Texas Instruments Unveils ISO1540 and ISO1541 Bidirectional Isolators

Texas Instruments ISO1540 and ISO1541 bidirectional isolators

Texas Instruments announced their ISO1540 and ISO1541 bidirectional isolators. The ISO1540 and ISO1541 consume up to 38% lower power than competitive devices. The devices can replace a typical implementation of 16 or more discrete devices to isolate the I2C signal in industrial applications. The ISO1540 and ISO1541 are available in industry-standard, 8-pin SOIC packages. The ICs are priced at $2.00 and US$1.80, respectively in 1,000-unit quantities.

The TI ISO1540 and ISO1541 can can replace a typical implementation of 16 or more discrete devices to isolate the I2C signal in industrial applications. In addition, the devices offer better transient immunity and faster switching times than optocouplers. This performance provides longer-lasting isolation in a variety of applications, such as power supplies, networking, telecommunications, Power over Ethernet (PoE) and battery management systems.

The ISO1540 and ISO1541 feature a unique capacitive isolation technology with a silicon dioxide barrier (SiO2) to separate logic input and output buffers. This approach extends the lifetime of the isolators by more than three times compared to optocouplers or magnetic isolators. The ISO1540 provides two isolated bidirectional channels for clock and data lines for use in applications that have multiple masters. The ISO1541 includes a bidirectional data and a unidirectional clock channel for use in single-master applications.

TI ISO1540 and ISO1541 Bidirectional Isolators Features

  • Isolated Bidirectional, I2C Compatible, Communications
  • Supports up to 1 MHz Operation
  • 3-V to 5.5-V Supply Range
  • Open Drain Outputs with 3.5-mA Side 1 and 35-mA Side 2 Sink Current Capability
  • -40°C to 125°C Operating Temperature
  • ±50 kV/µs Transient Immunity (Typical)
  • HBM ESD Protection of 4 kV on All Pins; 8 kV on Bus Pins

More info: Texas Instruments ISO1540 and ISO1541 Low-Power Bidirectional I2C Isolators (pdf)