ISL3172EIBZ

Overview

The ISL3172EIBZ is a 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 250 kbps. The device features ±15kV IEC61000 ESD protection on RS-485 I/O pins and >7kV HBM protection on other pins. It incorporates full fail-safe receivers that ensure a logic high output when inputs are floating, shorted, or undriven. Hot-plug circuitry maintains three-state outputs during power-up. The transceiver presents a true 1/8 unit load, allowing up to 256 devices on the bus. It includes current limiting and thermal shutdown for driver overload protection. Operating temperature ranges from -40°C to +85°C.

Feature Summary

• IEC61000 compliant ESD protection with ±15kV rating on differential I/O pins
• Full fail-safe receiver design ensuring defined logic state under open, short, or floating conditions
• Hot-plug capability maintaining high-impedance states during power stabilization
• True 1/8 unit load architecture enabling high node density without repeaters

Applications

• Remote utility meter reading systems requiring high node counts
• Industrial control networks utilizing RS-485 communication protocols
• Building automation systems with balanced communication requirements

Procurement Notes

Verify the specific suffix 'IBZ' corresponds to the SOIC-8 package variant when sourcing. Confirm RoHS compliance status through official manufacturer documentation. Ensure the selected component matches the required half-duplex configuration. Validate operating temperature range specifications against environmental constraints. Cross-reference datasheet revisions to confirm pinout and electrical parameter consistency.

Selection Notes

Select this component for applications requiring robust ESD protection and low power consumption in 3.3V systems. The true 1/8 unit load feature distinguishes it from standard 1/32 unit load devices, reducing the need for bus repeaters. Verify compatibility with slew rate limited drivers if EMI reduction is critical. Ensure the half-duplex topology aligns with system communication needs rather than full-duplex alternatives.

Part Context

The ISL3172EIBZ belongs to the ISL317xE family of transceivers designed for RS-485 and RS-422 standards. This series emphasizes low power operation and high reliability in industrial environments. The IBZ suffix specifically denotes the SOIC-8 surface mount package variant. The family shares common features such as fail-safe receivers and hot-plug functionality across different duplex configurations.

Replacement Considerations

Direct substitutes within the same family include variants with different package options or duplex configurations, such as ISL3172EIUZ for MSOP-8 packaging. Verify functional equivalence regarding data rate limits and ESD protection levels before substitution. Check for any changes in pinout or supply voltage requirements when considering cross-package replacements.