LMV344MAX CMOS Amplifier Equivalent & Substitute Parts

Part Overview

The LMV344MAX is a CMOS operational amplifier IC featuring four independent circuits in a 14-SOIC surface mount package. This device is classified as Obsolete by Texas Instruments, with a rail-to-rail output configuration suitable for low-voltage applications spanning 2.7V to 5.5V supply voltage range. Due to its obsolete status and limited availability of the original part number, equivalent and substitute components are necessary for ongoing design support, production continuity, and system maintenance.

Key Parameters

Parameter	Value	Unit
Amplifier Type	CMOS	—
Number of Circuits	4	—
Output Type	Rail-to-Rail	—
Slew Rate	1	V/µs
Gain Bandwidth Product	1	MHz
Current - Input Bias	0.02	pA
Voltage - Input Offset	700	µV
Current - Supply (x4 Channels)	107	µA
Current - Output / Channel	113	mA
Voltage - Supply Span (Min)	2.7	V
Voltage - Supply Span (Max)	5.5	V
Operating Temperature	-40 to 125	°C
Package / Case	14-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—
RoHS Status	RoHS non-compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the LMV344MAX is determined by the following critical parameters:

Primary Substitution Criteria:

Number of Circuits: 4 independent amplifier channels
Package Type: 14-SOIC surface mount configuration
Output Configuration: Rail-to-rail output capability
Supply Voltage Range: Minimum 2.7V, Maximum 5.5V
Operating Temperature Range: -40°C to 125°C
Amplifier Type: CMOS technology

Secondary Compatibility Parameters:

Slew Rate: 1 V/µs (baseline performance metric)
Gain Bandwidth Product: 1 MHz (frequency response characteristic)
Input Bias Current: 0.02 pA (ultra-low input current)
Output Current per Channel: 113 mA (drive capability)

Substitute parts are grouped into two categories:

Category 1 - Direct Equivalents (Identical Electrical Performance): Parts that maintain all primary and secondary parameters within the specified ranges, ensuring pin-for-pin compatibility and functional interchangeability without circuit redesign.

Category 2 - Functional Substitutes (Enhanced or Modified Performance): Parts that satisfy all primary substitution criteria but may exceed baseline performance specifications in slew rate, gain bandwidth product, or other parameters. These parts are electrically compatible but may require verification of circuit behavior due to improved performance characteristics.

Parameter Comparison

Part Number	Manufacturer	Amplifier Type	Slew Rate (V/µs)	GBW (MHz)	Input Bias (pA)	Input Offset (µV)	Supply Current (µA)	Output Current (mA)	Voltage Supply Min (V)	Voltage Supply Max (V)	Temp Range (°C)	Package	RoHS Status	Product Status
LMV344MAX	Texas Instruments	CMOS	1	1	0.02	700	107	113	2.7	5.5	-40 to 125	14-SOIC	Non-compliant	Obsolete
LMV344MAX/NOPB	Texas Instruments	CMOS	1	1	0.02	700	107	113	2.7	5.5	-40 to 125	14-SOIC	ROHS3 Compliant	Active
ADA4891-4ARZ	Analog Devices Inc.	CMOS	210	105	2	2500	4.4	125	2.7	5.5	-40 to 125	14-SOIC	ROHS3 Compliant	Active
ADA4891-4ARZ-R7	Analog Devices Inc.	CMOS	210	105	2	2500	4.4	125	2.7	5.5	-40 to 125	14-SOIC	ROHS3 Compliant	Active
ADA4891-4ARZ-RL	Analog Devices Inc.	CMOS	210	105	2	2500	4.4	125	2.7	5.5	-40 to 125	14-SOIC	ROHS3 Compliant	Active
BU7487F-E2	Rohm Semiconductor	CMOS	10	10	1	1000	6	12	3	5.5	-40 to 105	14-SOP	ROHS3 Compliant	Active
LMR934F-GE2	Rohm Semiconductor	General Purpose	0.35	1.4	5000	1000	250	90	1.8	5	-40 to 85	14-SOP	ROHS3 Compliant	Active
LMV324BG-13	Diodes Incorporated	General Purpose	1	1	15000	1700	340	90	2.7	5.5	-40 to 125	14-SO	ROHS3 Compliant	Active
LMV324DR2G	onsemi	Voltage Feedback	1	1	1	1700	100	160	2.7	5.5	-40 to 85	14-SOIC	ROHS3 Compliant	Active
LMV824DR2G	onsemi	General Purpose	2	5.6	119000	1000	1000	45	2.7	5.5	-40 to 85	14-SOIC	ROHS3 Compliant	Active
MCP6244-E/SL	Microchip Technology	General Purpose	0.3	0.55	1	5000	50	23	1.8	5.5	-40 to 125	14-SOIC	ROHS3 Compliant	Active

