Chipanalog Digital Isolators

Key specifications include: Isolation voltage (2.5kVrms or 5kVrms) based on safety requirements

Data rate (DC to 150Mbps) based on signal speed

Number of channels (1-8) based on interface requirements

CMTI (>100kV/μs) for noise immunity in switching applications

Propagation delay (10-20ns) for timing-critical applications

Operating temperature range (-40°C to +85°C or +125°C)

and Package type (SOIC-8 to SOIC-16, QFN). Chipanalog's selection guide helps match these specifications to your application needs.

Use our selection guide or contact our FAE team to match specifications to your application requirements.

Yes, Chipanalog digital isolators are pin-compatible and functionally equivalent to TI ISO series products. For example: CA-IS3740 replaces ISO7740 (quad channel)

CA-IS3741 replaces ISO7741 (quad with different channel directions)

CA-IS3720 replaces ISO7720 (dual channel). Chipanalog products offer the same or better performance in terms of isolation voltage, data rate, and CMTI, at significantly lower cost (typically 30-50% savings). Many customers have successfully replaced TI ISO series with Chipanalog in production without any design changes.

Contact our FAE team for cross-reference information and replacement recommendations for specific TI part numbers.

Chipanalog digital isolators feature typical propagation delays of 10-15ns, with maximum delays of 20-25ns depending on the specific product. This is comparable to or better than industry-standard products. The propagation delay is consistent across temperature and supply voltage variations, ensuring reliable timing in synchronous communication interfaces. For high-speed SPI interfaces running at 50MHz or higher, this low propagation delay ensures proper timing margins. Chipanalog also offers products with matched channel-to-channel propagation delay skew (<2ns) for parallel data buses.

For timing-critical applications, verify propagation delay specifications. Contact our FAE team for high-speed interface design guidance.

The isolated side requires a separate isolated power supply. Options include: Using the CA-IS37xx series with integrated isolated DC-DC converter (single-chip solution)

Adding an external isolated DC-DC converter module

Using a transformer-coupled isolated power supply

or Using capacitive isolated power solutions. For CA-IS3xxx series without integrated power, the VCC1 (input side) and VCC2 (output side) must be powered from separate isolated supplies. The isolated supply voltage should match the logic levels on that side (3.3V or 5V).

For simple designs, use CA-IS37xx with integrated power. For complex systems, use external isolated supplies. Contact our FAE team for power supply recommendations.

Important PCB layout considerations include: Keep high-speed traces short and matched for impedance

Place decoupling capacitors (0.1μF) close to VCC pins on both sides

Maintain clearance and creepage distances per isolation rating

Avoid placing high-speed signals directly under the isolator

Use ground planes for return current paths

Keep the isolation barrier area free of copper and components

and Follow the recommended pad layout in the datasheet. Proper layout ensures optimal performance and maintains isolation integrity.

Follow the PCB layout guidelines in the datasheet. Contact our FAE team for layout review services.