TLC555IDRG4 Equivalent & Substitute Parts

Part Overview

The TLC555IDRG4 is a 555 Type Timer/Oscillator (Single) IC manufactured by Texas Instruments, operating at 2.1MHz with supply voltage range of 3V to 15V. This component is classified as Obsolete, which necessitates identification of equivalent and substitute parts for ongoing design requirements and production continuity. The 8-SOIC surface mount package and LinCMOS™ series characteristics define the substitution parameters for this device.

Key Parameters

Parameter	Value
Manufacturer Part Number	TLC555IDRG4
Manufacturer	Texas Instruments
Product Category	Clock/Timing - 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 of the TLC555IDRG4 is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Package / Case: 8-SOIC (0.154", 3.90mm Width) - mandatory for mechanical compatibility
Mounting Type: Surface Mount - required for PCB assembly compatibility
Device 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 compatible subset
RoHS Status: ROHS3 Compliant - regulatory requirement
Moisture Sensitivity Level: MSL 1 (Unlimited) - handling and storage compatibility

Secondary Consideration:

Frequency and Current Supply specifications determine application suitability within the 555 timer family

Substitutes are grouped by frequency capability and supply current characteristics, as these parameters define operational performance within timing and oscillator circuit designs.

Parameter Comparison

Part Number	Manufacturer	Frequency	Voltage - Supply	Current - Supply	Operating Temperature	Package / Case	Product Status
TLC555IDRG4	Texas Instruments	2.1MHz	3V ~ 15V	360 µA	-40°C ~ 85°C	8-SOIC	Obsolete
TLC555IDR	Texas Instruments	2.1MHz	3V ~ 15V	360 µA	-40°C ~ 85°C	8-SOIC	Active
LMC555CM/NOPB	Texas Instruments	3MHz	1.5V ~ 15V	150 µA	-40°C ~ 85°C	8-SOIC	Last Time Buy
LMC555CMX/NOPB	Texas Instruments	3MHz	1.5V ~ 15V	150 µA	-40°C ~ 85°C	8-SOIC	Active
LM555CM/NOPB	Texas Instruments	100kHz	4.5V ~ 16V	10 mA	0°C ~ 70°C	8-SOIC	Active
LM555CMX/NOPB	Texas Instruments	100kHz	4.5V ~ 16V	10 mA	0°C ~ 70°C	8-SOIC	Active
ALD7555SAL	Advanced Linear Devices Inc.	2.5MHz	2V ~ 10V	50 µA	0°C ~ 70°C	8-SOIC	Active
ICM7555CBAZ-T	Renesas Electronics Corporation	1MHz	2V ~ 18V	60 µA	0°C ~ 70°C	8-SOIC	Active
ICM7555IBAZ-T	Renesas Electronics Corporation	1MHz	2V ~ 18V	60 µA	-25°C ~ 85°C	8-SOIC	Active
ICM7555ESA+	Analog Devices Inc./Maxim Integrated	500kHz	2V ~ 16.5V	30 µA	-40°C ~ 85°C	8-SOIC	Active
ICM7555ESA+T	Analog Devices Inc./Maxim Integrated	500kHz	2V ~ 16.5V	30 µA	-40°C ~ 85°C	8-SOIC	Active

Engineering Selection Recommendations

Primary Recommendation: TLC555IDR

The TLC555IDR is the direct active equivalent to the obsolete TLC555IDRG4. 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). This part is manufactured by Texas Instruments and carries Active product status with ROHS3 compliance and MSL 1 rating. Inventory availability is substantial (305,200 pcs), ensuring supply continuity.

Secondary Recommendations by Application Requirements:

For applications requiring extended frequency capability with lower supply current, the LMC555CMX/NOPB (Active status, 3MHz, 150 µA) or LMC555CM/NOPB (Last Time Buy status, 3MHz, 150 µA) provide higher frequency operation within the same 8-SOIC package. Both maintain -40°C ~ 85°C temperature range and ROHS3 compliance.

For applications with lower voltage supply requirements (down to 1.5V), the LMC555 series variants support extended low-voltage operation while maintaining frequency and temperature specifications.

The ICM7555ESA+ and ICM7555ESA+T variants from Analog Devices Inc./Maxim Integrated offer the lowest supply current (30 µA) with -40°C ~ 85°C temperature range and extended voltage range (2V ~ 16.5V), suitable for power-constrained applications.

All recommended substitutes maintain ROHS3 compliance, MSL 1 rating, and 8-SOIC surface mount package compatibility with the original TLC555IDRG4.

Frequently Asked Questions (FAQ)

Q: Can TLC555IDR directly replace TLC555IDRG4 without circuit modification?

A: Yes. The TLC555IDR is electrically and mechanically identical to the TLC555IDRG4, differing only in product status (Active vs. Obsolete) and packaging format (Cut Tape & Digi-Reel vs. original packaging). No circuit modifications are required.

Q: What is the primary reason for substituting the TLC555IDRG4?

A: The TLC555IDRG4 is classified as Obsolete. The TLC555IDR provides continuity with identical specifications and Active product status, ensuring long-term availability and supply chain reliability.

Q: Are all substitute parts compatible with the same PCB footprint?

A: Yes. All listed substitute parts use the 8-SOIC (0.154", 3.90mm Width) package, ensuring mechanical and footprint compatibility. Surface mount assembly processes remain unchanged.

Q: How do frequency differences affect substitution suitability?

A: Frequency capability determines the maximum operating speed of timing and oscillator circuits. The TLC555IDRG4 operates at 2.1MHz. Substitutes with equal or higher frequency ratings (TLC555IDR at 2.1MHz, LMC555 series at 3MHz) are suitable for identical applications. Lower frequency substitutes (ICM7555 series at 500kHz to 1MHz) are suitable only if circuit timing requirements do not exceed their frequency specifications.

Q: What is the significance of supply current differences among substitutes?

A: Supply current affects power consumption and thermal management. The TLC555IDRG4 draws 360 µA. Substitutes with lower supply current (LMC555 series at 150 µA, ICM7555 series at 30-60 µA) reduce power dissipation, beneficial for battery-powered or thermally constrained applications. Higher current substitutes are not recommended for the TLC555IDRG4 replacement.

Q: Do all substitutes meet the same compliance and regulatory requirements?

A: Yes. All listed substitute parts carry ROHS3 compliance, MSL 1 (Unlimited) moisture sensitivity rating, and REACH Unaffected status, matching the regulatory profile of the TLC555IDRG4.

Q: What is the difference between cut tape and tube packaging formats?

A: Packaging format affects handling, storage, and assembly processes. Cut Tape (CT) & Digi-Reel format is optimized for automated pick-and-place assembly. Tube packaging is suitable for manual assembly or lower-volume applications. Both formats contain identical components; selection depends on production methodology and volume requirements.

Q: Can LM555CM/NOPB or LM555CMX/NOPB substitute for TLC555IDRG4?

A: These parts are functionally compatible 555 timer variants but have different operating specifications. The LM555 series operates at 100kHz (lower frequency), requires 4.5V minimum supply voltage (higher than TLC555IDRG4's 3V minimum), and supports only 0°C ~ 70°C temperature range (narrower than TLC555IDRG4's -40°C ~ 85°C). Substitution is suitable only if circuit requirements align with these constraints.

Q: Which substitute offers the best low-power performance?

A: The ICM7555ESA+ and ICM7555ESA+T variants provide the lowest supply current at 30 µA, with -40°C ~ 85°C temperature range and 2V ~ 16.5V supply voltage compatibility. These are optimal for power-constrained applications where frequency requirements do not exceed 500kHz.

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