MAX251EPD+

Overview

The MAX251EPD+ is a dual RS-232 transceiver manufactured by Analog Devices Inc. under the Maxim Integrated brand, housed in a 14-pin PDIP package. It operates on a single +5V supply and provides two drivers and two receivers for full-duplex communication at data rates up to 120kb/s. The device incorporates internal charge pumps to generate the necessary positive and negative voltages from the single supply, eliminating the need for external components. It functions within an industrial temperature range of -40°C to +85°C.

Feature Summary

• Integrated charge pump circuitry generates required voltage levels internally
• Supports full-duplex data transmission with two independent channels
• Designed for direct connection to standard D-sub connectors

Applications

• Industrial control systems requiring serial communication
• Point-of-sale terminals and barcode scanners
• Modem interfaces and portable instrumentation

Procurement Notes

Verify component authenticity through authorized distributors or official manufacturer channels. Confirm that the part number suffix matches the specific package type and temperature rating requirements for your design. Ensure compliance with relevant regional regulatory standards before integration into final products.

Selection Notes

Select this component when a robust, low-cost solution for short-distance serial communication is needed. It is suitable for applications where power consumption is not the primary constraint but simplicity of implementation is valued over higher speed capabilities found in newer interface families.

Part Context

This component belongs to the MAX250/MAX251 family of RS-232 transceivers. The MAX251 variant specifically offers two driver and receiver pairs, distinguishing it from single-channel alternatives. It represents a legacy interface solution widely used in established industrial and commercial equipment designs.

Replacement Considerations

Consider the MAX232EPE as a pin-compatible alternative offering similar functionality. Verify electrical specifications and package dimensions match existing board layouts before substitution.