ISL3179EIUZ-T7A

Overview

The ISL3179EIUZ-T7A is a single half-duplex RS-485/RS-422 transceiver manufactured by Renesas Electronics. It operates on a single 3.3V supply and supports data rates up to 40 Mbps. The device features high ESD protection, meeting IEC 61000 standards, and includes full fail-safe receiver inputs that ensure a logic high output when inputs are floating or shorted. It presents a 1/5 unit load to the bus, allowing up to 160 transceivers on a network without repeaters. The component is housed in an SOIC-Narrow-8 package and operates within a temperature range of -40°C to +85°C.

Feature Summary

• High electrostatic discharge (ESD) protection compliant with IEC 61000 standards for robust communication environments.
• Full fail-safe receiver design guarantees a defined logic high state during input faults such as open circuits or shorts.
• Low bus current consumption enables connection of up to 160 nodes on a single RS-485 network without requiring repeaters.

Applications

• Balanced communication networks adhering to RS-485 and RS-422 standards
• Industrial automation systems requiring high noise immunity
• Metering applications supporting multiple node connections

Procurement Notes

Verify the specific suffix T7A corresponds to the tape and reel packaging configuration required for automated assembly processes. Confirm the RoHS compliance status through official manufacturer documentation prior to integration. Ensure the SOIC-Narrow-8 footprint matches the target PCB layout specifications exactly to prevent mounting issues.

Selection Notes

Select this component for applications requiring 3.3V operation with high-speed data transmission up to 40 Mbps. It is suitable for designs needing extensive bus loading capabilities due to its 1/5 unit load characteristic. Consider the half-duplex architecture if bidirectional communication on a single pair is sufficient for the system requirements.

Part Context

This part belongs to the ISL3179E series of high ESD protected transceivers from Renesas. It shares functional similarities with the ISL3180E but differs in duplex configuration, offering half-duplex operation compared to the full-duplex variant. Both devices share the same core electrical characteristics and package options.

Replacement Considerations

The ISL3179EIBZ-T7A serves as a verified alternative within the same product family, differing primarily in the SOIC-8 package variant while maintaining identical electrical performance and functionality.

FAQ

What is the maximum number of transceivers supported on a single RS-485 bus?

The ISL3179EIUZ-T7A presents a 1/5 unit load to the bus, allowing up to 160 transceivers to be connected without violating the RS-485 specification's 32 unit load maximum.

How does the device handle floating receiver inputs?

The receiver inputs feature a full fail-safe design that ensures a logic high Rx output if the Rx inputs are floating, shorted, or terminated but undriven.

Is the ISL3179EIUZ-T7A compatible with hot-plugging?

Yes, the device includes hot plug circuitry that ensures the Tx and Rx outputs remain in a high impedance state while the power supply stabilizes.