TLC3544IPW Equivalent & Substitute Parts

Part Overview

The TLC3544IPW is a 14-bit Analog to Digital Converter (ADC) manufactured by Texas Instruments, designed for data acquisition applications requiring moderate resolution and sampling rates. This device features a Successive Approximation Register (SAR) architecture with 2 or 4 pseudo-differential and single-ended input channels, operating from a 5V analog supply and 2.7V to 5.5V digital supply. The TLC3544IPW is classified as Last Time Buy, indicating end-of-life status. Identifying equivalent substitute parts is necessary for design continuity, long-term product support, and ensuring availability for new production runs or design revisions.

Substiute Parts

TLC3544IPW

Texas InstrumentsIn Stock: 1917TLC3544IPW Datasheet

Current PartRFQ

ADS7950SDBTR

Texas InstrumentsIn Stock: 1331ADS7950SDBTR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The ADS7950SDBTR is identified as a manufacturer-recommended substitute for the TLC3544IPW. Substitution eligibility is determined by the following criteria:

Common Functional Parameters:

• Architecture: Both devices use SAR (Successive Approximation Register) topology
• Data Interface: Both support SPI communication protocol
• Configuration: Both feature MUX-S/H-ADC with 1:1 S/H:ADC ratio
• Number of A/D Converters: Both contain 1 ADC core
• Mounting Type: Both are surface-mount devices
• Compliance: Both are ROHS3 compliant and REACH unaffected

Allowable Variations:

• Resolution: ADS7950SDBTR provides 12-bit resolution versus 14-bit on TLC3544IPW
• Sampling Rate: ADS7950SDBTR operates at 1 MSPS versus 200 kSPS on TLC3544IPW
• Input Channels: ADS7950SDBTR provides 4 single-ended inputs versus 2/4 pseudo-differential and single-ended on TLC3544IPW
• Supply Voltage: ADS7950SDBTR supports 2.7V ~ 5.25V analog and 1.7V ~ 5.25V digital versus 5V analog and 2.7V ~ 5.5V digital on TLC3544IPW
• Operating Temperature: ADS7950SDBTR extends to -40°C ~ 125°C versus -40°C ~ 85°C on TLC3544IPW
• Package: ADS7950SDBTR uses 30-TFSOP versus 20-TSSOP on TLC3544IPW

Parameter Comparison

Engineering Selection Recommendations

The ADS7950SDBTR is an active product from Texas Instruments and represents a viable substitute path for the end-of-life TLC3544IPW. Both devices maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory continuity.

Selection of the ADS7950SDBTR requires design evaluation of the following trade-offs:

• The ADS7950SDBTR provides lower resolution (12-bit versus 14-bit), which may impact applications requiring higher precision
• The ADS7950SDBTR offers higher sampling rate (1 MSPS versus 200 kSPS), providing increased throughput capability
• The ADS7950SDBTR supports only single-ended inputs, eliminating pseudo-differential input capability
• The ADS7950SDBTR requires a larger package footprint (30-TFSOP versus 20-TSSOP), affecting PCB layout
• The ADS7950SDBTR extends operating temperature range to 125°C, providing broader environmental coverage
• The ADS7950SDBTR supports lower minimum supply voltages (1.7V digital), enabling low-power applications

The ADS7950SDBTR is recommended for new designs where resolution requirements do not exceed 12 bits and single-ended input configuration is acceptable.

Frequently Asked Questions (FAQ)

Q: Can the ADS7950SDBTR directly replace the TLC3544IPW without PCB modifications?

A: No. The ADS7950SDBTR uses a 30-pin TFSOP package versus the 20-pin TSSOP package of the TLC3544IPW. PCB layout and footprint redesign is required. Pin-to-pin compatibility does not exist between these packages.

Q: What is the impact of the 2-bit resolution difference between these devices?

A: The TLC3544IPW provides 14-bit resolution (16,384 discrete levels), while the ADS7950SDBTR provides 12-bit resolution (4,096 discrete levels). Applications requiring quantization levels finer than 1 part in 4,096 cannot use the ADS7950SDBTR as a substitute.

Q: Does the ADS7950SDBTR support pseudo-differential inputs like the TLC3544IPW?

A: No. The ADS7950SDBTR supports only single-ended input configuration. Applications requiring pseudo-differential input capability must retain the TLC3544IPW or identify alternative devices with this feature.

Q: Is the higher sampling rate of the ADS7950SDBTR (1 MSPS) a compatibility concern?

A: No. Higher sampling rate is a performance enhancement and does not create incompatibility. Applications using the TLC3544IPW at 200 kSPS can operate the ADS7950SDBTR at reduced sampling rates through firmware configuration.

Q: What supply voltage considerations apply when substituting the ADS7950SDBTR?

A: The ADS7950SDBTR supports 1.7V to 5.25V digital supply and 2.7V to 5.25V analog supply. The TLC3544IPW requires 5V analog supply. Designs using 5V analog supply are compatible with the ADS7950SDBTR. Designs using lower analog voltages may require the ADS7950SDBTR.

Q: Are both devices suitable for extended temperature applications?

A: The ADS7950SDBTR supports -40°C to 125°C, exceeding the TLC3544IPW range of -40°C to 85°C. For applications requiring operation above 85°C, the ADS7950SDBTR provides extended temperature coverage.