MAX4126ESA-T Equivalent & Substitute Parts

Part Overview

The MAX4126ESA-T is a general purpose operational amplifier manufactured by Analog Devices Inc./Maxim Integrated, configured as a dual-channel (2 circuit) rail-to-rail amplifier in 8-SOIC surface mount packaging. This device is classified as obsolete, indicating discontinued production and limited availability through standard distribution channels. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support ongoing production requirements for applications utilizing this amplifier topology.

Key Parameters

Parameter	Value	Unit
Amplifier Type	General Purpose	—
Number of Circuits	2	—
Output Type	Rail-to-Rail	—
Slew Rate	2	V/µs
Gain Bandwidth Product	5	MHz
Current - Input Bias	50	nA
Voltage - Input Offset	250	µV
Current - Supply (x2 Channels)	725	µA
Current - Output / Channel	50	mA
Voltage - Supply Span (Min)	2.7	V
Voltage - Supply Span (Max)	6.5	V
Operating Temperature	-40 to 85	°C
Package / Case	8-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the MAX4126ESA-T are identified based on strict electrical and mechanical compatibility criteria. All substitute candidates must satisfy the following mandatory parameters:

Mechanical Compatibility:

Package type: 8-SOIC surface mount
Package dimensions: 0.154" width (3.90mm)
Mounting type: Surface mount

Electrical Compatibility:

Dual-channel configuration (2 circuits)
Rail-to-rail output capability
Supply voltage range: minimum 2.7V, maximum 6.5V (or compatible subset)
Operating temperature range: -40°C to 85°C (or extended range)

Regulatory Compliance:

RoHS3 compliant
MSL rating: 1 or equivalent
REACH unaffected status

Substitutes are grouped into two categories: direct packaging equivalents and functional alternatives with enhanced or modified electrical characteristics. Direct equivalents maintain identical or superior performance within the specified parameter envelope. Functional alternatives provide equivalent circuit functionality with different amplifier topologies (voltage feedback, CMOS) that may offer improved performance in specific applications while maintaining compatibility with the 8-SOIC footprint and dual-channel configuration.

Parameter Comparison

Part Number	Manufacturer	Product Status	Amplifier Type	Slew Rate (V/µs)	GBW (MHz)	Input Bias (nA)	Input Offset (µV)	Supply Current (µA)	Output Current (mA)	Supply Min (V)	Supply Max (V)	Temp Range (°C)	Packaging
MAX4126ESA-T	Analog Devices	Obsolete	General Purpose	2	5	50	250	725	50	2.7	6.5	-40 to 85	8-SOIC
MAX4126ESA+T	Analog Devices	Active	General Purpose	2	5	50	250	725	50	2.7	6.5	-40 to 85	Tape & Reel
AD8032ARZ-REEL7	Analog Devices	Active	Voltage Feedback	35	80	450	1000	900	15	2.7	12	-40 to 85	Cut Tape & Digi-Reel
AD8602ARZ	Analog Devices	Active	CMOS	6	8.4	0.002	80	750	50	2.7	5.5	-40 to 125	Tube
AD8602ARZ-REEL	Analog Devices	Active	CMOS	6	8.4	0.002	80	750	50	2.7	5.5	-40 to 125	Tape & Reel
AD8602ARZ-REEL7	Analog Devices	Active	CMOS	6	8.4	0.002	80	750	50	2.7	5.5	-40 to 125	Cut Tape & Digi-Reel
LMV358M/NOPB	Texas Instruments	Active	General Purpose	1	1	15	1700	210	160	2.7	5.5	-40 to 125	Tube
OPA2340UA	Texas Instruments	Active	CMOS	6	5.5	0.0002	150	750	50	2.5	5.5	-40 to 85	Tube
OPA2340UA/2K5	Texas Instruments	Active	CMOS	6	5.5	0.0002	150	750	50	2.5	5.5	-40 to 85	Cut Tape & Digi-Reel
OPA2350UA	Texas Instruments	Active	CMOS	22	38	0.0005	150	5200	40	2.7	5.5	-40 to 85	Tube
OPA2350UA/2K5	Texas Instruments	Active	CMOS	22	38	0.0005	150	5200	40	2.7	5.5	-40 to 85	Cut Tape & Digi-Reel

Engineering Selection Recommendations

Direct Equivalent (Recommended for Immediate Substitution):

MAX4126ESA+T is the primary substitute for MAX4126ESA-T. This part maintains identical electrical specifications across all critical parameters: 2V/µs slew rate, 5 MHz gain bandwidth product, 50 nA input bias current, 250 µV input offset voltage, and 725 µA supply current. The only difference is packaging format (Tape & Reel versus unspecified original packaging) and active product status. This part is currently in production with 2800 units in stock, ensuring supply continuity. Both parts are RoHS3 compliant with MSL 1 rating and identical temperature operating range (-40°C to 85°C).

Functional Alternatives (Analog Devices Family):

AD8602ARZ, AD8602ARZ-REEL, and AD8602ARZ-REEL7 are CMOS amplifiers offering superior performance characteristics while maintaining 8-SOIC packaging and dual-channel configuration. These parts provide 6V/µs slew rate (3× improvement), 8.4 MHz gain bandwidth product (1.68× improvement), and dramatically reduced input bias current (0.002 nA versus 50 nA). Supply voltage range is constrained to 2.7V–5.5V (versus 6.5V maximum on original), which is acceptable for most 3.3V and 5V rail applications. Extended operating temperature to 125°C provides additional margin. These parts are active with substantial inventory (7400–20100 units).

