MAX981EPA Equivalent & Substitute Parts

Part Overview

The MAX981EPA is a comparator integrated circuit with integrated voltage reference, manufactured by Analog Devices Inc./Maxim Integrated. This device features a single comparator element with 50mV hysteresis and operates across a supply voltage range of 2.5V to 11V (single supply) or ±1.25V to ±5.5V (dual supply). The MAX981EPA is classified as obsolete, making identification of functionally equivalent active alternatives essential for new designs and production continuity.

Substiute Parts

MAX981EPA

Analog Devices Inc./Maxim IntegratedIn Stock: 884MAX981EPA Datasheet

Current PartRFQ

LTC1440CN8#PBF

Analog Devices Inc.In Stock: 943LTC1440CN8#PBF Datasheet

MFR RecommendedRFQ

LTC1440IN8#PBF

Analog Devices Inc.In Stock: 1006LTC1440IN8#PBF Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MAX981EPA is determined by the following critical parameters:

• Functional Type: Single comparator with integrated voltage reference
• Package Compatibility: 8-DIP (0.300", 7.62mm) through-hole mounting
• Supply Voltage Range: Minimum coverage of 2.5V to 11V single supply or equivalent dual supply range
• Input Offset Voltage: Maximum 10mV @ 5V
• Hysteresis: 50mV
• CMRR/PSRR Performance: 80dB minimum
• Operating Temperature: Support for -40°C to 85°C range
• Regulatory Compliance: ROHS3 compliant, REACH unaffected

The LTC1440CN8#PBF and LTC1440IN8#PBF meet these substitution criteria as active-status alternatives from Analog Devices Inc. Both devices maintain identical package form factor, hysteresis specification, and core electrical performance metrics while offering enhanced output drive capability and extended product lifecycle support.

Parameter Comparison

Engineering Selection Recommendations

LTC1440IN8#PBF is the primary substitute for MAX981EPA applications requiring full temperature range operation (-40°C to 85°C). This device maintains identical operating temperature specifications to the original part while offering active product status, ensuring long-term availability and manufacturing support. The LTC1440IN8#PBF provides CMOS/TTL output capability with 40mA typical output current, enhancing drive capability for downstream logic circuits.

LTC1440CN8#PBF serves as an alternative for applications operating within the 0°C to 70°C temperature range. This variant is suitable for commercial-grade implementations where the extended low-temperature performance of the industrial-grade LTC1440IN8#PBF is not required. Both LTC1440 variants maintain ROHS3 compliance and unlimited moisture sensitivity rating, matching the regulatory profile of the MAX981EPA.

Both substitute parts are manufactured by Analog Devices Inc., ensuring consistent quality standards and technical support continuity. The transition from MAX981EPA to either LTC1440 variant requires no circuit redesign due to identical package form factor, pin configuration, and core electrical specifications.

Frequently Asked Questions (FAQ)

Q: Can LTC1440CN8#PBF and LTC1440IN8#PBF be used interchangeably with MAX981EPA?

A: Both LTC1440 variants are pin-compatible and functionally equivalent substitutes for MAX981EPA in 8-DIP through-hole applications. Selection between the two depends on operating temperature requirements. LTC1440IN8#PBF supports -40°C to 85°C operation, matching the original part's temperature range. LTC1440CN8#PBF operates from 0°C to 70°C and is suitable for commercial-grade applications.

Q: What are the key electrical differences between MAX981EPA and LTC1440 substitutes?

A: The primary electrical differences are output type specification and quiescent current. LTC1440 devices feature CMOS/TTL output capability with 40mA typical output current, compared to the MAX981EPA's unspecified output type. Quiescent current increases marginally from 4µA to 4.4µA. All other critical parameters—input offset voltage, hysteresis, CMRR, PSRR, and supply voltage range—remain identical.

Q: Are there temperature range considerations when selecting between LTC1440 variants?

A: Yes. LTC1440IN8#PBF maintains the full -40°C to 85°C operating range of MAX981EPA and is the recommended choice for industrial and extended-temperature applications. LTC1440CN8#PBF operates from 0°C to 70°C and is appropriate for commercial-grade designs where lower temperature operation is not required.

Q: Do the LTC1440 substitutes require circuit modifications?

A: No circuit modifications are required. Both LTC1440 variants maintain identical 8-DIP package geometry, pin configuration, and core electrical specifications as MAX981EPA. Direct socket replacement is possible without schematic or PCB changes.

Q: What is the supply voltage compatibility of LTC1440 substitutes?

A: LTC1440 devices support 2V to 11V single supply or ±1V to ±5.5V dual supply operation. This range is slightly broader at the lower single-supply limit (2V versus 2.5V for MAX981EPA) and identical at the upper limits, ensuring compatibility with existing MAX981EPA power supply designs.

Q: Are regulatory and compliance certifications maintained with LTC1440 substitutes?

A: Yes. Both LTC1440CN8#PBF and LTC1440IN8#PBF maintain ROHS3 compliance, REACH unaffected status, and unlimited moisture sensitivity rating (MSL 1), matching the regulatory profile of MAX981EPA.