TLC549IPS Equivalent & Substitute Parts

Part Overview

The TLC549IPS 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 voltage reference and operates across a 3V to 6V supply range. The TLC549IPS is classified as obsolete, making identification of compatible substitute components essential for ongoing system support and new design implementations.

Substiute Parts

TLC549IPS

Texas InstrumentsIn Stock: 3627TLC549IPS Datasheet

Current PartRFQ

ADC081S021CIMF/NOPB

Texas InstrumentsIn Stock: 25912ADC081S021CIMF/NOPB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the TLC549IPS is determined by the following core electrical and mechanical parameters:

Critical Matching Parameters:

• Resolution: 8-bit ADC
• Input Configuration: Single-ended input, 1 channel
• Data Interface: SPI protocol compatibility
• Architecture: SAR-based conversion
• Operating Temperature: -40°C to 85°C range
• Supply Voltage Compatibility: Overlapping analog and digital supply ranges

Allowable Variations:

• Sampling rate may exceed the original specification (higher performance acceptable)
• Reference type may differ (internal supply reference acceptable for external reference designs with appropriate circuit modifications)
• Package form factor may change (surface mount packages acceptable)
• Supply voltage range may be narrower or wider, provided it encompasses the original operating range

The ADC081S021CIMF/NOPB qualifies as a direct substitute based on matching 8-bit resolution, single-ended input architecture, SPI interface, SAR topology, and compatible operating temperature range. The substitute offers enhanced sampling rate (200 kHz) and supply voltage flexibility (2.7V ~ 5.25V), with internal reference capability providing design flexibility.

Parameter Comparison

Engineering Selection Recommendations

The ADC081S021CIMF/NOPB is a qualified substitute for the obsolete TLC549IPS based on functional equivalence and regulatory compliance. Both devices maintain ROHS3 compliance and identical operating temperature specifications. The substitute is in active production status, ensuring long-term availability and supply chain stability compared to the obsolete original part.

The ADC081S021CIMF/NOPB provides enhanced performance characteristics with a 5x increase in sampling rate (200 kHz versus 40 kHz) and dual interface support (SPI and DSP). The narrower supply voltage range (2.7V ~ 5.25V) remains compatible with the original 3V ~ 6V specification within the overlapping 3V ~ 5.25V window. The internal supply reference eliminates the external reference requirement, simplifying circuit design while maintaining conversion accuracy.

Package transition from 8-SOIC to SOT-23-6 represents a reduction in physical footprint and pin count (8 pins to 6 pins), requiring PCB layout and schematic modifications. Pin function mapping must be verified during integration.

Frequently Asked Questions (FAQ)

Q: Can the ADC081S021CIMF/NOPB directly replace the TLC549IPS without circuit modifications?

A: Functional substitution is possible due to matching 8-bit resolution, single-ended input, SPI interface, and SAR architecture. However, package differences (8-SOIC to SOT-23-6) and pin count reduction (8 to 6 pins) require PCB layout redesign and schematic verification. The internal reference in the substitute eliminates the external reference circuit requirement, potentially simplifying the design.

Q: What are the key electrical differences between these devices?

A: The primary differences are sampling rate (40 kHz to 200 kHz), reference implementation (external to internal supply), and supply voltage range (3V ~ 6V to 2.7V ~ 5.25V). The overlapping supply range (3V ~ 5.25V) ensures compatibility in most applications. Both devices maintain identical 8-bit resolution, single-ended input configuration, and -40°C to 85°C operating temperature range.

Q: Is the ADC081S021CIMF/NOPB suitable for applications requiring the original 40 kHz sampling rate?

A: Yes. The substitute's 200 kHz sampling rate exceeds the original specification, providing performance headroom. Applications designed for 40 kHz operation will function correctly with the higher-performance substitute.

Q: What compliance certifications apply to both devices?

A: Both the TLC549IPS and ADC081S021CIMF/NOPB are ROHS3 compliant and REACH unaffected. Both carry EAR99 export classification and identical HTSUS commodity codes (8542.39.0001).

Q: How does the package change affect implementation?

A: The transition from 8-SOIC (0.209" width, 5.30mm) to SOT-23-6 represents a smaller surface mount package. Pin assignments differ, requiring schematic and PCB redesign. The reduced pin count (6 versus 8) reflects the elimination of external reference pins in the supply-referenced design.