TLC552CDR Equivalent & Substitute Parts

Part Overview

The TLC552CDR is a dual timer/oscillator IC manufactured by Texas Instruments, operating at 2.8MHz with a 14-SOIC surface mount package. This device is classified as a 555 Type timer in the LinCMOS™ series and is currently in Last Time Buy status, indicating production discontinuation. Finding equivalent substitute parts is necessary to ensure continued design support and component availability for new production runs and maintenance applications.

Substiute Parts

TLC552CDR

Texas InstrumentsIn Stock: 2519TLC552CDR Datasheet

Current PartRFQ

TLC556CDR

Texas InstrumentsIn Stock: 32720TLC556CDR Datasheet

MFR RecommendedRFQ

ICM7556ISD+

Analog Devices Inc./Maxim IntegratedIn Stock: 2740ICM7556ISD+ Datasheet

MFR RecommendedRFQ

ICM7556ISD+T

Analog Devices Inc./Maxim IntegratedIn Stock: 1428ICM7556ISD+T Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the TLC552CDR are qualified based on the following critical parameters:

Functional Compatibility: All substitute parts must be 555 Type timer/oscillator devices with dual channel configuration in 14-SOIC package format to ensure pin-for-pin compatibility and functional equivalence.

Electrical Parameters: Substitute parts must operate within overlapping voltage supply ranges and support the frequency requirements of the application. The TLC552CDR operates at 2.8MHz with supply voltage 1V ~ 18V; substitutes must accommodate these operating conditions or provide extended ranges.

Package Compatibility: All qualified substitutes use the 14-SOIC (0.154", 3.90mm Width) surface mount package, ensuring mechanical and electrical compatibility with existing PCB layouts.

Compliance Requirements: All substitute parts maintain ROHS3 compliance and MSL Level 1 rating, meeting regulatory and environmental standards equivalent to the original part.

Parameter Comparison

Engineering Selection Recommendations

TLC556CDR (Texas Instruments): This part is the manufacturer-recommended substitute from Texas Instruments. It maintains the same 14-SOIC package, operating temperature range (0°C ~ 70°C), and RoHS3 compliance as the TLC552CDR. The frequency specification is 2.1MHz, which is lower than the original 2.8MHz. The supply voltage range is 2V ~ 15V, which is narrower than the original 1V ~ 18V range. Current consumption is reduced to 720 µA. This substitute is suitable for applications where the lower frequency and reduced voltage range are acceptable, and it offers the advantage of Active product status with higher inventory availability.

ICM7556ISD+ and ICM7556ISD+T (Analog Devices Inc./Maxim Integrated): Both variants are functionally identical, differing only in packaging format (Tube versus Tape & Reel). These parts operate at 500kHz frequency with extended operating temperature range (-20°C ~ 85°C) and significantly reduced current consumption (60 µA). The supply voltage range is 2V ~ 16.5V. These substitutes are suitable for applications requiring lower frequency operation, extended temperature performance, or reduced power consumption. Both maintain ROHS3 compliance and Active product status.

Frequently Asked Questions (FAQ)

Q: Can TLC556CDR be used as a direct replacement for TLC552CDR?

A: TLC556CDR is pin-compatible and functionally equivalent as a 555 Type dual timer in the same 14-SOIC package. However, the frequency specification differs (2.1MHz versus 2.8MHz), and the supply voltage range is narrower (2V ~ 15V versus 1V ~ 18V). Substitution is valid only if your application can operate within these electrical parameters.

Q: What is the primary difference between ICM7556ISD+ and ICM7556ISD+T?

A: Both parts are electrically identical. The difference is packaging format: ICM7556ISD+ is supplied in Tube packaging, while ICM7556ISD+T is supplied in Tape & Reel (TR) format. Select based on your procurement and assembly requirements.

Q: Why does ICM7556ISD operate at 500kHz while TLC552CDR operates at 2.8MHz?

A: These are different device variants with different maximum frequency specifications. The ICM7556ISD is designed for lower frequency applications and offers significantly lower current consumption (60 µA versus 1.6 mA). Substitution is appropriate only if your circuit design can function at 500kHz.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts (TLC556CDR, ICM7556ISD+, and ICM7556ISD+T) maintain ROHS3 compliance and MSL Level 1 rating, meeting the same regulatory standards as the original TLC552CDR.

Q: What is the impact of the extended operating temperature range in ICM7556ISD variants?

A: ICM7556ISD variants operate from -20°C ~ 85°C, compared to TLC552CDR and TLC556CDR which operate from 0°C ~ 70°C. This extended range provides additional design flexibility for applications requiring operation in wider temperature environments.

Q: Can I use these substitutes interchangeably in the same circuit?

A: No. While all parts share the same 14-SOIC package and 555 Type architecture, they differ in frequency, voltage range, current consumption, and temperature range. Circuit compatibility depends on your specific application requirements. Verify that the substitute part's electrical specifications align with your design parameters before implementation.