DAC7545KU Equivalent & Substitute Parts

Part Overview

The DAC7545KU is a 12-bit digital-to-analog converter manufactured by Texas Instruments, housed in a 20-SOIC package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The DAC7545KU features an R-2R architecture with external reference capability, unbuffered current output, and parallel data interface, operating across -40°C to 85°C with supply voltages ranging from 5V to 15V.

Key Parameters

Parameter	Value
Resolution	12 Bits
Number of D/A Converters	1
Settling Time	2µs
Output Type	Current - Unbuffered
Data Interface	Parallel
Reference Type	External
Voltage - Supply, Analog	5V ~ 15V
Voltage - Supply, Digital	5V ~ 15V
INL/DNL (LSB)	±1 (Max) / ±1 (Max)
Architecture	R-2R
Operating Temperature	-40°C ~ 85°C
Package / Case	20-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)

Substitute Part Grouping Explanation

Substitute parts for the DAC7545KU are selected based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

12-bit resolution (mandatory)
Single D/A converter (mandatory)
Parallel data interface (mandatory)
External reference type (mandatory)
R-2R architecture (mandatory)
Unbuffered current output (mandatory)
20-pin SOIC package form factor (mandatory for direct PCB compatibility)
Surface mount technology (mandatory)
ROHS3 compliance (mandatory)

Substitute parts are grouped into two categories based on package configuration: tube packaging and tape & reel (TR) packaging. All listed substitutes maintain electrical compatibility within the specified parameter ranges while offering improved product status (active vs. obsolete) and enhanced performance characteristics in select parameters.

Parameter Comparison

Parameter	DAC7545KU	DAC7821IPW	LTC7545ABSW#PBF	MX7545AKEWP+	MX7545AKEWP+T	MX7545KCWP+	MX7545KCWP+T
Manufacturer	Texas Instruments	Texas Instruments	Analog Devices Inc.	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated
Resolution (Bits)	12	12	12	12	12	12	12
Number of D/A Converters	1	1	1	1	1	1	1
Settling Time	2µs	200ns	1µs	1µs	1µs	2µs	2µs
Output Type	Current - Unbuffered	Current - Unbuffered	Current - Unbuffered	Current - Unbuffered	Current - Unbuffered	Current - Unbuffered	Current - Unbuffered
Data Interface	Parallel	Parallel	Parallel	Parallel	Parallel	Parallel	Parallel
Reference Type	External	External	External	External	External	External	External
Voltage - Supply, Analog	5V ~ 15V	2.7V ~ 5.5V	5V, 14.25V ~ 15.75V	5V ~ 15V	5V ~ 15V	5V ~ 15V	5V ~ 15V
Voltage - Supply, Digital	5V ~ 15V	2.7V ~ 5.5V	5V, 14.25V ~ 15.75V	5V ~ 15V	5V ~ 15V	5V ~ 15V	5V ~ 15V
INL/DNL (LSB)	±1 / ±1	±1 / ±1	±0.5 / ±1	±0.5 / ±1	±0.5 / ±1	±1 / ±1	±1 / ±1
Architecture	R-2R	R-2R	R-2R	R-2R	R-2R	R-2R	R-2R
Operating Temperature	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	0°C ~ 70°C	0°C ~ 70°C
Package / Case	20-SOIC	20-TSSOP	20-SOIC	20-SOIC	20-SOIC	20-SOIC	20-SOIC
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	3 (168 Hours)	2 (1 Year)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

All substitute parts listed maintain active product status, ensuring long-term availability and manufacturing support compared to the obsolete DAC7545KU. Selection among substitutes depends on specific application requirements:

For applications requiring identical package geometry and thermal operating range (-40°C to 85°C), the LTC7545ABSW#PBF, MX7545AKEWP+, and MX7545AKEWP+T are direct functional equivalents. These parts offer improved INL accuracy (±0.5 LSB maximum) and superior moisture sensitivity ratings (MSL 1).

For applications with relaxed temperature requirements (0°C to 70°C), the MX7545KCWP+ and MX7545KCWP+T variants provide equivalent electrical performance with matching settling time characteristics.

The DAC7821IPW offers the fastest settling time (200ns) and extended operating temperature range (-40°C to 125°C) but operates at reduced supply voltages (2.7V to 5.5V) and uses a 20-TSSOP package, requiring PCB layout modification.

All substitutes maintain ROHS3 compliance and EAR99 export classification consistent with the original part.

Frequently Asked Questions (FAQ)

Q: Can DAC7821IPW directly replace DAC7545KU on existing PCBs?

A: No. While DAC7821IPW is electrically compatible, it uses a 20-TSSOP package versus the 20-SOIC package of DAC7545KU. PCB footprint modification is required. For direct PCB compatibility without layout changes, use LTC7545ABSW#PBF, MX7545AKEWP+, MX7545AKEWP+T, MX7545KCWP+, or MX7545KCWP+T.

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

A: Both parts are electrically identical. MX7545AKEWP+ is supplied in tube packaging, while MX7545AKEWP+T is supplied in tape & reel (TR) format. Selection depends on assembly process requirements and volume.

Q: Are MX7545KCWP+ and MX7545KCWP+T suitable for -40°C applications?

A: No. These variants operate from 0°C to 70°C. For applications requiring -40°C operation, use DAC7821IPW, LTC7545ABSW#PBF, MX7545AKEWP+, or MX7545AKEWP+T.

Q: What supply voltage range applies to LTC7545ABSW#PBF?

A: LTC7545ABSW#PBF operates at 5V or 14.25V to 15.75V. This differs from DAC7545KU, which accepts 5V to 15V continuously. Verify power supply design compatibility before substitution.

Q: Do all substitutes maintain the same INL/DNL specifications?

A: No. LTC7545ABSW#PBF, MX7545AKEWP+, and MX7545AKEWP+T offer improved INL accuracy (±0.5 LSB maximum) compared to DAC7545KU and MX7545KCWP+ variants (±1 LSB maximum). This represents enhanced linearity performance.

Q: What is the significance of MSL ratings in these parts?

A: MSL (Moisture Sensitivity Level) indicates storage and handling requirements. DAC7545KU requires MSL 3 precautions (168-hour limit). All active substitutes feature MSL 1 or MSL 2 ratings, allowing extended shelf life and reduced moisture-related failures during assembly.

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