MAX971ESA-T Equivalent & Substitute Parts

Part Overview

The MAX971ESA-T is a linear comparator integrated circuit with integrated voltage reference, manufactured by Analog Devices Inc./Maxim Integrated. This device features open-drain output configuration in an 8-SOIC surface mount package. The part is currently obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The MAX971ESA-T operates across a wide supply voltage range (2.5V to 11V single supply, ±1.25V to ±5.5V dual supply) with integrated voltage reference functionality suitable for precision comparison applications.

Key Parameters

Parameter	Value	Unit
Output Type	Open-Drain	—
Number of Elements	1	—
Voltage Supply (Single)	2.5V to 11V	V
Voltage Supply (Dual)	±1.25V to ±5.5V	V
Input Offset Voltage (Max)	10mV @ 5V	mV
Quiescent Current (Max)	4µA	µA
CMRR / PSRR (Typ)	80dB / 80dB	dB
Hysteresis	50mV	mV
Operating Temperature	-40°C to 85°C	°C
Package	8-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
MSL Rating	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution for the MAX971ESA-T is determined by the following critical parameters:

Primary Substitution Criteria:

Comparator with integrated voltage reference functionality
Single element configuration
8-pin surface mount package (8-SOIC or equivalent 8-SO)
Supply voltage compatibility: minimum 2.5V single supply or ±1.25V dual supply capability
Input offset voltage specification of 10mV to 12mV @ 5V
Hysteresis of 50mV
Operating temperature range including -40°C to 85°C
RoHS3 compliance and MSL 1 rating

Substitute Categories:

Category 1: Direct Packaging Equivalents (8-SOIC) MAX971ESA+T represents the active production equivalent with identical electrical specifications and packaging, differentiated only by packaging format (Tape & Reel vs. individual tube).

Category 2: Functional Equivalents with Output Type Variation (CMOS/TTL Output) LTC1440 series (LTC1440CS8#PBF, LTC1440CS8#TRPBF, LTC1440IS8#PBF, LTC1440IS8#TRPBF) and LTC1540 series (LTC1540CS8#PBF, LTC1540CS8#TRPBF, LTC1540IS8#PBF, LTC1540IS8#TRPBF) maintain core electrical specifications but feature CMOS/TTL output instead of open-drain. These parts support the same supply voltage ranges, hysteresis, and temperature operating windows. The LTC1540 series exhibits lower quiescent current (680nA to 710nA vs. 4µA) and extended propagation delay (60µs vs. unspecified for MAX971ESA-T).

Category 3: Alternative Package Format (SOT-23-5) MIC833YM5-TR from Microchip Technology provides comparator with voltage reference in a smaller SOT-23-5 package. This part maintains open-drain output and -40°C to 85°C operating range but operates across a narrower supply voltage range (1.5V to 5.5V) and features faster propagation delay (5µs).

Parameter Comparison

Parameter	MAX971ESA-T	MAX971ESA+T	LTC1440CS8#PBF	LTC1440IS8#TRPBF	LTC1540CS8#PBF	LTC1540IS8#TRPBF	MIC833YM5-TR
Manufacturer	Analog Devices	Analog Devices	Analog Devices	Analog Devices	Analog Devices	Analog Devices	Microchip
Output Type	Open-Drain	Open-Drain	CMOS, TTL	CMOS, TTL	CMOS, TTL	CMOS, TTL	Open-Drain
Supply Voltage (Single)	2.5V–11V	2.5V–11V	2V–11V	2V–11V	2V–11V	2V–11V	1.5V–5.5V
Supply Voltage (Dual)	±1.25V–±5.5V	±1.25V–±5.5V	±1V–±5.5V	±1V–±5.5V	±1V–±5.5V	±1V–±5.5V	—
Input Offset (Max)	10mV @ 5V	10mV @ 5V	10mV @ 5V	10mV @ 5V	12mV @ 5V	12mV @ 5V	—
Quiescent Current (Max)	4µA	4µA	4.4µA	4.4µA	680nA	710nA	—
CMRR / PSRR (Typ)	80dB / 80dB	80dB / 80dB	80dB / 80dB	80dB / 80dB	80dB / 80dB	80dB / 80dB	—
Hysteresis	50mV	50mV	50mV	50mV	50mV	50mV	—
Operating Temperature	-40°C–85°C	-40°C–85°C	0°C–70°C	-40°C–85°C	0°C–70°C	-40°C–85°C	-40°C–85°C
Package	8-SOIC	8-SOIC	8-SO	8-SO	8-SO	8-SO	SOT-23-5
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical and Mechanical Specifications): MAX971ESA+T is the active production equivalent. This part maintains all electrical parameters, package dimensions, and operating characteristics of the obsolete MAX971ESA-T. Selection of this part requires no circuit redesign and supports identical PCB layouts. Packaging format differs (Tape & Reel vs. tube), which affects procurement and assembly processes but not electrical performance.

