MAX973CSA+ Equivalent & Substitute Parts

Part Overview

The MAX973CSA+ is a dual-channel comparator with integrated voltage reference and open-drain output, manufactured by Analog Devices Inc./Maxim Integrated. This linear IC operates across single supply (2.5V to 11V) and dual supply (±1.25V to 5.5V) configurations, making it suitable for precision measurement and signal conditioning applications. The device is in active production status with ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1). Substitute parts are identified based on matching electrical specifications, package compatibility, and operational temperature ranges to ensure direct circuit board replacement capability.

Key Parameters

Parameter	Value
Part Number	MAX973CSA+
Manufacturer	Analog Devices Inc./Maxim Integrated
Category	Linear - Comparator
Type	Comparator with Voltage Reference
Number of Elements	2
Output Type	Open-Drain
Supply Voltage (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	0°C ~ 70°C
Package	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the MAX973CSA+ is determined by the following critical parameters:

Electrical Compatibility Requirements:

Dual-channel comparator with integrated voltage reference
Open-drain output configuration
Supply voltage range: 2.5V ~ 11V (single) / ±1.25V ~ 5.5V (dual)
Input offset voltage maximum: 10mV @ 5V
Quiescent current maximum: 6µA or lower
CMRR and PSRR: 80dB minimum
Hysteresis: 50mV
Operating temperature: 0°C ~ 70°C minimum

Package and Mechanical Requirements:

8-SOIC package (0.154", 3.90mm width)
Surface mount configuration
Tube or Tape & Reel packaging options

Compliance Requirements:

ROHS3 compliant
MSL 1 rating
Active product status

The substitute parts listed below meet all electrical specifications and package requirements. Variants include different temperature grades (commercial 0°C ~ 70°C vs. industrial -40°C ~ 85°C) and packaging formats (Tube vs. Tape & Reel). Industrial-grade variants (LTC1843IS8#PBF, LTC1843IS8#TRPBF, LTC1842IS8#PBF, LTC1842IS8#TRPBF) provide extended temperature operation and are direct upgrades for applications requiring wider operating ranges.

Parameter Comparison

Part Number	Manufacturer	Type	Elements	Output	Supply Voltage	Input Offset (Max)	Quiescent Current (Max)	CMRR/PSRR	Hysteresis	Temp Range	Package	Packaging
MAX973CSA+	Analog Devices/Maxim	w/ Voltage Ref	2	Open-Drain	2.5V~11V / ±1.25V~5.5V	10mV @ 5V	6µA	80dB/80dB	50mV	0°C ~ 70°C	8-SOIC	Tube
LTC1843CS8#PBF	Analog Devices	w/ Voltage Ref	2	Open-Drain	2.5V~11V / ±1.25V~5.5V	10mV @ 5V	5.7µA	80dB/80dB	50mV	0°C ~ 70°C	8-SOIC	Tube
LTC1843CS8#TRPBF	Analog Devices	w/ Voltage Ref	2	Open-Drain	2.5V~11V / ±1.25V~5.5V	10mV @ 5V	5.7µA	80dB/80dB	50mV	0°C ~ 70°C	8-SOIC	Tape & Reel
LTC1843IS8#PBF	Analog Devices	w/ Voltage Ref	2	Open-Drain	2.5V~11V / ±1.25V~5.5V	10mV @ 5V	5.7µA	80dB/80dB	50mV	-40°C ~ 85°C	8-SOIC	Tube
LTC1843IS8#TRPBF	Analog Devices	w/ Voltage Ref	2	Open-Drain	2.5V~11V / ±1.25V~5.5V	10mV @ 5V	5.7µA	80dB/80dB	50mV	-40°C ~ 85°C	8-SOIC	Tape & Reel
LTC1842CS8#PBF	Analog Devices	w/ Voltage Ref	2	Open-Drain	2.5V~11V / ±1.25V~5.5V	10mV @ 5V	5.7µA	80dB/80dB	50mV	0°C ~ 70°C	8-SOIC	Tube
LTC1842CS8#TRPBF	Analog Devices	w/ Voltage Ref	2	Open-Drain	2.5V~11V / ±1.25V~5.5V	10mV @ 5V	5.7µA	80dB/80dB	50mV	0°C ~ 70°C	8-SOIC	Tape & Reel
LTC1842IS8#PBF	Analog Devices	w/ Voltage Ref	2	Open-Drain	2.5V~11V / ±1.25V~5.5V	10mV @ 5V	5.7µA	80dB/80dB	50mV	-40°C ~ 85°C	8-SOIC	Tube
LTC1842IS8#TRPBF	Analog Devices	w/ Voltage Ref	2	Open-Drain	2.5V~11V / ±1.25V~5.5V	10mV @ 5V	5.7µA	80dB/80dB	50mV	-40°C ~ 85°C	8-SOIC	Tape & Reel

