MAX3040CSE+T

Overview

The MAX3040CSE+T is a quad RS-485/RS-422 transmitter manufactured by Analog Devices Inc./Maxim Integrated. It operates on a single +5V supply and supports data rates up to 250kbps with slew-rate limiting to minimize EMI. The device features ±10kV Human Body Model ESD protection and ±4kV Electrical Fast Transient immunity per IEC 1000-4-4. It includes hot-swap capability for safe insertion into live backplanes. The component is housed in a 16-pin Narrow SO package and functions within an operating temperature range of 0°C to +70°C.

Feature Summary

• Hot-swap capability prevents false transitions during power-up or board insertion
• Slew-rate limited outputs reduce reflections on improperly terminated cables
• Robust protection against electrostatic discharge and electrical fast transients
• Low-power shutdown mode minimizes energy consumption when disabled

Applications

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

Procurement Notes

Verify the specific ordering suffix CSE+T to confirm the narrow SOIC package, commercial temperature range, and lead-free status. Ensure compatibility with existing PCB footprints designed for 16-pin wide or narrow SO packages. Confirm that the 250kbps data rate meets system requirements compared to higher-speed variants like the MAX3041.

Selection Notes

Select this part for applications requiring robust ESD protection and hot-swap functionality on RS-485 or RS-422 networks. It serves as a pin-compatible upgrade to industry-standard drivers like the SN75174. Choose this model over faster variants if minimizing electromagnetic interference through slew-rate limiting is a priority for the specific bus topology.

Part Context

This component belongs to the MAX3040–MAX3045 family of 5V quad transmitters. While the MAX3040 offers 250kbps performance, other members of the family support speeds up to 20Mbps. The MAX3040CSE+T specifically denotes the commercial temperature grade and narrow SOIC packaging variant within this broader product line.

Replacement Considerations

The datasheet confirms pin compatibility with the 'SN75174, 'DS26LS31C, and LTC487. These components can be considered direct replacements for legacy designs requiring similar interface capabilities.