MAX977EEE Equivalent & Substitute Parts

Part Overview

The MAX977EEE is a dual general-purpose comparator manufactured by Analog Devices Inc./Maxim Integrated, housed in a 16-QSOP surface-mount package. This device features rail-to-rail CMOS output with TTL compatibility and operates across a 2.7V to 5.25V supply range. The product is currently obsolete, making equivalent substitutes necessary for ongoing design support and component procurement.

Key Parameters

Parameter	MAX977EEE
Manufacturer	Analog Devices Inc./Maxim Integrated
Category	Linear - Comparator
Type	General Purpose
Number of Elements	2
Output Type	CMOS, Rail-to-Rail, TTL
Voltage Supply Range	2.7V ~ 5.25V (Single)
Input Offset Voltage (Max)	2mV @ 5V
Input Bias Current (Max)	0.1µA @ 5.25V
Quiescent Current (Max)	500µA
CMRR / PSRR (Typ)	82dB CMRR, 90dB PSRR
Propagation Delay (Max)	820ns
Hysteresis	4mV
Operating Temperature	-40°C ~ 85°C
Package / Case	16-QSOP (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	RoHS non-compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the MAX977EEE is based on the following critical parameters:

Dual comparator configuration (2 elements per package)
General-purpose comparator topology with CMOS/TTL output compatibility
Supply voltage overlap within the 2.7V to 5.25V range
Input offset voltage performance (≤2mV @ 5V)
Input bias current characteristics (≤0.1µA)
Operating temperature range compatibility
Surface-mount packaging with equivalent pin density

The substitute parts ALD2303ASAL and ALD2303SAL, both manufactured by Advanced Linear Devices Inc., meet the functional requirements of a dual general-purpose comparator. However, these substitutes operate in an 8-SOIC package rather than the original 16-QSOP, indicating a different pinout and board layout footprint. Both ALD parts support dual supply operation (±1.5V ~ 5V) and single supply operation (3V ~ 10V), which encompasses the MAX977EEE's 2.7V to 5.25V range.

Parameter Comparison

Parameter	MAX977EEE	ALD2303ASAL	ALD2303SAL
Manufacturer	Analog Devices Inc./Maxim Integrated	Advanced Linear Devices Inc.	Advanced Linear Devices Inc.
Number of Elements	2	2	2
Output Type	CMOS, Rail-to-Rail, TTL	CMOS, NMOS, Open-Drain, TTL	CMOS, NMOS, Open-Drain, TTL
Voltage Supply Range	2.7V ~ 5.25V	3V ~ 10V, ±1.5V ~ 5V	3V ~ 10V, ±1.5V ~ 5V
Input Offset Voltage (Max)	2mV @ 5V	1mV @ 5V	4mV @ 5V
Input Bias Current (Max)	0.1µA @ 5.25V	0.001µA @ 5V	0.001µA @ 5V
Quiescent Current (Max)	500µA	40µA	100µA
Operating Temperature	-40°C ~ 85°C	0°C ~ 70°C	0°C ~ 70°C
Package / Case	16-QSOP	8-SOIC	8-SOIC
Product Status	Obsolete	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

ALD2303ASAL is the preferred substitute when the lowest input offset voltage (1mV @ 5V) and minimal quiescent current (40µA) are required. This part is ROHS3 compliant and carries active product status, ensuring long-term availability and supply chain stability. The narrower operating temperature range (0°C ~ 70°C) restricts use to commercial-grade applications.

ALD2303SAL provides an alternative when slightly higher input offset voltage tolerance (4mV @ 5V) is acceptable. This variant maintains ROHS3 compliance and active status while offering moderate quiescent current (100µA). Like ALD2303ASAL, it operates within 0°C ~ 70°C.

Both ALD substitutes require PCB layout redesign due to the transition from 16-QSOP to 8-SOIC packaging. The 8-SOIC package is physically smaller and has a different pinout, necessitating schematic and board-level modifications. Neither substitute supports the extended temperature range (-40°C ~ 85°C) of the original MAX977EEE, making them unsuitable for industrial or automotive applications requiring this specification.

Frequently Asked Questions (FAQ)

Q: Can ALD2303ASAL or ALD2303SAL be used as direct pin-for-pin replacements for MAX977EEE?

A: No. The MAX977EEE uses a 16-QSOP package while both ALD substitutes use an 8-SOIC package. These packages have different pinouts and physical dimensions, requiring complete PCB redesign and schematic modifications.

Q: What is the key difference between ALD2303ASAL and ALD2303SAL?

A: The primary differences are input offset voltage (1mV vs. 4mV @ 5V) and quiescent current (40µA vs. 100µA). ALD2303ASAL offers superior precision and lower power consumption, while ALD2303SAL provides a cost-effective alternative with relaxed offset specifications.

Q: Are the ALD substitutes suitable for applications requiring -40°C to 85°C operation?

A: No. Both ALD parts operate only within 0°C to 70°C. Applications requiring the extended temperature range of the MAX977EEE must pursue alternative solutions or consider the original part from remaining inventory.

Q: Do the ALD substitutes meet modern environmental compliance standards?

A: Yes. Both ALD2303ASAL and ALD2303SAL are ROHS3 compliant and REACH unaffected, meeting current environmental regulations. The original MAX977EEE is RoHS non-compliant.

Q: What supply voltage ranges do the ALD substitutes support?

A: Both support dual supply operation (±1.5V ~ 5V) and single supply operation (3V ~ 10V), which encompasses the MAX977EEE's 2.7V to 5.25V single-supply range.

Q: How do the input bias current specifications compare?

A: The ALD substitutes offer significantly lower input bias current (0.001µA @ 5V) compared to the MAX977EEE (0.1µA @ 5.25V), representing a 100-fold improvement in this parameter.

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