MAX931CSA-T Equivalent & Substitute Parts

Part Overview

The MAX931CSA-T is a comparator with integrated voltage reference manufactured by Analog Devices Inc./Maxim Integrated. This device integrates a single comparator element with CMOS and TTL output capability in an 8-SOIC surface mount package. The part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. The MAX931CSA-T operates across a supply voltage range of 2.5V to 11V (single supply) or ±1.25V to ±5.5V (dual supply), with a maximum input offset voltage of 10mV at 5V and a propagation delay of 12µs maximum.

Substiute Parts

MAX931CSA-T

Analog Devices Inc./Maxim IntegratedIn Stock: 1063MAX931CSA-T Datasheet

Current PartRFQ

MAX931CSA+T

Analog Devices Inc./Maxim IntegratedIn Stock: 2167MAX931CSA+T Datasheet

DirectRFQ

LMP7300MA/NOPB

Texas InstrumentsIn Stock: 1654LMP7300MA/NOPB Datasheet

MFR RecommendedRFQ

LMP7300MMX/NOPB

Texas InstrumentsIn Stock: 2234LMP7300MMX/NOPB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MAX931CSA-T is determined by the following critical parameters:

Electrical Compatibility Requirements:

• Output Type: CMOS and TTL compatible output stages
• Supply Voltage Range: Minimum 2.5V to 11V single supply capability
• Input Offset Voltage: Maximum 10mV at 5V
• Propagation Delay: Maximum 12µs
• Quiescent Current: Maximum 4µA
• CMRR/PSRR: Minimum 80dB

Package Compatibility:

• 8-pin SOIC or equivalent footprint (0.154", 3.90mm width)
• Surface mount technology

Compliance Requirements:

• ROHS3 Compliant
• Active or Obsolete product status acceptable for direct replacement

The substitute parts identified meet these electrical and mechanical criteria while maintaining functional equivalence for the MAX931CSA-T application.

Parameter Comparison

Engineering Selection Recommendations

MAX931CSA+T (Direct Manufacturer Upgrade)

The MAX931CSA+T is the direct active equivalent of the MAX931CSA-T, manufactured by Analog Devices Inc./Maxim Integrated. This part maintains identical electrical specifications and operates in the same 8-SOIC package. The primary distinction is product status: MAX931CSA+T is active, whereas MAX931CSA-T is obsolete. The packaging format differs (Tape & Reel versus standard), but the die and functional performance are equivalent. This part is recommended for designs requiring the exact electrical and thermal characteristics of the original MAX931CSA-T with the advantage of active product support and ongoing availability.

LMP7300MA/NOPB (Texas Instruments Alternative - 8-SOIC)

The LMP7300MA/NOPB is a Texas Instruments comparator with voltage reference in an 8-SOIC package. This part exceeds the electrical specifications of the MAX931CSA-T in several parameters: input offset voltage of 0.75mV (versus 10mV), CMRR/PSRR of 100dB (versus 80dB), and extended operating temperature range of -40°C to 125°C (versus 0°C to 70°C). The supply voltage range is slightly broader (2.7V to 12V single supply). Quiescent current is higher at 13µA maximum. The LMP7300MA/NOPB is suitable for applications where improved precision and wider temperature operation are beneficial. Packaging is Tube format.

LMP7300MMX/NOPB (Texas Instruments Alternative - 8-VSSOP)

The LMP7300MMX/NOPB is functionally equivalent to the LMP7300MA/NOPB but packaged in 8-VSSOP (0.118", 3.00mm width) instead of 8-SOIC. This smaller footprint option provides the same electrical performance: 1mV input offset voltage, 100dB CMRR/PSRR, and -40°C to 125°C operating temperature. The LMP7300MMX/NOPB is available in Tape & Reel packaging. Selection of this part requires PCB layout modification to accommodate the different package geometry.

All substitute parts are ROHS3 compliant and maintain active product status with established supply chains.

Frequently Asked Questions (FAQ)

Q: Can MAX931CSA+T directly replace MAX931CSA-T without circuit modification?

A: Yes. The MAX931CSA+T is electrically and functionally identical to the MAX931CSA-T. Both operate with identical supply voltage ranges (2.5V to 11V single supply, ±1.25V to ±5.5V dual supply), input offset voltage (10mV @ 5V), propagation delay (12µs), and hysteresis (50mV). The 8-SOIC package footprint is identical. No circuit modification is required.

Q: What are the key differences between the MAX931CSA-T and LMP7300 series?

A: The LMP7300 series (both MA and MMX variants) offers improved precision with lower input offset voltage (0.75mV to 1mV versus 10mV) and superior CMRR/PSRR performance (100dB versus 80dB). The LMP7300 series extends the operating temperature range to -40°C to 125°C. Quiescent current is higher at 13µA maximum. Hysteresis is significantly lower at 1mV. These differences make the LMP7300 series suitable for precision measurement applications requiring lower offset and wider temperature operation.

Q: Is the LMP7300MMX/NOPB pin-compatible with the MAX931CSA-T?

A: No. The LMP7300MMX/NOPB uses an 8-VSSOP package (0.118", 3.00mm width) while the MAX931CSA-T uses an 8-SOIC package (0.154", 3.90mm width). Although both are 8-pin packages, the physical dimensions and pin spacing differ. PCB layout modification is required for this substitution.

Q: Can the LMP7300MA/NOPB replace the MAX931CSA-T in the same PCB?

A: Yes. The LMP7300MA/NOPB is packaged in 8-SOIC (0.154", 3.90mm width), matching the MAX931CSA-T footprint. Pin compatibility is maintained. The LMP7300MA/NOPB can be used as a direct PCB replacement without layout modification.

Q: What is the significance of the hysteresis difference between MAX931CSA-T (50mV) and LMP7300 series (1mV)?

A: Hysteresis defines the voltage difference between rising and falling threshold transitions. The MAX931CSA-T provides 50mV hysteresis, which prevents oscillation in applications with slow-moving input signals or noisy environments. The LMP7300 series provides 1mV hysteresis, suitable for precision threshold detection where minimal hysteresis is required. Application requirements determine which hysteresis value is appropriate.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. The MAX931CSA+T, LMP7300MA/NOPB, and LMP7300MMX/NOPB are all ROHS3 compliant with Moisture Sensitivity Level 1 (Unlimited). All parts meet current environmental and regulatory requirements.