TLC555CD Equivalent & Substitute Parts

Part Overview

The TLC555CD is a 555 Type Timer/Oscillator (Single) IC manufactured by Texas Instruments, operating at 2.1MHz in an 8-SOIC surface mount package. This device is classified as Last Time Buy, indicating limited future availability. The LinCMOS™ series design provides low power consumption at 360 µA supply current with a wide supply voltage range of 2V to 15V and operating temperature range of 0°C to 70°C. Substitute parts are necessary due to product status transition and to ensure design continuity with alternative packaging options and performance characteristics.

Key Parameters

Parameter	Value
Manufacturer Part Number	TLC555CD
Manufacturer	Texas Instruments
Category	Clock/Timing
Type	555 Type, Timer/Oscillator (Single)
Frequency	2.1MHz
Voltage - Supply	2V ~ 15V
Current - Supply	360 µA
Operating Temperature	0°C ~ 70°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Last Time Buy

Substitute Part Grouping Explanation

Substitution logic for the TLC555CD is determined by the following critical parameters: package type (8-SOIC), mounting method (Surface Mount), functional category (555 Type Timer/Oscillator Single), and electrical compatibility within specified voltage and temperature ranges. Substitute parts are grouped into two categories based on frequency performance and supply current characteristics:

Category 1: Direct Frequency Match (2.1MHz - 2.5MHz) Parts operating at or near 2.1MHz frequency with comparable supply current and voltage ranges ensure minimal circuit redesign. TLC555CDR provides identical electrical specifications with alternative packaging. ALD7555SAL operates at 2.5MHz with reduced supply current (50 µA) and narrower voltage range (2V ~ 10V).

Category 2: Extended Frequency Range (1MHz - 3MHz) Parts with different frequency ratings but compatible 8-SOIC packaging and surface mount configuration. These include ICM7555 series (1MHz), LMC555 series (3MHz), and ICM7555ESA+ (500kHz). Frequency differences require circuit timing constant recalculation but maintain functional compatibility.

All substitute parts share: 8-SOIC package, surface mount configuration, ROHS3 compliance, MSL Level 1, and EAR99 export classification.

Parameter Comparison

Part Number	Manufacturer	Frequency	Voltage - Supply	Current - Supply	Operating Temperature	Package / Case	Product Status	Packaging Type
TLC555CD	Texas Instruments	2.1MHz	2V ~ 15V	360 µA	0°C ~ 70°C	8-SOIC	Last Time Buy	Tube
TLC555CDR	Texas Instruments	2.1MHz	2V ~ 15V	360 µA	0°C ~ 70°C	8-SOIC	Active	Cut Tape & Digi-Reel
LM555CM/NOPB	Texas Instruments	100kHz	4.5V ~ 16V	10 mA	0°C ~ 70°C	8-SOIC	Active	Tube
LM555CMX/NOPB	Texas Instruments	100kHz	4.5V ~ 16V	10 mA	0°C ~ 70°C	8-SOIC	Active	Cut Tape & Digi-Reel
LMC555CM/NOPB	Texas Instruments	3MHz	1.5V ~ 15V	150 µA	-40°C ~ 85°C	8-SOIC	Last Time Buy	Tube
LMC555CMX/NOPB	Texas Instruments	3MHz	1.5V ~ 15V	150 µA	-40°C ~ 85°C	8-SOIC	Active	Tape & Reel
ALD7555SAL	Advanced Linear Devices Inc.	2.5MHz	2V ~ 10V	50 µA	0°C ~ 70°C	8-SOIC	Active	Tube
ICM7555CBAZ	Renesas Electronics Corporation	1MHz	2V ~ 18V	60 µA	0°C ~ 70°C	8-SOIC	Active	Tube
ICM7555CBAZ-T	Renesas Electronics Corporation	1MHz	2V ~ 18V	60 µA	0°C ~ 70°C	8-SOIC	Active	Cut Tape & Digi-Reel
ICM7555ESA+	Analog Devices Inc./Maxim Integrated	500kHz	2V ~ 16.5V	30 µA	-40°C ~ 85°C	8-SOIC	Active	Tube
ICM7555ESA+T	Analog Devices Inc./Maxim Integrated	500kHz	2V ~ 16.5V	30 µA	-40°C ~ 85°C	8-SOIC	Active	Cut Tape & Digi-Reel

