ADS7811U Equivalent & Substitute Parts

Part Overview

The ADS7811U is a 16-bit Analog to Digital Converter (ADC) manufactured by Texas Instruments, designed for single-ended input data acquisition applications. It features a SAR (Successive Approximation Register) architecture with a 250 kSPS sampling rate and operates with external or internal voltage references. The device is packaged in a 28-SOIC surface mount package and is currently in Last Time Buy status, making identification of equivalent and substitute parts essential for ongoing design support and procurement planning.

Substiute Parts

ADS7811U

Texas InstrumentsIn Stock: 1542ADS7811U Datasheet

Current PartRFQ

ADS9224RIRHBR

Texas InstrumentsIn Stock: 3585ADS9224RIRHBR Datasheet

MFR RecommendedRFQ

AD976BRZRL

Analog Devices Inc.In Stock: 798AD976BRZRL Datasheet

MFR RecommendedRFQ

ADS7815U

Texas InstrumentsIn Stock: 1183ADS7815U Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the ADS7811U are classified based on compatibility with the following critical parameters:

Primary Substitution Criteria:

• Resolution: 16-bit ADC architecture
• Sampling Rate: Minimum 250 kSPS capability
• Input Configuration: Single-ended input support
• Data Interface: Parallel interface compatibility
• Package: 28-SOIC form factor
• Supply Voltage: 5V digital supply compatibility
• Reference: External and internal reference support

Substitution Categories:

MFR Recommended Substitute (Form Factor Compatible): AD976BRZRL meets the core functional requirements with identical 28-SOIC packaging, single-ended input, parallel interface, and 16-bit resolution. This part maintains direct pin and functional compatibility while offering active product status.

Parametric Equivalent (Identical Specifications): ADS7815U provides identical electrical specifications, sampling rate, and packaging to the ADS7811U, serving as a direct parametric replacement within the Texas Instruments product line.

Functional Alternative (Enhanced Capability): ADS9224RIRHBR offers 16-bit resolution with higher sampling rate (3 MSPS) and dual differential inputs, though it requires interface adaptation due to SPI protocol and different packaging (32-VQFN).

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Recommended): ADS7815U is the optimal choice for direct substitution. It maintains identical electrical specifications, sampling rate, packaging, and reference architecture as the ADS7811U. Both devices share Last Time Buy status, indicating similar lifecycle positioning within Texas Instruments product lines.

For Active Product Status: AD976BRZRL provides an active product alternative with identical 28-SOIC packaging and parallel interface. The reduced sampling rate (100 kSPS versus 250 kSPS) must be evaluated against application requirements. This part is suitable for applications where the lower sampling rate is acceptable and active product support is prioritized.

For Enhanced Performance Requirements: ADS9224RIRHBR offers significantly higher sampling rate (3 MSPS) and dual-channel capability with differential inputs. Implementation requires interface redesign due to SPI protocol and different packaging. This part is appropriate for applications requiring higher sampling rates and differential input capability, with corresponding PCB layout modifications.

Compliance Considerations: All substitute parts maintain ROHS3 compliance and EAR99 export classification. The ADS9224RIRHBR features improved moisture sensitivity (MSL 2 versus MSL 3), providing enhanced reliability in humid storage and operational environments.

Frequently Asked Questions (FAQ)

Q: Can AD976BRZRL directly replace ADS7811U in existing designs? A: AD976BRZRL shares identical 28-SOIC packaging and parallel interface, enabling direct PCB-level replacement. However, the sampling rate is reduced from 250 kSPS to 100 kSPS. Verify that application timing requirements are satisfied at the lower sampling rate before implementation.

Q: What is the primary difference between ADS7811U and ADS7815U? A: ADS7815U is a parametric equivalent with identical specifications. Both devices feature 16-bit resolution, 250 kSPS sampling rate, single-ended input, parallel interface, and 28-SOIC packaging. Both are in Last Time Buy status.

Q: When should ADS9224RIRHBR be considered as a substitute? A: ADS9224RIRHBR is suitable when applications require higher sampling rates (3 MSPS) or dual-channel differential input capability. Implementation requires interface redesign due to SPI protocol and 32-VQFN packaging. This part is not a direct pin-compatible replacement.

Q: Are all substitute parts RoHS compliant? A: Yes, all listed substitute parts (AD976BRZRL, ADS7815U, and ADS9224RIRHBR) are ROHS3 compliant and meet REACH requirements.

Q: What packaging considerations apply to each substitute? A: AD976BRZRL and ADS7815U maintain the 28-SOIC package, enabling direct PCB compatibility. ADS9224RIRHBR uses 32-VQFN (5x5) packaging, requiring PCB layout modifications and different footprint design.

Q: Which substitute offers the best long-term availability? A: AD976BRZRL and ADS9224RIRHBR are in Active product status, providing extended availability and manufacturer support. ADS7815U shares Last Time Buy status with the ADS7811U.