MAX9022ASA-T Equivalent & Substitute Parts

Part Overview

The MAX9022ASA-T is a dual-channel general-purpose comparator manufactured by Analog Devices Inc./Maxim Integrated, featuring CMOS rail-to-rail TTL output in an 8-SOIC surface-mount package. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The comparator operates across a supply voltage range of 2.5V to 5.5V (single supply) or ±1.25V to ±2.75V (dual supply), with specifications optimized for general-purpose signal comparison applications requiring low input offset voltage and moderate propagation delay.

Key Parameters

Parameter	Value	Unit
Number of Elements	2	Channels
Output Type	CMOS, Rail-to-Rail, TTL	—
Voltage - Supply, Single/Dual (±)	2.5V ~ 5.5V, ±1.25V ~ 2.75V	V
Voltage - Input Offset (Max)	1mV @ 5V	mV
Current - Input Bias (Max)	0.003µA @ 5V	µA
Current - Quiescent (Max)	5µA	µA
CMRR, PSRR (Typ)	100dB CMRR, 80dB PSRR	dB
Propagation Delay (Max)	8µs	µs
Hysteresis	4mV	mV
Operating Temperature	-40°C ~ 125°C	°C
Package / Case	8-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the MAX9022ASA-T is determined by the following critical parameters:

Dual-channel configuration: All substitutes must provide exactly 2 independent comparator elements
Output type compatibility: CMOS rail-to-rail TTL output is the primary requirement; push-pull outputs are functionally compatible for TTL-level signaling
Supply voltage range: Substitutes must support the 2.5V to 5.5V single-supply range or equivalent dual-supply operation
Input offset voltage: Maximum 1mV specification at 5V ensures precision signal comparison
Input bias current: Low bias current (≤0.003µA) prevents loading effects on high-impedance signal sources
Quiescent current: Maximum 5µA specification supports low-power applications
Package compatibility: 8-SOIC surface-mount package with 0.154" width is the mechanical standard
Temperature range: Operating range of -40°C to 125°C defines the thermal envelope
Compliance: ROHS3 compliance and MSL 1 rating ensure regulatory and manufacturing compatibility

Substitutes are grouped into two categories: direct pin-compatible replacements (MAX9022ASA+T) and functionally equivalent alternatives that meet the core electrical specifications while potentially differing in secondary parameters such as propagation delay, hysteresis, or quiescent current.

Parameter Comparison

Part Number	Manufacturer	Product Status	Output Type	Supply Voltage (Single)	Input Offset (Max)	Quiescent Current (Max)	Propagation Delay (Max)	Package	Temp Range
MAX9022ASA-T	Analog Devices/Maxim	Obsolete	CMOS, Rail-to-Rail, TTL	2.5V ~ 5.5V	1mV @ 5V	5µA	8µs	8-SOIC	-40°C ~ 125°C
MAX9022ASA+T	Analog Devices/Maxim	Active	CMOS, Rail-to-Rail, TTL	2.5V ~ 5.5V	1mV @ 5V	5µA	8µs	8-SOIC	-40°C ~ 125°C
ALD2302ASAL	Advanced Linear Devices	Active	CMOS, NMOS, Push-Pull, TTL	4V ~ 10V	1mV @ 5V	500µA	—	8-SOIC	0°C ~ 70°C
ALD2302SAL	Advanced Linear Devices	Active	CMOS, NMOS, Push-Pull, TTL	4V ~ 10V	4mV @ 5V	500µA	—	8-SOIC	0°C ~ 70°C
AZV3002RL-7	Diodes Incorporated	Active	Push-Pull	1.6V ~ 5.5V	30mV	6µA (Typ)	0.8µs	8-UFLGA	-40°C ~ 85°C
BU7232F-E2	Rohm Semiconductor	Active	Push-Pull	1.8V ~ 5.5V	11mV @ 3V	25µA	1.7µs	8-SOIC	-40°C ~ 85°C
BU7232FVM-TR	Rohm Semiconductor	Active	Push-Pull	1.8V ~ 5.5V	11mV @ 3V	25µA	1.7µs	8-MSOP	-40°C ~ 85°C
BU7232SF-E2	Rohm Semiconductor	Active	Push-Pull	1.8V ~ 5.5V	11mV @ 3V	25µA	1.7µs	8-SOIC	-40°C ~ 105°C
BU7252SF-E2	Rohm Semiconductor	Active	Push-Pull	1.8V ~ 5.5V	11mV @ 3V	65µA	550ns	8-SOIC	-40°C ~ 105°C
LMC6762AIM	Texas Instruments	Obsolete	Push-Pull, Rail-to-Rail	2.7V ~ 15V	5mV @ 5V	20µA	10µs	8-SOIC	-40°C ~ 85°C
LMC6762BIM/NOPB	Texas Instruments	Last Time Buy	Push-Pull, Rail-to-Rail	2.7V ~ 15V	15mV @ 5V	20µA	10µs	8-SOIC	-40°C ~ 85°C

Engineering Selection Recommendations

Direct Replacement (Recommended for Immediate Substitution)

MAX9022ASA+T is the primary substitute for MAX9022ASA-T. This part is electrically and mechanically identical, differing only in packaging format (Tape & Reel versus individual tube). The part is in active production status with higher inventory availability (3250 pcs), ensuring supply continuity. Both parts maintain ROHS3 compliance and MSL 1 rating. This substitution requires no circuit redesign or validation.

