MAX973ESA-T Equivalent & Substitute Parts

Part Overview

The MAX973ESA-T 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 to 11V single supply, ±1.25V to ±5.5V dual supply) and is designed for precision voltage comparison applications requiring low quiescent current and integrated reference functionality.

The MAX973ESA-T is classified as obsolete. Substitute parts are necessary to maintain design continuity and ensure long-term component availability for new production runs and field replacements.

Key Parameters

Parameter	Value
Manufacturer	Analog Devices Inc./Maxim Integrated
Part Number	MAX973ESA-T
Category	Linear - Comparator with Voltage Reference
Package Type	8-SOIC (0.154", 3.90mm Width)
Number of Elements	2
Output Type	Open-Drain
Supply Voltage Range	2.5V ~ 11V (single), ±1.25V ~ 5.5V (dual)
Input Offset Voltage (Max)	10mV @ 5V
Quiescent Current (Max)	6µA
CMRR / PSRR (Typ)	80dB / 80dB
Hysteresis	50mV
Operating Temperature	-40°C ~ 85°C
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the MAX973ESA-T is determined by the following critical parameters:

Primary Substitution Criteria:

Output Type: Open-Drain (mandatory match)
Number of Elements: 2 (mandatory match)
Supply Voltage Range: 2.5V ~ 11V single supply, ±1.25V ~ 5.5V dual supply (mandatory match)
Input Offset Voltage: 10mV @ 5V (mandatory match)
Hysteresis: 50mV (mandatory match)
CMRR / PSRR: 80dB (mandatory match)
Package Type: 8-SOIC surface mount (mandatory match)
Operating Temperature: -40°C ~ 85°C (mandatory match for industrial applications)

Substitute Categories:

Direct Substitutes (Identical Electrical Specifications):

MAX973ESA+T: Active product status, tape & reel packaging
LTC1843IS8#PBF: Active product, tube packaging, 5.7µA quiescent current
LTC1843IS8#TRPBF: Active product, tape & reel packaging, 5.7µA quiescent current

Functional Alternatives (Output Type Variation):

LTC1442 series (CS8#PBF, CS8#TRPBF, IS8#PBF, IS8#TRPBF): CMOS/TTL output type instead of open-drain; extended output current capability (40mA typical); reduced operating temperature range (0°C ~ 70°C for commercial grade, -40°C ~ 85°C for industrial grade)
LTC1842 series (CS8#PBF, CS8#TRPBF, IS8#PBF, IS8#TRPBF): Open-drain output type matching; 5.7µA quiescent current; temperature-dependent variants

Parameter Comparison

Part Number	Manufacturer	Product Status	Output Type	Supply Voltage	Quiescent Current (Max)	Propagation Delay (Max)	Operating Temp	Packaging
MAX973ESA-T	Analog Devices/Maxim	Obsolete	Open-Drain	2.5V~11V / ±1.25V~5.5V	6µA	—	-40°C ~ 85°C	8-SOIC Tube
MAX973ESA+T	Analog Devices/Maxim	Active	Open-Drain	2.5V~11V / ±1.25V~5.5V	6µA	—	-40°C ~ 85°C	8-SOIC TR
LTC1843IS8#PBF	Analog Devices	Active	Open-Drain	2.5V~11V / ±1.25V~5.5V	5.7µA	12µs	-40°C ~ 85°C	8-SO Tube
LTC1843IS8#TRPBF	Analog Devices	Active	Open-Drain	2.5V~11V / ±1.25V~5.5V	5.7µA	12µs	-40°C ~ 85°C	8-SO TR
LTC1442CS8#PBF	Analog Devices	Active	CMOS/TTL	2V~11V / ±1V~5.5V	5.7µA	15µs	0°C ~ 70°C	8-SO Tube
LTC1442CS8#TRPBF	Analog Devices	Active	CMOS/TTL	2V~11V / ±1V~5.5V	5.7µA	15µs	0°C ~ 70°C	8-SO TR
LTC1442IS8#PBF	Analog Devices	Active	CMOS/TTL	2V~11V / ±1V~5.5V	5.7µA	15µs	-40°C ~ 85°C	8-SO Tube
LTC1442IS8#TRPBF	Analog Devices	Active	CMOS/TTL	2V~11V / ±1V~5.5V	5.7µA	15µs	-40°C ~ 85°C	8-SO TR
LTC1842CS8#PBF	Analog Devices	Active	Open-Drain	2.5V~11V / ±1.25V~5.5V	5.7µA	12µs	0°C ~ 70°C	8-SO Tube
LTC1842CS8#TRPBF	Analog Devices	Active	Open-Drain	2.5V~11V / ±1.25V~5.5V	5.7µA	12µs	0°C ~ 70°C	8-SO TR
LTC1842IS8#PBF	Analog Devices	Active	Open-Drain	2.5V~11V / ±1.25V~5.5V	5.7µA	12µs	-40°C ~ 85°C	8-SO Tube
LTC1842IS8#TRPBF	Analog Devices	Active	Open-Drain	2.5V~11V / ±1.25V~5.5V	5.7µA	12µs	-40°C ~ 85°C	8-SO TR

