MAX4128ESA Equivalent & Substitute Parts

Part Overview

The MAX4128ESA is a general purpose operational amplifier featuring dual circuits in an 8-SOIC surface mount package, manufactured by Analog Devices Inc./Maxim Integrated. This device delivers rail-to-rail output capability with a 25 MHz gain bandwidth product and operates across a 2.7 V to 6.5 V supply range. The MAX4128ESA is classified as obsolete, necessitating identification of equivalent and substitute components for ongoing design support and production continuity. Substitute parts must maintain functional compatibility while meeting current manufacturing and compliance standards.

Key Parameters

Parameter	Value	Unit
Amplifier Type	General Purpose	—
Number of Circuits	2	—
Output Type	Rail-to-Rail	—
Slew Rate	10	V/µs
Gain Bandwidth Product	25	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	RoHS non-compliant	—

Substitute Part Grouping Explanation

Substitution of the MAX4128ESA requires matching across three critical parameter categories: electrical performance, physical packaging, and regulatory compliance.

Electrical Performance Criteria: Substitute parts must maintain dual-circuit configuration with rail-to-rail output capability. The slew rate (10 V/µs), gain bandwidth product (25 MHz), input bias current (50 nA), and input offset voltage (250 µV) define the performance envelope. Supply voltage range compatibility (minimum 2.7 V, maximum 6.5 V) is mandatory for direct substitution in existing designs.

Physical Packaging Criteria: All substitute parts must use the 8-SOIC surface mount package with 0.154" (3.90 mm) width to ensure PCB footprint compatibility without layout modifications.

Regulatory & Compliance Criteria: The MAX4128ESA is RoHS non-compliant and obsolete. Substitute parts are grouped by product status (Active vs. Last Time Buy) and RoHS compliance level (ROHS3 Compliant). Packaging variants (Tube, Cut Tape with Digi-Reel) affect supply chain availability and handling requirements.

Substitution Groups:

Group 1 – Direct Packaging Variant (Identical Electrical Specifications): MAX4128ESA+ maintains 100% electrical equivalence with improved RoHS3 compliance and Active product status.

Group 2 – Enhanced Performance Alternatives (Voltage Feedback Architecture): AD8032ARZ, AD8032ARZ-REEL, and AD8032ARZ-REEL7 offer higher slew rate (35 V/µs) and extended supply range (up to 12 V) with voltage feedback topology. These are suitable where performance headroom is acceptable.

Group 3 – Low-Power CMOS Alternative (Optimized for Low Supply Current): AD8656ARZ, AD8656ARZ-REEL, and AD8656ARZ-REEL7 provide CMOS architecture with significantly reduced supply current (3.7 mA vs. 725 µA) and extended temperature range (-40°C to 125°C), suitable for power-constrained applications.

Group 4 – Legacy General Purpose Alternative (Reduced Performance): LMV358M and LMV358M/NOPB, LMV358MX/NOPB offer general purpose amplification with lower bandwidth (1 MHz) and slew rate (1 V/µs), applicable only where performance requirements are less stringent.

Parameter Comparison

Part Number	Manufacturer	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	Product Status	RoHS
MAX4128ESA	Analog Devices/Maxim	General Purpose	10	25	50	250	725	50	2.7	6.5	-40 to 85	8-SOIC	Obsolete	Non-compliant
MAX4128ESA+	Analog Devices/Maxim	General Purpose	10	25	50	250	725	50	2.7	6.5	-40 to 85	8-SOIC	Active	ROHS3
AD8032ARZ	Analog Devices	Voltage Feedback	35	80	450	1000	900	15	2.7	12	-40 to 85	8-SOIC	Active	ROHS3
AD8032ARZ-REEL	Analog Devices	Voltage Feedback	35	80	450	1000	900	15	2.7	12	-40 to 85	8-SOIC	Active	ROHS3
AD8032ARZ-REEL7	Analog Devices	Voltage Feedback	35	80	450	1000	900	15	2.7	12	-40 to 85	8-SOIC	Active	ROHS3
AD8656ARZ	Analog Devices	CMOS	11	28	0.001	50	3.7	220	2.7	5.5	-40 to 125	8-SOIC	Active	ROHS3
AD8656ARZ-REEL	Analog Devices	CMOS	11	28	0.001	50	3.7	220	2.7	5.5	-40 to 125	8-SOIC	Active	ROHS3
AD8656ARZ-REEL7	Analog Devices	CMOS	11	28	0.001	50	3.7	220	2.7	5.5	-40 to 125	8-SOIC	Active	ROHS3
LMV358M	Texas Instruments	General Purpose	1	1	15	1700	210	160	2.7	5.5	-40 to 125	8-SOIC	Last Time Buy	ROHS3
LMV358M/NOPB	Texas Instruments	General Purpose	1	1	15	1700	210	160	2.7	5.5	-40 to 125	8-SOIC	Active	ROHS3
LMV358MX/NOPB	Texas Instruments	General Purpose	1	1	15	1700	210	160	2.7	5.5	-40 to 125	8-SOIC	Active	ROHS3

Engineering Selection Recommendations

Tier 1 – Recommended Direct Replacement:

MAX4128ESA+ is the primary substitute, providing identical electrical specifications with Active product status and ROHS3 compliance. This part eliminates obsolescence risk while maintaining 100% design compatibility. Inventory availability (12,700 pcs) supports production continuity.

