LPV324M Equivalent & Substitute Parts

Part Overview

The LPV324M is a general-purpose operational amplifier manufactured by Texas Instruments, configured as a 4-circuit rail-to-rail device in a 14-SOIC surface-mount package. This part is classified as obsolete, with 1,408 units currently in stock. The LPV324M operates across a supply voltage range of 2.7 V to 5 V and is rated for temperatures from -40°C to 85°C.

Due to its obsolete status, identifying equivalent and substitute parts is necessary for design continuity, long-term availability assurance, and compliance with current manufacturing standards. Active alternatives with comparable or enhanced electrical characteristics are available from multiple manufacturers.

Key Parameters

Parameter	Value	Unit
Amplifier Type	General Purpose	—
Number of Circuits	4	—
Output Type	Rail-to-Rail	—
Slew Rate	0.1	V/µs
Gain Bandwidth Product	152	kHz
Current - Input Bias	2	nA
Voltage - Input Offset	1.5	mV
Current - Supply (x4 Channels)	28	µA
Current - Output / Channel	16	mA
Voltage - Supply Span (Min)	2.7	V
Voltage - Supply Span (Max)	5	V
Operating Temperature	-40 to 85	°C
Package / Case	14-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—
RoHS Status	RoHS non-compliant	—

Substitute Part Grouping Explanation

Substitution of the LPV324M is determined by the following critical parameters:

Mandatory Compatibility Criteria:

Number of circuits: 4 channels
Output type: Rail-to-Rail
Package: 14-SOIC surface mount
Supply voltage range: Minimum 2.7 V, Maximum 5 V (or compatible overlap)
Operating temperature: -40°C to 85°C (or extended range)

Electrical Performance Considerations:

Slew rate, gain bandwidth product, input bias current, and input offset voltage determine functional equivalence
Supply current and output current per channel affect power budget and load-driving capability

Substitute parts are grouped into two categories:

Category 1: Direct Functional Equivalents (General Purpose Amplifiers) Parts maintaining general-purpose amplifier classification with comparable or superior electrical performance within the 14-SOIC package footprint.

Category 2: Enhanced Performance Alternatives (CMOS Amplifiers) Parts offering improved slew rate, bandwidth, or input bias current characteristics, suitable for applications requiring higher performance margins.

Parameter Comparison

Part Number	Manufacturer	Amplifier Type	Slew Rate (V/µs)	GBW (kHz)	Input Bias (nA/pA)	Supply Current (µA)	Output Current (mA)	Supply Min (V)	Supply Max (V)	Temp Range (°C)	Package	Product Status	RoHS Status
LPV324M	Texas Instruments	General Purpose	0.1	152	2 nA	28	16	2.7	5	-40 to 85	14-SOIC	Obsolete	Non-compliant
LPV324M/NOPB	Texas Instruments	General Purpose	0.1	152	2 nA	28	16	2.7	5	-40 to 85	14-SOIC	Active	ROHS3 Compliant
MCP6234T-E/SL	Microchip Technology	General Purpose	0.15	300	1 pA	20	23	1.8	6	-40 to 125	14-SOIC	Active	ROHS3 Compliant
MCP6234-E/SL	Microchip Technology	General Purpose	0.15	300	1 pA	20	23	1.8	6	-40 to 125	14-SOIC	Active	ROHS3 Compliant
MCP6484-E/SL	Microchip Technology	General Purpose	2.7	4000	1 pA	240	12	2.2	5.5	-40 to 125	14-SOIC	Active	ROHS3 Compliant
MCP6484T-E/SL	Microchip Technology	General Purpose	2.7	4000	1 pA	240	12	2.2	5.5	-40 to 125	14-SOIC	Active	ROHS3 Compliant
LMR934F-GE2	Rohm Semiconductor	General Purpose	0.35	1400	5 nA	250	90	1.8	5	-40 to 85	14-SOP	Active	ROHS3 Compliant
MCP6474-E/SL	Microchip Technology	CMOS	1.1	2000	1 pA	100	32	2	5.5	-40 to 125	14-SOIC	Active	ROHS3 Compliant
MCP6474T-E/SL	Microchip Technology	CMOS	1.1	2000	1 pA	100	32	2	5.5	-40 to 125	14-SOIC	Active	ROHS3 Compliant
BU7487F-E2	Rohm Semiconductor	CMOS	10	10000	1 pA	6	12	3	5.5	-40 to 105	14-SOP	Active	ROHS3 Compliant
MCP6494-E/SL	Microchip Technology	General Purpose	6	7500	1 pA	530	15	2.4	5.5	-40 to 125	14-SOIC	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: LPV324M/NOPB

