MAX971EPA Equivalent & Substitute Parts

Part Overview

The MAX971EPA is a linear comparator integrated circuit with integrated voltage reference, housed in an 8-DIP through-hole package. This device features open-drain output configuration and operates across a wide supply voltage range of 2.5V to 11V (single supply) or ±1.25V to 5.5V (dual supply). The MAX971EPA is classified as obsolete, making identification of active equivalent parts essential for new designs and production continuity.

Substiute Parts

MAX971EPA

Analog Devices Inc./Maxim IntegratedIn Stock: 1922MAX971EPA 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 MAX971EPA is determined by the following critical parameters that must remain compatible:

Package and Mounting: Both substitute parts maintain the 8-DIP (0.300", 7.62mm) through-hole package, ensuring direct mechanical and electrical compatibility on existing PCBs.

Functional Type: All substitute parts are comparators with integrated voltage reference, matching the core functionality of the MAX971EPA.

Number of Elements: Single comparator element in all parts.

Supply Voltage Range: Substitute parts operate at 2V ~ 11V (single supply) or ±1V ~ 5.5V (dual supply), which encompasses the MAX971EPA operating range.

Input Offset Voltage: All parts specify 10mV @ 5V maximum input offset voltage.

CMRR and PSRR: Identical specifications of 80dB for both common-mode and power-supply rejection ratios.

Hysteresis: All parts maintain 50mV hysteresis.

Output Configuration Difference: The substitute parts feature CMOS/TTL output instead of open-drain. This represents a functional enhancement, as CMOS/TTL outputs provide active push-pull drive capability while maintaining compatibility with open-drain input requirements in most applications.

Temperature Range: LTC1440IN8#PBF extends the operating range to -40°C ~ 85°C, matching the MAX971EPA. LTC1440CN8#PBF operates at 0°C ~ 70°C, representing a narrower range suitable for commercial applications.

Product Status: Both LTC1440 variants are active products, ensuring long-term availability and supply continuity.

Parameter Comparison

Engineering Selection Recommendations

For Extended Temperature Range Applications: LTC1440IN8#PBF is the direct equivalent, maintaining the -40°C ~ 85°C operating temperature range of the MAX971EPA while providing active product status and ROHS3 compliance. This part is suitable for industrial and automotive applications requiring full temperature coverage.

For Commercial Temperature Range Applications: LTC1440CN8#PBF operates within 0°C ~ 70°C, appropriate for consumer and commercial equipment. This variant offers the same functional performance within a narrower temperature specification.

Output Configuration Consideration: Both LTC1440 variants feature CMOS/TTL output architecture compared to the MAX971EPA open-drain output. The CMOS/TTL configuration provides active drive capability and is compatible with standard logic interfaces. Applications originally designed for open-drain outputs will function with CMOS/TTL outputs without circuit modification, as the output can drive both active-high and active-low logic levels.

Compliance and Availability: Both substitute parts maintain ROHS3 compliance, MSL Level 1 rating, and active product status, ensuring regulatory compliance and long-term supply availability for production and design continuity.

Frequently Asked Questions (FAQ)

Q: Can LTC1440CN8#PBF or LTC1440IN8#PBF be used as direct replacements for MAX971EPA?

A: Yes. Both parts are pin-compatible 8-DIP packages with identical pinout. The functional specifications—input offset voltage, hysteresis, CMRR, and PSRR—are identical. The primary difference is output type (CMOS/TTL versus open-drain) and operating temperature range. For applications within 0°C to 70°C, LTC1440CN8#PBF is suitable. For applications requiring -40°C to 85°C operation, LTC1440IN8#PBF is the appropriate choice.

Q: What is the difference between open-drain and CMOS/TTL output?

A: Open-drain output requires an external pull-up resistor to establish a high logic level. CMOS/TTL output provides active push-pull drive, sourcing current for high levels and sinking current for low levels. CMOS/TTL outputs are compatible with standard logic circuits and do not require external pull-up resistors, though pull-ups may still be used if needed for specific applications.

Q: Are the supply voltage ranges compatible?

A: The LTC1440 variants operate at 2V ~ 11V (single supply) or ±1V ~ 5.5V (dual supply), which encompasses the MAX971EPA range of 2.5V ~ 11V or ±1.25V ~ 5.5V. The LTC1440 lower supply limit of 2V is lower than the MAX971EPA minimum of 2.5V, providing additional flexibility for low-voltage applications.

Q: Which substitute part should I select for new designs?

A: For new designs, select based on operating temperature requirements. LTC1440IN8#PBF (-40°C ~ 85°C) is recommended for applications requiring extended temperature coverage. LTC1440CN8#PBF (0°C ~ 70°C) is suitable for commercial applications. Both parts are active products with established supply chains.

Q: Are there any differences in quiescent current consumption?

A: The MAX971EPA specifies 4µA maximum quiescent current, while both LTC1440 variants specify 4.4µA maximum