MAX944CSD Equivalent & Substitute Parts

Part Overview

The MAX944CSD is a general-purpose CMOS comparator with four independent elements, designed for applications requiring low-power signal comparison and TTL-compatible output. Manufactured by Analog Devices Inc./Maxim Integrated, this 14-SOIC surface-mount device operates across a 2.7V to 5.5V supply range with a maximum propagation delay of 80ns.

The MAX944CSD is classified as obsolete, making it necessary to identify equivalent and substitute parts for new designs and ongoing production requirements. Active alternatives with identical or enhanced electrical characteristics are available to ensure design continuity and supply chain reliability.

Substiute Parts

MAX944CSD

Analog Devices Inc./Maxim IntegratedIn Stock: 5552MAX944CSD Datasheet

Current PartRFQ

MAX944CSD+

Analog Devices Inc./Maxim IntegratedIn Stock: 805MAX944CSD+ Datasheet

DirectRFQ

MCP6564T-E/ST

Microchip TechnologyIn Stock: 3680MCP6564T-E/ST Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the MAX944CSD is determined by the following critical parameters:

• Functional equivalence: Four independent general-purpose comparator elements
• Output compatibility: CMOS, Push-Pull, TTL output configuration
• Supply voltage range: Minimum 2.7V operation required
• Propagation delay: Maximum 80ns specification
• Package compatibility: 14-pin surface-mount configuration
• Electrical performance: Input offset voltage, input bias current, and quiescent current within acceptable tolerances

Two substitute parts meet these criteria:

1. MAX944CSD+ (Direct Manufacturer Upgrade): Same base product with active status and improved RoHS compliance
2. MCP6564T-E/ST (Manufacturer-Recommended Alternative): Enhanced specifications with extended temperature range and improved power efficiency

Parameter Comparison

Engineering Selection Recommendations

MAX944CSD+ (Direct Upgrade)

The MAX944CSD+ is the primary substitute for the obsolete MAX944CSD. It maintains identical electrical specifications and package configuration while offering active product status and ROHS3 compliance. This part is suitable for direct replacement in existing designs without circuit modifications. The MAX944CSD+ is recommended for applications where the original 14-SOIC package footprint and electrical performance are required.

MCP6564T-E/ST (Enhanced Alternative)

The MCP6564T-E/ST is a manufacturer-recommended alternative offering enhanced specifications including extended operating temperature range (-40°C to 125°C), significantly reduced quiescent current (130µA versus 600µA), and superior input bias current performance (1pA versus 0.15µA). This part includes rail-to-rail output capability and ROHS3 compliance.

The MCP6564T-E/ST requires PCB layout modification due to package change from 14-SOIC to 14-TSSOP. The slightly wider package (4.40mm versus 3.90mm) must be verified against board constraints. This alternative is suitable for new designs prioritizing power efficiency and extended temperature operation.

Both substitutes maintain the 80ns maximum propagation delay and four-element comparator configuration, ensuring functional compatibility with the original MAX944CSD specification.

Frequently Asked Questions (FAQ)

Q: Can MAX944CSD+ be used as a direct replacement for MAX944CSD?

A: Yes. The MAX944CSD+ is electrically and mechanically identical to the MAX944CSD, with the same 14-SOIC package, supply voltage range (2.7V ~ 5.5V), and propagation delay (80ns). No circuit modifications are required. The primary difference is active product status and improved RoHS compliance.

Q: What are the key differences between MAX944CSD+ and MCP6564T-E/ST?

A: The MAX944CSD+ maintains the original 14-SOIC package and specifications. The MCP6564T-E/ST offers enhanced performance with reduced quiescent current (130µA versus 600µA), extended temperature range (-40°C to 125°C versus 0°C to 70°C), and superior input bias current (1pA versus 0.15µA). However, the MCP6564T-E/ST uses a 14-TSSOP package requiring PCB layout changes.

Q: Is the MCP6564T-E/ST compatible with the original MAX944CSD footprint?

A: No. The MCP6564T-E/ST uses a 14-TSSOP package (4.40mm width) instead of the 14-SOIC package (3.90mm width) of the MAX944CSD. PCB layout modification is required for this substitution. Verify package dimensions against available board space before selection.

Q: What is the minimum supply voltage for each part?

A: MAX944CSD and MAX944CSD+ require minimum 2.7V supply voltage. The MCP6564T-E/ST operates at lower voltages with a minimum of 1.8V, providing additional flexibility for low-voltage applications.

Q: Are all three parts RoHS compliant?

A: The MAX944CSD is RoHS non-compliant. Both MAX944CSD+ and MCP6564T-E/ST are ROHS3 compliant, meeting current environmental and regulatory requirements.

Q: Which part should be selected for new designs?

A: For new designs, select based on application requirements. Use MAX944CSD+ for direct compatibility with existing 14-SOIC layouts. Use MCP6564T-E/ST for applications requiring extended temperature range, reduced power consumption, or lower supply voltage operation, accepting the package change requirement.