MAX7645BCWP+ Equivalent & Substitute Parts

Part Overview

The MAX7645BCWP+ is a 12-bit digital-to-analog converter (DAC) manufactured by Analog Devices Inc./Maxim Integrated, housed in a 20-SOIC surface mount package. This component features an unbuffered current output, parallel data interface, and external reference configuration. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	MAX7645BCWP+
Number of Bits	12
Number of D/A Converters	1
Settling Time	1µs
Output Type	Current - Unbuffered
Data Interface	Parallel
Reference Type	External
Voltage - Supply, Analog	14.25V ~ 15.75V
Voltage - Supply, Digital	14.25V ~ 15.75V
INL/DNL (LSB)	±1 (Max), ±1 (Max)
Architecture	R-2R
Operating Temperature	0°C ~ 70°C
Package / Case	20-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the MAX7645BCWP+ is determined by the following critical parameters:

Resolution: 12-bit conversion capability
Output Configuration: Current-mode unbuffered output
Data Interface: Parallel input
Reference Input: External reference requirement
Package: 20-SOIC form factor
Supply Voltage Range: Compatibility with 14.25V ~ 15.75V dual supply or 5V single supply operation
Settling Time: 1µs performance specification
Architecture: R-2R ladder topology

Substitute parts are grouped into two categories based on supply voltage compatibility:

Category 1 - Dual Supply (14.25V ~ 15.75V) Compatible: AD7545AKRZ, AD7545AKRZ-REEL, AD7545AKRZ-REEL7, LTC7545ABSW#PBF, LTC7545ABSW#TRPBF, LTC7545ACSW#PBF, LTC7545ACSW#TRPBF, LTC7545AKSW#PBF

Category 2 - Single Supply (5V) Only: AD7945BRZ, AD7945BRZ-REEL

Parameter Comparison

Parameter	MAX7645BCWP+	AD7545AKRZ	AD7545AKRZ-REEL7	AD7945BRZ	LTC7545ABSW#PBF	LTC7545ACSW#PBF	LTC7545AKSW#PBF
Number of Bits	12	12	12	12	12	12	12
Number of D/A Converters	1	1	1	1	1	1	1
Settling Time	1µs	1µs	1µs	600µs (Typ)	1µs	1µs	1µs
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	14.25V ~ 15.75V	5V ~ 15V	5V ~ 15V	5V	5V, 14.25V ~ 15.75V	5V, 14.25V ~ 15.75V	5V, 14.25V ~ 15.75V
Voltage - Supply, Digital	14.25V ~ 15.75V	5V ~ 15V	5V ~ 15V	5V	5V, 14.25V ~ 15.75V	5V, 14.25V ~ 15.75V	5V, 14.25V ~ 15.75V
INL/DNL (LSB)	±1, ±1	±0.5, ±1	±0.5, ±1	±0.5, ±0.5	±0.5, ±1	±0.5, ±0.5	±0.5, ±1
Architecture	R-2R	R-2R	R-2R	R-2R	R-2R	R-2R	R-2R
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	0°C ~ 70°C
Package / Case	20-SOIC	20-SOIC	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
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Obsolete	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Primary Substitutes (Recommended for Dual Supply Applications):

For designs operating at 14.25V ~ 15.75V dual supply, the AD7545AKRZ series and LTC7545 series provide direct functional equivalence with active product status. AD7545AKRZ and AD7545AKRZ-REEL7 offer improved INL/DNL specifications (±0.5 LSB INL) compared to the original part. LTC7545ACSW#PBF and LTC7545ACSW#TRPBF provide the tightest INL/DNL tolerance (±0.5 LSB both parameters) with extended temperature range (-40°C ~ 85°C), supporting both 5V and dual supply operation.

Secondary Substitutes (For 5V Single Supply Designs):

AD7945BRZ and AD7945BRZ-REEL are suitable only for applications requiring 5V single supply operation. These parts feature improved INL/DNL specifications (±0.5 LSB both parameters) and extended operating temperature range (-40°C ~ 85°C). However, settling time is degraded to 600µs typical, making them unsuitable for applications requiring 1µs settling performance.

Packaging Considerations:

All substitute parts maintain 20-SOIC surface mount packaging. Tape & Reel (TR) variants (AD7545AKRZ-REEL, AD7545AKRZ-REEL7, LTC7545ABSW#TRPBF, LTC7545ACSW#TRPBF) are available for high-volume production. Tube packaging variants are available for lower-volume requirements.

Compliance:

All substitute parts are ROHS3 compliant, REACH unaffected, and classified as EAR99 for export control purposes. Moisture sensitivity level remains at MSL 1 (unlimited shelf life).

Frequently Asked Questions (FAQ)

Q: Can AD7945BRZ replace MAX7645BCWP+ in all applications?

A: No. AD7945BRZ operates only at 5V single supply, whereas MAX7645BCWP+ requires 14.25V ~ 15.75V dual supply. Additionally, AD7945BRZ settling time is 600µs typical versus 1µs for the original part. Use AD7945BRZ only in new 5V designs where settling time requirements permit.

Q: What is the difference between AD7545AKRZ and AD7545AKRZ-REEL7?

A: Both parts are electrically identical. AD7545AKRZ is supplied in tube packaging for lower-volume applications. AD7545AKRZ-REEL7 is supplied in tape and reel format for automated assembly and high-volume production.

Q: Are LTC7545 parts pin-compatible with MAX7645BCWP+?

A: Yes. All substitute parts maintain identical 20-SOIC pinout and parallel data interface configuration. PCB layout modifications are not required for substitution.

Q: Which substitute offers the best INL/DNL performance?

A: LTC7545ACSW#PBF and LTC7545ACSW#TRPBF provide the tightest specifications at ±0.5 LSB for both INL and DNL, compared to ±1 LSB for the original MAX7645BCWP+.

Q: Can I use a substitute part rated for -40°C ~ 85°C in a 0°C ~ 70°C application?

A: Yes. Parts with extended temperature ratings (-40°C ~ 85°C) are fully compatible with narrower temperature ranges. Verify that your application does not require the specific temperature derating characteristics of the original part.

Q: What supply voltage range should I use for LTC7545ABSW#PBF?

A: LTC7545ABSW#PBF supports both 5V single supply and 14.25V ~ 15.75V dual supply operation. Select the supply configuration that matches your system architecture.

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