MAX3443EAPA+

Overview

The MAX3443EAPA+ is a half-duplex RS-485 transceiver in an 8-pin PDIP package. It operates from a 5V supply (4.75V to 5.25V) at data rates up to 10Mbps. The device features ±60V fault protection on the A and B pins, ±15kV ESD protection, and true fail-safe receiver inputs that guarantee a logic-high output when inputs are open or shorted. It includes low-power shutdown mode with a maximum current of 20µA and hot-swap capability for telecom applications.

Feature Summary

• ±60V Fault Protection
• True Fail-Safe Receiver Inputs
• Hot-Swap Capability

Applications

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

Procurement Notes

Verify the component against official Analog Devices documentation to confirm the specific ordering suffix matches the required package type and temperature range. Ensure compatibility with system voltage levels and interface requirements before integration.

Selection Notes

Select this model for applications requiring high-speed data transmission up to 10Mbps alongside robust fault protection. The automotive temperature range (-40°C to +125°C) makes it suitable for harsh environments where bus line faults are likely.

Part Context

This part belongs to the MAX3440E–MAX3444E family of fault-protected RS-485 and J1708 transceivers. The 'PA' suffix indicates an 8-pin PDIP package, while the 'E' suffix specifies the extended automotive temperature range. The '+' denotes lead-free and RoHS compliance.

Replacement Considerations

Direct substitutes within the same family include MAX3443EESA+ (SOIC package). Other variants like MAX3440E or MAX3442E offer different slew-rate characteristics but share similar pinouts and protection features.

FAQ

What is the purpose of the FAULT pin?

The FAULT pin outputs a logic-high signal when a fault condition is detected on the A or B lines, such as a short circuit or voltage outside the common-mode range.

How does the device handle hot-swap situations?

Internal circuitry holds the driver enable input low during power-up to prevent false transitions on the data bus when connecting to a live backplane.

What ensures fail-safe operation?

The receiver uses a differential input threshold of -50mV to -200mV, guaranteeing a logic-high output if the inputs are open, shorted, or connected to an idle line.