MAX3045BEUE+T

Overview

The MAX3045BEUE+T is a quad RS-485/RS-422 transmitter designed for digital data transmission over twisted-pair balanced lines. It operates from a single +5V power supply with a voltage range of 4.75V to 5.25V and supports data rates up to 20Mbps. The device features ±10kV ESD protection (Human Body Model) 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, consumes 1mA operating current, and enters a low-power shutdown mode drawing only 2nA. The component is housed in a 16-pin TSSOP package.

Feature Summary

• Integrated hot-swap inputs that maintain disabled states during power-up to eliminate erroneous data transfer on the bus.
• Robust output protection rated for ±10kV electrostatic discharge and ±4kV electrical fast transient burst stress.
• Low-power architecture providing 1mA active supply current and 2nA consumption in shutdown mode.
• Pin-compatible design serving as an upgrade to industry-standard 'SN75174 and 'DS26LS31C devices.

Applications

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

Procurement Notes

Verify the specific suffix BEUE+T against the official Analog Devices datasheet to confirm the -40°C to +85°C temperature range and TSSOP-16 packaging. Ensure compatibility with existing board layouts by checking pin assignments against legacy SN75174 standards. Confirm RoHS compliance status through manufacturer documentation prior to final procurement decisions.

Selection Notes

Select this component when high-speed data rates up to 20Mbps are required alongside robust environmental protection. It is suitable for designs needing hot-swap functionality without external logic. Verify that the system operates within the specified +5V supply constraints and requires four independent differential drivers rather than transceivers.

Part Context

This part belongs to the MAX3040–MAX3045 family of 5V quad RS-485/RS-422 transmitters. While other variants like the MAX3040 offer lower speeds for EMI reduction, the MAX3045B variant is specifically optimized for maximum throughput. It serves as a direct functional replacement for older discrete driver solutions in multi-drop communication networks.

Replacement Considerations

Publicly confirmed pin-compatible substitutes include the 'SN75174 and 'DS26LS31C. Designers should verify that these legacy replacements lack the integrated hot-swap circuitry and superior ESD ratings found in the MAX3045BEUE+T.

FAQ

How does the hot-swap feature function during power-up?

Internal circuitry holds the enable inputs low for approximately 10µs after VCC ramps up, preventing the outputs from driving the bus while the processor initializes.

What is the difference between the MAX3045B and MAX3045E variants?

The 'B' suffix indicates a commercial temperature range (0°C to +70°C), while the 'E' suffix denotes an extended industrial temperature range (-40°C to +85°C).

Does the MAX3045BEUE+T include receivers?

No, it is a transmitter-only device. It must be paired with compatible receivers such as the MAX3093E or MAX3095 for full duplex communication.