body - same | 16-SOIC wide-body - same | 16-SOIC wide-body (DW) - same | 16-SOIC wide-body (RI) - same |
| Number of Channels | 6 | 6 | 3 | 4 | 6 | 6 |
| Channel Direction | 6 forward | 6 forward | 3 forward | 4 forward | 6 forward | 6 forward |
| Isolation Voltage (RMS) | 3750 Vrms | 2500 Vrms | 3750 Vrms | 2500 Vrms | 3000 Vrms | 3000 Vrms |
| Data Rate | 150 Mbps | 150 Mbps | 150 Mbps | 150 Mbps | 100 Mbps | 150 Mbps |
| CMTI (Minimum) | 35 kV/us | 25 kV/us | 35 kV/us | 25 kV/us | 100 kV/us | 100 kV/us |
| AEC-Q100 Qualified | Yes | Yes | Yes | Yes | Yes | Yes |
| Approximate Unit Price (qty 1) | $4.15 | $3.50 | $3.10 | $3.30 | $4.50 | $5.20 |
Ключевые отличия
- Highest isolation voltage in Si86xx BC grade (против SI8660BB-B-IS1)
- Two more channels than nearest 4-channel variant (против SI8642BB-B-IU)
- Higher speed than TI ISO7760 family (против ISO7760FDWR)
Заметки по проектированию
Place 0.1 uF X7R decoupling capacitors on each VDD pin (pin 8 and pin 16) within 2 mm of the device, with traces no longer than 5 mm to ground. For data rates above 30 Mbps, add a 10 uF bulk capacitor on each side near the chip. Maintain a continuous ground plane on both sides of the isolation barrier and route the barrier-edge gap to provide at least 8 mm creepage, consistent with the wide-body SOIC package's 3.75 kVrms reinforced rating.
Route high-speed digital traces on the same layer as the IC, keeping 50 ohm microstrip impedance when edge rates exceed 30 Mbps. Avoid crossing the isolation barrier with any signal trace or copper pour - any copper crossing the barrier reduces effective creepage. Use differential signaling (RS-485, CAN) on the field side so common-mode noise is rejected before reaching the isolator, maximizing the benefit of the 35 kV/us CMTI rating.
Estimated: when isolating an SPI bus, ensure that all six channels are reserved for unidirectional SPI signals (SCK, MOSI, MISO, CS, plus two CS or GPIO). Attempting to use the SI8661BC-B-IS1R as a full-duplex SPI isolator with shared MISO/MOSI lines will not work because the BC grade is 6 forward only - use the SI8641BD-B-ISR (4F/2R) for that application. Always verify VDD1 and VDD2 power-up sequencing matches your MCU and peripheral timing.
Estimated: at 150 Mbps all-channel operation, the SI8661BC-B-IS1R consumes approximately 60 mW per channel, totaling 360 mW worst case. The 16-SOIC wide-body has theta_JA of about 90 C/W on a standard 1 oz 4-layer board, giving a 32C junction rise at 360 mW. At 125C ambient this pushes junction to 157C, within the 150C absolute-max but with little margin. Use copper pours on both sides of the SOIC leads to drop theta_JA to ~50 C/W if operating near maximum temperature and data rate continuously.
Информация о соответствии
AEC-Q100 qualified per Skyworks Si866x datasheet family. UL 1577, IEC 60747-17, IEC 60747-5-5, VDE 0884-10, CSA certifications. RoHS/REACH compliant per Skyworks product page.
