MAX4126EUA-T Equivalent & Substitute Parts

Part Overview

The MAX4126EUA-T is a general purpose operational amplifier manufactured by Analog Devices Inc./Maxim Integrated, configured as a dual-channel (2 circuit) rail-to-rail output device in an 8-uMAX/uSOP surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements.

The MAX4126EUA-T serves applications requiring low-power, general-purpose amplification with rail-to-rail output capability across supply voltages from 2.7 V to 6.5 V. The obsolete status necessitates identification of active alternative components that maintain functional compatibility within specified electrical and mechanical parameters.

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	400	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
Mounting Type	Surface Mount	—
Package / Case	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the MAX4126EUA-T is determined by the following critical parameters:

Primary Compatibility Criteria:

Dual-channel configuration (2 circuits)
Rail-to-rail output capability
Surface mount package compatibility (8-TSSOP/8-MSOP footprint)
Supply voltage range overlap with 2.7 V minimum and 6.5 V maximum
Operating temperature range of -40°C to 85°C minimum

Secondary Performance Criteria:

Slew rate ≥ 2 V/µs
Gain bandwidth product ≥ 5 MHz
Input bias current ≤ 50 nA
Input offset voltage ≤ 400 µV
Output current per channel ≥ 50 mA

Substitute parts are grouped into two categories:

Category 1: Direct Equivalents (Identical Specifications)

MAX4126EUA+T: Active product status, identical electrical specifications, tape & reel packaging

Category 2: Functional Substitutes (Compatible Parameters)

AD8032ARMZ-REEL7, AD8032ARMZ-REEL: Voltage feedback amplifiers with enhanced performance (35 V/µs slew rate, 80 MHz bandwidth) but higher supply current and reduced output current
MCP6482-E/MS, MCP6492-E/MS: General purpose amplifiers with superior input bias current (1 pA) and extended temperature range to 125°C, but reduced maximum supply voltage to 5.5 V
OPA2314AIDGK, OPA2314AIDGKR, OPA2340EA/250, OPA2340EA/2K5: CMOS amplifiers with ultra-low input bias current (0.2 pA) and extended temperature range, but reduced slew rate and gain bandwidth product
TLV2462CDGK: General purpose amplifier with higher output current (80 mA) but limited operating temperature range (0°C to 70°C)

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)	Package
MAX4126EUA-T	Analog Devices/Maxim	Obsolete	General Purpose	2	5	50	400	725	50	2.7	6.5	-40 to 85	8-uMAX/uSOP
MAX4126EUA+T	Analog Devices/Maxim	Active	General Purpose	2	5	50	400	725	50	2.7	6.5	-40 to 85	8-uMAX/uSOP
AD8032ARMZ-REEL7	Analog Devices	Active	Voltage Feedback	35	80	450	1000	900	15	2.7	12	-40 to 85	8-MSOP
MCP6492-E/MS	Microchip Technology	Active	General Purpose	6	7.5	0.001	1500	530	15	2.4	5.5	-40 to 125	8-MSOP
OPA2314AIDGKR	Texas Instruments	Active	CMOS	1.5	3	0.0002	500	150	20	1.8	5.5	-40 to 125	8-VSSOP
OPA2340EA/2K5	Texas Instruments	Active	CMOS	6	5.5	0.0002	150	750	50	2.5	5.5	-40 to 125	8-VSSOP
TLV2462CDGK	Texas Instruments	Active	General Purpose	1.6	6.4	1.3	500	550	80	2.7	6	0 to 70	8-VSSOP

Engineering Selection Recommendations

Direct Replacement (No Design Changes Required):

MAX4126EUA+T is the recommended direct replacement. This part maintains identical electrical specifications, dual-channel configuration, and package compatibility with the obsolete MAX4126EUA-T. The only difference is active product status and tape & reel packaging format. This substitution requires no circuit modifications or performance verification.

Functional Substitutes (Design Review Required):

Selection of functional substitutes depends on application-specific requirements and tolerance for parameter deviations:

For applications prioritizing supply voltage range and output current: OPA2340EA/2K5 provides the closest match to output current capability (50 mA) and maintains the 2.5 V to 5.5 V supply range. Extended operating temperature to 125°C and ROHS3 compliance are maintained. Trade-offs include reduced slew rate (6 V/µs vs. 2 V/µs) and lower gain bandwidth product (5.5 MHz vs. 5 MHz), which are acceptable for general-purpose applications not requiring high-frequency performance.

For applications requiring extended temperature operation: MCP6492-E/MS and OPA2314AIDGKR both extend operating temperature to 125°C. MCP6492-E/MS offers superior gain bandwidth product (7.5 MHz) and slew rate (6 V/µs) but reduces maximum supply voltage to 5.5 V and output current to 15 mA. OPA2314AIDGKR provides ultra-low input bias current (0.2 pA) suitable for high-impedance applications but with reduced slew rate (1.5 V/µs) and gain bandwidth product (3 MHz).

