MAX4431ESA-T Equivalent & Substitute Parts

Part Overview

The MAX4431ESA-T is a voltage feedback amplifier manufactured by Analog Devices Inc./Maxim Integrated, housed in an 8-SOIC surface mount package. This linear amplifier IC features a single circuit configuration with a slew rate of 145V/µs and -3dB bandwidth of 215 MHz. The device is classified as obsolete, making identification of suitable substitute components essential for ongoing design support and production continuity. Equivalent parts must maintain functional compatibility through matching package type, amplifier topology, and electrical performance within acceptable operating ranges.

Key Parameters

Parameter	MAX4431ESA-T
Manufacturer	Analog Devices Inc./Maxim Integrated
Category	Linear, Amplifiers
Amplifier Type	Voltage Feedback
Number of Circuits	1
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Slew Rate	145V/µs
-3dB Bandwidth	215 MHz
Current - Input Bias	11 µA
Voltage - Input Offset	1.25 mV
Current - Supply	11 mA
Current - Output / Channel	60 mA
Voltage - Supply Span (Min)	9 V
Voltage - Supply Span (Max)	11 V
Operating Temperature	-40°C ~ 85°C
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the MAX4431ESA-T requires matching the following critical parameters:

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

Amplifier Topology: The main part is a voltage feedback amplifier with a single circuit. Substitute parts are grouped by amplifier type: voltage feedback amplifiers (ADA4857-1YRZ, OPA656UB) maintain identical topology, while differential amplifiers (THS4503ID) and variable gain amplifiers (VCA810AID, VCA810AIDR) represent functional alternatives for specific application requirements.

Electrical Performance Range: Substitutes must operate within the supply voltage range of 4.5V to 15V to accommodate the original 9V to 11V specification. Slew rate, bandwidth, and output current capabilities determine suitability for signal processing applications.

Compliance & Status: All substitute parts are ROHS3 compliant. Active status parts (ADA4857-1YRZ, THS4503ID, VCA810AID, VCA810AIDR) provide long-term availability, while last-time-buy status (OPA656UB) indicates limited future procurement windows.

Parameter Comparison

Parameter	MAX4431ESA-T	ADA4857-1YRZ	OPA656UB	THS4503ID	VCA810AID	VCA810AIDR
Manufacturer	Analog Devices	Analog Devices	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Amplifier Type	Voltage Feedback	Voltage Feedback	Voltage Feedback	Differential	Variable Gain	Variable Gain
Number of Circuits	1	1	1	1	1	1
Package / Case	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Slew Rate	145 V/µs	2800 V/µs	295 V/µs	2800 V/µs	350 V/µs	350 V/µs
-3dB Bandwidth	215 MHz	850 MHz	500 MHz	370 MHz	35 MHz	35 MHz
Current - Input Bias	11 µA	2 µA	1 pA	4 µA	6 µA	6 µA
Voltage - Input Offset	1.25 mV	2 mV	250 µV	1 mV	100 µV	100 µV
Current - Supply	11 mA	5 mA	14 mA	23 mA	20 mA	20 mA
Current - Output / Channel	60 mA	50 mA	70 mA	120 mA	60 mA	60 mA
Voltage - Supply Span (Min)	9 V	4.5 V	8 V	4.5 V	8 V	8 V
Voltage - Supply Span (Max)	11 V	10.5 V	12 V	15 V	12 V	12 V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Product Status	Obsolete	Active	Last Time Buy	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL	1 (Unlimited)	1 (Unlimited)	3 (168 Hours)	1 (Unlimited)	2 (1 Year)	2 (1 Year)

Engineering Selection Recommendations

Direct Voltage Feedback Substitutes:

ADA4857-1YRZ and OPA656UB are voltage feedback amplifiers matching the MAX4431ESA-T topology. ADA4857-1YRZ offers active product status with extended temperature range (-40°C to 125°C), lower supply current (5 mA), and significantly higher bandwidth (850 MHz). OPA656UB provides last-time-buy status with comparable performance to the original part but higher output current capability (70 mA). Both maintain ROHS3 compliance and MSL ratings suitable for standard manufacturing processes.

Alternative Topologies:

THS4503ID is a differential amplifier with active status, offering higher output current (120 mA) and extended supply voltage range (4.5V to 15V). This part is suitable for applications requiring differential signal processing. VCA810AID and VCA810AIDR are variable gain amplifiers with active status, providing programmable gain control. These parts operate at lower bandwidth (35 MHz) and are appropriate for applications requiring gain adjustment.

Compliance Considerations:

All substitute parts maintain ROHS3 compliance. MSL ratings vary: ADA4857-1YRZ and THS4503ID offer unlimited moisture sensitivity (MSL 1), while OPA656UB requires controlled storage (MSL 3, 168 hours). VCA810AID and VCA810AIDR require one-year storage control (MSL 2). Selection should account for manufacturing environment and storage capabilities.

Availability & Long-Term Support:

ADA4857-1YRZ, THS4503ID, VCA810AID, and VCA810AIDR are active products with ongoing manufacturer support. OPA656UB is designated last-time-buy, indicating limited future availability. For new designs requiring long-term component availability, active-status parts are preferred.

Frequently Asked Questions (FAQ)

Q: Can ADA4857-1YRZ directly replace MAX4431ESA-T in existing designs?

A: ADA4857-1YRZ shares the same 8-SOIC package and voltage feedback topology. However, it exhibits significantly higher bandwidth (850 MHz vs. 215 MHz) and slew rate (2800 V/µs vs. 145 V/µs). Circuit performance will differ; designs must be re-evaluated for stability and frequency response. Supply current is lower (5 mA vs. 11 mA), reducing power consumption.

Q: What is the difference between VCA810AID and VCA810AIDR?

A: Both parts are functionally identical variable gain amplifiers with matching electrical specifications. VCA810AID is supplied in tube packaging, while VCA810AIDR uses tape-and-reel packaging. Selection depends on manufacturing process requirements and component handling equipment.

Q: Why is OPA656UB designated last-time-buy?

A: Last-time-buy status indicates the manufacturer has announced end-of-life for this product. Existing inventory is available, but future procurement is not guaranteed. For new designs, active-status alternatives (ADA4857-1YRZ, THS4503ID, VCA810AID, VCA810AIDR) are recommended.

Q: Are all substitute parts ROHS3 compliant?

A: Yes, all listed substitute parts are ROHS3 compliant, matching the environmental compliance of the original MAX4431ESA-T.

Q: What does MSL rating mean for component selection?

A: Moisture Sensitivity Level (MSL) indicates storage and handling requirements. MSL 1 (unlimited) parts require no special moisture control. MSL 2 (1 year) and MSL 3 (168 hours) parts require controlled storage environments and must be baked before reflow soldering if storage limits are exceeded. Manufacturing facilities must have appropriate storage capabilities for MSL 2 and MSL 3 parts.

Q: Can THS4503ID replace MAX4431ESA-T in voltage feedback applications?

A: THS4503ID is a differential amplifier, not a voltage feedback amplifier. While both are 8-SOIC linear amplifiers, the differential topology requires different circuit design and biasing. Direct substitution is not appropriate for voltage feedback applications.

Q: What supply voltage range should be used for substitute parts?

A: The original MAX4431ESA-T operates at 9V to 11V. Substitute parts support broader ranges: ADA4857-1YRZ (4.5V to 10.5V), OPA656UB (8V to 12V), THS4503ID (4.5V to 15V), and VCA810 variants (8V to 12V). Designs must operate within the intersection of the original specification and substitute part ratings to ensure compatibility.

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