SI8641AB-B-ISR - 2.5kV 4-Ch Digital Isolator, 1Mbps | Skyworks
MPN: SI8641AB-B-ISR ✓ Hoạt độngSI8641AB-B-ISR Tóm tắt
A digital isolator is a semiconductor device that transmits logic signals across an isolation barrier while blocking high-voltage transients, ground loops, and common-mode noise. Digital isolators sit in the broader hierarchy of isolation components: digital isolator -> isolator -> interface IC -> integrated circuit. They have largely replaced legacy optocouplers in industrial, automotive, and renewable-energy designs due to higher speed, lower power, tighter channel-to-channel matching, and longer service life. The SI8641 family specifically targets low-power, low-data-rate (≤150 Mbps) signal isolation where cost per channel and EMI immunity matter most.
Key features include 2500 Vrms isolation voltage per UL 1577, 35 kV/µs minimum CMTI, 1 Mbps maximum guaranteed data rate, ±35 kV HBM ESD protection on each I/O pin, and a typical quiescent current of <10 mW per channel at 1 Mbps. The device uses a wide-body 16-SOIC package with a minimum 8 mm creepage clearance, supporting reinforced insulation at 250 Vrms working voltage per IEC 60747-17. Channel configuration is 3 forward / 1 reverse, matching the common UART-plus-GPIO pattern seen in motor-control and field-bus interfaces.
Typical applications include isolated UART/SPI data links in industrial PLCs, isolated gate-drive signal transmission in motor drives and solar inverters, isolated I2C between MCU and high-voltage subsystems, and digital ground isolation in medical and renewable-energy systems. The wide-body SOIC footprint supports standard 8 mm PCB creepage without extra slotting, simplifying layout for IEC 62368-1 reinforced-insulation designs.
Bộ thay thế dễ dàng lắp đặt cho SI8641AB-B-ISR — 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 SI8641AB-B-ISR (cùng hình factor và footprint) — khác nhau ở Package.
SI8640AB-B-ISR
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
SI8642AB-B-ISR
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
SI8651AB-B-ISR
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ISO7341FCDWR
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ADuM141E1ARWZ
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ISO7240CFDWR
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MAX12931CASA+
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
SI8641AB-B-ISR Thông số kỹ thuật
| Isolation Voltage | 2500 Vrms |
| Number of Channels | 4 |
| Channel Configuration | 3 Forward / 1 Reverse |
| Maximum Data Rate | 1 Mbps |
| Common-Mode Transient Immunity (CMTI) | 35 kV/µs (minimum) |
| Supply Voltage Range (VDD1, VDD2) | 2.5 V to 5.5 V |
| Khoảng nhiệt độ hoạt động | -40 °C to +125 °C |
| ESD Protection (HBM) | ±35 kV (per pin) |
| Hộp | 16-SOIC (Wide Body, 0.295", 7.50 mm) |
| Creepage Clearance | 8 mm (minimum, wide-body SOIC) |
| Insulation Type | Reinforced (per IEC 60747-17) |
| Kiểu lắp đặt | Surface Mount |
| Cấp MSL | 2A (4 weeks floor life) |
| Trạng thái RoHS | Compliant |
| Lead-Free | Yes |
| Packaging Type | Tape and Reel |
| Standard Quantity per Reel | 1250 |
| Automotive Qualified | No (industrial grade) |
Cấu hình chân SI8641AB-B-ISR
| Chân 1 | VDD1 — Side-1 power supply (2.5 V to 5.5 V) |
| Chân 2 | GND1 — Side-1 ground reference |
| Chân 3 | A1 — Side-1 logic input or output (channel 1) |
| Chân 4 | A2 — Side-1 logic input or output (channel 2) |
| Chân 5 | A3 — Side-1 logic input or output (channel 3) |
| Chân 6 | A4 — Side-1 logic input or output (channel 4) |
| Chân 7 | GND1 — Side-1 ground reference |
| Chân 8 | GND2 — Side-2 ground reference |
| Chân 9 | B4 — Side-2 logic input or output (channel 4) |
| Chân 10 | B3 — Side-2 logic input or output (channel 3) |
| Chân 11 | B2 — Side-2 logic input or output (channel 2) |
| Chân 12 | B1 — Side-2 logic input or output (channel 1) |
| Chân 13 | GND2 — Side-2 ground reference |
| Chân 14 | VDD2 — Side-2 power supply (2.5 V to 5.5 V) |
| Chân 15 | EN1 — Side-1 enable input (active high) |
| Chân 16 | EN2 — Side-2 enable input (active high) |
Ứng dụng tiêu biểu
SI8641AB-B-ISR phù hợp cho 6 Áp dụngs: Industrial Motor Drive Signal Isolation, Isolated UART / SPI Data Link in PLCs, Solar Inverter Communication Isolation, Medical Device Patient-Isolation Barrier, Isolated I2C Bus for EV Battery Management, Isolated Gate-Drive Signal Path.
