MAX973ESA Equivalent & Substitute Parts

Part Overview

The MAX973ESA is a dual comparator with integrated voltage reference and open-drain output configuration, manufactured by Analog Devices Inc./Maxim Integrated. This 8-SOIC surface-mount linear IC operates across a wide supply voltage range (2.5V ~ 11V single supply, ±1.25V ~ 5.5V dual supply) with 50mV hysteresis and 80dB CMRR/PSRR performance. The part is currently listed as obsolete, making equivalent substitutes necessary for ongoing production and maintenance applications. Direct replacements and functionally compatible alternatives are available from Analog Devices' active product portfolio.

Key Parameters

Parameter	MAX973ESA
Manufacturer	Analog Devices Inc./Maxim Integrated
Product Status	Obsolete
Type	Comparator with Voltage Reference
Number of Elements	2
Output Type	Open-Drain
Voltage Supply (Single/Dual)	2.5V ~ 11V / ±1.25V ~ 5.5V
Input Offset Voltage (Max)	10mV @ 5V
Quiescent Current (Max)	6µA
CMRR / PSRR (Typ)	80dB / 80dB
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
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the MAX973ESA is determined by the following critical parameters that must remain consistent:

Core Functional Requirements:

Dual comparator configuration (2 elements)
Integrated voltage reference
Open-drain output topology
Supply voltage range: 2.5V ~ 11V (single) / ±1.25V ~ 5.5V (dual)
Input offset voltage: 10mV @ 5V maximum
Hysteresis: 50mV
CMRR/PSRR: 80dB minimum

Package & Environmental Requirements:

8-SOIC surface-mount package (0.154" width, 3.90mm)
Operating temperature: -40°C ~ 85°C
ROHS3 compliance
MSL 1 rating

Substitutes are grouped into two categories:

Direct Equivalents (Packaging Variants): MAX973ESA+ differs only in packaging format (tube vs. standard), maintaining identical electrical specifications and active product status.

Functional Equivalents (LTC1843 Series): LTC1843IS8#PBF and LTC1843IS8#TRPBF provide identical electrical performance with open-drain output, matching all critical parameters including supply range, offset voltage, hysteresis, and temperature range. These differ only in packaging format (tube vs. tape & reel).

Alternative Output Configuration (LTC1442 Series): LTC1442 variants feature CMOS/TTL output instead of open-drain, with slightly different supply voltage minimums (2V vs. 2.5V) and extended output current capability (40mA typical). These are suitable only when output configuration compatibility is confirmed.

Extended Temperature Variants (LTC1842 Series): LTC1842 parts maintain open-drain output and identical electrical specifications but with restricted operating temperature (0°C ~ 70°C for commercial grades, -40°C ~ 85°C for industrial grades). Selection depends on application temperature requirements.

Parameter Comparison

Part Number	Manufacturer	Product Status	Output Type	Supply Voltage	Input Offset (Max)	Quiescent Current (Max)	Hysteresis	Operating Temp	Packaging
MAX973ESA	Analog Devices/Maxim	Obsolete	Open-Drain	2.5V~11V / ±1.25V~5.5V	10mV @ 5V	6µA	50mV	-40°C ~ 85°C	8-SOIC Tube
MAX973ESA+	Analog Devices/Maxim	Active	Open-Drain	2.5V~11V / ±1.25V~5.5V	10mV @ 5V	6µA	50mV	-40°C ~ 85°C	8-SOIC Tube
LTC1843IS8#PBF	Analog Devices	Active	Open-Drain	2.5V~11V / ±1.25V~5.5V	10mV @ 5V	5.7µA	50mV	-40°C ~ 85°C	8-SO Tube
LTC1843IS8#TRPBF	Analog Devices	Active	Open-Drain	2.5V~11V / ±1.25V~5.5V	10mV @ 5V	5.7µA	50mV	-40°C ~ 85°C	8-SO Tape & Reel
LTC1842IS8#PBF	Analog Devices	Active	Open-Drain	2.5V~11V / ±1.25V~5.5V	10mV @ 5V	5.7µA	50mV	-40°C ~ 85°C	8-SO Tube
LTC1842IS8#TRPBF	Analog Devices	Active	Open-Drain	2.5V~11V / ±1.25V~5.5V	10mV @ 5V	5.7µA	50mV	-40°C ~ 85°C	8-SO Tape & Reel
LTC1442IS8#PBF	Analog Devices	Active	CMOS/TTL	2V~11V / ±1V~5.5V	10mV @ 5V	5.7µA	50mV	-40°C ~ 85°C	8-SO Tube
LTC1442IS8#TRPBF	Analog Devices	Active	CMOS/TTL	2V~11V / ±1V~5.5V	10mV @ 5V	5.7µA	50mV	-40°C ~ 85°C	8-SO Tape & Reel
LTC1442CS8#PBF	Analog Devices	Active	CMOS/TTL	2V~11V / ±1V~5.5V	10mV @ 5V	5.7µA	50mV	0°C ~ 70°C	8-SO Tube
LTC1442CS8#TRPBF	Analog Devices	Active	CMOS/TTL	2V~11V / ±1V~5.5V	10mV @ 5V	5.7µA	50mV	0°C ~ 70°C	8-SO Tape & Reel
LTC1842CS8#PBF	Analog Devices	Active	Open-Drain	2.5V~11V / ±1.25V~5.5V	10mV @ 5V	5.7µA	50mV	0°C ~ 70°C	8-SO Tube
LTC1842CS8#TRPBF	Analog Devices	Active	Open-Drain	2.5V~11V / ±1.25V~5.5V	10mV @ 5V	5.7µA	50mV	0°C ~ 70°C	8-SO Tape & Reel

