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MAX923CSA-T Equivalent & Substitute Parts
Part Overview
The MAX923CSA-T is a dual comparator with integrated voltage reference manufactured by Analog Devices Inc./Maxim Integrated. This device features CMOS and TTL output stages in an 8-SOIC surface mount package. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.
The MAX923CSA-T 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 a propagation delay of 12µs. The 50mV hysteresis and 80dB CMRR/PSRR specifications support precision analog comparison applications.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | MAX923CSA-T |
| Manufacturer | Analog Devices Inc./Maxim Integrated |
| Product Category | Linear - Comparator with Voltage Reference |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) |
| Number of Elements | 2 |
| Output Type | CMOS, TTL |
| Voltage - Supply, Single/Dual (±) | 2.5V ~ 11V, ±1.25V ~ 5.5V |
| Voltage - Input Offset (Max) | 10mV @ 5V |
| Current - Output (Typ) | 50mA |
| Current - Quiescent (Max) | 7.5µA |
| CMRR, PSRR (Typ) | 80dB CMRR, 80dB PSRR |
| Propagation Delay (Max) | 12µs |
| Hysteresis | 50mV |
| Operating Temperature | 0°C ~ 70°C |
| Mounting Type | Surface Mount |
| Product Status | Obsolete |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution eligibility for the MAX923CSA-T is determined by the following critical parameters:
Primary Substitution Criteria:
- Package type: 8-SOIC surface mount form factor
- Functional type: Dual comparator with integrated voltage reference
- Output stage configuration: CMOS and TTL compatible outputs
- Supply voltage range: Minimum 2.5V single supply or ±1.25V dual supply capability
- Key electrical specifications: Input offset voltage ≤10mV @ 5V, propagation delay ≤12µs, hysteresis 50mV
Substitute Categories:
Category 1 - Direct Packaging Equivalent (Active Status) MAX923CSA+T represents the active production equivalent with identical electrical specifications and Tape & Reel packaging. This part maintains full compatibility with the obsolete MAX923CSA-T.
Category 2 - LTC1442 Series (CMOS/TTL Output, Active Status) The LTC1442CS8#PBF, LTC1442CS8#TRPBF, LTC1442IS8#PBF, and LTC1442IS8#TRPBF variants provide dual comparator functionality with CMOS and TTL outputs. These parts operate within the required supply voltage range (2V ~ 11V single, ±1V ~ 5.5V dual) and maintain the 50mV hysteresis specification. The LTC1442 series exhibits slightly higher propagation delay (15µs maximum) and lower quiescent current (5.7µA) compared to the MAX923CSA-T. Temperature-rated variants (IS8) extend operating range to -40°C ~ 85°C.
Category 3 - LTC1843 Series (Open-Drain Output, Active Status) The LTC1843CS8#PBF, LTC1843CS8#TRPBF, LTC1843IS8#PBF, and LTC1843IS8#TRPBF variants provide dual comparator functionality with open-drain output configuration. These parts maintain identical supply voltage range (2.5V ~ 11V single, ±1.25V ~ 5.5V dual), input offset voltage (10mV @ 5V), propagation delay (12µs), and hysteresis (50mV) specifications. The open-drain output differs from the CMOS/TTL output of the MAX923CSA-T, requiring external pull-up resistors for TTL-level output generation. Temperature-rated variants (IS8) extend operating range to -40°C ~ 85°C.
Parameter Comparison
| Parameter | MAX923CSA-T | MAX923CSA+T | LTC1442CS8#PBF | LTC1442CS8#TRPBF | LTC1442IS8#PBF | LTC1442IS8#TRPBF | LTC1843CS8#PBF | LTC1843CS8#TRPBF | LTC1843IS8#PBF | LTC1843IS8#TRPBF |
|---|---|---|---|---|---|---|---|---|---|---|
| Manufacturer | Analog Devices Inc./Maxim Integrated | Analog Devices Inc./Maxim Integrated | Analog Devices Inc. | Analog Devices Inc. | Analog Devices Inc. | Analog Devices Inc. | Analog Devices Inc. | Analog Devices Inc. | Analog Devices Inc. | Analog Devices Inc. |
| Package / Case | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC |
| Number of Elements | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 |
| Output Type | CMOS, TTL | CMOS, TTL | CMOS, TTL | CMOS, TTL | CMOS, TTL | CMOS, TTL | Open-Drain | Open-Drain | Open-Drain | Open-Drain |
| Voltage - Supply, Single (V) | 2.5 ~ 11 | 2.5 ~ 11 | 2 ~ 11 | 2 ~ 11 | 2 ~ 11 | 2 ~ 11 | 2.5 ~ 11 | 2.5 ~ 11 | 2.5 ~ 11 | 2.5 ~ 11 |
| Voltage - Supply, Dual (±V) | ±1.25 ~ 5.5 | ±1.25 ~ 5.5 | ±1 ~ 5.5 | ±1 ~ 5.5 | ±1 ~ 5.5 | ±1 ~ 5.5 | ±1.25 ~ 5.5 | ±1.25 ~ 5.5 | ±1.25 ~ 5.5 | ±1.25 ~ 5.5 |
| Voltage - Input Offset (Max) @ 5V | 10mV | 10mV | 10mV | 10mV | 10mV | 10mV | 10mV | 10mV | 10mV | 10mV |
| Current - Output (Typ) | 50mA | 50mA | 40mA | 40mA | 40mA | 40mA | — | — | — | — |
| Current - Quiescent (Max) | 7.5µA | 7.5µA | 5.7µA | 5.7µA | 5.7µA | 5.7µA | 5.7µA | 5.7µA | 5.7µA | 5.7µA |
| CMRR, PSRR (Typ) | 80dB CMRR, 80dB PSRR | 80dB CMRR, 80dB PSRR | 80dB CMRR, 80dB PSRR | 80dB CMRR, 80dB PSRR | 80dB CMRR, 80dB PSRR | 80dB CMRR, 80dB PSRR | 80dB CMRR, 80dB PSRR | 80dB CMRR, 80dB PSRR | 80dB CMRR, 80dB PSRR | 80dB CMRR, 80dB PSRR |
