ADS774KU Equivalent & Substitute Parts

Part Overview

The ADS774KU 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 sampling rate of 125 kSPS and operates from a 5V analog supply with external or internal reference voltage options. The device is packaged in a 28-SOIC surface-mount package.

The ADS774KU is currently designated as Last Time Buy, indicating that Texas Instruments has discontinued this product line. Finding equivalent or substitute parts is necessary for ongoing production support, design updates, or inventory replenishment when the original part becomes unavailable.

Substiute Parts

ADS774KU

Texas InstrumentsIn Stock: 1551ADS774KU Datasheet

Current PartRFQ

ADS8665IPWR

Texas InstrumentsIn Stock: 15306ADS8665IPWR Datasheet

MFR RecommendedRFQ

ADS774HIBDW

Texas InstrumentsIn Stock: 1911ADS774HIBDW Datasheet

Parametric EquivalentRFQ

ADS774HIDW

Texas InstrumentsIn Stock: 1145ADS774HIDW Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the ADS774KU is determined by the following critical parameters:

• Resolution: 12-bit ADC capability
• Architecture: SAR-based conversion
• Single Input Channel: One analog input required
• Parallel Data Interface: Output data format compatibility
• Supply Voltage Compatibility: 5V analog supply operation
• Package Form Factor: Surface-mount compatibility

Substitute parts are grouped into two categories:

Parametric Equivalents (ADS774HIBDW, ADS774HIDW): These parts maintain identical electrical specifications, architecture, and packaging as the ADS774KU. They differ only in product status and packaging format (Tube instead of standard packaging). These are direct functional replacements with no design modifications required.

Manufacturer Recommended Substitute (ADS8665IPWR): This part shares the same 12-bit resolution and SAR architecture but introduces significant differences in interface protocol (SPI instead of Parallel), input configuration (Differential/Pseudo-Differential/Single Ended), and package form factor (16-TSSOP instead of 28-SOIC). This substitute requires design-level integration changes and is suitable only when system architecture can accommodate the different interface and packaging requirements.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (No Design Changes Required):

Select ADS774HIBDW or ADS774HIDW when maintaining existing designs or requiring immediate compatibility with current PCB layouts and firmware. Both parts are parametric equivalents with identical electrical performance and 28-SOIC packaging. ADS774HIBDW offers improved moisture sensitivity rating (MSL 2 vs. MSL 3), providing better reliability in humid storage and assembly environments. Both parts carry "Not For New Designs" status, indicating they are available for legacy support only.

For New Designs or Long-Term Availability:

Select ADS8665IPWR when designing new systems or requiring extended product lifecycle support. This part carries Active product status from Texas Instruments, ensuring continued availability and manufacturing support. The ADS8665IPWR provides higher sampling rate (500 kSPS vs. 125 kSPS), extended operating temperature range (-40°C to 125°C), and flexible input configuration options. However, integration requires accommodation of SPI serial interface instead of parallel output, smaller 16-TSSOP package footprint, and internal reference voltage only (no external reference option).

All substitute parts maintain ROHS3 compliance and EAR99 export classification consistent with the original ADS774KU.

Frequently Asked Questions (FAQ)

Q: Can ADS774HIBDW and ADS774HIDW be used interchangeably with ADS774KU?

A: Yes. Both parts are parametric equivalents with identical electrical specifications, resolution, sampling rate, input configuration, and package form factor. The only differences are product status designation and packaging format (Tube). No circuit modifications or firmware changes are required.

Q: What are the key differences between ADS774KU and ADS8665IPWR?

A: The primary differences are: (1) Data Interface—ADS8665IPWR uses SPI serial protocol instead of parallel output, requiring different microcontroller interface logic; (2) Package—ADS8665IPWR uses 16-TSSOP instead of 28-SOIC, affecting PCB layout and pin routing; (3) Reference Voltage—ADS8665IPWR provides internal reference only, eliminating external reference flexibility; (4) Sampling Rate—ADS8665IPWR operates at 500 kSPS versus 125 kSPS; (5) Input Configuration—ADS8665IPWR supports differential and pseudo-differential inputs in addition to single-ended.

Q: Is ADS8665IPWR suitable for direct PCB replacement of ADS774KU?

A: No. The different package (16-TSSOP vs. 28-SOIC), pin configuration, and serial interface (SPI vs. Parallel) require PCB redesign and firmware modification. This substitute is appropriate only for new system designs where the interface and package changes can be accommodated.

Q: Why is ADS774KU designated as Last Time Buy?

A: Last Time Buy status indicates Texas Instruments has discontinued this product line. Existing inventory is available for a limited time, after which the part will no longer be manufactured or supplied. Planning for substitute parts is necessary for production continuity beyond the Last Time Buy window.

Q: What is the moisture sensitivity difference between ADS774HIBDW and ADS774HIDW?

A: ADS774HIBDW has MSL 2 (1 Year storage limit at specified humidity), while ADS774HIDW has MSL 3 (168 Hours storage limit). MSL 2 provides better protection against moisture absorption during storage and assembly, reducing risk of delamination or electrical failure in humid environments.

Q: Are all substitute parts RoHS compliant?

A: Yes. ADS774KU, ADS774HIBDW, ADS774HIDW, and ADS8665IPWR are all ROHS3 compliant, meeting lead-free and restricted substance requirements for EU and global markets.