MAX241ECAI+

Overview

The MAX241ECAI+ is a single-supply RS-232 transceiver manufactured by Analog Devices Inc./Maxim Integrated. It operates from a +4.5V to +5.5V supply and features four drivers and five receivers for full-duplex communication. The device supports data rates up to 120kbps with typical propagation delays of 0.5µs for receivers and 2µs for transmitters. It includes integrated charge-pump circuitry requiring four external 1µF capacitors to generate ±10V internal rails. Key electrical characteristics include ±15kV ESD protection on I/O pins, a shutdown supply current of 1µA, and receiver input hysteresis of approximately 0.5V. The component is housed in a 28-pin SSOP package and functions within an operating temperature range of 0°C to +70°C.

Feature Summary

• Integrated high ±15kV HBM ESD protection on RS-232 inputs and outputs
• Single +5V supply operation enabled by internal charge-pump voltage converters
• Low-power shutdown mode reducing supply current to typically 1µA
• Receiver inputs feature approximately 0.5V hysteresis for noise immunity

Applications

• Battery-powered equipment
• Hand-held equipment
• Portable diagnostics equipment

Procurement Notes

Verify the specific ordering suffix against official documentation to confirm package type and temperature range. The 'CAI' designation indicates a 28-pin SSOP package with commercial temperature ratings. Confirm RoHS compliance status through manufacturer certificates. Ensure the required 1µF charge-pump capacitors are included in the bill of materials as they are not integrated internally for this variant.

Selection Notes

Select the MAX241ECAI+ when four transmit channels and five receive channels are required for RS-232 connectivity. This part is suitable for designs constrained to a single +5V power rail without access to bipolar supplies. Consider the 28-pin SSOP footprint for space-limited PCB layouts. Verify that the 120kbps maximum data rate meets system timing requirements before finalizing the component choice.

Part Context

This component belongs to the MAX202E–MAX213E and MAX232E/MAX241E family of RS-232 transceivers. These devices share common architecture including integrated charge pumps and ESD protection structures. The MAX241E variant specifically provides a higher channel count compared to standard two-driver parts like the MAX232E. The family is designed for cost-sensitive applications requiring rugged performance in harsh environments.

Replacement Considerations

The MAX241EEAI+ serves as a direct functional replacement offering extended industrial temperature range capabilities (-40°C to +85°C). Both parts utilize identical pinouts and require the same external capacitor values. Verify thermal constraints during substitution to ensure the alternative package can dissipate heat effectively within the new operating limits.