LMX324ASD-T Equivalent & Substitute Parts

Part Overview

The LMX324ASD-T is a general purpose operational amplifier manufactured by Analog Devices Inc./Maxim Integrated, configured as a 4-circuit rail-to-rail amplifier in a 14-SOIC surface mount package. This device is classified as obsolete, indicating discontinuation from the manufacturer. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or maintenance requirements for systems utilizing this component.

Key Parameters

Parameter	Value
Amplifier Type	General Purpose
Number of Circuits	4
Output Type	Rail-to-Rail
Package / Case	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Slew Rate	1 V/µs
Gain Bandwidth Product	1.3 MHz
Voltage - Supply Span (Min)	2.3 V
Voltage - Supply Span (Max)	7 V
Operating Temperature	-40°C ~ 125°C
Current - Supply	480 µA (x4 Channels)
Current - Output / Channel	70 mA
Current - Input Bias	18 nA
Voltage - Input Offset	1 mV
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the LMX324ASD-T is determined by the following critical parameters:

Primary Substitution Criteria:

Package compatibility: 14-SOIC surface mount configuration
Circuit count: 4 independent amplifier circuits
Output architecture: Rail-to-rail output capability
Supply voltage range: Minimum 2.3 V to maximum 7 V operational span
Temperature range: -40°C to 125°C operating window
RoHS3 compliance and MSL rating

Secondary Compatibility Parameters:

Slew rate: 1 V/µs nominal performance
Gain bandwidth product: 1.3 MHz nominal
Input bias current: 18 nA nominal
Input offset voltage: 1 mV nominal
Supply current: 480 µA per 4 channels
Output current per channel: 70 mA

Substitute parts are grouped based on adherence to these electrical and mechanical specifications. Parts meeting all primary criteria are classified as direct substitutes. Parts with variations in secondary parameters are classified as functional alternatives with noted performance differences.

Parameter Comparison

Parameter	LMX324ASD-T	AD8544ARZ	ISL28413FBZ-T13	LMC6034IMX/NOPB	LMV324BG-13	LMV324DR2G	LMV324ID	LMV324IDT
Manufacturer	Analog Devices Inc./Maxim	Analog Devices Inc.	Renesas Electronics	Texas Instruments	Diodes Incorporated	onsemi	Texas Instruments	STMicroelectronics
Product Status	Obsolete	Active	Active	Active	Active	Active	Last Time Buy	Active
Number of Circuits	4	4	4	4	4	4	4	4
Output Type	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Not Specified	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail
Package / Case	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC	14-SOIC
Slew Rate (V/µs)	1	0.92	1	1.1	1	1	1	0.45
Gain Bandwidth Product (MHz)	1.3	1	2	1.4	1	1	1	1.3
Current - Input Bias (nA)	18	0.004	0.003	0.00004	15	0.001	15	16
Voltage - Input Offset (mV)	1	1	0.5	1	1.7	1.7	1.7	0.1
Current - Supply (µA x4 Channels)	480	45	90	1500	340	100	410	162
Current - Output / Channel (mA)	70	30	22	40	90	160	40	160
Voltage - Supply Span Min (V)	2.3	2.7	1.8	4.75	2.7	2.7	2.7	2.7
Voltage - Supply Span Max (V)	7	5.5	5.5	15.5	5.5	5.5	5.5	6
Operating Temperature (°C)	-40 ~ 125	-40 ~ 125	-40 ~ 125	-40 ~ 85	-40 ~ 125	-40 ~ 85	-40 ~ 125	-40 ~ 125
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount

Engineering Selection Recommendations

Tier 1 - Direct Substitutes (Active Status, Full Compatibility):

The following parts are classified as direct substitutes based on active product status, complete RoHS3 compliance, and operational parameter alignment within acceptable engineering tolerances:

LMV324IDT (STMicroelectronics): Active status, 14-SOIC package, 4-circuit rail-to-rail configuration, -40°C to 125°C operating range, ROHS3 compliant. Gain bandwidth product of 1.3 MHz matches the original specification. Input offset voltage of 100 µV exceeds original performance. Supply current of 162 µA per 4 channels is significantly lower than the original 480 µA, indicating improved power efficiency. Output current per channel of 160 mA exceeds the original 70 mA specification.
LMV324BG-13 (Diodes Incorporated): Active status, 14-SOIC package, 4-circuit rail-to-rail configuration, -40°C to 125°C operating range, ROHS3 compliant. Slew rate of 1 V/µs and gain bandwidth product of 1 MHz are within acceptable range. Supply current of 340 µA per 4 channels is lower than original. Output current per channel of 90 mA exceeds original specification.
LMV324ID (Texas Instruments): Last Time Buy status, 14-SOIC package, 4-circuit rail-to-rail configuration, -40°C to 125°C operating range, ROHS3 compliant. Slew rate of 1 V/µs and gain bandwidth product of 1 MHz match functional requirements. Supply current of 410 µA per 4 channels is lower than original. Output current per channel of 40 mA is lower than original specification.

