TLC549IP Equivalent & Substitute Parts

Part Overview

The TLC549IP 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 operates with external voltage references and communicates via SPI interface. The TLC549IP is classified as obsolete, making identification of suitable substitute components essential for new designs and ongoing system support.

Substiute Parts

TLC549IP

Texas InstrumentsIn Stock: 3187TLC549IP Datasheet

Current PartRFQ

ADC081S021CIMF/NOPB

Texas InstrumentsIn Stock: 25912ADC081S021CIMF/NOPB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The ADC081S021CIMF/NOPB qualifies as a direct functional substitute for the TLC549IP based on the following core electrical parameters:

Matching Parameters:

• Resolution: 8-bit (identical)
• Number of Inputs: 1 (identical)
• Input Type: Single Ended (identical)
• Data Interface: SPI (compatible; ADC081S021 also supports DSP)
• Architecture: SAR (identical)
• Operating Temperature Range: -40°C ~ 85°C (identical)
• Compliance: ROHS3 Compliant, REACH Unaffected (both parts)

Allowable Differences:

• Sampling Rate: ADC081S021 operates at 200 kHz (exceeds TLC549IP requirement of 40 kHz)
• Supply Voltage Range: ADC081S021 operates at 2.7V ~ 5.25V (encompasses TLC549IP range of 3V ~ 6V with extended lower limit)
• Reference Type: ADC081S021 uses internal supply reference (versus external reference in TLC549IP)
• Package: ADC081S021 uses SOT-23-6 surface mount (versus 8-DIP through hole)
• Product Status: ADC081S021 is Active (versus Obsolete)

Parameter Comparison

Engineering Selection Recommendations

The ADC081S021CIMF/NOPB is the manufacturer-recommended substitute for the obsolete TLC549IP. Selection of this substitute is justified by:

Product Lifecycle: The TLC549IP is obsolete, while the ADC081S021CIMF/NOPB maintains active production status with 25,806 units in stock, ensuring long-term availability and supply chain continuity.

Electrical Compatibility: Both devices share identical 8-bit resolution, single-ended input configuration, SAR architecture, and SPI communication protocol. The ADC081S021 sampling rate of 200 kHz exceeds the TLC549IP requirement of 40 kHz, providing performance headroom. The supply voltage range of the ADC081S021 (2.7V ~ 5.25V) encompasses the TLC549IP operating range (3V ~ 6V) within the overlap region of 3V ~ 5.25V.

Regulatory Compliance: Both parts maintain ROHS3 compliance and REACH unaffected status, meeting current environmental and regulatory requirements.

Design Considerations: The primary design change involves package transition from 8-DIP through-hole to SOT-23-6 surface mount, requiring PCB layout modification. The reference voltage architecture change from external to supply-derived requires circuit design adjustment to accommodate internal reference operation.

Frequently Asked Questions (FAQ)

Q: Can the ADC081S021CIMF/NOPB directly replace the TLC549IP without circuit modifications?

A: Functional substitution is possible, but circuit modifications are required. The package change from 8-DIP to SOT-23-6 necessitates PCB redesign. The reference voltage architecture differs: TLC549IP uses external reference input, while ADC081S021 derives reference from supply voltage. Circuit design must accommodate this change.

Q: What is the impact of the higher sampling rate (200 kHz vs. 40 kHz) on system performance?

A: The increased sampling rate of the ADC081S021 exceeds system requirements and does not create incompatibility. Higher sampling capability provides design flexibility for future performance enhancements without component substitution.

Q: Are there supply voltage compatibility concerns between the two parts?

A: Within the overlap range of 3V to 5.25V, both parts operate at identical supply voltages. The TLC549IP specification extends to 6V, which exceeds the ADC081S021 maximum of 5.25V. System designs operating above 5.25V require voltage regulation or alternative component selection.

Q: What are the package mounting implications?

A: The TLC549IP uses through-hole 8-DIP packaging for manual or wave soldering assembly. The ADC081S021 uses surface-mount SOT-23-6 packaging, requiring reflow soldering and SMD assembly processes. PCB footprint and assembly method must be updated accordingly.

Q: Does the SPI interface remain compatible between the two devices?

A: Both devices support SPI communication protocol. The ADC081S021 additionally supports DSP interface. Existing SPI firmware and communication protocols remain compatible without modification.