Texas Instruments ISO7021 Ultra-Low Power Digital Isolator
Texas Instruments ISO7021 Ultra-Low Power Multi-Channel Digital Isolator can be used to isolate CMOS or LVCMOS digital I/Os. Each isolation channel has a logic input and output buffer separated by a double capacitive silicon dioxide (SiO2) insulation barrier. Innovative edge-based architecture combined with an ON-OFF keying modulation scheme allows these isolators to consume very low power while meeting a 3000VRMS isolation rating per UL1577. The per-channel dynamic current consumption of the device is under 120µA/Mbps. The per-channel static current consumption is 4.8µA at 3.3V, allowing for the use of the ISO7021 in both power and thermal-constrained system designs.
The Texas Instruments ISO7021 Ultra-Low Power Digital Isolator can operate as low as 1.71V and as high as 5.5V and is fully functional with different supply voltages on each side of the isolation barrier. The two-channel isolator comes in a narrow-body 8-SOIC package with one forward and one reverse-direction channel in an 8-SOIC package. The device has default high and low output options. If the input power or signal is lost, the default output is high for the ISO7021 device without the suffix F and low for the ISO7021F device with the F suffix.
Features
- Ultra-low power consumption
- 4.8µA per channel quiescent current (3.3V)
- 15µA per channel at 100kbps (3.3V)
- 120µA per channel at 1Mbps (3.3V)
- Robust isolation barrier
- >100-year projected lifetime
- 3000VRMS isolation rating
- ±100kV/µs typical CMTI
- 1.71V to 1.89V and 2.25V to 5.5V wide supply range
- –55°C to +125°C wide temperature range
- Small 8-SOIC package (8-D)
- Up to 4Mbps signaling rate
- Default output High (ISO7021) and Low (ISO7021F) options
- Robust electromagnetic compatibility (EMC)
- System-level ESD, EFT, and surge immunity
- ±8kV IEC 61000-4-2 contact discharge protection across the isolation barrier
- Very low emissions
- Safety-related certifications (planned)
- UL 1577 Component Recognition Program
- DIN V VDE V 0884-11
- CQC, TUV, and CSA certifications
Applications
- 4mA to 20mA loop-powered field transmitters
- Factory automation, process automation
- Low-power GPIO, UART isolation
Simplified Application Schematic
Related Development Tool
Texas Instruments DIGI-ISO-EVM Digital Isolator Evaluation Module
For TI single-channel, dual-channel, triple-channel, quad-channel, or six-channel digital isolators.
Texas Instruments ISO7041DBQEVM Isolator Evaluation Module (EVM)
Used to evaluate the ISO7041 low-power quad channel digital isolator in a 16-pin SSOP package.