MAX971CSA Equivalent & Substitute Parts

Part Overview

The MAX971CSA 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-SOIC surface mount package. The MAX971CSA is classified as obsolete, which necessitates identification of functionally equivalent active alternatives for new designs and ongoing production requirements. Substitute parts must maintain electrical compatibility across supply voltage ranges, input offset specifications, hysteresis characteristics, and package form factors while meeting current RoHS and REACH compliance standards.

Key Parameters

Parameter	MAX971CSA
Manufacturer	Analog Devices Inc./Maxim Integrated
Product Status	Obsolete
Type	Comparator with Voltage Reference
Output Type	Open-Drain
Number of Elements	1
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
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	RoHS non-compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

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

Electrical Compatibility Requirements:

Comparator with integrated voltage reference topology
Single element configuration
Supply voltage range encompassing 2.5V ~ 11V and ±1.25V ~ 5.5V
Input offset specification of 10mV @ 5V or better
Hysteresis of 50mV
CMRR and PSRR of 80dB or greater
Quiescent current within acceptable operational limits

Package and Mechanical Requirements:

8-pin SOIC surface mount package (0.154", 3.90mm width)
Pin-compatible footprint

Compliance Requirements:

Active product status preferred for new designs
RoHS3 compliance required for modern applications

Substitute parts are grouped into two categories: direct pin-compatible replacements maintaining open-drain output (MAX971CSA+) and functionally equivalent alternatives with CMOS/TTL output topology (LTC1440 and LTC1540 series) that provide enhanced performance characteristics while maintaining core electrical specifications.

Parameter Comparison

Parameter	MAX971CSA	MAX971CSA+	LTC1440CS8#PBF	LTC1440IS8#PBF	LTC1540CS8#PBF	LTC1540IS8#PBF	MIC833YM5-TR
Manufacturer	Analog Devices	Analog Devices	Analog Devices	Analog Devices	Analog Devices	Analog Devices	Microchip Technology
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
Type	with Voltage Reference	with Voltage Reference	with Voltage Reference	with Voltage Reference	with Voltage Reference	with Voltage Reference	with Voltage Reference
Output Type	Open-Drain	Open-Drain	CMOS, TTL	CMOS, TTL	CMOS, TTL	CMOS, TTL	Open-Drain
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	1.5V ~ 5.5V
Voltage - Input Offset (Max)	10mV @ 5V	10mV @ 5V	10mV @ 5V	10mV @ 5V	12mV @ 5V	12mV @ 5V	Not specified
Current - Quiescent (Max)	4µA	4µA	4.4µA	4.4µA	680nA	710nA	Not specified
CMRR / PSRR (Typ)	80dB / 80dB	80dB / 80dB	80dB / 80dB	80dB / 80dB	80dB / 80dB	80dB / 80dB	Not specified
Hysteresis	50mV	50mV	50mV	50mV	50mV	50mV	Not specified
Propagation Delay (Max)	Not specified	Not specified	15µs	15µs	60µs	60µs	5µs
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C	-40°C ~ 85°C	0°C ~ 70°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	SOT-23-5
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Direct Pin-Compatible Replacement (Preferred for Existing Designs):

MAX971CSA+ is the direct successor to MAX971CSA, maintaining identical electrical specifications, open-drain output topology, and 8-SOIC package footprint. This part transitions from obsolete to active product status while achieving ROHS3 compliance. Selection of MAX971CSA+ eliminates design modification requirements and preserves circuit functionality without layout changes.

Enhanced Performance Alternatives (LTC1440 Series):

LTC1440CS8#PBF and LTC1440IS8#PBF provide CMOS/TTL output configuration with improved propagation delay (15µs versus unspecified for MAX971CSA). These parts maintain 80dB CMRR/PSRR, 50mV hysteresis, and 10mV input offset specifications. LTC1440IS8#PBF extends operating temperature to -40°C ~ 85°C, supporting wider environmental applications. Output stage modification requires circuit-level evaluation for pull-up resistor configuration.

Ultra-Low Quiescent Current Alternative (LTC1540 Series):

LTC1540CS8#PBF and LTC1540IS8#PBF reduce quiescent current to 680nA/710nA (versus 4µA for MAX971CSA), enabling battery-powered and low-power applications. Input offset increases to 12mV maximum, and propagation delay extends to 60µs. LTC1540IS8#PBF provides -40°C ~ 85°C operating range. CMOS/TTL output requires circuit adaptation.

Compact Package Alternative (MIC833YM5-TR):

MIC833YM5-TR from Microchip Technology offers SOT-23-5 package in 4541 units inventory. This part maintains open-drain output and -40°C ~ 85°C operating temperature. Supply voltage range narrows to 1.5V ~ 5.5V, and propagation delay improves to 5µs. Package footprint differs significantly, requiring PCB redesign. Input offset and hysteresis specifications are not provided in available documentation.

Frequently Asked Questions (FAQ)

Q: Can MAX971CSA+ be used as a direct replacement for MAX971CSA?

A: Yes. MAX971CSA+ maintains identical electrical specifications, output topology (open-drain), and 8-SOIC package configuration. The primary difference is product status transition from obsolete to active and achievement of ROHS3 compliance. No circuit modifications are required.

Q: What is the key difference between MAX971CSA and LTC1440 series?

A: Output topology differs. MAX971CSA features open-drain output, while LTC1440 series provides CMOS/TTL output. This requires circuit-level evaluation of pull-up resistor requirements and output voltage swing characteristics. LTC1440 series also provides faster propagation delay (15µs versus unspecified).

Q: When should LTC1540 series be selected over LTC1440 series?

A: LTC1540 series is selected for applications requiring ultra-low quiescent current (680nA/710nA versus 4.4µA). This advantage is offset by increased propagation delay (60µs versus 15µs) and slightly higher input offset (12mV versus 10mV). Battery-powered and standby-mode applications benefit from LTC1540 selection.

Q: Is MIC833YM5-TR compatible with existing MAX971CSA PCB layouts?

A: No. MIC833YM5-TR uses SOT-23-5 package versus 8-SOIC for MAX971CSA. PCB redesign is required. Additionally, supply voltage range is narrower (1.5V ~ 5.5V), requiring verification against circuit operating conditions.

Q: What packaging options are available for substitute parts?

A: LTC1440 and LTC1540 series are available in tube (CS8#PBF) and tape & reel (CS8#TRPBF, IS8#TRPBF) packaging. MAX971CSA+ is supplied in tube packaging. MIC833YM5-TR is supplied in cut tape and digi-reel format. Selection depends on production volume and assembly requirements.

Q: Do all substitute parts meet RoHS3 compliance?

A: All active substitute parts (MAX971CSA+, LTC1440 series, LTC1540 series, MIC833YM5-TR) are ROHS3 compliant. The original MAX971CSA is RoHS non-compliant. Modern applications and regulated industries require RoHS3-compliant component selection.

Q: What is the inventory status for substitute parts?

A: MAX971CSA+ has 2000 units in stock. LTC1440CS8#PBF has 1625 units. LTC1440CS8#TRPBF has 8250 units. LTC1540CS8#PBF has 2300 units. LTC1540CS8#TRPBF has 3700 units. LTC1540IS8#PBF has 2100 units. LTC1540IS8#TRPBF has 2800 units. MIC833YM5-TR has 4541 units. Availability supports both prototype and production-volume requirements.

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