Overview
The ISO7321CDR is a low-power, dual-channel digital isolator produced by Texas Instruments. This component provides galvanic isolation up to 3000 V RMS for 1 minute per UL 1577 and 4242 V PK per DIN V VDE V 0884-10 and DIN EN 61010-1. It features two isolated channels, each comprising logic input and output buffers separated by silicon dioxide (SiO2) insulation barriers. The ISO7321C has the two channels in opposite directions, making it suitable for various industrial and communication applications. The device operates from 3.3 V and 5 V supply levels and is designed to prevent noise currents from interfering with sensitive circuitry.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package | SOIC (D) | - |
| Pins | 8 | - |
| Operating Temperature Range | -40 to 125 | °C |
| Signaling Rate | 25 | Mbps |
| Low Power Consumption (Typical ICC per Channel at 1 Mbps) | 1.2 mA (5 V), 0.9 mA (3.3 V) | mA |
| Propagation Delay (Typical at 5V Supplies) | 33 ns | ns |
| Transient Immunity (Typical at 5V Supplies) | 65 kV/μs | kV/μs |
| Isolation Voltage | 3000 V RMS for 1 minute per UL 1577, 4242 V PK per VDE | V |
| Supply Voltage | 3 V to 5.5 V | V |
| Storage Temperature | -65 to 150 | °C |
Key Features
- Integrated noise filters for harsh industrial environments
- Default output high and low options depending on the device suffix
- Low power consumption with typical ICC per channel at 1 Mbps: 1.2 mA (5 V), 0.9 mA (3.3 V)
- Low propagation delay: 33 ns typical at 5V supplies
- 3.3 V and 5 V level translation
- Wide temperature range: -40°C to 125°C
- Robust electromagnetic compatibility (EMC) and system-level ESD, EFT, and surge immunity
- Low emissions and high isolation barrier life (> 25 years)
- Narrow body SOIC-8 package
- Safety and regulatory approvals: UL 1577, VDE V 0884-10, DIN EN 61010-1, CSA, IEC 60950-1, and CQC certification
Applications
- Opto-coupler replacement in industrial fieldbus systems (e.g., ProfiBus, ModBus, DeviceNet)
- Servo control interfaces
- Motor control systems
- Power supplies and battery packs
- Data buses and communication systems requiring high isolation and low noise
Q & A
- What is the primary function of the ISO7321CDR?
The ISO7321CDR is a dual-channel digital isolator that provides galvanic isolation between two logic input and output buffers, preventing noise currents from interfering with sensitive circuitry.
- What are the operating supply voltage ranges for the ISO7321CDR?
The device operates from 3 V to 5.5 V supply levels.
- What is the maximum isolation voltage of the ISO7321CDR?
The maximum isolation voltage is 3000 V RMS for 1 minute per UL 1577 and 4242 V PK per VDE.
- What is the typical propagation delay of the ISO7321CDR?
The typical propagation delay is 33 ns at 5V supplies.
- Does the ISO7321CDR have integrated noise filters?
- What are the default output options for the ISO7321CDR?
The default output is low for devices with the suffix 'F' and high for devices without the suffix 'F' in case of input power or signal loss.
- What are the safety and regulatory approvals for the ISO7321CDR?
The device has approvals from UL 1577, VDE V 0884-10, DIN EN 61010-1, CSA, IEC 60950-1, and CQC certification.
- What is the typical power consumption of the ISO7321CDR?
The typical power consumption is 1.2 mA (5 V) and 0.9 mA (3.3 V) per channel at 1 Mbps.
- What is the temperature range for the ISO7321CDR?
The operating temperature range is -40°C to 125°C.
- What package type is the ISO7321CDR available in?
The device is available in a narrow body SOIC-8 package.
