Overview
The ISO1541D, produced by Texas Instruments, is a low-power, bidirectional I2C isolator designed to provide isolated communication between two different voltage domains. This device utilizes Texas Instruments' Capacitive Isolation technology, which employs a silicon dioxide (SiO2) barrier to separate the logic input and output buffers. This technology offers advantages in terms of function, performance, size, and power consumption compared to traditional optocouplers. The ISO1541D is particularly useful in applications requiring isolated I2C interfaces, such as in systems where high voltages, ground isolation, and noise protection are critical.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Number of Channels | 2 | |
| Maximum Data Rate | 1 Mbps | |
| Package Type | SOIC (D) | |
| Number of Pins | 8 | |
| Mounting Type | Surface Mount | |
| Minimum Operating Temperature | -40°C | |
| Maximum Operating Temperature | +125°C | |
| Supply Voltage Range | 3 V to 5.5 V | |
| Output Current (Side 1) | 0.5 mA to 3.5 mA | |
| Output Current (Side 2) | 0.5 mA to 35 mA | |
| Isolation Voltage | 2500 Vrms | |
| Transient Immunity | ±50 kV/µs (Typical) | |
| HBM ESD Protection | 4 kV on all pins; 8 kV on bus pins |
Key Features
- Isolated bidirectional I2C compatible communication
- Supports up to 1-MHz operation
- 3-V to 5.5-V supply range
- Open-drain outputs with 3.5-mA sink current capability on Side 1 and 35-mA on Side 2
- Operating temperature range: –40°C to +125°C
- ±50-kV/µs transient immunity (Typical)
- HBM ESD protection of 4 kV on all pins; 8 kV on bus pins
- Safety-related certifications: 4242-VPK isolation per DIN EN IEC 60747-17, 2500-Vrms isolation for 1 minute per UL 1577, CSA approval per IEC 62368-1, and CQC basic insulation per GB4943.1-2011
Applications
- Isolated I2C buses
- SMBus and PMBus interfaces
- Open-drain networks
- Motor control systems
- Battery management systems
- I2C level shifting
Q & A
- What is the primary function of the ISO1541D?
The ISO1541D is a low-power, bidirectional I2C isolator that provides isolated communication between two different voltage domains.
- What is the maximum data rate supported by the ISO1541D?
The ISO1541D supports up to 1-Mbps data rate.
- What is the operating temperature range of the ISO1541D?
The operating temperature range is –40°C to +125°C.
- What type of package does the ISO1541D come in?
The ISO1541D comes in an 8-pin SOIC (D) package.
- What is the isolation voltage of the ISO1541D?
The isolation voltage is 2500 Vrms.
- Does the ISO1541D have any safety-related certifications?
Yes, it has certifications such as 4242-VPK isolation per DIN EN IEC 60747-17, 2500-Vrms isolation for 1 minute per UL 1577, CSA approval per IEC 62368-1, and CQC basic insulation per GB4943.1-2011.
- What is the transient immunity of the ISO1541D?
The transient immunity is ±50 kV/µs (Typical).
- What kind of ESD protection does the ISO1541D offer?
The ISO1541D offers HBM ESD protection of 4 kV on all pins and 8 kV on bus pins.
- In what applications is the ISO1541D commonly used?
It is commonly used in isolated I2C buses, SMBus and PMBus interfaces, open-drain networks, motor control systems, battery management systems, and I2C level shifting.
- How does the ISO1541D differ from the ISO1540?
The ISO1541D has a bidirectional data channel and a unidirectional clock channel, whereas the ISO1540 has two bidirectional channels for both clock and data lines.
