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LMX358ASA Equivalent & Substitute Parts
Part Overview
The LMX358ASA is a general-purpose operational amplifier featuring dual circuits with rail-to-rail output capability in an 8-SOIC surface mount package. Manufactured by Analog Devices Inc./Maxim Integrated, this device is classified as obsolete product status. The LMX358ASA operates across a supply voltage range of 2.3 V to 7 V with a gain bandwidth product of 1.3 MHz and slew rate of 1 V/µs, making it suitable for low-power analog signal processing applications.
Due to its obsolete status, sourcing the LMX358ASA presents long-term supply chain risk. Active equivalent and substitute parts are available from multiple manufacturers with comparable or improved electrical characteristics, ensuring design continuity and future availability.
Substiute Parts
Key Parameters
| Parameter | LMX358ASA 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 | RoHS non-compliant | — |
Substitute Part Grouping Explanation
Substitution of the LMX358ASA is determined by the following critical parameters:
Functional Equivalence Criteria:
- Dual-channel general-purpose operational amplifier architecture
- Rail-to-rail output capability
- Surface mount packaging (8-SOIC or compatible footprint)
- Operating temperature range of -40°C to 125°C (or extended range)
- Supply voltage compatibility within or overlapping the 2.3 V to 7 V range
Electrical Performance Compatibility: Substitute parts must maintain comparable slew rate (≥0.4 V/µs), gain bandwidth product (≥900 kHz), and output current capability (≥12 mA per channel) to ensure functional replacement in existing circuit designs.
Compliance and Availability: Active product status and RoHS3 compliance are prioritized for long-term supply chain sustainability. Packaging variants (Tape & Reel, Cut Tape, Bulk) are interchangeable for the same base part number.
Parameter Comparison
| Part Number | Manufacturer | Amplifier Type | Slew Rate (V/µs) | GBW (MHz) | Input Bias (nA) | Supply Min (V) | Supply Max (V) | Temp Range (°C) | Package | Status |
|---|---|---|---|---|---|---|---|---|---|---|
| LMX358ASA | Analog Devices/Maxim | General Purpose | 1 | 1.3 | 18 | 2.3 | 7 | -40 to 125 | 8-SOIC | Obsolete |
| MAX4246AKA+T | Analog Devices/Maxim | General Purpose | 0.4 | 1 | 10 | 2.5 | 5.5 | -40 to 125 | SOT-23-8 | Active |
| AD8542ARZ | Analog Devices | General Purpose | 0.92 | 1 | 0.004 | 2.7 | 5.5 | -40 to 125 | 8-SOIC | Active |
| AD8542ARZ-REEL | Analog Devices | General Purpose | 0.92 | 1 | 0.004 | 2.7 | 5.5 | -40 to 125 | 8-SOIC | Active |
| AD8542ARZ-REEL7 | Analog Devices | General Purpose | 0.92 | 1 | 0.004 | 2.7 | 5.5 | -40 to 125 | 8-SOIC | Active |
| APX358SG-13 | Diodes Incorporated | General Purpose | 1 | 1 | 10 | 2.5 | 5.5 | -40 to 85 | 8-SOP | Active |
| AZV358MTR-E1 | Diodes Incorporated | General Purpose | 1 | 1 | 15 | 2.7 | 5.5 | -40 to 85 | 8-SOIC | Active |
| AZV358MTR-G1 | Diodes Incorporated | General Purpose | 1 | 1 | 15 | 2.7 | 5.5 | -40 to 85 | 8-SOIC | Active |
| BU7242F-E2 | Rohm Semiconductor | CMOS | 0.4 | 0.9 | 0.001 | 1.8 | 5.5 | -40 to 85 | 8-SOP | Active |
| BU7242SF-E2 | Rohm Semiconductor | CMOS | 0.4 | 0.9 | 0.001 | 1.8 | 5.5 | -40 to 105 | 8-SOP | Active |
| LMV342MA/NOPB | National Semiconductor | CMOS | 1 | 1 | 0.00002 | 2.7 | 5.5 | -40 to 125 | 8-SOIC | Active |
Engineering Selection Recommendations
Primary Recommendation: AD8542ARZ / AD8542ARZ-REEL / AD8542ARZ-REEL7
The AD8542 series from Analog Devices represents the closest functional equivalent to the LMX358ASA. All three variants maintain identical electrical specifications with 8-SOIC packaging, ensuring direct footprint compatibility. The AD8542 series is RoHS3 compliant and carries active product status with extensive inventory availability (33,700 to 37,241 units). Operating temperature range extends to -40°C to 125°C, matching the original specification. The primary trade-off is reduced supply voltage maximum (5.5 V versus 7 V), which is acceptable for most applications operating within standard 5 V logic levels.