Engineering Selection Recommendations

Primary Recommendation for Direct Replacement: MAX973ESA+ is the preferred substitute, offering identical electrical specifications and active product status. This part maintains full compatibility with existing designs while ensuring continued supply availability.

Secondary Recommendation for Open-Drain Output Requirement: LTC1843IS8#PBF or LTC1843IS8#TRPBF provide functionally equivalent performance with open-drain output topology. Both maintain the full -40°C ~ 85°C operating temperature range and identical supply voltage specifications. Selection between tube (PBF) and tape & reel (TRPBF) packaging depends on production volume and assembly requirements.

Alternative for Industrial Temperature Range: LTC1842IS8#PBF and LTC1842IS8#TRPBF maintain open-drain output and extended temperature operation (-40°C ~ 85°C), suitable for applications requiring industrial-grade temperature performance.

Output Configuration Alternative: LTC1442 series (IS8 variants with -40°C ~ 85°C rating) provide CMOS/TTL output instead of open-drain. These are suitable only when the application circuit can accommodate push-pull output topology and does not require open-drain characteristics. Note the slightly reduced minimum supply voltage (2V vs. 2.5V single supply).

Commercial Temperature Constraint: LTC1442CS8 and LTC1842CS8 variants operate only within 0°C ~ 70°C range and are unsuitable for applications requiring full -40°C ~ 85°C operation.

All recommended substitutes maintain ROHS3 compliance and MSL 1 rating, ensuring compatibility with standard manufacturing and storage requirements.

Frequently Asked Questions (FAQ)

Q: Can MAX973ESA be directly replaced with MAX973ESA+? A: Yes. MAX973ESA+ is the active production equivalent with identical electrical specifications, supply voltage range, output configuration, and temperature rating. The only difference is product status (active vs. obsolete) and packaging format designation.

Q: What is the key difference between LTC1843 and LTC1842 series substitutes? A: Both series provide open-drain output and identical electrical performance. The primary distinction is propagation delay specification (12µs for both) and quiescent current (5.7µA for both). Selection depends on availability and packaging preference (tube vs. tape & reel).

Q: Can LTC1442 series replace MAX973ESA in all applications? A: LTC1442 series can replace MAX973ESA only if the application circuit is compatible with CMOS/TTL push-pull output instead of open-drain output. The output stage topology is fundamentally different. Additionally, LTC1442IS8 variants support the full -40°C ~ 85°C temperature range, while LTC1442CS8 variants are limited to 0°C ~ 70°C.

Q: What packaging options are available for substitutes? A: Substitutes are available in two packaging formats: tube (standard packaging for lower volumes) and tape & reel (for automated assembly and higher volumes). Both formats use 8-SOIC/8-SO surface-mount packages with identical electrical performance. Selection depends on production volume and assembly equipment compatibility.

Q: Are all substitutes ROHS3 compliant? A: Yes. All recommended substitutes maintain ROHS3 compliance and MSL 1 (unlimited moisture sensitivity level) rating, ensuring compatibility with standard manufacturing processes and storage conditions.

Q: What is the inventory status of substitutes? A: MAX973ESA+ (2200 pcs), LTC1843IS8#PBF (2700 pcs), LTC1843IS8#TRPBF (6023 pcs), LTC1842IS8#PBF (2994 pcs), LTC1842IS8#TRPBF (2352 pcs), LTC1442IS8#PBF (2000 pcs), LTC1442IS8#TRPBF (1401 pcs), LTC1442CS8#PBF (2048 pcs), LTC1442CS8#TRPBF (3100 pcs), LTC1842CS8#PBF (1239 pcs), and LTC1842CS8#TRPBF (2352 pcs) are available as new original stock.

Q: Does supply voltage range affect substitution compatibility? A: Yes. MAX973ESA, MAX973ESA+, LTC1843, and LTC1842 series support 2.5V ~ 11V single supply and ±1.25V ~ 5.5V dual supply. LTC1442 series supports 2V ~ 11V single supply and ±1V ~ 5.5V dual supply. Applications requiring minimum 2.5V single supply operation must use open-drain variants (LTC1843, LTC1842) rather than LTC1442.

Q: What is the significance of the #PBF and #TRPBF suffixes? A: #PBF indicates tube packaging (standard format), while #TRPBF indicates tape & reel packaging (automated assembly format). Both formats contain identical die and electrical specifications; the suffix reflects only the physical packaging and delivery method.

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