The LPV324M/NOPB is the direct equivalent of the obsolete LPV324M, manufactured by Texas Instruments. It maintains identical electrical specifications and package configuration while offering active product status and ROHS3 compliance. This part is the preferred choice for direct replacement in existing designs without modification.

Secondary Recommendations for Enhanced Performance:

MCP6234T-E/SL and MCP6234-E/SL (Microchip Technology)

These general-purpose amplifiers provide improved specifications over the LPV324M:

Higher gain bandwidth product (300 kHz vs. 152 kHz)
Lower input bias current (1 pA vs. 2 nA)
Extended operating temperature range (-40°C to 125°C)
Expanded supply voltage range (1.8 V to 6 V)
ROHS3 compliant and active product status

The MCP6234T-E/SL variant is supplied in cut tape and digi-reel packaging with significantly higher inventory availability (35,300 units).

MCP6484-E/SL and MCP6484T-E/SL (Microchip Technology)

These general-purpose amplifiers offer substantially higher performance:

Slew rate of 2.7 V/µs (27× faster than LPV324M)
Gain bandwidth product of 4 MHz (26× higher)
Input bias current of 1 pA
Extended temperature range (-40°C to 125°C)
ROHS3 compliant and active product status

Selection of MCP6484 variants is appropriate for applications requiring higher bandwidth or faster transient response.

MCP6474-E/SL and MCP6474T-E/SL (Microchip Technology, CMOS)

These CMOS amplifiers provide intermediate performance with low supply current:

Slew rate of 1.1 V/µs
Gain bandwidth product of 2 MHz
Input bias current of 1 pA
Supply current of 100 µA (3.6× higher than LPV324M but lower than MCP6484)
Extended temperature range (-40°C to 125°C)
ROHS3 compliant and active product status

LMR934F-GE2 (Rohm Semiconductor)

This general-purpose amplifier is suitable for applications requiring higher output current capability:

Output current per channel of 90 mA (5.6× higher than LPV324M)
Slew rate of 0.35 V/µs
Gain bandwidth product of 1.4 MHz
Supply voltage range of 1.8 V to 5 V
Operating temperature range of -40°C to 85°C (matches LPV324M)
ROHS3 compliant and active product status
Package: 14-SOP (0.173" width, slightly wider than LPV324M 14-SOIC)

BU7487F-E2 (Rohm Semiconductor, CMOS)

This CMOS amplifier is recommended for applications requiring maximum bandwidth and minimal supply current:

Slew rate of 10 V/µs
Gain bandwidth product of 10 MHz
Input bias current of 1 pA
Supply current of 6 µA (lowest among all alternatives)
Operating temperature range of -40°C to 105°C
ROHS3 compliant and active product status
Package: 14-SOP (0.173" width)

Compliance and Availability Considerations:

All recommended substitute parts carry ROHS3 compliance certification, addressing the non-compliant status of the original LPV324M. All substitute parts maintain active product status, ensuring long-term availability and manufacturing support. Inventory levels vary; MCP6234T-E/SL offers the highest stock position at 35,300 units.

Frequently Asked Questions (FAQ)

Q1: Can I directly replace LPV324M with LPV324M/NOPB without any circuit modifications?