Tier 2 – Performance-Enhanced Alternatives:

AD8032ARZ, AD8032ARZ-REEL, and AD8032ARZ-REEL7 are suitable where circuit design permits higher performance margins. The voltage feedback architecture delivers 35 V/µs slew rate and 80 MHz bandwidth, exceeding MAX4128ESA specifications. Extended supply range (up to 12 V) provides additional design flexibility. Output current is reduced to 15 mA per channel; verify load requirements before selection. These parts are Active with ROHS3 compliance and high inventory availability (12,665 to 100,516 pcs depending on packaging).

Tier 3 – Low-Power Optimization:

AD8656ARZ, AD8656ARZ-REEL, and AD8656ARZ-REEL7 address power-constrained applications with 3.7 mA supply current (5.1× lower than MAX4128ESA). CMOS architecture provides 1 pA input bias current and 50 µV input offset voltage. Extended temperature range (-40°C to 125°C) supports wider operating environments. Supply voltage maximum is limited to 5.5 V; verify compatibility with 6.5 V designs. Output current capability is 220 mA per channel. All variants are Active with ROHS3 compliance.

Tier 4 – Legacy General Purpose Option:

LMV358M/NOPB and LMV358MX/NOPB are applicable only where reduced bandwidth (1 MHz) and slew rate (1 V/µs) are acceptable. These parts offer lowest supply current (210 µA) and extended temperature range (-40°C to 125°C). LMV358M is Last Time Buy status; LMV358M/NOPB and LMV358MX/NOPB are Active. All are ROHS3 compliant. Use only in legacy designs or where performance requirements are significantly relaxed.

Compliance & Supply Chain Considerations:

All recommended substitutes are ROHS3 compliant, addressing regulatory requirements for new designs. Packaging variants (Tube, Cut Tape with Digi-Reel) affect procurement and assembly workflows. Cut Tape variants (REEL, REEL7 designations) provide higher inventory levels and are suitable for high-volume production. Tube packaging is appropriate for lower-volume or prototype applications.

Frequently Asked Questions (FAQ)

Q1: Can MAX4128ESA+ be used as a direct drop-in replacement for MAX4128ESA?

A: Yes. MAX4128ESA+ maintains identical electrical specifications, package footprint, and pinout. The primary differences are Active product status and ROHS3 compliance. No circuit modifications are required.

Q2: What are the key differences between MAX4128ESA and AD8032ARZ?

A: AD8032ARZ uses voltage feedback architecture versus general purpose topology. Slew rate increases from 10 V/µs to 35 V/µs, and bandwidth increases from 25 MHz to 80 MHz. Supply range extends to 12 V maximum. Input bias current increases from 50 nA to 450 nA, and output current per channel decreases from 50 mA to 15 mA. Verify load requirements and input impedance specifications before substitution.

Q3: Is AD8656ARZ suitable for designs requiring 6.5 V supply operation?

A: No. AD8656ARZ maximum supply voltage is 5.5 V. Designs operating at 6.5 V must use MAX4128ESA+, AD8032ARZ variants, or LMV358 series. Exceeding rated supply voltage will damage the device.

Q4: What is the significance of packaging variants (Tube, REEL, REEL7)?

A: Tube packaging contains components in individual tubes for manual handling and low-volume assembly. Cut Tape (CT) with Digi-Reel packaging provides components on continuous tape for automated pick-and-place equipment. REEL7 designation indicates 7-inch reel format. Selection depends on assembly process capability and production volume. All variants are electrically identical.

Q5: Can LMV358MX/NOPB replace MAX4128ESA in high-frequency applications?

A: No. LMV358MX/NOPB has 1 MHz bandwidth and 1 V/µs slew rate, significantly lower than MAX4128ESA (25 MHz, 10 V/µs). This part is suitable only for low-frequency applications such as audio, sensor conditioning, or DC amplification. High-frequency designs require AD8032ARZ or AD8656ARZ variants.

Q6: What is the impact of input bias current differences on circuit design?

A: MAX4128ESA specifies 50 nA input bias current. AD8032ARZ increases this to 450 nA, while AD8656ARZ reduces it to 1 pA. Higher bias current requires lower source impedance and may necessitate input bias current compensation networks. Lower bias current (AD8656ARZ) permits higher source impedance without offset errors. Review input stage design and feedback network impedance when substituting.

Q7: Are all substitute parts RoHS compliant?

A: All recommended substitutes are ROHS3 compliant. MAX4128ESA is RoHS non-compliant. For new designs or products subject to RoHS regulations, use MAX4128ESA+ or other ROHS3-compliant alternatives.

Q8: Which substitute offers the best inventory availability?

A: LMV358MX/NOPB (155,100 pcs) and AD8032ARZ-REEL (100,516 pcs) provide highest inventory levels. For Analog Devices-only sourcing, AD8032ARZ-REEL (100,516 pcs) is optimal. MAX4128ESA+ (12,700 pcs) provides direct equivalence with adequate supply.

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