MAX3043EWE+

Overview

The MAX3043EWE+ is a quad RS-422 transmitter designed for digital data transmission over twisted-pair balanced lines. It operates from a single +5V supply and supports data rates up to 250kbps. 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. The unit consumes 1mA of operating current and enters a low-power shutdown mode with 2nA consumption. It is housed in a 16-pin Wide SO package.

Feature Summary

• Hot-swap capability prevents erroneous data transfer during board insertion or power-up sequences.
• Robust electromagnetic compatibility with ±10kV HBM ESD protection and ±4kV IEC fast transient burst immunity.
• Slew-rate limiting minimizes electromagnetic interference and reduces signal reflections on improperly terminated cables.
• Low-power operation with 1mA active current and 2nA shutdown current.

Applications

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

Procurement Notes

Verify the specific suffix 'E' indicates an extended temperature range of -40°C to +85°C, while 'C' denotes commercial range. Confirm the 'WE' suffix corresponds to the 16-pin Wide SOIC package. Ensure the datasheet revision matches the design requirements for RS-422 compliance. Check for RoHS compliance status as indicated by the '+' suffix.

Selection Notes

Select this component when only RS-422 transmission is required, as it lacks integrated receivers. Compare against MAX3040/MAX3043 variants if lower data rates are sufficient. Consider MAX3041/MAX3044 for higher speeds up to 2.5Mbps. Verify pin compatibility with legacy SN75174 designs if upgrading existing hardware.

Part Context

This part belongs to the MAX3040–MAX3045 family of quad transmitters. It serves as a low-power, ESD-protected upgrade to industry-standard devices like the SN75174 and DS26LS31C. The family offers various speed grades and packaging options to suit different interface density and performance needs.

Replacement Considerations

Pin-compatible replacements include the MAX3040CWE+, MAX3041EWE+, and MAX3042BEWE+. Legacy equivalents such as the SN75174 and DS26LS31C can be replaced, though they lack the enhanced ESD and hot-swap features.

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 MAX3043 and MAX3044?

The MAX3043 is optimized for RS-422 standards with a 250kbps rate, while the MAX3044 supports RS-485/RS-422 at 2.5Mbps. They have different pinout configurations for their enable inputs.

What is the shutdown current consumption?

In shutdown mode, the MAX3043EWE+ consumes a maximum of 10µA, with a typical value of 2nA at +25°C.