ADS7804UB Equivalent & Substitute Parts

Part Overview

The ADS7804UB is a 12-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 100 kSPS sampling rate and operates from a 5V supply in a 28-SOIC surface mount package. The ADS7804UB is classified as Last Time Buy, indicating end-of-life status. Identifying equivalent and substitute parts is necessary to ensure design continuity and maintain component availability for new production runs and legacy system support.

Substiute Parts

ADS7804UB

Texas InstrumentsIn Stock: 3353ADS7804UB Datasheet

Current PartRFQ

ADS8504IBDW

Texas InstrumentsIn Stock: 3155ADS8504IBDW Datasheet

DirectRFQ

ADS8665IPWR

Texas InstrumentsIn Stock: 15306ADS8665IPWR Datasheet

MFR RecommendedRFQ

ADS7804U

Texas InstrumentsIn Stock: 3526ADS7804U Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the ADS7804UB is determined by the following critical parameters: resolution (12-bit), single-ended input capability, SAR architecture, 5V supply compatibility, and surface mount packaging. Substitute parts are grouped into two categories based on compatibility level:

Parametric Equivalent: Parts that maintain identical electrical specifications and package form factor, enabling direct replacement without circuit modification.

Direct Manufacturer Substitute: Parts that share core functionality but may differ in sampling rate, package type, or interface protocol. These require design review and potential circuit adaptation.

The ADS7804U qualifies as a parametric equivalent, maintaining 100 kSPS sampling rate and 28-SOIC packaging. The ADS8504IBDW offers higher sampling performance (250 kSPS) in the same package. The ADS8665IPWR represents a higher-performance alternative with enhanced features but requires package and interface changes.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (No Design Changes): The ADS7804U is the preferred parametric equivalent. It maintains identical electrical specifications, sampling rate, package form factor, and supply voltage requirements. Both parts are Last Time Buy status, so long-term availability is limited for both options.

For Enhanced Performance with Minimal Changes: The ADS8504IBDW provides 2.5× higher sampling rate (250 kSPS) while retaining the 28-SOIC package and parallel interface. This substitute is suitable for applications requiring faster conversion without PCB redesign. The ADS8504IBDW is Active status, providing better long-term availability.

For Advanced Applications with Design Flexibility: The ADS8665IPWR offers the highest sampling rate (500 kSPS), extended temperature range (-40°C to 125°C), and flexible input configurations (differential, pseudo-differential, single-ended). However, this substitute requires circuit redesign due to SPI interface, 16-TSSOP package, and internal reference-only configuration. The ADS8665IPWR is Active status with superior long-term support.

All substitute parts maintain ROHS3 compliance and EAR99 export classification consistent with the ADS7804UB.

Frequently Asked Questions (FAQ)

Q: Can the ADS7804U replace the ADS7804UB directly on the PCB?

A: Yes. The ADS7804U is a parametric equivalent with identical pin configuration, package (28-SOIC), electrical specifications, and supply requirements. No circuit modifications are required.

Q: What is the key difference between ADS8504IBDW and ADS7804UB?

A: The ADS8504IBDW has a 250 kSPS sampling rate compared to the ADS7804UB's 100 kSPS. Both use 28-SOIC packaging and parallel interface. The ADS8504IBDW is Active status, offering better availability. Verify that your application can tolerate the faster conversion rate and any associated timing changes.

Q: Why does the ADS8665IPWR require design changes?

A: The ADS8665IPWR differs in three critical areas: (1) SPI serial interface instead of parallel, (2) 16-TSSOP package instead of 28-SOIC, and (3) internal reference only instead of external/internal options. These differences necessitate PCB layout changes, firmware modifications, and reference circuit redesign.

Q: Are all substitute parts RoHS compliant?

A: Yes. The ADS7804UB, ADS7804U, ADS8504IBDW, and ADS8665IPWR are all ROHS3 compliant.

Q: What is the temperature range difference between ADS7804UB and ADS8665IPWR?

A: The ADS7804UB operates from -40°C to 85°C, while the ADS8665IPWR extends to -40°C to 125°C. The ADS8665IPWR is suitable for high-temperature applications beyond the ADS7804UB's specification.

Q: Which substitute has the best long-term availability?

A: The ADS8504IBDW and ADS8665IPWR are both Active status products, providing superior long-term availability compared to the ADS7804UB and ADS7804U, which are Last Time Buy.