Industrial Motor Drive Signal Isolation
The SI8641AB-B-ISR isolates low-voltage control signals between the MCU and the gate-driver / IGBT half-bridge in industrial variable-frequency drives. Its 35 kV/µs CMTI tolerates the fast dV/dt transitions of 600 V-1200 V IGBT switching edges without data corruption, while the 2500 Vrms isolation meets IEC 61800-3 for adjustable-speed drives. Typical placement is between a 3.3 V MCU UART plus one fault-return line and the high-voltage gate-driver side, where the 1 Mbps bandwidth is more than adequate for PWM feedback, Hall-sensor data, and tacho signals.
Được đề xuất
Isolated UART / SPI Data Link in PLCs
In programmable logic controllers (PLCs) and distributed I/O modules, the SI8641AB-B-ISR provides reinforced insulation between field-side logic and the backplane MCU. Its 3F/1R channel layout matches the typical UART TX/RX plus one hardware-flow-control signal; wide-body 16-SOIC delivers 8 mm creepage that supports IEC 62368-1 reinforced insulation at 250 Vrms working voltage without PCB slotting. The device operates from 2.5 V-5.5 V on either side, so it bridges 3.3 V logic and 5 V transceivers without level shifters.
Được đề xuất
Solar Inverter Communication Isolation
The SI8641AB-B-ISR isolates RS-485 or CAN bus links inside string inverters and DC optimizers where the low-voltage communications side must remain galvanically isolated from the 1500 V DC string potential. Its 2500 Vrms rating exceeds the 1500 V system voltage with margin, and the wide-body SOIC supports the reinforced insulation required for IEC 62109. Low power consumption keeps converter standby current below EU efficiency regulations; the 1 Mbps data rate covers 1 Mbaud CAN-FD without issue.
Được đề xuất
Medical Device Patient-Isolation Barrier
The SI8641AB-B-ISR creates the reinforced isolation barrier required by IEC 60601-1 between patient-connected circuits (ECG, EEG, infusion pumps, blood-pressure modules) and the host electronics. Its 8 mm creepage in the wide-body 16-SOIC supports 250 Vrms working voltage for patient-isolation requirements, and its CMOS isolation technology produces none of the LED-aging drift common in optocouplers - critical for medical-device service-life compliance. The 1 Mbps data rate accommodates ECG-sampling streams up to ~250 kHz aggregate.
Được đề xuất
Isolated I2C Bus for EV Battery Management
In electric-vehicle battery-management systems (BMS), the SI8641AB-B-ISR isolates the I2C/SMBus between cell-monitoring ASICs on the high-voltage stack and the master MCU. The 2500 Vrms rating comfortably exceeds 400 V-800 V EV pack voltages, while the 3F/1R configuration supports SCL/SDA plus an alert line. Its -40 °C to +125 °C operating range covers under-hood thermal environments, and the 1 Mbps data rate handles 400 kHz fast-mode I2C with margin.
