TLC548CP Equivalent & Substitute Parts

Part Overview

The TLC548CP is an 8-bit Analog to Digital Converter (ADC) manufactured by Texas Instruments, designed for single-ended input data acquisition applications. It features a Successive Approximation Register (SAR) architecture with SPI interface and operates across 3V to 6V supply voltage ranges. The device is packaged in an 8-PDIP through-hole configuration.

The TLC548CP is classified as obsolete. Finding equivalent and substitute parts is necessary to support legacy system maintenance, design updates, and procurement continuity where original inventory is depleted or unavailable.

Key Parameters

Parameter	Value
Resolution (Bits)	8
Number of Inputs	1
Input Type	Single Ended
Data Interface	SPI
Architecture	SAR
Sampling Rate	45.5 kSPS
Voltage Supply Range (Analog)	3V ~ 6V
Voltage Supply Range (Digital)	3V ~ 6V
Operating Temperature	0°C ~ 70°C
Package Type	8-DIP (Through Hole)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the TLC548CP is determined by the following core electrical and mechanical parameters:

8-bit resolution requirement
Single-ended input configuration
SPI digital interface compatibility
SAR architecture
Supply voltage compatibility within specified ranges
RoHS3 compliance

The ADC081S021CIMF/NOPB qualifies as a direct substitute based on matching resolution, input type, interface protocol, and architecture. While this substitute introduces differences in sampling rate, supply voltage range, operating temperature, and package format, these differences represent functional enhancements rather than incompatibilities. The substitute maintains backward compatibility with the core electrical interface requirements of the TLC548CP.

Parameter Comparison

Parameter	TLC548CP	ADC081S021CIMF/NOPB	Compatibility Notes
Resolution	8 Bit	8 Bit	Identical
Number of Inputs	1	1	Identical
Input Type	Single Ended	Single Ended	Identical
Data Interface	SPI	SPI, DSP	SPI compatible; substitute offers additional DSP interface
Architecture	SAR	SAR	Identical
Sampling Rate	45.5 kSPS	200 kSPS	Substitute offers higher sampling rate
Voltage Supply (Analog)	3V ~ 6V	2.7V ~ 5.25V	Substitute range partially overlaps; lower minimum voltage
Voltage Supply (Digital)	3V ~ 6V	2.7V ~ 5.25V	Substitute range partially overlaps; lower minimum voltage
Operating Temperature	0°C ~ 70°C	-40°C ~ 85°C	Substitute offers extended temperature range
Package Type	8-DIP (Through Hole)	SOT-23-6 (Surface Mount)	Different package; requires PCB redesign
Product Status	Obsolete	Active	Substitute is actively manufactured
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Identical

Engineering Selection Recommendations

The ADC081S021CIMF/NOPB is the manufacturer-recommended substitute for the obsolete TLC548CP. Selection of this substitute is justified on the following grounds:

Both devices maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment
The substitute is actively manufactured by Texas Instruments, providing long-term supply security
Core electrical functionality (8-bit resolution, single-ended input, SPI interface, SAR architecture) is preserved
The substitute operates within the TLC548CP supply voltage range for applications using 3V to 5.25V supplies
Enhanced performance characteristics (higher sampling rate, extended temperature range) provide operational margin

Package format transition from 8-DIP through-hole to SOT-23-6 surface-mount requires PCB redesign. Applications operating at supply voltages above 5.25V or below 2.7V require alternative solutions outside this substitution path.

Frequently Asked Questions (FAQ)

Q: Can the ADC081S021CIMF/NOPB directly replace the TLC548CP without circuit modifications?

A: The ADC081S021CIMF/NOPB provides electrical compatibility for SPI interface and core ADC functionality. However, the package format differs (SOT-23-6 surface-mount versus 8-DIP through-hole), requiring PCB layout redesign. Pin-to-pin correspondence must be verified during integration.

Q: What is the impact of the different supply voltage ranges?

A: The TLC548CP operates at 3V to 6V; the substitute operates at 2.7V to 5.25V. Applications using supply voltages between 5.25V and 6V are not compatible with the substitute without additional voltage regulation. Applications within the 3V to 5.25V range are fully compatible.

Q: Does the higher sampling rate of the substitute affect compatibility?

A: The substitute's 200 kSPS sampling rate exceeds the TLC548CP's 45.5 kSPS specification. This represents a performance enhancement and does not create incompatibility. System firmware and timing logic must accommodate the faster conversion rate.

Q: Are there package-specific considerations for the substitute?

A: The ADC081S021CIMF/NOPB is supplied in Tape & Reel (TR) packaging for surface-mount assembly. Through-hole socket compatibility is not applicable. PCB design must incorporate appropriate surface-mount footprint and soldering processes.

Q: Is the substitute suitable for legacy system repairs?

A: The substitute is suitable for new designs and system upgrades. Legacy system repairs using the original TLC548CP through-hole package may require alternative solutions if PCB modification is not feasible.

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