MAX944CPD Equivalent & Substitute Parts

Part Overview

The MAX944CPD is a general-purpose CMOS comparator with four independent elements, designed for signal comparison applications requiring push-pull TTL-compatible outputs. Manufactured by Analog Devices Inc./Maxim Integrated, this device operates across a 2.7V to 5.5V supply range with a maximum propagation delay of 80ns. The MAX944CPD is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations.

Key Parameters

Parameter	MAX944CPD
Manufacturer	Analog Devices Inc./Maxim Integrated
Number of Elements	4
Output Type	CMOS, Push-Pull, TTL
Voltage - Supply, Single/Dual (±)	2.7V ~ 5.5V
Voltage - Input Offset (Max)	2mV @ 5.5V
Current - Input Bias (Max)	0.15µA @ 5.5V
Current - Quiescent (Max)	600µA
Propagation Delay (Max)	80ns
Operating Temperature	0°C ~ 70°C
Package / Case	14-DIP (0.300", 7.62mm)
Mounting Type	Through Hole
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the MAX944CPD is determined by the following critical parameters:

Functional Equivalence: Four independent comparator elements with CMOS and TTL-compatible push-pull outputs
Supply Voltage Compatibility: Operating range must encompass or exceed the 2.7V to 5.5V specification
Electrical Performance: Propagation delay, input offset voltage, and quiescent current must meet or exceed the original specifications
Package Compatibility: Physical form factor and pin configuration must support direct replacement or board-level integration
Compliance Status: RoHS3 compliance and REACH unaffected status required for regulatory alignment

The MCP6564-E/SL qualifies as a substitute based on matching element count, output type configuration, overlapping supply voltage range, equivalent propagation delay, and identical compliance certifications.

Parameter Comparison

Parameter	MAX944CPD	MCP6564-E/SL	Compatibility Notes
Number of Elements	4	4	Functionally equivalent
Output Type	CMOS, Push-Pull, TTL	CMOS, Push-Pull, Rail-to-Rail, TTL	MCP6564-E/SL includes rail-to-rail capability
Voltage - Supply, Single/Dual (±)	2.7V ~ 5.5V	1.8V ~ 5.5V	MCP6564-E/SL supports extended lower voltage range
Voltage - Input Offset (Max)	2mV @ 5.5V	10mV @ 5.5V	MAX944CPD has tighter offset specification
Current - Input Bias (Max)	0.15µA @ 5.5V	1pA @ 5.5V	MCP6564-E/SL has significantly lower input bias current
Current - Quiescent (Max)	600µA	130µA	MCP6564-E/SL offers lower power consumption
Propagation Delay (Max)	80ns	80ns	Electrically equivalent
Operating Temperature	0°C ~ 70°C	-40°C ~ 125°C	MCP6564-E/SL supports extended temperature range
Package / Case	14-DIP (0.300", 7.62mm)	14-SOIC (0.154", 3.90mm Width)	Different form factors; board redesign required
Mounting Type	Through Hole	Surface Mount	Different assembly process required
Product Status	Obsolete	Active	MCP6564-E/SL actively manufactured and supported
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Both meet regulatory requirements

Engineering Selection Recommendations

The MCP6564-E/SL is the manufacturer-recommended substitute for the obsolete MAX944CPD. Both devices maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment for new implementations and legacy system support.

The MCP6564-E/SL demonstrates superior electrical characteristics in several areas: input bias current is reduced from 0.15µA to 1pA, quiescent current decreases from 600µA to 130µA, and the operating temperature range expands from 0°C–70°C to -40°C–125°C. The propagation delay remains equivalent at 80ns maximum.

The primary consideration for substitution is the package transition from 14-DIP through-hole to 14-SOIC surface-mount. This change necessitates board-level redesign and assembly process modification. The input offset voltage specification widens from 2mV to 10mV on the MCP6564-E/SL; applications requiring the tighter offset tolerance of the MAX944CPD must evaluate this parameter against system requirements.

Frequently Asked Questions (FAQ)

Q: Can the MCP6564-E/SL directly replace the MAX944CPD in existing PCB designs?

A: Direct pin-for-pin replacement is not possible due to package differences. The MAX944CPD uses a 14-DIP through-hole package, while the MCP6564-E/SL uses a 14-SOIC surface-mount package. PCB redesign and component placement modification are required.

Q: What are the key electrical differences between these devices?

A: Both devices provide four comparator elements with 80ns maximum propagation delay and TTL-compatible outputs. The MCP6564-E/SL offers lower input bias current (1pA vs. 0.15µA), reduced quiescent current (130µA vs. 600µA), and an extended operating temperature range (-40°C to 125°C vs. 0°C to 70°C). The MAX944CPD maintains a tighter input offset voltage specification (2mV vs. 10mV).

Q: Is the MCP6564-E/SL suitable for applications requiring the MAX944CPD's 2mV input offset specification?

A: The MCP6564-E/SL has a maximum input offset of 10mV at 5.5V. Applications with strict offset voltage requirements below 10mV must evaluate whether this specification change affects system performance or requires alternative component selection.

Q: Are both devices compliant with current regulatory standards?

A: Yes. Both the MAX944CPD and MCP6564-E/SL are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements for electronic component manufacturing and use.

Q: What is the supply voltage compatibility between these devices?

A: The MAX944CPD operates from 2.7V to 5.5V. The MCP6564-E/SL extends the lower supply limit to 1.8V while maintaining the 5.5V upper limit. Both devices are compatible within the 2.7V to 5.5V range.

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