TLC1542CDW Equivalent & Substitute Parts

Part Overview

The TLC1542CDW is a 10-bit Analog to Digital Converter (ADC) manufactured by Texas Instruments, configured as a SAR (Successive Approximation Register) architecture with 11 single-ended inputs and SPI data interface. The device operates at a 38 kHz sampling rate with external voltage reference capability and is packaged in a 20-SOIC surface mount package.

The TLC1542CDW is designated as Last Time Buy, indicating limited future availability. Identifying equivalent and substitute parts is necessary to ensure design continuity and support long-term production requirements.

Substiute Parts

TLC1542CDW

Texas InstrumentsIn Stock: 1918TLC1542CDW Datasheet

Current PartRFQ

ADS7956SDBTR

Texas InstrumentsIn Stock: 1809ADS7956SDBTR Datasheet

MFR RecommendedRFQ

TLC1543CDW

Texas InstrumentsIn Stock: 1828TLC1543CDW Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the TLC1542CDW is evaluated based on the following critical parameters:

• Resolution: 10-bit ADC capability
• Architecture: SAR-based conversion
• Data Interface: SPI protocol compatibility
• Input Configuration: Single-ended input structure
• Package Compatibility: Surface mount form factor
• Supply Voltage: Analog and digital supply requirements

Two substitute parts meet these criteria with varying degrees of parametric alignment:

TLC1543CDW — Parametric equivalent with identical electrical specifications and package format. Differs only in product status (Obsolete).

ADS7956SDBTR — Functional equivalent with enhanced specifications. Provides 12 inputs (vs. 11), higher sampling rate (1 MHz vs. 38 kHz), wider supply voltage range, and extended operating temperature. Packaged in 38-TSSOP format.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Same Package, Identical Specifications): TLC1543CDW provides parametric equivalence to the TLC1542CDW with identical electrical characteristics and 20-SOIC packaging. However, TLC1543CDW is designated Obsolete, presenting the same long-term availability constraints as the primary part.

For Active Production (Enhanced Specifications): ADS7956SDBTR is the only active product among the three options. It maintains 10-bit SAR architecture and SPI interface compatibility while offering enhanced performance specifications: 1 MHz sampling rate, 12 input channels, extended supply voltage range (2.7V to 5.25V analog, 1.7V to 5.25V digital), and wider operating temperature range (-40°C to 125°C). The 38-TSSOP package requires PCB layout modification compared to the 20-SOIC footprint.

All three parts are ROHS3 compliant and carry identical ECCN and HTSUS classifications.

Frequently Asked Questions (FAQ)

Q: Can TLC1543CDW be used as a direct replacement for TLC1542CDW? A: Yes. TLC1543CDW is a parametric equivalent with identical resolution, input count, sampling rate, supply voltages, operating temperature range, and 20-SOIC package. However, both parts share Last Time Buy or Obsolete status, so this substitution does not resolve long-term availability concerns.

Q: What are the key differences between TLC1542CDW and ADS7956SDBTR? A: Both devices are 10-bit SAR ADCs with SPI interface and single-ended inputs. ADS7956SDBTR provides one additional input channel (12 vs. 11), significantly higher sampling rate (1 MHz vs. 38 kHz), wider supply voltage tolerance, and extended operating temperature range. The primary trade-off is package format: ADS7956SDBTR uses 38-TSSOP instead of 20-SOIC, requiring PCB redesign.

Q: Is ADS7956SDBTR compatible with existing TLC1542CDW designs? A: Electrical compatibility is maintained for SPI protocol and 10-bit resolution. However, the different package footprint (38-TSSOP vs. 20-SOIC) requires PCB layout modification. The enhanced specifications (higher sampling rate, wider voltage range, extended temperature range) are backward compatible with designs that do not require these features.

Q: Which substitute part should be selected for new designs? A: ADS7956SDBTR is the recommended choice for new designs due to its Active product status, ensuring long-term availability and manufacturing support. The enhanced specifications provide design flexibility for future requirements.

Q: Are all three parts RoHS compliant? A: Yes. TLC1542CDW, TLC1543CDW, and ADS7956SDBTR are all ROHS3 compliant with identical REACH and ECCN classifications.