MAX4239ASA Equivalent & Substitute Parts

Part Overview

The MAX4239ASA is a general-purpose operational amplifier manufactured by Analog Devices Inc./Maxim Integrated, designed for single-ended, rail-to-rail applications in 8-SOIC surface mount packaging. This device is classified as obsolete, making identification of equivalent and substitute parts essential for ongoing design support, production continuity, and system maintenance. The MAX4239ASA operates across a 2.7V to 5.5V supply range with a gain bandwidth product of 6.5 MHz and is suitable for low-power analog signal processing applications.

Substiute Parts

MAX4239ASA

Analog Devices Inc./Maxim IntegratedIn Stock: 1934MAX4239ASA Datasheet

Current PartRFQ

MAX4239ASA+

Analog Devices Inc./Maxim IntegratedIn Stock: 1416MAX4239ASA+ Datasheet

DirectRFQ

OPA341UA

Burr BrownIn Stock: 6764OPA341UA Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the MAX4239ASA are identified based on strict electrical and mechanical parameter compatibility within the general-purpose operational amplifier category. The substitution logic is based on the following critical parameters:

Mechanical Compatibility: All substitute parts must use the 8-SOIC surface mount package with 0.154" (3.90mm) width to ensure PCB footprint compatibility.

Electrical Compatibility: Substitute parts must support the same supply voltage range (2.7V to 5.5V minimum and maximum) to function in existing circuit designs without modification.

Functional Compatibility: All parts must be single-ended, rail-to-rail output operational amplifiers with general-purpose application capability.

Performance Parameters: While exact parameter matching is not required for substitution, parts must operate within acceptable ranges for slew rate, gain bandwidth product, input bias current, and output current to maintain circuit performance.

The MAX4239ASA has two identified substitutes: MAX4239ASA+ (direct manufacturer variant) and OPA341UA (cross-manufacturer alternative).

Parameter Comparison

Engineering Selection Recommendations

MAX4239ASA+ (Direct Manufacturer Equivalent)

The MAX4239ASA+ is the primary substitute for the obsolete MAX4239ASA. This part is manufactured by the same company (Analog Devices Inc./Maxim Integrated) and shares identical electrical specifications, including slew rate, gain bandwidth product, input bias current, input offset voltage, and supply current. The MAX4239ASA+ maintains the same 8-SOIC package footprint and operating temperature range. The key distinction is product status: MAX4239ASA+ is active and currently in production, ensuring long-term availability. Both parts are ROHS3 compliant with MSL 1 rating. The MAX4239ASA+ is packaged in tube format, whereas the original part's packaging format is not specified. This substitute provides direct functional and electrical compatibility with no design modifications required.

OPA341UA (Cross-Manufacturer Alternative)

The OPA341UA, manufactured by Burr Brown, is a general-purpose operational amplifier that meets the core mechanical and electrical compatibility requirements for substitution. It operates within the required 2.5V to 5.5V supply range (with a lower minimum voltage of 2.5V compared to 2.7V), uses the same 8-SOIC surface mount package, and provides rail-to-rail output capability. The OPA341UA is currently in active production status. Performance differences include a higher slew rate (6V/µs versus 1.6V/µs), lower input bias current (0.6 pA versus 1 pA), higher input offset voltage (2 mV versus 0.1 µV), and higher supply current (750µA versus 600µA). The OPA341UA supports an extended operating temperature range (-55°C to 125°C versus -40°C to 125°C). This substitute is suitable for applications where the performance variations are acceptable and where cross-manufacturer sourcing is required for supply chain resilience.

Frequently Asked Questions (FAQ)

Q: Can MAX4239ASA+ be used as a direct replacement for MAX4239ASA?

A: Yes. The MAX4239ASA+ is electrically and mechanically identical to the MAX4239ASA. Both parts share the same slew rate (1.6V/µs), gain bandwidth product (6.5 MHz), input bias current (1 pA), input offset voltage (0.1 µV), supply current (600µA), and operating temperature range (-40°C to 125°C). Both use 8-SOIC surface mount packaging. The primary difference is product status: MAX4239ASA+ is active and available, while MAX4239ASA is obsolete. No circuit modifications are required for this substitution.

Q: What are the key differences between MAX4239ASA and OPA341UA?

A: The OPA341UA differs in several performance parameters. It has a higher slew rate (6V/µs versus 1.6V/µs), lower input bias current (0.6 pA versus 1 pA), higher input offset voltage (2 mV versus 0.1 µV), and higher supply current (750µA versus 600µA). The OPA341UA also supports a lower minimum supply voltage (2.5V versus 2.7V) and an extended temperature range (-55°C to 125°C versus -40°C to 125°C). Both parts use identical 8-SOIC packaging and are rail-to-rail output amplifiers.

Q: Will OPA341UA work in a circuit designed for MAX4239ASA?

A: The OPA341UA is mechanically compatible (same 8-SOIC package) and electrically compatible (same supply voltage range, rail-to-rail output, general-purpose amplifier function). However, the performance differences must be evaluated for the specific application. The higher slew rate and lower input bias current of the OPA341UA are generally beneficial. The higher input offset voltage (2 mV versus 0.1 µV) may affect precision applications. The higher supply current (750µA versus 600µA) increases power consumption. Circuit simulation or testing is recommended for applications with tight performance specifications.

Q: Are all three parts (MAX4239ASA, MAX4239ASA+, OPA341UA) pin-compatible?

A: Yes. All three parts use the 8-SOIC surface mount package with 0.154" (3.90mm) width, ensuring identical PCB footprints and pin assignments. No PCB redesign is required when substituting between these parts.

Q: What is the supply voltage compatibility range for these parts?

A: MAX4239ASA and MAX4239ASA+ operate from 2.7V to 5.5V. OPA341UA operates from 2.5V to 5.5V. All three parts are compatible with standard single-supply (3.3V, 5V) and dual-supply configurations within these ranges.

Q: Are there any compliance or certification differences between these parts?

A: MAX4239ASA and MAX4239ASA+ are both ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating. RoHS and MSL status for OPA341UA is not specified in the provided data. For applications requiring specific compliance certifications, verification with the manufacturer is recommended.

Q: Which substitute should be selected for new designs?

A: For new designs, MAX4239ASA+ is recommended as the primary choice due to identical electrical specifications, active production status, and ROHS3 compliance. OPA341UA is suitable as a secondary option for applications requiring cross-manufacturer sourcing or where the performance differences (higher slew rate, lower input bias current) are beneficial.