Active Alternatives for New Designs

For applications where supply of MAX9022ASA+T becomes constrained, the following active parts provide functional equivalence:

BU7232SF-E2 and BU7232F-E2 (Rohm Semiconductor) offer push-pull output topology compatible with TTL signaling. These parts operate across 1.8V to 5.5V supply range, supporting the MAX9022 operating envelope. The extended temperature rating of BU7232SF-E2 (-40°C to 105°C) exceeds the original specification. Quiescent current of 25µA is higher than the original 5µA specification. Propagation delay of 1.7µs is faster than the original 8µs specification.

BU7252SF-E2 (Rohm Semiconductor) provides the fastest propagation delay (550ns) among active substitutes, with extended temperature range (-40°C to 105°C). Quiescent current of 65µA represents a trade-off for improved speed performance.

AZV3002RL-7 (Diodes Incorporated) operates across the widest supply voltage range (1.6V to 5.5V) and delivers the fastest propagation delay (0.8µs). Package format is 8-UFLGA, requiring PCB layout modification. Input offset voltage of 30mV is significantly higher than the original 1mV specification.

Compatibility Constraints

ALD2302ASAL and ALD2302SAL (Advanced Linear Devices) require minimum supply voltage of 4V, restricting use in applications operating below this threshold. Operating temperature range is limited to 0°C to 70°C, narrower than the original -40°C to 125°C specification.

LMC6762AIM and LMC6762BIM/NOPB (Texas Instruments) are classified as obsolete or last-time-buy, limiting their suitability for new production. These parts support extended supply voltage range (2.7V to 15V) and offer rail-to-rail output capability. Input offset voltage specifications (5mV and 15mV respectively) exceed the original 1mV requirement.

All substitute parts maintain ROHS3 compliance and MSL 1 rating, ensuring regulatory and manufacturing process compatibility with the original device.

Frequently Asked Questions (FAQ)

Q: Can MAX9022ASA+T be used as a direct drop-in replacement for MAX9022ASA-T?

A: Yes. MAX9022ASA+T is electrically and mechanically identical to MAX9022ASA-T. The only difference is packaging format: MAX9022ASA-T is supplied in tube packaging, while MAX9022ASA+T is supplied in tape and reel format. No circuit modifications are required.

Q: What is the primary reason to substitute the MAX9022ASA-T?

A: The MAX9022ASA-T is classified as obsolete. Substitution is necessary to ensure long-term supply availability and production continuity. MAX9022ASA+T is the recommended direct replacement, as it is in active production status.

Q: Are push-pull output comparators compatible with circuits designed for CMOS rail-to-rail TTL output?

A: Push-pull output comparators are functionally compatible with TTL-level signaling applications. Both output types provide digital logic levels suitable for TTL input stages. However, push-pull outputs may exhibit different output impedance and slew rate characteristics. Circuit validation is recommended when substituting output types.

Q: What are the key electrical differences between the MAX9022ASA-T and BU7232SF-E2?

A: BU7232SF-E2 operates across a lower minimum supply voltage (1.8V versus 2.5V) and supports an extended temperature range (-40°C to 105°C versus -40°C to 125°C). Quiescent current is higher (25µA versus 5µA), and propagation delay is faster (1.7µs versus 8µs). Input offset voltage is higher (11mV @ 3V versus 1mV @ 5V). These differences may impact power consumption and timing-critical applications.

Q: Can AZV3002RL-7 replace MAX9022ASA-T in existing PCB designs?

A: AZV3002RL-7 is not a direct PCB replacement. The package format is 8-UFLGA, whereas MAX9022ASA-T uses 8-SOIC. PCB layout and footprint redesign is required. Additionally, input offset voltage of 30mV is significantly higher than the original 1mV specification, which may affect precision signal comparison applications.

Q: What is the impact of higher quiescent current in substitute parts?

A: Higher quiescent current increases power consumption during idle operation. For battery-powered or low-power applications, this may be a limiting factor. BU7232 series parts (25µA) and BU7252SF-E2 (65µA) consume more standby power than the original MAX9022ASA-T (5µA). Power budget analysis is recommended before substitution.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed are ROHS3 compliant and carry MSL 1 (unlimited moisture sensitivity level) rating, ensuring compatibility with standard manufacturing processes and regulatory requirements.

Q: Which substitute offers the fastest propagation delay?

A: BU7252SF-E2 provides the fastest propagation delay at 550ns, compared to the original MAX9022ASA-T specification of 8µs. This faster response time may benefit timing-critical applications but requires validation to ensure no adverse effects on circuit stability or noise immunity.

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