For Open-Drain Output Requirement with Alternative Package: MIC833YM5-TR provides open-drain output configuration in a smaller SOT-23-5 package. This selection is appropriate when board space constraints permit package downsizing. The narrower supply voltage range (1.5V to 5.5V) requires verification against application requirements. This part is suitable for lower-voltage applications and offers faster propagation delay (5µs).

For CMOS/TTL Output with Extended Temperature Range: LTC1440IS8#TRPBF and LTC1540IS8#TRPBF both support the full -40°C to 85°C operating temperature range. LTC1440IS8#TRPBF maintains lower quiescent current (4.4µA) and faster propagation delay (15µs) compared to LTC1540IS8#TRPBF, which features ultra-low quiescent current (710nA) at the cost of extended propagation delay (60µs). Selection between these depends on power consumption and timing requirements.

For Standard Temperature Range Applications (0°C to 70°C): LTC1440CS8#PBF and LTC1540CS8#PBF are suitable for applications not requiring extended low-temperature operation. These parts are available in tube packaging and offer cost optimization for standard industrial temperature ranges.

All substitute parts maintain RoHS3 compliance and MSL 1 rating, ensuring compatibility with modern manufacturing and environmental standards.

Frequently Asked Questions (FAQ)

Q: Can MAX971ESA+T be used as a direct replacement for MAX971ESA-T? A: Yes. MAX971ESA+T is electrically and mechanically identical to MAX971ESA-T. The only difference is packaging format (Tape & Reel vs. tube). No circuit modifications are required.

Q: What is the primary difference between LTC1440 and LTC1540 series? A: Both series feature CMOS/TTL output instead of open-drain. The LTC1540 series exhibits significantly lower quiescent current (680–710nA vs. 4.4µA for LTC1440) but has extended propagation delay (60µs vs. 15µs). Selection depends on power consumption versus timing constraints.

Q: Can LTC1440 or LTC1540 series replace MAX971ESA-T in all applications? A: LTC1440 and LTC1540 series feature CMOS/TTL output instead of open-drain. Applications requiring open-drain output characteristics require circuit redesign. Verify output stage compatibility before substitution.

Q: Is MIC833YM5-TR suitable for high-voltage applications? A: No. MIC833YM5-TR operates across 1.5V to 5.5V supply range, which is narrower than MAX971ESA-T (2.5V to 11V single supply). This part is limited to lower-voltage applications.

Q: What are the temperature range differences among substitutes? A: MAX971ESA-T, MAX971ESA+T, LTC1440IS8#TRPBF, LTC1540IS8#TRPBF, and MIC833YM5-TR all support -40°C to 85°C. LTC1440CS8#PBF and LTC1540CS8#PBF are limited to 0°C to 70°C. Verify application temperature requirements before selection.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All listed substitute parts maintain ROHS3 compliance and MSL 1 rating, meeting modern environmental and manufacturing standards.

Q: What packaging options are available? A: MAX971ESA+T, LTC1440 series, and LTC1540 series are available in 8-SOIC/8-SO packages in both tube and Tape & Reel formats. MIC833YM5-TR uses SOT-23-5 package in Tape & Reel format. Package selection affects assembly processes and procurement logistics.

Q: How do input offset voltage specifications compare? A: MAX971ESA-T and LTC1440 series specify 10mV maximum input offset @ 5V. LTC1540 series specifies 12mV maximum input offset @ 5V. This 2mV difference may be significant in precision comparison applications.

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