MAX931ESA-T Equivalent & Substitute Parts

Part Overview

The MAX931ESA-T is a single-channel comparator with integrated voltage reference, manufactured by Analog Devices Inc./Maxim Integrated. This device operates across a wide supply voltage range (2.5V to 11V single supply, ±1.25V to ±5.5V dual supply) and is housed in an 8-SOIC surface-mount package. The part is currently obsolete, with 3,516 units available in new original stock. Due to its obsolete status, equivalent and substitute parts from active product lines are necessary for new designs and ongoing production requirements.

Key Parameters

Parameter	MAX931ESA-T
Manufacturer	Analog Devices Inc./Maxim Integrated
Product Status	Obsolete
Package / Case	8-SOIC (0.154", 3.90mm Width)
Type	Comparator with Voltage Reference
Output Type	CMOS, TTL
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
Propagation Delay (Max)	12µs
Hysteresis	50mV
Operating Temperature	-40°C ~ 85°C
RoHS Status	ROHS3 Compliant
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution for the MAX931ESA-T is determined by the following critical parameters:

Electrical Compatibility:

Output type (CMOS, TTL capability)
Supply voltage range (minimum 2.5V single supply or ±1.25V dual supply)
Input offset voltage (≤10mV @ 5V)
Hysteresis (50mV)
Propagation delay (≤12µs preferred for timing-critical applications)
Quiescent current (≤4µA preferred for low-power designs)

Physical Compatibility:

Package type (8-SOIC surface mount)
Pin count and pinout alignment

Regulatory Compliance:

RoHS3 compliance
Operating temperature range (-40°C to 85°C minimum)

Substitutes are grouped into two categories:

Direct Equivalent (Same Manufacturer): MAX931ESA+T maintains identical electrical specifications and is the direct replacement from Analog Devices Inc./Maxim Integrated, with active product status and improved availability.

Functional Equivalents (Alternative Manufacturers): LMP7300 series (Texas Instruments) and LTC1440/LTC1540 series (Analog Devices Inc.) provide comparable functionality within the allowed parameter ranges. These parts meet or exceed the electrical requirements while offering active product status and higher inventory levels.

Parameter Comparison

Parameter	MAX931ESA-T	MAX931ESA+T	LMP7300MA/NOPB	LTC1440CS8#PBF	LTC1540CS8#PBF
Manufacturer	Analog Devices/Maxim	Analog Devices/Maxim	Texas Instruments	Analog Devices	Analog Devices
Product Status	Obsolete	Active	Active	Active	Active
Package	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC
Output Type	CMOS, TTL	CMOS, TTL	CMOS, Open-Collector, TTL	CMOS, TTL	CMOS, TTL
Supply Voltage (Single)	2.5V ~ 11V	2.5V ~ 11V	2.7V ~ 12V	2V ~ 11V	2V ~ 11V
Supply Voltage (Dual)	±1.25V ~ 5.5V	±1.25V ~ 5.5V	±1.35V ~ 6V	±1V ~ 5.5V	±1V ~ 5.5V
Input Offset (Max) @ 5V	10mV	10mV	0.75mV	10mV	12mV
Quiescent Current (Max)	4µA	4µA	13µA	4.4µA	680nA
CMRR (Typ)	80dB	80dB	100dB	80dB	80dB
Propagation Delay (Max)	12µs	12µs	15µs	15µs	60µs
Hysteresis	50mV	50mV	1mV	50mV	50mV
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 125°C	0°C ~ 70°C	0°C ~ 70°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Recommended Primary Choice): MAX931ESA+T is the optimal substitute. It maintains identical electrical specifications and pinout compatibility with the obsolete MAX931ESA-T while offering active product status and significantly higher inventory availability (25,200 units). This part requires no circuit redesign and provides the shortest qualification timeline.