Engineering Selection Recommendations

Primary Recommendation: TLC555CDR TLC555CDR is the manufacturer-recommended direct substitute, offering identical electrical specifications (2.1MHz, 2V ~ 15V, 360 µA) with Active product status and expanded inventory (105,300 pcs). The only difference is packaging format (Cut Tape & Digi-Reel vs. Tube), which does not affect electrical performance. This selection eliminates circuit redesign requirements.

Secondary Recommendation: LMC555CMX/NOPB For applications requiring extended temperature range (-40°C ~ 85°C) and Active product status with high inventory (31,756 pcs), LMC555CMX/NOPB operates at 3MHz with lower supply current (150 µA). Circuit timing constants require recalculation due to frequency difference. Tape & Reel packaging supports automated assembly.

Alternative Recommendation: ICM7555CBAZ-T For designs prioritizing low supply current (60 µA) and wide supply voltage range (2V ~ 18V), ICM7555CBAZ-T from Renesas provides Active status with high inventory (51,420 pcs). Operating frequency of 1MHz requires timing circuit adjustment. Cut Tape & Digi-Reel packaging supports production environments.

All recommended substitutes maintain ROHS3 compliance, MSL Level 1 rating, and 8-SOIC package compatibility with the original TLC555CD.

Frequently Asked Questions (FAQ)

Q: Can TLC555CDR directly replace TLC555CD without circuit modification? A: Yes. TLC555CDR provides identical electrical specifications: 2.1MHz frequency, 2V ~ 15V supply voltage, 360 µA supply current, and 0°C ~ 70°C operating temperature. The only difference is packaging format (Cut Tape & Digi-Reel instead of Tube), which does not affect electrical performance or pin configuration.

Q: What circuit changes are required when substituting with LMC555CMX/NOPB? A: LMC555CMX/NOPB operates at 3MHz instead of 2.1MHz. Timing constants (resistor and capacitor values) in astable and monostable configurations must be recalculated based on the new frequency. The 8-SOIC pinout remains identical, so PCB layout changes are not required. Extended temperature range (-40°C ~ 85°C) may benefit temperature-sensitive applications.

Q: Are all substitute parts compatible with the same PCB footprint? A: Yes. All substitute parts use the 8-SOIC (0.154", 3.90mm Width) package with identical pin configuration. PCB footprints and land patterns are interchangeable without modification.

Q: What is the difference between Tube and Cut Tape & Digi-Reel packaging? A: Tube packaging is suitable for manual assembly and small-volume production. Cut Tape & Digi-Reel packaging supports automated pick-and-place assembly equipment and high-volume manufacturing. Electrical specifications and performance are identical; packaging choice depends on assembly process requirements.

Q: Which substitute offers the lowest power consumption? A: ICM7555ESA+ and ICM7555ESA+T offer the lowest supply current at 30 µA, compared to TLC555CD at 360 µA. However, these parts operate at 500kHz, requiring significant timing circuit recalculation. ALD7555SAL provides moderate power reduction (50 µA) with closer frequency match (2.5MHz).

Q: Can I use LM555CM/NOPB as a substitute? A: LM555CM/NOPB is functionally compatible but operates at 100kHz with significantly higher supply current (10 mA) and different voltage range (4.5V ~ 16V). Timing circuits require substantial recalculation. This part is suitable only for low-frequency applications where the performance trade-offs are acceptable.

Q: What compliance certifications do all substitute parts share? A: All substitute parts maintain ROHS3 compliance, Moisture Sensitivity Level 1 (Unlimited), and EAR99 export classification, matching the original TLC555CD specifications.

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