MAX3075EAPA+

Overview

The MAX3075EAPA+ is a +3.3V, half-duplex RS-485 transceiver in an 8-pin PDIP package. It features one driver and one receiver with fail-safe circuitry guaranteeing a logic-high output when inputs are open or shorted. The device supports data rates up to 500kbps with slew-rate-limited drivers to minimize EMI. It includes hot-swap capability on DE and RE pins to prevent false transitions during power-up. Supply current is typically 1.5mA, with shutdown current at 10µA. ESD protection is ±15kV (Human Body Model). Operating temperature range is -40°C to +125°C.

Feature Summary

• Slew-rate-limited drivers allow error-free transmission up to 500kbps while minimizing electromagnetic interference.
• Hot-swap input structures on DE and RE pins eliminate false bus transitions during board insertion or power-up sequences.
• True fail-safe receiver guarantees a logic-high output state when differential inputs are open, shorted, or disconnected.

Applications

• Industrial control systems
• Telecommunications equipment
• Security systems
• Lighting systems

Procurement Notes

Verify the specific suffix 'PA+' indicates the plastic DIP-8 package and lead-free compliance. Confirm the 'E' designation matches the extended industrial temperature range of -40°C to +125°C. Ensure the component source provides valid traceability documentation for Analog Devices/Maxim Integrated manufacturing standards.

Selection Notes

Select this model for half-duplex RS-485 networks requiring 500kbps speeds with reduced EMI. It is suitable for environments where hot-plugging occurs, as it prevents bus contention during power cycles. Verify that the system operates strictly at 3.3V, as this device does not support 5V logic levels.

Part Context

This component belongs to the MAX3070E–MAX3079E family of +3.3V RS-485 transceivers manufactured by Analog Devices/Maxim Integrated. The MAX3075 variant specifically combines half-duplex operation with a 500kbps maximum data rate and integrated thermal shutdown protection.

Replacement Considerations

The MAX3072EAPA+ offers identical electrical characteristics but lacks the 500kbps slew-rate limiting, operating at 250kbps. The MAX3078EAPA+ provides 16Mbps speed without slew-rate limiting. Cross-referencing pin compatibility and duplex mode requirements is essential before substitution.

FAQ

How does the MAX3075EAPA+ handle bus contention during hot insertion?

It utilizes hot-swap input structures on the DE and RE pins. Internal circuitry holds the driver disabled and receiver enabled until VCC stabilizes, preventing erroneous data transmission upon initial board insertion.

What is the fail-safe threshold voltage for the receiver?

The receiver outputs a logic-high if the differential input voltage (A-B) is greater than or equal to -50mV, and a logic-low if it is less than or equal to -200mV, ensuring a defined state when inputs are open or shorted.

Can the data rate be adjusted dynamically on the MAX3075EAPA+?

No, the MAX3075EAPA+ has fixed internal slew-rate limiting configured for a maximum of 500kbps. Dynamic adjustment is only available on the MAX3079E via the SRL pin.