MAX973CSA-T Equivalent & Substitute Parts

Part Overview

The MAX973CSA-T is a dual comparator with integrated voltage reference and open-drain output, manufactured by Analog Devices Inc./Maxim Integrated. This 8-SOIC surface-mount device operates across a supply voltage range of 2.5V to 11V (single supply) or ±1.25V to 5.5V (dual supply), with a maximum input offset voltage of 10mV at 5V and 50mV hysteresis. The product is currently obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. Substitute parts maintain identical electrical performance and package compatibility while offering active product status and improved availability.

Substiute Parts

MAX973CSA-T

Analog Devices Inc./Maxim IntegratedIn Stock: 1182MAX973CSA-T Datasheet

Current PartRFQ

MAX973CSA+T

Analog Devices Inc./Maxim IntegratedIn Stock: 715MAX973CSA+T Datasheet

DirectRFQ

LTC1843CS8#PBF

Analog Devices Inc.In Stock: 2084LTC1843CS8#PBF Datasheet

DirectRFQ

LTC1843CS8#TRPBF

Analog Devices Inc.In Stock: 3872LTC1843CS8#TRPBF Datasheet

DirectRFQ

LTC1843IS8#PBF

Analog Devices Inc.In Stock: 2755LTC1843IS8#PBF Datasheet

UpgradeRFQ

LTC1843IS8#TRPBF

Analog Devices Inc.In Stock: 6091LTC1843IS8#TRPBF Datasheet

UpgradeRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the MAX973CSA-T is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Criteria:

• Dual comparator configuration with integrated voltage reference
• Open-drain output topology
• Supply voltage range: 2.5V ~ 11V (single) or ±1.25V ~ 5.5V (dual)
• Input offset voltage: 10mV @ 5V maximum
• Hysteresis: 50mV
• CMRR and PSRR: 80dB typical
• Common-mode input range compatibility

Mechanical & Package Equivalence Criteria:

• 8-SOIC package (0.154", 3.90mm width)
• Surface-mount technology
• Pin-compatible footprint

Compliance Equivalence Criteria:

• ROHS3 compliance
• MSL Level 1 (Unlimited)
• REACH unaffected status

Substitute parts are grouped into two categories: direct equivalents (identical base part number with different packaging) and upgraded variants (extended temperature range with identical electrical specifications).

Parameter Comparison

Engineering Selection Recommendations

Direct Equivalent (Same Base Part Number): MAX973CSA+T is the active-status equivalent of MAX973CSA-T. Both parts share identical electrical specifications and operate across the same temperature range (0°C ~ 70°C). The primary difference is packaging format: MAX973CSA+T is supplied in Tape & Reel format, while MAX973CSA-T was supplied in Tube format. Selection between these depends on production volume and assembly line requirements. Both maintain ROHS3 compliance and MSL Level 1 rating.

Upgraded Variants (Extended Temperature Range): LTC1843 series parts (LTC1843CS8#PBF, LTC1843CS8#TRPBF, LTC1843IS8#PBF, LTC1843IS8#TRPBF) provide identical electrical performance with extended operating temperature range (-40°C ~ 85°C for industrial-grade IS variants, 0°C ~ 70°C for commercial-grade CS variants). The LTC1843 base part number represents a functionally equivalent design from Analog Devices with slightly lower quiescent current (5.7µA vs. 6µA) and specified propagation delay (12µs). These parts are suitable for applications requiring wider temperature operation or where extended temperature margin is beneficial.

Packaging and Supply Format Considerations:

• Tube packaging (suffix #PBF): Suitable for lower-volume production and manual assembly
• Tape & Reel packaging (suffix #TRPBF): Required for automated pick-and-place assembly and high-volume production

All substitute parts maintain identical 8-SOIC package geometry, pin compatibility, and compliance certifications (ROHS3, MSL Level 1, REACH unaffected).

Frequently Asked Questions (FAQ)

Q: Can MAX973CSA+T be used as a direct replacement for MAX973CSA-T? A: Yes. MAX973CSA+T is electrically and mechanically identical to MAX973CSA-T. The only difference is packaging format (Tape & Reel vs. Tube). Both operate across 0°C ~ 70°C and maintain identical electrical specifications. Selection depends on assembly process requirements.

Q: What is the difference between LTC1843CS8 and LTC1843IS8 variants? A: The primary difference is operating temperature range. LTC1843CS8 operates across 0°C ~ 70°C (commercial grade), while LTC1843IS8 operates across -40°C ~ 85°C (industrial grade). Electrical specifications are identical. Select LTC1843IS8 for applications requiring extended temperature operation or wider temperature margin.

Q: Are LTC1843 parts pin-compatible with MAX973CSA-T? A: Yes. All LTC1843 variants maintain the same 8-SOIC package geometry and pin configuration as MAX973CSA-T. No PCB layout modifications are required for substitution.

Q: What is the significance of the #PBF and #TRPBF suffixes? A: #PBF indicates Tube packaging (plastic tube for manual handling and lower-volume assembly). #TRPBF indicates Tape & Reel packaging (automated reel format for high-volume production and pick-and-place assembly). Electrical performance is identical; selection depends on production volume and assembly equipment.

Q: Do all substitute parts maintain ROHS3 compliance? A: Yes. All listed substitute parts (MAX973CSA+T and all LTC1843 variants) are ROHS3 compliant with MSL Level 1 (Unlimited) moisture sensitivity rating. REACH status is unaffected for all parts.

Q: What is the quiescent current difference between MAX973CSA-T and LTC1843 parts? A: MAX973CSA-T specifies 6µA maximum quiescent current, while LTC1843 variants specify 5.7µA maximum. This 0.3µA difference is negligible for most applications and represents improved power efficiency in the LTC1843 design.

Q: Can I use LTC1843IS8#TRPBF in a design originally specified for MAX973CSA-T? A: Yes, with consideration for operating temperature. LTC1843IS8#TRPBF provides identical electrical performance and package compatibility. The extended temperature range (-40°C ~ 85°C vs. 0°C ~ 70°C) offers additional margin for applications operating outside the original specification range. No circuit modifications are required.