TLC556IDRG4 Equivalent & Substitute Parts

Part Overview

The TLC556IDRG4 is a dual timer/oscillator IC manufactured by Texas Instruments, operating at 2.1MHz with a 14-SOIC surface mount package. This device belongs to the 555 timer family and is classified as obsolete. Due to its obsolete status, identifying equivalent and substitute parts is necessary for ongoing design support, production continuity, and component sourcing in applications requiring dual timer functionality.

Substiute Parts

TLC556IDRG4

Texas InstrumentsIn Stock: 821TLC556IDRG4 Datasheet

Current PartRFQ

TLC556IDR

Texas InstrumentsIn Stock: 26486TLC556IDR Datasheet

Parametric EquivalentRFQ

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 TLC556IDRG4 are identified based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

• Package Type: 14-SOIC form factor (0.154", 3.90mm Width) for direct PCB compatibility
• Functional Type: 555 Type, Timer/Oscillator (Dual) configuration
• Supply Voltage Range: Overlap or compatibility with 3V ~ 15V operating range
• Mounting Type: Surface Mount technology
• RoHS Compliance: ROHS3 Compliant status for regulatory alignment

Substitute parts are grouped into two categories:

Parametric Equivalent: Parts with identical or overlapping electrical specifications and the same base product family (TLC556 series).

Manufacturer Recommended: Parts from alternative manufacturers (Analog Devices Inc./Maxim Integrated) that maintain 555 timer functionality and 14-SOIC packaging, though with different frequency and current specifications.

Parameter Comparison

Engineering Selection Recommendations

TLC556IDR is the primary parametric equivalent for the TLC556IDRG4. Both parts share identical electrical specifications (2.1MHz frequency, 720 µA supply current, -40°C ~ 85°C operating range) and are manufactured by Texas Instruments. The TLC556IDR is currently in active production status, making it the preferred direct replacement. Both parts maintain ROHS3 compliance and MSL Level 1 rating.

ICM7556ISD+ and ICM7556ISD+T are manufacturer-recommended alternatives from Analog Devices Inc./Maxim Integrated. These parts maintain the 555 timer dual configuration and 14-SOIC package compatibility. However, they operate at 500kHz frequency (lower than the TLC556IDRG4's 2.1MHz) and draw significantly lower supply current (60 µA versus 720 µA). The ICM7556 series supports a wider supply voltage range (2V ~ 16.5V) and operates across a narrower temperature range (-20°C ~ 85°C). Both ICM7556 variants are active products with ROHS3 compliance.

Selection between TLC556IDR and ICM7556 variants depends on application frequency requirements. Applications requiring 2.1MHz operation must use TLC556IDR. Applications tolerant of 500kHz operation may use ICM7556 variants, which offer lower power consumption benefits.

Frequently Asked Questions (FAQ)

Q: Can TLC556IDR directly replace TLC556IDRG4 on existing PCBs?

A: Yes. Both parts share identical 14-SOIC package dimensions, pinout, electrical specifications (2.1MHz, 720 µA, 3V ~ 15V), and operating temperature range (-40°C ~ 85°C). No circuit modifications are required.

Q: What is the primary difference between TLC556IDR and ICM7556ISD+ variants?

A: The TLC556IDR operates at 2.1MHz with 720 µA supply current. The ICM7556ISD+ and ICM7556ISD+T operate at 500kHz with 60 µA supply current. Both maintain 14-SOIC packaging and 555 timer functionality. Frequency and power consumption differences require application-level evaluation.

Q: Are ICM7556 parts suitable for applications originally designed for TLC556IDRG4?

A: ICM7556 parts are suitable only if the application can operate at 500kHz instead of 2.1MHz. The lower frequency and reduced supply current may benefit power-constrained designs. Circuit timing calculations must be re-evaluated for the lower frequency specification.

Q: What packaging options are available for these substitute parts?

A: TLC556IDR is available in Cut Tape (CT) and Digi-Reel packaging. ICM7556ISD+ is supplied in Tube packaging. ICM7556ISD+T is supplied in Tape & Reel (TR) packaging. All maintain the 14-SOIC form factor.

Q: Do all substitute parts meet the same compliance standards as TLC556IDRG4?

A: Yes. TLC556IDR, ICM7556ISD+, and ICM7556ISD+T are all ROHS3 compliant with MSL Level 1 rating. All parts are REACH unaffected and classified under ECCN EAR99.