ISO7842FDWW - Reinforced 4-Ch Digital Isolator | TI
料号： ISO7842FDWW ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $3.42 | $3.42 |
| 10 | $3.08 | $30.80 |
| 100 | $2.74 | $274.00 |
| 500 | $2.47 | $1,235.00 |
| 1,000 | $2.19 | $2,190.00 |
ISO7842FDWW 概述
A digital isolator is a component that provides electrical isolation between two circuits while allowing digital signals to pass across the isolation barrier. It uses capacitive or magnetic coupling to transfer data without a direct electrical connection, protecting sensitive electronics from high voltages, ground loops, and noise. Digital isolators are essential in systems where safety and signal integrity are critical, such as in motor drives, power converters, and medical devices. They replace optocouplers in many applications due to their higher speed, lower power consumption, and better reliability.
Key features of the ISO7842FDWW include its reinforced isolation certifications per VDE, CSA, CQC, and TUV, ensuring compliance with international safety standards. The device offers low power consumption, typically 1.7 mA per channel at 1 Mbps, and supports a wide supply range, making it versatile for various voltage domains. Its high CMTI of 100 kV/µs ensures robust operation in environments with fast voltage transients, such as motor drives and inverters. The 2/2 channel configuration provides flexibility for bidirectional communication, and the device is available in both SOIC wide-body (DW) and extra-wide body (DWW) packages.
Technically, the ISO7842FDWW uses a capacitive isolation barrier with an on-off keying (OOK) modulation scheme, which provides high-speed data transfer with low propagation delay and skew. The device features an enable pin for output control and a fail-safe mode that defaults to a known state when the input is unpowered. The wide supply range and level translation capability allow direct interfacing with different logic levels, simplifying system design. The device is designed to meet reinforced isolation requirements, providing double protection for safety-critical applications.
Typical applications include industrial fieldbus communication, motor drives, power inverters, and isolated SPI/UART interfaces. The ISO7842FDWW is also used in medical equipment, test and measurement instruments, and renewable energy systems where galvanic isolation is required. Its high-speed capability and robust isolation make it ideal for applications demanding reliable data transfer across an isolation barrier.
When designing with the ISO7842FDWW, ensure proper PCB layout with adequate creepage and clearance distances to maintain the isolation rating. Place decoupling capacitors close to the VCC pins and follow the manufacturer's guidelines for barrier spacing. The device's high CMTI requires careful attention to layout to minimize parasitic coupling and maintain signal integrity.
直接替换替代料： ISO7842FDWW ——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： ISO7842FDWW （相同外形与封装尺寸） ——差异在于 CMTI, Number of Channels, Isolation Voltage, Data Rate, Package.
快速对比工具——选择替代料号进行并排对比：
ISO7842FDWR
✅ 直接替换📋 参考替代料（不在目录中）
ISO7842FDW
✅ 直接替换📋 参考替代料（不在目录中）
ISO7742FDBQR
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$2.35 / 个
查看数据手册 →ISO7741FDBQR
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$0.98 / 个
查看数据手册 →ADUM1401ARWZ
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$2.19 / 个
查看数据手册 →ADUM1411ARWZ
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$1.75 / 个
查看数据手册 →ISO7842FDWW 规格参数
| Number of Channels | 4 (2 forward, 2 reverse) |
| Isolation Voltage | 8000 VPK |
| Isolation Rating (Vrms) | 5700 Vrms |
| 数据速率 | 100 Mbps |
| CMTI | 100 kV/µs |
| Propagation Delay | 11 ns (typical) |
| Supply Voltage Range | 2.25 V to 5.5 V |
| Level Translation | 2.25 V to 5.5 V |
| 工作温度范围 | -55°C to +125°C |
| Power Consumption | 1.7 mA per channel at 1 Mbps (typical) |
| Package Type | SOIC-16 (DWW) extra-wide body |
| Creepage Distance | 14.5 mm |
| Certifications | VDE, CSA, CQC, TUV (reinforced) |
| 安装类型 | Surface Mount |
| RoHS 状态 | Compliant |
ISO7842FDWW 引脚配置
| 引脚 1 | VCC1 — Supply voltage for side 1 |
| 引脚 2 | GND1 — Ground for side 1 |
| 引脚 3 | INA — Input channel A (side 1) |
| 引脚 4 | INB — Input channel B (side 1) |
| 引脚 5 | OUTC — Output channel C (side 1) |
| 引脚 6 | OUTD — Output channel D (side 1) |
| 引脚 7 | GND1 — Ground for side 1 |
| 引脚 8 | EN1 — Enable for side 1 outputs |
| 引脚 9 | EN2 — Enable for side 2 outputs |
| 引脚 10 | GND2 — Ground for side 2 |
| 引脚 11 | IND — Input channel D (side 2) |
| 引脚 12 | INC — Input channel C (side 2) |
| 引脚 13 | OUTB — Output channel B (side 2) |
| 引脚 14 | OUTA — Output channel A (side 2) |
| 引脚 15 | GND2 — Ground for side 2 |
| 引脚 16 | VCC2 — Supply voltage for side 2 |
典型应用
ISO7842FDWW 适用于 6 应用s: Industrial Fieldbus Communication, Motor Drives and Inverters, Isolated SPI/UART Interfaces, Power Converters and SMPS, Medical Equipment, Test and Measurement Instruments.
