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MAX971CUA-T Equivalent & Substitute Parts
Part Overview
The MAX971CUA-T is a linear comparator with integrated voltage reference manufactured by Analog Devices Inc./Maxim Integrated. This device features open-drain output configuration in an 8-uMAX/uSOP package and operates across supply voltages of 2.5V to 11V (single supply) or ±1.25V to ±5.5V (dual supply). The MAX971CUA-T is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. Substitute parts must maintain compatibility across electrical specifications, package dimensions, and mounting characteristics while meeting current product availability and compliance standards.
Substiute Parts
Key Parameters
| Parameter | MAX971CUA-T |
|---|---|
| Manufacturer | Analog Devices Inc./Maxim Integrated |
| Product Status | Obsolete |
| Type | Comparator with Voltage Reference |
| Output Type | Open-Drain |
| Package / Case | 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) |
| Supplier Device Package | 8-uMAX/uSOP |
| Voltage - Supply, Single/Dual (±) | 2.5V ~ 11V, ±1.25V ~ 5.5V |
| Voltage - Input Offset (Max) | 10mV @ 5V |
| Current - Quiescent (Max) | 4µA |
| CMRR, PSRR (Typ) | 80dB CMRR, 80dB PSRR |
| Hysteresis | 50mV |
| Operating Temperature | 0°C ~ 70°C |
| Mounting Type | Surface Mount |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution of the MAX971CUA-T is determined by the following critical parameters:
Electrical Compatibility Requirements:
- Supply voltage range must encompass or match the original specification (2.5V ~ 11V single supply, ±1.25V ~ 5.5V dual supply)
- Input offset voltage must not exceed 10mV @ 5V
- Hysteresis must equal 50mV
- CMRR and PSRR must meet or exceed 80dB
- Quiescent current must not exceed 4µA
Package and Mechanical Compatibility:
- Package must be 8-TSSOP or 8-MSOP with 0.118" (3.00mm) width
- Surface mount configuration required
- Supplier device package must be 8-MSOP or 8-uMAX/uSOP compatible
Compliance and Availability:
- RoHS3 compliance required
- MSL rating of 1 (Unlimited) required
- Active product status preferred for long-term availability
Substitute parts are grouped into two categories: direct form-fit-function replacements (MAX971CUA+T) and functionally equivalent alternatives with modified output characteristics (LTC1440 and LTC1540 series). The LTC1440 and LTC1540 series offer CMOS/TTL output instead of open-drain, requiring circuit-level evaluation for compatibility.
Parameter Comparison
| Parameter | MAX971CUA-T | MAX971CUA+T | LTC1440CMS8#PBF | LTC1440CMS8#TRPBF | LTC1440IMS8#PBF | LTC1440IMS8#TRPBF | LTC1540CMS8#PBF | LTC1540CMS8#TRPBF | LTC1540IMS8#PBF |
|---|---|---|---|---|---|---|---|---|---|
| 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. |
| Product Status | Obsolete | Active | Active | Active | Active | Active | Active | Active | Active |
| Output Type | Open-Drain | Open-Drain | CMOS, TTL | CMOS, TTL | CMOS, TTL | CMOS, TTL | CMOS, TTL | CMOS, TTL | CMOS, TTL |
| Voltage - Supply, Single/Dual (±) | 2.5V ~ 11V, ±1.25V ~ 5.5V | 2.5V ~ 11V, ±1.25V ~ 5.5V | 2V ~ 11V, ±1V ~ 5.5V | 2V ~ 11V, ±1V ~ 5.5V | 2V ~ 11V, ±1V ~ 5.5V | 2V ~ 11V, ±1V ~ 5.5V | 2V ~ 11V, ±1V ~ 5.5V | 2V ~ 11V, ±1V ~ 5.5V | 2V ~ 11V, ±1V ~ 5.5V |
| Voltage - Input Offset (Max) | 10mV @ 5V | 10mV @ 5V | 10mV @ 5V | 10mV @ 5V | 10mV @ 5V | 10mV @ 5V | 12mV @ 5V | 12mV @ 5V | 12mV @ 5V |
| Current - Quiescent (Max) | 4µA | 4µA | 4.4µA | 4.4µA | 4µA | 4.4µA | 680nA | 680nA | 710nA |
| CMRR, PSRR (Typ) | 80dB CMRR, 80dB PSRR | 80dB CMRR, 80dB PSRR | 80dB CMRR, 80dB PSRR | 80dB CMRR, 80dB PSRR | 40dB CMRR, 40dB PSRR | 80dB CMRR, 80dB PSRR | 80dB CMRR, 80dB PSRR | 80dB CMRR, 80dB PSRR | 80dB CMRR, 80dB PSRR |
| Hysteresis | 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 |
| Package / Case | 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) | 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) | 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) | 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) | 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) | 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) | 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) | 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) | 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
| RoHS Status | 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) |
Engineering Selection Recommendations
Primary Substitute: MAX971CUA+T
The MAX971CUA+T is the direct form-fit-function replacement for the MAX971CUA-T. This part maintains identical electrical specifications, output configuration (open-drain), and package dimensions. The MAX971CUA+T carries active product status, ensuring long-term availability and supply chain continuity. Both parts are ROHS3 compliant with MSL rating of 1 (Unlimited). Selection of MAX971CUA+T eliminates circuit redesign requirements and provides pin-for-pin compatibility.