A: Yes. The LPV324M/NOPB is electrically and mechanically identical to the LPV324M. The only differences are product status (active vs. obsolete) and RoHS compliance (ROHS3 vs. non-compliant). No circuit modifications are required.

Q2: What is the primary difference between the MCP6234 and MCP6484 series?

A: The MCP6484 series offers significantly higher performance: slew rate of 2.7 V/µs versus 0.15 V/µs, and gain bandwidth product of 4 MHz versus 300 kHz. The MCP6484 is suitable for applications requiring faster response times and higher bandwidth. The MCP6234 is appropriate for applications with performance requirements similar to or slightly exceeding the LPV324M.

Q3: Why do some substitute parts have different package widths (14-SOIC vs. 14-SOP)?

A: The LPV324M uses a 14-SOIC package with 0.154" width. Some alternatives, such as LMR934F-GE2 and BU7487F-E2, use 14-SOP packages with 0.173" width. While both are 14-pin surface-mount packages, the slightly wider SOP package may require PCB layout verification to ensure clearance with adjacent components. Pin pitch and spacing remain compatible.

Q4: What does "ROHS3 Compliant" mean, and why is it important?

A: ROHS3 (Restriction of Hazardous Substances Directive 3) compliance indicates that the component meets European Union environmental standards by restricting the use of specific hazardous materials such as lead, cadmium, and mercury. This certification is increasingly required by OEMs and regulatory bodies. The original LPV324M is non-compliant; all substitute parts listed are ROHS3 compliant.

Q5: Which substitute part has the lowest power consumption?

A: The BU7487F-E2 has the lowest supply current at 6 µA (total for 4 channels), compared to 28 µA for the LPV324M. The MCP6234 series offers 20 µA, and the MCP6474 series offers 100 µA. Selection depends on whether low power consumption is a primary design requirement.

Q6: Can I use a substitute part with a higher operating temperature range in a design rated for -40°C to 85°C?

A: Yes. A part rated for -40°C to 125°C can be used in applications requiring only -40°C to 85°C operation. The extended temperature range provides additional design margin and flexibility for future applications. No circuit modifications are necessary.

Q7: What is the significance of input bias current differences (2 nA vs. 1 pA)?

A: Input bias current affects circuit accuracy in high-impedance applications. The LPV324M has an input bias current of 2 nA. Most substitute parts offer 1 pA (0.001 nA), which is 2,000 times lower. This improvement is beneficial for precision instrumentation, sensor interfaces, and high-impedance signal conditioning circuits. For general-purpose applications with moderate impedance levels, the difference is negligible.

Q8: Are the MCP6234T-E/SL and MCP6234-E/SL electrically identical?

A: Yes, they are electrically identical. The difference is in packaging: MCP6234T-E/SL is supplied in cut tape and digi-reel format (35,300 units in stock), while MCP6234-E/SL is supplied in tube format (1,700 units in stock). Selection depends on assembly process requirements and inventory availability.

Q9: What does "General Purpose" versus "CMOS" amplifier classification mean?

A: General Purpose amplifiers (such as LPV324M, MCP6234, MCP6484) use bipolar or mixed-signal technology and are optimized for a broad range of applications. CMOS amplifiers (such as MCP6474, BU7487F-E2) use complementary metal-oxide-semiconductor technology, offering advantages in low power consumption and high input impedance. CMOS amplifiers typically have lower input bias current (1 pA) compared to general-purpose types.

Q10: If my application requires output current greater than 16 mA per channel, which substitute should I consider?

A: The LMR934F-GE2 offers 90 mA per channel output current, and the MCP6474 series offers 32 mA per channel. Both exceed the LPV324M's 16 mA capability. The LMR934F-GE2 is recommended for applications requiring maximum output drive capability. Verify that the higher supply current requirements (250 µA for LMR934F-GE2 vs. 28 µA for LPV324M) are acceptable in your power budget.

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