MAX944ESD Equivalent & Substitute Parts

Part Overview

The MAX944ESD is a general-purpose CMOS comparator IC with four independent elements in a 14-SOIC surface-mount package, manufactured by Analog Devices Inc./Maxim Integrated. This device features push-pull and TTL-compatible outputs, making it suitable for signal comparison applications across a 2.7V to 5.5V supply range.

The MAX944ESD is classified as obsolete, which necessitates identification of equivalent and substitute parts for new designs or production continuity. Active alternatives with compatible electrical and mechanical specifications are available to maintain design functionality while ensuring ongoing component availability.

Substiute Parts

MAX944ESD

Analog Devices Inc./Maxim IntegratedIn Stock: 5916MAX944ESD Datasheet

Current PartRFQ

MAX944ESD+

Analog Devices Inc./Maxim IntegratedIn Stock: 980MAX944ESD+ Datasheet

DirectRFQ

LMV339IDR

Texas InstrumentsIn Stock: 35220LMV339IDR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MAX944ESD is determined by the following critical parameters:

• Package Compatibility: All substitute parts must use the 14-SOIC surface-mount package with identical 0.154" (3.90mm) width to ensure PCB footprint compatibility.
• Functional Equivalence: Four independent comparator elements are required to maintain circuit functionality.
• Supply Voltage Range: Operating range must encompass or match the 2.7V to 5.5V specification.
• Output Configuration: Output type must be compatible with the application's signal requirements.
• Electrical Performance: Input offset voltage, input bias current, and propagation delay must meet or exceed the original specifications to ensure system performance.
• Compliance Standards: RoHS3 compliance is mandatory for regulatory alignment.

Two substitute parts meet these criteria:

1. MAX944ESD+ (Direct Manufacturer Variant): Identical electrical specifications with active product status and tube packaging.
2. LMV339IDR (Manufacturer-Recommended Alternative): Texas Instruments equivalent with compatible package and supply voltage, featuring open-collector output configuration.

Parameter Comparison

Engineering Selection Recommendations

MAX944ESD+ (Direct Replacement)

The MAX944ESD+ is the primary substitute for the obsolete MAX944ESD. This part is manufactured by the same supplier (Analog Devices Inc./Maxim Integrated) and maintains identical electrical specifications, including input offset voltage, input bias current, quiescent current, and propagation delay. The MAX944ESD+ carries active product status, ensuring long-term availability and supply chain continuity. Both parts are ROHS3 compliant and carry identical compliance certifications (REACH Unaffected, EAR99 ECCN classification). The only difference is packaging format (tube versus unspecified original packaging) and inventory status. This part is recommended for direct substitution in existing designs without circuit modification.

LMV339IDR (Alternative Substitute)

The LMV339IDR from Texas Instruments is a manufacturer-recommended alternative that maintains package compatibility (14-SOIC) and supply voltage range (2.7V ~ 5.5V). This part features open-collector output configuration, which differs from the push-pull/TTL output of the MAX944ESD. The LMV339IDR exhibits higher input offset voltage (7mV versus 2mV), higher input bias current (0.25µA versus 0.15µA), and significantly longer propagation delay (600ns versus 80ns). However, it offers lower quiescent current (350µA versus 600µA) and an extended operating temperature range (-40°C ~ 125°C). The LMV339IDR is suitable for applications where output configuration flexibility and lower power consumption are acceptable trade-offs for reduced speed performance. Circuit design modifications may be required to accommodate the open-collector output topology.

Frequently Asked Questions (FAQ)

Q: Can MAX944ESD+ be used as a direct drop-in replacement for MAX944ESD?

A: Yes. The MAX944ESD+ is electrically and mechanically identical to the MAX944ESD. Both parts feature the same four-element comparator configuration, identical electrical specifications, and 14-SOIC surface-mount package. No circuit modifications are required. The primary difference is product status (active versus obsolete) and packaging format.

Q: What are the key differences between MAX944ESD and LMV339IDR?

A: The primary differences are output type (push-pull/TTL versus open-collector), input offset voltage (2mV versus 7mV), input bias current (0.15µA versus 0.25µA), and propagation delay (80ns versus 600ns). The LMV339IDR offers lower quiescent current and extended temperature range. Output configuration differences may require circuit design modifications.

Q: Is the LMV339IDR suitable for high-speed applications?

A: The LMV339IDR has a maximum propagation delay of 600ns, compared to 80ns for the MAX944ESD. For applications requiring fast signal comparison, the MAX944ESD+ is the preferred choice. The LMV339IDR is suitable for general-purpose comparator applications where speed is not a critical constraint.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. Both MAX944ESD+ and LMV339IDR are ROHS3 compliant and carry identical REACH and ECCN classifications (REACH Unaffected, EAR99). All parts meet current regulatory requirements for electronic component manufacturing and distribution.

Q: Can I use LMV339IDR in a design originally specified for MAX944ESD?

A: Substitution is possible but requires circuit evaluation. The open-collector output requires pull-up resistors, and the slower propagation delay may affect timing-sensitive circuits. Input offset voltage and bias current differences should be verified against application tolerances. Prototype testing is advisable before production implementation.

Q: What is the package footprint compatibility between these parts?

A: All three parts (MAX944ESD, MAX944ESD+, and LMV339IDR) use the 14-SOIC package with 0.154" (3.90mm) width. PCB footprints are identical, and parts are mechanically interchangeable without layout modifications.