LMX358IST Equivalent & Substitute Parts

Part Overview

The LMX358IST is a general-purpose operational amplifier manufactured by STMicroelectronics, featuring dual circuits in a rail-to-rail configuration. This device is housed in an 8-MiniSO surface-mount package and is designed for applications requiring low-power, dual-channel amplification across a wide supply voltage range. The part is currently in active production status with substantial inventory availability.

Substitute parts become necessary when the LMX358IST reaches end-of-life status, when specific application requirements demand alternative electrical characteristics, or when alternative packaging formats are required for design optimization. The substitute parts listed maintain functional equivalence through matching circuit count, output type, and operating temperature range while offering variations in electrical performance parameters.

Key Parameters

Parameter	Value	Unit
Amplifier Type	General Purpose	—
Number of Circuits	2	—
Output Type	Rail-to-Rail	—
Slew Rate	0.7	V/µs
Gain Bandwidth Product	1.3	MHz
Current - Input Bias	27	nA
Voltage - Input Offset	4	mV
Current - Supply (x2 Channels)	130	µA
Current - Output / Channel	70	mA
Voltage - Supply Span (Min)	2.3	V
Voltage - Supply Span (Max)	5.5	V
Operating Temperature	-40 to 125	°C
Mounting Type	Surface Mount	—
Package / Case	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the LMX358IST is determined by the following critical parameters: dual-circuit configuration, rail-to-rail output capability, surface-mount technology, and operating temperature range of -40°C to 125°C. All substitute parts maintain these core functional requirements.

The substitute parts are grouped into two categories based on amplifier type and electrical performance characteristics:

Category 1: General Purpose Amplifiers — Parts maintaining general-purpose amplifier classification with comparable slew rates and gain-bandwidth products. These include the AD8542ARUZ and LMV358IPW/LMV358IPWR variants.

Category 2: CMOS Amplifiers — Parts utilizing CMOS technology with varying performance profiles. The BU7242FVM-TR, BU7242SFVM-TR, BU7266FVM-TR, BU7266SFVM-TR, BU7486FVM-TR, LMV342IDGKR, and LMV342MM/NOPB represent this category with performance ranges from ultra-low-power to high-speed configurations.

All substitute parts comply with ROHS3 standards, maintain MSL 1 rating, and operate across the -40°C to 125°C temperature range (with limited exceptions noted in individual specifications). Package variations include 8-TSSOP, 8-MSOP, and 8-VSSOP formats, all suitable for surface-mount assembly.

Parameter Comparison

Part Number	Manufacturer	Amplifier Type	Number of Circuits	Output Type	Slew Rate (V/µs)	GBW (MHz)	Input Bias (nA/pA)	Input Offset (mV/µV)	Supply Current (µA)	Output Current (mA)	Supply Min (V)	Supply Max (V)	Temp Range (°C)	Package
LMX358IST	STMicroelectronics	General Purpose	2	Rail-to-Rail	0.7	1.3	27 nA	4 mV	130	70	2.3	5.5	-40 to 125	8-MiniSO
AD8542ARUZ	Analog Devices Inc.	General Purpose	2	Rail-to-Rail	0.92	1	4 pA	1 mV	45	30	2.7	5.5	-40 to 125	8-TSSOP
BU7242FVM-TR	Rohm Semiconductor	CMOS	2	Rail-to-Rail	0.4	0.9	1 pA	1 mV	180	12	1.8	5.5	-40 to 85	8-MSOP
BU7242SFVM-TR	Rohm Semiconductor	CMOS	2	Rail-to-Rail	0.4	0.9	1 pA	1 mV	180	12	1.8	5.5	-40 to 105	8-MSOP
BU7266FVM-TR	Rohm Semiconductor	CMOS	2	Rail-to-Rail	0.0024	0.004	1 pA	1 mV	0.7	4	1.8	5.5	-40 to 85	8-MSOP
BU7266SFVM-TR	Rohm Semiconductor	CMOS	2	Rail-to-Rail	0.0024	0.004	1 pA	1 mV	0.7	4	1.8	5.5	-40 to 105	8-MSOP
BU7486FVM-TR	Rohm Semiconductor	CMOS	2	Rail-to-Rail	10	10	1 pA	1 mV	6000	12	3	5.5	-40 to 105	8-MSOP
LMV342IDGKR	Texas Instruments	CMOS	2	Rail-to-Rail	1	1	1 pA	250 µV	107	113	2.5	5.5	-40 to 125	8-VSSOP
LMV342MM/NOPB	National Semiconductor	CMOS	2	Rail-to-Rail	1	1	0.02 pA	700 µV	107	113	2.7	5.5	-40 to 125	8-VSSOP
LMV358IPW	Texas Instruments	General Purpose	2	Rail-to-Rail	1	1	15 nA	1.7 mV	210	40	2.7	5.5	-40 to 125	8-TSSOP
LMV358IPWR	Texas Instruments	General Purpose	2	Rail-to-Rail	1	1	15 nA	1.7 mV	210	40	2.7	5.5	-40 to 125	8-TSSOP

Engineering Selection Recommendations

For Direct Functional Replacement:

The LMV358IPW and LMV358IPWR represent the closest functional equivalents to the LMX358IST. Both maintain general-purpose amplifier classification, dual-circuit configuration, and full -40°C to 125°C operating temperature range. These parts are suitable for applications where the LMX358IST reaches end-of-life status. The LMV358IPWR is recommended for new designs due to its active product status, whereas LMV358IPW carries a Last Time Buy designation.

