MAX991ESA+ Equivalent & Substitute Parts

Part Overview

The MAX991ESA+ is a dual-channel general-purpose comparator manufactured by Analog Devices Inc./Maxim Integrated. This CMOS, push-pull, rail-to-rail comparator operates across 2.5V to 5.5V single supply or ±1.25V to ±2.75V dual supply configurations. The device is classified as Active product status with 3,364 units currently in stock. Equivalent and substitute parts are identified based on matching electrical performance parameters, package compatibility, and functional equivalence for applications requiring dual-channel comparison functionality in 8-SOIC surface-mount form factor.

Key Parameters

Parameter	MAX991ESA+ Specification
Manufacturer	Analog Devices Inc./Maxim Integrated
Category	Linear
Type	General Purpose Comparator
Number of Elements	2
Output Type	CMOS, Push-Pull, Rail-to-Rail, TTL
Voltage Supply (Single/Dual)	2.5V ~ 5.5V / ±1.25V ~ 2.75V
Input Offset Voltage (Max)	5mV @ 5.5V
Input Bias Current (Max)	1pA @ 5.5V
Quiescent Current (Max)	96µA
CMRR / PSRR (Typ)	80dB / 80dB
Propagation Delay (Max)	210ns
Hysteresis	±2.5mV
Operating Temperature	-40°C ~ 85°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the MAX991ESA+ are classified based on the following substitution criteria:

Primary Substitution Parameters:

Dual-channel comparator configuration (2 elements)
8-SOIC or equivalent 8-pin surface-mount package
Push-pull output capability
Supply voltage range compatibility with 2.5V ~ 5.5V operation
Input offset voltage ≤ 5mV
Input bias current ≤ 1pA
Operating temperature range -40°C ~ 85°C or extended
CMRR and PSRR ≥ 75dB

Parametric Equivalent: MAX987ESA+ differs only in element count (1 vs. 2 channels) while maintaining identical electrical specifications and package form factor.

Manufacturer Recommended Substitutes: ALD2302ASAL, ALD2302SAL, AZV3002S-13, BU7232F-E2, BU7232SF-E2, BU7252SF-E2, LMC6762AIMX, and LMC6762BIM are qualified alternatives meeting core functional requirements with variations in supply voltage range, quiescent current, and propagation delay characteristics.

Parameter Comparison

Part Number	Manufacturer	Elements	Output Type	Supply Voltage	Input Offset (Max)	Input Bias (Max)	Quiescent Current (Max)	Propagation Delay (Max)	Operating Temp	Package	Status
MAX991ESA+	Analog Devices	2	CMOS, Push-Pull, Rail-to-Rail, TTL	2.5V ~ 5.5V / ±1.25V ~ 2.75V	5mV @ 5.5V	1pA @ 5.5V	96µA	210ns	-40°C ~ 85°C	8-SOIC (3.90mm)	Active
MAX987ESA+	Analog Devices	1	CMOS, Push-Pull, Rail-to-Rail, TTL	2.5V ~ 5.5V / ±1.25V ~ 2.75V	5mV @ 5.5V	1pA @ 5.5V	96µA	210ns	-40°C ~ 85°C	8-SOIC (3.90mm)	Active
ALD2302ASAL	Advanced Linear Devices	2	CMOS, NMOS, Push-Pull, TTL	4V ~ 10V / ±2V ~ 5V	1mV @ 5V	0.001µA @ 5V	500µA	—	0°C ~ 70°C	8-SOIC (3.90mm)	Active
ALD2302SAL	Advanced Linear Devices	2	CMOS, NMOS, Push-Pull, TTL	4V ~ 10V / ±2V ~ 5V	4mV @ 5V	0.001µA @ 5V	500µA	—	0°C ~ 70°C	8-SOIC (3.90mm)	Active
AZV3002S-13	Diodes Incorporated	2	Push-Pull	1.6V ~ 5.5V	30mV	1pA	9µA (Typ)	0.8µs	-40°C ~ 85°C	8-SOIC (3.90mm)	Active
BU7232F-E2	Rohm Semiconductor	2	Push-Pull	1.8V ~ 5.5V / ±0.9V ~ 2.75V	11mV @ 3V	1pA @ 3V	25µA	1.7µs	-40°C ~ 85°C	8-SOIC (4.40mm)	Active
BU7232SF-E2	Rohm Semiconductor	2	Push-Pull	1.8V ~ 5.5V / ±0.9V ~ 2.75V	11mV @ 3V	1pA @ 3V	25µA	1.7µs	-40°C ~ 105°C	8-SOIC (4.40mm)	Active
BU7252SF-E2	Rohm Semiconductor	2	Push-Pull	1.8V ~ 5.5V / ±0.9V ~ 2.75V	11mV @ 3V	1pA @ 3V	65µA	550ns	-40°C ~ 105°C	8-SOIC (4.40mm)	Active
LMC6762AIMX	Texas Instruments	2	Push-Pull, Rail-to-Rail	2.7V ~ 15V / ±1.35V ~ 7.5V	5mV @ 5V	0.04pA @ 5V	20µA	10µs	-40°C ~ 85°C	8-SOIC (3.90mm)	Obsolete
LMC6762BIM	Texas Instruments	2	Push-Pull, Rail-to-Rail	2.7V ~ 15V / ±1.35V ~ 7.5V	15mV @ 5V	0.04pA @ 5V	20µA	10µs	-40°C ~ 85°C	8-SOIC (3.90mm)	Obsolete

