ISO7721DW - 2Ch Reinforced Digital Isolator 100Mbps | TI
MPN: ISO7721DW ✓ Hoạt độngISO7721DW Tóm tắt
Digital isolators are essential components that transfer digital signals across an isolation barrier, preventing dangerous voltages or ground loops from affecting sensitive circuitry. They replace optocouplers in many designs, offering higher speed, better reliability, and lower power consumption. The ISO7721DW belongs to the ISO772x family, which includes devices with reinforced insulation ratings certified by VDE, CSA, TUV, and CQC, in addition to UL 1577.
Key features of the ISO7721DW include a dual-channel configuration with one forward and one reverse channel (1/1), a wide supply voltage range of 2.25 V to 5.5 V, and a default output state that is high when the input is unpowered. The device supports both 3.3 V and 5 V logic levels, making it versatile for mixed-voltage systems. Its robust EMC performance ensures reliable operation in noisy industrial environments.
The ISO7721DW uses TI's capacitive isolation technology, which provides superior immunity to magnetic interference compared to traditional optocouplers. The isolation barrier is rated for 5000 Vrms, with a working voltage of 800 Vrms (reinforced) or 566 Vrms (basic), depending on the certification. The device also features a fail-safe output that defaults to a known state if the input side loses power, enhancing system safety.
Typical applications include industrial fieldbus communication (e.g., PROFIBUS, Modbus), motor drives, power inverters, and isolated SPI/UART interfaces. The high CMTI of 85 kV/µs makes it suitable for applications with fast-switching power stages, such as SiC and GaN inverters, where transient noise can corrupt signals.
When designing with the ISO7721DW, ensure proper PCB layout with adequate isolation spacing and place decoupling capacitors close to the VCC pins. The device supports a wide temperature range of -55°C to +125°C, making it suitable for harsh environments.
Bộ thay thế dễ dàng lắp đặt cho ISO7721DW — 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 ISO7721DW (cùng hình factor và footprint) — khác nhau ở Default Output State, Number of Channels, Data Rate, Package, Isolation Rating.
ISO7721DWR
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ISO7720FDW
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ISO7721FQDRQ1
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ISO7241MDW
⚡ Đồng gói ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →ISO7721DW Thông số kỹ thuật
| Number of Channels | 2 (1 forward, 1 reverse) |
| Isolation Rating | 5000 Vrms (per UL 1577) |
| Tốc độ dữ liệu | 100 Mbps |
| CMTI | 85 kV/µs |
| Điện áp cung cấp | 2.25 V to 5.5 V |
| Hộp | 16-SOIC (0.295", 7.50mm Width) |
| Nhiệt độ hoạt động | -55°C to +125°C |
| Default Output State | High |
| Isolation Working Voltage | 800 Vrms (reinforced) / 566 Vrms (basic) |
| Certifications | UL 1577, VDE, CSA, TUV, CQC |
| Trạng thái RoHS | Compliant |
| Kiểu lắp đặt | Surface Mount |
| Technology | Capacitive isolation |
Cấu hình chân ISO7721DW
| Chân 1 | VCC1 — Input side supply voltage (2.25V to 5.5V) |
| Chân 2 | GND1 — Input side ground |
| Chân 3 | INA — Input channel A |
| Chân 4 | OUTA — Output channel A |
| Chân 5 | INB — Input channel B |
| Chân 6 | OUTB — Output channel B |
| Chân 7 | GND1 — Input side ground |
| Chân 8 | NC — No connect |
| Chân 9 | NC — No connect |
| Chân 10 | GND2 — Output side ground |
| Chân 11 | OUTB — Output channel B (redundant) |
| Chân 12 | INB — Input channel B (redundant) |
| Chân 13 | OUTA — Output channel A (redundant) |
| Chân 14 | INA — Input channel A (redundant) |
| Chân 15 | GND2 — Output side ground |
| Chân 16 | VCC2 — Output side supply voltage (2.25V to 5.5V) |
Ứng dụng tiêu biểu
ISO7721DW phù hợp cho 6 Áp dụngs: Industrial Fieldbus Communication, Motor Drives and Inverters, Isolated SPI/UART Interfaces, Power Inverters for Renewable Energy, Automotive Battery Management Systems, Medical Equipment Isolation.
Industrial Fieldbus Communication
The ISO7721DW provides galvanic isolation for industrial fieldbus interfaces such as PROFIBUS and Modbus. Its 100 Mbps data rate and 85 kV/µs CMTI ensure reliable data transmission in noisy industrial environments. The reinforced 5000 Vrms isolation protects against ground potential differences and voltage surges, while the wide supply range (2.25 V to 5.5 V) allows interfacing with various logic levels. The device's robust EMC performance minimizes the risk of data corruption, making it ideal for factory automation and process control systems.
