Overview
The ISO7421FED is a dual-channel digital isolator produced by Texas Instruments. This device 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 interference. The ISO7421FED features two isolated channels, each with a logic input and output buffer separated by a silicon dioxide (SiO2) insulation barrier. It is designed to operate with isolated power supplies to prevent noise currents from affecting sensitive circuitry. The device is available in a narrow body SOIC-8 package and supports a wide operating temperature range of –40°C to 125°C.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package | SOIC (D) | - |
| Pins | 8 | - |
| Operating Temperature Range | –40 to 125 | °C |
| Signaling Rate | > 50 Mbps | - |
| Default Output | 'Low' for devices with suffix 'F' | - |
| Power Consumption (3.3-V Supplies) | 1.8 mA at 1 Mbps, 2.8 mA at 25 Mbps | mA |
| Propagation Delay | 7 ns Typical | ns |
| Pulse Skew | 200 ps Typical | ps |
| Transient Immunity | 50-KV/μs Typical | - |
| Isolation Barrier Life | > 25 Years | - |
| Supply Voltage Range | 3-V to 5.5-V | V |
| Level Translation | 3.3-V and 5-V | - |
| Isolation Voltage | 2500 V RMS for 1 minute per UL 1577 | V RMS |
| Safety and Regulatory Approvals | UL 1577, VDE V 0884-10, DIN EN 61010-1, CSA, IEC 60950-1, IEC 61010-1, CQC Certification per GB4943.1-2011 | - |
Key Features
- Signaling Rate > 50 Mbps
- Default Output 'Low' and 'High' Options depending on the suffix
- Low Power Consumption: 1.8 mA at 1 Mbps, 2.8 mA at 25 Mbps (3.3-V Supplies)
- Low Propagation Delay: 7 ns Typical
- Low Pulse Skew: 200 ps Typical
- Wide Operating Temperature Range: –40°C to 125°C
- 50-KV/μs Transient Immunity, Typical
- 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: UL 1577, VDE V 0884-10, DIN EN 61010-1, CSA, IEC 60950-1, IEC 61010-1, CQC Certification per GB4943.1-2011
Applications
The ISO7421FED is suitable for various applications requiring high-speed data transmission and galvanic isolation, such as:
- Industrial Automation and Control Systems
- Medical Devices and Equipment
- Aerospace and Defense Systems
- Automotive Systems (though not specifically automotive qualified)
- Communication and Networking Equipment
- Power Supplies and DC-DC Converters
These devices are particularly useful in scenarios where noise isolation and high-speed data transfer are critical, such as in mixed signal micro-controller, digital-to-analog converter, transformer driver, and voltage regulator applications.
Q & A
- What is the signaling rate of the ISO7421FED?
The signaling rate of the ISO7421FED is greater than 50 Mbps.
- What is the default output state of the ISO7421FED in case of input power or signal loss?
The default output state is 'low' for devices with the suffix 'F'.
- What is the typical power consumption of the ISO7421FED at 3.3-V supplies?
The typical power consumption is 1.8 mA at 1 Mbps and 2.8 mA at 25 Mbps.
- What is the propagation delay of the ISO7421FED?
The propagation delay is typically 7 ns.
- What is the isolation voltage rating of the ISO7421FED?
The isolation voltage rating is 2500 V RMS for 1 minute per UL 1577 and 4242 V PK per VDE.
- What are the safety and regulatory approvals for the ISO7421FED?
The device complies with UL 1577, VDE V 0884-10, DIN EN 61010-1, CSA, IEC 60950-1, IEC 61010-1, and CQC Certification per GB4943.1-2011.
- What is the operating temperature range of the ISO7421FED?
The operating temperature range is –40°C to 125°C.
- Does the ISO7421FED support level translation?
Yes, it supports 3.3-V and 5-V level translation.
- What is the package type and pin count of the ISO7421FED?
The device is packaged in a narrow body SOIC-8 package with 8 pins.
- Is the ISO7421FED automotive qualified?
No, the ISO7421FED is not specifically automotive qualified.[
