DAC7821IPWR Equivalent & Substitute Parts

Part Overview

The DAC7821IPWR is a 12-bit digital-to-analog converter manufactured by Texas Instruments, housed in a 20-TSSOP surface mount package. This device converts parallel digital input signals to unbuffered current output with external voltage reference capability. The part is currently in active production status with 1994 units available in inventory.

Substitute parts are identified when equivalent electrical specifications and mechanical compatibility are maintained across the core functional parameters: bit resolution, number of converters, output type, data interface, package form factor, and operating temperature range.

Substiute Parts

DAC7821IPWR

Texas InstrumentsIn Stock: 2080DAC7821IPWR Datasheet

Current PartRFQ

AD5445YRUZ

Analog Devices Inc.In Stock: 1737AD5445YRUZ Datasheet

MFR RecommendedRFQ

AD5445YRUZ-REEL7

Analog Devices Inc.In Stock: 4364AD5445YRUZ-REEL7 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the DAC7821IPWR are qualified based on the following criteria:

Electrical Equivalence Requirements:

• 12-bit resolution maintained
• Single D/A converter configuration
• Current output, unbuffered topology
• Differential output capability
• Parallel data interface
• External reference input
• R-2R architecture
• Operating temperature range: -40°C to 125°C

Mechanical Compatibility Requirements:

• 20-TSSOP package form factor
• Surface mount mounting type
• 0.173" (4.40mm) package width

Compliance Requirements:

• ROHS3 compliance
• REACH unaffected status
• EAR99 export classification

The AD5445YRUZ and AD5445YRUZ-REEL7 from Analog Devices Inc. meet all substitution criteria. Both variants share identical electrical specifications and package geometry, differing only in packaging format (Tube versus Cut Tape & Digi-Reel).

Parameter Comparison

Engineering Selection Recommendations

Both AD5445YRUZ variants qualify as direct electrical and mechanical substitutes for the DAC7821IPWR. Selection between substitute options depends on procurement and supply chain requirements:

AD5445YRUZ (Tube Packaging): Suitable for standard component procurement workflows where tube packaging is the default distribution format.

AD5445YRUZ-REEL7 (Cut Tape & Digi-Reel): Appropriate for high-volume automated assembly operations requiring reel-based component feeding. This variant offers higher inventory availability (4256 units) compared to the tube variant (1627 units).

All three parts maintain ROHS3 compliance and REACH unaffected status. The AD5445 variants demonstrate improved settling time performance (120ns versus 200ns) and superior moisture sensitivity rating (MSL 1 Unlimited versus MSL 2 1-Year), representing enhanced reliability characteristics in the substitute options.

Frequently Asked Questions (FAQ)

Q: Can AD5445YRUZ be used as a direct replacement for DAC7821IPWR in existing designs?

A: Yes. Both devices share identical 12-bit resolution, single converter configuration, current output topology, parallel interface, and 20-TSSOP package geometry. The electrical specifications and mechanical compatibility support direct substitution without circuit redesign.

Q: What is the difference between AD5445YRUZ and AD5445YRUZ-REEL7?

A: The devices are electrically identical. The difference is packaging format: AD5445YRUZ is supplied in Tube packaging, while AD5445YRUZ-REEL7 is supplied in Cut Tape with Digi-Reel format. Selection depends on assembly process requirements and component feeding methodology.

Q: Are there supply voltage compatibility concerns when substituting?

A: The DAC7821IPWR supports analog and digital supply voltages from 2.7V to 5.5V. The AD5445 variants support 2.5V to 5.5V. The AD5445 lower minimum voltage specification (2.5V) is compatible with all DAC7821IPWR applications. Designs operating at 2.5V supply voltage cannot use the DAC7821IPWR but can use AD5445 variants.

Q: How do settling time differences affect circuit performance?

A: The AD5445 variants settle in 120ns compared to the DAC7821IPWR's 200ns. This represents improved transient response. Applications with timing-critical signal acquisition may benefit from the faster settling characteristic, but existing designs do not require modification to accommodate the faster substitute.

Q: What is the significance of the MSL rating difference?

A: The DAC7821IPWR carries MSL 2 (1-Year storage limit under controlled humidity). The AD5445 variants carry MSL 1 (Unlimited storage). MSL 1 provides greater flexibility in component storage and handling without moisture bake-out requirements, reducing logistics complexity for inventory management.

Q: Are there any DNL specification differences to consider?

A: The DAC7821IPWR specifies DNL at ±1 LSB maximum. The AD5445 variants specify DNL at -1/+2 LSB maximum. This asymmetric specification in the substitute parts represents a minor deviation but remains within acceptable linearity performance for 12-bit DAC applications.