TLC555IDG4 Equivalent & Substitute Parts

Part Overview

The TLC555IDG4 is a 555 Type Timer/Oscillator (Single) IC manufactured by Texas Instruments, operating at 2.1MHz in an 8-SOIC surface mount package. This LinCMOS™ series device is classified as Last Time Buy, indicating limited future availability. Finding equivalent and substitute parts is necessary to ensure design continuity and long-term supply chain reliability for applications requiring timer and oscillator functionality.

Key Parameters

Parameter	TLC555IDG4
Manufacturer	Texas Instruments
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)

Substitute Part Grouping Explanation

Substitution for the TLC555IDG4 is determined by the following critical parameters:

Package Compatibility: All substitutes must use 8-SOIC (0.154", 3.90mm Width) surface mount packaging to ensure PCB layout compatibility
Functional Type: All substitutes must be 555 Type Timer/Oscillator (Single) ICs with equivalent pinout and functional behavior
Voltage Supply Range: Substitute parts must support the application's supply voltage requirements within the range of 3V to 15V
Operating Temperature Range: Substitute parts must cover or exceed the required temperature range (-40°C to 85°C)
Compliance Standards: All substitutes must maintain ROHS3 compliance and MSL 1 rating

Substitutes are grouped into two categories based on frequency capability and supply current characteristics:

Group 1 - Direct Frequency Match (2.1MHz - 3MHz): TLC555ID, LMC555CM/NOPB, LMC555CMX/NOPB, ALD7555SAL. These parts operate at or near the original frequency specification.

Group 2 - Lower Frequency Operation (500kHz - 1MHz): ICM7555CBAZ-T, ICM7555ESA+, ICM7555ESA+T, ICM7555IBAZ-T. These parts operate at reduced frequencies but maintain 555 Type functionality and compatible packaging.

Group 3 - Standard Frequency (100kHz): LM555CM/NOPB, LM555CMX/NOPB. These parts operate at lower frequency with different supply current characteristics.

Parameter Comparison

Part Number	Manufacturer	Frequency	Voltage - Supply	Current - Supply	Operating Temperature	Package / Case	Product Status	RoHS Status
TLC555IDG4	Texas Instruments	2.1MHz	3V ~ 15V	360 µA	-40°C ~ 85°C	8-SOIC	Last Time Buy	ROHS3 Compliant
TLC555ID	Texas Instruments	2.1MHz	3V ~ 15V	360 µA	-40°C ~ 85°C	8-SOIC	Last Time Buy	ROHS3 Compliant
LMC555CM/NOPB	Texas Instruments	3MHz	1.5V ~ 15V	150 µA	-40°C ~ 85°C	8-SOIC	Last Time Buy	ROHS3 Compliant
LMC555CMX/NOPB	Texas Instruments	3MHz	1.5V ~ 15V	150 µA	-40°C ~ 85°C	8-SOIC	Active	ROHS3 Compliant
LM555CM/NOPB	Texas Instruments	100kHz	4.5V ~ 16V	10 mA	0°C ~ 70°C	8-SOIC	Active	ROHS3 Compliant
LM555CMX/NOPB	Texas Instruments	100kHz	4.5V ~ 16V	10 mA	0°C ~ 70°C	8-SOIC	Active	ROHS3 Compliant
ALD7555SAL	Advanced Linear Devices Inc.	2.5MHz	2V ~ 10V	50 µA	0°C ~ 70°C	8-SOIC	Active	ROHS3 Compliant
ICM7555CBAZ-T	Renesas Electronics Corporation	1MHz	2V ~ 18V	60 µA	0°C ~ 70°C	8-SOIC	Active	ROHS3 Compliant
ICM7555ESA+	Analog Devices Inc./Maxim Integrated	500kHz	2V ~ 16.5V	30 µA	-40°C ~ 85°C	8-SOIC	Active	ROHS3 Compliant
ICM7555ESA+T	Analog Devices Inc./Maxim Integrated	500kHz	2V ~ 16.5V	30 µA	-40°C ~ 85°C	8-SOIC	Active	ROHS3 Compliant
ICM7555IBAZ-T	Renesas Electronics Corporation	1MHz	2V ~ 18V	60 µA	-25°C ~ 85°C	8-SOIC	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitute - TLC555ID: This part is the direct equivalent to TLC555IDG4, differing only in packaging format (Tube vs. Digi-Reel). It maintains identical electrical specifications and is from the same manufacturer. Recommended for applications requiring exact parameter matching with Last Time Buy status acceptance.

