MAX4131EUA Equivalent & Substitute Parts

Part Overview

The MAX4131EUA is a general-purpose operational amplifier manufactured by Analog Devices Inc./Maxim Integrated, designed for rail-to-rail applications in 8-uMAX/uSOP surface mount packaging. This device is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and procurement continuity. The MAX4131EUA delivers 1 circuit configuration with 4V/µs slew rate and 10 MHz gain bandwidth product, suitable for general-purpose amplification in low-voltage applications.

Substiute Parts

MAX4131EUA

Analog Devices Inc./Maxim IntegratedIn Stock: 9406MAX4131EUA Datasheet

Current PartRFQ

MAX4131EUA+

Analog Devices Inc./Maxim IntegratedIn Stock: 2092MAX4131EUA+ Datasheet

DirectRFQ

INA321EA/2K5

Texas InstrumentsIn Stock: 1735INA321EA/2K5 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MAX4131EUA is determined by strict alignment across the following critical parameters:

Primary Substitution Criteria:

• Amplifier Type classification (General Purpose or Instrumentation)
• Number of Circuits (1 circuit requirement)
• Output Type (Rail-to-Rail capability)
• Package / Case compatibility (8-TSSOP, 8-MSOP form factor)
• Mounting Type (Surface Mount)
• Supply voltage span overlap (minimum 2.7V to 6.5V range)

Secondary Compatibility Factors:

• Slew Rate performance (4V/µs baseline)
• Gain Bandwidth Product (10 MHz baseline)
• Input Bias Current (50 nA baseline)
• Input Offset Voltage (350 µV baseline)
• Output Current capability (50 mA baseline)

The substitute parts identified below meet the primary criteria and are evaluated based on their electrical performance relative to the original specification.

Parameter Comparison

Engineering Selection Recommendations

MAX4131EUA+ (Direct Packaging Variant)

The MAX4131EUA+ is a direct equivalent to the MAX4131EUA with identical electrical specifications and package form factor. The primary distinction is packaging format (Tube versus unspecified for the original) and improved RoHS3 compliance status. This part maintains the same 4V/µs slew rate, 10 MHz gain bandwidth product, and 1mA supply current. The MAX4131EUA+ is classified as obsolete but represents the most direct functional replacement when the original part number becomes unavailable. Inventory availability is 2000 pieces.

INA321EA/2K5 (Functional Alternative)

The INA321EA/2K5 is a Texas Instruments instrumentation amplifier that meets the primary substitution criteria: single circuit, rail-to-rail output, 8-TSSOP/8-MSOP package, and surface mount configuration. This part is classified as Active product status, ensuring long-term availability and supply chain continuity. Key electrical differences include:

• Lower slew rate (0.4V/µs versus 4V/µs)
• Lower -3dB bandwidth (500 kHz versus 10 MHz gain bandwidth product)
• Superior input bias current (0.5 pA versus 50 nA)
• Lower input offset voltage (200 µV versus 350 µV)
• Significantly lower supply current (40 µA versus 1 mA)
• Extended operating temperature range (-55°C to 125°C versus -40°C to 85°C)
• RoHS3 compliant with MSL 2 rating

The INA321EA/2K5 is suitable for applications where lower power consumption, superior input characteristics, and extended temperature operation are beneficial. However, the reduced slew rate and bandwidth may not support high-frequency signal processing requirements of the original MAX4131EUA design.

Both substitute parts carry REACH Unaffected and EAR99 ECCN classifications, matching the original part's regulatory status.

Frequently Asked Questions (FAQ)

Q: Can MAX4131EUA+ be used as a direct replacement for MAX4131EUA?

A: Yes. The MAX4131EUA+ shares identical electrical specifications, package form factor (8-TSSOP, 8-MSOP), and circuit configuration (1 general-purpose amplifier). The primary difference is packaging format and improved RoHS3 compliance. No circuit redesign is required.

Q: What are the key differences between MAX4131EUA and INA321EA/2K5?

A: The MAX4131EUA is a general-purpose amplifier with 4V/µs slew rate and 10 MHz gain bandwidth product. The INA321EA/2K5 is an instrumentation amplifier with 0.4V/µs slew rate and 500 kHz bandwidth. The INA321EA/2K5 offers superior input bias current (0.5 pA), lower supply current (40 µA), and extended temperature range (-55°C to 125°C). Selection depends on whether the application requires high-speed signal processing or low-power, precision input characteristics.

Q: Are all substitute parts compatible with the same PCB layout?

A: Yes. All three parts (MAX4131EUA, MAX4131EUA+, and INA321EA/2K5) use identical 8-TSSOP/8-MSOP package form factors with 0.118" width and 3.00mm body dimensions. PCB footprints are interchangeable without layout modification.

Q: What is the supply voltage compatibility range for substitution?

A: The MAX4131EUA operates from 2.7V to 6.5V. The MAX4131EUA+ maintains this range. The INA321EA/2K5 operates from 2.5V to 5.5V. For applications using supply voltages between 5.5V and 6.5V, only the MAX4131EUA or MAX4131EUA+ are suitable.

Q: Why is the MAX4131EUA classified as obsolete?

A: The MAX4131EUA is listed as obsolete by the manufacturer. This status indicates the part is no longer in active production. Existing inventory remains available, but long-term procurement should transition to active alternatives such as the INA321EA/2K5 or equivalent current-generation devices.

Q: What is the difference in RoHS compliance between the parts?

A: The MAX4131EUA is RoHS non-compliant. Both MAX4131EUA+ and INA321EA/2K5 are ROHS3 compliant. For applications requiring RoHS compliance, the MAX4131EUA+ or INA321EA/2K5 must be selected.

Q: How do moisture sensitivity levels affect handling and storage?

A: The MAX4131EUA and MAX4131EUA+ carry MSL 1 (Unlimited), indicating no moisture sensitivity restrictions. The INA321EA/2K5 carries MSL 2 (1 Year), requiring storage in controlled humidity environments and baking before reflow if shelf life exceeds one year. Standard ESD and moisture control practices apply to all parts.

Q: Can INA321EA/2K5 replace MAX4131EUA in high-frequency applications?

A: No. The INA321EA/2K5 has a -3dB bandwidth of 500 kHz, significantly lower than the MAX4131EUA's 10 MHz gain bandwidth product. Applications requiring signal processing above 500 kHz must use the MAX4131EUA or MAX4131EUA+.