TLV1548CDB Equivalent & Substitute Parts

Part Overview

The TLV1548CDB is a 10-bit Analog to Digital Converter (ADC) manufactured by Texas Instruments, designed for data acquisition applications requiring 8 single-ended analog inputs with SPI digital interface. This device operates across a wide supply voltage range of 2.7V to 5.5V for both analog and digital domains, making it suitable for battery-powered and industrial applications. 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 long-term component availability for new production runs and system upgrades.

Substiute Parts

TLV1548CDB

Texas InstrumentsIn Stock: 879TLV1548CDB Datasheet

Current PartRFQ

ADS7038IRTER

Texas InstrumentsIn Stock: 12251ADS7038IRTER Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the TLV1548CDB is evaluated based on the following critical parameters that define functional compatibility:

Core Functional Parameters:

• Number of analog inputs (8 channels required)
• Input type (single-ended configuration)
• Data interface protocol (SPI compatibility)
• SAR architecture (successive approximation register ADC)
• Supply voltage ranges (analog and digital domains)

Allowed Substitution Criteria: The ADS7038IRTER qualifies as a manufacturer-recommended substitute despite differences in resolution (12-bit vs. 10-bit) and sampling rate (1 MSPS vs. 87 kSPS) because it maintains the same core functional architecture, identical number of single-ended inputs, SPI interface compatibility, and overlapping supply voltage specifications. The enhanced resolution and sampling rate represent functional improvements rather than incompatibilities. Both devices are manufactured by Texas Instruments and comply with identical regulatory standards (ROHS3, REACH Unaffected, EAR99).

Parameter Comparison

Engineering Selection Recommendations

The ADS7038IRTER is designated as the manufacturer-recommended substitute for the TLV1548CDB. Selection of this substitute is supported by the following engineering factors:

Product Status: The TLV1548CDB is in Last Time Buy status, indicating imminent discontinuation. The ADS7038IRTER maintains Active product status, ensuring long-term availability and continued manufacturer support.

Regulatory Compliance: Both devices maintain identical compliance certifications (ROHS3 Compliant, REACH Unaffected, EAR99 classification), ensuring no regulatory barriers to substitution in existing applications.

Functional Compatibility: Both devices provide 8-channel single-ended analog input acquisition with SPI digital interface and SAR architecture. The ADS7038IRTER offers enhanced specifications (12-bit resolution, 1 MSPS sampling rate, extended operating temperature range of -40°C to 125°C) that provide functional improvements over the original device.

Package Consideration: The ADS7038IRTER uses a 16-WQFN (3x3) package versus the TLV1548CDB's 20-SSOP package. PCB layout modifications are required to accommodate the different package footprint and pin configuration.

Frequently Asked Questions (FAQ)

Q: Can the ADS7038IRTER directly replace the TLV1548CDB without firmware changes?

A: The ADS7038IRTER maintains SPI interface compatibility and identical 8-channel single-ended input architecture. However, the different package (16-WQFN vs. 20-SSOP) requires PCB redesign. Pin mapping must be verified against both datasheets to ensure correct signal routing. The enhanced 12-bit resolution may require software adjustments to process the increased data width.

Q: What are the key differences in supply voltage specifications?

A: The TLV1548CDB requires 2.7V minimum for both analog and digital supplies. The ADS7038IRTER accepts lower digital supply voltages (1.65V minimum) and slightly lower analog supply voltages (2.35V minimum). Both devices support the same 5.5V maximum. Existing power supply designs operating at 2.7V or higher remain compatible with the substitute.

Q: Does the ADS7038IRTER support the same sampling rate as the TLV1548CDB?

A: No. The TLV1548CDB operates at 87 kSPS, while the ADS7038IRTER operates at 1 MSPS. The substitute provides significantly higher sampling capability, which is a functional improvement. Applications requiring the original 87 kSPS rate can operate the ADS7038IRTER at reduced sampling rates through firmware configuration.

Q: Are there temperature range considerations for substitution?

A: The TLV1548CDB operates from 0°C to 70°C, while the ADS7038IRTER operates from -40°C to 125°C. The substitute provides an extended operating range suitable for industrial and automotive applications. Existing designs operating within 0°C to 70°C remain fully compatible.

Q: What package-related design changes are necessary?

A: The ADS7038IRTER uses a 16-pin WQFN (3x3) package with an exposed pad, compared to the TLV1548CDB's 20-pin SSOP package. PCB footprint, via placement, and thermal management design must be updated. Pin assignments differ between the two devices and must be verified against respective datasheets before layout implementation.

Q: Is the ADS7038IRTER suitable for battery-powered applications?

A: Yes. The ADS7038IRTER supports the same 2.7V to 5.5V analog supply range as the original device and offers lower minimum digital supply voltage (1.65V), providing additional flexibility for low-power designs. The extended operating temperature range also benefits battery-powered systems operating in variable environmental conditions.