ADS7805UG4 Equivalent & Substitute Parts

Part Overview

The ADS7805UG4 is a 16-bit Analog-to-Digital Converter (ADC) manufactured by Texas Instruments, configured as a single-input SAR (Successive Approximation Register) architecture device in 28-SOIC surface mount packaging. This component operates with 5V analog and digital supply voltages, achieving a 100 kHz sampling rate with external or internal reference capability.

The ADS7805UG4 is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this data acquisition topology.

Key Parameters

Parameter	Value
Resolution	16 Bit
Number of Inputs	1
Input Type	Single Ended
Architecture	SAR
Sampling Rate	100 kHz
Data Interface	Parallel
Reference Type	External, Internal
Voltage - Supply, Analog	5V
Voltage - Supply, Digital	5V
Package / Case	28-SOIC (0.295", 7.50mm Width)
Operating Temperature Range	-25°C ~ 85°C
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution eligibility for the ADS7805UG4 is determined by strict alignment across the following critical parameters:

Resolution: 16 Bit (mandatory match)
Architecture: SAR (mandatory match)
Number of Inputs: 1 (mandatory match)
Input Type: Single Ended (mandatory match)
Data Interface: Parallel (mandatory match)
Reference Type: External, Internal (mandatory match)
Voltage - Supply, Analog: 5V (mandatory match)
Voltage - Supply, Digital: 5V (mandatory match)
Package / Case: 28-SOIC (mandatory match)
Mounting Type: Surface Mount (mandatory match)

Substitute parts are grouped into two categories based on sampling rate capability:

Category 1: 100 kHz Sampling Rate (Direct Functional Equivalents) Parts maintaining the original 100 kHz sampling rate specification: AD976ARZ, AD976ARZRL, AD976CRZ, LTC1605CSW#PBF, LTC1605CSW#TRPBF, LTC1605ISW#PBF

Category 2: 200 kHz Sampling Rate (Enhanced Performance) Parts offering doubled sampling rate while maintaining all other electrical and mechanical parameters: AD976AARZ, AD976AARZ-RL, AD976ACRZ

All substitute parts maintain identical package geometry, pinout compatibility, supply voltage requirements, and data interface specifications. Differences in operating temperature range and product status are noted but do not affect functional substitution eligibility.

Parameter Comparison

Part Number	Manufacturer	Resolution	Sampling Rate	Operating Temperature	Product Status	Packaging	Inventory
ADS7805UG4	Texas Instruments	16 Bit	100 kHz	-25°C ~ 85°C	Obsolete	28-SOIC	991 Pcs
AD976ARZ	Analog Devices Inc.	16 Bit	100 kHz	-40°C ~ 85°C	Active	28-SOIC (Tube)	3469 Pcs
AD976ARZRL	Analog Devices Inc.	16 Bit	100 kHz	-40°C ~ 85°C	Active	28-SOIC (CT & Digi-Reel)	2360 Pcs
AD976CRZ	Analog Devices Inc.	16 Bit	100 kHz	-40°C ~ 85°C	Active	28-SOIC (Tube)	3866 Pcs
AD976AARZ	Analog Devices Inc.	16 Bit	200 kHz	-40°C ~ 85°C	Active	28-SOIC (Tube)	1405 Pcs
AD976AARZ-RL	Analog Devices Inc.	16 Bit	200 kHz	-40°C ~ 85°C	Active	28-SOIC (TR)	1698 Pcs
AD976ACRZ	Analog Devices Inc.	16 Bit	200 kHz	-40°C ~ 85°C	Active	28-SOIC (Tube)	3300 Pcs
LTC1605CSW#PBF	Analog Devices Inc.	16 Bit	100 kHz	0°C ~ 70°C	Active	28-SOIC (Tube)	2300 Pcs
LTC1605CSW#TRPBF	Analog Devices Inc.	16 Bit	100 kHz	0°C ~ 70°C	Active	28-SOIC (TR)	1034 Pcs
LTC1605ISW#PBF	Analog Devices Inc.	16 Bit	100 kHz	-40°C ~ 85°C	Active	28-SOIC (Tube)	2100 Pcs

Engineering Selection Recommendations

All listed substitute parts are manufactured by Analog Devices Inc. and maintain active product status, ensuring long-term supply chain viability and technical support availability. All parts are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

For applications requiring direct functional equivalence at 100 kHz sampling rate, select from the AD976 series (AD976ARZ, AD976ARZRL, AD976CRZ) or LTC1605 series (LTC1605CSW#PBF, LTC1605CSW#TRPBF, LTC1605ISW#PBF). The AD976 series offers extended operating temperature range (-40°C ~ 85°C) compared to the original ADS7805UG4 specification (-25°C ~ 85°C), providing enhanced thermal margin.

For applications where increased sampling rate provides system benefit, the AD976A series (AD976AARZ, AD976AARZ-RL, AD976ACRZ) delivers 200 kHz sampling capability while maintaining all other electrical and mechanical compatibility parameters.

Packaging selection should align with production methodology: tube packaging for manual assembly or low-volume operations; tape & reel or cut tape formats for automated pick-and-place assembly.

Frequently Asked Questions (FAQ)

Q: Can AD976AARZ (200 kHz) be used as a direct replacement for ADS7805UG4 (100 kHz)?

A: Yes. The AD976AARZ maintains identical electrical specifications for resolution, input configuration, reference type, supply voltages, and package geometry. The increased sampling rate does not create incompatibility; it represents enhanced performance capability. Firmware or application software may require validation to confirm the higher sampling rate does not introduce timing conflicts in the signal processing chain.

Q: What is the difference between AD976ARZ and AD976ARZRL?

A: Both parts are identical in electrical specification and sampling rate (100 kHz). The difference is packaging format: AD976ARZ is supplied in tube packaging; AD976ARZRL is supplied in cut tape and Digi-Reel format. Selection depends on assembly equipment capability and production volume requirements.

Q: Why do LTC1605 parts specify 0°C ~ 70°C operating temperature while AD976 parts specify -40°C ~ 85°C?

A: Operating temperature range is a specified parameter that reflects the manufacturer's tested and validated performance envelope. LTC1605CSW#PBF and LTC1605CSW#TRPBF are rated for commercial temperature range (0°C ~ 70°C), while LTC1605ISW#PBF and all AD976 variants are rated for industrial temperature range (-40°C ~ 85°C). Selection should match the application's thermal environment requirements.

Q: Are all substitute parts pin-compatible with ADS7805UG4?

A: Yes. All substitute parts use identical 28-SOIC package geometry (0.295", 7.50mm width) with surface mount configuration. Pin assignments for data interface, supply voltages, and reference inputs are functionally equivalent across all listed parts.

Q: What does MSL 3 (168 Hours) mean for moisture sensitivity?

A: Moisture Sensitivity Level 3 indicates the component requires controlled storage conditions and has a floor life of 168 hours after exposure to ambient humidity. Components must be stored in dry conditions and baked according to IPC-A-610 standards before reflow soldering. LTC1605 parts carry MSL 1 (Unlimited), indicating no moisture sensitivity restrictions.

Q: Can I mix substitute parts from different manufacturers in the same production run?

A: All listed substitutes are manufactured by Analog Devices Inc. (the ADS7805UG4 is from Texas Instruments). While electrical parameters are equivalent, design validation should confirm that any manufacturer change does not introduce unintended behavioral differences in the specific application circuit.

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