MAX4400AXK-T Equivalent & Substitute Parts

Part Overview

The MAX4400AXK-T is a general purpose operational amplifier manufactured by Analog Devices Inc./Maxim Integrated, featuring rail-to-rail output capability in a 5-pin SC-70 surface mount package. This device is classified as obsolete, which necessitates identification of functionally equivalent alternatives for new designs and ongoing production requirements. The MAX4400AXK-T operates across a 2.5V to 5.5V supply range with a 1V/µs slew rate and 800 kHz gain bandwidth product, making it suitable for low-speed signal conditioning and general amplification applications.

Key Parameters

Parameter	Value	Unit
Amplifier Type	General Purpose	—
Number of Circuits	1	—
Output Type	Rail-to-Rail	—
Slew Rate	1	V/µs
Gain Bandwidth Product	800	kHz
Current - Input Bias	0.1	pA
Voltage - Input Offset	800	µV
Current - Supply	410	µA
Current - Output / Channel	30	mA
Voltage - Supply Span (Min)	2.5	V
Voltage - Supply Span (Max)	5.5	V
Operating Temperature	-40 to 125	°C
Package / Case	5-TSSOP, SC-70-5, SOT-353	—
Mounting Type	Surface Mount	—
RoHS Status	RoHS non-compliant	—
Product Status	Obsolete	—

Substitute Part Grouping Explanation

Substitution of the MAX4400AXK-T is determined by the following critical parameters: amplifier type (general purpose), single circuit configuration, rail-to-rail output capability, surface mount packaging, and supply voltage range compatibility (2.5V to 5.5V minimum). The obsolete status of the MAX4400AXK-T requires replacement with active product alternatives.

Substitute parts are grouped into two categories:

Category 1: Direct Form Factor Match (SC-70-5 Package) Parts maintaining identical 5-pin SC-70-5 package geometry: MAX4400AXK+T, LMV721IDCKR, LMV721IDCKT, LMV721M7/NOPB, and LMV721M7X/NOPB. These substitutes preserve PCB layout compatibility and require no redesign.

Category 2: Functional Equivalents (Alternative Packages) Parts providing general purpose amplification with rail-to-rail output in alternative surface mount packages: LMP2021MF/NOPB, LMP2021MFX/NOPB (SOT-23-5), LMV721IDBVR (SOT-23-5), LMV821M5/NOPB, and LMV821M5X/NOPB (SOT-23-5). These require PCB layout modification but offer enhanced performance characteristics.

Parameter Comparison

Part Number	Manufacturer	Amplifier Type	Output Type	Slew Rate (V/µs)	GBW (MHz)	Input Bias (pA)	Input Offset (µV)	Supply Current (mA)	Output Current (mA)	Supply Min (V)	Supply Max (V)	Temp Range (°C)	Package	Status	RoHS
MAX4400AXK-T	Analog Devices	General Purpose	Rail-to-Rail	1	0.8	0.1	800	0.41	30	2.5	5.5	-40 to 125	SC-70-5	Obsolete	Non-compliant
MAX4400AXK+T	Analog Devices	General Purpose	Rail-to-Rail	1	0.8	0.1	800	0.41	—	2.5	5.5	-40 to 125	SC-70-5	Active	ROHS3
LMP2021MF/NOPB	Texas Instruments	Zero-Drift	—	2.6	5	25	0.4	1.1	50	2.2	5.5	-40 to 125	SOT-23-5	Active	ROHS3
LMP2021MFX/NOPB	Texas Instruments	Zero-Drift	—	2.6	5	25	0.4	1.1	50	2.2	5.5	-40 to 125	SOT-23-5	Active	ROHS3
LMV721IDBVR	Texas Instruments	General Purpose	Rail-to-Rail	5.25	10	260	80	1.03	—	2.2	5	-40 to 105	SOT-23-5	Active	ROHS3
LMV721IDCKR	Texas Instruments	General Purpose	Rail-to-Rail	5.25	10	260	80	1.03	—	2.2	5	-40 to 105	SC-70-5	Active	ROHS3
LMV721IDCKT	Texas Instruments	General Purpose	Rail-to-Rail	5.25	10	260	80	1.03	—	2.2	5	-40 to 85	SC-70-5	Active	ROHS3
LMV721M7/NOPB	National Semiconductor	General Purpose	Rail-to-Rail	5.25	10	260	80	1.03	—	2.2	5.5	-40 to 85	SC-70-5	Active	—
LMV721M7X/NOPB	Texas Instruments	General Purpose	Rail-to-Rail	5.25	10	260	80	1.03	—	2.2	5.5	-40 to 85	SC-70-5	Active	ROHS3
LMV821M5/NOPB	National Semiconductor	General Purpose	Rail-to-Rail	2	5.6	100	3500	0.3	45	2.5	5.5	-40 to 85	SOT-23-5	Active	—
LMV821M5X/NOPB	National Semiconductor	General Purpose	Rail-to-Rail	2	5.6	100	3500	0.3	—	2.5	5.5	-40 to 85	SOT-23-5	Active	—

Engineering Selection Recommendations

Primary Recommendation: MAX4400AXK+T The MAX4400AXK+T is the direct active equivalent of the obsolete MAX4400AXK-T, manufactured by Analog Devices Inc./Maxim Integrated. This part maintains identical electrical specifications, package geometry (SC-70-5), and pinout. The MAX4400AXK+T is active product status with ROHS3 compliance, enabling seamless substitution without circuit redesign or PCB layout modification. This option is preferred for applications requiring form-factor compatibility and minimal qualification effort.

