TLC549CD Equivalent & Substitute Parts

Part Overview

The TLC549CD is an 8-bit Analog to Digital Converter (ADC) manufactured by Texas Instruments, designed for single-ended input applications with a 40 kHz sampling rate. The device features a Successive Approximation Register (SAR) architecture with external reference capability and operates across 3V to 6V supply rails. The TLC549CD is classified as obsolete, making identification of compatible substitute components essential for ongoing system support and new design implementations.

Key Parameters

Parameter	TLC549CD
Number of Bits	8
Sampling Rate (Per Second)	40k
Number of Inputs	1
Input Type	Single Ended
Data Interface	SPI
Architecture	SAR
Reference Type	External
Voltage - Supply, Analog	3V ~ 6V
Voltage - Supply, Digital	3V ~ 6V
Operating Temperature	0°C ~ 70°C
Package / Case	8-SOIC
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the TLC549CD is determined by the following core electrical and mechanical parameters:

Resolution: 8-bit conversion capability
Sampling Rate: Minimum 40 kHz performance
Input Configuration: Single-ended input, 1 channel
Interface Protocol: SPI compatibility
Architecture: SAR-based conversion
Supply Voltage Compatibility: Operating range overlap with 3V to 6V
Package Compatibility: Surface mount form factor

The ADC081S021CIMF/NOPB qualifies as a direct substitute based on matching resolution, input configuration, interface protocol, and architecture. While the substitute offers enhanced specifications (200 kHz sampling rate, wider supply range, extended temperature range), these improvements maintain backward compatibility with TLC549CD applications.

Parameter Comparison

Parameter	TLC549CD	ADC081S021CIMF/NOPB	Compatibility
Number of Bits	8	8	Match
Sampling Rate (Per Second)	40k	200k	Substitute exceeds minimum
Number of Inputs	1	1	Match
Input Type	Single Ended	Single Ended	Match
Data Interface	SPI	SPI, DSP	Substitute supports SPI
Architecture	SAR	SAR	Match
Reference Type	External	Supply	Different reference architecture
Voltage - Supply, Analog	3V ~ 6V	2.7V ~ 5.25V	Overlapping range 3V ~ 5.25V
Voltage - Supply, Digital	3V ~ 6V	2.7V ~ 5.25V	Overlapping range 3V ~ 5.25V
Operating Temperature	0°C ~ 70°C	-40°C ~ 85°C	Substitute exceeds range
Package / Case	8-SOIC	SOT-23-6	Different package
Product Status	Obsolete	Active	Substitute actively manufactured
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Match

Engineering Selection Recommendations

The ADC081S021CIMF/NOPB is the manufacturer-recommended substitute for the obsolete TLC549CD. Selection of this substitute is supported by the following factors:

Product Status: The TLC549CD is obsolete, while ADC081S021CIMF/NOPB maintains active production status, ensuring long-term availability and supply chain continuity.
Regulatory Compliance: Both devices maintain ROHS3 compliance and REACH unaffected status, meeting current environmental and regulatory requirements.
Functional Compatibility: Core electrical specifications (8-bit resolution, single-ended input, SPI interface, SAR architecture) are identical between devices.
Performance Enhancement: The substitute provides superior sampling rate (200 kHz vs. 40 kHz) and extended operating temperature range (-40°C to 85°C vs. 0°C to 70°C), enabling broader application scope.
Supply Voltage Consideration: The overlapping supply voltage range (3V to 5.25V) accommodates most TLC549CD applications. Systems requiring operation above 5.25V require circuit redesign.
Package Transition: The shift from 8-SOIC to SOT-23-6 packaging necessitates PCB layout modification and component footprint redesign.

Frequently Asked Questions (FAQ)

Q: Can ADC081S021CIMF/NOPB directly replace TLC549CD in existing designs?

A: Functional substitution is possible for applications operating within the overlapping supply voltage range (3V to 5.25V). PCB layout modification is required due to different package types (8-SOIC to SOT-23-6). Reference voltage circuit redesign may be necessary due to the shift from external to supply-based reference architecture.

Q: What is the primary difference in reference voltage architecture?

A: The TLC549CD requires an external reference voltage input, providing design flexibility for precision applications. The ADC081S021CIMF/NOPB uses the supply voltage as the reference, simplifying circuit design but reducing reference voltage adjustment capability.

Q: Are there supply voltage limitations when substituting?

A: Yes. The TLC549CD operates from 3V to 6V, while the substitute operates from 2.7V to 5.25V. Applications requiring operation above 5.25V cannot use this substitute without circuit modification.

Q: Does the higher sampling rate of the substitute affect compatibility?

A: No. The 200 kHz sampling rate of ADC081S021CIMF/NOPB exceeds the 40 kHz requirement of the TLC549CD, maintaining backward compatibility. Existing firmware and signal processing algorithms require no modification.

Q: What packaging considerations apply to this substitution?

A: The TLC549CD uses 8-SOIC (0.154" width, 3.90mm) packaging, while the substitute uses SOT-23-6 packaging. These are physically incompatible, requiring complete PCB footprint redesign and layout modification.

Q: Are both devices RoHS compliant?

A: Yes. Both the TLC549CD and ADC081S021CIMF/NOPB are ROHS3 compliant and REACH unaffected, meeting current environmental regulations.

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