LMX358ASA-T Equivalent & Substitute Parts

Part Overview

The LMX358ASA-T is a general-purpose operational amplifier manufactured by Analog Devices Inc./Maxim Integrated, featuring dual circuits in an 8-SOIC surface-mount package. This device delivers rail-to-rail output capability with a 1.3 MHz gain-bandwidth product and operates across a 2.3 V to 7 V supply range. The LMX358ASA-T is classified as obsolete, necessitating identification of active alternative components that maintain functional and electrical compatibility for new designs and production continuity.

Key Parameters

Parameter	Value
Amplifier Type	General Purpose
Number of Circuits	2
Output Type	Rail-to-Rail
Package / Case	8-SOIC (0.154", 3.90mm Width)
Slew Rate	1 V/µs
Gain Bandwidth Product	1.3 MHz
Current - Input Bias	18 nA
Voltage - Input Offset	1 mV
Current - Supply	240 µA (x2 Channels)
Current - Output / Channel	28 mA
Voltage - Supply Span (Min)	2.3 V
Voltage - Supply Span (Max)	7 V
Operating Temperature	-40°C ~ 125°C
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the LMX358ASA-T is determined by the following critical parameters:

Primary Compatibility Criteria:

Dual-circuit (2 circuits) general-purpose operational amplifier architecture
Rail-to-rail output capability
8-SOIC surface-mount package with 0.154" (3.90mm) width
Operating temperature range of -40°C to 125°C (or compatible subset)
Supply voltage range compatibility (minimum 2.3 V to maximum 7 V, or compatible subset)
ROHS3 compliance and MSL 1 rating

Secondary Performance Parameters:

Slew rate of 1 V/µs or greater
Gain-bandwidth product of 1 MHz or greater
Input bias current ≤ 18 nA
Input offset voltage ≤ 1 mV
Output current per channel ≥ 28 mA

Substitute parts are grouped into two categories: Direct Package Equivalents (8-SOIC package) and Alternative Package Options (different surface-mount packages with equivalent electrical performance). Parts with active product status are prioritized over obsolete components.

Parameter Comparison

Part Number	Manufacturer	Product Status	Package	Slew Rate (V/µs)	GBW (MHz)	Input Bias (nA)	Input Offset (mV)	Supply Min (V)	Supply Max (V)	Temp Range (°C)	Output Current (mA)
LMX358ASA-T	Analog Devices/Maxim	Obsolete	8-SOIC	1.0	1.3	18	1.0	2.3	7.0	-40 to 125	28
AD8542ARZ	Analog Devices	Active	8-SOIC	0.92	1.0	0.004	1.0	2.7	5.5	-40 to 125	30
AD8542ARZ-REEL	Analog Devices	Active	8-SOIC	0.92	1.0	0.004	1.0	2.7	5.5	-40 to 125	30
AD8542ARZ-REEL7	Analog Devices	Active	8-SOIC	0.92	1.0	0.004	1.0	2.7	5.5	-40 to 125	30
AZV358MTR-E1	Diodes Incorporated	Active	8-SOIC	1.0	1.0	15	1.7	2.7	5.5	-40 to 85	60
AZV358MTR-G1	Diodes Incorporated	Active	8-SOIC	1.0	1.0	15	1.7	2.7	5.5	-40 to 85	60
LMV358DR2G	onsemi	Active	8-SOIC	1.0	1.0	1	1.7	2.7	5.5	-40 to 85	160
MAX4246AKA+T	Analog Devices/Maxim	Active	SOT-23-8	0.4	1.0	10	0.4	2.5	5.5	-40 to 125	30
APX358SG-13	Diodes Incorporated	Active	8-SOP	1.0	1.0	10	1.7	2.5	5.5	-40 to 85	90
BU7242F-E2	Rohm Semiconductor	Active	8-SOP	0.4	0.9	0.001	1.0	1.8	5.5	-40 to 85	12
BU7242SF-E2	Rohm Semiconductor	Active	8-SOP	0.4	0.9	0.001	1.0	1.8	5.5	-40 to 105	12

Engineering Selection Recommendations

Direct Package Equivalents (8-SOIC, Recommended for Pin-Compatible Replacement):

The AD8542ARZ, AD8542ARZ-REEL, and AD8542ARZ-REEL7 variants from Analog Devices provide the closest functional match to the LMX358ASA-T. All three share identical electrical specifications and the same 8-SOIC package footprint. These parts maintain the full -40°C to 125°C operating temperature range of the original component and carry active product status with ROHS3 compliance. The primary trade-off is a reduced maximum supply voltage (5.5 V versus 7 V) and lower supply current (45 µA versus 240 µA), which represents improved power efficiency. The AD8542 series exhibits superior input bias current performance (4 pA versus 18 nA), making it suitable for high-impedance input applications.