| Propagation Delay (Max) | 12µs | 12µs | 15µs | 15µs | 15µs | 15µs | 12µs | 12µs | 12µs | 12µs |
| Hysteresis | 50mV | 50mV | 50mV | 50mV | 50mV | 50mV | 50mV | 50mV | 50mV | 50mV |
| Operating Temperature | 0°C ~ 70°C | 0°C ~ 70°C | 0°C ~ 70°C | 0°C ~ 70°C | -40°C ~ 85°C | -40°C ~ 85°C | 0°C ~ 70°C | 0°C ~ 70°C | -40°C ~ 85°C | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
| Product Status | Obsolete | Active | Active | Active | Active | Active | Active | Active | Active | Active |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) |
Engineering Selection Recommendations
Primary Selection: MAX923CSA+T
The MAX923CSA+T is the recommended direct replacement for the obsolete MAX923CSA-T. This part maintains identical electrical specifications, supply voltage range, output configuration, and operating temperature range. The only difference is packaging format (Tape & Reel versus tube), which does not affect functional compatibility. Both parts carry Active product status and ROHS3 compliance.
Secondary Selection: LTC1843 Series (LTC1843CS8#PBF, LTC1843CS8#TRPBF, LTC1843IS8#PBF, LTC1843IS8#TRPBF)
The LTC1843 series provides functional equivalence with identical propagation delay (12µs) and supply voltage specifications matching the MAX923CSA-T. The open-drain output configuration requires external pull-up resistors to generate TTL-level outputs, introducing a circuit design modification. All variants carry Active product status and ROHS3 compliance. Temperature-rated IS8 variants extend operating range to -40°C ~ 85°C for applications requiring extended temperature performance.
Tertiary Selection: LTC1442 Series (LTC1442CS8#PBF, LTC1442CS8#TRPBF, LTC1442IS8#PBF, LTC1442IS8#TRPBF)
The LTC1442 series maintains CMOS and TTL output compatibility with the MAX923CSA-T. These parts exhibit slightly reduced propagation delay specification (15µs maximum versus 12µs) and lower quiescent current (5.7µA versus 7.5µA). The supply voltage range is marginally reduced at the lower end (2V minimum single supply versus 2.5V). All variants carry Active product status and ROHS3 compliance. Temperature-rated IS8 variants extend operating range to -40°C ~ 85°C.
All substitute parts maintain ROHS3 compliance, MSL Level 1 rating, and surface mount 8-SOIC packaging compatibility with the original MAX923CSA-T design.
Frequently Asked Questions (FAQ)
Q: Can MAX923CSA+T be used as a direct replacement for MAX923CSA-T?
A: Yes. The MAX923CSA+T provides identical electrical specifications, supply voltage range (2.5V ~ 11V single, ±1.25V ~ 5.5V dual), output configuration (CMOS/TTL), and operating temperature range (0°C ~ 70°C). The difference in packaging format (Tape & Reel) does not affect functional compatibility.
Q: What is the key difference between LTC1442 and LTC1843 series substitutes?
A: The LTC1442 series provides CMOS and TTL output stages, matching the MAX923CSA-T output configuration. The LTC1843 series uses open-drain outputs, requiring external pull-up resistors to generate TTL-level signals. Both series maintain the 50mV hysteresis and 80dB CMRR/PSRR specifications.
Q: Does the LTC1442 series propagation delay difference affect compatibility?
A: The LTC1442 series specifies a maximum propagation delay of 15µs compared to 12µs for the MAX923CSA-T. This 3µs difference may impact timing-critical applications. Verify propagation delay requirements in your specific circuit before selection.
Q: Are temperature-rated variants (IS8) compatible with standard commercial-grade designs?
A: Temperature-rated IS8 variants extend operating range to -40°C ~ 85°C, compared to 0°C ~ 70°C for standard CS8 variants. IS8 parts are fully compatible with commercial-grade designs and provide additional temperature margin. No circuit modifications are required.
Q: What packaging options are available for substitute parts?
A: All substitute parts are available in 8-SOIC surface mount packages. Packaging variants include Tube (standard reel packaging) and Tape & Reel (TR) formats for automated assembly. Both formats maintain identical electrical specifications and physical dimensions.
Q: Are all substitute parts ROHS3 compliant?
A: Yes. All substitute parts listed—MAX923CSA+T, LTC1442 series, and LTC1843 series—carry ROHS3 compliance certification and MSL Level 1 moisture sensitivity rating, matching the original MAX923CSA-T specifications.
Q: Can LTC1843 open-drain outputs be used in place of CMOS/TTL outputs?
A: Open-drain outputs require external pull-up resistors to generate logic-level signals. If your circuit design includes pull-up resistors or is compatible with open-drain logic, LTC1843 substitution is viable. If your design expects direct CMOS/TTL output levels without external pull-ups, use MAX923CSA+T or LTC1442 series instead.
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