TLC555QDR

Overview

The TLC555QDR is a single-channel CMOS timer manufactured by Texas Instruments, utilizing the LinCMOS process. It operates within a supply voltage range of 2 V to 15 V and supports frequencies up to 2.1 MHz. The device features low power consumption with a typical supply current of 250 µA at 5 V. It provides high output drive capability, sourcing 10 mA and sinking 100 mA. Packaged in an 8-SOIC surface-mount format, it functions as a direct pin-compatible replacement for NE555 timers while offering improved timing precision due to higher input impedance.

Feature Summary

• LinCMOS technology enabling operation from 2 V to 15 V with low power dissipation
• High output drive current: 100 mA sink and 10 mA source
• Frequency capability up to 2.1 MHz
• Direct pin-for-pin compatibility with NE555

Applications

• Precision timing circuits
• Pulse generation
• Sequential timing control
• Time delay generation

Procurement Notes

Verify the specific suffix 'QDR' indicates the SOIC-8 package and tape-and-reel shipping configuration. Confirm that the automotive qualification (Q1) aligns with the target application environment requirements. Check RoHS compliance status against regional regulatory standards before finalizing procurement orders.

Selection Notes

Select the TLC555QDR when a surface-mount solution is required for standard 555 timer applications. Ensure the operating temperature range meets system specifications, as commercial variants may differ from this automotive-grade component. Verify that the 2 V minimum supply voltage suits the lowest expected system rail.

Part Context

This component belongs to the TLC555 family of LinCMOS timers. It shares functional similarities with the TLC555CDR and TLC555CP but differs in packaging and thermal grade. The QDR variant specifically denotes the automotive-grade version housed in an 8-pin Small Outline Integrated Circuit package.

Replacement Considerations

The TLC555QDR serves as a drop-in replacement for the NE555 in most designs. For alternative TI options, consider the TLC555CDR for commercial temperature ranges or the TLC555CP for through-hole mounting requirements.