ISO7321CDR - 25Mbps Dual-Channel Digital Isolator | TI
MPN: ISO7321CDR β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.85 | $1.85 |
| 10 | $1.66 | $16.60 |
| 100 | $1.48 | $148.00 |
| 500 | $1.33 | $665.00 |
| 1,000 | $1.2 | $1,200.00 |
Drop-in alternatives for ISO7321CDR β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
ISO7321C
β Drop-Inπ Reference alternative (not in catalog)
ISO7321FCDR
β Drop-Inπ Reference alternative (not in catalog)
ISO7320CDR
β Drop-Inπ Reference alternative (not in catalog)
ISO7420EDR
β Drop-Inπ Reference alternative (not in catalog)
ADUM1201ARZ
β Drop-Inβ In Stock
$1.22 / Unit
View Datasheet βSi8621
β Drop-Inπ Reference alternative (not in catalog)
MAX12931
β Drop-Inπ Reference alternative (not in catalog)
ISO7321CDR Maximum Ratings & Electrical Characteristics
| Number of Channels | 2 |
| Forward/Reverse Channels | 1/1 |
| Isolation Rating | 3000 Vrms (UL), 4242 Vpk (VDE) |
| Signaling Rate | 25 Mbps |
| CMTI | 25 kV/Β΅s |
| Supply Voltage Range | 3 V to 5.5 V |
| ICC per Channel at 1 Mbps (5V) | 1.7 mA |
| ICC per Channel at 1 Mbps (3.3V) | 1.2 mA |
| Operating Temperature Range | -40Β°C to 125Β°C |
| Package | SOIC-8 (D) |
| Mounting Type | Surface Mount |
| Integrated Noise Filter | Yes |
| Default Output | High and Low options |
| Isolation Technology | Capacitive with SiO2 barrier |
| RoHS Status | Compliant |
ISO7321CDR Pin Configuration
| Pin 1 | VCC1 β Supply voltage for side 1 |
| Pin 2 | GND1 β Ground for side 1 |
| Pin 3 | INA β Input channel A |
| Pin 4 | INB β Input channel B |
| Pin 5 | OUTB β Output channel B |
| Pin 6 | OUTA β Output channel A |
| Pin 7 | GND2 β Ground for side 2 |
| Pin 8 | VCC2 β Supply voltage for side 2 |
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
ISO7321CDR is suitable for 6 applications: Industrial Fieldbus Communication, Isolated SPI/UART Interfaces, Motor Control Feedback, Isolated Power Supply Monitoring, Medical Equipment Isolation, Automotive Electronics.
Industrial Fieldbus Communication
The ISO7321CDR is ideal for industrial fieldbus communication, such as PROFIBUS and Modbus, where galvanic isolation is required to protect against ground loops and voltage transients. Its 25 Mbps signaling rate supports high-speed data transmission, while the 25 kV/Β΅s CMTI ensures reliable operation in noisy industrial environments. The low power consumption (1.7 mA per channel at 5V) makes it suitable for bus-powered devices. The integrated noise filter on the inputs helps reject EMI, maintaining signal integrity over long cable runs. The SOIC-8 package allows for compact PCB designs in space-constrained field devices.
Recommended
Isolated SPI/UART Interfaces
The ISO7321CDR is well-suited for isolated SPI and UART interfaces, providing two channels for clock and data signals. Its 25 Mbps signaling rate easily handles SPI clock frequencies up to 25 MHz, while the 3V to 5.5V supply range allows interfacing with both 3.3V and 5V microcontrollers. The default output high option ensures a defined state on power-up, preventing spurious data. The low power consumption is beneficial for battery-powered or power-sensitive designs. The integrated noise filter improves signal integrity in electrically noisy environments, making it ideal for industrial sensors and actuators.
Recommended
Motor Control Feedback
In motor control systems, the ISO7321CDR provides galvanic isolation for feedback signals such as encoder outputs and current sense signals. Its 25 kV/Β΅s CMTI ensures reliable operation in the presence of high dv/dt events from PWM switching. The 25 Mbps signaling rate supports high-resolution encoders, while the wide temperature range (-40Β°C to 125Β°C) suits industrial motor drives. The low power consumption reduces heat generation in the control board. The SOIC-8 package is compact, allowing integration into space-constrained motor controllers. The integrated noise filter helps reject EMI from the motor cables.
