DAC7545KUG4 Equivalent & Substitute Parts

Part Overview

The DAC7545KUG4 is a 12-bit digital-to-analog converter manufactured by Texas Instruments, housed in a 20-SOIC package. This component features an R-2R architecture with unbuffered current output, external reference configuration, and parallel data interface. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new design implementations. Substitute parts must maintain functional compatibility across resolution, output type, data interface, and package form factor while accommodating supply voltage and thermal operating ranges.

Substiute Parts

DAC7545KUG4

Texas InstrumentsIn Stock: 783DAC7545KUG4 Datasheet

Current PartRFQ

DAC7821IPW

Texas InstrumentsIn Stock: 1505DAC7821IPW Datasheet

MFR RecommendedRFQ

LTC7545ABSW#PBF

Analog Devices Inc.In Stock: 1525LTC7545ABSW#PBF Datasheet

MFR RecommendedRFQ

MX7545AKEWP+

Analog Devices Inc./Maxim IntegratedIn Stock: 864MX7545AKEWP+ Datasheet

MFR RecommendedRFQ

MX7545AKEWP+T

Analog Devices Inc./Maxim IntegratedIn Stock: 3293MX7545AKEWP+T Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following critical parameters:

• Resolution and Converter Count: All substitute parts must provide 12-bit resolution with 1 D/A converter
• Output Configuration: Current-unbuffered output type with external reference requirement
• Data Interface: Parallel interface for digital input
• Architecture: R-2R topology
• Package Compatibility: Physical form factor and pin count (20-pin packages)
• Supply Voltage Range: Analog and digital supply voltage compatibility with original specification
• Thermal Range: Operating temperature range must encompass or match the original -40°C ~ 85°C specification
• Compliance: RoHS3 compliance and surface mount capability

The substitute parts are grouped into two categories based on package type: 20-SOIC variants (DAC7821IPW uses 20-TSSOP; LTC7545ABSW#PBF, MX7545AKEWP+, and MX7545AKEWP+T use 20-SOIC) and supply voltage operating ranges.

Parameter Comparison

Engineering Selection Recommendations

DAC7821IPW (Texas Instruments, 20-TSSOP): This part maintains Texas Instruments manufacturing continuity and offers improved settling time (200ns vs. 2µs). However, the supply voltage range is restricted to 2.7V ~ 5.5V, which does not accommodate the original 15V upper limit. The package change from 20-SOIC to 20-TSSOP requires PCB layout modification. Differential output capability is present but not required for single-ended applications. Product status is active with improved moisture sensitivity (MSL 2).

LTC7545ABSW#PBF (Analog Devices Inc., 20-SOIC): This part maintains the original 20-SOIC package form factor, eliminating layout redesign. Supply voltage specification is 5V with 14.25V ~ 15.75V range, which aligns with the original 5V ~ 15V specification. Settling time is 1µs, faster than the original 2µs. INL specification is improved to ±0.5 LSB. Product status is active with superior moisture sensitivity (MSL 1, unlimited). Operating temperature range matches the original specification.

MX7545AKEWP+ and MX7545AKEWP+T (Analog Devices Inc./Maxim Integrated, 20-SOIC): Both variants maintain the original 20-SOIC package and 5V ~ 15V supply voltage range. Settling time is 1µs with improved INL (±0.5 LSB). Operating temperature range matches the original specification. The primary distinction is packaging: MX7545AKEWP+ is supplied in tube format, while MX7545AKEWP+T is supplied in tape and reel format. Both have active product status and MSL 1 rating. Inventory availability is higher for the tape and reel variant (3200 pcs vs. 784 pcs).

For applications requiring the original supply voltage range (5V ~ 15V) and package form factor (20-SOIC), the LTC7545ABSW#PBF, MX7545AKEWP+, or MX7545AKEWP+T are direct substitutes. For applications tolerant of reduced supply voltage range (2.7V ~ 5.5V) and package redesign, DAC7821IPW offers enhanced performance.

Frequently Asked Questions (FAQ)

Q: Can DAC7821IPW replace DAC7545KUG4 in existing designs?

A: DAC7821IPW is functionally compatible for 12-bit DAC applications with parallel interface and external reference. However, the supply voltage range limitation (2.7V ~ 5.5V vs. 5V ~ 15V) and package change (20-TSSOP vs. 20-SOIC) require design verification. If the original design operates at supply voltages above 5.5V, this substitute is not suitable without circuit modification.

Q: What is the difference between MX7545AKEWP+ and MX7545AKEWP+T?

A: Both parts are electrically identical with matching specifications. The difference is packaging format: MX7545AKEWP+ is supplied in tube packaging, while MX7545AKEWP+T is supplied in tape and reel format. Tape and reel format is standard for automated assembly processes and offers higher inventory availability (3200 pcs vs. 784 pcs).

Q: Are all substitute parts RoHS3 compliant?

A: Yes, all substitute parts listed (DAC7821IPW, LTC7545ABSW#PBF, MX7545AKEWP+, MX7545AKEWP+T) are ROHS3 compliant, matching the original DAC7545KUG4 compliance status.

Q: Which substitute offers the best settling time performance?

A: DAC7821IPW provides the fastest settling time at 200ns, compared to 2µs for the original DAC7545KUG4 and 1µs for LTC7545ABSW#PBF and Maxim variants. However, this performance advantage must be weighed against supply voltage range and package compatibility constraints.

Q: Can I use LTC7545ABSW#PBF as a direct drop-in replacement?

A: LTC7545ABSW#PBF maintains the 20-SOIC package and 5V ~ 15V supply voltage range, making it suitable for direct PCB substitution without layout modification. Electrical performance is improved with faster settling time (1µs) and better INL specification (±0.5 LSB). Functional compatibility is confirmed across all critical parameters.

Q: What is the moisture sensitivity implication for long-term storage?

A: The original DAC7545KUG4 has MSL 3 rating (168-hour shelf life limit). All substitute parts offer improved moisture sensitivity: DAC7821IPW is MSL 2 (1-year limit), while LTC7545ABSW#PBF and Maxim variants are MSL 1 (unlimited). This represents improved handling and storage flexibility for substitute parts.

Q: Are there pin-to-pin compatibility differences between substitute parts?

A: DAC7821IPW uses a different package (20-TSSOP vs. 20-SOIC), requiring PCB redesign. LTC7545ABSW#PBF, MX7545AKEWP+, and MX7545AKEWP+T all use 20-SOIC packages with identical pin configurations, enabling direct substitution without layout changes.