Functional Alternatives (Texas Instruments Family):

OPA2340UA and OPA2340UA/2K5 are microPOWER CMOS amplifiers with 6V/µs slew rate and 5.5 MHz gain bandwidth product, closely matching original performance envelope. Input bias current is 0.2 pA (negligible), and input offset voltage is 150 µV (40% improvement). Supply range is 2.5V–5.5V. Operating temperature matches original specification (-40°C to 85°C). These parts are active with 6762–40400 units in stock.

OPA2350UA and OPA2350UA/2K5 are MicroAmplifier devices offering significantly enhanced performance: 22V/µs slew rate (11× improvement) and 38 MHz gain bandwidth product (7.6× improvement). These represent premium alternatives for applications requiring higher bandwidth and faster transient response. Supply current increases to 5.2 mA (versus 725 µA), and output current decreases to 40 mA (versus 50 mA). Supply range is 2.7V–5.5V. These parts are active with 16535–30300 units in stock.

LMV358M/NOPB is a general purpose amplifier from Texas Instruments with lower performance specifications (1V/µs slew rate, 1 MHz gain bandwidth product) but superior output current capability (160 mA). This part is suitable only for applications where the original MAX4126ESA-T performance is excessive and lower bandwidth is acceptable. Supply range is 2.7V–5.5V with extended temperature range to 125°C.

Compliance and Regulatory Status:

All substitute parts are RoHS3 compliant and REACH unaffected, matching the regulatory posture of the original device. MSL ratings are 1 or 2, both acceptable for standard PCB assembly processes. All parts maintain 8-SOIC surface mount packaging with identical footprint dimensions (0.154" width, 3.90mm).

Frequently Asked Questions (FAQ)

Q: Can MAX4126ESA+T be used as a direct drop-in replacement for MAX4126ESA-T?

A: Yes. MAX4126ESA+T is electrically and functionally identical to MAX4126ESA-T across all specified parameters. The only difference is packaging format (Tape & Reel). Both parts have identical pinout, electrical performance, and thermal characteristics. The primary advantage of MAX4126ESA+T is active production status and current availability (2800 units in stock versus 723 units for the obsolete variant).

Q: What are the key differences between the Analog Devices AD8602 family and the original MAX4126ESA-T?

A: AD8602 devices use CMOS amplifier topology versus the general purpose topology of MAX4126ESA-T. Key improvements include 3× higher slew rate (6V/µs versus 2V/µs), 1.68× higher gain bandwidth product (8.4 MHz versus 5 MHz), and dramatically lower input bias current (0.002 nA versus 50 nA). The supply voltage maximum is reduced from 6.5V to 5.5V, which is acceptable for standard 3.3V and 5V applications. All AD8602 variants are available in 8-SOIC packaging with active production status.

Q: Are the Texas Instruments OPA2340 and OPA2350 families compatible with the MAX4126ESA-T footprint?

A: Yes. Both OPA2340 and OPA2350 families are packaged in 8-SOIC surface mount with identical pinout and footprint dimensions (0.154" width, 3.90mm). OPA2340 provides performance closely aligned with the original device (6V/µs slew rate, 5.5 MHz gain bandwidth product), while OPA2350 offers significantly enhanced performance (22V/µs slew rate, 38 MHz gain bandwidth product) for applications requiring higher bandwidth. Both families are available in multiple packaging formats (Tube, Cut Tape & Digi-Reel).

Q: What is the impact of supply voltage range differences on substitution?

A: The original MAX4126ESA-T operates from 2.7V to 6.5V. Most substitute parts operate from 2.7V to 5.5V, which covers standard 3.3V and 5V single-supply applications and ±2.75V dual-supply configurations. If your application requires operation above 5.5V (such as 12V single supply or ±6V dual supply), only AD8032ARZ-REEL7 supports the extended range (2.7V to 12V). Verify your actual supply voltage requirements before selecting a substitute.

Q: How do input bias current differences affect circuit design?

A: The original MAX4126ESA-T has 50 nA input bias current. CMOS alternatives (AD8602, OPA2340, OPA2350) have input bias currents in the picoampere range (0.0002 to 0.002 nA), which is negligible for most applications. This improvement reduces input offset errors caused by bias current flowing through source impedances, particularly beneficial in high-impedance signal conditioning circuits. General purpose alternatives (LMV358M/NOPB) have 15 nA bias current, which is lower than the original but higher than CMOS devices.

Q: What packaging options are available for each substitute?

A: MAX4126ESA+T is available in Tape & Reel format. AD8602 variants are available in Tube, Tape & Reel, and Cut Tape & Digi-Reel formats. OPA2340 and OPA2350 families are available in Tube and Cut Tape & Digi-Reel formats. LMV358M/NOPB is available in Tube format. Select packaging based on your procurement and assembly requirements: Tube for small quantities, Tape & Reel or Cut Tape & Digi-Reel for automated assembly.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed are RoHS3 compliant with MSL ratings of 1 or 2, matching the regulatory compliance of the original MAX4126ESA-T. All parts are REACH unaffected. No additional environmental or regulatory qualification is required for substitution.

Q: Which substitute offers the best performance-to-cost ratio for general purpose applications?

A: For applications where the original MAX4126ESA-T performance is adequate, MAX4126ESA+T provides identical specifications with active production status. For applications benefiting from improved performance, AD8602ARZ-REEL7 and OPA2340UA/2K5 offer significant improvements in slew rate and gain bandwidth product with comparable supply current and cost positioning. OPA2350UA/2K5 is recommended only for applications requiring high-speed transient response (22V/µs slew rate, 38 MHz bandwidth), as the increased supply current (5.2 mA) may impact power budget.

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