Được đề xuất
Motor Drives and Inverters
In motor drives and inverters, the ISO7721DW isolates gate driver signals from the microcontroller, preventing high-voltage transients from damaging control electronics. The high CMTI of 85 kV/µs ensures reliable operation in the presence of fast-switching IGBTs or SiC MOSFETs, which generate significant common-mode noise. The device's 5000 Vrms isolation rating meets the safety requirements for industrial motor control, and its wide temperature range (-55°C to +125°C) suits harsh operating environments. The dual-channel configuration with one reverse channel is ideal for transmitting feedback signals.
Được đề xuất
Isolated SPI/UART Interfaces
The ISO7721DW is well-suited for isolating SPI or UART communication between microcontrollers and peripheral devices such as ADCs, DACs, or sensors. Its 100 Mbps data rate supports high-speed SPI clocks, while the dual-channel configuration can carry both data and clock signals. The device's low propagation delay and pulse width distortion ensure accurate data transfer, and the fail-safe output defaults to a known state if the input side loses power, enhancing system reliability. The 16-pin SOIC package provides adequate spacing for reinforced isolation in space-constrained designs.
Được đề xuất
Power Inverters for Renewable Energy
In solar inverters and wind power systems, the ISO7721DW isolates control signals from high-voltage power stages, ensuring safety and reliability. The reinforced 5000 Vrms isolation rating meets the stringent requirements of photovoltaic and energy storage systems, while the high CMTI prevents false triggering during switching transients. The device's wide operating temperature range and robust EMC performance make it suitable for outdoor installations. The dual-channel configuration allows for both forward control signals and reverse status feedback, simplifying system design.
Được đề xuất
Automotive Battery Management Systems
The ISO7721DW is used in automotive battery management systems (BMS) to isolate communication between the battery pack and the vehicle's control unit. Its AEC-Q100 qualified variant (ISO7721FQDRQ1) is available for automotive applications, ensuring reliability under extreme temperatures and vibration. The 5000 Vrms isolation rating protects against high-voltage battery stacks, while the 100 Mbps data rate supports fast communication for cell monitoring. The device's fail-safe output ensures safe operation even if the input side loses power, which is critical for safety in electric vehicles.
Được đề xuất
Medical Equipment Isolation
The ISO7721DW provides galvanic isolation in medical devices such as patient monitors and diagnostic equipment, protecting patients and operators from electrical hazards. The reinforced 5000 Vrms isolation rating meets medical safety standards, and the low leakage current ensures patient safety. The device's high data rate supports real-time signal transmission, while the wide supply voltage range allows integration with various medical-grade power supplies. The compact 16-SOIC package is suitable for space-constrained medical devices, and the wide temperature range ensures reliable operation in clinical environments.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho ISO7721DW — 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 | ISO7721DWR | ISO7720FDW | ISO7721FQDRQ1 | ISO7241MDW |
|---|---|---|---|---|---|
| Package | 16-SOIC (7.50mm) | 16-SOIC (7.50mm) - same | 16-SOIC (7.50mm) - same | 16-SOIC (7.50mm) - same | 16-SOIC (7.50mm) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Number of Channels | 2 (1/1) | 2 (1/1) | 2 (2/0) | 2 (1/1) | 4 (2/2) |
| Isolation Rating | 5000 Vrms | 5000 Vrms | 5000 Vrms | 5000 Vrms | 4000 Vrms |
| Data Rate | 100 Mbps | 100 Mbps | 100 Mbps | 100 Mbps | 150 Mbps |
| CMTI | 85 kV/µs | 85 kV/µs | 85 kV/µs | 85 kV/µs | 25 kV/µs |
| Supply Voltage | 2.25V to 5.5V | 2.25V to 5.5V | 2.25V to 5.5V | 2.25V to 5.5V | 3.0V to 5.5V |
| Automotive Grade | No | No | No | Yes (AEC-Q100) | No |
Bảo phân biệt quan trọng
- Higher CMTI of 85 kV/µs (vsISO7241MDW)
- Reinforced isolation rating (vsISO7241MDW)
- Automotive grade option (vsISO7721DWR)
Ghi chú thiết kế
For reinforced isolation, ensure the PCB layout provides adequate creepage and clearance distances between the input and output sides. The ISO7721DW in the 16-SOIC package requires a minimum creepage of 8 mm for 5000 Vrms reinforced isolation per UL 1577. Place a slot or gap in the PCB under the device to increase the isolation distance and prevent surface leakage currents.
Decouple the VCC1 and VCC2 pins with 0.1 µF ceramic capacitors placed as close as possible to the pins. Additionally, use a 10 µF bulk capacitor on each supply rail if the power source is distant. Proper decoupling ensures stable operation and reduces noise coupling across the isolation barrier.
Do not exceed the absolute maximum ratings for supply voltage (6 V) or input/output voltage. Ensure that the input signals do not exceed the supply voltage range. Also, verify that the default output state (high) is acceptable for your application; if a low default is required, consider the ISO7721FDWVR variant.
Thông tin tuân thủ
RoHS compliant per TI product page. AEC-Q100 qualified variant available as ISO7721FQDRQ1.