TLC549IDR Equivalent & Substitute Parts

Part Overview

The TLC549IDR is an 8-bit Analog to Digital Converter (ADC) manufactured by Texas Instruments, designed for single-ended input applications with a 1 SAR architecture and SPI data interface. The device operates with external voltage reference and supports supply voltages between 3V and 6V for both analog and digital domains. The TLC549IDR is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements.

Substiute Parts

TLC549IDR

Texas InstrumentsIn Stock: 1860TLC549IDR Datasheet

Current PartRFQ

ADC081S021CIMFX/NOPB

Texas InstrumentsIn Stock: 744ADC081S021CIMFX/NOPB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the TLC549IDR is determined by the following critical parameters that must be maintained or improved:

Core Functional Parameters:

• Resolution: 8-bit ADC capability
• Input Configuration: Single-ended input
• Architecture: SAR (Successive Approximation Register)
• Data Interface: SPI compatibility
• Operating Temperature Range: -40°C ~ 85°C minimum

Electrical Parameters:

• Supply Voltage Range: Must support the 3V ~ 6V operating window or broader range
• Reference Type: External reference capability
• Number of Inputs: Single input channel

Physical & Compliance Parameters:

• Mounting Type: Surface Mount
• RoHS3 Compliance: Required
• MSL Rating: 1 (Unlimited) or equivalent

The ADC081S021CIMFX/NOPB qualifies as a direct substitute because it maintains 8-bit resolution, single-ended input, SAR architecture, SPI data interface, and operating temperature range. While the substitute offers improved specifications (200k sampling rate vs. 40k, broader supply voltage range 2.7V ~ 5.25V, and active product status), it remains functionally compatible for applications designed around the TLC549IDR.

Parameter Comparison

Engineering Selection Recommendations

The ADC081S021CIMFX/NOPB is the recommended substitute for the obsolete TLC549IDR based on the following engineering criteria:

Product Status & Availability: The TLC549IDR is classified as obsolete, whereas the ADC081S021CIMFX/NOPB maintains active product status with 716 units in stock. This ensures long-term availability and supply chain continuity for new designs and production runs.

Compliance & Certifications: Both devices maintain ROHS3 compliance, MSL 1 (Unlimited) rating, and identical operating temperature ranges (-40°C ~ 85°C). Both are classified under ECCN EAR99 and REACH Unaffected status, ensuring regulatory alignment.

Functional Compatibility: The substitute maintains 8-bit resolution, single-ended input configuration, SAR architecture, and SPI data interface. The ADC081S021CIMFX/NOPB offers enhanced performance with 200k sampling rate compared to the original 40k, providing headroom for demanding applications without compromising backward compatibility.

Electrical Considerations: The substitute operates within a broader supply voltage range (2.7V ~ 5.25V) compared to the original (3V ~ 6V). Applications operating at 3V ~ 5.25V will function identically. Applications requiring operation above 5.25V or below 2.7V require alternative solutions.

Package Transition: The substitute uses SOT-23-6 packaging versus the original 8-SOIC. PCB layout modifications are required to accommodate the different footprint and pin configuration.

Frequently Asked Questions (FAQ)

Q: Can the ADC081S021CIMFX/NOPB directly replace the TLC549IDR without design changes?

A: The ADC081S021CIMFX/NOPB provides functional equivalence in resolution, input type, architecture, and data interface. However, the package change from 8-SOIC to SOT-23-6 requires PCB layout modifications and pin reassignment. Verify supply voltage requirements fall within the 2.7V ~ 5.25V range of the substitute.

Q: What are the key differences between these two devices?

A: The primary differences are product status (obsolete vs. active), sampling rate (40k vs. 200k), supply voltage range (3V ~ 6V vs. 2.7V ~ 5.25V), package type (8-SOIC vs. SOT-23-6), and reference type (external vs. supply). Functionally, both are 8-bit single-ended SAR ADCs with SPI interface.

Q: Is the substitute suitable for applications requiring external voltage reference?

A: The ADC081S021CIMFX/NOPB uses supply voltage as reference, whereas the TLC549IDR uses external reference. Applications requiring external reference control must implement alternative solutions or redesign the reference circuit to use supply voltage.

Q: What supply voltage range must be maintained for compatibility?

A: The substitute operates between 2.7V ~ 5.25V. The original device operates between 3V ~ 6V. Applications operating between 3V ~ 5.25V are fully compatible. Applications requiring 5.25V ~ 6V operation require alternative components.

Q: Are there packaging considerations for PCB assembly?

A: Yes. The 8-SOIC package (0.154" width, 3.90mm) differs significantly from SOT-23-6. Footprint, pad spacing, and component height are different. PCB redesign is necessary, and assembly process parameters may require adjustment.

Q: Do both devices maintain the same compliance certifications?

A: Yes. Both devices are ROHS3 compliant, carry MSL 1 (Unlimited) rating, are classified as ECCN EAR99, and are REACH Unaffected. Regulatory compliance is maintained across the substitution.