ISL3158AEMBZ

Overview

The ISL3158AEMBZ is a BiCMOS, half-duplex RS-485/RS-422 transceiver in an 8-lead SOIC package. It operates from a single 5V supply (4.5V to 5.5V) with a quiescent current of 600µA and shutdown current of 70nA. The device supports data rates up to 10Mbps and features ±16.5kV IEC61000 ESD protection on bus pins. It delivers a minimum differential output voltage of 2.4V into a 54Ω load and presents a true 1/8 unit load, allowing up to 256 devices on the network. Operating temperature range is -55°C to +125°C.

Feature Summary

• High driver output voltage improves noise immunity and allows driving multiple terminations in non-standard topologies.
• Robust ESD protection on RS-485 pins withstands ±16.5kV IEC61000-4-2 discharges without latch-up.
• Full fail-safe receiver design ensures logic high output when inputs are floating, shorted, or undriven.
• Hot plug circuitry maintains high-impedance state during power-up and power-down to prevent bus crashes.

Applications

• Utility meters and automated meter reading systems
• High node count fieldbus networks such as PROFIBUS
• Security camera networks
• Building lighting and environmental control systems

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm package type and tape/reel specifications. Confirm that the component meets RoHS compliance requirements for your assembly process. Check for any recent product change notices regarding pinout or electrical characteristics before finalizing procurement.

Selection Notes

Select this component for applications requiring extended industrial temperature ranges down to -55°C. Ensure the system design accommodates the half-duplex pinout configuration where receiver and driver outputs share pins. Verify that the 1/8 unit load characteristic aligns with the total device count required for the specific bus topology.

Part Context

This part belongs to the ISL3158AE family of 5V powered differential transceivers designed for balanced communication standards. It is manufactured by Renesas Electronics Corporation, formerly Intersil. The device is optimized for noisy environments and long-distance transmission using twisted pair cabling.

Replacement Considerations

Public datasheets identify the ISL3158E as a possible substitute product. Verify compatibility regarding package dimensions, pinout assignments, and electrical specifications before implementation.

FAQ

What is the maximum number of devices supported on the bus?

Due to its true 1/8 unit load characteristic, the ISL3158AEMBZ allows up to 256 devices on the network without violating RS-485 specifications.

How does the device handle hot plugging?

The ISL3158AEMBZ incorporates hot plug circuitry that keeps Tx and Rx outputs in a high-impedance state until the power supply stabilizes, preventing premature activation during power-up.

What is the common mode input voltage range?

The receiver inputs function with common mode voltages ranging from -7V to +12V, accommodating ground potential differences and induced voltages.