For Low-Power Applications:

The AD8542ARUZ offers superior input bias current performance (4 pA versus 27 nA) and reduced supply current consumption (45 µA versus 130 µA), making it suitable for battery-powered or energy-constrained applications. This part maintains the full operating temperature range and rail-to-rail output capability.

For Ultra-Low-Power Designs:

The BU7266FVM-TR and BU7266SFVM-TR deliver exceptional power efficiency with supply current of 0.7 µA. These parts are appropriate for applications prioritizing minimal power consumption over bandwidth performance. The BU7266SFVM-TR extends the operating temperature to 105°C compared to 85°C for the standard variant.

For High-Speed Applications:

The BU7486FVM-TR provides significantly enhanced slew rate (10 V/µs) and gain-bandwidth product (10 MHz), suitable for applications requiring faster signal processing. This part operates across -40°C to 105°C and maintains the dual-circuit, rail-to-rail configuration.

For Precision Applications:

The LMV342IDGKR and LMV342MM/NOPB offer improved input offset voltage specifications (250 µV and 700 µV respectively) compared to the LMX358IST (4 mV), providing enhanced precision for instrumentation and measurement applications. Both maintain full temperature range operation.

All substitute parts comply with ROHS3 standards and maintain MSL 1 rating, ensuring compatibility with standard manufacturing processes and long-term storage requirements.

Frequently Asked Questions (FAQ)

Q: Can the AD8542ARUZ directly replace the LMX358IST in existing designs?

A: The AD8542ARUZ maintains functional equivalence through dual-circuit configuration, rail-to-rail output, and identical operating temperature range. However, the package format differs (8-TSSOP versus 8-MiniSO), requiring PCB layout modification. Electrical characteristics are compatible for most applications, with improved input bias current performance.

Q: What is the primary difference between the BU7242FVM-TR and BU7266FVM-TR?

A: Both parts are CMOS dual-circuit amplifiers in 8-MSOP packages. The BU7242FVM-TR provides moderate performance with 0.4 V/µs slew rate and 900 kHz bandwidth, consuming 180 µA supply current. The BU7266FVM-TR is optimized for ultra-low-power applications with 0.7 µA supply current but significantly reduced slew rate (0.0024 V/µs) and bandwidth (4 kHz). Selection depends on application speed requirements versus power budget constraints.

Q: Are the LMV358IPW and LMV358IPWR interchangeable?

A: Both parts are functionally identical with matching electrical specifications and operating temperature range. The primary difference is product status: LMV358IPW is designated Last Time Buy, while LMV358IPWR is in active production. For new designs, LMV358IPWR is recommended. Both use 8-TSSOP packaging and are suitable for direct substitution of the LMX358IST with PCB layout modifications.

Q: What packaging considerations apply when substituting the LMX358IST?

A: The LMX358IST uses 8-MiniSO packaging (0.118" width). Substitute parts employ 8-TSSOP (0.173" width), 8-MSOP (0.110" width), or 8-VSSOP formats. These package variations require PCB footprint redesign and may affect board layout density. Pin configurations remain compatible across all 8-pin dual-circuit amplifier packages.

Q: Which substitute part offers the best balance of performance and power consumption?

A: The LMV342IDGKR provides balanced performance with 1 V/µs slew rate, 1 MHz bandwidth, and 107 µA supply current. This part maintains full -40°C to 125°C temperature range and offers improved input offset voltage (250 µV) compared to the LMX358IST. It represents a suitable choice for general-purpose applications where neither ultra-low-power nor high-speed performance is the primary constraint.

Q: Can the BU7486FVM-TR be used in applications originally designed for the LMX358IST?

A: The BU7486FVM-TR is suitable only for applications where the enhanced performance characteristics (10 V/µs slew rate, 10 MHz bandwidth) do not introduce stability or noise concerns. The significantly higher supply current (6 mA versus 130 µA) and minimum supply voltage requirement (3 V versus 2.3 V) must be verified against application power budgets and supply specifications. The 8-MSOP package requires PCB layout modification.

Q: What compliance certifications apply to all substitute parts?

A: All substitute parts listed maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with standard manufacturing processes and storage requirements. REACH status is unaffected for all parts, and all carry EAR99 export classification.

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