MAX3440EEPA+

Overview

The MAX3440EEPA+ is a fault-protected RS-485 transceiver manufactured by Analog Devices/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 for operation over the industrial temperature range of -40°C to +85°C.

Feature Summary

• ±60V Fault Protection
• True Fail-Safe Receiver Inputs
• Hot-Swap Capability
• Enhanced Slew-Rate Limiting

Applications

• RS-422/RS-485 Communications
• Industrial Networks
• Telecommunications Systems
• HVAC Controls

Procurement Notes

Verify the specific ordering suffix EEPA+ corresponds to the 8-pin PDIP package and the -40°C to +85°C industrial temperature range. Confirm RoHS compliance status as indicated by the plus sign in the part number. Ensure the source documentation explicitly lists this exact part number variant before finalizing procurement specifications.

Selection Notes

Select the MAX3440EEPA+ when reduced electromagnetic interference (EMI) and minimized signal reflections are required for error-free transmission at lower speeds. This model is specifically designed with slew-rate limiting, distinguishing it from the non-limited MAX3441E/MAX3443E variants which support higher data rates. Verify that the 8-pin PDIP package format meets the board layout requirements.

Part Context

This component belongs to the MAX3440E–MAX3444E family of fault-protected RS-485 and J1708 transceivers. The family shares common electrical characteristics such as ±60V fault protection and 1/4-unit-load input impedance, allowing up to 128 devices on a single bus. Variations within the family primarily differ in data rate capabilities and control pin configurations.

Replacement Considerations

The MAX3440EESA+ serves as a direct functional replacement utilizing an SOIC package instead of PDIP. For higher speed requirements, the MAX3441E series offers up to 10Mbps but lacks slew-rate limiting. Cross-referencing pinouts and thermal dissipation limits is necessary when changing package types.