General Purpose Digital Isolator 5000Vpk 2 Channel 100Mbps 50kV/µs CMTI 8-SOIC (0.295", 7.50mm Width)
General Description
The STISO621WTR is a high-performance quad-channel isolated digital input interface IC from STMicroelectronics. It is designed to interface industrial digital inputs (such as PLC inputs) with low-voltage logic systems while providing galvanic isolation for improved safety and noise immunity.
This device integrates four independent input channels, each capable of handling high-voltage input signals, and converts them into isolated logic-level outputs. It is ideal for industrial automation, programmable logic controllers (PLCs), and factory control systems where robust signal isolation is required.
Key Features
Quad isolated digital input channels
High common-mode transient immunity (CMTI)
Wide input voltage range for industrial signals
Integrated current limiting and protection circuitry
Compatible with 3.3V and 5V logic outputs
Low power consumption
High noise immunity and ESD robustness
Complies with industrial safety standards
Electrical Characteristics
Number of Channels: 4
Isolation Type: Galvanic isolation
Input Voltage Range: Up to ~30 V (industrial input level)
Logic Output Voltage: 3.3 V / 5 V compatible
Propagation Delay: Typically low (tens of ns range)
Supply Voltage (Vcc): 3.0 V to 5.5 V
Operating Temperature Range: -40°C to +125°C
Functional Description
Each input channel accepts a high-voltage industrial signal and converts it into a corresponding isolated digital output. Internal circuitry provides:
Input current limiting
Signal conditioning
Isolation barrier
Output buffering
The isolation barrier protects low-voltage control electronics from high-voltage transients, ground loops, and electrical noise.
Package Information
Package Type: SO-16 (Wide body)
Mounting: Surface-mount (SMD)
Tape & Reel: Yes (TR suffix)
Pin Count: 16 pins
Applications
Programmable Logic Controllers (PLC)
Industrial I/O modules
Factory automation systems
Motor control interfaces
Process control equipment
Building automation
Advantages
Eliminates need for external optocouplers
Reduces PCB space and BOM cost
Improves system reliability
High-speed digital isolation vs traditional opto-isolators
Compliance & Standards
Industrial-grade reliability
ESD protection compliant
RoHS compliant
Manufacturer Information
Manufacturer: STMicroelectronics
Part Number: STISO621WTR
Series: STISO
