MAX4238ASA Equivalent & Substitute Parts

Part Overview

The MAX4238ASA 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 MAX4238ASA operates across a 2.7V to 5.5V supply range with a 1 MHz gain-bandwidth product, suitable for low-power analog signal conditioning applications.

Substiute Parts

MAX4238ASA

Analog Devices Inc./Maxim IntegratedIn Stock: 1938MAX4238ASA Datasheet

Current PartRFQ

MAX4238ASA+

Analog Devices Inc./Maxim IntegratedIn Stock: 3320MAX4238ASA+ Datasheet

DirectRFQ

OPA335AID

Texas InstrumentsIn Stock: 2421OPA335AID Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the MAX4238ASA are identified based on strict electrical and mechanical compatibility criteria. The primary substitution logic is based on the following parameters:

Mechanical Compatibility: All substitute parts must use the 8-SOIC (0.154", 3.90mm Width) surface mount package to ensure direct PCB footprint compatibility without layout modifications.

Electrical Compatibility: Substitute parts must support the same supply voltage range (2.7V to 5.5V minimum and maximum), operate within the same temperature range (-40°C to 125°C), and provide single-ended, rail-to-rail output configuration.

Functional Equivalence: The substitute must be a single-circuit operational amplifier suitable for general-purpose analog signal processing applications.

Regulatory Compliance: All substitute parts must maintain ROHS3 compliance and REACH unaffected status to meet current environmental and regulatory requirements.

The identified substitutes are grouped into two categories: direct manufacturer equivalents and cross-manufacturer alternatives. Direct equivalents maintain identical electrical specifications, while cross-manufacturer alternatives provide enhanced performance characteristics within the same mechanical and supply voltage constraints.

Parameter Comparison

Engineering Selection Recommendations

MAX4238ASA+ (Direct Manufacturer Equivalent)

The MAX4238ASA+ is the primary substitute for the obsolete MAX4238ASA. Both devices are manufactured by Analog Devices Inc./Maxim Integrated and share identical electrical specifications, including slew rate (0.35V/µs), gain-bandwidth product (1 MHz), input bias current (1 pA), and input offset voltage (0.1 µV). The MAX4238ASA+ is classified as an active product, ensuring long-term availability and supply chain continuity. The only difference is packaging format: MAX4238ASA+ is supplied in tube packaging, whereas the original MAX4238ASA packaging is not specified. Both devices maintain ROHS3 compliance, REACH unaffected status, and MSL 1 (Unlimited) moisture sensitivity rating. This substitute provides direct functional and electrical replacement without design modifications.

OPA335AID (Cross-Manufacturer Alternative)

The OPA335AID, manufactured by Texas Instruments, is a zero-drift operational amplifier that operates within the same supply voltage range (2.7V to 5.5V) and temperature range (-40°C to 125°C) as the MAX4238ASA. The OPA335AID is housed in the same 8-SOIC surface mount package, ensuring mechanical compatibility. This device offers enhanced performance characteristics: slew rate of 1.6V/µs (4.6× faster than MAX4238ASA), gain-bandwidth product of 2 MHz (2× higher), and lower supply current of 285µA (52.5% reduction). The OPA335AID maintains ROHS3 compliance and REACH unaffected status. However, the OPA335AID has a higher input bias current (70 pA versus 1 pA) and higher input offset voltage (1 µV versus 0.1 µV), and carries MSL 2 (1 Year) moisture sensitivity rating compared to MSL 1 (Unlimited) for the MAX4238ASA. The OPA335AID is suitable for applications requiring improved dynamic performance and lower power consumption, provided that the higher input offset voltage and bias current are acceptable within the circuit design margins.

Frequently Asked Questions (FAQ)

Q: Can MAX4238ASA+ be used as a direct replacement for MAX4238ASA without circuit modifications?

A: Yes. The MAX4238ASA+ shares identical electrical specifications with the MAX4238ASA, including slew rate, gain-bandwidth product, input bias current, input offset voltage, supply current, output current, and operating temperature range. Both devices support the same 2.7V to 5.5V supply voltage range and are housed in the 8-SOIC surface mount package. No circuit modifications are required for substitution.

Q: What are the key differences between MAX4238ASA+ and OPA335AID?

A: The MAX4238ASA+ and OPA335AID differ in amplifier architecture and performance characteristics. MAX4238ASA+ is a general-purpose amplifier with 0.35V/µs slew rate and 1 MHz gain-bandwidth product. OPA335AID is a zero-drift amplifier with 1.6V/µs slew rate and 2 MHz gain-bandwidth product. OPA335AID consumes 285µA supply current versus 600µA for MAX4238ASA+, but has higher input bias current (70 pA versus 1 pA) and higher input offset voltage (1 µV versus 0.1 µV). Both operate across -40°C to 125°C and support 2.7V to 5.5V supply range in 8-SOIC packaging.

Q: Is the OPA335AID suitable for applications requiring low input offset voltage?

A: The OPA335AID has an input offset voltage of 1 µV, which is 10 times higher than the MAX4238ASA (0.1 µV). For applications with strict input offset voltage requirements below 1 µV, the OPA335AID may not be suitable. The MAX4238ASA+ maintains the original 0.1 µV input offset voltage specification and is the preferred choice for such applications.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. Both MAX4238ASA+ and OPA335AID are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for electronic components.

Q: What is the difference in moisture sensitivity between the substitutes?

A: MAX4238ASA and MAX4238ASA+ carry MSL 1 (Unlimited) moisture sensitivity rating, indicating no moisture sensitivity limitations. OPA335AID carries MSL 2 (1 Year) rating, requiring storage and handling within a 1-year moisture sensitivity window. For applications with extended storage periods or high-humidity environments, MAX4238ASA+ is the preferred choice.

Q: Can OPA335AID be used in applications where lower power consumption is critical?

A: Yes. OPA335AID consumes 285µA supply current, representing a 52.5% reduction compared to the 600µA of MAX4238ASA+. For battery-powered or low-power applications, OPA335AID provides significant power consumption advantages. However, verify that the higher input bias current (70 pA) and input offset voltage (1 µV) are acceptable within the circuit design specifications.

Q: Are all substitute parts available in the same package?

A: Yes. MAX4238ASA, MAX4238ASA+, and OPA335AID are all available in 8-SOIC (0.154", 3.90mm Width) surface mount packaging, ensuring direct PCB footprint compatibility without layout modifications.