TLC549CDG4 Equivalent & Substitute Parts

Part Overview

The TLC549CDG4 is an 8-bit Analog to Digital Converter (ADC) manufactured by Texas Instruments, featuring a single-ended input, SAR architecture, and SPI data interface. This device is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The part operates with external voltage reference and supports supply voltages between 3V and 6V across both analog and digital domains.

Substiute Parts

TLC549CDG4

Texas InstrumentsIn Stock: 1060TLC549CDG4 Datasheet

Current PartRFQ

ADC081S021CIMF/NOPB

Texas InstrumentsIn Stock: 25912ADC081S021CIMF/NOPB Datasheet

MFR RecommendedRFQ

MCP3001-I/SN

Microchip TechnologyIn Stock: 3040MCP3001-I/SN Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the TLC549CDG4 is determined by the following critical parameters:

Core Functional Requirements:

• 8-bit resolution minimum (higher resolution acceptable)
• Single-ended or pseudo-differential input capability
• SAR architecture
• SPI data interface support
• External or supply voltage reference capability

Electrical Compatibility:

• Supply voltage range overlap with 3V ~ 6V requirement
• Single analog input channel
• Sampling rate of 40k SPS or higher

Physical & Environmental Constraints:

• Surface mount packaging
• Operating temperature range compatibility
• RoHS3 compliance

Two substitute parts meet these criteria with varying trade-offs in resolution, sampling rate, packaging, and reference architecture.

Parameter Comparison

Engineering Selection Recommendations

ADC081S021CIMF/NOPB is the primary substitute for direct replacement in applications where the original 8-bit resolution and SPI interface are required. This part maintains Texas Instruments manufacturing continuity and offers improved specifications: 5x higher sampling rate (200k SPS), extended operating temperature range (-40°C to 85°C), and active product status ensuring long-term availability. The supply-referenced voltage architecture eliminates the need for external reference circuitry. Package transition from 8-SOIC to SOT-23-6 requires PCB layout modification. This substitute is suitable for applications with standard industrial temperature requirements.

MCP3001-I/SN provides an alternative with enhanced resolution (10-bit) and maintains the 8-SOIC package footprint, minimizing PCB redesign. This Microchip Technology device supports pseudo-differential input measurement and external voltage reference configuration, matching the original reference architecture. The 200k SPS sampling rate exceeds original specifications. This substitute is appropriate for applications requiring higher measurement precision or pseudo-differential input capability while maintaining package compatibility.

Both substitutes are ROHS3 compliant and carry active product status, ensuring regulatory compliance and supply chain stability.

Frequently Asked Questions (FAQ)

Q: Can ADC081S021CIMF/NOPB directly replace TLC549CDG4 without circuit modifications?

A: Functional replacement is possible with circuit modifications. The ADC081S021CIMF/NOPB eliminates the external reference requirement due to its supply-referenced architecture, simplifying the analog front-end. However, the SOT-23-6 package requires PCB layout changes compared to the 8-SOIC footprint. SPI interface compatibility is maintained.

Q: What is the key difference between the two substitute parts?

A: ADC081S021CIMF/NOPB maintains 8-bit resolution with supply-referenced voltage, while MCP3001-I/SN provides 10-bit resolution with external reference capability and pseudo-differential input support. Package differs: ADC081S021CIMF/NOPB uses SOT-23-6; MCP3001-I/SN uses 8-SOIC.

Q: Is the MCP3001-I/SN compatible with the original 8-SOIC package footprint?

A: Yes. The MCP3001-I/SN uses the same 8-SOIC (0.154", 3.90mm Width) package as the TLC549CDG4, allowing direct PCB footprint compatibility without layout redesign.

Q: Do both substitutes support the original 3V ~ 6V supply voltage range?

A: Both substitutes operate within overlapping voltage ranges. ADC081S021CIMF/NOPB operates 2.7V ~ 5.25V; MCP3001-I/SN operates 2.7V ~ 5.5V. The upper limit of 5.25V and 5.5V respectively is below the original 6V maximum. Applications requiring 6V operation require design review.

Q: Which substitute is recommended for new designs?

A: Selection depends on application requirements. For direct 8-bit replacement with simplified reference circuitry, ADC081S021CIMF/NOPB is appropriate. For applications requiring higher resolution or pseudo-differential measurement with package compatibility, MCP3001-I/SN is suitable. Both are active products with long-term availability.

Q: Are there any temperature range limitations with the substitutes?

A: Both substitutes extend the operating temperature range to -40°C ~ 85°C compared to the original 0°C ~ 70°C. Applications operating below 0°C or above 70°C benefit from this extended range. Applications within the original range are fully compatible.