Overview
The ISO7021DR, produced by Texas Instruments, is an ultra-low power, two-channel digital isolator designed for applications requiring high isolation and low power consumption. This device features a double capacitive silicon dioxide (SiO2) insulation barrier, providing a 3000 VRMS isolation rating as per UL 1577. The innovative edge-based architecture and ON-OFF keying modulation scheme enable the isolator to consume very low power, making it suitable for power and thermally constrained system designs.
The ISO7021DR operates over a wide supply voltage range from 1.71V to 5.5V and can function with different supply voltages on each side of the isolation barrier. It is certified for safety-related standards including DIN EN IEC 60747-17, UL 1577, IEC 62368-1, and IEC 61010-1, as well as ATEX and IECEx certifications.
Key Specifications
| Parameter | Min | Max | Unit | |
|---|---|---|---|---|
| Supply Voltage (VCC1, VCC2) | -0.5 | 6 | V | |
| Input/Output Voltage | -0.5 | VCCX + 0.5 | V | |
| Quiescent Current per Channel (3.3V) | 4.8 | 7.8 | μA | |
| Dynamic Current per Channel at 100kbps (3.3V) | 15 | 23 | μA | |
| Dynamic Current per Channel at 1Mbps (3.3V) | 120 | 153 | μA | |
| Ambient Temperature | -55 | 125 | °C | |
| Maximum Isolation Voltage | 3000 | VRMS |
Key Features
- Ultra-low power consumption: 4.8μA per channel quiescent current at 3.3V and up to 120μA per channel at 1Mbps.
- High isolation rating: 3000 VRMS as per UL 1577.
- Wide supply voltage range: 1.71V to 5.5V, with independent supply voltages on each side of the isolation barrier.
- Safety-related certifications: DIN EN IEC 60747-17, UL 1577, IEC 62368-1, IEC 61010-1, and ATEX and IECEx certifications).
- Low emissions and high common-mode transient immunity (CMTI) of up to 100 kV/μs).
- Operating temperature range: -55°C to 125°C).
Applications
- 4mA to 20mA loop powered field transmitters).
- Factory automation and process automation).
- Low-power GPIO and UART isolation).
Q & A
- What is the primary function of the ISO7021DR?
The ISO7021DR is an ultra-low power, two-channel digital isolator designed to isolate CMOS or LVCMOS digital I/Os while providing high isolation and low power consumption).
- What are the key safety certifications of the ISO7021DR?
The device is certified according to DIN EN IEC 60747-17, UL 1577, IEC 62368-1, IEC 61010-1, and it also holds ATEX and IECEx certifications).
- What is the maximum isolation voltage of the ISO7021DR?
The maximum isolation voltage is 3000 VRMS as per UL 1577).
- What is the operating temperature range of the ISO7021DR?
The device operates over a temperature range of -55°C to 125°C).
- What are the typical quiescent and dynamic current consumptions of the ISO7021DR?
The quiescent current is 4.8μA per channel at 3.3V, and the dynamic current is up to 120μA per channel at 1Mbps).
- What are some common applications of the ISO7021DR?
Common applications include 4mA to 20mA loop powered field transmitters, factory automation, process automation, and low-power GPIO and UART isolation).
- What is the supply voltage range for the ISO7021DR?
The device operates over a supply voltage range from 1.71V to 5.5V, with independent supply voltages possible on each side of the isolation barrier).
- How does the ISO7021DR achieve low power consumption?
The device uses an innovative edge-based architecture combined with an ON-OFF keying modulation scheme to achieve very low power consumption).
- What is the common-mode transient immunity (CMTI) of the ISO7021DR?
The CMTI is up to 100 kV/μs).
- In what package is the ISO7021DR available?
The device is available in a narrow body 8-SOIC package).
