ADS7813UB Equivalent & Substitute Parts

Part Overview

The ADS7813UB is a 16-bit Analog to Digital Converter (ADC) manufactured by Texas Instruments, designed for single-ended input data acquisition applications. It features a Successive Approximation Register (SAR) architecture with a 40 kHz sampling rate and operates on 5V supply voltage. The device is packaged in a 16-SOIC surface mount package.

The ADS7813UB is classified as Last Time Buy, indicating that Texas Instruments has discontinued this product line. Finding equivalent or substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support long-term production requirements.

Substiute Parts

ADS7813UB

Texas InstrumentsIn Stock: 1562ADS7813UB Datasheet

Current PartRFQ

ADS8685IPWR

Texas InstrumentsIn Stock: 17932ADS8685IPWR Datasheet

MFR RecommendedRFQ

ADS7813U

Texas InstrumentsIn Stock: 1472ADS7813U Datasheet

Parametric EquivalentRFQ

ADS8513IBDW

Texas InstrumentsIn Stock: 1689ADS8513IBDW Datasheet

Parametric EquivalentRFQ

ADS8513IDW

Texas InstrumentsIn Stock: 1341ADS8513IDW Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the ADS7813UB are classified into two categories based on parametric equivalence and manufacturer recommendation:

Parametric Equivalents (Same Package, Same Core Specifications): ADS7813U, ADS8513IBDW, and ADS8513IDW maintain identical electrical specifications to the ADS7813UB: 16-bit resolution, 40 kHz sampling rate, single-ended input, SPI interface, SAR architecture, 5V analog and digital supply voltage, and -40°C to 85°C operating temperature range. All three are packaged in 16-SOIC and support both external and internal reference types. These parts are direct functional replacements with no design modifications required.

Manufacturer Recommended Substitute (Enhanced Performance): ADS8685IPWR is designated as the manufacturer-recommended upgrade path. While maintaining 16-bit resolution, single input, SPI interface, and SAR architecture, it offers enhanced specifications: 500 kHz sampling rate (12.5× faster), integrated Programmable Gain Amplifier (PGA), pseudo-differential input capability in addition to single-ended, and extended digital supply voltage range (1.65V to 5.25V). The ADS8685IPWR is packaged in 16-TSSOP and has Active product status. This substitute requires PCB layout modifications due to different package geometry but provides superior performance headroom.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (No Design Changes): Select ADS8513IBDW or ADS8513IDW for immediate substitution. Both parts maintain identical electrical and mechanical specifications to the ADS7813UB and are packaged in the same 16-SOIC form factor. Both have Active product status, ensuring long-term availability and supply chain stability. ADS8513IBDW and ADS8513IDW differ only in packaging format (Tube vs. alternative distribution), with no functional differences. MSL rating of 2 (1 Year) provides superior moisture protection compared to the original part's MSL 3 rating.

ADS7813U is also electrically equivalent but retains Last Time Buy status, making it unsuitable for new long-term designs despite identical specifications.

For Enhanced Performance (Design Modification Required): Select ADS8685IPWR when application requirements permit PCB layout changes. This part offers 12.5× higher sampling rate (500 kHz vs. 40 kHz), integrated PGA for signal conditioning, and extended operating temperature range (-40°C to 125°C). The 16-TSSOP package is smaller than 16-SOIC, requiring PCB redesign. Active product status guarantees sustained availability. The extended digital supply voltage range (1.65V to 5.25V) provides flexibility for mixed-voltage systems.

All recommended substitutes maintain ROHS3 compliance and EAR99 export classification.

Frequently Asked Questions (FAQ)

Q: Can ADS8513IBDW and ADS8513IDW be used interchangeably with ADS7813UB without PCB modifications?

A: Yes. Both parts are packaged in identical 16-SOIC form factor with matching pin assignments, electrical specifications, and operating parameters. No PCB layout changes are required for direct substitution.

Q: What is the primary advantage of ADS8685IPWR over the parametric equivalents?

A: ADS8685IPWR provides 500 kHz sampling rate compared to 40 kHz in the original and parametric equivalents, enabling 12.5× faster data acquisition. It also includes an integrated Programmable Gain Amplifier (PGA) for on-chip signal conditioning and supports pseudo-differential input mode in addition to single-ended operation. However, the 16-TSSOP package requires PCB redesign.

Q: Why is ADS7813U not recommended despite being electrically identical?

A: ADS7813U carries Last Time Buy status, indicating Texas Instruments has discontinued production. For designs requiring long-term component availability and supply chain continuity, ADS8513IBDW or ADS8513IDW are preferred as they maintain Active product status.

Q: Are there any compliance or certification differences between the substitute parts?

A: All substitute parts maintain ROHS3 compliance, REACH Unaffected status, and EAR99 export classification identical to the ADS7813UB. MSL ratings differ: ADS8513IBDW and ADS8513IDW have MSL 2 (1 Year), providing superior moisture protection compared to ADS7813UB's MSL 3 (168 Hours).

Q: What is the impact of the different package types (16-SOIC vs. 16-TSSOP)?

A: 16-SOIC and 16-TSSOP are distinct surface mount packages with different footprints, lead spacing, and soldering requirements. Direct PCB substitution between these packages is not possible without layout redesign. 16-TSSOP is physically smaller, which may be advantageous in space-constrained applications but requires new PCB artwork and assembly process validation.

Q: Can the ADS8685IPWR's extended digital supply voltage range (1.65V to 5.25V) be utilized in a 5V-only system?

A: Yes. The ADS8685IPWR operates across 1.65V to 5.25V, making it fully compatible with 5V systems. The extended range provides design flexibility for future applications requiring lower digital supply voltages but does not mandate their use.