Overview
The ISO3086DWG4 from Texas Instruments is an isolated full-duplex differential line driver and receiver designed for TIA/EIA 485/422 applications. This device is part of the ISO308x family, which includes the ISO3080, ISO3082, ISO3086, and ISO3088. The ISO3086DWG4 is ideal for use in systems requiring high-speed data transmission over long distances, thanks to its galvanic isolation barrier that breaks the ground loop, allowing for a larger common-mode voltage range.
The device operates at signaling rates up to 20 Mbps and supports up to 256 nodes on a bus due to its 1/8 unit load. It features thermal shutdown protection, low bus capacitance, and high transient immunity, making it robust against electrical noise and transients.
The ISO3086DWG4 is qualified for use over a wide temperature range from –40°C to +85°C and meets various safety-related certifications, including UL 1577, CSA 62368-1, and DIN EN IEC 60747-17.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage (VCC1, VCC2) | -0.3 | 6 | V | |
| Operating Ambient Temperature (TA) | -40 | 85 | °C | |
| Signaling Rate | 20 | Mbps | ||
| Differential Output Voltage Magnitude (|VOD|) | 1.5 | 2.3 | V | |
| Isolation Voltage | 2500 | VRMS | ||
| Transient Immunity | 50 | kV/μs | ||
| Bus-Pin ESD Protection (HBM) | 12 | kV (between bus pins and GND2) | ||
| Bus-Pin ESD Protection (HBM) | 6 | kV (between bus pins and GND1) | ||
| Logic-Side Supply Current (ICC1) at 3.3V | 8 | mA | ||
| Bus-Side Supply Current (ICC2) at 5V | 15 | mA |
Key Features
- Meets or exceeds TIA/EIA RS-485 requirements
- Signaling rates up to 20 Mbps
- 1/8 unit load – supports 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
- 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: UL 1577, CSA 62368-1, DIN EN IEC 60747-17
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 ISO3086DWG4?
The maximum signaling rate is up to 20 Mbps.
- How many nodes can be supported on a bus with the ISO3086DWG4?
Up to 256 nodes can be supported due to its 1/8 unit load.
- What is the isolation voltage of the ISO3086DWG4?
The isolation voltage is 2500 VRMS.
- What are the operating temperature ranges for the ISO3086DWG4?
The device operates from –40°C to +85°C.
- Does the ISO3086DWG4 have ESD protection?
- What safety certifications does the ISO3086DWG4 meet?
- Is the ISO3086DWG4 suitable for use in harsh environments?
- Can the ISO3086DWG4 be used in systems requiring high-speed data transmission?
- What is the typical bus capacitance of the ISO3086DWG4?
- Are the inputs of the ISO3086DWG4 5-V tolerant?
