ICL7137CPL-3

ADCs/DACs - Special Purpose Overview

The ICL7137CPL-3 is a low-power, 3½-digit analog-to-digital converter (ADC) and display driver manufactured by Analog Devices Inc./Maxim Integrated. It integrates a dual-slope integrating ADC with a direct LED display driver, eliminating the need for external multiplexing or decoding logic. The device operates on a single power supply within the commercial temperature range of 0°C to 70°C. Housed in a 40-pin Dual In-Line Package (PDIP), it provides direct drive capabilities for seven-segment LED displays. This component is classified as obsolete and has been discontinued by the manufacturer.

ADCs/DACs - Special Purpose Feature Summary

• Integrates a 3½-digit dual-slope A/D converter with direct LED display driver
• Requires no external clock, multiplexer, or decoder circuits
• Operates from a single power supply with low current consumption
• Available in a 40-pin PDIP package for through-hole mounting

ADCs/DACs - Special Purpose Applications

• Digital panel meters
• Battery-powered instrumentation
• Industrial process control displays
• Portable test equipment

ADCs/DACs - Special Purpose Procurement Notes

The ICL7137CPL-3 is officially listed as obsolete and discontinued by Analog Devices Inc./Maxim Integrated. Availability is restricted to remaining stock from third-party distributors or surplus markets. Verification of part authenticity and physical condition is critical when sourcing from non-authorized channels. Buyers should confirm RoHS compliance status, as the -3 suffix may indicate specific environmental compliance variations compared to standard versions.

ADCs/DACs - Special Purpose Selection Notes

Select this component only if legacy compatibility with existing 3½-digit LED display designs is required. Ensure the application supports single-supply operation and does not demand higher resolution than 3½ digits. For new designs, consider modern delta-sigma ADCs or integrated display controllers that offer improved accuracy, lower power consumption, and active manufacturing status. Verify pinout compatibility if replacing older ICL7137 variants.

ADCs/DACs - Special Purpose Part Context

The ICL7137 belongs to the Maxim Integrated ICL7100 series of integrating ADCs, widely used in precision measurement applications before the prevalence of sigma-delta architectures. The CPL suffix denotes the 40-pin plastic DIP package. The -3 suffix typically indicates RoHS-compliant manufacturing. This family was instrumental in simplifying digital voltmeter designs by combining conversion and display driving functions into a single IC.

ADCs/DACs - Special Purpose Replacement Considerations

No direct public substitute part numbers are confirmed for this obsolete component. Designers may evaluate modern alternatives such as the ICL7129 or ICL7136 families, though pinouts and features differ. Cross-referencing with contemporary delta-sigma ADCs combined with separate microcontroller-based display drivers is recommended for new hardware development.