MAX473CSA+ Equivalent & Substitute Parts Reference

Part Overview

The MAX473CSA+ is a general-purpose operational amplifier manufactured by Analog Devices Inc./Maxim Integrated, designed for rail-to-rail applications in 8-SOIC surface mount packaging. This device is classified as obsolete, making equivalent substitutes necessary for new designs and ongoing production requirements. The MAX473CSA+ operates across a supply voltage range of 2.7V to 5.25V with a slew rate of 17V/µs and gain bandwidth product of 12 MHz, serving applications requiring single-circuit amplification with controlled input bias characteristics.

Substiute Parts

MAX473CSA+

Analog Devices Inc./Maxim IntegratedIn Stock: 1148MAX473CSA+ Datasheet

Current PartRFQ

MCP6021T-E/SN

Microchip TechnologyIn Stock: 3914MCP6021T-E/SN Datasheet

MFR RecommendedRFQ

MCP6291-E/SN

Microchip TechnologyIn Stock: 3120MCP6291-E/SN Datasheet

MFR RecommendedRFQ

MCP6291T-E/SN

Microchip TechnologyIn Stock: 1954MCP6291T-E/SN Datasheet

MFR RecommendedRFQ

MCP6L91T-E/SN

Microchip TechnologyIn Stock: 4412MCP6L91T-E/SN Datasheet

MFR RecommendedRFQ

TLV2621IDR

Texas InstrumentsIn Stock: 1134TLV2621IDR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MAX473CSA+ is determined by strict adherence to the following electrical and mechanical parameters:

Critical Matching Parameters:

• Package / Case: 8-SOIC (0.154", 3.90mm Width) — all substitutes must use identical surface mount package
• Amplifier Type: General Purpose — functional category must remain constant
• Number of Circuits: 1 — single-circuit configuration required
• Output Type: Rail-to-Rail — output swing capability must be maintained
• Mounting Type: Surface Mount — PCB assembly compatibility

Electrical Compatibility Parameters:

• Voltage - Supply Span: Substitute minimum must be ≤2.7V; substitute maximum must be ≥5.25V to ensure operation across the original supply range
• Current - Input Bias: Substitute value must not exceed original specification to maintain signal integrity
• Voltage - Input Offset: Substitute value must not exceed original specification for precision applications
• Slew Rate: Substitute value should meet or exceed 17V/µs for dynamic performance
• Gain Bandwidth Product: Substitute value should meet or exceed 12 MHz for frequency response

All identified substitutes meet the mandatory package, circuit count, and output type requirements. Electrical parameters vary within acceptable ranges for general-purpose amplifier applications.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Active Product Status):

The MCP6021T-E/SN, MCP6291-E/SN, MCP6291T-E/SN, and MCP6L91T-E/SN from Microchip Technology are all classified as Active products, ensuring long-term availability and manufacturing support. These devices provide superior input bias current performance (1 pA versus 80 nA) and extended operating temperature range (-40°C to 125°C versus 0°C to 70°C). All four devices maintain ROHS3 compliance and MSL 1 rating, matching the original part's environmental specifications.

Secondary Substitute (Last Time Buy Status):

The TLV2621IDR from Texas Instruments is classified as Last Time Buy, indicating limited future availability. This device offers the closest input offset voltage specification (250 µV) to the MAX473CSA+ and maintains ROHS3 compliance. Selection of this part should account for its end-of-life status.

Supply Voltage Compatibility:

All substitute parts operate within or exceed the original 2.7V to 5.25V supply range. MCP6291-E/SN, MCP6291T-E/SN, and MCP6L91T-E/SN extend the maximum supply voltage to 6V, providing additional design flexibility. TLV2621IDR and MCP6021T-E/SN maintain 5.5V maximum, which covers the original specification.

Current Consumption Consideration:

The MCP6L91T-E/SN offers the lowest supply current (850 µA) among active substitutes, followed by TLV2621IDR (800 µA). The original MAX473CSA+ draws 2 mA, making all substitutes more power-efficient for battery-powered or low-power applications.

Slew Rate and Bandwidth Trade-off:

The MAX473CSA+ specifies 17V/µs slew rate and 12 MHz gain bandwidth product. All substitute parts operate at 7V/µs slew rate with 10-11 MHz bandwidth. Applications requiring the original higher slew rate performance must evaluate circuit-level impact before substitution.

Frequently Asked Questions (FAQ)

Q1: Can I directly replace MAX473CSA+ with any of these substitute parts without PCB modifications?

All substitute parts use identical 8-SOIC (0.154", 3.90mm Width) surface mount packaging with the same pinout configuration. Direct PCB replacement is mechanically and electrically feasible. However, electrical parameter differences (slew rate, input offset voltage, input bias current) may affect circuit performance in precision or high-speed applications. Circuit validation is required for critical applications.

Q2: Which substitute offers the best performance match to the original MAX473CSA+?

The TLV2621IDR provides the closest input offset voltage specification (250 µV versus 700 µV) and maintains the original supply voltage range (2.7V to 5.5V). However, its Last Time Buy status limits long-term availability. For sustained production, MCP6021T-E/SN offers active product status with superior input bias current (1 pA) and acceptable input offset voltage (500 µV).

Q3: What is the impact of lower slew rate in substitute parts?

The MAX473CSA+ specifies 17V/µs slew rate, while all substitutes operate at 7V/µs. This 2.4× reduction affects applications with fast transient signals or high-frequency switching. For general-purpose amplification below 1 MHz, the slew rate difference is negligible. High-speed comparator or transimpedance amplifier applications require detailed circuit analysis.

Q4: Are all substitute parts RoHS3 compliant?

All identified substitute parts are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, matching the original MAX473CSA+ environmental specifications. This ensures compatibility with modern manufacturing processes and regulatory requirements.

Q5: Which substitute provides the widest operating temperature range?

All active substitute parts (MCP6021T-E/SN, MCP6291-E/SN, MCP6291T-E/SN, MCP6L91T-E/SN) and TLV2621IDR operate across -40°C to 125°C, compared to the original 0°C to 70°C range. This extended temperature capability supports industrial and automotive applications beyond the original specification.

Q6: What is the difference between MCP6291-E/SN and MCP6291T-E/SN?

Both parts are electrically identical with identical electrical specifications. The primary difference is packaging: MCP6291-E/SN is supplied in Tube packaging, while MCP6291T-E/SN is supplied in Tape & Reel (TR) format. Selection depends on assembly process requirements and inventory management preferences.

Q7: Why does MCP6L91T-E/SN have lower supply current than other substitutes?

The MCP6L91T-E/SN is optimized for low-power applications with 850 µA supply current versus 1 mA for other Microchip substitutes. This 15% reduction in quiescent current makes it suitable for battery-powered or energy-harvesting applications. All other electrical parameters remain equivalent to MCP6291T-E/SN.

Q8: Can I use these substitutes in designs originally specified for MAX473CSA+?

Direct substitution is feasible for general-purpose amplification applications. However, designs relying on specific MAX473CSA+ characteristics (17V/µs slew rate, 700 µV input offset voltage, 80 nA input bias current) require circuit-level evaluation. Input offset voltage and slew rate differences are most likely to affect precision instrumentation or high-frequency signal conditioning circuits.