TLV1508IPWR Equivalent & Substitute Parts

Part Overview

The TLV1508IPWR is a 10-bit Analog to Digital Converter (ADC) manufactured by Texas Instruments, designed for data acquisition applications requiring moderate sampling rates and multiple input channels. This device features 4 single-ended inputs with a 200 kSPS sampling rate and operates across a wide supply voltage range of 2.7V to 5.5V. The part is currently in Last Time Buy status, indicating end-of-life production. Identifying equivalent and substitute components is necessary to ensure design continuity and support long-term product availability for applications currently utilizing this device.

Substiute Parts

TLV1508IPWR

Texas InstrumentsIn Stock: 852TLV1508IPWR Datasheet

Current PartRFQ

ADS7956SDBTR

Texas InstrumentsIn Stock: 1809ADS7956SDBTR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the TLV1508IPWR is determined by the following critical parameters:

• Resolution: 10-bit conversion capability
• Architecture: SAR (Successive Approximation Register) topology
• Data Interface: SPI serial communication protocol
• Input Configuration: Single-ended analog inputs with multiplexer and sample-and-hold functionality
• Supply Voltage Compatibility: Overlapping analog and digital supply ranges
• Package Compatibility: Surface mount form factor with compatible pin pitch and thermal characteristics
• Compliance: ROHS3 compliance and EAR99 classification

The ADS7956SDBTR qualifies as a substitute based on matching resolution, architecture, interface protocol, and compliance standards. While this substitute offers enhanced specifications in sampling rate and input channel count, these parameters represent functional improvements rather than incompatibilities.

Parameter Comparison

Engineering Selection Recommendations

The ADS7956SDBTR is an active product with ROHS3 compliance and EAR99 classification, matching the regulatory and compliance profile of the TLV1508IPWR. The substitute maintains 10-bit resolution and SAR architecture with SPI interface compatibility, ensuring functional equivalence for data acquisition applications.

Design considerations for substitution include package footprint differences (20-TSSOP versus 38-TFSOP), which require PCB layout modifications. The ADS7956SDBTR offers extended operating temperature range (-40°C to 125°C versus -40°C to 85°C) and higher sampling rate capability (1 MSPS versus 200 kSPS), providing performance headroom for existing applications. The substitute supports 12 input channels compared to 4 channels in the original part, allowing for expanded analog input capacity without additional devices.

Frequently Asked Questions (FAQ)

Q: Can the ADS7956SDBTR directly replace the TLV1508IPWR without PCB modifications?

A: The ADS7956SDBTR requires PCB layout changes due to different package types (38-TFSOP versus 20-TSSOP). Pin count and spacing differ between the two devices, necessitating schematic and layout redesign.

Q: Are the SPI interface protocols identical between these devices?

A: Both devices use SPI serial communication protocol. Detailed timing specifications and command structures must be verified against respective datasheets to ensure software compatibility.

Q: What is the impact of the different supply voltage ranges?

A: The ADS7956SDBTR analog supply range (2.7V to 5.25V) is slightly narrower than the TLV1508IPWR (2.7V to 5.5V). Applications operating at 5.5V analog supply require verification of substitute compatibility. The ADS7956SDBTR digital supply range extends lower (1.7V minimum), providing additional flexibility for low-power designs.

Q: Does the higher sampling rate of the ADS7956SDBTR affect existing firmware?

A: The substitute's 1 MSPS sampling rate is a performance enhancement. Existing firmware designed for 200 kSPS operation remains functional; however, the substitute enables higher-speed data acquisition if required by application updates.

Q: What are the reference voltage differences between these parts?

A: The TLV1508IPWR supports both external and internal reference types. The ADS7956SDBTR supports external reference only. Applications utilizing internal reference require external reference circuit implementation for the substitute.

Q: How do the input channel counts affect system design?

A: The TLV1508IPWR provides 4 single-ended inputs; the ADS7956SDBTR provides 12 single-ended inputs. Designs using fewer than 4 channels can utilize the substitute without modification. Designs requiring more than 4 channels benefit from the expanded input capacity of the substitute.