Overview
The ISO7421DR from Texas Instruments is a dual-channel digital isolator designed to provide galvanic isolation between two circuits. This component is housed in an 8-pin SOIC (D) package and is suitable for a wide range of applications requiring high-speed data transfer and isolation. The ISO7421DR operates over a temperature range of –40°C to 125°C, making it suitable for harsh environments. It is used in conjunction with isolated power supplies 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 | Up to 1 Mbps | - |
| Propagation Delay | 9 ns (Typical) | ns |
| Skew | 300 ps (Typical) | ps |
| Transient Immunity | 50 kV/μs (Typical) | kV/μs |
| Isolation Voltage | 2500 V RMS for 1 minute per UL 1577 | V RMS |
| Supply Voltage | 3.3 V and 5 V | V |
| Supply Current (VCC1) | 1.5 mA (Typical) at 3.3 V | mA |
| Supply Current (VCC2) | 3.5 mA (Typical) at 3.3 V | mA |
Key Features
- Highest Signaling Rate: Up to 1 Mbps
- Low Power Consumption: Typical supply current of 1.5 mA per channel at 3.3 V operation
- Low Propagation Delay: 9 ns Typical
- Low Skew: 300 ps Typical
- Wide Temperature Range: –40°C to 125°C (M-Grade)
- High Transient Immunity: 50 kV/μs Typical
- Over 25-Year Isolation Integrity at Rated Voltage
- Operates From 3.3-V and 5-V Supply and Logic Levels
- 3.3-V and 5-V Level Translation
- Narrow Body SOIC-8 Package
- Safety and Regulatory Approvals: 4242 VPK Isolation per DIN V VDE V 0884-10, 2500 VRMS Isolation for 1 minute per UL 1577, CSA Component Acceptance Notice 5A, IEC 60950-1 and IEC 61010-1 Standards, CQC Certification per GB4943.1-2011
Applications
- Optocoupler Replacement
- Industrial Fieldbus: Profibus, Modbus, DeviceNet™
- Data Buses
- Servo Control Interface
- Motor Control
- Power Supplies
- Battery Packs
Q & A
- What is the maximum signaling rate of the ISO7421DR?
The ISO7421DR has a maximum signaling rate of up to 1 Mbps.
- What is the typical propagation delay of the ISO7421DR?
The typical propagation delay is 9 ns.
- What are the operating temperature ranges for the ISO7421DR?
The operating temperature range is –40°C to 125°C.
- What are the supply voltage options for the ISO7421DR?
The ISO7421DR operates from 3.3-V and 5-V supply and logic levels.
- What is the isolation voltage rating of the ISO7421DR?
The isolation voltage rating is 2500 V RMS for 1 minute per UL 1577.
- Does the ISO7421DR support level translation?
Yes, it supports 3.3-V and 5-V level translation.
- What are the safety and regulatory approvals for the ISO7421DR?
The device has approvals such as 4242 VPK Isolation per DIN V VDE V 0884-10, 2500 VRMS Isolation for 1 minute per UL 1577, CSA Component Acceptance Notice 5A, IEC 60950-1 and IEC 61010-1 Standards, and CQC Certification per GB4943.1-2011.
- What is the typical supply current for the ISO7421DR at 3.3 V operation?
The typical supply current is 1.5 mA per channel at 3.3 V operation.
- What kind of package does the ISO7421DR come in?
The ISO7421DR comes in a narrow body SOIC-8 package.
- What are some common applications of the ISO7421DR?
Common applications include optocoupler replacement, industrial fieldbus, data buses, servo control interface, motor control, power supplies, and battery packs.