Secondary Recommendation: AZV358MTR-E1 / AZV358MTR-G1
The AZV358 series from Diodes Incorporated provides 8-SOIC package compatibility with slew rate and gain bandwidth product matching the LMX358ASA (1 V/µs and 1 MHz respectively). Both variants are RoHS3 compliant and active products. Operating temperature range is limited to -40°C to 85°C, which restricts use in applications requiring the full 125°C upper limit. Supply voltage range (2.7 V to 5.5 V) is narrower than the original part.
Alternative Recommendation: LMV342MA/NOPB
The LMV342 from National Semiconductor offers superior electrical performance with exceptionally low input bias current (0.02 pA) and extended output current capability (113 mA per channel). This CMOS amplifier maintains 8-SOIC packaging and full -40°C to 125°C temperature range. RoHS3 compliance and active status ensure long-term availability. This option is suitable for applications requiring lower power consumption and higher output drive capability.
Package Variant Consideration: MAX4246AKA+T
The MAX4246 from Analog Devices provides an alternative in SOT-23-8 packaging, offering a smaller footprint for space-constrained designs. This part is RoHS3 compliant and active. However, SOT-23-8 requires PCB layout modification compared to 8-SOIC. Supply voltage range (2.5 V to 5.5 V) is narrower than the original specification.
CMOS Alternatives: BU7242F-E2 / BU7242SF-E2
The BU7242 series from Rohm Semiconductor provides CMOS amplifier architecture with ultra-low input bias current (1 pA) and extended supply voltage range down to 1.8 V. These parts are RoHS3 compliant and active. Operating temperature range is limited to -40°C to 85°C (or -40°C to 105°C for BU7242SF-E2). Gain bandwidth product (900 kHz) is slightly lower than the original specification.
Frequently Asked Questions (FAQ)
Q1: Can I directly replace LMX358ASA with AD8542ARZ without PCB modifications?
Yes. The AD8542ARZ maintains identical 8-SOIC (0.154", 3.90mm Width) packaging and pinout compatibility with the LMX358ASA. No PCB layout changes are required. Electrical performance is comparable across all critical parameters including slew rate, gain bandwidth product, and output current capability.
Q2: What is the primary limitation when substituting with AZV358MTR-E1 or AZV358MTR-G1?
The AZV358 series limits operating temperature to -40°C to 85°C, compared to the LMX358ASA specification of -40°C to 125°C. This restriction eliminates these options for applications requiring operation above 85°C. Supply voltage maximum is also reduced to 5.5 V from the original 7 V specification.
Q3: Why is the MAX4246AKA+T listed as a substitute if it uses SOT-23-8 packaging instead of 8-SOIC?
The MAX4246AKA+T provides functional equivalence in dual-channel general-purpose amplifier architecture with rail-to-rail output. However, SOT-23-8 packaging requires PCB footprint redesign compared to 8-SOIC. This option is suitable only for new designs or boards undergoing layout revision. Existing 8-SOIC designs should prioritize AD8542 or AZV358 variants.
Q4: What are the advantages of CMOS amplifiers like BU7242 or LMV342 over general-purpose alternatives?
CMOS amplifiers offer significantly lower input bias current (0.001 to 0.00002 pA versus 4 to 18 nA), reducing input offset drift and improving performance in high-impedance signal conditioning applications. LMV342 additionally provides higher output current capability (113 mA per channel versus 28 to 30 mA). These benefits come with trade-offs in slew rate and gain bandwidth product, which may be acceptable depending on application requirements.
Q5: Are all substitute parts RoHS3 compliant?
All recommended substitute parts carry RoHS3 compliance status. The original LMX358ASA is RoHS non-compliant, making migration to compliant alternatives necessary for applications subject to RoHS regulations or customer requirements.
Q6: What is the difference between AD8542ARZ, AD8542ARZ-REEL, and AD8542ARZ-REEL7?
These three variants are electrically identical with identical 8-SOIC packaging. The differences are packaging format only: AD8542ARZ is supplied in Tube, AD8542ARZ-REEL in Cut Tape & Digi-Reel, and AD8542ARZ-REEL7 in Cut Tape & Digi-Reel with alternative reel configuration. Selection depends on manufacturing process requirements (tube for manual assembly, tape & reel for automated pick-and-place).
Q7: Can I use LMV342MA/NOPB in applications requiring the full 7 V supply voltage range?
No. The LMV342MA/NOPB maximum supply voltage is 5.5 V, compared to the LMX358ASA specification of 7 V. This part is suitable only for applications operating within the 2.7 V to 5.5 V range. For designs requiring 7 V operation, AD8542 or AZV358 variants are more appropriate.
Q8: Which substitute part offers the best low-power performance?
The AD8542 series provides the lowest supply current at 45 µA (x2 channels), compared to 240 µA for the LMX358ASA. The BU7242 series offers comparable low-power operation at 180 µA total supply current. For ultra-low-power applications, the LMV342MA/NOPB at 107 µA (x2 channels) provides a middle ground with superior output current capability.
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