MAX931CPA Equivalent & Substitute Parts

Part Overview

The MAX931CPA is a comparator with integrated voltage reference, manufactured by Analog Devices Inc./Maxim Integrated. This linear IC operates with CMOS and TTL output types in an 8-DIP package configuration. The device is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. Substitute parts must maintain functional equivalence across critical electrical parameters including supply voltage range, input offset voltage, output characteristics, and propagation delay specifications.

Key Parameters

Parameter	MAX931CPA
Manufacturer	Analog Devices Inc./Maxim Integrated
Product Status	Obsolete
Package / Case	8-DIP (0.300", 7.62mm)
Mounting Type	Through Hole
Output Type	CMOS, TTL
Voltage - Supply, Single/Dual (±)	2.5V ~ 11V, ±1.25V ~ 5.5V
Voltage - Input Offset (Max)	10mV @ 5V
Current - Output (Typ)	0.015mA @ 5V
Current - Quiescent (Max)	4µA
CMRR, PSRR (Typ)	80dB CMRR, 80dB PSRR
Propagation Delay (Max)	12µs
Hysteresis	50mV
Operating Temperature	0°C ~ 70°C
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution eligibility for the MAX931CPA is determined by the following critical parameters:

Package compatibility: 8-DIP through-hole mounting required for direct PCB replacement
Output type: CMOS and TTL output capability
Supply voltage range: Minimum 2.5V single supply or ±1.25V dual supply operation
Input offset voltage: Maximum 10mV @ 5V
Propagation delay: Maximum 12µs
Hysteresis: 50mV specification
Quiescent current: Maximum 4µA

Substitute parts are grouped into two categories:

Category 1 - Direct Package Replacement (8-DIP Through Hole): Parts maintaining identical 8-DIP package configuration, enabling direct PCB substitution without layout modification.

Category 2 - Functional Equivalent (Alternative Package): Parts meeting electrical specifications but utilizing different package types (8-SOIC surface mount), requiring PCB redesign and assembly process changes.

Parameter Comparison

Parameter	MAX931CPA	MAX931CPA+	LTC1440IN8#PBF	LTC1440CN8#PBF	LMP7300MAX/NOPB
Manufacturer	Analog Devices/Maxim	Analog Devices/Maxim	Analog Devices	Analog Devices	Texas Instruments
Product Status	Obsolete	Active	Active	Active	Active
Package / Case	8-DIP (0.300", 7.62mm)	8-DIP (0.300", 7.62mm)	8-DIP (0.300", 7.62mm)	8-DIP (0.300", 7.62mm)	8-SOIC (0.154", 3.90mm)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Surface Mount
Output Type	CMOS, TTL	CMOS, TTL	CMOS, TTL	CMOS, TTL	CMOS, Open-Collector, 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	2.7V ~ 12V, ±1.35V ~ 6V
Voltage - Input Offset (Max)	10mV @ 5V	10mV @ 5V	10mV @ 5V	10mV @ 5V	0.75mV @ 5V
Current - Output (Typ)	0.015mA @ 5V	0.015mA @ 5V	40mA	40mA	—
Current - Quiescent (Max)	4µA	4µA	4.4µA	4.4µA	13µA
CMRR, PSRR (Typ)	80dB CMRR, 80dB PSRR	80dB CMRR, 80dB PSRR	80dB CMRR, 80dB PSRR	80dB CMRR, 80dB PSRR	100dB CMRR, 100dB PSRR
Propagation Delay (Max)	12µs	12µs	15µs	15µs	15µs
Hysteresis	50mV	50mV	50mV	50mV	1mV
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C	-40°C ~ 85°C	0°C ~ 70°C	-40°C ~ 125°C
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

MAX931CPA+ (Direct Replacement - Recommended for Obsolescence Mitigation)

The MAX931CPA+ is the primary substitute for the obsolete MAX931CPA. Both parts share identical electrical specifications, package configuration (8-DIP through hole), and functional characteristics. The MAX931CPA+ maintains active product status and ROHS3 compliance, addressing regulatory requirements for new production. This part enables direct PCB substitution without design modification. Inventory availability is 5300 units.