Engineering Selection Recommendations

For Direct Replacement (No Circuit Redesign Required):

LMV344MAX/NOPB is the primary direct equivalent. This part maintains identical electrical specifications to the original LMV344MAX while offering Active product status and ROHS3 compliance. The only difference is packaging format (Tape & Reel versus bulk), making it suitable for production environments requiring RoHS-compliant components.

For Enhanced Performance Applications:

The ADA4891-4ARZ series (available in three packaging options: ADA4891-4ARZ, ADA4891-4ARZ-R7, and ADA4891-4ARZ-RL) provides significantly improved performance characteristics while maintaining the same 14-SOIC package footprint and supply voltage range. These parts feature 210 V/µs slew rate and 105 MHz gain bandwidth product, representing 210× and 105× improvements respectively over the LMV344MAX baseline. All variants are ROHS3 compliant and Active status. Selection among the three variants depends on packaging requirements: Tube (standard), Cut Tape & Digi-Reel (ADA4891-4ARZ-R7), or Tape & Reel (ADA4891-4ARZ-RL).

For Cost-Optimized Substitution:

LMV324DR2G (onsemi) offers a voltage feedback amplifier configuration with identical slew rate and gain bandwidth product to the LMV344MAX, maintaining the 14-SOIC package. This part provides lower supply current (100 µA versus 107 µA) and higher output current capability (160 mA versus 113 mA). Operating temperature range is -40°C to 85°C, which is acceptable for most applications within the -40°C to 125°C specification if operation above 85°C is not required.

For Low-Power Applications:

MCP6244-E/SL (Microchip Technology) is suitable when ultra-low supply current is critical. This part operates at 50 µA supply current (47% reduction from LMV344MAX) and supports extended supply voltage range (1.8V to 5.5V). Trade-offs include reduced slew rate (0.3 V/µs) and lower gain bandwidth product (550 kHz), making it appropriate for applications where bandwidth requirements are modest.

Compliance Considerations:

All recommended substitute parts carry ROHS3 compliance certification, addressing regulatory requirements for new designs. The original LMV344MAX is RoHS non-compliant; therefore, LMV344MAX/NOPB or any alternative listed above is required for applications subject to RoHS regulations.

Frequently Asked Questions (FAQ)

Q1: Can LMV344MAX/NOPB be used as a direct drop-in replacement for LMV344MAX?

A: Yes. LMV344MAX/NOPB is electrically and mechanically identical to LMV344MAX. Both parts feature the same 14-SOIC package, identical electrical specifications (1 V/µs slew rate, 1 MHz gain bandwidth product, 0.02 pA input bias current), and identical supply voltage range (2.7V to 5.5V). The primary difference is packaging format (Tape & Reel versus bulk) and RoHS compliance status. No circuit modifications are required.

Q2: What are the key differences between LMV344MAX and ADA4891-4ARZ?

A: Both parts are CMOS four-channel amplifiers in 14-SOIC packages with identical supply voltage ranges (2.7V to 5.5V) and operating temperature ranges (-40°C to 125°C). The ADA4891-4ARZ provides enhanced performance: slew rate of 210 V/µs (versus 1 V/µs), gain bandwidth product of 105 MHz (versus 1 MHz), and lower supply current of 4.4 mA (versus 107 µA). Input bias current is higher at 2 pA versus 0.02 pA. These improvements make ADA4891-4ARZ suitable for higher-frequency applications but may introduce different circuit behavior in sensitive analog designs.

Q3: Are there packaging differences between substitute parts?

