TLV1544CD Equivalent & Substitute Parts

Part Overview

The TLV1544CD is a 10-bit Analog to Digital Converter (ADC) manufactured by Texas Instruments, designed for data acquisition applications requiring 4 single-ended analog inputs with SPI digital interface. The device operates across a 2.7V to 5.5V supply range and achieves a sampling rate of 87 kSPS using a successive approximation register (SAR) architecture with external voltage reference.

The TLV1544CD is classified as Last Time Buy, indicating end-of-life status. Identifying equivalent substitute parts is necessary to ensure design continuity and maintain component availability for new production runs and system updates.

Substiute Parts

TLV1544CD

Texas InstrumentsIn Stock: 2287TLV1544CD Datasheet

Current PartRFQ

ADC104S021CIMMX/NOPB

Texas InstrumentsIn Stock: 4399ADC104S021CIMMX/NOPB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the TLV1544CD is determined by the following core electrical and mechanical parameters:

Critical Matching Parameters:

• Resolution: 10-bit ADC
• Number of Inputs: 4 single-ended channels
• Digital Interface: SPI protocol support
• Architecture: SAR-based conversion
• Supply Voltage Compatibility: Overlapping analog and digital supply ranges
• Mounting Type: Surface mount package

Acceptable Variation Parameters:

• Sampling Rate: Higher rates are acceptable (backward compatible in timing-non-critical applications)
• Operating Temperature Range: Extended ranges are acceptable
• Reference Type: Supply-referenced designs are acceptable if external reference capability is not required
• Package Form Factor: Different surface mount packages acceptable if pin-compatible or redesign feasible

The ADC104S021CIMMX/NOPB qualifies as a substitute based on matching all critical parameters while offering enhanced performance characteristics.

Parameter Comparison

Engineering Selection Recommendations

The ADC104S021CIMMX/NOPB is qualified as a direct substitute for the TLV1544CD based on the following engineering criteria:

Functional Equivalence: Both devices provide 10-bit SAR ADC conversion with 4 single-ended input channels and SPI digital interface, meeting the core functional requirements of the TLV1544CD.

Supply Voltage Compatibility: The overlapping supply voltage ranges (2.7V minimum common to both devices) ensure operation in existing power distribution architectures. The ADC104S021CIMMX/NOPB operates to 5.25V maximum versus 5.5V for the TLV1544CD; designs operating below 5.25V experience no constraint.

Product Status Advantage: The ADC104S021CIMMX/NOPB maintains Active production status, ensuring long-term component availability and supply chain stability compared to the Last Time Buy status of the TLV1544CD.

Compliance Certification: Both devices are ROHS3 compliant. The ADC104S021CIMMX/NOPB carries AEC-Q100 automotive qualification, providing additional reliability assurance for applications requiring automotive-grade components.

Performance Enhancement: The ADC104S021CIMMX/NOPB delivers 200 kSPS sampling rate versus 87 kSPS, providing performance margin for timing-sensitive applications without functional degradation.

Design Considerations: Package transition from 16-SOIC to 10-VSSOP requires PCB layout redesign. Reference voltage architecture differs (external versus supply-referenced); designs utilizing external reference capability must implement supply-referenced operation or add external reference circuitry.

Frequently Asked Questions (FAQ)

Q: Can the ADC104S021CIMMX/NOPB directly replace the TLV1544CD without PCB modification?

A: No. The TLV1544CD uses 16-SOIC packaging while the ADC104S021CIMMX/NOPB uses 10-VSSOP packaging. PCB layout redesign is required. Pin assignments differ between packages and must be verified against device datasheets before implementation.

Q: What is the impact of the different reference voltage architecture?

A: The TLV1544CD requires an external reference voltage source connected to the VREF pin. The ADC104S021CIMMX/NOPB uses the supply voltage as reference. Designs currently using external reference must either eliminate the external reference circuit or implement a supply-referenced design. Accuracy specifications may differ based on supply voltage stability.

Q: Is the higher sampling rate of the ADC104S021CIMMX/NOPB (200 kSPS vs. 87 kSPS) a concern?

A: No. Higher sampling rate is a performance enhancement and does not create compatibility issues. Existing firmware and signal processing algorithms operate without modification. The faster conversion rate provides additional timing margin for applications.

Q: Are there supply voltage constraints when substituting?

A: Yes. The ADC104S021CIMMX/NOPB maximum supply voltage is 5.25V compared to 5.5V for the TLV1544CD. Designs operating at or above 5.25V must verify actual supply voltage does not exceed this limit. Designs operating below 5.25V experience no constraint.

Q: What is the significance of the automotive qualification on the ADC104S021CIMMX/NOPB?

A: AEC-Q100 qualification indicates the device meets automotive industry reliability and testing standards. This qualification is beneficial for applications requiring automotive-grade components but is not required for non-automotive applications.

Q: Does the extended operating temperature range of the ADC104S021CIMMX/NOPB (-40°C to 85°C vs. 0°C to 70°C) affect substitution?

A: No. The extended temperature range is a performance enhancement. Designs operating within the original 0°C to 70°C range experience no impact. The substitute device is qualified for a broader temperature envelope.

Q: What firmware or software changes are required for substitution?

A: SPI protocol implementation remains unchanged. No firmware modifications are required for basic ADC operation. If external reference functionality is utilized in the original design, firmware must be updated to operate with supply-referenced conversion or external reference circuitry must be added.