LTC1440IN8#PBF and LTC1440CN8#PBF (Package-Compatible Alternatives)

The LTC1440 series (both IN8 and CN8 variants) maintains 8-DIP through-hole packaging, enabling direct PCB replacement. Both variants are manufactured by Analog Devices and hold active product status with ROHS3 compliance. The LTC1440IN8#PBF supports extended operating temperature range (-40°C ~ 85°C) compared to the original specification (0°C ~ 70°C), providing enhanced thermal performance for demanding applications. The LTC1440CN8#PBF maintains the original 0°C ~ 70°C temperature range. Output current capability is significantly higher (40mA typical) compared to the MAX931CPA (0.015mA typical), which may require circuit evaluation for applications with specific output loading requirements. Propagation delay is marginally longer (15µs versus 12µs). Inventory availability: LTC1440IN8#PBF (971 units), LTC1440CN8#PBF (847 units).

LMP7300MAX/NOPB (Functional Equivalent - Surface Mount)

The LMP7300MAX/NOPB is a Texas Instruments comparator with voltage reference meeting core electrical specifications. This part utilizes 8-SOIC surface-mount packaging, requiring PCB redesign and assembly process modification. The LMP7300MAX/NOPB offers superior electrical performance: input offset voltage of 0.75mV (versus 10mV), higher CMRR/PSRR (100dB versus 80dB), and extended operating temperature range (-40°C ~ 125°C). Hysteresis specification is significantly lower (1mV versus 50mV), which may affect circuit behavior in applications dependent on hysteresis characteristics. ROHS3 compliance and active product status are confirmed. Inventory availability is 1500 units. This option is suitable for new designs where surface-mount assembly is standard practice.

Frequently Asked Questions (FAQ)

Q: Can MAX931CPA+ be used as a direct replacement for MAX931CPA?

A: Yes. The MAX931CPA+ is electrically and functionally identical to the MAX931CPA, with identical 8-DIP package configuration. No PCB modification is required. The primary difference is product status (active versus obsolete) and RoHS compliance (ROHS3 compliant versus non-compliant).

Q: What are the key differences between LTC1440IN8#PBF and LTC1440CN8#PBF?

A: Both parts share identical electrical specifications and 8-DIP packaging. The primary difference is operating temperature range: LTC1440IN8#PBF operates from -40°C to 85°C, while LTC1440CN8#PBF operates from 0°C to 70°C. Select based on application temperature requirements.

Q: Can LMP7300MAX/NOPB replace MAX931CPA in existing PCB designs?

A: No direct PCB replacement is possible due to package difference (8-SOIC surface mount versus 8-DIP through hole). LMP7300MAX/NOPB requires PCB redesign and surface-mount assembly capability. This option is suitable for new designs only.

Q: What is the impact of higher output current in LTC1440 series?

A: LTC1440 series provides 40mA typical output current compared to 0.015mA in MAX931CPA. This higher drive capability may require circuit evaluation if the original design relies on specific output impedance or loading characteristics. In most applications, higher output current provides improved performance margin.

Q: Does LMP7300MAX/NOPB hysteresis specification affect compatibility?

A: Yes. LMP7300MAX/NOPB specifies 1mV hysteresis compared to 50mV in MAX931CPA. Applications dependent on 50mV hysteresis for noise immunity or circuit stability require circuit analysis before substitution. The lower hysteresis may improve precision in some applications but reduce noise immunity in others.

Q: Are all substitute parts RoHS compliant?

A: Yes. All active substitute parts (MAX931CPA+, LTC1440IN8#PBF, LTC1440CN8#PBF, LMP7300MAX/NOPB) are ROHS3 compliant. The original MAX931CPA is RoHS non-compliant.

Q: Which substitute part is recommended for new designs?

A: For new through-hole designs, LTC1440IN8#PBF or LTC1440CN8#PBF are recommended based on temperature requirements. For new surface-mount designs, LMP7300MAX/NOPB offers superior electrical performance. For legacy design continuation, MAX931CPA+ provides direct substitution.

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