Overview
The ISO7421EDR is a dual-channel digital isolator produced by Texas Instruments. This component provides galvanic isolation up to 2500 V RMS for 1 minute per UL 1577 and 4242 V PK per VDE, ensuring robust protection against noise and electrical interference. It features two isolated channels, each with a logic input and output buffer separated by a silicon dioxide (SiO2) insulation barrier. The device is designed to operate with isolated power supplies, preventing noise currents from affecting sensitive circuitry. The ISO7421EDR is particularly useful in applications requiring high-speed data transfer and reliable isolation between different voltage domains.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package | SOIC (D) | - |
| Pins | 8 | - |
| Operating Temperature Range | -40 to 125 | °C |
| Signaling Rate | > 50 Mbps | - |
| Supply Voltage (VCC1, VCC2) | 3 V to 5.5 V | V |
| Propagation Delay Time | 7 ns (Typical) | ns |
| Pulse Skew | 200 ps (Typical) | ps |
| Transient Immunity | 50 KV/μs (Typical) | KV/μs |
| Isolation Barrier Life | > 25 Years | - |
| Input Current per Channel (at 3.3 V, 1 Mbps) | 1.8 mA | mA |
| Input Current per Channel (at 3.3 V, 25 Mbps) | 2.8 mA | mA |
Key Features
- Low Power Consumption: Typical input current per channel is 1.8 mA at 1 Mbps and 2.8 mA at 25 Mbps when supplied from a 3.3-V source.
- Low Propagation Delay: 7 ns typical.
- Low Pulse Skew: 200 ps typical.
- Wide Operating Temperature Range: Specified from –40°C to 125°C.
- High Transient Immunity: 50 KV/μs typical.
- Long Isolation Barrier Life: > 25 years.
- Operates from 3-V to 5.5-V Supply Levels.
- 3.3-V and 5-V Level Translation.
- Narrow Body SOIC-8 Package.
- Safety and Regulatory Approvals: Compliant with UL 1577, VDE V 0884-10, DIN EN 61010-1, CSA Component Acceptance Notice 5A, IEC 60950-1, and IEC 61010-1 standards.
Applications
The ISO7421EDR is suitable for various applications requiring high-speed data isolation and protection against electrical noise and interference. These include:
- Industrial Automation: For isolating control signals and data in industrial environments.
- Medical Devices: To ensure safety and reliability in medical equipment by isolating sensitive circuits.
- Automotive Systems: For isolating signals in automotive electronics to prevent noise and interference.
- Power Supplies: To isolate feedback signals and other control signals in power supply designs.
- Test and Measurement Equipment: To provide reliable isolation in test and measurement instruments.
Q & A
- What is the primary function of the ISO7421EDR?
The ISO7421EDR is a dual-channel digital isolator that provides galvanic isolation between different voltage domains, protecting against noise and electrical interference. - What is the maximum signaling rate of the ISO7421EDR?
The maximum signaling rate is greater than 50 Mbps. - What is the operating temperature range of the ISO7421EDR?
The operating temperature range is from –40°C to 125°C. - How much current does the ISO7421EDR typically consume per channel at 1 Mbps and 3.3 V supply?
The typical input current per channel is 1.8 mA at 1 Mbps. - What is the propagation delay time of the ISO7421EDR?
The propagation delay time is typically 7 ns. - Does the ISO7421EDR support level translation between 3.3 V and 5 V?
Yes, it supports level translation between 3.3 V and 5 V. - What are the safety and regulatory approvals for the ISO7421EDR?
The device is compliant with UL 1577, VDE V 0884-10, DIN EN 61010-1, CSA Component Acceptance Notice 5A, IEC 60950-1, and IEC 61010-1 standards. - What is the typical transient immunity of the ISO7421EDR?
The typical transient immunity is 50 KV/μs. - How long is the isolation barrier life of the ISO7421EDR?
The isolation barrier life is greater than 25 years. - In what package is the ISO7421EDR available?
The ISO7421EDR is available in a narrow body SOIC-8 package.
