LMX358ASA+ Equivalent & Substitute Parts Reference

Part Overview

The LMX358ASA+ 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+ is classified as obsolete; therefore, identifying functionally equivalent active alternatives is essential for ongoing design support, production continuity, and new project implementations.

Key Parameters

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

Substitute Part Grouping Explanation

Substitution of the LMX358ASA+ is determined by the following critical parameters:

Primary Substitution Criteria:

Dual-circuit configuration (2 circuits required)
Rail-to-rail output capability
General-purpose amplifier classification
8-pin surface-mount package (8-SOIC or equivalent footprint)
Operating temperature range: −40°C to 125°C (or compatible subset)
Supply voltage compatibility: minimum 2.3 V to 7 V span

Secondary Compatibility Parameters:

Slew rate ≥ 0.4 V/µs
Gain-bandwidth product ≥ 900 kHz
Input bias current ≤ 18 nA
Input offset voltage ≤ 1.7 mV
Output current per channel ≥ 28 mA
Supply current ≤ 375 µA (x2 channels)

Substitute parts are grouped into two categories:

Category A: Direct Package Equivalents (8-SOIC) Parts maintaining identical 8-SOIC packaging with full parameter compatibility across the specified operating temperature range.

Category B: Functional Equivalents (Alternative Packages) Parts with equivalent electrical performance but different surface-mount packages (SOT-23-8, 8-SOP) requiring PCB layout modification.

Parameter Comparison

Part Number	Manufacturer	Package	Slew Rate (V/µs)	GBW (MHz)	Input Bias (nA)	Input Offset (mV)	Supply Current (µA)	Output Current (mA)	Supply Min (V)	Supply Max (V)	Temp Range (°C)	Status
LMX358ASA+	Analog Devices/Maxim	8-SOIC	1.0	1.3	18	1.0	240	28	2.3	7.0	−40 to 125	Obsolete
AD8542ARZ	Analog Devices	8-SOIC	0.92	1.0	0.004	1.0	45	30	2.7	5.5	−40 to 125	Active
AD8542ARZ-REEL	Analog Devices	8-SOIC	0.92	1.0	0.004	1.0	45	30	2.7	5.5	−40 to 125	Active
AD8542ARZ-REEL7	Analog Devices	8-SOIC	0.92	1.0	0.004	1.0	45	30	2.7	5.5	−40 to 125	Active
AZV358MTR-E1	Diodes Incorporated	8-SOIC	1.0	1.0	15	1.7	210	60	2.7	5.5	−40 to 85	Active
AZV358MTR-G1	Diodes Incorporated	8-SOIC	1.0	1.0	15	1.7	210	60	2.7	5.5	−40 to 85	Active
LMV342MA/NOPB	National Semiconductor	8-SOIC	1.0	1.0	0.00002	0.7	107	113	2.7	5.5	−40 to 125	Active
MAX4246AKA+T	Analog Devices/Maxim	SOT-23-8	0.4	1.0	10	0.4	375	30	2.5	5.5	−40 to 125	Active
APX358SG-13	Diodes Incorporated	8-SOP	1.0	1.0	10	1.7	190	90	2.5	5.5	−40 to 85	Active
BU7242F-E2	Rohm Semiconductor	8-SOP	0.4	0.9	0.001	1.0	180	12	1.8	5.5	−40 to 85	Active
BU7242SF-E2	Rohm Semiconductor	8-SOP	0.4	0.9	0.001	1.0	180	12	1.8	5.5	−40 to 105	Active

Engineering Selection Recommendations

For Direct Replacement (8-SOIC Package, −40°C to 125°C Operating Range):

The AD8542ARZ, AD8542ARZ-REEL, and AD8542ARZ-REEL7 are active products from Analog Devices with identical 8-SOIC packaging and full −40°C to 125°C temperature coverage. These devices maintain ROHS3 compliance and MSL-1 moisture sensitivity rating. The AD8542 series exhibits superior input bias current performance (4 pA versus 18 nA) and reduced supply current (45 µA versus 240 µA), making them suitable for low-power applications. Supply voltage range is constrained to 2.7 V to 5.5 V, which is compatible with the LMX358ASA+ in most standard applications but does not extend to the full 7 V maximum of the original part.