Engineering Selection Recommendations

Tier 1 - Direct Replacement (Recommended): MAX973ESA+T is the primary substitute. This part maintains identical electrical specifications and operating temperature range (-40°C ~ 85°C) while offering active product status and improved availability. The only difference is packaging format (tape & reel vs. tube), which does not affect electrical performance.

Tier 2 - Functional Equivalents (Open-Drain Output): LTC1843IS8#PBF and LTC1843IS8#TRPBF provide open-drain output matching with identical supply voltage and hysteresis specifications. These parts feature 5.7µA quiescent current (slightly lower than the original 6µA) and documented 12µs propagation delay. Both maintain -40°C ~ 85°C operating temperature range and ROHS3 compliance.

LTC1842 series (IS8 variants) also provide open-drain output with -40°C ~ 85°C temperature range. The CS8 variants operate at reduced temperature range (0°C ~ 70°C) and are suitable only for commercial-grade applications.

Tier 3 - Functional Alternatives (CMOS/TTL Output): LTC1442 series parts feature CMOS/TTL output instead of open-drain. These are suitable only when the application circuit can accommodate push-pull output topology. Industrial-grade variants (IS8) maintain -40°C ~ 85°C operating temperature. Commercial-grade variants (CS8) are limited to 0°C ~ 70°C and are not suitable for extended temperature applications.

All substitute parts maintain ROHS3 compliance, MSL Level 1, and identical package footprint (8-SOIC, 0.154" width).

Frequently Asked Questions (FAQ)

Q: Can MAX973ESA+T be used as a direct replacement for MAX973ESA-T? A: Yes. MAX973ESA+T is electrically identical to MAX973ESA-T with matching supply voltage range, output type, quiescent current, and operating temperature. The only difference is packaging format (tape & reel). Both are ROHS3 compliant with MSL Level 1.

Q: What is the difference between open-drain and CMOS/TTL output types? A: Open-drain output (MAX973ESA-T, LTC1843, LTC1842 series) requires external pull-up resistor and can only sink current. CMOS/TTL output (LTC1442 series) provides active push-pull output with 40mA typical output current capability. Circuit redesign is required to use CMOS/TTL variants.

Q: Are LTC1843 and LTC1842 parts interchangeable with MAX973ESA-T? A: LTC1843IS8 variants are direct functional equivalents with identical electrical specifications and -40°C ~ 85°C operating range. LTC1842IS8 variants also match these criteria. Both maintain open-drain output and ROHS3 compliance. Packaging differences (8-SO vs. 8-SOIC) are mechanically compatible on standard PCB layouts.

Q: Why do some LTC1442 parts have 0°C ~ 70°C operating temperature instead of -40°C ~ 85°C? A: LTC1442CS8 variants are commercial-grade parts with reduced temperature range. LTC1442IS8 variants are industrial-grade with extended -40°C ~ 85°C range. Select IS8 variants for applications requiring full industrial temperature operation.

Q: What is the significance of the "#PBF" and "#TRPBF" suffixes? A: "#PBF" indicates tube packaging; "#TRPBF" indicates tape & reel packaging. Both formats contain identical die and electrical specifications. Tape & reel packaging is preferred for automated assembly; tube packaging is suitable for manual assembly or lower-volume applications.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts (MAX973ESA+T, LTC1843, LTC1442, LTC1842 series) are ROHS3 compliant with MSL Level 1 (unlimited moisture sensitivity).

Q: What is the quiescent current difference between MAX973ESA-T (6µA) and LTC1843/LTC1842 (5.7µA)? A: The 0.3µA difference is negligible for most applications. LTC variants offer slightly lower power consumption. Both values are within typical design margins for low-power comparator applications.

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