ISO7721DW - 2Ch Reinforced Digital Isolator 100Mbps | TI
料号： ISO7721DW ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $2.85 | $2.85 |
| 10 | $2.56 | $25.60 |
| 100 | $2.05 | $205.00 |
| 500 | $1.72 | $860.00 |
| 1,000 | $1.45 | $1,450.00 |
ISO7721DW 概述
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.
直接替换替代料： ISO7721DW ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： ISO7721DW （相同外形与封装尺寸） ——差异在于 Default Output State, Number of Channels, Data Rate, Package, Isolation Rating.
快速对比工具——选择替代料号进行并排对比：
ISO7721DWR
✅ 直接替换📋 参考替代料（不在目录中）
ISO7720FDW
✅ 直接替换📋 参考替代料（不在目录中）
ISO7721FQDRQ1
✅ 直接替换📋 参考替代料（不在目录中）
ISO7241MDW
⚡ 相同封装 ⚠️ 规格未核验✓ 有现货
$2.19 / 个
查看数据手册 →ISO7721DW 规格参数
| Number of Channels | 2 (1 forward, 1 reverse) |
| Isolation Rating | 5000 Vrms (per UL 1577) |
| 数据速率 | 100 Mbps |
| CMTI | 85 kV/µs |
| 电源电压 | 2.25 V to 5.5 V |
| 封装 | 16-SOIC (0.295", 7.50mm Width) |
| 工作温度 | -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 |
| RoHS 状态 | Compliant |
| 安装类型 | Surface Mount |
| Technology | Capacitive isolation |
ISO7721DW 引脚配置
| 引脚 1 | VCC1 — Input side supply voltage (2.25V to 5.5V) |
| 引脚 2 | GND1 — Input side ground |
| 引脚 3 | INA — Input channel A |
| 引脚 4 | OUTA — Output channel A |
| 引脚 5 | INB — Input channel B |
| 引脚 6 | OUTB — Output channel B |
| 引脚 7 | GND1 — Input side ground |
| 引脚 8 | NC — No connect |
| 引脚 9 | NC — No connect |
| 引脚 10 | GND2 — Output side ground |
| 引脚 11 | OUTB — Output channel B (redundant) |
| 引脚 12 | INB — Input channel B (redundant) |
| 引脚 13 | OUTA — Output channel A (redundant) |
| 引脚 14 | INA — Input channel A (redundant) |
| 引脚 15 | GND2 — Output side ground |
| 引脚 16 | VCC2 — Output side supply voltage (2.25V to 5.5V) |
典型应用
ISO7721DW 适用于 6 应用s: 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.
推荐
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.
推荐
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.
推荐
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.
推荐
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.
推荐
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.
推荐
推荐产品汇总
工程参考数据： ISO7721DW ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | 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 |
关键差异点
- Higher CMTI of 85 kV/µs （对比 ISO7241MDW)
- Reinforced isolation rating （对比 ISO7241MDW)
- Automotive grade option （对比 ISO7721DWR)
设计说明
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.
合规信息
RoHS compliant per TI product page. AEC-Q100 qualified variant available as ISO7721FQDRQ1.