TLC549CDR Equivalent & Substitute Parts

Part Overview

The TLC549CDR is an 8-bit Analog to Digital Converter (ADC) manufactured by Texas Instruments, designed for single-ended input applications with a 1 SAR architecture and SPI data interface. This device is classified as obsolete, making equivalent and substitute parts necessary for new designs and production continuity. The TLC549CDR operates with external voltage references and supports analog and digital supply voltages ranging from 3V to 6V, with a sampling rate of 40k samples per second in an 8-SOIC surface mount package.

Substiute Parts

TLC549CDR

Texas InstrumentsIn Stock: 15570TLC549CDR Datasheet

Current PartRFQ

ADC081S021CIMFX/NOPB

Texas InstrumentsIn Stock: 744ADC081S021CIMFX/NOPB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the TLC549CDR is determined by the following critical parameters:

• Resolution: 8-bit ADC architecture
• Input Configuration: Single-ended input with 1 converter
• Conversion Method: Successive Approximation Register (SAR)
• Communication Protocol: SPI interface capability
• Supply Voltage Range: Compatibility with 3V to 6V analog and digital supplies
• Package Type: Surface mount configuration

The ADC081S021CIMFX/NOPB qualifies as a direct substitute based on matching these core electrical and functional parameters. While the substitute part offers enhanced specifications (higher sampling rate, wider supply voltage range, extended temperature range, and supply-referenced architecture), it maintains backward compatibility with the primary functional requirements of the TLC549CDR.

Parameter Comparison

Engineering Selection Recommendations

The ADC081S021CIMFX/NOPB is the recommended substitute for the obsolete TLC549CDR. Both devices are manufactured by Texas Instruments and maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory consistency.

The substitute part is currently in active production status, providing long-term availability and supply chain stability compared to the obsolete TLC549CDR. The ADC081S021CIMFX/NOPB operates within the supply voltage range of the original part (with extended lower limit compatibility at 2.7V) and maintains the same 8-bit resolution, single-ended input configuration, and SAR architecture.

Design considerations include package transition from 8-SOIC to SOT-23-6, which requires PCB layout modifications. The substitute part's higher sampling rate (200k vs. 40k samples per second) and extended operating temperature range (-40°C to 85°C vs. 0°C to 70°C) provide performance headroom for demanding applications.

Frequently Asked Questions (FAQ)

Q: Can the ADC081S021CIMFX/NOPB directly replace the TLC549CDR without circuit modifications?

A: The ADC081S021CIMFX/NOPB maintains functional compatibility in terms of resolution, input configuration, and SPI interface. However, the package change from 8-SOIC to SOT-23-6 requires PCB layout redesign. The reference voltage architecture differs (external vs. supply-referenced), which may require adjustments to reference circuit design.

Q: What are the key differences in supply voltage specifications?

A: The TLC549CDR operates at 3V to 6V for both analog and digital supplies. The ADC081S021CIMFX/NOPB operates at 2.7V to 5.25V, providing lower voltage operation capability while maintaining compatibility within the original part's voltage range.

Q: How does the sampling rate difference affect system design?

A: The ADC081S021CIMFX/NOPB provides a 5x higher sampling rate (200k vs. 40k samples per second). This enhancement allows for faster data acquisition and improved signal fidelity in time-sensitive applications, though it does not impact compatibility with systems designed for the original 40k sampling rate.

Q: Are there temperature range considerations for substitution?

A: The TLC549CDR operates from 0°C to 70°C, while the ADC081S021CIMFX/NOPB operates from -40°C to 85°C. The substitute part supports extended temperature operation, making it suitable for industrial and automotive applications requiring wider temperature ranges.

Q: What is the impact of the package change on production?

A: The transition from 8-SOIC to SOT-23-6 requires PCB redesign, including trace routing and component placement modifications. SOT-23-6 is a smaller package, potentially reducing board space requirements. Assembly equipment compatibility should be verified with manufacturing partners.