TLC549IDRG4 Equivalent & Substitute Parts

Part Overview

The TLC549IDRG4 is an 8-bit Analog to Digital Converter (ADC) manufactured by Texas Instruments, featuring a single-ended input with SAR (Successive Approximation Register) architecture and SPI data interface. This component is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The part operates across a supply voltage range of 3V to 6V for both analog and digital domains, with a sampling rate of 40k samples per second and external reference voltage configuration.

Substiute Parts

TLC549IDRG4

Texas InstrumentsIn Stock: 13788TLC549IDRG4 Datasheet

Current PartRFQ

ADC081S021CIMFX/NOPB

Texas InstrumentsIn Stock: 744ADC081S021CIMFX/NOPB Datasheet

MFR RecommendedRFQ

MCP3001-I/SN

Microchip TechnologyIn Stock: 3040MCP3001-I/SN Datasheet

MFR RecommendedRFQ

MCP3001T-I/SN

Microchip TechnologyIn Stock: 3394MCP3001T-I/SN Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the TLC549IDRG4 is determined by the following critical parameters: resolution (8-bit), single input channel, SAR architecture, SPI data interface, external reference voltage requirement, and compatible supply voltage ranges. The substitute parts are grouped based on their ability to maintain functional equivalence within these constraints.

Group 1: Direct Functional Equivalents (8-bit, External Reference)

• MCP3001-I/SN and MCP3001T-I/SN maintain 8-bit resolution with external reference configuration and identical package form factor (8-SOIC), ensuring pin-compatible replacement with enhanced sampling rates (200k vs. 40k).

Group 2: Enhanced Alternative (8-bit, Internal Reference)

• ADC081S021CIMFX/NOPB provides 8-bit resolution with SPI interface but uses internal supply reference instead of external reference, operates at higher sampling rate (200k), and uses a smaller SOT-23-6 package requiring board layout modification.

Substitution validity is constrained by: matching bit resolution, maintaining single-input configuration, preserving SPI protocol compatibility, and ensuring operating temperature range overlap (-40°C to 85°C).

Parameter Comparison

Engineering Selection Recommendations

For Pin-Compatible Replacement: MCP3001-I/SN and MCP3001T-I/SN are recommended as direct substitutes when board layout and pinout compatibility are required. Both parts maintain the 8-SOIC package form factor, external reference voltage configuration, and identical operating temperature range. The primary difference between these two is packaging format: MCP3001-I/SN is supplied in tube packaging, while MCP3001T-I/SN is supplied in cut tape and digi-reel format. Both are active products with ROHS3 compliance and unlimited moisture sensitivity rating. The 10-bit resolution of these parts provides enhanced precision compared to the original 8-bit specification, and the 200k sampling rate exceeds the original 40k specification, offering improved performance headroom.

For Space-Constrained Applications: ADC081S021CIMFX/NOPB provides an alternative when board space is limited, utilizing the smaller SOT-23-6 package. This part maintains 8-bit resolution and SPI interface compatibility but requires circuit board redesign due to different pinout and package dimensions. The internal supply reference eliminates the need for external reference circuitry, simplifying the design. This part is an active product with ROHS3 compliance. The higher sampling rate (200k) and extended data interface support (SPI and DSP) provide additional capability.

All substitute parts maintain compliance with ROHS3 and REACH standards, operate within the -40°C to 85°C temperature range, and carry unlimited moisture sensitivity rating (MSL 1).

Frequently Asked Questions (FAQ)

Q: Can MCP3001-I/SN and MCP3001T-I/SN be used as direct pin-for-pin replacements for TLC549IDRG4?

A: Yes, both MCP3001-I/SN and MCP3001T-I/SN are pin-compatible replacements. They share the identical 8-SOIC package form factor and pinout. The primary difference is packaging format: MCP3001-I/SN uses tube packaging while MCP3001T-I/SN uses cut tape and digi-reel format. Both maintain external reference voltage configuration and operate across the same temperature range.

Q: What is the key difference between MCP3001-I/SN and MCP3001T-I/SN?

A: The functional specifications are identical. The difference is in supply packaging: MCP3001-I/SN is supplied in tube format, while MCP3001T-I/SN is supplied in cut tape and digi-reel format. Selection depends on production volume and assembly line requirements.

Q: Why does ADC081S021CIMFX/NOPB use internal reference instead of external reference?

A: The ADC081S021CIMFX/NOPB is designed with an internal supply reference configuration, which simplifies circuit design by eliminating the need for external reference components. This design choice reduces component count and board space requirements.

Q: Can ADC081S021CIMFX/NOPB replace TLC549IDRG4 without board redesign?

A: No. While ADC081S021CIMFX/NOPB maintains 8-bit resolution and SPI interface compatibility, it uses a different package (SOT-23-6 versus 8-SOIC) with different pinout and pin count (6 pins versus 8 pins). Board layout modification is required for this substitution.

Q: Are all substitute parts RoHS compliant?

A: Yes. TLC549IDRG4, MCP3001-I/SN, MCP3001T-I/SN, and ADC081S021CIMFX/NOPB are all ROHS3 compliant with unlimited moisture sensitivity rating (MSL 1).

Q: What is the sampling rate difference between the original part and substitutes?

A: TLC549IDRG4 operates at 40k samples per second. MCP3001-I/SN, MCP3001T-I/SN, and ADC081S021CIMFX/NOPB all operate at 200k samples per second, providing five times higher sampling rate. This enhanced performance is backward compatible with applications designed for the original 40k specification.

Q: Do the substitute parts support the same supply voltage range?

A: The substitute parts support slightly lower minimum voltage: MCP3001 series and ADC081S021CIMFX/NOPB operate from 2.7V minimum versus 3V minimum for TLC549IDRG4. All parts support operation up to 5.25V to 5.5V, which overlaps with the original 3V to 6V range. Verify your specific supply voltage requirements before selection.