MAX3045BCSE+

Overview

The MAX3045BCSE+ 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) and supports data rates up to 20Mbps. 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 to prevent false transitions during power-up or insertion. Operating current is 1mA, with a shutdown mode consuming 2nA. It is housed in a 16-pin Narrow SO package and functions within an industrial temperature range of 0°C to +70°C.

Feature Summary

• Hot-swap capability prevents erroneous data transfer during board insertion or power-up sequences.
• Robust input/output protection against electrostatic discharge and electrical fast transients.
• Low-power operation with minimal supply current consumption in active and shutdown states.
• Pin-compatible replacement for industry-standard SN75174 and DS26LS31C devices.

Applications

• Telecommunications equipment
• Industrial motor control systems
• Transmitter applications requiring ESD sensitivity
• Hand-held equipment interfaces
• Industrial PLCs and networking

Procurement Notes

Verify the specific suffix 'BCSE+' corresponds to the required commercial temperature range and narrow SOIC package configuration. Confirm RoHS compliance status as indicated by the '+' designation. Ensure the ordering information matches the exact manufacturer part number to avoid pinout mismatches with legacy components.

Selection Notes

Select this component when high-speed data transmission up to 20Mbps is required on RS-485 or RS-422 buses. It is suitable for environments demanding significant ESD and transient immunity without external protection circuits. Consider the narrow SO package constraints for PCB layout if space is limited compared to wide SO or TSSOP options.

Part Context

This device belongs to the MAX3040–MAX3045 family of quad 5V transmitters designed for twisted-pair balanced lines. The MAX3045B variant specifically targets higher data rates compared to the slew-rate limited MAX3040/MAX3041/MAX3043/MAX3044 models. It serves as a low-power upgrade to legacy interface standards.

Replacement Considerations

Public confirmed substitutes include MAX3045BEUE+, MAX3045BEWE+, and MAX3045BCUE+. These variants share identical functionality but differ in operating temperature ranges or physical package types such as TSSOP or Wide SO.

FAQ

How does the hot-swap feature function?

The hot-swap inputs hold the enable pins in a disabled state during power-up or board insertion, preventing false transitions on the data cable caused by leakage currents or parasitic capacitance.

What is the difference between MAX3045B and other family members?

The MAX3045B is optimized for data transfer rates up to 20Mbps, whereas models like MAX3040/MAX3043 are limited to 250kbps and MAX3041/MAX3044 to 2.5Mbps due to slew-rate limiting.

Is the MAX3045BCSE+ compatible with SN75174?

Yes, the MAX3040–MAX3045 family offers pin-compatible, low-power upgrades to the industry-standard SN75174 and DS26LS31C devices.