TLC548CDR Equivalent & Substitute Parts

Part Overview

The TLC548CDR is an 8-bit Analog to Digital Converter (ADC) manufactured by Texas Instruments, designed for single-ended input applications with a 1:1 Sample-and-Hold to ADC ratio. The device features a SAR (Successive Approximation Register) architecture and operates with external voltage references across a 3V to 6V supply range. The TLC548CDR is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements.

Substiute Parts

TLC548CDR

Texas InstrumentsIn Stock: 2020TLC548CDR Datasheet

Current PartRFQ

ADC081S021CIMFX/NOPB

Texas InstrumentsIn Stock: 744ADC081S021CIMFX/NOPB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the TLC548CDR is determined by the following critical parameters:

• Resolution: 8-bit ADC architecture
• Input Configuration: Single-ended input with 1 channel
• Conversion Method: SAR (Successive Approximation Register)
• Data Interface: SPI protocol compatibility
• Supply Voltage Range: Compatibility with 3V to 6V operation
• Package Type: Surface mount form factor
• Reference Architecture: External or supply-based voltage reference capability

The ADC081S021CIMFX/NOPB qualifies as a direct substitute based on matching 8-bit resolution, single-ended input, SAR architecture, and SPI interface. While the substitute offers enhanced specifications (higher sampling rate, wider supply voltage range, extended temperature range), it maintains functional compatibility with the TLC548CDR's core application requirements.

Parameter Comparison

Engineering Selection Recommendations

The ADC081S021CIMFX/NOPB is the recommended substitute for the obsolete TLC548CDR. Both devices are manufactured by Texas Instruments and maintain ROHS3 compliance. The substitute is currently in active production status, ensuring long-term availability and supply chain stability.

Key considerations for selection:

• Package Transition: Migration from 8-SOIC to SOT-23-6 requires PCB layout redesign. Pin configuration must be verified against application schematics.
• Supply Voltage Overlap: The substitute operates within the TLC548CDR's 3V to 6V range, with extended lower voltage capability (2.7V minimum).
• Performance Enhancement: The ADC081S021CIMFX/NOPB provides 4.4x higher sampling rate (200k vs 45.5k samples per second), suitable for applications requiring faster conversion rates.
• Temperature Range: Extended operating temperature (-40°C to 85°C) provides broader environmental compatibility compared to the original device (0°C to 70°C).
• Reference Architecture: The substitute uses supply-based voltage reference, differing from the TLC548CDR's external reference requirement. Application circuits must accommodate this architectural change.

Frequently Asked Questions (FAQ)

Q: Can the ADC081S021CIMFX/NOPB directly replace the TLC548CDR without circuit modifications?

A: Functional substitution is possible due to matching 8-bit resolution, single-ended input, SAR architecture, and SPI interface. However, package differences (8-SOIC vs SOT-23-6) and reference architecture changes (external vs supply-based) require PCB redesign and circuit evaluation.

Q: What is the primary reason for substituting the TLC548CDR?

A: The TLC548CDR is classified as obsolete. The ADC081S021CIMFX/NOPB is an active product with guaranteed long-term availability and supply chain support.

Q: Are there pin-to-pin compatibility considerations?

A: No. The TLC548CDR uses 8-SOIC packaging while the ADC081S021CIMFX/NOPB uses SOT-23-6 packaging. Pin counts and assignments differ, requiring complete PCB layout revision.

Q: How does the sampling rate difference affect application performance?

A: The ADC081S021CIMFX/NOPB operates at 200k samples per second versus the TLC548CDR's 45.5k samples per second. Applications with slower conversion requirements remain compatible; higher-speed applications benefit from improved performance.

Q: What voltage reference configuration changes are required?

A: The TLC548CDR requires an external voltage reference. The ADC081S021CIMFX/NOPB uses the supply voltage as reference. Circuit design must be modified to accommodate this architectural difference.

Q: Are both devices RoHS compliant?

A: Yes. Both the TLC548CDR and ADC081S021CIMFX/NOPB are ROHS3 compliant, meeting environmental and regulatory requirements.