DAC7801KUG4 Equivalent & Substitute Parts

Part Overview

The DAC7801KUG4 is a 12-bit digital-to-analog converter (DAC) manufactured by Texas Instruments, housed in a 24-SOIC surface mount package. This component features dual D/A converters with current output, external reference capability, and parallel data interface. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. Substitute parts must maintain electrical compatibility across key parameters including bit resolution, converter count, settling time, output characteristics, and supply voltage specifications.

Substiute Parts

DAC7801KUG4

Texas InstrumentsIn Stock: 25257DAC7801KUG4 Datasheet

Current PartRFQ

DAC7801KU

Burr BrownIn Stock: 2329DAC7801KU Datasheet

Parametric EquivalentRFQ

DAC7802KU

Texas InstrumentsIn Stock: 2359DAC7802KU Datasheet

Parametric EquivalentRFQ

AD5447YRUZ

Analog Devices Inc.In Stock: 1642AD5447YRUZ Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the DAC7801KUG4 are selected based on strict electrical and mechanical parameter matching. The primary substitution criteria are:

Critical Parameters for Substitution:

• 12-bit resolution
• Dual D/A converter configuration
• Current output, unbuffered topology
• Parallel data interface
• External reference capability
• 5V analog and digital supply voltage compatibility
• ±1 LSB INL/DNL specification
• Surface mount 24-pin package

Substitute Categories:

Parametric Equivalents maintain all critical electrical specifications and package form factor. DAC7801KU (Burr Brown) and DAC7802KU (Texas Instruments) are direct parametric equivalents with identical settling time (800ns), output characteristics, and supply voltage requirements. Both are housed in 24-SOIC packages and support the same operating temperature range.

Manufacturer Recommended Substitute AD5447YRUZ (Analog Devices Inc.) differs in package type (24-TSSOP vs. 24-SOIC) and offers enhanced performance characteristics including faster settling time (120ns) and wider supply voltage range (2.5V ~ 5.5V). This part maintains 12-bit resolution, dual converter configuration, and parallel interface compatibility but requires PCB layout modification due to package change.

Parameter Comparison

Engineering Selection Recommendations

For Direct Pin-Compatible Replacement: Select DAC7801KU or DAC7802KU when PCB layout and package footprint cannot be modified. Both parts are active products with ROHS3 compliance and maintain identical electrical specifications to the obsolete DAC7801KUG4. DAC7802KU is preferred as it is manufactured by Texas Instruments, the original DAC7801KUG4 manufacturer, ensuring consistent design heritage and support documentation.

For Performance Enhancement with Layout Modification: The AD5447YRUZ offers superior performance characteristics including 6.7x faster settling time (120ns vs. 800ns) and extended operating temperature range (-40°C ~ 125°C vs. -40°C ~ 85°C). This part requires PCB redesign due to 24-TSSOP package format versus 24-SOIC. The wider supply voltage range (2.5V ~ 5.5V) provides additional design flexibility. MSL rating of 1 (Unlimited) eliminates moisture sensitivity constraints. Selection of this part is appropriate for new designs or redesigns where performance improvement justifies layout modification.

Compliance Considerations: All substitute parts maintain ROHS3 compliance and EAR99 export classification. The DAC7802KU and AD5447YRUZ both carry ROHS3 certification matching the original part. Moisture sensitivity differs between options; designs with extended storage or humid environment exposure should prioritize the AD5447YRUZ (MSL 1) over alternatives with MSL 3 rating.

Frequently Asked Questions (FAQ)

Q: Can DAC7801KU be used as a direct replacement for DAC7801KUG4? A: Yes. DAC7801KU is a parametric equivalent with identical electrical specifications, settling time (800ns), output characteristics, and 24-SOIC package footprint. No PCB modifications are required.

Q: What is the difference between DAC7801KU and DAC7802KU? A: Both are parametric equivalents with identical electrical performance. DAC7802KU is manufactured by Texas Instruments (original DAC7801KUG4 manufacturer), while DAC7801KU is manufactured by Burr Brown. Selection between these parts depends on supply chain availability and manufacturer preference.

Q: Why does AD5447YRUZ have a different package type? A: AD5447YRUZ uses 24-TSSOP package instead of 24-SOIC. While both are 24-pin surface mount packages, TSSOP has a smaller footprint (0.173" width vs. 0.295" width). This package change requires PCB layout modification but enables faster settling time and improved thermal characteristics.

Q: Is AD5447YRUZ compatible with existing DAC7801KUG4 designs without modification? A: Electrical compatibility is maintained; however, PCB layout modification is required due to different package footprint. Pin functionality and signal interface remain compatible with proper layout adaptation.

Q: What is the significance of the MSL rating difference? A: DAC7801KUG4, DAC7801KU, and DAC7802KU have MSL 3 (168 hours), requiring controlled moisture exposure during storage and handling. AD5447YRUZ has MSL 1 (Unlimited), eliminating moisture sensitivity constraints and simplifying supply chain management.

Q: Can these parts operate at supply voltages other than 5V? A: DAC7801KUG4, DAC7801KU, and DAC7802KU require fixed 5V supply. AD5447YRUZ supports 2.5V ~ 5.5V supply range, providing flexibility for lower voltage applications.

Q: What is the settling time impact on system performance? A: DAC7801KUG4, DAC7801KU, and DAC7802KU settle in 800ns. AD5447YRUZ settles in 120ns, enabling 6.7x faster output transitions. This difference is significant for high-speed signal generation applications but may be irrelevant for low-frequency control applications.

Q: Are all substitute parts currently in production? A: DAC7801KU, DAC7802KU, and AD5447YRUZ are all active products. DAC7801KUG4 is obsolete, making substitutes necessary for new production.