MAX983CSA Equivalent & Substitute Parts

Part Overview

The MAX983CSA is a dual comparator with integrated voltage reference in 8-SOIC surface mount packaging, manufactured by Analog Devices Inc./Maxim Integrated. This device operates across single supply (2.5V to 11V) and dual supply (±1.25V to ±5.5V) configurations with 50mV hysteresis and 80dB CMRR/PSRR performance. The MAX983CSA is classified as obsolete, making equivalent and substitute parts necessary for ongoing production and design continuity. Direct substitutes and upgrades are available from the same manufacturer with identical or enhanced electrical characteristics and improved product status.

Key Parameters

Parameter	Value
Voltage Supply Range (Single/Dual)	2.5V ~ 11V, ±1.25V ~ 5.5V
Input Offset Voltage (Max)	10mV @ 5V
Quiescent Current (Max)	6µA
CMRR / PSRR (Typical)	80dB / 80dB
Hysteresis	50mV
Operating Temperature	0°C ~ 70°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Number of Elements	2
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the MAX983CSA is determined by strict equivalence across the following critical parameters: supply voltage range, input offset voltage, hysteresis, CMRR/PSRR performance, package type (8-SOIC), and operating temperature range. All substitute parts maintain identical electrical specifications within the 0°C to 70°C operating window or extend to -40°C to 85°C for upgraded variants.

The substitute parts are categorized as follows:

Direct Equivalent (Same Base Product): MAX983CSA+ maintains identical specifications with active product status and tube packaging.

Functional Equivalents (LTC1843 Series): LTC1843CS8#PBF and LTC1843CS8#TRPBF provide identical electrical performance with open-drain output configuration and active status. These are available in tube and tape & reel packaging.

Upgraded Variants (Extended Temperature): LTC1843IS8#PBF and LTC1843IS8#TRPBF extend the operating temperature range to -40°C to 85°C while maintaining all other electrical parameters, available in tube and tape & reel formats.

Manufacturer Recommended Alternatives (LTC1842 Series): LTC1842CS8#PBF, LTC1842CS8#TRPBF, LTC1842IS8#PBF, and LTC1842IS8#TRPBF provide equivalent performance with open-drain output and are designated as manufacturer-recommended substitutes. The LTC1842I variants extend temperature range to -40°C to 85°C.

All substitute parts share the same 8-SOIC package footprint, surface mount configuration, RoHS3 compliance, and MSL-1 rating.

Parameter Comparison

Part Number	Manufacturer	Product Status	Packaging	Output Type	Quiescent Current (Max)	Propagation Delay (Max)	Operating Temperature	Inventory (Pcs)
MAX983CSA	Analog Devices Inc./Maxim Integrated	Obsolete	Tube	Standard	6µA	—	0°C ~ 70°C	3800
MAX983CSA+	Analog Devices Inc./Maxim Integrated	Active	Tube	Standard	6µA	—	0°C ~ 70°C	1471
LTC1843CS8#PBF	Analog Devices Inc.	Active	Tube	Open-Drain	5.7µA	12µs	0°C ~ 70°C	2006
LTC1843CS8#TRPBF	Analog Devices Inc.	Active	Tape & Reel	Open-Drain	5.7µA	12µs	0°C ~ 70°C	3838
LTC1843IS8#PBF	Analog Devices Inc.	Active	Tube	Open-Drain	5.7µA	12µs	-40°C ~ 85°C	2700
LTC1843IS8#TRPBF	Analog Devices Inc.	Active	Tape & Reel	Open-Drain	5.7µA	12µs	-40°C ~ 85°C	6023
LTC1842CS8#PBF	Analog Devices Inc.	Active	Tube	Open-Drain	5.7µA	12µs	0°C ~ 70°C	1239
LTC1842CS8#TRPBF	Analog Devices Inc.	Active	Tape & Reel	Open-Drain	5.7µA	12µs	0°C ~ 70°C	2352
LTC1842IS8#PBF	Analog Devices Inc.	Active	Tube	Open-Drain	5.7µA	12µs	-40°C ~ 85°C	2994
LTC1842IS8#TRPBF	Analog Devices Inc.	Active	Tape & Reel	Open-Drain	5.7µA	12µs	-40°C ~ 85°C	8502

Engineering Selection Recommendations

For Direct Replacement (Same Temperature Range): Select MAX983CSA+ for immediate drop-in compatibility. This part maintains active product status and identical electrical specifications within the 0°C to 70°C operating window. Tube packaging is standard for both the original and direct equivalent.

For Extended Temperature Applications: Choose LTC1843IS8#PBF, LTC1843IS8#TRPBF, LTC1842IS8#PBF, or LTC1842IS8#TRPBF when designs require operation across -40°C to 85°C. These upgrades provide enhanced temperature performance while maintaining all core electrical parameters. Select tape & reel variants for high-volume production; tube packaging for lower quantities.

For Manufacturer-Recommended Substitutes: The LTC1842 and LTC1843 series are designated as manufacturer-recommended alternatives. Both series feature open-drain output configuration and active product status. LTC1842 variants are the primary manufacturer recommendation; LTC1843 variants provide equivalent performance with cross-compatibility.

Compliance and Certifications: All substitute parts maintain ROHS3 compliance, REACH unaffected status, and MSL-1 moisture sensitivity rating, ensuring regulatory and environmental compatibility with the original MAX983CSA specification.

Packaging Selection: Tube packaging (suffix #PBF) is appropriate for prototype and low-volume applications. Tape & reel packaging (suffix #TRPBF) is standard for automated assembly and production quantities.

Frequently Asked Questions (FAQ)

Q: Can MAX983CSA+ be used as a direct replacement for MAX983CSA?

A: Yes. MAX983CSA+ is the direct equivalent with identical electrical specifications, 8-SOIC package, and surface mount configuration. The primary difference is active product status versus obsolete status. Tube packaging is consistent between both parts.

Q: What is the difference between LTC1843 and LTC1842 series substitutes?

A: Both series provide equivalent electrical performance and are manufacturer-recommended substitutes. The primary distinction is internal architecture and cross-compatibility with other device families. Both feature open-drain output, identical supply voltage ranges, hysteresis, and CMRR/PSRR specifications. Selection between series depends on design requirements and availability.

Q: Why do LTC1843IS8 and LTC1842IS8 variants have extended temperature ranges?

A: The "I" temperature grade designation indicates industrial-grade operating range (-40°C to 85°C) versus commercial grade (0°C to 70°C). These variants are upgrades suitable for applications requiring broader temperature performance while maintaining all other electrical parameters.

Q: Are open-drain output variants compatible with the MAX983CSA standard output?

A: Open-drain output requires external pull-up resistors for proper operation. If the original design uses standard output without pull-up resistors, open-drain variants (LTC1843 and LTC1842 series) require circuit modification. Verify output stage requirements before selection.

Q: What packaging format should be selected for production?

A: Tube packaging (#PBF suffix) is suitable for prototype, repair, and low-volume applications. Tape & reel packaging (#TRPBF suffix) is standard for automated pick-and-place assembly and high-volume production. Both formats use identical 8-SOIC footprints and are interchangeable at the component level.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and REACH unaffected status, matching the environmental and regulatory requirements of the original MAX983CSA specification.

Q: What is the significance of the "+" suffix in MAX983CSA+?

A: The "+" suffix indicates an updated version with active product status and improved availability. Electrical specifications remain identical to the original MAX983CSA. The "+" designation reflects manufacturing and distribution updates without functional changes.

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