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MAX931CSA Equivalent & Substitute Parts
Part Overview
The MAX931CSA is a comparator with integrated voltage reference manufactured by Analog Devices Inc./Maxim Integrated. This linear IC operates as a single-element comparator with CMOS and TTL output capability in an 8-SOIC surface mount package. The MAX931CSA is classified as obsolete, making substitute parts necessary for new designs and ongoing production requirements. Active alternatives with compatible electrical and mechanical specifications are available from Analog Devices and Texas Instruments.
Substiute Parts
Key Parameters
| Parameter | MAX931CSA |
|---|---|
| Manufacturer | Analog Devices Inc./Maxim Integrated |
| Product Status | Obsolete |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) |
| Mounting Type | Surface Mount |
| Output Type | CMOS, TTL |
| Voltage - Supply, Single/Dual (±) | 2.5V ~ 11V, ±1.25V ~ 5.5V |
| Voltage - Input Offset (Max) | 10mV @ 5V |
| Current - Output (Typ) | 0.015mA @ 5V |
| Current - Quiescent (Max) | 4µA |
| CMRR, PSRR (Typ) | 80dB CMRR, 80dB PSRR |
| Propagation Delay (Max) | 12µs |
| Hysteresis | 50mV |
| Operating Temperature | 0°C ~ 70°C |
| RoHS Status | RoHS non-compliant |
Substitute Part Grouping Explanation
Substitution for the MAX931CSA is determined by the following critical parameters:
Mechanical Compatibility: All substitute parts must use the 8-SOIC (0.154", 3.90mm Width) surface mount package to ensure PCB layout compatibility without redesign.
Electrical Compatibility: Substitute parts must support the same output type (CMOS, TTL), operate within overlapping supply voltage ranges, and maintain comparable propagation delay and hysteresis characteristics for functional equivalence in comparator applications.
Functional Equivalence: All candidates must be single-element comparators with integrated voltage reference, matching the core functionality of the MAX931CSA.
Substitute parts are grouped into two categories:
Direct Manufacturer Equivalents: Parts from Analog Devices Inc./Maxim Integrated that share identical electrical specifications and packaging, differing only in product status and compliance certifications.
Cross-Manufacturer Alternatives: Parts from Texas Instruments and Analog Devices that meet electrical and mechanical requirements but may exhibit variations in specific parameters such as input offset voltage, quiescent current, or operating temperature range.
Parameter Comparison
| Part Number | Manufacturer | Product Status | Package | Output Type | Supply Voltage | Input Offset (Max) | Quiescent Current (Max) | Propagation Delay (Max) | Hysteresis | Operating Temp | RoHS Status |
|---|---|---|---|---|---|---|---|---|---|---|---|
| MAX931CSA | Analog Devices/Maxim | Obsolete | 8-SOIC | CMOS, TTL | 2.5V ~ 11V, ±1.25V ~ 5.5V | 10mV @ 5V | 4µA | 12µs | 50mV | 0°C ~ 70°C | Non-compliant |
| MAX931CSA+ | Analog Devices/Maxim | Active | 8-SOIC | CMOS, TTL | 2.5V ~ 11V, ±1.25V ~ 5.5V | 10mV @ 5V | 4µA | 12µs | 50mV | 0°C ~ 70°C | ROHS3 Compliant |
| LMP7300MA/NOPB | Texas Instruments | Active | 8-SOIC | CMOS, Open-Collector, TTL | 2.7V ~ 12V, ±1.35V ~ 6V | 0.75mV @ 5V | 13µA | 15µs | 1mV | -40°C ~ 125°C | ROHS3 Compliant |
| LTC1440CS8#PBF | Analog Devices | Active | 8-SOIC | CMOS, TTL | 2V ~ 11V, ±1V ~ 5.5V | 10mV @ 5V | 4.4µA | 15µs | 50mV | 0°C ~ 70°C | ROHS3 Compliant |
| LTC1440CS8#TRPBF | Analog Devices | Active | 8-SOIC | CMOS, TTL | 2V ~ 11V, ±1V ~ 5.5V | 10mV @ 5V | 4.4µA | 15µs | 50mV | 0°C ~ 70°C | ROHS3 Compliant |
| LTC1440IS8#PBF | Analog Devices | Active | 8-SOIC | CMOS, TTL | 2V ~ 11V, ±1V ~ 5.5V | 10mV @ 5V | 4.4µA | 15µs | 50mV | -40°C ~ 85°C | ROHS3 Compliant |
| LTC1440IS8#TRPBF | Analog Devices | Active | 8-SOIC | CMOS, TTL | 2V ~ 11V, ±1V ~ 5.5V | 10mV @ 5V | 4.4µA | 15µs | 50mV | -40°C ~ 85°C | ROHS3 Compliant |
| LTC1540CS8#PBF | Analog Devices | Active | 8-SOIC | CMOS, TTL | 2V ~ 11V, ±1V ~ 5.5V | 12mV @ 5V | 680nA | 60µs | 50mV | 0°C ~ 70°C | ROHS3 Compliant |
| LTC1540CS8#TRPBF | Analog Devices | Active | 8-SOIC | CMOS, TTL | 2V ~ 11V, ±1V ~ 5.5V | 12mV @ 5V | 680nA | 60µs | 50mV | 0°C ~ 70°C | ROHS3 Compliant |
| LTC1540IS8#PBF | Analog Devices | Active | 8-SOIC | CMOS, TTL | 2V ~ 11V, ±1V ~ 5.5V | 12mV @ 5V | 710nA | 60µs | 50mV | -40°C ~ 85°C | ROHS3 Compliant |
| LTC1540IS8#TRPBF | Analog Devices | Active | 8-SOIC | CMOS, TTL | 2V ~ 11V, ±1V ~ 5.5V | 12mV @ 5V | 710nA | 60µs | 50mV | -40°C ~ 85°C | ROHS3 Compliant |
Engineering Selection Recommendations
Primary Recommendation: MAX931CSA+
The MAX931CSA+ is the direct active equivalent of the MAX931CSA. It maintains identical electrical specifications, package configuration, and functional characteristics while offering ROHS3 compliance. This part is the preferred substitute for direct replacement in existing designs without circuit modification.
