TLC3548IPWR Equivalent & Substitute Parts

Part Overview

The TLC3548IPWR is a 14-bit Analog to Digital Converter (ADC) manufactured by Texas Instruments, designed for data acquisition applications requiring multi-channel input processing. This device features a Successive Approximation Register (SAR) architecture with configurable input channels (4 or 8) and operates across industrial temperature ranges. The product is currently in Last Time Buy status, indicating end-of-life phase. Identifying equivalent and substitute parts is necessary to ensure design continuity and maintain supply chain reliability for ongoing production and maintenance requirements.

Substiute Parts

TLC3548IPWR

Texas InstrumentsIn Stock: 1500TLC3548IPWR Datasheet

Current PartRFQ

ADS7951SDBTR

Texas InstrumentsIn Stock: 8146ADS7951SDBTR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the TLC3548IPWR are identified based on functional compatibility within the data acquisition category. The primary substitute, ADS7951SDBTR, shares the following critical parameters that enable substitution:

• Architecture: Both devices employ SAR (Successive Approximation Register) topology
• Data Interface: Both utilize SPI communication protocol
• Configuration: Both feature MUX-S/H-ADC configuration with 1:1 S/H:ADC ratio
• Single A/D Converter: Both contain one integrated ADC core
• Reference Type: Both support external reference configuration
• Mounting Type: Both are surface-mount devices
• Compliance: Both meet ROHS3 and REACH requirements
• MSL Rating: Both carry MSL 2 (1 Year) classification

Substitution is constrained by differences in resolution (14-bit vs. 12-bit), sampling rate (200 kSPS vs. 1 MHz), input channel configuration (4/8 vs. 8 only), and package form factor (24-TSSOP vs. 30-TSSOP). These differences must be evaluated against specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

The ADS7951SDBTR is available as an active product from Texas Instruments, providing supply continuity for applications transitioning from the end-of-life TLC3548IPWR. Both devices maintain equivalent compliance certifications (ROHS3, REACH Unaffected) and identical MSL ratings, ensuring equivalent reliability and handling requirements.

Selection of ADS7951SDBTR requires evaluation of the following design impacts:

• Resolution Trade-off: The ADS7951SDBTR provides 12-bit resolution versus the TLC3548IPWR's 14-bit resolution. Applications requiring 14-bit precision must assess whether 12-bit output meets functional specifications.
• Sampling Rate Increase: The ADS7951SDBTR operates at 1 MHz sampling rate, providing 5x faster conversion than the TLC3548IPWR's 200 kSPS. This increased speed may require firmware adjustment for data handling.
• Input Channel Configuration: The ADS7951SDBTR is fixed at 8 input channels, whereas the TLC3548IPWR offers 4 or 8 channel variants. Applications using 4-channel configuration must accommodate the additional channels.
• Input Type Limitation: The ADS7951SDBTR supports single-ended inputs only, eliminating pseudo-differential input capability present in the TLC3548IPWR.
• Package Footprint Change: The 30-TFSOP package of ADS7951SDBTR differs from the 24-TSSOP package of TLC3548IPWR, requiring PCB layout modification.
• Temperature Range Extension: The ADS7951SDBTR extends operating temperature to 125°C, providing broader environmental compatibility.

Frequently Asked Questions (FAQ)

Q: Can the ADS7951SDBTR directly replace the TLC3548IPWR without firmware changes?

A: Direct replacement requires firmware evaluation. Both devices use SPI interface and SAR architecture, but the ADS7951SDBTR's 12-bit resolution and 1 MHz sampling rate differ from the TLC3548IPWR's 14-bit resolution and 200 kSPS rate. Data format and timing adjustments may be necessary.

Q: What is the impact of the package change from 24-TSSOP to 30-TFSOP?

A: The package change requires PCB layout redesign. The 30-TFSOP package has a larger pin count and different footprint dimensions than the 24-TSSOP. Physical board space and routing must be re-evaluated.

Q: Does the ADS7951SDBTR support pseudo-differential inputs like the TLC3548IPWR?

A: No. The ADS7951SDBTR supports single-ended inputs only. Applications requiring pseudo-differential input capability cannot use this substitute without additional external signal conditioning.

Q: Are there supply chain advantages to using the ADS7951SDBTR?

A: Yes. The ADS7951SDBTR maintains active product status with Texas Instruments, ensuring ongoing availability and support. The TLC3548IPWR is in Last Time Buy phase, limiting future procurement options.

Q: How do the reference voltage options differ between these devices?

A: The TLC3548IPWR supports both external and internal reference configurations. The ADS7951SDBTR supports external reference only. Applications relying on internal reference functionality must implement external reference circuitry.

Q: What are the MSL and moisture handling considerations for both devices?

A: Both devices carry MSL 2 (1 Year) classification, indicating identical moisture sensitivity and handling requirements. Standard moisture control procedures apply to both components during storage and assembly.