ISO7721DW - 2Ch Reinforced Digital Isolator 100Mbps | TI
MPN: ISO7721DW ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 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 |
Drop-in alternatives for ISO7721DW — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ISO7721DWR
✅ Drop-In📋 Reference alternative (not in catalog)
ISO7720FDW
✅ Drop-In📋 Reference alternative (not in catalog)
ISO7721FQDRQ1
✅ Drop-In📋 Reference alternative (not in catalog)
ISO7241MDW
⚡ Same Package✓ In Stock
$2.19 / Unit
View Datasheet →ISO7721DW Maximum Ratings & Electrical Characteristics
| Number of Channels | 2 (1 forward, 1 reverse) |
| Isolation Rating | 5000 Vrms (per UL 1577) |
| Data Rate | 100 Mbps |
| CMTI | 85 kV/µs |
| Supply Voltage | 2.25 V to 5.5 V |
| Package | 16-SOIC (0.295", 7.50mm Width) |
| Operating Temperature | -55°C to +125°C |
| Default Output State | High |
| Propagation Delay | [DATA_NEEDED: propagation delay] |
| Pulse Width Distortion | [DATA_NEEDED: pulse width distortion] |
| Isolation Working Voltage | 800 Vrms (reinforced) / 566 Vrms (basic) |
| Certifications | UL 1577, VDE, CSA, TUV, CQC |
| RoHS Status | Compliant |
| Mounting Type | Surface Mount |
| Technology | Capacitive isolation |
ISO7721DW Pin Configuration
| Pin 1 | VCC1 — Input side supply voltage (2.25V to 5.5V) |
| Pin 2 | GND1 — Input side ground |
| Pin 3 | INA — Input channel A |
| Pin 4 | OUTA — Output channel A |
| Pin 5 | INB — Input channel B |
| Pin 6 | OUTB — Output channel B |
| Pin 7 | GND1 — Input side ground |
| Pin 8 | NC — No connect |
| Pin 9 | NC — No connect |
| Pin 10 | GND2 — Output side ground |
| Pin 11 | OUTB — Output channel B (redundant) |
| Pin 12 | INB — Input channel B (redundant) |
| Pin 13 | OUTA — Output channel A (redundant) |
| Pin 14 | INA — Input channel A (redundant) |
| Pin 15 | GND2 — Output side ground |
| Pin 16 | VCC2 — Output side supply voltage (2.25V to 5.5V) |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this digital IC. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
ISO7721DW is suitable for 6 applications: 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.
Recommended
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.
Recommended
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.
Recommended
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.
Recommended
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.
Recommended
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.
Recommended
Recommended Products Summary
Engineering reference data for ISO7721DW — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | 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 |
Key Differentiators
- Higher CMTI of 85 kV/µs (vs ISO7241MDW)
- Reinforced isolation rating (vs ISO7241MDW)
- Automotive grade option (vs ISO7721DWR)
Design Notes
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.
Compliance Information
RoHS compliant per TI product page. AEC-Q100 qualified variant available as ISO7721FQDRQ1.
