TLC556CDG4 Equivalent & Substitute Parts

Part Overview

The TLC556CDG4 is a dual timer/oscillator IC manufactured by Texas Instruments, operating at 2.1MHz with LinCMOS™ technology. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The TLC556CDG4 is packaged in 14-SOIC surface mount configuration and operates across a 2V to 15V supply voltage range with 720µA supply current.

Substiute Parts

TLC556CDG4

Texas InstrumentsIn Stock: 972TLC556CDG4 Datasheet

Current PartRFQ

TLC556CD

Texas InstrumentsIn Stock: 2559TLC556CD 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

Substitution for the TLC556CDG4 is determined by the following critical parameters:

Primary Compatibility Criteria:

• Package type: 14-SOIC surface mount configuration
• Functional classification: 555 Type, Timer/Oscillator (Dual)
• Supply voltage range: Minimum 2V, maximum 15V or higher
• Operating temperature range: Must support 0°C to 70°C minimum
• RoHS3 compliance and MSL Level 1 rating

Substitute Categories:

Category 1 - Direct Equivalent (Active Status): TLC556CD represents the active production equivalent from Texas Instruments. This part maintains identical electrical specifications, frequency rating (2.1MHz), supply current (720µA), and package configuration. The primary difference is packaging format (Tube vs. standard).

Category 2 - Functional Alternatives (Extended Specifications): ICM7556ISD+ and ICM7556ISD+T from Analog Devices Inc./Maxim Integrated are 555 Type dual timer/oscillators in identical 14-SOIC packaging. These parts operate at 500kHz frequency with lower supply current (60µA) and extended operating temperature range (-20°C to 85°C). Supply voltage range extends to 16.5V maximum, providing broader compatibility envelope.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Preferred): Select TLC556CD when the design requires exact electrical and frequency specifications matching the original TLC556CDG4. This part is in active production status from Texas Instruments, ensuring long-term availability and supply chain stability. Both parts maintain identical 2.1MHz frequency, 720µA supply current, and 0°C to 70°C operating temperature range. RoHS3 compliance and MSL Level 1 rating are maintained.

For Extended Operating Conditions: Select ICM7556ISD+ or ICM7556ISD+T when the application benefits from extended operating temperature range (-20°C to 85°C) or lower supply current consumption (60µA). These parts are suitable for designs where frequency operation at 500kHz is acceptable and where the extended supply voltage range (up to 16.5V) provides system margin. Both variants maintain 14-SOIC packaging and RoHS3 compliance.

Packaging Consideration: ICM7556ISD+T is supplied in Tape & Reel format, suitable for high-volume automated assembly. ICM7556ISD+ is supplied in Tube format. TLC556CD is supplied in Tube format. Select packaging format based on procurement volume and assembly process requirements.

Frequently Asked Questions (FAQ)

Q: Can TLC556CD be used as a direct replacement for TLC556CDG4? A: Yes. TLC556CD is the active production equivalent from Texas Instruments with identical electrical specifications, frequency rating (2.1MHz), supply current (720µA), operating temperature range (0°C to 70°C), and 14-SOIC package configuration. The primary difference is packaging format.

Q: What are the key differences between TLC556CD and ICM7556ISD+? A: TLC556CD operates at 2.1MHz with 720µA supply current and 0°C to 70°C temperature range. ICM7556ISD+ operates at 500kHz with 60µA supply current and -20°C to 85°C temperature range. Both use identical 14-SOIC packaging. Frequency and supply current specifications differ; select based on application requirements.

Q: Are all substitute parts RoHS3 compliant? A: Yes. TLC556CD, ICM7556ISD+, and ICM7556ISD+T are all ROHS3 compliant with MSL Level 1 rating, matching the original TLC556CDG4 compliance status.

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

Q: Can ICM7556ISD+ be used in applications requiring 2.1MHz operation? A: No. ICM7556ISD+ operates at 500kHz maximum frequency, not 2.1MHz. Use TLC556CD for applications requiring 2.1MHz operation. ICM7556ISD+ is suitable only for applications where 500kHz frequency is acceptable.

Q: What supply voltage range do these parts support? A: TLC556CD supports 2V to 15V. ICM7556ISD+ and ICM7556ISD+T support 2V to 16.5V, providing extended upper voltage margin.