Secondary Recommendation: LTC1440 Series (CS8#PBF, CS8#TRPBF, IS8#PBF, IS8#TRPBF)
The LTC1440 series provides functional equivalence with identical output type, hysteresis, and input offset voltage specifications. These parts operate within a slightly lower supply voltage range (2V minimum versus 2.5V) and exhibit marginally higher propagation delay (15µs versus 12µs). All variants are ROHS3 compliant and available in both tube and tape & reel packaging. The IS8 temperature-rated variants extend operating range to -40°C ~ 85°C, suitable for industrial applications.
Tertiary Recommendation: LTC1540 Series (CS8#PBF, CS8#TRPBF, IS8#PBF, IS8#TRPBF)
The LTC1540 series offers ultra-low quiescent current (680nA to 710nA) compared to the MAX931CSA (4µA), making it suitable for battery-powered or low-power applications. Trade-offs include extended propagation delay (60µs versus 12µs) and marginally higher input offset voltage (12mV versus 10mV). All variants are ROHS3 compliant. The IS8 temperature-rated variants support -40°C ~ 85°C operation.
Cross-Manufacturer Alternative: LMP7300MA/NOPB
The LMP7300MA/NOPB from Texas Instruments provides superior input offset voltage (0.75mV versus 10mV) and extended operating temperature range (-40°C ~ 125°C). Output type includes open-collector in addition to CMOS and TTL. Supply voltage range is slightly higher (2.7V minimum, 12V maximum). Quiescent current is elevated (13µA versus 4µA), and hysteresis is significantly reduced (1mV versus 50mV). This part is suitable for precision applications requiring lower offset voltage and wider temperature operation.
Compliance Consideration: All substitute parts except MAX931CSA+ are ROHS3 compliant, addressing regulatory requirements for new designs. The MAX931CSA is RoHS non-compliant and should be phased out in favor of compliant alternatives.
Frequently Asked Questions (FAQ)
Q: Can MAX931CSA+ be used as a direct drop-in replacement for MAX931CSA?
A: Yes. The MAX931CSA+ is electrically and mechanically identical to the MAX931CSA, differing only in product status (active versus obsolete) and RoHS compliance. No circuit modifications are required.
Q: What is the primary difference between LTC1440 and LTC1540 series?
A: The LTC1540 series features significantly lower quiescent current (680nA to 710nA versus 4.4µA), making it suitable for ultra-low-power applications. The LTC1440 series maintains faster propagation delay (15µs versus 60µs). Both series share identical output type, hysteresis, and input offset voltage specifications.
Q: Does packaging type (tube versus tape & reel) affect electrical performance?
A: No. Tube and tape & reel packaging variants of the same part number (e.g., LTC1440CS8#PBF versus LTC1440CS8#TRPBF) are electrically identical. Packaging selection depends on assembly process requirements and volume considerations.
Q: Why does LMP7300MA/NOPB have lower hysteresis (1mV) compared to other substitutes (50mV)?
A: Hysteresis is a design characteristic determined by the internal comparator architecture. The LMP7300MA/NOPB is optimized for precision threshold detection with minimal hysteresis, while MAX931CSA and LTC series are designed with 50mV hysteresis for noise immunity in general-purpose applications. Selection depends on application requirements.
Q: Are temperature-rated variants (IS8) compatible with standard-rated variants (CS8)?
A: Temperature-rated variants (IS8: -40°C ~ 85°C) extend the operating range compared to standard variants (CS8: 0°C ~ 70°C). Both are electrically equivalent within their respective temperature ranges. Selection depends on application environment requirements.
Q: What is the significance of RoHS compliance for substitute selection?
A: ROHS3 compliance is mandatory for new designs and products sold in regulated markets. All substitute parts except the original MAX931CSA are ROHS3 compliant. The MAX931CSA+ provides the most direct path to compliance while maintaining identical specifications.
Q: Can LMP7300MA/NOPB replace MAX931CSA in all applications?
A: LMP7300MA/NOPB is functionally compatible but exhibits different electrical characteristics: lower input offset voltage (0.75mV versus 10mV), higher quiescent current (13µA versus 4µA), and significantly lower hysteresis (1mV versus 50mV). Applications sensitive to hysteresis or quiescent current may require circuit evaluation before substitution.
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