MAX944EPD+ Equivalent & Substitute Parts

Part Overview

The MAX944EPD+ is a general-purpose CMOS comparator IC manufactured by Analog Devices Inc./Maxim Integrated, featuring four independent comparator elements in a 14-pin DIP package. This device is designed for applications requiring precision voltage comparison with TTL-compatible push-pull outputs. The MAX944EPD+ is classified as obsolete, making identification of functionally equivalent substitute parts essential for ongoing system support, design updates, and procurement continuity.

Substiute Parts

MAX944EPD+

Analog Devices Inc./Maxim IntegratedIn Stock: 872MAX944EPD+ Datasheet

Current PartRFQ

MCP6564-E/SL

Microchip TechnologyIn Stock: 2199MCP6564-E/SL Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MAX944EPD+ is determined by the following critical parameters:

Functional Equivalence Criteria:

• Number of comparator elements: 4 independent channels required
• Output type: CMOS, Push-Pull, TTL compatibility mandatory
• Supply voltage range: Minimum 2.7V ~ 5.5V compatibility
• Propagation delay: Maximum 80ns specification
• Input offset voltage: Maximum 2mV specification
• Input bias current: Maximum 0.15µA specification

Compatibility Considerations:

• Package type change from 14-DIP (through-hole) to 14-SOIC (surface-mount) requires PCB redesign
• Operating temperature range expansion from -40°C ~ 85°C to -40°C ~ 125°C provides enhanced thermal margin
• Quiescent current reduction from 600µA to 130µA improves power efficiency
• Rail-to-rail output capability in substitute provides extended output swing

The MCP6564-E/SL meets all functional equivalence criteria while offering improved performance characteristics and active product status.

Parameter Comparison

Engineering Selection Recommendations

The MCP6564-E/SL is a functionally equivalent substitute for the MAX944EPD+ based on the following engineering criteria:

Functional Compatibility: Both devices provide four independent general-purpose comparators with identical element count, TTL-compatible push-pull outputs, and matching 80ns propagation delay specifications. The MCP6564-E/SL maintains the critical 2.7V ~ 5.5V supply voltage compatibility window required by the MAX944EPD+.

Product Status & Support: The MCP6564-E/SL holds active product status with ongoing manufacturer support, whereas the MAX944EPD+ is obsolete. This substitution ensures long-term component availability and access to current technical documentation.

Compliance & Certification: Both devices maintain ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements for equivalent applications.

Performance Trade-offs: The MCP6564-E/SL exhibits a higher input offset voltage specification (10mV versus 2mV), which may impact precision-critical applications. However, the substitute provides superior input bias current performance (1pA versus 0.15µA) and significantly reduced quiescent current consumption (130µA versus 600µA).

Package Consideration: Substitution requires PCB redesign due to package change from 14-DIP through-hole to 14-SOIC surface-mount technology. This transition is necessary for component procurement but demands layout modification.

Frequently Asked Questions (FAQ)

Q: Can the MCP6564-E/SL directly replace the MAX944EPD+ without PCB modification?

A: No. The MCP6564-E/SL uses 14-SOIC surface-mount packaging, while the MAX944EPD+ uses 14-DIP through-hole packaging. PCB redesign is required. However, pin-to-pin functional compatibility is maintained for all four comparator channels.

Q: What is the impact of the higher input offset voltage in the MCP6564-E/SL?

A: The MCP6564-E/SL specifies 10mV maximum input offset versus 2mV for the MAX944EPD+. Applications requiring input offset voltage below 10mV must evaluate circuit-level compensation or alternative parts. For general-purpose comparator applications, this difference is typically acceptable.

Q: Are the supply voltage ranges compatible?

A: Yes. The MCP6564-E/SL supply range (1.8V ~ 5.5V) encompasses the MAX944EPD+ requirement (2.7V ~ 5.5V). Systems designed for 2.7V ~ 5.5V operation are fully compatible.

Q: Does the extended operating temperature range of the MCP6564-E/SL affect substitution?

A: No. The MCP6564-E/SL operating range (-40°C ~ 125°C) exceeds the MAX944EPD+ specification (-40°C ~ 85°C). This provides enhanced thermal margin and is not a limiting factor for substitution.

Q: What are the implications of the reduced quiescent current in the MCP6564-E/SL?

A: The MCP6564-E/SL quiescent current (130µA) is significantly lower than the MAX944EPD+ (600µA). This reduction improves power efficiency and reduces thermal dissipation, providing a performance advantage for battery-powered or thermally constrained applications.

Q: Is the rail-to-rail output capability of the MCP6564-E/SL a compatibility concern?

A: No. Rail-to-rail output is an enhancement that extends output swing capability. Existing circuits designed for standard push-pull TTL outputs will operate correctly with the enhanced output range.

Q: Are there any compliance or certification differences between these parts?

A: Both devices maintain ROHS3 compliance and REACH unaffected status. No compliance barriers exist for substitution in regulated applications.