MAX991ESA Equivalent & Substitute Parts

Part Overview

The MAX991ESA is a dual-channel general-purpose comparator manufactured by Analog Devices Inc./Maxim Integrated, featuring CMOS push-pull output with rail-to-rail capability and TTL compatibility. The device operates across a supply voltage range of 2.5V to 5.5V (single supply) or ±1.25V to 2.75V (dual supply), making it suitable for low-voltage analog signal comparison applications. The MAX991ESA is classified as obsolete, necessitating identification of equivalent and substitute parts for new designs or production continuity. Substitute parts must maintain functional compatibility through matching electrical parameters, package form factor, and operational characteristics.

Key Parameters

Parameter	Value	Specification
Number of Elements	2	Dual comparators per package
Output Type	CMOS, Push-Pull, Rail-to-Rail, TTL	Output configuration and compatibility
Voltage - Supply, Single/Dual (±)	2.5V ~ 5.5V, ±1.25V ~ 2.75V	Operating supply voltage range
Voltage - Input Offset (Max)	5mV @ 5.5V	Maximum input offset voltage
Current - Input Bias (Max)	1pA @ 5.5V	Maximum input bias current
Current - Quiescent (Max)	96µA	Maximum quiescent supply current
CMRR, PSRR (Typ)	80dB CMRR, 80dB PSRR	Common-mode and power-supply rejection ratios
Propagation Delay (Max)	210ns	Maximum propagation delay
Hysteresis	±2.5mV	Built-in hysteresis
Operating Temperature	-40°C ~ 85°C	Temperature operating range
Package / Case	8-SOIC (0.154", 3.90mm Width)	Surface mount package
RoHS Status	ROHS3 Compliant	Environmental compliance
Moisture Sensitivity Level (MSL)	1 (Unlimited)	Moisture handling classification

Substitute Part Grouping Explanation

Substitute parts for the MAX991ESA are classified into three categories based on substitution type and parameter alignment:

Direct Substitutes (Same Manufacturer, Active Status): MAX991ESA+ maintains identical electrical specifications and package form factor as the original MAX991ESA. The primary difference is product status (Active vs. Obsolete) and packaging format (Tube). This part is a direct replacement with no design modifications required.

Parametric Equivalents (Same Manufacturer, Single Element): MAX987ESA+ shares identical electrical characteristics and package specifications but contains only one comparator element instead of two. This part is suitable for applications requiring single-channel comparison with identical performance metrics.

Manufacturer-Recommended Alternatives (Different Manufacturers, Active Status): Substitute parts from Advanced Linear Devices (ALD2302ASAL, ALD2302SAL), Diodes Incorporated (AZV3002S-13), Rohm Semiconductor (BU7232F-E2, BU7232SF-E2, BU7252SF-E2), and Texas Instruments (LMC6762AIMX, LMC6762BIM) are selected based on the following critical parameters:

Dual-channel configuration (2 elements)
Push-pull output capability
8-pin SOIC package form factor
Operating temperature range compatibility (-40°C to 85°C or extended)
Supply voltage overlap with MAX991ESA operating range
RoHS3 compliance and MSL Level 1 rating

Substitution logic prioritizes parts with matching or superior electrical performance in input offset voltage, input bias current, quiescent current, and propagation delay characteristics. Parts with extended operating temperature ranges or lower quiescent current consumption are noted as performance enhancements.

Parameter Comparison

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

Engineering Selection Recommendations

Primary Recommendation: MAX991ESA+ The MAX991ESA+ is the direct successor to the MAX991ESA, offering identical electrical specifications and package configuration with active product status. This part eliminates obsolescence risk and is the preferred choice for design continuity. Both parts are RoHS3 compliant with MSL Level 1 rating.

Secondary Recommendation for Extended Temperature Range: BU7232SF-E2 or BU7252SF-E2 Rohm Semiconductor parts BU7232SF-E2 and BU7252SF-E2 provide active product status with extended operating temperature range (-40°C to 105°C). BU7252SF-E2 offers superior propagation delay performance (550ns vs. 210ns) with lower quiescent current consumption (65µA vs. 96µA). Both maintain dual-channel configuration, push-pull output, and 8-SOIC package compatibility. These parts are suitable for applications requiring extended temperature operation.

Alternative for Low-Voltage Applications: AZV3002S-13 Diodes Incorporated AZV3002S-13 extends the lower supply voltage limit to 1.6V while maintaining dual-channel configuration and push-pull output. This part is active and RoHS3 compliant. The trade-off includes higher input offset voltage (30mV vs. 5mV) and extended propagation delay (0.8µs vs. 210ns), making it suitable only for applications where lower supply voltage operation is critical.

Not Recommended: ALD2302 Series and LMC6762 Series ALD2302ASAL and ALD2302SAL require minimum supply voltage of 4V, incompatible with MAX991ESA's 2.5V minimum. LMC6762AIMX and LMC6762BIM are both obsolete, offering no advantage over the active MAX991ESA+. These parts should not be selected for new designs.

Frequently Asked Questions (FAQ)

Q: Can MAX987ESA+ replace MAX991ESA in all applications? A: MAX987ESA+ is a single-channel comparator versus the dual-channel MAX991ESA. It is suitable only for applications using one comparator channel. If both channels are utilized, MAX987ESA+ requires two devices per application, increasing board space and cost.

Q: What is the key difference between BU7232SF-E2 and BU7252SF-E2? A: Both parts share identical supply voltage range, input offset voltage, and input bias current specifications. BU7252SF-E2 provides faster propagation delay (550ns vs. 1.7µs) and operates at higher quiescent current (65µA vs. 25µA). Selection depends on timing-critical applications favoring BU7252SF-E2 or power-constrained designs favoring BU7232SF-E2.

Q: Are ALD2302 parts compatible with MAX991ESA? A: ALD2302ASAL and ALD2302SAL require minimum supply voltage of 4V, while MAX991ESA operates from 2.5V. These parts are not compatible with low-voltage applications below 4V. Compatibility exists only for applications operating at 4V or higher supply voltage.

Q: Why is LMC6762AIMX listed as obsolete? A: LMC6762AIMX is classified as obsolete by Texas Instruments. While it shares similar electrical characteristics with MAX991ESA, selecting an obsolete part introduces future supply chain risk. MAX991ESA+ or active alternatives from Rohm Semiconductor are preferred.

Q: Can AZV3002S-13 operate at 2.5V supply voltage? A: AZV3002S-13 minimum supply voltage is 1.6V, supporting 2.5V operation. However, input offset voltage is specified at 30mV maximum, significantly higher than MAX991ESA's 5mV specification. This part is suitable only for applications tolerating higher input offset voltage.

Q: What packaging format differences exist between substitute parts? A: All substitute parts use 8-pin SOIC surface-mount package with 0.154" width (3.90mm) or 0.173" width (4.40mm). Rohm Semiconductor parts (BU7232, BU7252) use 4.40mm width versus Analog Devices and Texas Instruments parts using 3.90mm width. PCB layout modifications may be required for parts with different package widths.

Q: Are all substitute parts RoHS3 compliant? A: All listed substitute parts are RoHS3 compliant with MSL Level 1 (Unlimited) moisture sensitivity rating, matching MAX991ESA environmental compliance specifications.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message