MAX973CSA Equivalent & Substitute Parts

Part Overview

The MAX973CSA is a dual 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) or dual supply (±1.25V to ±5.5V) configurations with 50mV hysteresis and 80dB CMRR/PSRR performance. The device is classified as obsolete, making equivalent and substitute parts necessary for ongoing production and design continuity. Substitute parts maintain identical electrical specifications and packaging while offering active product status and extended availability.

Key Parameters

Parameter	Value
Manufacturer	Analog Devices Inc./Maxim Integrated
Category	Linear - Comparator with Voltage Reference
Package / Case	8-SOIC (0.154", 3.90mm Width)
Number of Elements	2
Output Type	Open-Drain
Voltage Supply Range	2.5V ~ 11V (Single), ±1.25V ~ 5.5V (Dual)
Voltage - Input Offset (Max)	10mV @ 5V
Quiescent Current (Max)	6µA
CMRR / PSRR (Typ)	80dB / 80dB
Hysteresis	50mV
Operating Temperature	0°C ~ 70°C
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for MAX973CSA is determined by strict equivalence across the following electrical and mechanical parameters:

Dual comparator configuration with integrated voltage reference
Open-drain output topology
Identical supply voltage range: 2.5V ~ 11V (single) or ±1.25V ~ ±5.5V (dual)
Input offset voltage maximum: 10mV @ 5V
Quiescent current: 5.7µA to 6µA
CMRR and PSRR: 80dB minimum
Hysteresis: 50mV
8-SOIC package footprint (0.154", 3.90mm width)
Surface mount configuration
ROHS3 compliance and MSL 1 rating

Substitute parts are grouped by packaging format (Tube or Tape & Reel) and operating temperature range. Direct equivalents maintain 0°C ~ 70°C operation. Upgrade variants extend operating temperature to -40°C ~ 85°C, providing enhanced performance for wider environmental conditions.

Parameter Comparison

Part Number	Manufacturer	Product Status	Packaging	Operating Temp	Quiescent Current (Max)	Propagation Delay (Max)	Inventory (Pcs)
MAX973CSA	Analog Devices Inc./Maxim Integrated	Obsolete	-	0°C ~ 70°C	6µA	-	2965
MAX973CSA+	Analog Devices Inc./Maxim Integrated	Active	Tube	0°C ~ 70°C	6µA	-	1212
LTC1843CS8#PBF	Analog Devices Inc.	Active	Tube	0°C ~ 70°C	5.7µA	12µs	2006
LTC1843CS8#TRPBF	Analog Devices Inc.	Active	Tape & Reel (TR)	0°C ~ 70°C	5.7µA	12µs	3838
LTC1843IS8#PBF	Analog Devices Inc.	Active	Tube	-40°C ~ 85°C	5.7µA	12µs	2700
LTC1843IS8#TRPBF	Analog Devices Inc.	Active	Tape & Reel (TR)	-40°C ~ 85°C	5.7µA	12µs	6023
LTC1842CS8#PBF	Analog Devices Inc.	Active	Tube	0°C ~ 70°C	5.7µA	12µs	1239
LTC1842CS8#TRPBF	Analog Devices Inc.	Active	Tape & Reel (TR)	0°C ~ 70°C	5.7µA	12µs	2352
LTC1842IS8#PBF	Analog Devices Inc.	Active	Tube	-40°C ~ 85°C	5.7µA	12µs	2994
LTC1842IS8#TRPBF	Analog Devices Inc.	Active	Tape & Reel (TR)	-40°C ~ 85°C	5.7µA	12µs	8502

Engineering Selection Recommendations

All substitute parts listed maintain ROHS3 compliance and MSL 1 rating, ensuring regulatory and environmental compatibility with the original MAX973CSA specification.

For direct replacement in existing designs with 0°C ~ 70°C operating requirements, select MAX973CSA+ (active status, tube packaging) or LTC1843CS8#PBF / LTC1842CS8#PBF variants. These maintain identical temperature specifications and electrical performance.

For applications requiring extended temperature operation (-40°C ~ 85°C), LTC1843IS8#PBF, LTC1843IS8#TRPBF, LTC1842IS8#PBF, or LTC1842IS8#TRPBF provide upgrade capability with active product status and full availability.

Packaging selection between Tube and Tape & Reel (TR) depends on production volume and assembly process requirements. Tape & Reel variants offer higher inventory availability and are suitable for automated pick-and-place assembly.

Frequently Asked Questions (FAQ)

Q: Can MAX973CSA be directly replaced with MAX973CSA+? A: Yes. MAX973CSA+ is the active equivalent with identical electrical specifications, 8-SOIC package, and 0°C ~ 70°C operating range. The primary difference is product status (active vs. obsolete) and packaging format (tube).

Q: What is the difference between LTC1843 and LTC1842 series? A: Both LTC1843 and LTC1842 are functionally equivalent dual comparators with voltage reference and open-drain output. They share identical electrical parameters (5.7µA quiescent current, 12µs propagation delay, 50mV hysteresis) and 8-SOIC packaging. Selection between them depends on availability and supply chain requirements.

Q: Can I use LTC1843IS8#PBF in place of LTC1843CS8#PBF? A: Yes, with consideration for operating temperature. LTC1843IS8#PBF extends the operating range to -40°C ~ 85°C compared to LTC1843CS8#PBF (0°C ~ 70°C). All other electrical and mechanical parameters remain identical. Use the industrial-grade variant (IS8) if your application requires wider temperature operation.

Q: What does the "#PBF" and "#TRPBF" suffix indicate? A: "#PBF" indicates Tube packaging (plastic bag in tube). "#TRPBF" indicates Tape & Reel packaging with plastic bag. Both are standard packaging formats for surface-mount components. Tape & Reel is preferred for high-volume automated assembly.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts maintain ROHS3 compliance and MSL 1 (unlimited moisture sensitivity level), matching the original MAX973CSA specification.

Q: Which substitute offers the best availability? A: LTC1842IS8#TRPBF offers the highest inventory (8502 pcs) with active product status, extended temperature range (-40°C ~ 85°C), and Tape & Reel packaging suitable for production environments.

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