TLC555ID Equivalent & Substitute Parts

Part Overview

The TLC555ID 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 TLC555ID operates across a wide supply voltage range of 3V to 15V with a supply current of 360 µA and supports operating temperatures from -40°C to 85°C. Finding equivalent and substitute parts is necessary due to the Last Time Buy status, which restricts long-term procurement options for new designs and production continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	TLC555ID
Manufacturer	Texas Instruments
Category	Clock/Timing
Type	555 Type, Timer/Oscillator (Single)
Frequency	2.1MHz
Voltage - Supply	3V ~ 15V
Current - Supply	360 µA
Operating Temperature	-40°C ~ 85°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 of the TLC555ID is determined by strict adherence to the following electrical and mechanical parameters:

Critical Parameters for Substitution:

Package / Case: 8-SOIC (0.154", 3.90mm Width) — mechanical compatibility required
Mounting Type: Surface Mount — PCB assembly compatibility
Type: 555 Type, Timer/Oscillator (Single) — functional equivalence
Voltage - Supply Range: Must encompass or overlap with 3V ~ 15V
Operating Temperature Range: Must support -40°C ~ 85°C or a subset thereof
RoHS Status: ROHS3 Compliant — regulatory compliance
Moisture Sensitivity Level: 1 (Unlimited) — handling and storage compatibility

Substitute parts are grouped into two categories based on frequency performance:

Group 1: Direct Frequency Match (2.1MHz) TLC555IDR maintains identical frequency specification and is the manufacturer-recommended direct replacement with Active product status.

Group 2: Frequency Variants (1MHz to 3MHz) Parts with different frequency ratings but compatible electrical and mechanical parameters. These require application-level verification of timing requirements.

Group 3: Extended Frequency Range (500kHz) Parts with lower frequency specifications but compatible supply voltage and temperature ranges.

Parameter Comparison

Part Number	Manufacturer	Frequency	Voltage - Supply	Current - Supply	Operating Temperature	Package / Case	Product Status	Packaging Type
TLC555ID	Texas Instruments	2.1MHz	3V ~ 15V	360 µA	-40°C ~ 85°C	8-SOIC	Last Time Buy	Tube
TLC555IDR	Texas Instruments	2.1MHz	3V ~ 15V	360 µA	-40°C ~ 85°C	8-SOIC	Active	Cut Tape (CT) & 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 (CT) & 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 (TR)
ALD7555SAL	Advanced Linear Devices Inc.	2.5MHz	2V ~ 10V	50 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 (CT) & 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 (CT) & Digi-Reel®
ICM7555IBAZ	Renesas Electronics Corporation	1MHz	2V ~ 18V	60 µA	-25°C ~ 85°C	8-SOIC	Active	Tube

Engineering Selection Recommendations

Primary Recommendation: TLC555IDR

TLC555IDR is the manufacturer-recommended direct substitute for TLC555ID. It maintains identical electrical specifications (2.1MHz frequency, 3V ~ 15V supply voltage, 360 µA supply current, -40°C ~ 85°C operating temperature) and package configuration (8-SOIC). The primary difference is product status: TLC555IDR is Active, ensuring long-term availability and procurement continuity. The packaging format differs (Cut Tape & Digi-Reel® versus Tube), which may require adjustment to procurement and assembly processes but does not affect electrical or mechanical compatibility.

Secondary Recommendations for Frequency-Dependent Applications:

LMC555CMX/NOPB is recommended for applications where slightly higher frequency capability (3MHz) is beneficial and lower supply current (150 µA versus 360 µA) is advantageous. This part maintains the full temperature range (-40°C ~ 85°C) and is Active status. The supply voltage range (1.5V ~ 15V) provides extended low-voltage capability.

ICM7555ESA+ and ICM7555ESA+T are recommended for applications requiring extended temperature range support (-40°C ~ 85°C) with lower supply current (30 µA). These parts operate at 500kHz and are suitable for timing applications where frequency precision is less critical than power efficiency.

Compliance Verification:

All recommended substitute parts maintain ROHS3 compliance and Moisture Sensitivity Level 1 (Unlimited), ensuring regulatory and handling compatibility with the original TLC555ID.

Frequently Asked Questions (FAQ)

Q: Can TLC555IDR be used as a direct replacement for TLC555ID?

A: Yes. TLC555IDR is the manufacturer-recommended direct substitute. Both parts share identical electrical specifications (2.1MHz, 3V ~ 15V, 360 µA, -40°C ~ 85°C) and 8-SOIC package. The only difference is packaging format (Cut Tape & Digi-Reel® versus Tube) and product status (Active versus Last Time Buy).

Q: What is the difference between TLC555ID and LMC555CM/NOPB?

A: Both are 555 Type timers in 8-SOIC packages with identical temperature ranges (-40°C ~ 85°C). Key differences are: LMC555CM/NOPB operates at 3MHz (versus 2.1MHz), has lower supply current (150 µA versus 360 µA), and lower minimum supply voltage (1.5V versus 3V). LMC555CM/NOPB is also Last Time Buy status. Application timing requirements determine suitability.

Q: Are all substitute parts in the same package?

A: Yes. All substitute parts listed use the 8-SOIC (0.154", 3.90mm Width) package with surface mount configuration. This ensures mechanical and PCB assembly compatibility. Packaging format (Tube, Cut Tape & Digi-Reel®, or Tape & Reel) differs but does not affect electrical or mechanical fit.

Q: Which substitute part has the lowest power consumption?

A: ICM7555ESA+ and ICM7555ESA+T have the lowest supply current at 30 µA. These parts operate at 500kHz and support the full temperature range (-40°C ~ 85°C). They are suitable for battery-powered or low-power timing applications.

Q: Can I use a substitute part with a different frequency rating?

A: Frequency substitution requires application-level verification. The TLC555ID operates at 2.1MHz. Substitute parts with different frequencies (100kHz, 500kHz, 1MHz, 2.5MHz, 3MHz) will produce different timing outputs. Use frequency variants only if your application timing requirements can accommodate the different frequency specification.

Q: What is the significance of "Last Time Buy" status?

A: Last Time Buy indicates the manufacturer will discontinue the part after a specified date. TLC555ID and LMC555CM/NOPB are Last Time Buy. TLC555IDR and other Active status parts ensure continued availability for future production and procurement.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed maintain ROHS3 compliance and Moisture Sensitivity Level 1 (Unlimited), ensuring regulatory and handling compatibility with the original TLC555ID.

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