Overview
The ISO3086DW, produced by Texas Instruments, is a high-performance, isolated full-duplex RS-485 and RS-422 transceiver. This device is designed to meet or exceed the TIA/EIA RS-485 requirements, making it suitable for a wide range of industrial and commercial applications. The ISO3086DW features galvanic isolation between the bus-line transceiver and the logic-level interface, providing up to 2500 VRMS of isolation for 60 seconds per UL 1577. This isolation significantly enhances protection against electrical noise transients and reduces the risk of damage to sensitive control circuits.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Signaling Rate | - | - | 20 | Mbps |
| Operating Temperature | -40 | - | 85 | °C |
| Supply Voltage (VCC1, VCC2) | 3.15, 4.5 | - | 5.5, 5.5 | V |
| Driver Differential-Output Voltage Magnitude | 1.5 | 2.3 | - | V |
| Receiver Output Current | -8 | - | 8 | mA |
| Bus-Pin ESD Protection | - | - | 12 kV HBM (between bus pins and GND2), 6 kV HBM (between bus pins and GND1) | - |
| Isolation Rating | - | - | 2500 VRMS | - |
Key Features
- Meets or exceeds TIA/EIA RS-485 requirements
- Signaling rates up to 20 Mbps
- 1/8 unit load, supporting up to 256 nodes on a bus
- Thermal shutdown protection
- Low bus capacitance – 16 pF (typical)
- 50 kV/μs typical transient immunity
- Fail-safe receiver for bus open, short, idle conditions
- 3.3-V inputs are 5-V tolerant
- Bus-pin ESD protection – 12-kV HBM between bus pins and GND2, 6-kV HBM between bus pins and GND1
- Safety-related certifications: VDE, CSA, UL 1577, and more
Applications
- Security systems
- Chemical production
- Factory automation
- Motor and motion control
- HVAC and building automation networks
- Networked security stations
Q & A
- What is the maximum signaling rate of the ISO3086DW?
The ISO3086DW supports signaling rates up to 20 Mbps.
- What is the operating temperature range of the ISO3086DW?
The device operates from -40°C to +85°C.
- What is the isolation rating of the ISO3086DW?
The device provides up to 2500 VRMS of isolation for 60 seconds per UL 1577.
- Does the ISO3086DW support 3.3-V and 5-V logic levels?
- What kind of ESD protection does the ISO3086DW offer?
The device offers bus-pin ESD protection of 12 kV HBM between bus pins and GND2, and 6 kV HBM between bus pins and GND1.
- What are some of the safety-related certifications for the ISO3086DW?
The device is certified according to DIN EN IEC 60747-17 (VDE 0884-17), CSA 62368-1, and UL 1577, among others.
- How many nodes can be supported on a bus with the ISO3086DW?
The device supports up to 256 nodes on a bus due to its 1/8 unit load.
- What is the typical bus capacitance of the ISO3086DW?
The typical bus capacitance is 16 pF.
- Does the ISO3086DW have thermal shutdown protection?
- What are some common applications for the ISO3086DW?
