MAX481ESA

Overview

The MAX481E is a low-power RS-485/RS-422 transceiver designed for harsh environments. It operates from a single +5V supply (4.75V to 5.25V) and supports data rates up to 2.5Mbps. The device features ±15kV ESD protection on all pins without latchup. It includes one driver and one receiver with independent enable controls, allowing operation in half-duplex mode. A low-current shutdown mode reduces supply current to 0.5µA when both RE is high and DE is low. The receiver input provides fail-safe logic-high output if the input is open circuit.

Feature Summary

• Provides ±15kV electrostatic discharge protection on driver outputs and receiver inputs without latchup.
• Features a low-power shutdown mode that significantly reduces supply current consumption.
• Includes thermal shutdown and short-circuit current limiting to protect against excessive power dissipation.
• Receiver input incorporates a fail-safe feature that guarantees a logic-high output during open-circuit conditions.

Applications

• Low-Power RS-485 Transceivers
• Low-Power RS-422 Transceivers
• Level Translators
• Transceivers for EMI-Sensitive Applications
• Industrial-Control Local Area Networks

Procurement Notes

Verify the specific ordering suffix to confirm the package type and temperature range. The 'ESA' designation indicates an SOIC-8 surface-mount package rated for -40°C to +85°C operation. Confirm RoHS compliance status and check for lead-free availability through official manufacturer channels or authorized distributors before procurement.

Selection Notes

Select the MAX481E for applications requiring high-speed data transmission up to 2.5Mbps. Unlike slew-rate-limited variants, this model allows faster signal transitions suitable for longer cable runs at higher baud rates. Ensure the design accommodates the standard 12kΩ receiver input impedance, which limits bus capacity to 32 unit loads compared to quarter-unit-load alternatives.

Part Context

The MAX481E belongs to the MAX48x family of low-power RS-485/RS-422 transceivers manufactured by Analog Devices / Maxim Integrated. This family shares common pinouts and basic functionality but varies in data rate capabilities and ESD protection levels. The MAX481E specifically offers unrestricted slew rates for higher speed communication compared to the 250kbps limited versions like the MAX483E.

Replacement Considerations

The non-E version MAX481 is functionally compatible but lacks the enhanced ±15kV ESD protection. For direct replacement within the same series, verify that the substitute part maintains the 2.5Mbps data rate and half-duplex configuration requirements of the original design.