Recommended
Isolated Power Supply Monitoring
The ISO7321CDR is used in isolated power supply monitoring to transmit status signals such as power-good and fault indicators across the isolation barrier. Its 25 Mbps signaling rate allows fast transmission of alarm signals, while the 3000 Vrms isolation rating protects low-voltage control circuitry from high-voltage transients. The low power consumption (1.2 mA per channel at 3.3V) is ideal for always-on monitoring circuits. The default output high option ensures a safe state on power-up. The wide supply voltage range (3V to 5.5V) simplifies interfacing with various power management ICs.
Recommended
Medical Equipment Isolation
The ISO7321CDR provides galvanic isolation in medical equipment, protecting patients and operators from electrical hazards. Its 3000 Vrms isolation rating meets basic isolation requirements for many medical applications. The low power consumption is beneficial for battery-operated devices. The wide temperature range and robust EMC performance ensure reliable operation in clinical environments. The SOIC-8 package is suitable for compact medical devices. The integrated noise filter helps maintain signal integrity in the presence of electromagnetic interference from other medical equipment.
Recommended
Automotive Electronics
The ISO7321CDR is suitable for automotive electronics such as battery management systems and motor drives, where galvanic isolation is required between high-voltage and low-voltage domains. Its wide temperature range (-40Β°C to 125Β°C) and robust EMC performance meet automotive requirements. The 25 Mbps signaling rate supports high-speed communication between ECUs. The low power consumption reduces load on the vehicle's electrical system. The SOIC-8 package is compact for space-constrained automotive modules. The integrated noise filter ensures reliable operation in the electrically noisy automotive environment.
Recommended
Recommended Products Summary
Engineering reference data for ISO7321CDR β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ISO7321C | ISO7321FCDR | ISO7320CDR | ADuM1201 | Si8621 |
|---|---|---|---|---|---|---|
| Package | SOIC-8 (D) | SOIC-8 (D) | SOIC-8 (D) | SOIC-8 (D) | SOIC-8 (D) | SOIC-8 (D) |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Analog Devices | Silicon Labs |
| Number of Channels | 2 | 2 | 2 | 2 | 2 | 2 |
| Forward/Reverse Channels | 1/1 | 1/1 | 1/1 | 2/0 | 2/1 | 2/1 |
| Isolation Rating | 3000 Vrms | 3000 Vrms | 3000 Vrms | 3000 Vrms | 2500 Vrms | 2500 Vrms |
| Signaling Rate | 25 Mbps | 25 Mbps | 25 Mbps | 25 Mbps | 25 Mbps | 150 Mbps |
| CMTI | 25 kV/Β΅s | 25 kV/Β΅s | 25 kV/Β΅s | 25 kV/Β΅s | 25 kV/Β΅s | 35 kV/Β΅s |
| Supply Voltage Range | 3V to 5.5V | 3V to 5.5V | 3V to 5.5V | 3V to 5.5V | 3V to 5.5V | 2.5V to 5.5V |
Key Differentiators
- Low power consumption (vs Si8621)
- Integrated noise filter (vs ADuM1201)
- Default output high option (vs ISO7321FCDR)
Design Notes
For the ISO7321CDR, maintain adequate creepage and clearance distances on the PCB to preserve the 3000 Vrms isolation rating. A minimum of 4 mm creepage is recommended for 3000 Vrms, but consult the datasheet for specific requirements. Place decoupling capacitors (0.1 Β΅F) close to each VCC pin to ensure stable operation.
Keep the isolation barrier clear of copper traces and components to avoid reducing the isolation rating. Use a slot or cutout under the device if necessary to increase creepage distance. Route high-voltage and low-voltage traces on opposite sides of the PCB to minimize coupling.
Do not exceed the absolute maximum ratings for supply voltage (7V) or input/output voltages. Ensure that the input signals do not exceed the supply voltage by more than 0.5V. The default output high option means that if the input is left floating, the output will be high; use pull-down resistors if a defined low state is required.
Compliance Information
RoHS compliant per TI product page. Not AEC-Q100 qualified; for automotive-grade, consider ISO7721FQDWRQ1.
