MAX4285ESA Equivalent & Substitute Parts Reference

Part Overview

The MAX4285ESA is a buffer amplifier integrated circuit manufactured by Analog Devices Inc./Maxim Integrated, housed in an 8-SOIC surface mount package. This device is classified as obsolete, with 2000 units currently in stock. The MAX4285ESA operates as a single-circuit buffer amplifier designed for signal conditioning and impedance matching applications. Due to its obsolete product status, identifying equivalent substitute parts is necessary for ongoing design support, production continuity, and long-term component availability assurance.

Substiute Parts

MAX4285ESA

Analog Devices Inc./Maxim IntegratedIn Stock: 2050MAX4285ESA Datasheet

Current PartRFQ

AD8038ARZ

Analog Devices Inc.In Stock: 1484AD8038ARZ Datasheet

MFR RecommendedRFQ

AD8038ARZ-REEL

Analog Devices Inc.In Stock: 2507AD8038ARZ-REEL Datasheet

MFR RecommendedRFQ

AD8038ARZ-REEL7

Analog Devices Inc.In Stock: 7581AD8038ARZ-REEL7 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the MAX4285ESA are identified based on strict electrical and mechanical compatibility criteria. The primary substitutes are variants of the AD8038 amplifier family from Analog Devices Inc., available under three distinct manufacturer part numbers: AD8038ARZ, AD8038ARZ-REEL, and AD8038ARZ-REEL7.

Substitution Logic:

The AD8038 series qualifies as functional equivalents based on the following allowed parameters:

• Package Compatibility: All substitute parts maintain the identical 8-SOIC (0.154", 3.90mm Width) surface mount package, ensuring direct PCB footprint compatibility without layout modifications.
• Single Circuit Configuration: All substitutes contain exactly one amplifier circuit, matching the MAX4285ESA circuit count.
• Operating Temperature Range: All substitutes support the -40°C to 85°C operating temperature range, maintaining thermal envelope compatibility.
• Supply Voltage Overlap: The AD8038 series supports 3V to 12V supply span, which encompasses and exceeds the MAX4285ESA range of 2.85V to 6.5V.
• Surface Mount Technology: All substitutes use surface mount mounting type, compatible with existing assembly processes.

Key Differentiating Parameters:

The AD8038 series exhibits superior electrical performance characteristics compared to the MAX4285ESA:

• Slew Rate: 425 V/µs (versus 385 V/µs)
• -3dB Bandwidth: 350 MHz (versus 220 MHz)
• Input Bias Current: 400 nA (versus 13 µA)
• Supply Current: 1 mA (versus 23 mA)

These enhancements represent performance improvements rather than incompatibilities, making the AD8038 variants suitable for direct substitution in applications where the MAX4285ESA was originally specified.

Parameter Comparison

Engineering Selection Recommendations

Product Status Consideration:

The MAX4285ESA carries an obsolete product status, indicating discontinued manufacturing and limited long-term availability. The AD8038 series variants (AD8038ARZ, AD8038ARZ-REEL, AD8038ARZ-REEL7) all maintain active product status, ensuring ongoing manufacturing support, availability, and technical documentation access.

Compliance and Certification:

The MAX4285ESA is RoHS non-compliant. All three AD8038 substitute variants achieve ROHS3 compliance, meeting current regulatory requirements for electronic component manufacturing and assembly. Both the original part and all substitutes maintain REACH Unaffected status and EAR99 export classification, with identical HTSUS commodity codes (8542.33.0001).

Packaging and Supply Chain:

Three distinct AD8038 variants are available to accommodate different procurement and assembly workflows:

• AD8038ARZ (Tube packaging): Suitable for lower-volume applications and manual assembly processes. Current inventory: 1430 units.
• AD8038ARZ-REEL (standard reel format): Appropriate for automated pick-and-place assembly with standard reel specifications. Current inventory: 2400 units.
• AD8038ARZ-REEL7 (Tape & Reel format): Optimized for high-volume automated assembly operations. Current inventory: 7486 units, representing the highest available stock level.