Engineering Selection Recommendations

Active Product Status Preference: MAX991ESA+, MAX987ESA+, ALD2302ASAL, ALD2302SAL, AZV3002S-13, BU7232F-E2, BU7232SF-E2, and BU7252SF-E2 maintain Active product status and are recommended for new designs. LMC6762AIMX and LMC6762BIM are classified as Obsolete and should be used only for legacy system maintenance or when existing inventory constraints require their use.

Compliance Certification: All listed substitute parts maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, matching the MAX991ESA+ environmental qualification profile. LMC6762AIMX carries REACH Affected status, while all other alternatives maintain REACH Unaffected or REACH Affected designations consistent with the main part.

Supply Voltage Compatibility: Direct substitution within 2.5V ~ 5.5V single-supply operation is supported by MAX987ESA+, AZV3002S-13, BU7232F-E2, BU7232SF-E2, BU7252SF-E2, LMC6762AIMX, and LMC6762BIM. ALD2302ASAL and ALD2302SAL require minimum 4V supply and are suitable only for applications operating above this threshold.

Package Considerations: MAX991ESA+ uses 8-SOIC with 3.90mm width. BU7232F-E2, BU7232SF-E2, and BU7252SF-E2 use 8-SOIC with 4.40mm width, requiring PCB layout verification for pin-to-pin compatibility. All other alternatives maintain 3.90mm width matching the original part.

Frequently Asked Questions (FAQ)

Q: Can MAX987ESA+ directly replace MAX991ESA+ in dual-channel applications?

A: No. MAX987ESA+ contains a single comparator element while MAX991ESA+ contains two. MAX987ESA+ is suitable only for applications requiring single-channel comparison. For dual-channel functionality, use alternatives with 2-element configuration: ALD2302ASAL, ALD2302SAL, AZV3002S-13, BU7232F-E2, BU7232SF-E2, BU7252SF-E2, LMC6762AIMX, or LMC6762BIM.

Q: What is the primary difference between BU7232SF-E2 and BU7252SF-E2?

A: Both devices share identical supply voltage, input offset, input bias, and CMRR/PSRR specifications. BU7252SF-E2 offers faster propagation delay (550ns vs. 1.7µs) and higher quiescent current (65µA vs. 25µA). Selection depends on speed requirements and power budget constraints.

Q: Are ALD2302ASAL and ALD2302SAL interchangeable?

A: Both devices are dual-channel comparators in 8-SOIC package with identical supply voltage range (4V ~ 10V), input bias current (0.001µA), and quiescent current (500µA). ALD2302ASAL specifies 1mV maximum input offset voltage while ALD2302SAL specifies 4mV. Selection depends on offset voltage tolerance requirements.

Q: Why are LMC6762AIMX and LMC6762BIM marked Obsolete?

A: Both Texas Instruments parts are classified as Obsolete product status. They remain available from existing inventory (5,251 and 1,543 units respectively) but are not recommended for new designs. Use Active alternatives for long-term supply assurance.

Q: Can substitutes with 4.40mm package width be used on MAX991ESA+ PCB layouts?

A: BU7232F-E2, BU7232SF-E2, and BU7252SF-E2 use 8-SOIC package with 4.40mm width versus MAX991ESA+ 3.90mm width. Pin spacing remains standard 8-SOIC, but physical package dimensions differ. PCB layout verification is required to confirm clearance and thermal management compatibility before substitution.

Q: What supply voltage range ensures compatibility across all substitute options?

A: The common supply voltage range across all Active substitutes is 1.8V ~ 5.5V single supply. ALD2302ASAL and ALD2302SAL require minimum 4V operation. For applications operating below 4V, use MAX991ESA+, MAX987ESA+, AZV3002S-13, BU7232F-E2, BU7232SF-E2, BU7252SF-E2, LMC6762AIMX, or LMC6762BIM.

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