TLC549CDRG4 Equivalent & Substitute Parts

Part Overview

The TLC549CDRG4 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 component operates with external voltage reference and supports analog and digital supply voltages ranging from 3V to 6V. The device is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new design implementations where this legacy component is no longer readily available or preferred.

Substiute Parts

TLC549CDRG4

Texas InstrumentsIn Stock: 13213TLC549CDRG4 Datasheet

Current PartRFQ

ADC081S021CIMFX/NOPB

Texas InstrumentsIn Stock: 744ADC081S021CIMFX/NOPB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the TLC549CDRG4 is determined by the following critical parameters that must be maintained or improved:

• Resolution: 8-bit ADC capability
• Input Configuration: Single-ended input with 1 converter
• Architecture: SAR (Successive Approximation Register)
• Data Interface: SPI compatibility
• Supply Voltage Range: Compatibility with 3V to 6V operation
• Sampling Rate: Minimum 40k samples per second
• Package Compatibility: Surface mount form factor
• Compliance: ROHS3 compliance and active product status

The ADC081S021CIMFX/NOPB qualifies as a direct substitute based on these parameters. While it features a different package type (SOT-23-6 versus 8-SOIC), improved specifications (200k sampling rate, wider supply range 2.7V ~ 5.25V, extended temperature range -40°C ~ 85°C), and active product status, it maintains all core functional requirements for 8-bit single-ended ADC conversion with SPI interface.

Parameter Comparison

Engineering Selection Recommendations

The ADC081S021CIMFX/NOPB is the qualified substitute for the TLC549CDRG4 based on the following engineering criteria:

Product Status: The substitute part maintains active product status with Texas Instruments, ensuring long-term availability and supply chain stability compared to the obsolete TLC549CDRG4.

Compliance: Both parts are ROHS3 compliant and REACH unaffected, maintaining regulatory compliance requirements for electronic component selection.

Functional Equivalence: The substitute maintains 8-bit resolution, single-ended input configuration, SAR architecture, and SPI data interface compatibility. The enhanced sampling rate (200k versus 40k) and extended supply voltage range (2.7V ~ 5.25V) provide improved operational flexibility without compromising backward compatibility in most applications.

Package Transition: The shift from 8-SOIC to SOT-23-6 requires PCB layout modification. The SOT-23-6 package offers a smaller footprint, which may benefit space-constrained designs.

Frequently Asked Questions (FAQ)

Q: Can the ADC081S021CIMFX/NOPB directly replace the TLC549CDRG4 without circuit modifications?

A: Functional replacement is possible due to matching 8-bit resolution, single-ended input, SAR architecture, and SPI interface. However, the package change from 8-SOIC to SOT-23-6 requires PCB layout redesign. The reference voltage implementation differs (external versus supply-referenced), which may require circuit adjustments depending on your application requirements.

Q: What are the key differences in electrical specifications?

A: The substitute offers improved sampling rate (200k versus 40k samples per second), wider supply voltage range (2.7V ~ 5.25V versus 3V ~ 6V), and extended operating temperature range (-40°C ~ 85°C versus 0°C ~ 70°C). These represent enhancements that maintain compatibility with the original specification envelope.

Q: Is the supply voltage range difference significant for my application?

A: The substitute's 2.7V minimum is lower than the original 3V minimum, providing broader low-voltage operation capability. The 5.25V maximum is slightly lower than the original 6V maximum. Verify your specific supply voltage requirements against both ranges to confirm compatibility.

Q: What is the impact of the reference voltage type change?

A: The TLC549CDRG4 uses external reference voltage, while the ADC081S021CIMFX/NOPB uses supply-referenced operation. This affects circuit design: external reference designs require modification to utilize the supply voltage as reference, or external reference circuitry must be adapted to the new device architecture.

Q: Are there pin-to-pin compatibility considerations?

A: No. The package change from 8-SOIC to SOT-23-6 results in different pinout configurations. Complete schematic and PCB redesign is required for this substitution.