Overview
The ISO3082DWRG4, produced by Texas Instruments, is an isolated half-duplex differential line transceiver designed for TIA/EIA 485/422 applications. This device is part of the ISO308x family, which includes full- and half-duplex transceivers. The ISO3082DWRG4 is ideal for use in applications requiring high isolation and robustness against electrical noise and transients.
It features a symmetrical isolation barrier that provides 2500 VRMS of isolation for 60 seconds, as per UL 1577, between the bus-line transceiver and the logic-level interface. This isolation significantly increases protection and reduces the risk of damage to expensive control circuits. The device operates over a wide temperature range from –40°C to +85°C.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Signaling Rate | - | 20 | - | Mbps |
| Bus Input Current (VA or VB = 12 V, Other input at 0 V) | 0.04 | 0.1 | 0.13 | mA |
| Output High-Impedance Current (VI = –7 to 12 V, Other input = 0 V) | -1 | - | 1 | µA |
| Low-Level Output Voltage (VID = –200 mV, IO = 8 mA, 3.3 V VCC1) | 0.15 | - | 0.4 | V |
| Low-Level Output Voltage (VID = –200 mV, IO = 8 mA, 5 V VCC1) | 0.15 | - | 0.4 | V |
| Isolation Voltage (VRMS for 60 s) | - | - | 2500 | V |
| Operating Temperature Range | -40 | - | 85 | °C |
| ESD Protection (HBM between bus pins and GND2) | - | - | 12 | kV |
| ESD Protection (HBM between bus pins and GND1) | - | - | 6 | kV |
Key Features
- Meets or exceeds TIA/EIA RS-485 requirements.
- Signaling rates up to 20 Mbps.
- 1/8 unit load – 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: 4000-VPK basic insulation, 560 VPK VIORM per DIN EN IEC 60747-17 (VDE 0884-17), 2500 VRMS isolation per UL 1577, 4000 VPK isolation per CSA 62368-1.
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 ISO3082DWRG4?
The ISO3082DWRG4 supports signaling rates up to 20 Mbps.
- How many nodes can be supported on a bus using the ISO3082DWRG4?
The device supports up to 256 nodes on a bus due to its 1/8 unit load.
- What is the isolation voltage rating of the ISO3082DWRG4?
The device has an isolation voltage rating of 2500 VRMS for 60 seconds as per UL 1577.
- What are the operating temperature ranges for the ISO3082DWRG4?
The device operates over a temperature range from –40°C to +85°C.
- Does the ISO3082DWRG4 have ESD protection?
Yes, it has bus-pin ESD protection of 12-kV HBM between bus pins and GND2, and 6-kV HBM between bus pins and GND1.
- Is the ISO3082DWRG4 suitable for use in safety-critical applications?
Yes, it has various safety-related certifications including 4000-VPK basic insulation and 2500 VRMS isolation per UL 1577.
- What are some common applications for the ISO3082DWRG4?
Common applications include security systems, chemical production, factory automation, motor and motion control, HVAC and building automation networks, and networked security stations.
- Does the ISO3082DWRG4 have thermal shutdown protection?
Yes, the device includes thermal shutdown protection.
- Is the ISO3082DWRG4 compatible with 3.3-V and 5-V systems?
Yes, the 3.3-V inputs are 5-V tolerant.
- What is the typical transient immunity of the ISO3082DWRG4?
The device has a typical transient immunity of 50 kV/μs.
