MAX923ESA Equivalent & Substitute Parts

Part Overview

The MAX923ESA is a dual comparator with integrated voltage reference manufactured by Analog Devices Inc./Maxim Integrated. This device combines CMOS and TTL output stages in an 8-SOIC surface mount package, designed for precision voltage comparison applications across industrial and commercial temperature ranges. The MAX923ESA is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production support. Active alternatives from the same manufacturer family provide functional equivalence with enhanced availability and extended product lifecycle support.

Key Parameters

Parameter	MAX923ESA
Number of Elements	2
Output Type	CMOS, TTL
Voltage - Supply, Single/Dual (±)	2.5V ~ 11V, ±1.25V ~ 5.5V
Voltage - Input Offset (Max)	10mV @ 5V
Current - Output (Typ)	50mA
Current - Quiescent (Max)	7.5µA
CMRR, PSRR (Typ)	80dB CMRR, 80dB PSRR
Propagation Delay (Max)	12µs
Hysteresis	50mV
Operating Temperature	-40°C ~ 85°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 MAX923ESA is determined by strict equivalence across the following critical parameters:

Primary Substitution Criteria:

Number of comparator elements: 2
Package type: 8-SOIC surface mount
Hysteresis: 50mV
Input offset voltage: 10mV @ 5V
CMRR and PSRR: 80dB minimum
RoHS3 compliance and MSL Level 1

Output Type Considerations: The MAX923ESA provides CMOS and TTL output stages. Substitute parts are grouped into two categories:

CMOS/TTL Output Substitutes (MAX923ESA+): Direct functional equivalents with identical output characteristics and extended product status (Active).
LTC1442 Series (LTC1442CS8#PBF, LTC1442CS8#TRPBF, LTC1442IS8#PBF, LTC1442IS8#TRPBF): Functionally equivalent comparators with CMOS/TTL outputs. Operating temperature range varies by grade (0°C ~ 70°C for commercial, -40°C ~ 85°C for industrial). Output current is reduced to 40mA typical. Quiescent current is 5.7µA. Propagation delay extends to 15µs maximum.
LTC1843 Series (LTC1843CS8#PBF, LTC1843CS8#TRPBF, LTC1843IS8#PBF, LTC1843IS8#TRPBF): Functionally equivalent comparators with open-drain output architecture. These parts maintain identical supply voltage ranges, input offset, hysteresis, and propagation delay (12µs) as the MAX923ESA. Operating temperature range varies by grade. Output current specification is not applicable due to open-drain topology.

Packaging Variants: Tube packaging and Tape & Reel (TR) packaging are interchangeable for the same base part number, with selection based on procurement and assembly requirements.

Parameter Comparison

Parameter	MAX923ESA	MAX923ESA+	LTC1442CS8#PBF	LTC1442IS8#PBF	LTC1843CS8#PBF	LTC1843IS8#PBF
Number of Elements	2	2	2	2	2	2
Output Type	CMOS, TTL	CMOS, TTL	CMOS, TTL	CMOS, TTL	Open-Drain	Open-Drain
Voltage - Supply, Single/Dual (±)	2.5V ~ 11V, ±1.25V ~ 5.5V	2.5V ~ 11V, ±1.25V ~ 5.5V	2V ~ 11V, ±1V ~ 5.5V	2V ~ 11V, ±1V ~ 5.5V	2.5V ~ 11V, ±1.25V ~ 5.5V	2.5V ~ 11V, ±1.25V ~ 5.5V
Voltage - Input Offset (Max)	10mV @ 5V	10mV @ 5V	10mV @ 5V	10mV @ 5V	10mV @ 5V	10mV @ 5V
Current - Output (Typ)	50mA	50mA	40mA	40mA	N/A	N/A
Current - Quiescent (Max)	7.5µA	7.5µA	5.7µA	5.7µA	5.7µA	5.7µA
CMRR, PSRR (Typ)	80dB CMRR, 80dB PSRR	80dB CMRR, 80dB PSRR	80dB CMRR, 80dB PSRR	80dB CMRR, 80dB PSRR	80dB CMRR, 80dB PSRR	80dB CMRR, 80dB PSRR
Propagation Delay (Max)	12µs	12µs	15µs	15µs	12µs	12µs
Hysteresis	50mV	50mV	50mV	50mV	50mV	50mV
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	0°C ~ 70°C	-40°C ~ 85°C	0°C ~ 70°C	-40°C ~ 85°C
Package / Case	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

MAX923ESA+ (Direct Replacement) Select MAX923ESA+ for applications requiring exact functional equivalence with the obsolete MAX923ESA. This part maintains identical electrical specifications, output characteristics, and temperature range. Product status is Active, ensuring long-term availability. Packaging options include Tube for manual assembly or Tape & Reel for automated production.

