MAX971CSA+ Equivalent & Substitute Parts

Part Overview

The MAX971CSA+ is a linear comparator integrated circuit with integrated voltage reference, manufactured by Analog Devices Inc./Maxim Integrated. This 8-SOIC surface mount device operates across single supply voltages of 2.5V to 11V or dual supplies of ±1.25V to 5.5V, featuring open-drain output configuration. The device is classified as Active product status with full RoHS3 compliance and unlimited moisture sensitivity rating. Substitute parts are identified when equivalent electrical performance, package compatibility, and operational parameters align with application requirements.

Key Parameters

Parameter	MAX971CSA+
Manufacturer	Analog Devices Inc./Maxim Integrated
Category	Linear Comparator with Voltage Reference
Package / Case	8-SOIC (0.154", 3.90mm Width)
Output Type	Open-Drain
Voltage Supply Range (Single/Dual)	2.5V ~ 11V / ±1.25V ~ 5.5V
Input Offset Voltage (Max)	10mV @ 5V
Quiescent Current (Max)	4µA
CMRR / PSRR (Typ)	80dB / 80dB
Hysteresis	50mV
Operating Temperature	0°C ~ 70°C
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitution eligibility for the MAX971CSA+ is determined by the following critical parameters:

Primary Substitution Criteria:

Package compatibility: 8-SOIC form factor with 0.154" width (3.90mm)
Output configuration: Open-drain or CMOS/TTL output types
Supply voltage range: Minimum overlap with 2.5V ~ 11V single supply or ±1.25V ~ 5.5V dual supply
Input offset voltage: Maximum 12mV @ 5V
Hysteresis: 50mV characteristic
CMRR/PSRR: Minimum 80dB performance
Operating temperature: Minimum coverage of 0°C ~ 70°C
Mounting: Surface mount technology
Compliance: RoHS3 and REACH requirements

Substitute Categories:

Category A - Direct Equivalents (Same Output Type): MAX971CSA+ (direct match) maintains identical electrical and mechanical specifications.

Category B - Functional Equivalents (Output Type Variation): LTC1440 series and LTC1540 series devices provide CMOS/TTL output alternatives with compatible supply ranges, offset voltage, hysteresis, and package form factors. These parts substitute when output drive capability requirements differ from open-drain configuration.

Category C - Compact Alternative (Different Package): MIC833YM5-TR provides SOT-23-5 package option with open-drain output, suitable for space-constrained applications where 8-SOIC footprint cannot be accommodated.

Parameter Comparison

Part Number	Manufacturer	Output Type	Supply Voltage	Input Offset (Max)	Quiescent Current (Max)	Hysteresis	Operating Temp	Package	Packaging Option
MAX971CSA+	Analog Devices/Maxim	Open-Drain	2.5V~11V / ±1.25V~5.5V	10mV @ 5V	4µA	50mV	0°C ~ 70°C	8-SOIC	Tube
LTC1440CS8#PBF	Analog Devices	CMOS, TTL	2V~11V / ±1V~5.5V	10mV @ 5V	4.4µA	50mV	0°C ~ 70°C	8-SOIC	Tube
LTC1440CS8#TRPBF	Analog Devices	CMOS, TTL	2V~11V / ±1V~5.5V	10mV @ 5V	4.4µA	50mV	0°C ~ 70°C	8-SOIC	Tape & Reel
LTC1440IS8#PBF	Analog Devices	CMOS, TTL	2V~11V / ±1V~5.5V	10mV @ 5V	4.4µA	50mV	-40°C ~ 85°C	8-SOIC	Tube
LTC1440IS8#TRPBF	Analog Devices	CMOS, TTL	2V~11V / ±1V~5.5V	10mV @ 5V	4.4µA	50mV	-40°C ~ 85°C	8-SOIC	Tape & Reel
LTC1540CS8#PBF	Analog Devices	CMOS, TTL	2V~11V / ±1V~5.5V	12mV @ 5V	680nA	50mV	0°C ~ 70°C	8-SOIC	Tube
LTC1540CS8#TRPBF	Analog Devices	CMOS, TTL	2V~11V / ±1V~5.5V	12mV @ 5V	680nA	50mV	0°C ~ 70°C	8-SOIC	Tape & Reel
LTC1540IS8#PBF	Analog Devices	CMOS, TTL	2V~11V / ±1V~5.5V	12mV @ 5V	710nA	50mV	-40°C ~ 85°C	8-SOIC	Tube
LTC1540IS8#TRPBF	Analog Devices	CMOS, TTL	2V~11V / ±1V~5.5V	12mV @ 5V	710nA	50mV	-40°C ~ 85°C	8-SOIC	Tape & Reel
MIC833YM5-TR	Microchip Technology	Open-Drain	1.5V~5.5V	Not specified	Not specified	Not specified	-40°C ~ 85°C	SOT-23-5	Tape & Reel

Engineering Selection Recommendations

For 8-SOIC Package Retention with Open-Drain Output: MAX971CSA+ remains the primary selection when open-drain output topology is required. The device maintains Active product status with full RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1).

