ADS7804P Equivalent & Substitute Parts

Part Overview

The ADS7804P is a 12-bit Analog to Digital Converter manufactured by Texas Instruments, designed for single-ended input data acquisition applications. It features a Successive Approximation Register (SAR) architecture with a 100 kHz sampling rate and operates on 5V supply voltage for both analog and digital domains. The device is packaged in a 28-pin DIP configuration for through-hole mounting.

The ADS7804P is classified as an obsolete product. Finding equivalent or substitute parts is necessary to support legacy system maintenance, design updates, or when original inventory becomes unavailable. Substitute parts must maintain functional equivalence while accommodating potential differences in packaging and performance characteristics.

Substiute Parts

ADS7804P

Texas InstrumentsIn Stock: 2214ADS7804P Datasheet

Current PartRFQ

ADS8504IBDW

Texas InstrumentsIn Stock: 3155ADS8504IBDW Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ADS7804P is based on the following core electrical and mechanical parameters:

Electrical Equivalence Criteria:

• Resolution: 12 bits (must match exactly)
• Number of Inputs: 1 (must match exactly)
• Input Type: Single Ended (must match exactly)
• Data Interface: Parallel (must match exactly)
• Architecture: SAR (must match exactly)
• Reference Type: External, Internal (must match exactly)
• Analog Supply Voltage: 5V (must match exactly)
• Digital Supply Voltage: 5V (must match exactly)
• Operating Temperature Range: -40°C to 85°C (must match or exceed)

Mechanical Compatibility Considerations:

• Package type may differ (DIP to SOIC conversion requires PCB redesign or adapter solutions)
• Mounting type may differ (through-hole to surface-mount conversion requires assembly process changes)
• Pin count and pinout must be verified for direct compatibility

Performance Characteristics:

• Sampling rate may exceed the original specification (higher performance acceptable)
• Moisture Sensitivity Level may differ based on package type

Parameter Comparison

Engineering Selection Recommendations

The ADS8504IBDW is electrically equivalent to the ADS7804P across all critical functional parameters: 12-bit resolution, single-ended input, parallel data interface, SAR architecture, and 5V supply requirements. Both devices operate within the same temperature range and maintain ROHS3 compliance.

The primary difference is packaging: the ADS8504IBDW uses a 28-SOIC surface-mount package instead of the 28-DIP through-hole package of the ADS7804P. This substitution requires PCB redesign or the use of DIP-to-SOIC adapter solutions for direct replacement in existing through-hole designs.

The ADS8504IBDW offers improved performance with a 250 kHz sampling rate compared to the 100 kHz of the original part, making it suitable for applications requiring higher conversion speeds. The substitute part is currently in active production status, ensuring long-term availability and supply chain stability compared to the obsolete ADS7804P.

Frequently Asked Questions (FAQ)

Q: Can the ADS8504IBDW directly replace the ADS7804P in an existing PCB?

A: Direct replacement is not possible without PCB modification. The ADS7804P uses a 28-DIP through-hole package, while the ADS8504IBDW uses a 28-SOIC surface-mount package. A DIP-to-SOIC adapter or PCB redesign is required for physical integration.

Q: Are the electrical specifications identical between these two parts?

A: The core electrical specifications are equivalent: 12-bit resolution, 1 single-ended input, parallel data interface, SAR architecture, external and internal reference support, and 5V supply requirements. The ADS8504IBDW provides higher sampling rate performance (250 kHz vs. 100 kHz).

Q: What is the significance of the different Moisture Sensitivity Levels?

A: The ADS7804P has MSL 3 (168 hours), while the ADS8504IBDW has MSL 2 (1 year). Lower MSL values indicate better moisture resistance. The ADS8504IBDW's improved MSL rating reflects modern packaging standards and provides better protection during storage and handling.

Q: Why is the ADS7804P classified as obsolete?

A: The ADS7804P is an older design that has been superseded by newer alternatives like the ADS8504IBDW. Texas Instruments no longer manufactures the ADS7804P, making the ADS8504IBDW the recommended active product for new designs and legacy system updates.

Q: Are both parts RoHS compliant?

A: Yes, both the ADS7804P and ADS8504IBDW are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards.