TLC548IDR Equivalent & Substitute Parts

Part Overview

The TLC548IDR is an 8-bit Analog to Digital Converter (ADC) manufactured by Texas Instruments, housed in an 8-SOIC package. This device features a single-ended input with a 45.5k samples per second sampling rate and operates on 3V to 6V supply voltage for both analog and digital domains. The TLC548IDR is classified as obsolete, making identification of functionally compatible alternatives essential for ongoing system support and new design implementations.

Substiute Parts

TLC548IDR

Texas InstrumentsIn Stock: 5279TLC548IDR Datasheet

Current PartRFQ

ADC081S021CIMFX/NOPB

Texas InstrumentsIn Stock: 744ADC081S021CIMFX/NOPB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the TLC548IDR is determined by the following critical parameters:

• Resolution: 8-bit conversion capability
• Sampling Rate: Minimum 45.5k samples per second
• Input Configuration: Single-ended input channel
• Data Interface: SPI protocol support
• Architecture: SAR (Successive Approximation Register) topology
• Supply Voltage Compatibility: Operating range that encompasses or exceeds 3V to 6V
• Operating Temperature Range: -40°C to 85°C
• Package Type: Surface mount configuration

The ADC081S021CIMFX/NOPB meets these substitution criteria while offering enhanced specifications in sampling rate and supply voltage flexibility.

Parameter Comparison

Engineering Selection Recommendations

The ADC081S021CIMFX/NOPB is the manufacturer-recommended substitute for the obsolete TLC548IDR. Both devices maintain identical 8-bit resolution, single-ended input configuration, and SAR architecture. The substitute part offers superior sampling rate performance at 200k samples per second compared to the original 45.5k samples per second, providing enhanced conversion speed for applications requiring faster data acquisition.

Both parts maintain full compliance with ROHS3 and REACH regulations, with identical moisture sensitivity ratings. The substitute operates across a slightly wider supply voltage range (2.7V to 5.25V) compared to the original specification (3V to 6V), ensuring compatibility in most existing designs. Operating temperature ranges remain identical at -40°C to 85°C.

The primary design consideration is package transition from 8-SOIC to SOT-23-6, which requires PCB layout modification. The substitute part is currently in active production status, ensuring long-term availability and supply chain stability.

Frequently Asked Questions (FAQ)

Q: Can the ADC081S021CIMFX/NOPB directly replace the TLC548IDR without circuit modifications?

A: Functional substitution is possible due to matching resolution, input configuration, and data interface. However, package geometry differs (8-SOIC versus SOT-23-6), requiring PCB layout redesign. Pin-to-pin compatibility must be verified against specific pinout documentation.

Q: What is the impact of the higher sampling rate in the substitute part?

A: The ADC081S021CIMFX/NOPB operates at 200k samples per second versus 45.5k samples per second in the original. This enhancement provides faster conversion capability and is backward-compatible with applications designed for the slower rate.

Q: Are there supply voltage compatibility concerns?

A: The substitute operates at 2.7V to 5.25V, while the original specifies 3V to 6V. The overlap range (3V to 5.25V) ensures compatibility for most applications. Designs operating above 5.25V or below 3V require evaluation against the substitute's specifications.

Q: What is the significance of the reference type difference?

A: The TLC548IDR uses an external reference, while the ADC081S021CIMFX/NOPB uses supply-referenced conversion. This difference affects circuit design and may require modifications to reference circuitry in the application.

Q: Does the substitute support the same data interface protocols?

A: Both parts support SPI protocol. The substitute additionally supports DSP interface, providing expanded communication options without compromising SPI compatibility.