LMV324QD Equivalent & Substitute Parts

Part Overview

The LMV324QD is a general-purpose operational amplifier manufactured by Texas Instruments, featuring four independent circuits in a 14-SOIC surface-mount package. This device is classified as Last Time Buy, indicating discontinued production with limited inventory availability. The LMV324QD operates across a 2.7 V to 5.5 V supply range with rail-to-rail output capability, making it suitable for low-voltage analog signal processing applications. Due to its Last Time Buy status, identifying functionally equivalent substitute parts is essential for design continuity and long-term component sourcing.

Key Parameters

Parameter	Value	Unit
Amplifier Type	General Purpose	—
Number of Circuits	4	—
Output Type	Rail-to-Rail	—
Slew Rate	1	V/µs
Gain Bandwidth Product	1	MHz
Current - Input Bias	15	nA
Voltage - Input Offset	1.7	mV
Current - Supply (x4 Channels)	410	µA
Current - Output / Channel	40	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	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the LMV324QD are grouped based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

Critical Matching Parameters:

Four independent operational amplifier circuits
Rail-to-rail output configuration
14-SOIC surface-mount package (0.154", 3.90mm width)
Supply voltage range: 2.7 V to 5.5 V minimum
Operating temperature range: -40°C to 125°C minimum
General-purpose amplifier classification

Secondary Compatibility Parameters:

Slew rate: 1 V/µs or greater
Gain bandwidth product: 1 MHz or greater
Input bias current: 15 nA or lower
Input offset voltage: 1.7 mV or lower
Output current per channel: 40 mA or greater
Supply current: 410 µA or lower (for x4 channels)

Substitutes are divided into two categories: Direct Replacements (identical electrical specifications and packaging) and Functional Equivalents (meet or exceed all critical parameters with minor specification variations).

Parameter Comparison

Part Number	Manufacturer	Amplifier Type	Slew Rate (V/µs)	GBW (MHz)	Input Bias (nA)	Input Offset (mV)	Output Current (mA)	Supply Current (µA)	Temp Range (°C)	Package	Status
LMV324QD	Texas Instruments	General Purpose	1	1	15	1.7	40	410	-40 to 125	14-SOIC	Last Time Buy
LMV324QDR	Texas Instruments	General Purpose	1	1	15	1.7	40	410	-40 to 125	14-SOIC	Active
LMV324M/NOPB	Texas Instruments	General Purpose	1	1	15	1.7	160	410	-40 to 125	14-SOIC	Active
LMV324MX/NOPB	Texas Instruments	General Purpose	1	1	15	1.7	160	410	-40 to 125	14-SOIC	Active
LPV324M/NOPB	Texas Instruments	General Purpose	0.1	0.152	2	1.5	16	28	-40 to 85	14-SOIC	Active
LPV324MX/NOPB	Texas Instruments	General Purpose	0.1	0.152	2	1.5	16	28	-40 to 85	14-SOIC	Active
AD8544ARZ	Analog Devices Inc.	General Purpose	0.92	1	0.004	1	30	45	-40 to 125	14-SOIC	Active
AD8544ARZ-REEL	Analog Devices Inc.	General Purpose	0.92	1	0.004	1	30	45	-40 to 125	14-SOIC	Active
AD8544WARZ-RL	Analog Devices Inc.	General Purpose	0.92	1	0.004	1	30	45	-40 to 125	14-SOIC	Active
BU7244F-E2	Rohm Semiconductor	CMOS	0.4	0.9	0.001	1	12	360	-40 to 85	14-SOP	Active
BU7244SF-E2	Rohm Semiconductor	CMOS	0.4	0.9	0.001	1	12	360	-40 to 85	14-SOP	Active

Engineering Selection Recommendations

Tier 1: Direct Replacements (Recommended)

LMV324QDR, LMV324M/NOPB, and LMV324MX/NOPB are direct functional replacements manufactured by Texas Instruments. These parts maintain identical electrical specifications to the LMV324QD across all critical parameters: 1 V/µs slew rate, 1 MHz gain bandwidth product, 15 nA input bias current, and -40°C to 125°C operating temperature range. The primary difference is product status: all three are Active, ensuring long-term availability and supply chain stability. LMV324QDR and LMV324MX/NOPB offer higher inventory levels (3000 and 177800 units respectively) compared to the LMV324QD (1035 units). LMV324M/NOPB and LMV324MX/NOPB provide enhanced output current capability (160 mA per channel versus 40 mA), which exceeds the original specification and supports higher-load applications without circuit modification. All three parts are ROHS3 compliant with MSL 1 rating.

Tier 2: Functional Equivalents with Enhanced Performance

AD8544ARZ, AD8544ARZ-REEL, and AD8544WARZ-RL (Analog Devices Inc.) meet or exceed all critical electrical parameters while maintaining the 14-SOIC package and -40°C to 125°C temperature range. These parts feature superior input bias current (4 pA versus 15 nA) and lower input offset voltage (1 mV versus 1.7 mV), resulting in improved precision for signal conditioning applications. Slew rate (0.92 V/µs) and gain bandwidth product (1 MHz) are comparable to the LMV324QD. Supply current is lower (45 µA versus 410 µA), providing power efficiency benefits. Output current per channel (30 mA) is slightly reduced but remains adequate for most general-purpose applications. All three variants are Active with substantial inventory availability (15845, 4790, and 24710 units respectively).