For applications requiring maximum output current: TLV2462CDGK provides 80 mA output current per channel, exceeding the original 50 mA specification. However, operating temperature range is limited to 0°C to 70°C, making this suitable only for commercial-grade applications. Slew rate is reduced to 1.6 V/µs.

For high-speed applications: AD8032ARMZ-REEL7 provides significantly enhanced performance with 35 V/µs slew rate and 80 MHz bandwidth. Supply voltage range extends to 12 V maximum. Trade-offs include increased supply current (900 µA vs. 725 µA) and reduced output current (15 mA vs. 50 mA). This substitution is appropriate only when high-frequency performance justifies the performance trade-offs.

All recommended substitutes maintain ROHS3 compliance and EAR99 export classification consistent with the original part.

Frequently Asked Questions (FAQ)

Q: Can MAX4126EUA+T be used as a direct replacement for MAX4126EUA-T?

A: Yes. MAX4126EUA+T is electrically and functionally identical to MAX4126EUA-T. The only differences are active product status and tape & reel packaging. No circuit modifications are required. This is the recommended replacement for obsolete inventory.

Q: What is the primary difference between the MAX4126 and AD8032 families?

A: The MAX4126 is a general-purpose amplifier optimized for low-power applications with 2 V/µs slew rate and 5 MHz gain bandwidth product. The AD8032 is a voltage feedback amplifier with significantly higher performance: 35 V/µs slew rate and 80 MHz bandwidth. The AD8032 is suitable for applications requiring higher frequency response but consumes more supply current and provides lower output current per channel.

Q: Are the OPA2314 and OPA2340 parts interchangeable?

A: No. While both are CMOS amplifiers in compatible packages, they have different performance characteristics. OPA2314AIDGKR has lower slew rate (1.5 V/µs) and gain bandwidth product (3 MHz) but ultra-low input bias current (0.2 pA). OPA2340EA/2K5 has higher slew rate (6 V/µs) and gain bandwidth product (5.5 MHz) with output current matching the original MAX4126 (50 mA). Selection depends on whether input bias current or output current is the limiting factor in the application.

Q: What is the impact of reduced maximum supply voltage in MCP6492-E/MS?

A: MCP6492-E/MS operates to 5.5 V maximum, compared to 6.5 V for MAX4126EUA-T. Applications using supply voltages between 5.5 V and 6.5 V cannot use this substitute without circuit redesign. For applications operating at 5.5 V or below, this part is compatible and offers superior gain bandwidth product (7.5 MHz) and extended temperature range to 125°C.

Q: Why does TLV2462CDGK have a limited operating temperature range?

A: TLV2462CDGK is specified for 0°C to 70°C commercial temperature range, compared to -40°C to 85°C for MAX4126EUA-T. This part is suitable only for applications not requiring extended temperature operation. Industrial and automotive applications requiring -40°C to 85°C operation must select alternative substitutes.

Q: Can I use AD8032ARMZ-REEL7 in a circuit designed for MAX4126EUA-T?

A: AD8032ARMZ-REEL7 can be used only if the application can tolerate reduced output current (15 mA vs. 50 mA) and increased supply current (900 µA vs. 725 µA). The significantly higher slew rate (35 V/µs) and bandwidth (80 MHz) may introduce stability issues in circuits designed for lower-bandwidth amplifiers. Circuit simulation and stability analysis are required before substitution.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed maintain ROHS3 compliance consistent with the original MAX4126EUA-T. Moisture sensitivity levels vary: MAX4126EUA+T and TLV2462CDGK are MSL 1 (Unlimited), while OPA2314 and OPA2340 variants are MSL 2 (1 Year). This affects storage and handling requirements.

Q: What package compatibility issues should I consider?

A: The original MAX4126EUA-T uses 8-uMAX/uSOP package. Direct equivalent MAX4126EUA+T uses the same package. Functional substitutes use 8-MSOP or 8-VSSOP packages, which have identical 0.118" (3.00mm) width and 8-pin configuration but may have different pin spacing and thermal characteristics. PCB layout verification is required before substitution of functional alternatives.

Q: Which substitute offers the best low-power performance?

A: OPA2314AIDGKR offers the lowest supply current at 150 µA (x2 channels), compared to 725 µA for MAX4126EUA-T. This represents an 79% reduction in power consumption. However, this comes with reduced slew rate (1.5 V/µs) and gain bandwidth product (3 MHz). For applications where power consumption is critical and high-frequency performance is not required, OPA2314AIDGKR is the optimal choice.

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