Secondary Substitutes - LMC555CM/NOPB and LMC555CMX/NOPB: These Texas Instruments parts operate at 3MHz, slightly above the original 2.1MHz specification, with lower supply current (150 µA vs. 360 µA). LMC555CMX/NOPB carries Active product status, providing better long-term availability. Both support the full -40°C to 85°C temperature range and maintain ROHS3 compliance. The lower supply voltage floor (1.5V) provides additional design flexibility.

Alternative - ICM7555ESA+ and ICM7555ESA+T: These Analog Devices/Maxim parts offer Active product status with extended temperature range coverage (-40°C to 85°C). Operating at 500kHz with significantly lower supply current (30 µA), they are suitable for low-power applications. ICM7555ESA+T provides Cut Tape & Digi-Reel packaging for higher volume requirements.

Extended Temperature Option - ICM7555IBAZ-T: This Renesas part extends the lower operating temperature to -25°C while maintaining the upper limit at 85°C. Operating at 1MHz with 60 µA supply current, it is suitable for applications requiring enhanced cold-temperature performance.

Low-Power Alternative - ALD7555SAL: Advanced Linear Devices offers this 2.5MHz part with the lowest supply current (50 µA) among substitutes. However, the reduced voltage supply range (2V to 10V) and narrower operating temperature (0°C to 70°C) limit applicability to specific low-power, moderate-temperature designs.

Standard Frequency Options - LM555CM/NOPB and LM555CMX/NOPB: These parts operate at 100kHz with Active product status. The significantly higher supply current (10 mA) and narrower operating temperature range (0°C to 70°C) make them suitable only for applications where lower frequency operation is acceptable and temperature requirements are less stringent.

Frequently Asked Questions (FAQ)

Q: Can TLC555ID be used as a direct replacement for TLC555IDG4?

A: Yes. TLC555ID is electrically and functionally identical to TLC555IDG4. The only difference is packaging format (Tube vs. Digi-Reel). Both maintain the same 2.1MHz frequency, 3V to 15V supply voltage range, 360 µA supply current, and -40°C to 85°C operating temperature. Pin configuration and functional behavior are identical.

Q: What is the primary reason to consider LMC555CM/NOPB or LMC555CMX/NOPB?

A: These parts offer Active product status, ensuring longer availability compared to the Last Time Buy status of TLC555IDG4. They operate at 3MHz (slightly higher than 2.1MHz) with lower supply current consumption (150 µA vs. 360 µA). Both maintain the full -40°C to 85°C temperature range and ROHS3 compliance. LMC555CMX/NOPB is preferred for higher-volume applications due to Tape & Reel packaging.

Q: Are lower-frequency substitutes like ICM7555ESA+ suitable for my application?

A: Lower-frequency substitutes are suitable only if your circuit design can operate at reduced frequency. The ICM7555ESA+ operates at 500kHz compared to the original 2.1MHz. While it offers Active status, extended temperature range (-40°C to 85°C), and significantly lower supply current (30 µA), frequency compatibility must be verified against circuit requirements. Timing-critical applications may not tolerate this reduction.

Q: What is the difference between ICM7555CBAZ-T and ICM7555IBAZ-T?

A: Both are Renesas 1MHz timer ICs in 8-SOIC packaging with 60 µA supply current and 2V to 18V supply voltage range. The primary difference is operating temperature: ICM7555CBAZ-T operates from 0°C to 70°C, while ICM7555IBAZ-T extends the lower limit to -25°C. Select ICM7555IBAZ-T for applications requiring enhanced cold-temperature performance.

Q: Does packaging format affect electrical performance?

A: No. Packaging format (Tube, Cut Tape & Digi-Reel, or Tape & Reel) does not affect electrical performance or functional behavior. Format selection is based on handling, storage, and assembly process requirements. All 8-SOIC packages maintain identical pinout and electrical characteristics.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, matching the original TLC555IDG4 specifications.

Q: Which substitute offers the best long-term availability?

A: LMC555CMX/NOPB and ICM7555ESA+T carry Active product status, indicating ongoing manufacturing and support. These parts are recommended for new designs requiring extended supply chain reliability. Avoid Last Time Buy parts (TLC555IDG4, TLC555ID, LMC555CM/NOPB) for new long-term applications.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message