For Alternative Sourcing:

LMP7300MA/NOPB (Texas Instruments) is suitable when MAX931ESA+T availability is constrained. It exceeds the original specifications in CMRR (100dB vs. 80dB) and input offset voltage (0.75mV vs. 10mV), with extended operating temperature range (-40°C to 125°C). The open-collector output option provides additional design flexibility. Propagation delay is slightly longer (15µs vs. 12µs), which is acceptable for most applications. Hysteresis is significantly lower (1mV vs. 50mV), requiring circuit evaluation for applications dependent on the original hysteresis specification.

LTC1440CS8#PBF and LTC1440IS8#PBF (Analog Devices) provide functional equivalence with identical hysteresis and input offset specifications. LTC1440IS8#PBF extends the operating temperature range to -40°C to 85°C, matching the original part. Propagation delay is marginally longer (15µs vs. 12µs). These parts are suitable for designs where the 50mV hysteresis is critical.

LTC1540CS8#PBF and LTC1540IS8#PBF (Analog Devices) offer ultra-low quiescent current (680nA to 710nA vs. 4µA), beneficial for battery-powered applications. However, propagation delay is significantly longer (60µs vs. 12µs), making these parts unsuitable for timing-critical comparator applications. LTC1540IS8#PBF supports the full -40°C to 85°C operating temperature range.

Packaging Considerations: All substitute parts are available in 8-SOIC surface-mount packaging with identical footprints. Tube and Tape & Reel packaging options are available across all substitutes to match procurement requirements.

Compliance: All substitute parts maintain ROHS3 compliance and are REACH unaffected, meeting regulatory requirements equivalent to the original part.

Frequently Asked Questions (FAQ)

Q: Can MAX931ESA+T be used as a direct drop-in replacement for MAX931ESA-T? A: Yes. MAX931ESA+T is electrically and mechanically identical to MAX931ESA-T, with the same pinout, package, and electrical specifications. The only difference is product status (active vs. obsolete) and packaging format options. No circuit modifications are required.

Q: What is the primary difference between LMP7300MA/NOPB and MAX931ESA-T? A: LMP7300MA/NOPB offers superior performance in CMRR (100dB vs. 80dB) and input offset voltage (0.75mV vs. 10mV), with extended temperature range to 125°C. The key trade-off is significantly lower hysteresis (1mV vs. 50mV). Applications requiring precise 50mV hysteresis should evaluate circuit impact before substitution.

Q: Why is LTC1540 propagation delay so much longer than the original part? A: LTC1540 is optimized for ultra-low quiescent current operation (680nA), which inherently results in slower propagation delay (60µs). This part is intended for low-power, non-timing-critical applications. For timing-sensitive circuits, LTC1440 or MAX931ESA+T are more appropriate.

Q: Are all substitute parts available in 8-SOIC packaging? A: Yes. All listed substitutes are available in 8-SOIC surface-mount packaging with identical footprints to MAX931ESA-T. Packaging format options (tube, tape & reel, cut tape) vary by part number and manufacturer.

Q: What is the temperature range limitation for LTC1440 and LTC1540 commercial-grade parts? A: LTC1440CS8#PBF and LTC1540CS8#PBF are rated for 0°C to 70°C. For applications requiring -40°C to 85°C operation, use LTC1440IS8#PBF or LTC1540IS8#PBF (industrial-grade variants).

Q: Can I use LMP7300MMX/NOPB as a substitute if 8-SOIC is not available? A: LMP7300MMX/NOPB is packaged in 8-VSSOP (0.118", 3.00mm width), which has a different footprint than the 8-SOIC (0.154", 3.90mm width) required for MAX931ESA-T. PCB layout redesign would be necessary. If 8-SOIC packaging is required, use LMP7300MA/NOPB instead.

Q: Are all substitutes RoHS3 compliant? A: Yes. All listed substitute parts are ROHS3 compliant and REACH unaffected, meeting the same regulatory requirements as MAX931ESA-T.

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