TLC548ID Equivalent & Substitute Parts

Part Overview

The TLC548ID is an 8-bit Analog to Digital Converter (ADC) manufactured by Texas Instruments, designed for single-ended input applications with SPI data interface. This component features a Successive Approximation Register (SAR) architecture with a sampling rate of 45.5k samples per second and operates across a supply voltage range of 3V to 6V for both analog and digital domains. The device is packaged in an 8-SOIC surface mount package.

The TLC548ID is classified as obsolete, making equivalent and substitute parts necessary for new designs, production continuity, and system upgrades. Identifying compatible alternatives ensures design flexibility while maintaining functional and electrical compatibility.

Substiute Parts

TLC548ID

Texas InstrumentsIn Stock: 2094TLC548ID Datasheet

Current PartRFQ

ADC081S021CIMF/NOPB

Texas InstrumentsIn Stock: 25912ADC081S021CIMF/NOPB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the TLC548ID is determined by the following critical parameters:

Core Functional Requirements:

• Resolution: 8-bit ADC capability
• Input Configuration: Single-ended input, 1 channel
• Interface Protocol: SPI compatibility
• Architecture: SAR-based conversion

Electrical Compatibility Criteria:

• Supply voltage ranges must encompass or be compatible with the original 3V ~ 6V specification
• Operating temperature range: -40°C ~ 85°C
• Conversion architecture: SAR topology

Physical Considerations:

• Surface mount technology
• Package form factor compatibility with PCB layout constraints

The ADC081S021CIMF/NOPB qualifies as a manufacturer-recommended substitute based on matching core functional parameters (8-bit resolution, single-ended input, SPI interface, SAR architecture) while offering enhanced performance characteristics and active product status.

Parameter Comparison

Engineering Selection Recommendations

The ADC081S021CIMF/NOPB is the manufacturer-recommended substitute for the obsolete TLC548ID. Selection of this alternative is supported by the following engineering factors:

Product Status and Availability: The TLC548ID is classified as obsolete, creating supply chain risk for ongoing production and maintenance. The ADC081S021CIMF/NOPB maintains active manufacturing status with substantial inventory availability (25,806 pieces in stock), ensuring long-term component sourcing.

Regulatory and Compliance Alignment: Both components maintain ROHS3 compliance and REACH unaffected status, satisfying environmental and regulatory requirements. ECCN classification (EAR99) and HTSUS codes (8542.39.0001) are identical, indicating equivalent trade and export compliance profiles.

Functional Compatibility: Core ADC functionality is preserved: 8-bit resolution, single-ended input configuration, SPI interface, and SAR architecture. Operating temperature range (-40°C ~ 85°C) is identical. The substitute's enhanced sampling rate (200k vs. 45.5k samples per second) provides performance headroom without introducing functional incompatibility.

Supply Voltage Considerations: The substitute operates within a 2.7V ~ 5.25V range, which overlaps the original 3V ~ 6V specification. System designs operating within the 3V ~ 5.25V window require no modification. Designs utilizing the 5.25V ~ 6V upper range of the original part require voltage adjustment or alternative component selection.

Reference Architecture Difference: The TLC548ID employs external reference architecture, while the ADC081S021CIMF/NOPB uses supply-based reference. This difference requires circuit redesign in the reference network but does not preclude substitution in applications where supply-referenced conversion is acceptable.

Package Transition: The substitute uses SOT-23-6 packaging versus the original 8-SOIC form factor. PCB layout modification is required. The SOT-23-6 package offers reduced footprint, which may provide design benefits in space-constrained applications.

Frequently Asked Questions (FAQ)

Q: Can the ADC081S021CIMF/NOPB directly replace the TLC548ID without circuit modifications?

A: Direct pin-for-pin replacement is not possible due to different package types (8-SOIC vs. SOT-23-6). Additionally, the reference architecture differs (external vs. supply-based), requiring modification of the reference network circuit. PCB layout redesign is necessary.

Q: What is the impact of the different reference types on circuit design?

A: The TLC548ID requires an external reference voltage source, while the ADC081S021CIMF/NOPB derives its reference from the supply voltage. Applications using the substitute must eliminate external reference circuitry and ensure supply voltage stability meets ADC reference accuracy requirements.

Q: Are there supply voltage compatibility issues between these components?

A: The substitute's operating range (2.7V ~ 5.25V) overlaps the original specification (3V ~ 6V) from 3V to 5.25V. Systems operating above 5.25V require alternative components or voltage regulation modifications.

Q: How does the increased sampling rate of the substitute affect system design?

A: The ADC081S021CIMF/NOPB's 200k samples per second exceeds the original 45.5k specification. This enhancement provides faster conversion capability and is backward compatible with applications designed for the slower original part. No system modifications are required to accommodate the higher sampling rate.

Q: What are the compliance and regulatory implications of this substitution?

A: Both components maintain identical ROHS3 compliance, REACH status, ECCN classification, and HTSUS codes. Regulatory and environmental compliance profiles are equivalent, eliminating compliance-related barriers to substitution.

Q: Is the SOT-23-6 package suitable for high-volume production?

A: SOT-23-6 is a standard surface mount package widely supported by automated assembly equipment. Production transition is feasible with standard PCB design and assembly processes. Package selection should be validated against specific manufacturing capabilities and thermal requirements.