ADS7804UG4 Equivalent & Substitute Parts

Part Overview

The ADS7804UG4 is a 12-bit Analog to Digital Converter (ADC) with single-ended input, SAR architecture, and parallel data interface, manufactured by Texas Instruments in 28-SOIC surface mount packaging. The device operates at 100k samples per second with external or internal reference capability and dual 5V supply rails.

The ADS7804UG4 is classified as Obsolete, making substitute parts necessary for new designs and ongoing production support. Equivalent alternatives maintain identical electrical and mechanical specifications while offering improved availability and product lifecycle status.

Key Parameters

Parameter	Value
Resolution	12 Bit
Sampling Rate	100k Samples Per Second
Number of Inputs	1
Input Type	Single Ended
Data Interface	Parallel
Architecture	SAR (Successive Approximation Register)
Reference Type	External, Internal
Analog Supply Voltage	5V
Digital Supply Voltage	5V
Operating Temperature Range	-40°C to 85°C
Package Type	28-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	3 (168 Hours)

Substitute Part Grouping Explanation

Substitute parts for the ADS7804UG4 are qualified based on strict parameter matching across electrical and mechanical specifications. The substitution logic is based on the following criteria:

Primary Substitution Criteria:

Resolution: 12 Bit
Sampling Rate: 100k Samples Per Second
Number of Inputs: 1
Input Type: Single Ended
Data Interface: Parallel
Architecture: SAR
Reference Type: External, Internal
Supply Voltages: 5V Analog and Digital
Operating Temperature: -40°C to 85°C
Package: 28-SOIC Surface Mount
Compliance: ROHS3, MSL 3

All substitute parts listed maintain 100% electrical and mechanical compatibility with the original ADS7804UG4 specification. Differences exist only in product lifecycle status and packaging format, which do not affect functional performance in equivalent applications.

Parameter Comparison

Parameter	ADS7804UG4	ADS7804U	ADS7804UB
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments
Resolution	12 Bit	12 Bit	12 Bit
Sampling Rate	100k SPS	100k SPS	100k SPS
Number of Inputs	1	1	1
Input Type	Single Ended	Single Ended	Single Ended
Data Interface	Parallel	Parallel	Parallel
Architecture	SAR	SAR	SAR
Reference Type	External, Internal	External, Internal	External, Internal
Analog Supply	5V	5V	5V
Digital Supply	5V	5V	5V
Operating Temperature	-40°C to 85°C	-40°C to 85°C	-40°C to 85°C
Package	28-SOIC	28-SOIC	28-SOIC
Mounting Type	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)
Product Status	Obsolete	Last Time Buy	Last Time Buy
Packaging Format	Standard	Tube	Tube

Engineering Selection Recommendations

ADS7804U is the manufacturer-recommended substitute for ADS7804UG4. This part maintains identical electrical specifications and 28-SOIC package configuration while offering Last Time Buy product status with significantly higher inventory availability (3500 units). The tube packaging format provides standard handling and storage compatibility with surface mount assembly processes.

ADS7804UB is a parametric equivalent offering identical functional and mechanical specifications to ADS7804UG4. This part also carries Last Time Buy status with robust inventory levels (3300 units) and tube packaging. Selection between ADS7804U and ADS7804UB should be based on procurement lead times and supply chain requirements, as both parts are electrically and mechanically interchangeable.

Both substitute parts are ROHS3 compliant and maintain MSL 3 moisture sensitivity rating, ensuring compatibility with standard PCB assembly and storage protocols. No design modifications or board-level changes are required when substituting either part for the obsolete ADS7804UG4.

Frequently Asked Questions (FAQ)

Q: Can ADS7804U or ADS7804UB be used as direct replacements for ADS7804UG4 without circuit modifications?

A: Yes. Both substitute parts are electrically and mechanically identical to ADS7804UG4. Pin configuration, signal levels, supply requirements, and timing specifications are unchanged. Direct substitution requires no schematic or PCB layout modifications.

Q: What is the difference between ADS7804U and ADS7804UB?

A: Both parts are parametrically equivalent with identical electrical performance and 28-SOIC packaging. The only differences are product lifecycle status (both Last Time Buy) and internal manufacturing variations that do not affect functional operation. Selection can be based on availability and procurement timing.

Q: Are the substitute parts compatible with existing PCB designs for ADS7804UG4?

A: Yes. The 28-SOIC package footprint, pin assignments, and electrical interface are identical across all three parts. Existing PCB layouts and assembly processes require no modification.

Q: What is the significance of the product status change from Obsolete to Last Time Buy?

A: Last Time Buy status indicates extended availability with defined end-of-life dates, providing a transition period for design migration or inventory planning. This status offers better supply security compared to Obsolete parts, which have no guaranteed availability.

Q: Are moisture sensitivity and RoHS compliance identical across all three parts?

A: Yes. All three parts carry MSL 3 (168 Hours) rating and ROHS3 compliance. Storage, handling, and environmental requirements are identical.

Q: Can I mix ADS7804U and ADS7804UB in the same production batch?

A: Yes. Both parts are parametrically equivalent and functionally interchangeable. Mixed sourcing is acceptable for production continuity when single-source availability is constrained.

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