Industrial Fieldbus Communication
The ISO7842FDWW provides galvanic isolation for industrial fieldbus interfaces such as PROFIBUS, CAN, and RS-485. Its 100 Mbps data rate and high CMTI of 100 kV/µs ensure reliable communication in electrically noisy environments. The 2/2 channel configuration allows bidirectional data transfer, and the wide supply range (2.25V to 5.5V) enables level translation between different logic domains. The reinforced isolation (8000 VPK) protects sensitive controllers from voltage transients and ground loops, enhancing system safety and reliability.
推荐
Motor Drives and Inverters
In motor drives and inverters, the ISO7842FDWW isolates gate driver signals and feedback paths. Its high CMTI (100 kV/µs) prevents false triggering during fast switching transients, and the 100 Mbps data rate supports high-frequency PWM signals. The wide temperature range (-55°C to +125°C) suits harsh industrial environments. The reinforced isolation (8000 VPK) provides safety isolation between high-voltage power stages and low-voltage control circuits, meeting international safety standards.
推荐
Isolated SPI/UART Interfaces
The ISO7842FDWW is ideal for isolating SPI or UART communication between microcontrollers and peripheral devices. Its 2/2 channel configuration can isolate clock, data, and control signals, while the 100 Mbps data rate supports high-speed SPI. The low propagation delay (11 ns) minimizes signal latency, and the wide supply range allows interfacing with different logic levels. The reinforced isolation ensures safe operation in medical and industrial equipment where galvanic isolation is required.
推荐
Power Converters and SMPS
In power converters and switched-mode power supplies (SMPS), the ISO7842FDWW isolates feedback and control signals across the isolation barrier. Its high CMTI (100 kV/µs) ensures stable operation in the presence of high dv/dt transients, and the 100 Mbps data rate supports fast control loops. The wide supply range (2.25V to 5.5V) enables level translation between primary and secondary side controllers. The reinforced isolation (8000 VPK) provides safety isolation for high-voltage applications.
推荐
Medical Equipment
The ISO7842FDWW is used in medical devices requiring galvanic isolation for patient safety. Its reinforced isolation (8000 VPK) meets stringent safety standards, and the low power consumption (1.7 mA per channel) is suitable for battery-powered devices. The wide temperature range and high reliability make it suitable for diagnostic equipment, patient monitors, and imaging systems. The 100 Mbps data rate supports high-speed data acquisition and communication.
推荐
Test and Measurement Instruments
In test and measurement equipment, the ISO7842FDWW isolates measurement circuits from host controllers, preventing ground loops and noise interference. Its high CMTI (100 kV/µs) ensures accurate measurements in electrically noisy environments, and the 100 Mbps data rate supports high-speed data transfer. The wide supply range allows interfacing with various logic levels, and the reinforced isolation provides safety for high-voltage measurements. The device's low propagation delay (11 ns) is critical for precise timing.
推荐
推荐产品汇总
工程参考数据： ISO7842FDWW ——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 | ISO7842FDWR | ISO7842FDW | ISO7742FDBQR | ADUM1401ARWZ |
|---|---|---|---|---|---|
| Package | SOIC-16 (DWW) | SOIC-16 (DW) | SOIC-16 (DW) | SOIC-16 (DW) | SOIC-16 (DW) |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Analog Devices |
| Isolation Voltage (VPK) | 8000 | 8000 | 8000 | 5000 | 2500 |
| Data Rate (Mbps) | 100 | 100 | 100 | 100 | 90 |
| CMTI (kV/µs) | 100 | 100 | 100 | 85 | 25 |
| Propagation Delay (ns) | 11 | 11 | 11 | 10.7 | 50 |
| Supply Voltage Range (V) | 2.25 to 5.5 | 2.25 to 5.5 | 2.25 to 5.5 | 2.25 to 5.5 | 2.7 to 5.5 |
| Operating Temperature (°C) | -55 to 125 | -55 to 125 | -55 to 125 | -55 to 125 | -40 to 105 |
关键差异点
- Highest isolation rating in the ISO7842 family （对比 ISO7742FDBQR)
- Higher CMTI than many competitors （对比 ADUM1401ARWZ)
- Wider temperature range （对比 ADUM1401ARWZ)
设计说明
For the ISO7842FDWW, maintain at least 14.5 mm creepage distance between the high-voltage and low-voltage sides on the PCB to preserve the reinforced isolation rating. Use a slot or cutout under the device to increase creepage if needed. Place decoupling capacitors (0.1 µF and 10 µF) close to each VCC pin, and ensure a solid ground plane on each side.
To achieve the specified CMTI of 100 kV/µs, minimize parasitic capacitance between the input and output sides. Avoid routing high-speed signals parallel to the isolation barrier, and keep the barrier area clear of copper. Use proper grounding techniques, such as a star ground or separate ground planes, to reduce noise coupling.
Do not exceed the absolute maximum supply voltage of 6V on either side. Ensure that the enable pins (EN1, EN2) are properly driven to avoid unintended output states. When the input side is unpowered, the outputs default to a fail-safe state; verify this behavior in your system design. Also, note that the DWW package has a wider body than the DW package, so ensure your PCB footprint matches the correct package.
合规信息
RoHS compliant per TI product page. Reinforced isolation certifications per VDE, CSA, CQC, and TUV. Not AEC-Q100 qualified.