The LMV342MA/NOPB offers the widest supply voltage range (2.7 V to 5.5 V) with exceptional input bias current (0.02 pA) and the highest output current capability (113 mA per channel). This part maintains −40°C to 125°C operation and ROHS3 compliance, making it suitable for applications requiring extended temperature operation and high output drive capability.

For Package-Flexible Applications (Alternative Surface-Mount Packages):

The MAX4246AKA+T in SOT-23-8 packaging provides a smaller footprint alternative with −40°C to 125°C coverage and ROHS3 compliance. This part is suitable for space-constrained designs where PCB layout modification is acceptable.

The APX358SG-13 and AZV358MTR series (8-SOP package) from Diodes Incorporated maintain 1 V/µs slew rate matching the original LMX358ASA+ but operate only to 85°C maximum. These parts are appropriate for applications with reduced temperature requirements and where 8-SOP footprint compatibility exists.

For Low-Power, Low-Bias-Current Applications:

The BU7242F-E2 and BU7242SF-E2 from Rohm Semiconductor are CMOS amplifiers with exceptionally low input bias current (1 pA) and reduced supply current (180 µA). These parts operate to 85°C and 105°C respectively, with supply range 1.8 V to 5.5 V. Output current per channel is limited to 12 mA, restricting use to low-drive applications.

Compliance and Certification:

All recommended substitutes maintain ROHS3 compliance and EAR99 export classification. Moisture sensitivity levels range from MSL-1 (unlimited) to MSL-3 (168 hours), with MSL-1 parts preferred for standard manufacturing environments.

Frequently Asked Questions (FAQ)

Q: Can the AD8542ARZ directly replace the LMX358ASA+ without PCB modification?

A: Yes. The AD8542ARZ maintains identical 8-SOIC packaging and pinout. However, the maximum supply voltage is reduced from 7 V to 5.5 V. Verify that your application operates within the 2.7 V to 5.5 V range. Supply current is significantly lower (45 µA versus 240 µA), which may improve overall system power efficiency.

Q: What is the primary limitation of the BU7242 series as a substitute?

A: The BU7242F-E2 and BU7242SF-E2 deliver only 12 mA output current per channel, compared to 28 mA for the LMX358ASA+. These parts are unsuitable for applications requiring higher output drive capability. Additionally, maximum operating temperature is limited to 85°C or 105°C, not 125°C.

Q: Does the LMV342MA/NOPB require different PCB layout compared to the LMX358ASA+?

A: No. The LMV342MA/NOPB uses identical 8-SOIC packaging and pinout. No PCB modification is required. This part is recommended for applications requiring extended temperature operation (−40°C to 125°C) and high output current (113 mA per channel).

Q: Why is the MAX4246AKA+T packaged in SOT-23-8 instead of 8-SOIC?

A: The SOT-23-8 package provides a smaller physical footprint, reducing PCB area. This alternative is suitable for space-constrained designs where PCB layout modification is acceptable. Electrical performance remains compatible with the LMX358ASA+ across the −40°C to 125°C range.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All recommended substitute parts listed maintain ROHS3 compliance and are suitable for applications requiring RoHS certification.

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

A: These three part numbers are electrically identical. The differences are packaging format: AD8542ARZ is supplied in Tube, AD8542ARZ-REEL in Cut Tape & Digi-Reel®, and AD8542ARZ-REEL7 also in Cut Tape & Digi-Reel® format. Select based on your procurement and assembly requirements.

Q: Can I use the APX358SG-13 in a design requiring −40°C to 125°C operation?

A: No. The APX358SG-13 operates only to 85°C maximum. For applications requiring full −40°C to 125°C coverage, select AD8542ARZ, LMV342MA/NOPB, or MAX4246AKA+T.

Q: What is the moisture sensitivity level (MSL) requirement for standard manufacturing?

A: MSL-1 (unlimited shelf life) is preferred for standard manufacturing environments. All AD8542 variants, LMV342MA/NOPB, MAX4246AKA+T, and BU7242 series meet MSL-1 requirements. The AZV358MTR-G1 and APX358SG-13 are rated MSL-3 (168 hours), requiring controlled storage conditions.

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