Overview
The ISO7742DBQ from Texas Instruments is a high-performance, quad-channel digital isolator designed to provide robust galvanic isolation between two independent circuits. This device is part of the ISO774x family, known for its enhanced electromagnetic compatibility (EMC) and safety features. The ISO7742DBQ is particularly suited for applications requiring reliable and high-speed data transfer across isolated domains.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage (VCC1, VCC2) | -0.5 to 6 | V |
| Junction Temperature (TJ) | -65 to 150 | °C |
| Storage Temperature (Tstg) | -65 to 150 | °C |
| Data Rate | Up to 100 Mbps | |
| Maximum Power Dissipation (both sides) | 210 mW | mW |
| Maximum Working Isolation Voltage | 1500 VRMS | VRMS |
| Maximum Transient Isolation Voltage | 8000 VPK | VPK |
| Surge Capability | Up to 12.8 kV | kV |
| Common-Mode Transient Immunity (CMTI) | ±100 kV/μs typical | kV/μs |
| Package Options | 16-pin SOIC-WB (DW) and QSOP (DBQ) |
Key Features
- Robust Isolation Barrier: >100-year projected lifetime at 1500 VRMS working voltage, up to 5000 VRMS isolation rating, and up to 12.8 kV surge capability.
- High-Speed Data Transfer: Up to 100 Mbps data rate.
- Wide Supply Range: 2.25 V to 5.5 V, with 2.25-V to 5.5-V level translation.
- Low Power Consumption: Typical 1.5 mA per channel at 1 Mbps.
- Low Propagation Delay: 10.7 ns typical (5-V supplies).
- Robust EMC: System-level ESD, EFT, and surge immunity, ±8 kV IEC 61000-4-2 contact discharge protection across the isolation barrier.
- Enable Pins: For putting the respective outputs in high impedance, suitable for multi-master driving applications and reducing power consumption.
- Default Output States: High for devices without the F suffix and low for devices with the F suffix if the input power or signal is lost.
- Safety Certifications: Certified to various safety standards including VDE, UL, and TUV for both DW and DBQ packages.
Applications
- Industrial Automation: For isolating control signals in industrial automation systems.
- Medical Devices: To ensure patient safety by isolating medical device circuits.
- Automotive Systems: The ISO774x-Q1 version is available for automotive applications, ensuring compliance with automotive safety standards.
- Power Supplies and DC-DC Converters: For isolating feedback signals and control circuits in power supplies and DC-DC converters.
- Test and Measurement Equipment: To isolate measurement circuits from the rest of the system.
Q & A
- What is the maximum data rate of the ISO7742DBQ?
The ISO7742DBQ supports data rates up to 100 Mbps.
- What is the projected lifetime of the isolation barrier?
The isolation barrier has a projected lifetime of more than 100 years at 1500 VRMS working voltage.
- What are the package options for the ISO7742DBQ?
The device is available in 16-pin SOIC-WB (DW) and QSOP (DBQ) packages.
- What is the typical common-mode transient immunity (CMTI) of the ISO7742DBQ?
The CMTI is ±100 kV/μs typical.
- What is the maximum working isolation voltage of the ISO7742DBQ?
The maximum working isolation voltage is 1500 VRMS.
- Does the ISO7742DBQ have any safety certifications?
Yes, it is certified to various safety standards including VDE, UL, and TUV.
- What is the typical propagation delay of the ISO7742DBQ?
The typical propagation delay is 10.7 ns at 5-V supplies.
- How does the ISO7742DBQ handle power loss or signal loss?
If the input power or signal is lost, the default output is high for devices without the F suffix and low for devices with the F suffix.
- What are the enable pins used for in the ISO7742DBQ?
The enable pins can be used to put the respective outputs in high impedance, which is useful for multi-master driving applications and reducing power consumption.
- Is there an automotive version of the ISO7742DBQ available?
Yes, the ISO774x-Q1 version is available for automotive applications.
