Digital converter ISO7741

communicationssignalvoltage/current

Product overview
The ISO7741 is a quad-channel digital isolator providing galvanic isolation between CMOS/LVCMOS I/Os. Channels use input and output buffers separated by a dual capacitive SiO2 insulation barrier. The family includes versions with basic and reinforced insulation ratings (EN/UL standards) and options for default output state (default high or suffix F = default low). Enable pins allow each output to be placed in high impedance for multi-controller designs and reduced power consumption.

Key features (summary)

• 100 Mbps maximum data rate
• Isolation barrier with >30‑year projected lifetime at 1500 VRMS working voltage
• Isolation ratings up to 5000 VRMS (DW) and 3000 VRMS (DBQ), depending on package/variant
• Surge isolation capability up to 12.8 kV (VIOSM) on selected variants
• Typical CMTI ~±100 kV/µs; minimum CMTI values specified per device
• Supply and level-translation range: 2.25 V to 5.5 V
• Default output options: high (ISO774x) or low (ISO774xF)
• Operating temperature range: −55 °C to 125 °C
• Low current consumption: typically ~0.88 mA (DC) and ~1.5 mA per channel at 1 Mbps
• Typical propagation delay: ~10.7 ns (5 V supplies)
• System-level EMC features: ESD, EFT and surge immunity; ±8 kV IEC 61000-4-2 contact discharge across barrier; low emissions
• Package options: Wide-SOIC (DW-16) and QSOP/SSOP (DBQ-16)
• Automotive variants available (ISO774x-Q1)
• Safety certifications: VDE/EN IEC 60747-17, UL 1577, IEC 61010-1, IEC 62368-1, IEC 60601-1, GB 4943.1 (per variant)

Packages, images and media available on product page
Available package options include 16-pin Wide-SOIC (DW) and 16-pin SSOP/QSOP (DBQ). The product page provides package drawings, simplified schematics, block diagrams and images to illustrate device connections and footprint outlines.

Applications and usage notes
Use ISO7741 to isolate digital interfaces and prevent noise or transient currents on data buses (RS-485, RS-232, CAN) from entering local ground. Typical applications: industrial communication interfaces, isolated data acquisition, motor drives, and systems requiring basic or reinforced isolation. For optimal performance, pair with an isolated power supply and follow layout recommendations in the datasheet to meet system EMC and safety requirements.

Datasheet and technical documents
Datasheet, application notes, certification documents, evaluation board guides and simulation models are available on the product page to support design, testing and certification efforts.

Technical specifications

• Number of channels: 4
• Forward/reverse channels: 3 forward / 1 reverse
• Integrated isolated power: No
• Isolation rating: Basic, Reinforced (package-dependent)
• Default output: High or Low (suffix F = default low)
• Data rate (max): 100 Mbps
• Supported protocols: GPIO, PWM, SPI, UART
• Surge isolation voltage (VIOSM): 7,800; 10,000; 12,800 VPK (variant dependent)
• Transient isolation voltage (VIOTM): e.g., 4,242; 8,000 VPK
• Withstand isolation voltage (VISO): 3000 Vrms (DBQ), 5000 Vrms (DW)
• CMTI (min): 85,000 V/µs (typical family values higher)
• Operating temperature: −55 °C to 125 °C
• Supply voltage: 2.25 V to 5.5 V
• Propagation delay (typ): 0.0107 µs (10.7 ns)
• Current consumption per channel (typ): 0.88 mA (DC); ~1.48–1.5 mA at 1 Mbps
• Creepage / clearance (min): 3.7 mm or 8 mm (variant dependent)