For 8-SOIC Package with CMOS/TTL Output: LTC1440 series (base product number LTC1440) provides direct 8-SOIC package substitution with CMOS/TTL output capability. The LTC1440CS8#PBF and LTC1440CS8#TRPBF variants maintain 0°C to 70°C operating range matching the MAX971CSA+ specification. Extended temperature variants (LTC1440IS8#PBF and LTC1440IS8#TRPBF) expand operating range to -40°C to 85°C. All LTC1440 variants are Active status with RoHS3 compliance.

For Ultra-Low Quiescent Current in 8-SOIC Package: LTC1540 series (base product number LTC1540) offers reduced quiescent current (680nA typical for C-grade, 710nA for I-grade) compared to MAX971CSA+ (4µA) and LTC1440 series (4.4µA). LTC1540CS8#PBF and LTC1540CS8#TRPBF maintain 0°C to 70°C range, while LTC1540IS8#PBF and LTC1540IS8#TRPBF extend to -40°C to 85°C. All variants feature CMOS/TTL output and are Active status with RoHS3 compliance.

For Space-Constrained Applications: MIC833YM5-TR provides SOT-23-5 package alternative with open-drain output, suitable when 8-SOIC footprint cannot be accommodated. This Microchip Technology device operates across 1.5V to 5.5V supply range and -40°C to 85°C temperature range. MIC833YM5-TR is Active status with RoHS3 compliance.

Packaging Considerations: Tube packaging (#PBF suffix) is appropriate for lower-volume applications and manual assembly. Tape & Reel packaging (#TRPBF suffix) is specified for high-volume production and automated pick-and-place assembly.

Frequently Asked Questions (FAQ)

Q: Can LTC1440 series parts directly replace MAX971CSA+ in existing designs? A: LTC1440 series maintains identical 8-SOIC package, supply voltage range, input offset voltage, hysteresis, and CMRR/PSRR specifications. The primary difference is output type: LTC1440 provides CMOS/TTL output versus MAX971CSA+ open-drain output. Direct substitution is possible only if the circuit design accommodates CMOS/TTL output drive characteristics. Verify pull-up resistor requirements and output current specifications in your application.

Q: What is the advantage of LTC1540 series over LTC1440 series? A: LTC1540 series reduces quiescent current to 680nA (C-grade) or 710nA (I-grade) compared to LTC1440 series at 4.4µA. This reduction is beneficial for battery-powered or ultra-low-power applications. Both series maintain identical package, supply voltage, offset voltage, and hysteresis specifications. LTC1540 series exhibits longer propagation delay (60µs versus 15µs for LTC1440), which may impact high-speed switching applications.

Q: Is MIC833YM5-TR suitable as a direct replacement for MAX971CSA+? A: MIC833YM5-TR shares open-drain output configuration with MAX971CSA+, but operates in SOT-23-5 package versus 8-SOIC. This package change requires PCB layout modification and is suitable only for new designs or redesigns where space constraints justify the footprint change. MIC833YM5-TR supply voltage range (1.5V to 5.5V) is narrower than MAX971CSA+ (2.5V to 11V single supply), limiting applicability to lower-voltage systems.

Q: What packaging options are available for each substitute part? A: All LTC1440 and LTC1540 variants are available in Tube (standard #PBF suffix) or Tape & Reel (production #TRPBF suffix) packaging. MAX971CSA+ is supplied in Tube packaging. MIC833YM5-TR is supplied in Tape & Reel packaging. Select Tube packaging for prototyping and low-volume applications; select Tape & Reel for production quantities and automated assembly.

Q: Do all substitute parts meet RoHS3 and REACH compliance? A: All substitute parts listed (LTC1440 series, LTC1540 series, and MIC833YM5-TR) are RoHS3 compliant and REACH unaffected, matching MAX971CSA+ compliance status. All devices carry MSL 1 (unlimited) moisture sensitivity rating.

Q: What is the temperature range difference between C-grade and I-grade variants? A: C-grade variants (LTC1440CS8, LTC1540CS8) operate across 0°C to 70°C. I-grade variants (LTC1440IS8, LTC1540IS8) extend operating range to -40°C to 85°C. Select I-grade for industrial, automotive, or extended-temperature applications; select C-grade for commercial temperature range requirements.

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