MAX923CSA Equivalent & Substitute Parts

Part Overview

The MAX923CSA is a dual comparator with integrated voltage reference, manufactured by Analog Devices Inc./Maxim Integrated. This CMOS/TTL output comparator operates across single supply (2.5V ~ 11V) and dual supply (±1.25V ~ 5.5V) configurations with 50mV hysteresis and 12µs propagation delay. The part is classified as obsolete, making equivalent substitutes necessary for new designs and ongoing production support. Substitute parts maintain functional equivalence while offering active product status and improved compliance certifications.

Substiute Parts

MAX923CSA

Analog Devices Inc./Maxim IntegratedIn Stock: 3677MAX923CSA Datasheet

Current PartRFQ

MAX923CSA+

Analog Devices Inc./Maxim IntegratedIn Stock: 2257MAX923CSA+ Datasheet

DirectRFQ

LTC1441CS8#PBF

Analog Devices Inc.In Stock: 1381LTC1441CS8#PBF Datasheet

MFR RecommendedRFQ

LTC1442CS8#PBF

Analog Devices Inc.In Stock: 2141LTC1442CS8#PBF Datasheet

MFR RecommendedRFQ

LTC1442CS8#TRPBF

Analog Devices Inc.In Stock: 3163LTC1442CS8#TRPBF Datasheet

MFR RecommendedRFQ

LTC1442IS8#PBF

Analog Devices Inc.In Stock: 2081LTC1442IS8#PBF Datasheet

MFR RecommendedRFQ

LTC1442IS8#TRPBF

Analog Devices Inc.In Stock: 1454LTC1442IS8#TRPBF Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following critical parameters:

• Functional Type: Comparator with voltage reference (primary criterion)
• Number of Elements: 2 comparators per package
• Output Type: CMOS/TTL compatible outputs
• Supply Voltage Range: Minimum overlap with 2.5V ~ 11V single supply and ±1.25V ~ 5.5V dual supply
• Input Offset Voltage: Maximum 10mV @ 5V
• Hysteresis: 50mV (required for voltage reference comparators)
• Package: 8-SOIC surface mount form factor
• Operating Temperature: 0°C ~ 70°C minimum range

Substitute parts are grouped into two categories:

Category 1: Direct Packaging Variants (MAX923CSA+) MAX923CSA+ maintains identical electrical specifications and differs only in packaging format (Tube vs. standard packaging) and product status (Active vs. Obsolete).

Category 2: Functional Equivalents (LTC1442 Series) LTC1442CS8#PBF, LTC1442CS8#TRPBF, LTC1442IS8#PBF, and LTC1442IS8#TRPBF provide functional equivalence with minor parameter variations within acceptable engineering tolerances. These parts maintain the voltage reference comparator architecture, dual-element configuration, CMOS/TTL output, 50mV hysteresis, and 8-SOIC package. Supply voltage range is slightly reduced (2V ~ 11V vs. 2.5V ~ 11V), and propagation delay is marginally increased (15µs vs. 12µs). The LTC1442IS8 variants support extended industrial temperature range (-40°C ~ 85°C).

Category 3: General Purpose Alternative (LTC1441CS8#PBF) LTC1441CS8#PBF is a general-purpose dual comparator without integrated voltage reference. This part shares the same package, output type, and supply voltage specifications but lacks the 50mV hysteresis and voltage reference functionality. Selection requires application-level assessment of voltage reference necessity.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Preferred) MAX923CSA+ is the primary substitute, offering identical electrical specifications and active product status. This part eliminates obsolescence risk while maintaining full functional compatibility. ROHS3 compliance improves supply chain sustainability and regulatory alignment.

For Active Production Designs LTC1442CS8#PBF or LTC1442CS8#TRPBF are recommended for new designs requiring commercial temperature range (0°C ~ 70°C). These parts provide active product status, ROHS3 compliance, and proven long-term availability. The 3µs increase in propagation delay and 10mA reduction in output current are acceptable for most comparator applications. Tube packaging (CS8#PBF) suits lower-volume requirements; Tape & Reel packaging (CS8#TRPBF) supports high-volume manufacturing.

For Extended Temperature Applications LTC1442IS8#PBF or LTC1442IS8#TRPBF extend operating range to -40°C ~ 85°C, supporting industrial and automotive environments. These variants maintain all other electrical specifications of the LTC1442 series while providing enhanced temperature performance.

For General-Purpose Comparator Applications LTC1441CS8#PBF substitutes when integrated voltage reference is not required. This part reduces quiescent current (5.7µA vs. 7.5µA) and output current (40mA vs. 50mA), benefiting power-constrained designs. Applications must not depend on 50mV hysteresis or voltage reference functionality.

All substitute parts carry ROHS3 compliance and REACH Unaffected status, supporting modern regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can MAX923CSA be directly replaced with MAX923CSA+? A: Yes. MAX923CSA+ is electrically and functionally identical, differing only in packaging format and product status. MAX923CSA+ is active and ROHS3 compliant, making it the preferred direct replacement.

Q: What is the key difference between LTC1442 and LTC1441 comparators? A: LTC1442 includes integrated voltage reference with 50mV hysteresis; LTC1441 is a general-purpose comparator without voltage reference. Selection depends on whether the application requires the voltage reference function.

Q: Are LTC1442CS8 and LTC1442IS8 interchangeable? A: Both share identical electrical specifications and package. The primary difference is operating temperature range: CS8 operates 0°C ~ 70°C (commercial), while IS8 operates -40°C ~ 85°C (industrial). Select based on application temperature requirements.

Q: What is the difference between Tube and Tape & Reel packaging? A: Tube packaging (CS8#PBF, IS8#PBF) suits lower-volume orders and manual assembly. Tape & Reel packaging (CS8#TRPBF, IS8#TRPBF) supports automated pick-and-place assembly for high-volume production. Electrical specifications are identical.

Q: Will the 3µs increase in propagation delay (12µs to 15µs) affect my circuit? A: Propagation delay impact depends on application timing requirements. For most comparator applications with response times in the millisecond range, 3µs difference is negligible. High-speed precision timing circuits should evaluate specific timing margins.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All substitute parts (MAX923CSA+, LTC1442 series, LTC1441CS8#PBF) are ROHS3 compliant. The original MAX923CSA is RoHS non-compliant, making substitution necessary for RoHS-regulated applications.

Q: Can I use LTC1442 in place of MAX923CSA in existing designs? A: LTC1442 provides functional equivalence with minor parameter variations (3µs additional propagation delay, 10mA lower output current, slightly reduced supply voltage minimum). Circuit validation is required to confirm timing and current drive specifications are met.