DAC712U Equivalent & Substitute Parts

Part Overview

The DAC712U is a 16-bit Digital to Analog Converter manufactured by Texas Instruments, designed for voltage output applications in data acquisition systems. This component features a single D/A converter with internal reference, parallel data interface, and R-2R architecture. The DAC712U is classified as obsolete, making identification of suitable substitute components essential for ongoing system support and new design implementations.

Substiute Parts

DAC712U

Texas InstrumentsIn Stock: 2543DAC712U Datasheet

Current PartRFQ

DAC8734SRHAR

Texas InstrumentsIn Stock: 2354DAC8734SRHAR Datasheet

MFR RecommendedRFQ

DAC8734SRHAT

Texas InstrumentsIn Stock: 2230DAC8734SRHAT Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the DAC712U requires evaluation against the following critical parameters that define functional compatibility:

Resolution and Converter Count: The DAC712U provides 16-bit resolution with a single D/A converter. Substitute parts must maintain 16-bit resolution to preserve signal fidelity and system accuracy.

Output Architecture: The DAC712U uses R-2R architecture with buffered voltage output. Substitute parts must employ identical architecture and output type to ensure equivalent performance characteristics.

Data Interface: The DAC712U employs parallel data interface. Substitute parts identified maintain this interface requirement for direct integration compatibility.

Reference Configuration: The DAC712U features an internal reference. Substitute parts listed use external reference, which represents a functional difference requiring circuit design consideration.

Supply Voltage Requirements: The DAC712U operates on ±11.4V ~ 16.5V analog supply. Substitute parts operate on different supply ranges (4.75V ~ 24V, -4.75V ~ -18V), requiring power supply redesign.

Packaging: The DAC712U uses 28-SOIC surface mount package. Substitute parts use 40-VQFN package, requiring PCB layout modification.

The identified substitute parts (DAC8734SRHAR, DAC8734SRHAT) share core 16-bit resolution and R-2R architecture but introduce differences in converter count (4 vs. 1), data interface (SPI vs. Parallel), reference type (External vs. Internal), and physical packaging. These differences necessitate circuit redesign rather than direct pin-for-pin replacement.

Parameter Comparison

Engineering Selection Recommendations

The DAC712U is classified as obsolete, necessitating component substitution for new production or system maintenance. The identified substitute parts (DAC8734SRHAR and DAC8734SRHAT) are active products from the same manufacturer, ensuring continued availability and support.

Both substitute parts offer improved linearity performance (±1 LSB INL/DNL versus ±8 LSB for the DAC712U) and extended operating temperature range (-40°C ~ 105°C versus -40°C ~ 85°C). Both maintain ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements equivalent to the original component.

The DAC8734SRHAR and DAC8734SRHAT are functionally identical variants, differing only in packaging configuration (Tape & Reel). Selection between these two depends on procurement and assembly requirements rather than electrical performance.

Substitution requires circuit redesign due to differences in data interface (SPI versus Parallel), reference configuration (External versus Internal), supply voltage ranges, and physical packaging (40-VQFN versus 28-SOIC). These changes necessitate firmware modification, power supply redesign, and PCB layout revision.

Frequently Asked Questions (FAQ)

Q: Can DAC8734SRHAR or DAC8734SRHAT be used as direct pin-for-pin replacements for DAC712U?

A: No. The substitute parts differ in data interface (SPI versus Parallel), package type (40-VQFN versus 28-SOIC), and pin configuration. Direct substitution is not possible without circuit redesign.

Q: What are the key differences between DAC8734SRHAR and DAC8734SRHAT?

A: These parts are electrically identical 16-bit, 4-channel DACs with identical electrical specifications. The difference is packaging configuration: DAC8734SRHAR is supplied in Tape & Reel format, while DAC8734SRHAT is also supplied in Tape & Reel format. Both are suitable for automated assembly.

Q: Why do the substitute parts have four D/A converters instead of one?

A: The DAC8734 series is designed for multi-channel applications. Systems requiring only single-channel conversion can utilize one converter and leave remaining channels unused, or select alternative single-channel 16-bit DAC options from Texas Instruments.

Q: What is the impact of the different reference types (Internal versus External)?

A: The DAC712U uses an internal reference, simplifying circuit design. The DAC8734 series requires an external reference component, adding circuit complexity and component count but providing greater flexibility in reference voltage selection.

Q: Are the settling time differences significant?

A: The DAC712U settles in 6µs typical, while DAC8734 settles in 8µs typical. This 2µs difference is application-dependent. High-speed sampling applications may require evaluation of this parameter.

Q: What supply voltage changes are required?

A: The DAC712U operates on ±11.4V ~ 16.5V. The DAC8734 operates on 4.75V ~ 24V (analog) and 2.7V ~ 5.5V (digital). Power supply redesign is required for substitution.

Q: Do the substitute parts maintain compliance certifications?

A: Yes. Both DAC8734SRHAR and DAC8734SRHAT are ROHS3 compliant and REACH unaffected, matching the compliance status of the DAC712U.