MAX971ESA Equivalent & Substitute Parts

Part Overview

The MAX971ESA 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 MAX971ESA is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer	Analog Devices Inc./Maxim Integrated
Part Number	MAX971ESA
Product Status	Obsolete
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Output Type	Open-Drain
Voltage Supply (Single)	2.5V ~ 11V
Voltage Supply (Dual ±)	±1.25V ~ 5.5V
Input Offset Voltage (Max)	10mV @ 5V
Quiescent Current (Max)	4µA
CMRR / PSRR (Typ)	80dB CMRR, 80dB PSRR
Hysteresis	50mV
Operating Temperature	-40°C ~ 85°C
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

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

Electrical Compatibility Requirements:

Voltage supply range: 2.5V ~ 11V (single) or ±1.25V ~ 5.5V (dual)
Input offset voltage: 10mV @ 5V maximum
CMRR and PSRR: 80dB minimum
Hysteresis: 50mV
Operating temperature range: -40°C ~ 85°C

Mechanical Compatibility Requirements:

Package: 8-SOIC surface mount
Mounting type: Surface mount
Pin count and footprint: 8-pin SOIC

Regulatory Compliance:

RoHS3 compliance required
MSL rating: 1 (Unlimited)

Substitute parts are grouped into two categories:

Direct Equivalent (Same Output Type):

MAX971ESA+ maintains open-drain output configuration, identical electrical specifications, and active product status

Functional Alternatives (Different Output Type):

LTC1440 series (CMOS/TTL output) and LTC1540 series (CMOS/TTL output) provide comparable comparator functionality with voltage reference. These parts feature different output stages and quiescent current characteristics but maintain core electrical parameters within acceptable ranges for most applications.

Parameter Comparison

Parameter	MAX971ESA	MAX971ESA+	LTC1440CS8#PBF	LTC1440IS8#PBF	LTC1540CS8#PBF	LTC1540IS8#PBF
Product Status	Obsolete	Active	Active	Active	Active	Active
Output Type	Open-Drain	Open-Drain	CMOS, TTL	CMOS, TTL	CMOS, TTL	CMOS, TTL
Voltage Supply (Single)	2.5V ~ 11V	2.5V ~ 11V	2V ~ 11V	2V ~ 11V	2V ~ 11V	2V ~ 11V
Voltage Supply (Dual ±)	±1.25V ~ 5.5V	±1.25V ~ 5.5V	±1V ~ 5.5V	±1V ~ 5.5V	±1V ~ 5.5V	±1V ~ 5.5V
Input Offset Voltage (Max)	10mV @ 5V	10mV @ 5V	10mV @ 5V	10mV @ 5V	12mV @ 5V	12mV @ 5V
Output Current (Typ)	—	—	40mA	40mA	—	—
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
Propagation Delay (Max)	—	—	15µs	15µs	60µs	60µs
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
Package	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: MAX971ESA+

The MAX971ESA+ is the direct equivalent replacement for the obsolete MAX971ESA. This part maintains identical electrical specifications, open-drain output configuration, and operating temperature range (-40°C ~ 85°C). The MAX971ESA+ carries active product status and ROHS3 compliance, ensuring long-term availability and regulatory compliance. This part is suitable for direct substitution without circuit modification.

Secondary Recommendation: LTC1440IS8#PBF or LTC1440IS8#TRPBF

The LTC1440IS8 series provides functional equivalence with extended operating temperature range (-40°C ~ 85°C) matching the MAX971ESA. The primary difference is output type: CMOS/TTL output instead of open-drain. This substitution requires circuit evaluation to confirm output stage compatibility. The LTC1440IS8 offers faster propagation delay (15µs) compared to the MAX971ESA. Active product status and ROHS3 compliance are confirmed.

Tertiary Recommendation: LTC1540IS8#PBF or LTC1540IS8#TRPBF

The LTC1540IS8 series provides functional equivalence with extended operating temperature range (-40°C ~ 85°C). This part features significantly lower quiescent current (710nA maximum) compared to the MAX971ESA (4µA), making it suitable for power-sensitive applications. The LTC1540IS8 has slower propagation delay (60µs) and slightly higher input offset voltage (12mV @ 5V). Output type is CMOS/TTL. Active product status and ROHS3 compliance are confirmed.

Packaging Considerations:

Tube packaging (CS8#PBF, IS8#PBF): Standard for lower-volume procurement
Tape & Reel packaging (CS8#TRPBF, IS8#TRPBF): Standard for high-volume automated assembly

Frequently Asked Questions (FAQ)

Q: Can MAX971ESA+ be used as a direct drop-in replacement for MAX971ESA?

A: Yes. The MAX971ESA+ maintains identical electrical specifications, output type (open-drain), supply voltage range, input offset voltage, CMRR/PSRR, hysteresis, and operating temperature range. No circuit modifications are required.

Q: What is the key difference between MAX971ESA and LTC1440 series?

A: The primary difference is output type. MAX971ESA features open-drain output, while LTC1440 series features CMOS/TTL output. LTC1440 also offers faster propagation delay (15µs vs. unspecified for MAX971ESA). Circuit evaluation is required to confirm output stage compatibility.

Q: What is the key difference between MAX971ESA and LTC1540 series?

A: The LTC1540 series features significantly lower quiescent current (680-710nA vs. 4µA), making it suitable for power-constrained applications. LTC1540 has slower propagation delay (60µs) and slightly higher input offset voltage (12mV @ 5V). Output type is CMOS/TTL instead of open-drain.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts (MAX971ESA+, LTC1440 series, LTC1540 series) carry ROHS3 compliance certification.

Q: What operating temperature range should I select?

A: For applications requiring -40°C ~ 85°C operation, select MAX971ESA+, LTC1440IS8#PBF, LTC1440IS8#TRPBF, LTC1540IS8#PBF, or LTC1540IS8#TRPBF. For applications limited to 0°C ~ 70°C operation, LTC1440CS8#PBF, LTC1440CS8#TRPBF, LTC1540CS8#PBF, or LTC1540CS8#TRPBF are acceptable.

Q: What is the difference between tube and tape & reel packaging?

A: Tube packaging is standard for lower-volume orders and manual assembly. Tape & Reel packaging is standard for high-volume automated pick-and-place assembly. Electrical specifications are identical; packaging selection depends on assembly process requirements.

Q: Can I use LTC1440 or LTC1540 if my circuit requires open-drain output?

A: No. LTC1440 and LTC1540 series feature CMOS/TTL output stages. If open-drain output is required, use MAX971ESA+ only. Using CMOS/TTL output in an open-drain circuit will result in functional failure.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message