LTC1442 Series (CMOS/TTL Output Alternative) The LTC1442 family provides CMOS/TTL output functionality with reduced quiescent current (5.7µA vs. 7.5µA) and lower typical output current (40mA vs. 50mA). Propagation delay increases to 15µs maximum. Select LTC1442IS8#PBF or LTC1442IS8#TRPBF for applications requiring the full -40°C ~ 85°C industrial temperature range. Select LTC1442CS8#PBF or LTC1442CS8#TRPBF for commercial applications limited to 0°C ~ 70°C. All variants are ROHS3 compliant with MSL Level 1.

LTC1843 Series (Open-Drain Output Alternative) The LTC1843 family provides open-drain output architecture with identical propagation delay (12µs) and supply voltage ranges as the MAX923ESA. This topology eliminates the push-pull output stage, reducing power consumption and enabling direct interface with pull-up resistor networks. Select LTC1843IS8#PBF or LTC1843IS8#TRPBF for the full -40°C ~ 85°C industrial temperature range. Select LTC1843CS8#PBF or LTC1843CS8#TRPBF for commercial applications limited to 0°C ~ 70°C. All variants are ROHS3 compliant with MSL Level 1.

Packaging Selection Tube packaging (suffix #PBF) is suitable for manual assembly and lower-volume production. Tape & Reel packaging (suffix #TRPBF) is optimized for automated pick-and-place assembly and high-volume manufacturing.

Frequently Asked Questions (FAQ)

Q: Can MAX923ESA+ be used as a direct drop-in replacement for MAX923ESA? A: Yes. MAX923ESA+ maintains identical electrical specifications, output type (CMOS/TTL), supply voltage ranges, input offset, hysteresis, propagation delay, and operating temperature range (-40°C ~ 85°C). The primary difference is product status (Active vs. Obsolete) and packaging format. Both are packaged in 8-SOIC surface mount configuration.

Q: What is the key difference between LTC1442 and LTC1843 series? A: The LTC1442 series provides CMOS/TTL push-pull output stages with typical output current of 40mA. The LTC1843 series provides open-drain output architecture without specified output current. Open-drain topology requires external pull-up resistors but offers lower power consumption and simplified interface to different logic voltage levels.

Q: Can LTC1442CS8#PBF be used in applications requiring -40°C ~ 85°C operation? A: No. LTC1442CS8#PBF is rated for 0°C ~ 70°C commercial temperature range only. For full industrial temperature range (-40°C ~ 85°C), select LTC1442IS8#PBF or LTC1442IS8#TRPBF.

Q: What is the impact of increased propagation delay in LTC1442 series? A: LTC1442 series has maximum propagation delay of 15µs compared to 12µs for MAX923ESA and LTC1843 series. This 3µs difference may affect timing-critical applications. Verify propagation delay requirements in your circuit before selection.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All substitute parts listed (MAX923ESA+, LTC1442 series, LTC1843 series) are ROHS3 compliant with Moisture Sensitivity Level 1 (Unlimited), matching the compliance profile of the original MAX923ESA.

Q: What is the difference between Tube and Tape & Reel packaging? A: Tube packaging (#PBF suffix) contains components in a plastic tube suitable for manual handling and lower-volume assembly. Tape & Reel packaging (#TRPBF suffix) contains components on continuous carrier tape wound on reels, optimized for automated pick-and-place assembly equipment and high-volume production.

Q: Can LTC1843 open-drain output be used directly with TTL logic inputs? A: Open-drain output requires external pull-up resistor to a supply voltage. The pull-up voltage determines the output logic level. For TTL compatibility, pull-up to 5V with appropriate resistor value (typically 1kΩ to 10kΩ) to achieve TTL-compatible output levels.

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