A: Yes. Most substitute parts use 14-SOIC (0.154", 3.90mm width) packages identical to LMV344MAX. However, BU7487F-E2 and LMR934F-GE2 use 14-SOP packages with slightly different dimensions (0.173", 4.40mm width). While both are surface mount packages with 14 pins, PCB layout modifications may be required. LMV324BG-13 uses 14-SO package. Verify PCB footprint compatibility before substitution.

Q4: Which substitute part is recommended for battery-powered applications?

A: MCP6244-E/SL offers the lowest supply current at 50 µA per channel, making it optimal for battery-powered designs. This represents a 47% reduction in supply current compared to LMV344MAX. The trade-off is reduced slew rate (0.3 V/µs) and lower gain bandwidth product (550 kHz). This part is suitable for applications where bandwidth requirements are below 550 kHz and power consumption is critical.

Q5: Can LMV324DR2G replace LMV344MAX in all applications?

A: LMV324DR2G is compatible for most applications within the -40°C to 85°C operating range. It maintains identical slew rate (1 V/µs) and gain bandwidth product (1 MHz) as LMV344MAX, with improved output current capability (160 mA versus 113 mA). However, the maximum operating temperature is 85°C versus 125°C for LMV344MAX. Applications requiring operation above 85°C require alternative substitutes. Additionally, LMV324DR2G is classified as a voltage feedback amplifier rather than CMOS, which may affect circuit behavior in specific topologies.

Q6: What is the difference between ADA4891-4ARZ, ADA4891-4ARZ-R7, and ADA4891-4ARZ-RL?

A: All three variants are electrically identical with the same performance specifications. The differences are packaging formats: ADA4891-4ARZ is supplied in Tube packaging, ADA4891-4ARZ-R7 is supplied in Cut Tape & Digi-Reel format, and ADA4891-4ARZ-RL is supplied in Tape & Reel format. Selection depends on production requirements and inventory management preferences. Tube packaging is suitable for lower-volume applications, while Tape & Reel formats are standard for automated assembly lines.

Q7: Is RoHS compliance mandatory for substitution?

A: RoHS compliance is mandatory for applications subject to European Union regulations or equivalent regional requirements. All recommended substitute parts except the original LMV344MAX carry ROHS3 compliance certification. If RoHS compliance is required, LMV344MAX/NOPB or any alternative listed in this document is acceptable. The original LMV344MAX (non-NOPB version) is RoHS non-compliant and should not be used in new designs subject to RoHS regulations.

Q8: Can BU7487F-E2 be used as a substitute despite different package dimensions?

A: BU7487F-E2 uses a 14-SOP package (0.173", 4.40mm width) versus the 14-SOIC package (0.154", 3.90mm width) of LMV344MAX. While both are 14-pin surface mount packages, the different dimensions require PCB footprint verification and potential layout modifications. Electrically, BU7487F-E2 is compatible with enhanced slew rate (10 V/µs) and gain bandwidth product (10 MHz). Physical compatibility must be confirmed before substitution.

Q9: What is the significance of input bias current differences among substitutes?

A: Input bias current affects circuit accuracy in high-impedance applications. LMV344MAX features ultra-low input bias current (0.02 pA), making it suitable for precision instrumentation and high-impedance sensor interfaces. Substitutes vary significantly: ADA4891-4ARZ (2 pA), BU7487F-E2 (1 pA), LMV324BG-13 (15 nA), LMV324DR2G (1 nA), and MCP6244-E/SL (1 pA). For applications where input bias current is non-critical, higher values are acceptable. For precision applications, verify that substitute input bias current does not degrade system accuracy.

Q10: Are there supply voltage range limitations for substitutes?

A: Most substitutes support the full 2.7V to 5.5V supply voltage range of LMV344MAX. Exceptions include: BU7487F-E2 (minimum 3V, maximum 5.5V), LMR934F-GE2 (1.8V to 5V), and MCP6244-E/SL (1.8V to 5.5V). If your application requires operation at 2.7V minimum supply voltage, verify that the selected substitute supports this specification. BU7487F-E2 and LMR934F-GE2 are not suitable for 2.7V operation.

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