ADS7800JU Equivalent & Substitute Parts

Part Overview

The ADS7800JU is a 12-bit Analog to Digital Converter manufactured by Texas Instruments, configured as a single-input SAR (Successive Approximation Register) device in a 24-SOIC surface mount package. This component operates with a 333 kHz sampling rate and supports parallel data interface output. The device is currently in Last Time Buy status, indicating end-of-life production. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain flexibility, and support long-term product availability for applications requiring 12-bit analog conversion functionality.

Substiute Parts

ADS7800JU

Texas InstrumentsIn Stock: 8335ADS7800JU Datasheet

Current PartRFQ

ADS8661IPWR

Texas InstrumentsIn Stock: 1866ADS8661IPWR Datasheet

MFR RecommendedRFQ

ADS7800KU

Burr BrownIn Stock: 2051ADS7800KU Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the ADS7800JU are classified into two categories based on substitution criteria:

Parametric Equivalent (ADS7800KU): This substitute maintains identical electrical and mechanical specifications including 12-bit resolution, 333 kHz sampling rate, single-ended input configuration, parallel data interface, and 24-SOIC packaging. The parametric equivalent differs only in manufacturer (Burr Brown) and packaging format (Bulk vs. standard). This classification allows direct replacement in applications where the original part specifications are mandatory.

MFR Recommended Substitute (ADS8661IPWR): This substitute shares core functional characteristics (12-bit resolution, single input, SAR architecture, internal reference) but introduces controlled parameter variations. Key differences include higher sampling rate (1.25 MHz vs. 333 kHz), SPI data interface (vs. parallel), differential/pseudo-differential input capability (vs. single-ended only), dual supply voltage support (1.65V ~ 3.3V digital, 4.75V ~ 5.25V analog vs. fixed 5V supplies), extended operating temperature range (-40°C ~ 125°C vs. -40°C ~ 85°C), and 16-TSSOP packaging (vs. 24-SOIC). This substitute is suitable for applications where interface flexibility and higher sampling rates provide design advantages.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement: Select ADS7800KU when maintaining identical electrical performance and mechanical form factor is required. This parametric equivalent preserves all functional specifications of the ADS7800JU while offering active product status from Burr Brown. Verify compatibility with existing PCB layouts and supply chain availability prior to design implementation.

For Design Flexibility: Select ADS8661IPWR when application requirements permit interface and packaging modifications. This MFR-recommended substitute provides higher sampling capability (1.25 MHz), expanded input configuration options, and extended temperature range (-40°C ~ 125°C). The SPI interface requires firmware or controller modifications compared to parallel interface operation. The 16-TSSOP package occupies reduced board space but requires PCB redesign. Both substitute options maintain ROHS3 compliance and active product status, supporting long-term supply continuity.

Frequently Asked Questions (FAQ)

Q: Can ADS7800KU be used as a direct drop-in replacement for ADS7800JU? A: Yes. ADS7800KU maintains identical specifications for resolution (12-bit), sampling rate (333 kHz), input configuration (single-ended), data interface (parallel), supply voltages (5V analog and digital), operating temperature range (-40°C ~ 85°C), and package format (24-SOIC). No circuit modifications are required.

Q: What are the primary differences between ADS7800JU and ADS8661IPWR? A: ADS8661IPWR differs in four key areas: (1) Data Interface—SPI instead of parallel, requiring controller firmware changes; (2) Sampling Rate—1.25 MHz vs. 333 kHz, enabling higher-speed applications; (3) Input Configuration—supports differential and pseudo-differential modes in addition to single-ended; (4) Package—16-TSSOP vs. 24-SOIC, requiring PCB redesign. Supply voltage ranges also differ, with ADS8661IPWR supporting 1.65V ~ 3.3V digital supply vs. fixed 5V.

Q: Is ADS8661IPWR suitable for applications currently using ADS7800JU? A: ADS8661IPWR is suitable only if application requirements can accommodate SPI interface operation, higher sampling rates provide design benefits, and PCB layout modifications are feasible. Applications requiring parallel interface operation and fixed 5V digital supply should use ADS7800KU instead.

Q: What packaging considerations apply when selecting substitutes? A: ADS7800KU uses identical 24-SOIC packaging, requiring no PCB modifications. ADS8661IPWR uses 16-TSSOP packaging with smaller footprint (0.173" vs. 0.295" width), necessitating PCB redesign and component placement verification. Verify pad dimensions and spacing compatibility with manufacturing capabilities.

Q: Are both substitute parts RoHS compliant? A: ADS8661IPWR is ROHS3 compliant. ADS7800KU compliance status is not specified in available documentation. Verify RoHS certification with supplier documentation before design release if regulatory compliance is required.

Q: What is the inventory status of substitute parts? A: ADS7800KU has 2030 units in stock. ADS8661IPWR has 1780 units in stock. Both substitutes are classified as active products, supporting ongoing availability. The original ADS7800JU (8274 units) is Last Time Buy status.