Secondary Recommendation: LMV721IDCKR or LMV721IDCKT The LMV721 series from Texas Instruments provides SC-70-5 package compatibility with enhanced performance characteristics: 5.25V/µs slew rate (5.25× improvement), 10 MHz gain bandwidth product (12.5× improvement), and superior input offset voltage (80 µV versus 800 µV). Both variants maintain rail-to-rail output and general purpose amplifier classification. LMV721IDCKR supports -40°C to 105°C temperature range; LMV721IDCKT supports -40°C to 85°C. Both are active product with ROHS3 compliance. These substitutes require no PCB layout changes and offer performance headroom for signal conditioning applications.

Tertiary Recommendation: LMV721M7X/NOPB The LMV721M7X/NOPB from Texas Instruments maintains SC-70-5 package compatibility with extended supply voltage range (2.2V to 5.5V) and active product status with ROHS3 compliance. Performance specifications match LMV721IDCKR/IDCKT variants. This part is suitable for applications requiring maximum supply voltage flexibility.

Alternative for Package Redesign: LMV721IDBVR For applications permitting PCB layout modification, the LMV721IDBVR offers SOT-23-5 package with identical LMV721 performance specifications. This package provides smaller footprint and is widely available (35,300 units in stock).

Zero-Drift Alternative: LMP2021MF/NOPB or LMP2021MFX/NOPB The LMP2021 series from Texas Instruments provides zero-drift amplifier technology with superior input offset voltage (0.4 µV versus 800 µV) and higher gain bandwidth product (5 MHz). These parts require SOT-23-5 package redesign and are classified as zero-drift amplifiers rather than general purpose. Selection is appropriate for applications requiring ultra-low offset voltage performance.

Frequently Asked Questions (FAQ)

Q: Can MAX4400AXK+T be used as a direct replacement for MAX4400AXK-T? A: Yes. The MAX4400AXK+T is the active equivalent of the obsolete MAX4400AXK-T with identical electrical specifications, pinout, and SC-70-5 package. No circuit modifications or PCB redesign are required. The primary difference is product status (active versus obsolete) and RoHS compliance (ROHS3 versus non-compliant).

Q: What are the key differences between MAX4400AXK-T and LMV721 series substitutes? A: The LMV721 series offers significantly improved performance: 5.25V/µs slew rate (versus 1V/µs), 10 MHz gain bandwidth product (versus 800 kHz), and 80 µV input offset voltage (versus 800 µV). Both maintain rail-to-rail output and SC-70-5 package compatibility. The LMV721 series is suitable for applications requiring higher bandwidth and faster signal response.

Q: Are LMV721IDCKR and LMV721IDCKT interchangeable? A: Both parts are electrically identical with identical specifications. The primary difference is operating temperature range: LMV721IDCKR supports -40°C to 105°C; LMV721IDCKT supports -40°C to 85°C. Selection depends on application temperature requirements.

Q: Can I use LMV721IDBVR instead of SC-70-5 package parts? A: LMV721IDBVR provides identical electrical performance but requires PCB layout modification due to SOT-23-5 package geometry. This substitution is appropriate only when PCB redesign is feasible and smaller footprint is beneficial.

Q: What is the difference between LMP2021 and LMV721 substitutes? A: LMP2021 is classified as zero-drift amplifier with 0.4 µV input offset voltage and 5 MHz gain bandwidth product. LMV721 is general purpose amplifier with 80 µV input offset voltage and 10 MHz gain bandwidth product. LMP2021 is appropriate for precision applications requiring ultra-low offset voltage; LMV721 is suitable for general signal conditioning with higher bandwidth.

Q: Are LMV821M5/NOPB and LMV821M5X/NOPB equivalent? A: Yes. Both parts are electrically identical with 5.6 MHz gain bandwidth product, 2V/µs slew rate, and SOT-23-5 package. These parts offer lower bandwidth than LMV721 series but maintain rail-to-rail output and general purpose amplifier classification.

Q: What is the supply voltage compatibility range for substitutes? A: MAX4400AXK-T operates 2.5V to 5.5V. LMV721 series operates 2.2V to 5V. LMV721M7/NOPB and LMV721M7X/NOPB operate 2.2V to 5.5V. LMP2021 series operates 2.2V to 5.5V. LMV821 series operates 2.5V to 5.5V. Verify application supply voltage requirements against substitute specifications.

Q: Which substitute offers the best inventory availability? A: LMV721IDBVR has highest inventory (35,300 units). LMV821M5X/NOPB has 20,200 units. LMV721IDCKR has 25,990 units. MAX4400AXK+T has 6,733 units. Inventory levels should be verified with suppliers for current availability.

Q: Are all recommended substitutes RoHS compliant? A: MAX4400AXK+T, LMP2021MF/NOPB, LMP2021MFX/NOPB, LMV721IDBVR, LMV721IDCKR, LMV721IDCKT, and LMV721M7X/NOPB are ROHS3 compliant. LMV721M7/NOPB, LMV821M5/NOPB, and LMV821M5X/NOPB do not list RoHS status in provided specifications. Verify RoHS compliance requirements for your application.

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