ADS7805PB Equivalent & Substitute Parts

Part Overview

The ADS7805PB is a 16-bit Analog to Digital Converter manufactured by Texas Instruments, designed for single-ended input data acquisition applications. This device features a Successive Approximation Register (SAR) architecture with parallel data interface and operates from a 5V supply. The ADS7805PB is classified as obsolete, making identification of active equivalent parts essential for new designs and ongoing system support.

Substiute Parts

ADS7805PB

Texas InstrumentsIn Stock: 2024ADS7805PB Datasheet

Current PartRFQ

ADS8505IBDW

Texas InstrumentsIn Stock: 2697ADS8505IBDW Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ADS7805PB is determined by the following critical parameters that must remain constant or compatible:

Core Functional Parameters:

• Resolution: 16 bits (must match)
• Number of Inputs: 1 (must match)
• Input Type: Single Ended (must match)
• Data Interface: Parallel (must match)
• Architecture: SAR (must match)
• Reference Type: External, Internal (must match)
• Supply Voltage: 5V Analog and Digital (must match)

Allowable Variations:

• Sampling Rate: May increase from 100k per second (higher sampling rates are backward compatible)
• Operating Temperature: May expand range (wider temperature range is acceptable)
• Package Type: May change from Through Hole DIP to Surface Mount SOIC (requires PCB redesign)
• Mounting Type: May transition from Through Hole to Surface Mount
• Product Status: Active parts preferred over obsolete

The ADS8505IBDW meets all core functional requirements while offering improved specifications and active product status.

Parameter Comparison

Engineering Selection Recommendations

The ADS8505IBDW is the manufacturer-recommended substitute for the obsolete ADS7805PB. Both devices maintain identical core functionality as 16-bit SAR analog-to-digital converters with single-ended input and parallel data interface.

Advantages of ADS8505IBDW:

• Active product status ensures long-term availability and support
• Increased sampling rate of 250k per second provides enhanced performance headroom
• Extended operating temperature range (-40°C to 85°C) covers broader environmental conditions
• Improved moisture sensitivity level (MSL 2) reduces handling and storage constraints
• ROHS3 compliance maintained

Design Considerations:

• Package transition from 28-DIP (Through Hole) to 28-SOIC (Surface Mount) requires PCB redesign
• Physical footprint dimensions differ: DIP 0.300" versus SOIC 0.295" width
• Surface mount assembly process differs from through-hole insertion
• Both devices maintain ROHS3 compliance and REACH unaffected status

Frequently Asked Questions (FAQ)

Q: Can the ADS8505IBDW directly replace the ADS7805PB without design changes?

A: Functional substitution is complete. However, the package change from 28-DIP to 28-SOIC requires PCB redesign. The electrical interface, pin configuration, and signal protocols are compatible.

Q: What is the impact of the increased sampling rate (250k vs 100k)?

A: The higher sampling rate of the ADS8505IBDW is backward compatible. Systems designed for 100k sampling rate will operate correctly with the substitute part. The increased capability does not introduce incompatibility.

Q: Does the extended operating temperature range (-40°C to 85°C) affect compatibility?

A: The expanded temperature range of the ADS8505IBDW is a superset of the original ADS7805PB range (-25°C to 85°C). This provides improved environmental coverage with no negative impact on existing designs.

Q: What are the implications of the MSL rating change from 3 to 2?

A: The improved MSL rating (2 versus 3) reduces moisture sensitivity. MSL 2 allows 1 year of shelf life compared to MSL 3's 168 hours, resulting in lower handling and storage costs.

Q: Are there any compliance or certification differences?

A: Both parts maintain ROHS3 compliance and REACH unaffected status. No compliance disadvantages exist with the substitute part.

Q: What mounting considerations apply to the package transition?

A: The ADS7805PB uses through-hole DIP mounting suitable for breadboards and traditional PCB assembly. The ADS8505IBDW uses surface mount SOIC technology, requiring reflow soldering and modern PCB assembly equipment. This is a manufacturing process change, not a functional limitation.