Engineering Selection Recommendations

Direct Substitutes (Same Temperature Grade): LTC1843CS8#PBF, LTC1843CS8#TRPBF, LTC1842CS8#PBF, and LTC1842CS8#TRPBF are functionally equivalent to MAX973CSA+ within the 0°C to 70°C operating range. These parts maintain identical electrical specifications and package configuration. Selection between Tube and Tape & Reel packaging depends on assembly process requirements and volume considerations. All parts carry ROHS3 compliance and MSL 1 rating.

Upgraded Substitutes (Extended Temperature Grade): LTC1843IS8#PBF, LTC1843IS8#TRPBF, LTC1842IS8#PBF, and LTC1842IS8#TRPBF extend the operating temperature range to -40°C to 85°C while maintaining all electrical specifications. These industrial-grade variants are direct upgrades suitable for applications requiring wider temperature operation. Quiescent current remains at 5.7µA, meeting or exceeding the 6µA maximum specification of the original part.

Compliance and Certification: All substitute parts maintain ROHS3 compliance, MSL 1 rating, and active product status. No additional qualification or testing is required for direct substitution within the specified electrical and thermal operating ranges.

Frequently Asked Questions (FAQ)

Q: Can LTC1843 and LTC1842 series parts be used interchangeably with MAX973CSA+? A: Yes. Both LTC1843 and LTC1842 series meet all electrical specifications, package requirements, and compliance standards of the MAX973CSA+. Selection is based on temperature grade and packaging format requirements.

Q: What is the difference between commercial (C) and industrial (I) temperature grades? A: Commercial-grade parts (CS8) operate from 0°C to 70°C. Industrial-grade parts (IS8) operate from -40°C to 85°C. Both meet the electrical specifications of the original part. Industrial grades are suitable for extended temperature applications.

Q: Does packaging format (Tube vs. Tape & Reel) affect electrical performance? A: No. Tube and Tape & Reel packaging formats contain identical die and electrical characteristics. Selection depends on assembly process compatibility and volume requirements. Tube packaging is typical for lower volumes; Tape & Reel is standard for automated assembly.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts carry ROHS3 compliance and MSL 1 rating, matching the environmental and regulatory status of the MAX973CSA+.

Q: What is the propagation delay specification for substitute parts? A: Propagation delay is specified as 12µs typical for LTC1842 and LTC1843 series parts. This parameter was not provided for the original MAX973CSA+ in the reference data.

Q: Can I use an industrial-grade part (IS8) in an application designed for commercial-grade (CS8)? A: Yes. Industrial-grade parts are direct upgrades with extended temperature capability. They maintain all electrical specifications and are pin-compatible. No circuit modifications are required.

Q: What inventory levels are available for these substitute parts? A: Current inventory includes: LTC1843CS8#PBF (2006 pcs), LTC1843CS8#TRPBF (3838 pcs), LTC1843IS8#PBF (2700 pcs), LTC1843IS8#TRPBF (6023 pcs), LTC1842CS8#PBF (1239 pcs), LTC1842CS8#TRPBF (2352 pcs), LTC1842IS8#PBF (2994 pcs), and LTC1842IS8#TRPBF (8502 pcs).

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