Secondary Substitutes: LTC1440 and LTC1540 Series
The LTC1440CMS8#PBF, LTC1440CMS8#TRPBF, LTC1440IMS8#PBF, LTC1440IMS8#TRPBF, LTC1540CMS8#PBF, LTC1540CMS8#TRPBF, and LTC1540IMS8#PBF are functionally equivalent alternatives. These parts share identical package dimensions, hysteresis (50mV), and CMRR/PSRR specifications. Critical differences include output type (CMOS/TTL instead of open-drain) and quiescent current characteristics. The LTC1540 series offers significantly lower quiescent current (680nA to 710nA) compared to the original specification (4µA), making it suitable for ultra-low-power applications. All substitute parts maintain ROHS3 compliance and MSL rating of 1 (Unlimited). Selection of LTC1440 or LTC1540 series requires circuit-level evaluation to accommodate the output stage modification.
Frequently Asked Questions (FAQ)
Q: Can MAX971CUA+T be used as a direct replacement for MAX971CUA-T?
A: Yes. The MAX971CUA+T is a direct form-fit-function replacement. Electrical specifications, output configuration, and package dimensions are identical. The primary difference is product status: MAX971CUA+T is active while MAX971CUA-T is obsolete. No circuit modifications are required.
Q: What is the key difference between MAX971CUA-T and LTC1440/LTC1540 series?
A: The primary difference is output type. MAX971CUA-T features open-drain output, while LTC1440 and LTC1540 series provide CMOS/TTL output. This requires circuit-level evaluation, particularly in pull-up resistor configuration and output drive capability. Electrical specifications including supply voltage range, input offset voltage, hysteresis, and CMRR/PSRR are compatible.
Q: Which substitute part offers the lowest power consumption?
A: The LTC1540 series (LTC1540CMS8#PBF, LTC1540CMS8#TRPBF, LTC1540IMS8#PBF) offers the lowest quiescent current at 680nA to 710nA, compared to 4µA for the original MAX971CUA-T and 4.4µA for the LTC1440 series. Selection depends on application power budget requirements.
Q: Are all substitute parts available in the same package?
A: Yes. All substitute parts use 8-TSSOP or 8-MSOP package with 0.118" (3.00mm) width, maintaining identical PCB footprint and mounting characteristics. Packaging options vary (Tube, Tape & Reel) but do not affect electrical or mechanical compatibility.
Q: What is the operating temperature range difference between substitutes?
A: MAX971CUA-T and LTC1540CMS8 series operate across 0°C to 70°C. LTC1440IMS8 and LTC1540IMS8 series extend the range to -40°C to 85°C, providing wider temperature coverage for industrial and automotive applications. Selection depends on end-use environment requirements.
Q: Do all substitute parts meet RoHS3 compliance?
A: Yes. All substitute parts listed are ROHS3 compliant with MSL rating of 1 (Unlimited), matching the original MAX971CUA-T specification. Compliance certifications are identical across all alternatives.
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