The AZV358MTR-E1 and AZV358MTR-G1 from Diodes Incorporated maintain the 8-SOIC package and 1 V/µs slew rate of the original part. These alternatives operate within a 2.7 V to 5.5 V supply range and support the -40°C to 85°C temperature window. Both variants deliver higher output current capability (60 mA per channel versus 28 mA), providing enhanced drive capability for capacitive loads.

The LMV358DR2G from onsemi offers the same 8-SOIC package with 1 V/µs slew rate and exceptional output current performance (160 mA per channel). This part operates across -40°C to 85°C and supports 2.7 V to 5.5 V supplies. The LMV358 series is characterized by extremely low input bias current (1 nA), making it ideal for precision instrumentation applications.

Alternative Package Options:

The MAX4246AKA+T in SOT-23-8 package provides an active alternative with full -40°C to 125°C temperature coverage and ROHS3 compliance. This part maintains the same dual-circuit architecture and rail-to-rail output but operates within a 2.5 V to 5.5 V supply range. The SOT-23-8 package is physically smaller than 8-SOIC, requiring PCB layout modification.

The APX358SG-13 from Diodes Incorporated and BU7242 series from Rohm Semiconductor offer alternative package options (8-SOP) with different electrical characteristics. The APX358SG-13 maintains 1 V/µs slew rate and supports -40°C to 85°C operation. The BU7242 variants feature CMOS architecture with extremely low input bias current (1 pA) but reduced slew rate (0.4 V/µs) and lower output current capability (12 mA), limiting suitability for high-speed or high-current applications.

Selection Priority:

AD8542ARZ series for direct replacement with improved efficiency and precision
AZV358MTR variants for enhanced output current capability
LMV358DR2G for maximum output current and precision applications
MAX4246AKA+T for space-constrained designs requiring full temperature range
Alternative package options only when PCB layout permits

Frequently Asked Questions (FAQ)

Q: Can the AD8542ARZ directly replace the LMX358ASA-T without PCB modifications?

A: Yes. The AD8542ARZ shares the identical 8-SOIC (0.154", 3.90mm) package footprint and pinout with the LMX358ASA-T. No PCB layout changes are required. However, the reduced maximum supply voltage (5.5 V versus 7 V) must be verified against your circuit design requirements.

Q: What is the primary difference between AD8542ARZ, AD8542ARZ-REEL, and AD8542ARZ-REEL7?

A: These three variants are electrically identical. The differences are packaging and delivery format: AD8542ARZ ships in tube packaging, while AD8542ARZ-REEL and AD8542ARZ-REEL7 are supplied on cut tape with Digi-Reel® for automated assembly. Select based on your production equipment and volume requirements.

Q: Why does the LMX358ASA-T have a 7 V maximum supply while most substitutes limit to 5.5 V?

A: The LMX358ASA-T was designed for broader supply compatibility, including 5 V and 3.3 V logic systems with higher tolerance margins. Modern alternatives optimize for standard 5 V and 3.3 V supplies, reducing component cost and power dissipation. If your design requires operation above 5.5 V, verify compatibility before substitution.

Q: Is the AZV358MTR-E1 suitable for applications requiring the full -40°C to 125°C temperature range?

A: No. The AZV358MTR-E1 operates only to 85°C maximum. If your application requires -40°C to 125°C operation, select the AD8542ARZ series or MAX4246AKA+T instead.

Q: What is the advantage of the LMV358DR2G over the AD8542ARZ?

A: The LMV358DR2G delivers significantly higher output current (160 mA per channel versus 30 mA), making it suitable for driving heavy capacitive loads or low-impedance outputs. However, it operates only to 85°C maximum. Select based on your output current requirements and temperature specifications.

Q: Can I use the MAX4246AKA+T as a direct replacement without redesigning the PCB?

A: No. The MAX4246AKA+T uses SOT-23-8 packaging, which is physically smaller and has a different footprint than the 8-SOIC package of the LMX358ASA-T. PCB layout modification is required. Use this option only when space constraints justify the redesign effort.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification, meeting environmental and hazardous substance restrictions equivalent to the original LMX358ASA-T.

Q: What does MSL 1 (Unlimited) mean for moisture sensitivity?

A: MSL 1 indicates the component can be stored indefinitely without moisture baking requirements prior to soldering. All listed substitutes maintain MSL 1 rating, ensuring compatibility with standard manufacturing processes.

Q: Which substitute offers the lowest power consumption?

A: The AD8542ARZ series consumes only 45 µA total supply current (x2 channels), compared to 240 µA for the LMX358ASA-T. This represents an 81% reduction in quiescent current, making it ideal for battery-powered or low-power applications.

Q: Can the BU7242 series replace the LMX358ASA-T in high-speed applications?

A: No. The BU7242 series features a 0.4 V/µs slew rate, significantly lower than the 1 V/µs of the LMX358ASA-T. Additionally, output current capability is limited to 12 mA per channel. Use BU7242 only for low-speed, low-current applications where CMOS characteristics (1 pA input bias) provide specific advantages.

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