Overview
The ISO7221AD is a dual-channel digital isolator produced by Texas Instruments. This device is part of the ISO7220x and ISO7221x family, designed to provide galvanic isolation between logic input and output buffers. The channels in the ISO7221x series are oriented in opposite directions, facilitating flexible PCB layout. The device uses TI’s silicon-dioxide (SiO2) isolation barrier, offering up to 4000VPK of isolation per VDE standards. It is used in conjunction with isolated power supplies to block high voltages, isolate grounds, and prevent noise currents from interfering with sensitive circuitry.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package | SOIC (D) | |
| Pins | 8 | |
| Operating Temperature Range | -40 to 125 | °C |
| Signaling Rate Options | 1, 5, 25, 150 Mbps | |
| Channel-to-Channel Output Skew | 1 ns Max | |
| Pulse-Width Distortion (PWD) | 1 ns Max | |
| Jitter Content | 1 ns Typ at 150 Mbps | |
| Transient Immunity | 50 kV/μs Typ | |
| Supply Voltages | 2.8V (C-Grade), 3.3V, 5V | |
| ESD Protection | 4 kV | |
| Electromagnetic Immunity | High | |
| Isolation Voltage | 4000 VPK | |
| Lifetime at Rated Voltage | Typical 28 Years |
Key Features
- 1, 5, 25, and 150 Mbps signaling rate options
- Low channel-to-channel output skew; 1 ns Max
- Low pulse-width distortion (PWD); 1 ns Max
- Low jitter content; 1 ns Typ at 150 Mbps
- 50 kV/μs typical transient immunity
- Operates with 2.8V (C-Grade), 3.3V, or 5V supplies
- 4 kV ESD protection
- High electromagnetic immunity
- –40°C to +125°C operating range
- Typical 28-year life at rated voltage
- Safety-related certifications: DIN EN IEC 60747-17 (VDE 0884-17), UL 1577, IEC 61010-1, IEC 62368-1
Applications
- Factory Automation: Modbus, Profibus™, DeviceNet™ data buses
- Computer Peripheral Interface
- Servo Control Interface
- Data Acquisition
Q & A
- What is the ISO7221AD used for?
The ISO7221AD is a dual-channel digital isolator used to provide galvanic isolation between logic input and output buffers, protecting sensitive circuitry from high voltages and noise currents.
- What are the signaling rate options for the ISO7221AD?
The ISO7221AD supports signaling rates of 1, 5, 25, and 150 Mbps.
- What is the operating temperature range of the ISO7221AD?
The device operates over an ambient temperature range of –40°C to +125°C.
- What supply voltages does the ISO7221AD support?
The device operates with 2.8V (C-Grade), 3.3V, or 5V supplies.
- What is the ESD protection level of the ISO7221AD?
The device has 4 kV ESD protection.
- What safety certifications does the ISO7221AD have?
The device has certifications such as DIN EN IEC 60747-17 (VDE 0884-17), UL 1577, IEC 61010-1, and IEC 62368-1.
- What is the typical lifetime of the ISO7221AD at rated voltage?
The device has a typical lifetime of 28 years at rated voltage.
- What is the transient immunity of the ISO7221AD?
The device has a typical transient immunity of 50 kV/μs.
- What are the key applications of the ISO7221AD?
The device is used in factory automation, computer peripheral interfaces, servo control interfaces, and data acquisition.
- Is the ISO7221AD still in production?
No, the ISO7221AD is obsolete and no longer in production. New designs should consider an alternate product.
- What package types are available for the ISO7221AD?
The device is available in an 8-pin SOIC (D) package.
