ADS7825UB/1K Equivalent & Substitute Parts

Part Overview

The ADS7825UB/1K is a 16-bit Analog to Digital Converter manufactured by Texas Instruments, designed for data acquisition applications requiring 4 single-ended inputs with a 40 kSPS sampling rate. The device operates on 5V supply for both analog and digital domains and features a SAR (Successive Approximation Register) architecture with external and internal reference options. The part is currently in Last Time Buy status, indicating production discontinuation. Alternative components are necessary to ensure long-term design sustainability and continued component availability.

Substiute Parts

ADS7825UB/1K

Texas InstrumentsIn Stock: 660ADS7825UB/1K Datasheet

Current PartRFQ

ADS8688IDBTR

Texas InstrumentsIn Stock: 33322ADS8688IDBTR Datasheet

MFR RecommendedRFQ

ADS7825U/1K

Texas InstrumentsIn Stock: 1108ADS7825U/1K Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the ADS7825UB/1K are identified based on the following critical parameters that determine functional compatibility:

Core Substitution Criteria:

• Resolution: 16-bit ADC architecture
• Conversion Method: SAR (Successive Approximation Register)
• Reference Options: External and Internal reference support
• Supply Voltage Compatibility: 5V analog supply capability
• Data Interface: SPI or Parallel communication protocols
• Manufacturer: Texas Instruments

Substitutes are grouped into two categories:

1. Parametric Equivalent (ADS7825U/1K): Identical electrical and mechanical specifications with identical package format (28-SOIC). Direct pin-compatible replacement.

2. Manufacturer Recommended Substitute (ADS8688IDBTR): Enhanced performance characteristics with expanded input channels and higher sampling rate. Requires PCB layout and firmware modifications due to different package format and interface configuration.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Pin-Compatible): Select ADS7825U/1K when immediate substitution is required without PCB modifications. This part maintains identical electrical specifications, package format, and pinout. Both the main part and this equivalent are in Last Time Buy status, so long-term availability planning remains necessary.

For New Designs or Long-Term Availability: Select ADS8688IDBTR for applications requiring sustained component availability and extended product lifecycle. This part is in Active production status, ensuring continued supply. The ADS8688IDBTR offers enhanced specifications including 500 kSPS sampling rate, 8 input channels, and extended digital supply voltage range (1.65V to 5.25V). Implementation requires PCB redesign due to 38-TSSOP package format and modified interface configuration. The extended operating temperature range (-40°C to 125°C) and improved MSL rating (2 vs. 3) provide additional design margin.

All substitute parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory consistency with the original component.

Frequently Asked Questions (FAQ)

Q: Can ADS7825U/1K be used as a direct replacement for ADS7825UB/1K? A: Yes. Both parts are identical in electrical specifications, pinout, and package format (28-SOIC). No PCB modifications are required. However, both parts are in Last Time Buy status.

Q: What are the key differences between ADS7825UB/1K and ADS8688IDBTR? A: The ADS8688IDBTR offers higher sampling rate (500 kSPS vs. 40 kSPS), more input channels (8 vs. 4), differential input capability, and Active product status. The package format differs (38-TSSOP vs. 28-SOIC), requiring PCB layout changes and firmware modifications for the SPI-only interface.

Q: Is ADS8688IDBTR pin-compatible with ADS7825UB/1K? A: No. The ADS8688IDBTR uses a 38-TSSOP package compared to the 28-SOIC package of the ADS7825UB/1K. Pinout and interface configuration differ, requiring complete PCB redesign.

Q: Why is ADS7825UB/1K in Last Time Buy status? A: Last Time Buy status indicates Texas Instruments has discontinued production planning for this part. Existing inventory is available, but no future production is scheduled. Alternative components should be evaluated for new designs.

Q: Are all substitute parts RoHS compliant? A: Yes. ADS7825UB/1K, ADS7825U/1K, and ADS8688IDBTR are all ROHS3 compliant and REACH unaffected.

Q: What is the MSL rating difference, and does it matter? A: ADS7825UB/1K and ADS7825U/1K have MSL 3 (168 hours), while ADS8688IDBTR has MSL 2 (1 year). MSL 2 provides longer shelf life and greater tolerance to moisture exposure during storage and handling.

Q: Can I use ADS8688IDBTR in an existing ADS7825UB/1K design without modifications? A: No. The different package, pinout, interface configuration, and increased input channels require complete PCB redesign and firmware updates. This is suitable only for new designs or major design revisions.