ISO7842FDWW - Reinforced 4-Ch Digital Isolator | TI
MPN: ISO7842FDWW ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 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 Overview
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.
Drop-in alternatives for ISO7842FDWW — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with ISO7842FDWW (same form factor and footprint) — differing in CMTI, Number of Channels, Isolation Voltage, Data Rate, Package.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ISO7842FDWR
✅ Drop-In📋 Reference alternative (not in catalog)
ISO7842FDW
✅ Drop-In📋 Reference alternative (not in catalog)
ISO7742FDBQR
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$2.35 / Unit
View Datasheet →ISO7741FDBQR
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$0.98 / Unit
View Datasheet →ADUM1401ARWZ
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$2.19 / Unit
View Datasheet →ADUM1411ARWZ
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$1.75 / Unit
View Datasheet →ISO7842FDWW Specifications
| Number of Channels | 4 (2 forward, 2 reverse) |
| Isolation Voltage | 8000 VPK |
| Isolation Rating (Vrms) | 5700 Vrms |
| Data Rate | 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 |
| Operating Temperature Range | -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) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
ISO7842FDWW Pin Configuration
| Pin 1 | VCC1 — Supply voltage for side 1 |
| Pin 2 | GND1 — Ground for side 1 |
| Pin 3 | INA — Input channel A (side 1) |
| Pin 4 | INB — Input channel B (side 1) |
| Pin 5 | OUTC — Output channel C (side 1) |
| Pin 6 | OUTD — Output channel D (side 1) |
| Pin 7 | GND1 — Ground for side 1 |
| Pin 8 | EN1 — Enable for side 1 outputs |
| Pin 9 | EN2 — Enable for side 2 outputs |
| Pin 10 | GND2 — Ground for side 2 |
| Pin 11 | IND — Input channel D (side 2) |
| Pin 12 | INC — Input channel C (side 2) |
| Pin 13 | OUTB — Output channel B (side 2) |
| Pin 14 | OUTA — Output channel A (side 2) |
| Pin 15 | GND2 — Ground for side 2 |
| Pin 16 | VCC2 — Supply voltage for side 2 |
Typical Applications
ISO7842FDWW is suitable for 6 applications: 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.
Recommended
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.
Recommended
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.
Recommended
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.
Recommended
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.
Recommended
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.
Recommended
Recommended Products Summary
Engineering reference data for ISO7842FDWW — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | 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 |
Key Differentiators
- Highest isolation rating in the ISO7842 family (vs ISO7742FDBQR)
- Higher CMTI than many competitors (vs ADUM1401ARWZ)
- Wider temperature range (vs ADUM1401ARWZ)
Design Notes
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.
Compliance Information
RoHS compliant per TI product page. Reinforced isolation certifications per VDE, CSA, CQC, and TUV. Not AEC-Q100 qualified.
