ADM237LAR-REEL

Overview

The ADM237LAR-REEL is a CMOS RS-232 transceiver from Analog Devices, designed for single 5 V operation. It integrates five drivers and three receivers within a 24-pin SOIC package. The device supports data rates up to 120 kbps and operates with a supply voltage range of 4.75 V to 5.25 V. Internal charge pumps generate the required ±10 V levels using four external 1 µF capacitors. It features Schmitt trigger inputs with 0.65 V hysteresis and ±30 V receiver input protection. The component operates across an industrial temperature range of -40°C to +85°C and draws 13 mA during normal operation.

Feature Summary

• Integrates internal DC-to-DC converters to enable full RS-232 functionality from a single 5 V power supply without requiring external negative voltage sources.
• Provides high noise immunity through Schmitt trigger receiver inputs that feature built-in hysteresis to prevent false triggering on slow or noisy signal transitions.
• Includes robust input protection capable of withstanding ±30 V signals on receiver pins, ensuring reliability in electrically noisy industrial environments.

Applications

• Industrial computer serial communication interfaces
• Peripheral equipment connection via standard RS-232 ports
• Instrumentation systems requiring reliable serial data transfer

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to confirm the reel packaging configuration. Ensure the selected variant matches the required operating temperature range and pinout compatibility for your printed circuit board design before finalizing procurement.

Selection Notes

Select this component when a system requires multiple transmit channels alongside receive capabilities while maintaining a low-profile surface-mount footprint. It is suitable for designs constrained by space where integrating five drivers and three receivers into a single 24-pin package reduces overall board area compared to discrete solutions.

Part Context

This part belongs to the ADM2xxL family of enhanced CMOS RS-232 transceivers. It serves as an upgrade to earlier AD2xx series devices, offering improved power efficiency and faster slew rates. The L-series designation indicates optimized performance characteristics allowing the use of smaller external capacitors compared to previous generations.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided source material.