MAX3430EPA+

Overview

The MAX3430EPA+ is a +3.3V, half-duplex RS-485 transceiver in an 8-pin PDIP package. It features ±80V fault protection on driver outputs and receiver inputs against ground faults. The device supports data rates up to 250kbps with internal slew-rate limiting. It incorporates true fail-safe circuitry guaranteeing a logic-high output when inputs are open. The receiver input impedance is 1/4-unit load (48kΩ), allowing up to 128 transceivers on the bus. Supply current is typically 3.5mA, reducing to 200µA in shutdown mode.

Feature Summary

• ±80V Fault Protection
• True Fail-Safe Inputs
• Hot-Swap Input Structure

Applications

• RS-422/RS-485 Communications
• Industrial-Control Local Area Networks
• Profibus Applications

Procurement Notes

Verify the component designation matches the specific industrial temperature range (-40°C to +85°C) required for the application environment. Confirm that the 8-pin PDIP through-hole package aligns with the target PCB layout constraints. Ensure compatibility with the intended +3.3V power supply voltage before finalizing procurement specifications.

Selection Notes

Select this component when high-voltage fault tolerance is critical for protecting downstream electronics from bus line surges. The 1/4-unit-load receiver specification makes it suitable for networks requiring a high node count exceeding standard RS-485 limits. Verify that the 250kbps maximum data rate meets the system's communication speed requirements.

Part Context

This part belongs to the MAX3430 series of fault-protected RS-485 transceivers manufactured by Analog Devices / Maxim Integrated. The 'E' suffix indicates the extended industrial temperature range, while 'PA+' denotes the plastic DIP package with lead-free compliance. It serves as a robust interface solution for harsh industrial environments where signal integrity and hardware protection are paramount.

Replacement Considerations

MAX3430CPA+

FAQ

How does the MAX3430 handle hot-swap conditions?

It includes a hot-swap input structure on the DE pin that holds the driver disabled during power-up to prevent false transitions.

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

The 1/4-unit-load receiver input impedance allows up to 128 transceivers to be connected on a single communication line.