MAX3442EAPA+

Overview

The MAX3442EAPA+ is a half-duplex RS-485 transceiver manufactured by Analog Devices Inc./Maxim Integrated. It operates from a single +4.75V to +5.25V supply and supports data rates up to 250kbps. The device features ±60V fault protection on the A and B bus lines, ±15kV ESD protection, and true fail-safe receiver inputs that guarantee a logic-high output when inputs are open or shorted. It includes hot-swap circuitry for telecom applications and enhanced slew-rate limiting to minimize EMI. The component is housed in an 8-pin PDIP package and is specified over an automotive temperature range of -40°C to +125°C.

Feature Summary

• ±60V fault protection on communication bus lines
• True fail-safe receiver inputs for open or shorted line conditions
• Hot-swap capability prevents false transitions during backplane insertion
• Enhanced slew-rate limiting reduces EMI and reflections

Applications

• RS-422/RS-485 communications
• Industrial networks
• Telecommunications systems
• HVAC controls

Procurement Notes

Verify the specific ordering suffix against official manufacturer documentation to confirm package type and temperature rating. Ensure compatibility with system voltage requirements and interface standards before integration. Cross-reference part numbers with authorized distributors to confirm current availability status.

Selection Notes

Select this component for designs requiring robust fault protection and low electromagnetic interference. The reduced slew rate makes it suitable for longer cable runs where signal integrity is critical. Verify that the 250kbps maximum data rate meets application timing requirements compared to higher-speed variants in the family.

Part Context

This device belongs to the MAX3440E–MAX3444E series of fault-protected RS-485 and J1708 transceivers. It shares the same functional block diagram and pinout as other members of the family, differing primarily in data rate capabilities and control pin configurations. The 'PA' suffix indicates an 8-pin PDIP package variant.

Replacement Considerations

Direct substitutes within the same family include MAX3440EAPA+ and MAX3444EAPA+. These parts share identical pinouts and fault protection features but may differ in data rate specifications or control logic. Verify electrical characteristics match the original design constraints.

FAQ

What is the maximum data rate for the MAX3442EAPA+?

The maximum data rate is 250kbps due to its enhanced slew-rate limiting feature.

How does the device handle open or shorted receiver inputs?

It employs true fail-safe inputs that guarantee a logic-high receiver output when the A and B lines are open, shorted, or connected to an idle data line.

What is the purpose of the hot-swap circuitry?

The hot-swap circuitry eliminates false transitions on the data bus during circuit initialization or connection to a live backplane by holding enable pins in a defined state until power stabilizes.