Is there a pin-compatible replacement for TLC555CDR?

Yes, the TLC555QDR is a pin-compatible automotive-grade version. Other 555 timers in an SOIC-8 package, like the SE555DR, share the same standard pinout but have critical electrical differences that must be verified.

What risks should I check before replacing TLC555CDR?

The main risk is the minimum supply voltage; the TLC555 works down to 2V, while many standard 555 timers require 4.5V. Also check for differences in supply current and output voltage levels (CMOS vs. Bipolar).

TLC555CDR Alternatives, Datasheet & Cross Reference | Texas Instruments

The TLC555CDR is a popular LinCMOS timer from Texas Instruments in an SOIC-8 package, known for low-power operation down to 2V. Finding a suitable replacement requires matching the voltage range and package.

AI replacement insight

Electrical riskhigh

Most alternatives are Bipolar, not CMOS, and require >4.5V supply.

Package risklow

SOIC-8 is a standard package for 555 timers.

Can it be replaced directly?

The TLC555QDR is a direct, upgraded replacement. Other 555 timers are not direct replacements due to voltage and technology differences.

Best replacement path

Use the automotive-grade TLC555QDR for a robust, pin-compatible upgrade.

Main risk

Minimum supply voltage mismatch is the primary risk when considering alternatives outside the TLC555 family.

Recommended alternatives

Automotive-grade version with a wider temperature range and identical key parameters.

View details

Alternative comparison matrix

Feature / factor	TLC555CDR	TLC555QDR	SE555DR	Compatibility / risk
Package	8-Pin SOIC	SOIC-8	SOIC-8	SOIC-8 — Package matches.; SE555DR: Package matches.
Pinout	8	8	-	8 — Pin count matches; pinout assumed identical for same family.
Voltage	2 V to 15 V	2 V to 15 V	4.5 V to 18 V	2 V to 15 V / 4.5 V to 18 V — Supply voltage range is identical.; SE555DR: Minimum supply voltage is higher (4.5V vs 2V).
Temperature	0°C to 70°C	-40 °C to 125 °C	-55 °C to 125 °C	-40 °C to 125 °C / -55 °C to 125 °C — Candidate has a wider operating temperature range.; SE555DR: Candidate has a wider operating temperature range.
Application	Commercial	Automotive	-	Automotive — Candidate is an automotive grade version.
Technology	LinCMOS	-	Bipolar	Bipolar — Different technology affects power consumption and I/O levels.

Application & sourcing insights

Questions & answers

The TLC555QDR is an excellent upgrade, offering a wider temperature range in the same package. For applications that don't require operation below 4.5V, other 555 timers like the SE555DR could be considered with careful review.