ADUM1255ASA+

Overview

The ADUM1255ASA+ is a digital isolator from Analog Devices featuring two channels in an 8-pin WSOIC package. It provides one unidirectional and one bidirectional channel with galvanic isolation rated at 848 Vrms. The device operates on a supply voltage range of 2.25 V to 5.5 V, drawing a typical operating current of 1 mA. Key electrical characteristics include a propagation delay of 128.4 ns, a maximum fall time of 64.7 ns, and a pulse width distortion of 94.2 ns. It supports a power dissipation of 471 mW and functions within a temperature range of -40°C to +85°C.

Feature Summary

• Combines one unidirectional and one bidirectional channel for flexible signal routing
• Provides galvanic isolation with a high insulation voltage rating
• Operates with low power consumption suitable for energy-efficient designs

Applications

• Industrial automation systems requiring isolated sensor interfaces
• Medical equipment needing reliable signal isolation
• Data acquisition systems with mixed signal domains

Procurement Notes

Verify the specific suffix 'ASA+' against the manufacturer's official datasheet to confirm pinout and electrical specifications match your design requirements. Check current availability status as supply constraints may affect lead times. Ensure compliance with RoHS directives and moisture sensitivity levels before integration into production assemblies.

Selection Notes

Select this component when a mixed channel configuration of unidirectional and bidirectional paths is required within a single package. Consider its 848 Vrms isolation rating for applications demanding moderate galvanic separation. Evaluate the 1 mA current consumption against system power budgets and verify that the 128.4 ns propagation delay meets the timing constraints of the target communication protocol.

Part Context

This part belongs to the ADUM125x series of iCoupler digital isolators from Analog Devices. These devices utilize magnetic coupling technology to provide isolation without the need for external components like transformers or optocouplers. The series offers various channel configurations and isolation ratings to suit different interface needs in industrial and commercial applications.

Replacement Considerations

Cross-reference with ADUM1250ARZ or ADUM1252ARZ if channel directionality or isolation voltage requirements differ. Verify package compatibility between WSOIC-8 and alternative SOIC-8 footprints during substitution planning.