Tier 2 - Functional Alternatives (Active Status, Parameter Variations):

The following parts are classified as functional alternatives with noted deviations from original specifications:

AD8544ARZ and AD8544ARZ-REEL / AD8544ARZ-REEL7 (Analog Devices Inc.): Active status, 14-SOIC package, 4-circuit rail-to-rail configuration, -40°C to 125°C operating range, ROHS3 compliant. Supply voltage span maximum of 5.5 V is lower than original 7 V specification. Supply current of 45 µA per 4 channels is significantly lower. Input bias current of 4 pA is substantially lower than original 18 nA. Output current per channel of 30 mA is lower than original specification.
ISL28413FBZ-T13 (Renesas Electronics Corporation): Active status, 14-SOIC package, 4-circuit rail-to-rail configuration, -40°C to 125°C operating range, ROHS3 compliant. Supply voltage span minimum of 1.8 V is lower than original 2.3 V specification. Gain bandwidth product of 2 MHz exceeds original specification. Input offset voltage of 500 µV is lower than original 1 mV. Supply current of 90 µA per 4 channels is significantly lower. Output current per channel of 22 mA is lower than original specification.
LMV324DR2G (onsemi): Active status, 14-SOIC package, 4-circuit rail-to-rail configuration, -40°C to 85°C operating range (lower than original -40°C to 125°C), ROHS3 compliant. Supply current of 100 µA per 4 channels is significantly lower. Output current per channel of 160 mA exceeds original specification.
LMV324IDR (UMW): Active status, 14-SOIC package, 4-circuit rail-to-rail configuration, -25°C to 85°C operating range (narrower than original), ROHS3 compliant. Supply voltage span minimum of 2.1 V is lower than original 2.3 V. Supply current of 45 µA is significantly lower. Output current per channel of 25 mA is lower than original specification.

Not Recommended:

LMC6034IMX/NOPB (Texas Instruments): CMOS amplifier type differs from original general purpose amplifier. Supply voltage span minimum of 4.75 V exceeds original maximum of 7 V upper limit compatibility. Operating temperature range of -40°C to 85°C is lower than original -40°C to 125°C. Supply current of 1.5 mA per 4 channels is substantially higher than original 480 µA specification.

Frequently Asked Questions (FAQ)

Q1: Can I directly replace LMX324ASD-T with LMV324IDT without circuit modifications?

A: LMV324IDT is a direct substitute based on package compatibility (14-SOIC), circuit count (4), output type (rail-to-rail), and operating temperature range (-40°C to 125°C). However, verify that your circuit design accommodates the lower input offset voltage (100 µV vs. 1 mV) and lower slew rate (0.45 V/µs vs. 1 V/µs). The significantly lower supply current (162 µA vs. 480 µA) and higher output current per channel (160 mA vs. 70 mA) may require power supply and thermal design review.

Q2: What is the primary reason LMX324ASD-T is obsolete?

A: The LMX324ASD-T is classified as obsolete by the manufacturer, indicating discontinuation from production. This is typical for older general purpose amplifier designs as manufacturers transition to newer architectures with improved performance characteristics, lower power consumption, and enhanced integration capabilities. Active alternatives with superior specifications are now available.

Q3: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed in this document are RoHS3 compliant, matching the original LMX324ASD-T compliance status. This ensures compatibility with environmental regulations and procurement requirements.

Q4: Which substitute offers the lowest power consumption?

A: AD8544ARZ, AD8544ARZ-REEL, AD8544ARZ-REEL7, and LMV324IDR all offer supply current of 45 µA per 4 channels, compared to the original 480 µA. This represents a 90% reduction in supply current. However, verify that the reduced supply voltage span maximum (5.5 V vs. 7 V) is compatible with your power supply design.

Q5: Can I use LMC6034IMX/NOPB as a substitute?

A: LMC6034IMX/NOPB is not recommended as a direct substitute. This device is a CMOS amplifier with different electrical characteristics, including a minimum supply voltage of 4.75 V (incompatible with the original 2.3 V minimum), maximum supply voltage of 15.5 V (exceeding the original 7 V maximum), and a narrower operating temperature range (-40°C to 85°C vs. -40°C to 125°C). Circuit redesign would be required.

Q6: What is the difference between 14-SOIC and 14-SO package designations?

A: 14-SOIC and 14-SO refer to the same physical package form factor: a 14-pin small outline integrated circuit with 0.154" (3.90 mm) width. The designations are used interchangeably by different manufacturers. All substitute parts in this document are compatible with the original 14-SOIC footprint.

Q7: Which substitute has the highest output current per channel?

A: LMV324IDT and LMV324DR2G both offer 160 mA output current per channel, compared to the original 70 mA. This represents a 2.3x increase in output drive capability. Verify that your circuit design can accommodate this increased output current without thermal or stability issues.

Q8: Are there packaging format differences among the substitutes?

A: Yes. Substitute parts are available in multiple packaging formats: Tube, Cut Tape (CT) & Digi-Reel®, and Tape & Reel (TR). The physical component package (14-SOIC) remains identical across all formats. Packaging format selection depends on procurement volume, handling equipment, and assembly line requirements. Verify packaging availability with your supplier.

Q9: What is the MSL (Moisture Sensitivity Level) rating, and why does it matter?

A: MSL indicates the maximum time a component can be exposed to ambient conditions (typically 30°C, 85% relative humidity) before requiring baking prior to soldering. LMX324ASD-T has MSL 1 (unlimited exposure). Most substitutes also have MSL 1, except LMV324BG-13 and LMV324DR2G with MSL 3 (168 hours maximum). MSL 3 components require more careful handling and storage protocols.

Q10: Can I use AD8544ARZ in applications requiring the full 7 V supply voltage range?

A: No. AD8544ARZ has a maximum supply voltage of 5.5 V, compared to the original 7 V maximum. Using this substitute in a 7 V supply application would exceed the device's absolute maximum ratings and cause failure. Verify your circuit's actual operating supply voltage before selecting this substitute.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message