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Product Attributes

Introduction

The CA-IS309x series are isolated half-duplex RS-485 transceivers with an integrated isolated DC-DC converter, eliminating the need for an external isolated power supply. The devices feature SiO₂ insulating barrier isolation between the logic-side input and output buffers, and operate from a single 5V or 3.3V supply, delivering a highly integrated signal and power isolation RS-485 solution. The insulating barrier breaks the ground loop between the logic side and bus side, helping to reduce noise caused by high ground potential differences between ports and ensuring reliable data transmission.

The CA-IS309x series supports multi-node data communication. The bus pins feature ±20kV HBM ESD protection, capable of withstanding high-level ESD events and protecting internal circuitry from damage. The receiver input impedance is 1/8 unit load, allowing up to 256 transceivers to be connected on the same bus. The CA-IS309x series also offers a variant (CA-IS309xVW) with independent DC-DC converter and RS-485 transceiver power supplies, facilitating signal interfacing between the logic side and low-voltage control circuits.

The CA-IS309x is available in a 16-pin wide-body SOIC package and supports an industrial extended temperature range of -40°C to 125°C.

Features

• RS-485 transceiver meeting or exceeding TIA/EIA-485A standard
• CA-IS3092: 0.5Mbps; CA-IS3098: 20Mbps
• 1/8 unit load, supports up to 256 bus nodes
• 5V or 3.3V logic-side supply; available in versions with independent DC-DC converter and RS-485 transceiver power supplies
• Integrated low-emission isolated DC-DC converter for bus-side power supply
• Selectable 3.3V or 5V output voltage (V₁₅₀ ≤ VCC)
• Highly integrated: built-in transformer
• Soft-start suppresses input inrush current
• Integrated overload and short-circuit protection
• Built-in thermal protection
• High common-mode transient immunity: ±150kV/μs (typical)
• Bus I/O ESD protection: ±20kV HBM ESD
• Current-limiting driver with thermal shutdown
• Open, short-circuit, and idle bus fail-safe protection
• Operating temperature range: -40°C to 125°C
• 16-pin wide-body SOIC package
• Isolation barrier lifetime greater than 40 years at rated operating voltage
• Safety certifications: VDE certified per DIN EN IEC60747-17 (VDE 0884-17):2021-10; UL certified per UL 1577; CQC certified per GB4843.1-2022; TUV certified per EN61010-1:2010+A1

Applications

• Isolated RS-485 communication interface
• Factory automation
• Photovoltaic inverters
• Building automation
• Motor drives