Selection among these three variants should be based on production volume requirements and existing assembly equipment compatibility rather than electrical performance, as all three share identical electrical specifications.

Electrical Performance Enhancement:

The AD8038 series provides measurable improvements in key performance metrics: 10.4% higher slew rate (425 V/µs versus 385 V/µs), 59.1% greater bandwidth (350 MHz versus 220 MHz), and 97.8% reduction in supply current consumption (1 mA versus 23 mA). These enhancements support applications requiring higher signal fidelity and reduced power dissipation without requiring circuit redesign.

Frequently Asked Questions (FAQ)

Q1: Can the AD8038ARZ, AD8038ARZ-REEL, and AD8038ARZ-REEL7 be used interchangeably with the MAX4285ESA?

A: Yes. All three AD8038 variants are electrically and mechanically compatible with the MAX4285ESA. The differences among these three part numbers relate exclusively to packaging format (tube, standard reel, or tape & reel) and do not affect electrical performance or PCB compatibility. Selection should be based on production volume and assembly equipment specifications.

Q2: What is the primary reason for substituting the MAX4285ESA?

A: The MAX4285ESA is classified as obsolete, indicating discontinued manufacturing. Substitution with the active AD8038 series ensures long-term component availability, ongoing technical support, and compliance with current regulatory standards (ROHS3).

Q3: Are there any PCB layout modifications required when substituting the MAX4285ESA with AD8038 variants?

A: No. Both the MAX4285ESA and all AD8038 variants use the identical 8-SOIC (0.154", 3.90mm Width) surface mount package. Direct footprint compatibility is maintained without layout changes.

Q4: How do the electrical specifications of the AD8038 compare to the MAX4285ESA?

A: The AD8038 series provides superior performance across multiple parameters: higher slew rate (425 V/µs versus 385 V/µs), greater bandwidth (350 MHz versus 220 MHz), lower input bias current (400 nA versus 13 µA), and significantly reduced supply current (1 mA versus 23 mA). These improvements represent performance enhancements rather than incompatibilities.

Q5: What is the operating temperature range compatibility?

A: Both the MAX4285ESA and all AD8038 variants support the identical -40°C to 85°C operating temperature range, ensuring thermal envelope compatibility across all environmental conditions.

Q6: Are there supply voltage compatibility concerns?

A: The MAX4285ESA operates within a 2.85V to 6.5V supply range. The AD8038 series supports 3V to 12V, which encompasses the original specification. Applications operating at the minimum 2.85V threshold should verify AD8038 operation at 3V minimum, though this represents a marginal 0.15V increase.

Q7: Which AD8038 variant should be selected for high-volume production?

A: The AD8038ARZ-REEL7 (Tape & Reel format) is optimized for high-volume automated assembly and currently maintains the highest inventory level (7486 units), supporting extended production runs without supply interruption.

Q8: Do the substitute parts maintain the same regulatory and export classifications?

A: Yes. All AD8038 variants maintain identical REACH Unaffected status, EAR99 export classification, and HTSUS commodity code (8542.33.0001) as the original MAX4285ESA, ensuring consistent regulatory and customs documentation.

Q9: What is the moisture sensitivity level for the substitute parts?

A: All AD8038 variants maintain MSL 1 (Unlimited) classification, identical to the MAX4285ESA, indicating no moisture sensitivity restrictions during storage or handling.

Q10: Are there secondary substitute options beyond the AD8038 series?

A: The provided substitution data identifies the AD8038 series as the primary manufacturer-recommended equivalents. Secondary substitutes for the AD8038ARZ-REEL variant include OPA820ID, OPA690IDR, OPA890ID, OPA820IDG4, and OPA820IDR, though these represent alternatives to the AD8038 rather than direct MAX4285ESA substitutes.