OptoCoupler Buffer-OUT 2-CH 8-Pin SOIC T/R

The ISO7420, ISO7420M and ISO7421 provide galvanic isolation up to 2.5 kVrms for 1 minute per UL. These digital isolators have two isolated channels. Each isolation channel has a logic input and output buffer separated by a silicon dioxide (SiO2) insulation barrier. Used in conjunction with isolated power supplies, these devices prevent noise currents on a data bus or other circuit from entering the local ground and interfering with or damaging sensitive circuitry. The suffix M indicates wide temperature range (–40°C to 125°C). The devices have TTL input thresholds and require two supply voltages, 3.3V or 5V, or any combination. All inputs are 5-V tolerant when supplied from a 3.3V supply. Note: The ISO7420 and ISO7421 are specified for signaling rates up to 1 Mbps. Due to their fast response time, under most cases, these devices will also transmit data with much shorter pulse widths. Designers should add external filtering to remove spurious signals with input pulse duration < 20ns if desired. 

Highest Signaling Rate: 1 Mbps

Low Power Consumption, Typical I_CC per
Channel (3.3V operation):

• ISO7420: 1.1 mA, ISO7421: 1.5 mA

Low Propagation Delay – 9 ns Typ. and
Low Skew – 300 ps Typ.

Wide T_A Range Specified: –40°C to 125°C

UL 1577 Approved with 2.5 kVrms Rating

4242 Vpeak Isolation

CSA, IEC 60950-1 and IEC 61010-1 Approved

50 kV/µs Transient Immunity, Typical

Over 25-Year Isolation Integrity at Rated Voltage

Operates From 3.3V and 5V Supply and Logic Levels

APPLICATIONS

• Optocoupler Replacement in:
  • Industrial Fieldbus
    • Profibus
    • Modbus
    • DeviceNet™ Data Buses
  • Servo Control Interface
  • Motor Control
  • Power Supplies
  • Battery Packs