MAX4239ASA-T Equivalent & Substitute Parts

Part Overview

The MAX4239ASA-T 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 functionally equivalent alternatives essential for ongoing design support and production continuity. The MAX4239ASA-T delivers 1.6V/µs slew rate with 6.5 MHz gain bandwidth product, suitable for precision signal conditioning and general analog processing applications requiring low input bias current (1 pA) and minimal input offset voltage (0.1 µV).

Substiute Parts

MAX4239ASA-T

Analog Devices Inc./Maxim IntegratedIn Stock: 1129MAX4239ASA-T Datasheet

Current PartRFQ

MAX4239ASA+T

Analog Devices Inc./Maxim IntegratedIn Stock: 966MAX4239ASA+T Datasheet

DirectRFQ

OPA341UA

Burr BrownIn Stock: 6764OPA341UA Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MAX4239ASA-T is determined by strict alignment across the following critical parameters:

Primary Substitution Criteria:

• Amplifier Type: General Purpose
• Number of Circuits: 1
• Output Type: Single Ended, Rail-to-Rail
• Package / Case: 8-SOIC (0.154", 3.90mm Width)
• Mounting Type: Surface Mount

Secondary Compatibility Parameters:

• Voltage - Supply Span (Min): ≥ 2.7 V
• Voltage - Supply Span (Max): ≤ 5.5 V
• Operating Temperature Range: Must encompass -40°C to 125°C or be compatible with application requirements

Substitute parts must maintain electrical performance within the specified supply voltage window and temperature operating range. Slew rate, gain bandwidth product, input bias current, and output current specifications are application-dependent and must be evaluated against circuit requirements.

Parameter Comparison

Engineering Selection Recommendations

MAX4239ASA+T (Direct Substitute - Recommended for Obsolescence Mitigation)

The MAX4239ASA+T is the primary equivalent for MAX4239ASA-T replacement. Both parts share identical electrical specifications, package geometry, and thermal characteristics. The MAX4239ASA+T differs only in packaging format (Tape & Reel versus bulk) and maintains Active product status with Analog Devices Inc./Maxim Integrated. This part is ROHS3 compliant with MSL 1 rating, ensuring compatibility with modern manufacturing processes. Selection of MAX4239ASA+T eliminates obsolescence risk while preserving circuit performance without redesign.

OPA341UA (Alternative Substitute - Application-Dependent)

The OPA341UA manufactured by Burr Brown provides functional equivalence within the 8-SOIC package and rail-to-rail output topology. This device operates across the required supply voltage range (2.5V to 5.5V) and extended temperature range (-55°C to 125°C). Key differences include higher slew rate (6V/µs versus 1.6V/µs), slightly lower gain bandwidth product (5.5 MHz versus 6.5 MHz), and significantly higher input offset voltage (2 mV versus 0.1 µV). The OPA341UA is suitable for applications where precision offset voltage is not critical and higher slew rate performance is beneficial. Active product status ensures long-term availability.

Compliance and Certification Considerations

Both substitute parts maintain surface mount 8-SOIC packaging compatible with existing PCB layouts. The MAX4239ASA+T provides direct compliance continuity with ROHS3 and MSL 1 certifications. The OPA341UA compliance status is not specified in available documentation and must be verified against specific procurement requirements before selection.

Frequently Asked Questions (FAQ)

Q: Can MAX4239ASA+T be used as a direct replacement for MAX4239ASA-T without circuit modification?

A: Yes. The MAX4239ASA+T is electrically and mechanically identical to MAX4239ASA-T. Both parts deliver identical slew rate (1.6V/µs), gain bandwidth product (6.5 MHz), input bias current (1 pA), and input offset voltage (0.1 µV). The only difference is packaging format (Tape & Reel versus bulk). No circuit redesign is required.

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

A: The primary differences are input offset voltage (0.1 µV for MAX4239ASA+T versus 2 mV for OPA341UA) and slew rate (1.6V/µs versus 6V/µs). The OPA341UA provides faster signal transitions but with reduced precision in offset voltage. Both operate across compatible supply voltage ranges and 8-SOIC packages. Selection depends on whether precision offset voltage or higher slew rate is required for the application.

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

A: Yes. All three parts (MAX4239ASA-T, MAX4239ASA+T, and OPA341UA) use identical 8-SOIC (0.154", 3.90mm Width) surface mount packaging. Pin-to-pin compatibility is maintained, allowing direct substitution on existing PCBs without layout modification.

Q: What is the significance of the MAX4239ASA-T obsolete status?

A: Obsolete status indicates the part is no longer manufactured by Analog Devices Inc./Maxim Integrated. The MAX4239ASA+T (Active status) is the direct replacement, ensuring continued availability and manufacturing support. For new designs or long-term production, MAX4239ASA+T is the recommended selection.

Q: Does OPA341UA require different supply voltage configuration?

A: No. The OPA341UA operates across 2.5V to 5.5V supply range, which encompasses the MAX4239ASA-T range of 2.7V to 5.5V. Existing supply voltage configurations are compatible. However, the extended lower limit (2.5V) provides additional flexibility for low-voltage applications.

Q: What is the impact of higher input offset voltage in OPA341UA?

A: The OPA341UA input offset voltage of 2 mV is 20,000 times higher than MAX4239ASA-T (0.1 µV). This difference is significant for precision instrumentation, sensor signal conditioning, and low-level analog processing. For general-purpose amplification where offset voltage is not critical, this difference is negligible. Application requirements determine acceptability.

Q: Are there packaging or moisture sensitivity concerns with these substitutes?

A: MAX4239ASA+T maintains identical MSL 1 (Unlimited) rating and ROHS3 compliance as the original part. OPA341UA compliance specifications are not provided. For applications requiring specific moisture sensitivity or environmental compliance certifications, MAX4239ASA+T is the preferred selection.