Tier 3: Low-Power Alternatives

LPV324M/NOPB and LPV324MX/NOPB (Texas Instruments) are suitable for applications prioritizing ultra-low power consumption. These parts reduce supply current to 28 µA (x4 channels) and output current to 16 mA per channel. However, they exhibit reduced performance specifications: slew rate of 0.1 V/µs and gain bandwidth product of 152 kHz. Operating temperature range is limited to -40°C to 85°C. These parts are appropriate only for low-frequency, low-speed signal processing where the LMV324QD's performance exceeds application requirements.

Tier 4: Alternative Package Consideration

BU7244F-E2 and BU7244SF-E2 (Rohm Semiconductor) are CMOS amplifiers in 14-SOP package (0.173", 4.40mm width) with different mechanical footprint. While electrically compatible in terms of four-circuit configuration and rail-to-rail output, the package width difference (4.40mm versus 3.90mm) requires PCB layout verification. These parts feature ultra-low input bias current (1 pA) and reduced supply current (360 µA), but lower slew rate (0.4 V/µs), reduced gain bandwidth product (900 kHz), and limited output current (12 mA per channel). Operating temperature range is -40°C to 85°C. Selection of these parts requires confirmation that the wider package footprint is compatible with existing PCB designs.

Frequently Asked Questions (FAQ)

Q1: Can LMV324M/NOPB or LMV324MX/NOPB be used as direct drop-in replacements for LMV324QD?

A: Yes. LMV324M/NOPB and LMV324MX/NOPB are direct pin-compatible replacements with identical electrical specifications for all critical parameters: slew rate, gain bandwidth product, input bias current, input offset voltage, and supply voltage range. The primary difference is enhanced output current capability (160 mA per channel versus 40 mA), which provides additional design margin without requiring circuit modifications. Both parts are Active status with superior inventory availability.

Q2: What is the key difference between LMV324QDR and LMV324MX/NOPB?

A: LMV324QDR and LMV324MX/NOPB are electrically identical with the same 1 V/µs slew rate, 1 MHz gain bandwidth product, and -40°C to 125°C operating range. The difference is packaging format: LMV324QDR is supplied in Cut Tape (CT) & Digi-Reel format (3000 units available), while LMV324MX/NOPB is supplied in Cut Tape & Digi-Reel format with significantly higher inventory (177800 units). Both are Active status. Selection depends on procurement volume and packaging preference.

Q3: Why would AD8544ARZ be preferred over LMV324QD variants?

A: AD8544ARZ offers superior precision characteristics: input bias current of 4 pA (versus 15 nA) and input offset voltage of 1 mV (versus 1.7 mV). These improvements benefit precision analog signal conditioning, instrumentation, and measurement applications where input offset drift and bias current errors must be minimized. AD8544ARZ also provides lower supply current (45 µA versus 410 µA), reducing power consumption. The trade-off is slightly lower output current per channel (30 mA versus 40 mA). AD8544ARZ is Active status with high inventory availability.

Q4: Are LPV324M/NOPB and LPV324MX/NOPB suitable replacements for all LMV324QD applications?

A: No. LPV324M/NOPB and LPV324MX/NOPB are low-power variants with significantly reduced performance: slew rate of 0.1 V/µs (versus 1 V/µs) and gain bandwidth product of 152 kHz (versus 1 MHz). These specifications are inadequate for applications requiring fast signal processing or high-frequency response. Operating temperature range is also limited to -40°C to 85°C. These parts are suitable only for low-frequency, low-speed applications where the LMV324QD's performance exceeds requirements.

Q5: Can BU7244F-E2 replace LMV324QD in existing PCB designs?

A: BU7244F-E2 is electrically compatible as a four-circuit rail-to-rail amplifier but requires PCB layout verification. The package width is 4.40mm (14-SOP) versus 3.90mm (14-SOIC) for LMV324QD, resulting in a wider mechanical footprint. Pin spacing and lead configuration may differ, requiring confirmation that the component fits existing PCB pads and routing. Additionally, BU7244F-E2 has reduced performance specifications (0.4 V/µs slew rate, 900 kHz gain bandwidth product, 12 mA output current per channel) and limited operating temperature range (-40°C to 85°C). Selection requires both PCB compatibility verification and confirmation that reduced performance specifications meet application requirements.

Q6: What compliance certifications apply to all substitute parts?

A: All substitute parts listed are ROHS3 compliant and carry Moisture Sensitivity Level (MSL) 1 rating (Unlimited), matching the LMV324QD. All parts are classified under ECCN EAR99 and HTSUS 8542.33.0001. REACH status is Unaffected for all parts. These certifications ensure compatibility with environmental regulations and supply chain requirements across global markets.

Q7: Which substitute part offers the best inventory availability?

A: LMV324MX/NOPB offers the highest inventory availability with 177800 units in stock. This part is electrically identical to LMV324QD with enhanced output current capability (160 mA per channel) and Active product status, ensuring long-term supply continuity. LMV324MX/NOPB is the recommended choice for new designs or high-volume production requiring assured component availability.

Q8: Are there performance trade-offs when selecting AD8544 variants over LMV324 variants?

A: AD8544 variants offer superior precision (lower input bias current and input offset voltage) and lower power consumption but have slightly reduced output current per channel (30 mA versus 40 mA). Slew rate and gain bandwidth product are comparable. The choice depends on application priorities: if precision and power efficiency are critical, AD8544 is preferred; if maximum output current is required, LMV324M/NOPB or LMV324MX/NOPB are better choices.

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