ICL3237ECA

Overview

The ICL3237ECA is a low-power RS-232 transceiver manufactured by Renesas Electronics Corporation, formerly Intersil. It operates from a single +3V to +5.5V supply and integrates five drivers and three receivers compliant with EIA/TIA-232 and V.28/V.24 standards. The device features an automatic powerdown function that reduces standby current to approximately 1µA when no valid RS-232 signal is detected. It includes on-chip charge pumps requiring only four small external capacitors. The component provides ±15kV ESD protection on RS-232 I/O pins and is housed in a 28-pin TSSOP package.

Feature Summary

• Automatic powerdown circuitry for ultra-low standby current consumption
• Integrated charge pumps eliminating the need for external inductors
• Robust ±15kV ESD protection on all RS-232 input and output pins
• Latch-up free design ensuring reliable operation across voltage transitions

Applications

• ISDN Terminal Adaptors
• Personal Digital Assistants (PDAs) and Palmtops
• Notebook and laptop computers
• Portable peripherals requiring low power consumption

Procurement Notes

Verify the manufacturer designation as Renesas Electronics Corporation or Intersil depending on the production era. Confirm the suffix 'E' indicates lead-free and RoHS compliance. Ensure the package type matches the required 28-TSSOP footprint. Check for specific ordering information regarding Pb-free availability options provided in official datasheets.

Selection Notes

Select this component for applications requiring strict power management in portable devices. The automatic powerdown feature is critical for extending battery life in idle states. Verify that the system operates within the +3V to +5.5V range. Ensure compatibility with existing EIA/TIA-232 signaling requirements without additional level shifting components.

Part Context

This device belongs to the ICL32X7E family of low-power RS-232 transceivers. It serves as a lower power replacement for older generations such as the MAX207E, HIN207E, and HIN237E. The family shares common architectural features including integrated charge pumps and automatic powerdown capabilities designed for mobile computing environments.

Replacement Considerations

Publicly confirmed direct substitutes include the MAX207E, HIN207E, and HIN237E. These components offer similar functionality but may differ in power consumption profiles. Verify pinout compatibility and electrical specifications before implementing any cross-brand substitution.