MAX3070EASD+T

Overview

The MAX3070EASD+T is a +3.3V, full-duplex RS-485 transceiver featuring one driver and one receiver in an 8-pin SO package. It operates within a supply voltage range of 3.0V to 3.6V and supports data rates up to 250kbps with reduced slew-rate drivers. The device provides ±15kV ESD protection on I/O pins and incorporates fail-safe circuitry that guarantees a logic-high receiver output when inputs are open or shorted. Hot-swap capability prevents false transitions during power-up or bus insertion. Operating temperatures range from -40°C to +125°C, with a typical supply current of 0.8mA.

Feature Summary

• Integrated hot-swap input structure on DE and RE pins eliminates false transitions during board insertion or power-up sequences.
• True fail-safe receiver design ensures a logic-high output state when receiver inputs are left open or shorted, maintaining EIA/TIA-485 compatibility.
• Reduced slew-rate driver technology minimizes electromagnetic interference (EMI) and signal reflections caused by improperly terminated cables.
• Robust protection includes ±15kV human body model ESD tolerance on all I/O pins and thermal shutdown for driver overcurrent protection.

Applications

• Industrial control systems requiring robust communication over twisted-pair lines
• Telecommunications equipment utilizing RS-485 networks
• Security systems with multiple sensor nodes
• Instrumentation devices operating in electrically noisy environments

Procurement Notes

Verify the specific suffix ASD indicates the 8-pin SOIC package and the E grade denotes the industrial temperature range (-40°C to +125°C). Confirm RoHS compliance status through official manufacturer documentation prior to integration. Ensure the ordering code matches the exact pinout and electrical specifications required for the target application design.

Selection Notes

Select this component for applications requiring full-duplex communication at speeds up to 250kbps with enhanced noise immunity. The reduced slew rate makes it suitable for long cable runs where signal integrity is critical. Verify that the system operates strictly at 3.3V, as this device does not support higher voltage rails like 5V. Consider the 8-pin SO package constraints for PCB layout and thermal dissipation requirements.

Part Context

This part belongs to the MAX3070E–MAX3079E family of +3.3V RS-485 transceivers manufactured by Analog Devices / Maxim Integrated. While other members of the series offer half-duplex operation or higher data rates up to 16Mbps, the MAX3070E specifically provides full-duplex functionality with fixed 250kbps slew-rate limiting. It shares common features like fail-safe and hot-swap capabilities with the broader family.

Replacement Considerations

Direct functional replacements within the same family include the MAX3071E and MAX3076E, though these differ in duplex mode or slew-rate characteristics. Cross-vendor alternatives must be evaluated for pin compatibility, voltage levels, and ESD ratings. Verify that any substitute maintains the specific 250kbps data rate limit and full-duplex architecture if those parameters are critical to the design.