MAX3040CWE+

Overview

The MAX3040CWE+ is a quad RS-485/RS-422 transmitter manufactured by Analog Devices Inc./Maxim Integrated. It operates from a single +5V supply (4.75V to 5.25V) with a typical operating current of 1mA and a shutdown current of 2nA. The device supports data rates up to 250kbps, featuring slew-rate limiting to minimize EMI. It provides ±10kV Human Body Model ESD protection and ±4kV IEC 1000-4-4 Electrical Fast Transient immunity. Packaged in a 16-pin Wide SOIC, it operates within a temperature range of 0°C to +70°C.

Feature Summary

• Hot-swap capability prevents false transitions during power-up or insertion
• Slew-rate limited outputs reduce reflections on improperly terminated cables
• Low-power shutdown mode consumes only 2nA
• Robust protection against electrostatic discharge and electrical fast transients

Applications

• Telecommunications equipment
• Industrial motor control systems
• Transmitter for ESD-sensitive applications
• Hand-held equipment
• Industrial PLCs

Procurement Notes

Verify the specific suffix 'CWE+' corresponds to the commercial temperature range and wide SOIC package. Confirm RoHS compliance status through official manufacturer documentation. Check for obsolescence notices as some variants in this family have been discontinued. Ensure pin compatibility requirements match legacy SN75174 designs if applicable.

Selection Notes

Select the MAX3040CWE+ when a 250kbps data rate is sufficient and low EMI is required due to its slew-rate limiting feature. Choose this part over higher-speed variants like the MAX3041 if cost or power consumption at lower speeds is a priority. Verify that the 0°C to +70°C temperature range meets the environmental requirements of the target application.

Part Context

This component belongs to the MAX3040–MAX3045 family of 5V quad RS-485/RS-422 transmitters. These devices serve as low-power, ESD-protected upgrades to industry-standard parts like the SN75174 and DS26LS31C. The family offers various speed grades and packaging options to suit different interface needs.

Replacement Considerations

Pin-compatible replacements include the SN75174 and DS26LS31C, though these lack the enhanced ESD protection and hot-swap features. Other family members like the MAX3041 offer higher speeds but may not be suitable if slew-rate limiting is specifically required.