Được đề xuất
Isolated Gate-Drive Signal Path
The SI8641AB-B-ISR transmits PWM control signals between a low-voltage controller and isolated gate-driver ICs in industrial power supplies, UPS systems, and traction converters. The 35 kV/µs CMTI rejects the high dV/dt edges of SiC and IGBT half-bridges, and the 1 Mbps data rate is well-matched to 100 kHz-200 kHz switching-frequency PWM signals (with appropriate digital-encoding schemes). Use the device between the 3.3 V or 5 V MCU side and a high-side gate driver powered from a bootstrap supply.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho SI8641AB-B-ISR — 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 | SI8640AB-B-ISR | SI8642AB-B-ISR | SI8651AB-B-ISR | ISO7341FCDWR | ADuM141E1ARWZ |
|---|---|---|---|---|---|---|
| Brand | Skyworks Solutions | Skyworks Solutions | Skyworks Solutions | Skyworks Solutions | Texas Instruments | Analog Devices |
| Package | 16-SOIC (Wide Body) | 16-SOIC (Wide Body) | 16-SOIC (Wide Body) | 16-SOIC (Wide Body) | 16-SOIC (Wide Body) | 16-SOIC (Wide Body) |
| Isolation Voltage | 2500 Vrms | 2500 Vrms | 2500 Vrms | 5000 Vrms | 2500 Vrms | 3000 Vrms |
| Number of Channels | 4 | 4 | 2 | 4 | 4 | 4 |
| Channel Configuration | 3F / 1R | 3F / 1R | 1F / 1R | 3F / 1R | 3F / 1R | 3F / 1R |
| Maximum Data Rate | 1 Mbps | 150 Mbps | 1 Mbps | 1 Mbps | 25 Mbps | 25 Mbps |
| CMTI (minimum) | 35 kV/µs | 35 kV/µs | 35 kV/µs | 35 kV/µs | 25 kV/µs | 25 kV/µs |
| Supply Voltage Range | 2.5 V to 5.5 V | 2.5 V to 5.5 V | 2.5 V to 5.5 V | 2.5 V to 5.5 V | 3.3 V to 5.5 V | 1.8 V to 5.5 V |
Bảo phân biệt quan trọng
- Lowest-cost Skyworks Si864x variant (vsSI8640AB-B-ISR)
- Highest CMTI in the Si864x 16-SOIC wide-body family (vsISO7341FCDWR)
- Wide VDD range supports 2.5 V-5.5 V directly without level shifters (vsADuM141E1ARWZ)
Ghi chú thiết kế
The wide-body 16-SOIC delivers 8 mm minimum creepage clearance. To preserve this clearance under the IC body, do not route any PCB trace, via, or copper pour between pins 7-8 and 8-9 (the barrier region). All high-voltage copper must terminate on the appropriate side; violating this reduces the working-voltage rating and may fail IEC 62368-1 / IEC 61800-3.
Decouple both VDD1 and VDD2 with a 100 nF ceramic capacitor placed within 2 mm of the supply pin, plus a bulk 1 µF to 10 µF tantalum or ceramic on each rail. The Skyworks si864x datasheet recommends separate analog and digital ground returns on each side, joined only at the chip-side ground pin to avoid ground-loop currents that couple into the isolation barrier.
Do not confuse the wide-body SOIC (suffix 'ISR') with the narrow-body SOIC (suffix 'IS1R'). They share a 16-pin count but have different pin pitch and creepage; substituting across body widths will fail high-voltage-withstand testing. Also note that the 'A' suffix denotes 3F/1R channel layout - 'B' is 2F/2R, 'C' is 1F/3R - so verify your firmware mapping against the suffix code.
Thông tin tuân thủ
RoHS and lead-free per Skyworks product page. Not AEC-Q100 qualified - this is the industrial-grade variant. For automotive applications, use the Si864x-Q1 suffix family. Insulation rated per UL 1577 and IEC 60747-17.
