MAX977ESD Equivalent & Substitute Parts

Part Overview

The MAX977ESD is a dual general-purpose CMOS comparator manufactured by Analog Devices Inc./Maxim Integrated, housed in a 14-SOIC surface-mount package. This device features rail-to-rail output capability with TTL compatibility and operates across a 2.7V to 5.25V supply voltage range. The MAX977ESD is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support, production continuity, and component sourcing in applications requiring dual-channel comparison functionality.

Substiute Parts

MAX977ESD

Analog Devices Inc./Maxim IntegratedIn Stock: 2226MAX977ESD Datasheet

Current PartRFQ

ALD2303ASAL

Advanced Linear Devices Inc.In Stock: 980ALD2303ASAL Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MAX977ESD requires evaluation of the following critical parameters that define functional equivalence:

Primary Substitution Criteria:

• Dual-channel comparator architecture (2 independent comparison elements)
• CMOS output with rail-to-rail and TTL compatibility
• Supply voltage compatibility within or overlapping the 2.7V ~ 5.25V range
• Input offset voltage specification of 2mV or lower
• Input bias current specification of 0.1µA or lower
• Quiescent current performance suitable for low-power applications
• Operating temperature range supporting -40°C to 85°C minimum
• Surface-mount SOIC package format

The ALD2303ASAL from Advanced Linear Devices Inc. qualifies as a manufacturer-recommended substitute. While it employs an 8-SOIC package (versus the 14-SOIC of the MAX977ESD), it maintains dual-channel comparator functionality with CMOS, NMOS, and open-drain output options. The ALD2303ASAL supports an extended supply voltage range (3V ~ 10V, ±1.5V ~ 5V), superior input offset voltage (1mV @ 5V), and significantly lower input bias current (0.001µA @ 5V). However, the reduced operating temperature range (0°C ~ 70°C) and different package pinout require circuit board redesign and thermal environment verification.

Parameter Comparison

Engineering Selection Recommendations

MAX977ESD Substitution Considerations:

The MAX977ESD is classified as obsolete, necessitating component replacement for new production or long-term supply assurance. The ALD2303ASAL is the manufacturer-recommended substitute and offers active product status with ROHS3 compliance, addressing regulatory and supply chain continuity concerns.

Key Trade-offs:

The ALD2303ASAL provides superior electrical performance in input offset voltage (1mV versus 2mV) and input bias current (0.001µA versus 0.1µA), with substantially lower quiescent current consumption (40µA versus 500µA). The extended supply voltage range (3V ~ 10V) accommodates broader application requirements.

Limitations Requiring Evaluation:

The operating temperature range of the ALD2303ASAL (0°C ~ 70°C) is narrower than the MAX977ESD (-40°C ~ 85°C). Applications requiring operation below 0°C or above 70°C cannot use this substitute without thermal environment modification or alternative component selection. The package transition from 14-SOIC to 8-SOIC requires printed circuit board redesign, including pin reassignment and layout modifications. The different output stage architecture (open-drain option) may require output pull-up resistor adjustments depending on the application circuit topology.

Compliance Status:

The ALD2303ASAL meets ROHS3 compliance and REACH unaffected status, suitable for applications with environmental and regulatory requirements. The MAX977ESD is RoHS non-compliant, limiting its use in regulated markets.

Frequently Asked Questions (FAQ)

Q: Can the ALD2303ASAL directly replace the MAX977ESD without circuit modification?

A: No. While both devices are dual-channel comparators with CMOS output capability, the ALD2303ASAL uses an 8-SOIC package versus the 14-SOIC package of the MAX977ESD. Pin assignments differ, requiring printed circuit board redesign. Additionally, the operating temperature range is narrower (0°C ~ 70°C versus -40°C ~ 85°C), which must be evaluated against application thermal requirements.

Q: What are the key electrical advantages of the ALD2303ASAL?

A: The ALD2303ASAL offers superior input offset voltage (1mV versus 2mV), significantly lower input bias current (0.001µA versus 0.1µA), and substantially reduced quiescent current (40µA versus 500µA). These characteristics result in lower power consumption and improved precision in comparison applications.

Q: Is the ALD2303ASAL suitable for applications requiring -40°C operation?

A: No. The ALD2303ASAL operating temperature range begins at 0°C. Applications requiring operation at -40°C must identify alternative comparators with extended low-temperature specifications or implement thermal management strategies to maintain the device within its specified operating range.

Q: What is the impact of the package change from 14-SOIC to 8-SOIC?

A: The package transition requires complete circuit board redesign, including footprint modification, pin reassignment, and trace routing changes. The 8-SOIC package is physically smaller, which may provide board space benefits but necessitates full design validation and testing before production implementation.

Q: Does the ALD2303ASAL support rail-to-rail output like the MAX977ESD?

A: The ALD2303ASAL provides CMOS, NMOS, and open-drain output options with TTL compatibility. The specific output configuration must be selected based on application requirements. Open-drain output requires external pull-up resistors, differing from the rail-to-rail output of the MAX977ESD.

Q: Are there compliance differences between these devices?

A: Yes. The MAX977ESD is RoHS non-compliant, while the ALD2303ASAL is ROHS3 compliant. Both devices are REACH unaffected. For applications subject to environmental regulations or customer requirements mandating RoHS compliance, the ALD2303ASAL is the appropriate selection.