TLC556IDG4

Overview

The TLC556IDG4 is a dual timer integrated circuit manufactured by Texas Instruments, belonging to the LinCMOS™ series. It integrates two independent 555-type timers within a single 14-pin SOIC package. The device operates on a supply voltage range of 3V to 15V with a typical supply current of 720 µA. It supports frequencies up to 2.1MHz and functions reliably across an industrial temperature range of -40°C to 85°C. This component serves as a low-power alternative to bipolar timer circuits.

Feature Summary

• Dual timer configuration integrating two independent 555-type oscillators in one package
• Low power consumption with 720 µA supply current
• Wide operating voltage range from 3V to 15V
• Industrial temperature rating spanning -40°C to 85°C

Applications

• DC-DC converters
• Alarm circuits
• Time delay generation
• Frequency division applications

Procurement Notes

Verify the presence of the 'G4' suffix, which indicates lead-free packaging compliant with RoHS3 standards. Confirm the package type is 14-SOIC (0.154 inch width) and ensure the temperature grade matches the industrial requirement (-40°C to 85°C). Cross-reference the manufacturer part number with distributor codes such as 296-26757-ND to ensure correct sourcing.

Selection Notes

Select the TLC556IDG4 when dual timer functionality is required with low power constraints. It is suitable for designs needing operation at lower voltages than standard bipolar timers, specifically down to 3V. Ensure the application does not require the higher output drive currents found in NE556 variants, as this CMOS device prioritizes low quiescent current over high sink/source capability.

Part Context

This component is part of the TLC556 family, which includes variants like the TLC556IDR (tape and reel) and TLC556CD (commercial temperature range). The IDG4 designation specifically denotes the industrial temperature grade and green (lead-free/halogen-free) packaging. It shares pinout compatibility with other 14-pin dual timer ICs but differs in electrical characteristics due to its CMOS technology.

Replacement Considerations

The TLC556DRG4 is a direct replacement variant differing only in packaging format (tube vs. tape and reel), assuming temperature grades align. For non-LinCMOS replacements, the NE556DR offers similar functionality but requires a minimum supply voltage of 4.5V and draws significantly higher current (20 mA).