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LMX358IDT Equivalent & Substitute Parts
Part Overview
The LMX358IDT is a general-purpose operational amplifier manufactured by STMicroelectronics, featuring dual circuits in an 8-SOIC surface-mount package. This device operates as a rail-to-rail output amplifier with a supply voltage range of 2.3 V to 5.5 V and is rated for temperatures from -40°C to 125°C. The part is currently in active production status with ROHS3 compliance and unlimited moisture sensitivity rating.
Substitute parts are identified when equivalent functional performance can be achieved within the same package footprint and electrical operating parameters. Alternative components may be required due to inventory availability, specific performance requirements, or design optimization needs.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Amplifier Type | General Purpose | — |
| Number of Circuits | 2 | — |
| Output Type | Rail-to-Rail | — |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) | — |
| Slew Rate | 0.7 | V/µs |
| Gain Bandwidth Product | 1.3 | MHz |
| Current - Input Bias | 27 | nA |
| Voltage - Input Offset | 4 | mV |
| Current - Supply | 130 | µA (x2 Channels) |
| 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 | — |
| RoHS Status | ROHS3 Compliant | — |
| Moisture Sensitivity Level | 1 (Unlimited) | — |
Substitute Part Grouping Explanation
Substitution of the LMX358IDT is determined by the following critical parameters:
Package Compatibility: All substitute parts must use the 8-SOIC surface-mount package with 0.154" (3.90mm) width to ensure direct PCB footprint compatibility.
Electrical Operating Range: Substitute parts must support the minimum supply voltage of 2.3 V and maximum supply voltage of 5.5 V. Parts with narrower supply ranges or lower minimum voltages may not function in all intended applications.
Circuit Configuration: The dual-circuit (2-channel) configuration is mandatory for direct substitution. Single-channel amplifiers are not equivalent.
Output Architecture: Rail-to-rail output capability is a core functional requirement for the LMX358IDT and must be maintained in substitute parts.
Temperature Rating: Operating temperature range of -40°C to 125°C is required for applications within the specified industrial temperature band.
Compliance Standards: All substitute parts must maintain ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1) to meet regulatory and manufacturing requirements.
Substitute parts are grouped into two categories based on amplifier type: general-purpose amplifiers (AD8542ARZ, AD8692 series) and CMOS amplifiers (ADA4891 series, Rohm BU7242F-E2, BU7266 series). Performance characteristics such as slew rate, gain bandwidth product, and supply current vary across substitutes and determine suitability for specific circuit applications.
Parameter Comparison
| Part Number | Manufacturer | Amplifier Type | Slew Rate (V/µs) | GBW (MHz) | Input Bias (pA/nA) | Input Offset (mV/µV) | Supply Current (µA/mA) | Output Current (mA) | Supply Min (V) | Supply Max (V) | Temp Range (°C) | Package |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| LMX358IDT | STMicroelectronics | General Purpose | 0.7 | 1.3 | 27 nA | 4 mV | 130 µA | 70 | 2.3 | 5.5 | -40 to 125 | 8-SOIC |
| AD8542ARZ | Analog Devices Inc. | General Purpose | 0.92 | 1 | 4 pA | 1 mV | 45 µA | 30 | 2.7 | 5.5 | -40 to 125 | 8-SOIC |
| AD8692ARZ | Analog Devices Inc. | General Purpose | 5 | 10 | 1 pA | 0.4 mV | 950 µA | 80 | 2.7 | 6 | -40 to 125 | 8-SOIC |
| AD8692ARZ-REEL | Analog Devices Inc. | General Purpose | 5 | 10 | 1 pA | 0.4 mV | 950 µA | 80 | 2.7 | 6 | -40 to 125 | 8-SOIC |
| AD8692ARZ-REEL7 | Analog Devices Inc. | General Purpose | 5 | 10 | 1 pA | 0.4 mV | 950 µA | 80 | 2.7 | 6 | -40 to 125 | 8-SOIC |
| ADA4891-2ARZ | Analog Devices Inc. | CMOS | 210 | 105 | 2 pA | 2.5 mV | 4.4 mA | 125 | 2.7 | 5.5 | -40 to 125 | 8-SOIC |
| ADA4891-2ARZ-R7 | Analog Devices Inc. | CMOS | 210 | 105 | 2 pA | 2.5 mV | 4.4 mA | 125 | 2.7 | 5.5 | -40 to 125 | 8-SOIC |
| ADA4891-2ARZ-RL | Analog Devices Inc. | CMOS | 210 | 105 | 2 pA | 2.5 mV | 4.4 mA | 125 | 2.7 | 5.5 | -40 to 125 | 8-SOIC |
| BU7242F-E2 | Rohm Semiconductor | CMOS | 0.4 | 0.9 | 1 pA | 1 mV | 180 µA | 12 | 1.8 | 5.5 | -40 to 85 | 8-SOP |
| BU7266F-E2 | Rohm Semiconductor | CMOS | 0.0024 | 0.004 | 1 pA | 1 mV | 0.7 µA | 4 | 1.8 | 5.5 | -40 to 85 | 8-SOP |
| BU7266SF-E2 | Rohm Semiconductor | CMOS | 0.0024 | 0.004 | 1 pA | 1 mV | 0.7 µA | 4 | 1.8 | 5.5 | -40 to 105 | 8-SOP |
Engineering Selection Recommendations
Direct Substitution (Identical Electrical Performance):
The AD8542ARZ provides the closest functional match to the LMX358IDT within the same 8-SOIC package. Both devices operate across the -40°C to 125°C temperature range and maintain ROHS3 compliance. The AD8542ARZ operates at a minimum supply voltage of 2.7 V, which is 0.4 V higher than the LMX358IDT minimum. Applications requiring operation below 2.7 V cannot use this substitute.
Enhanced Performance Substitutes:
The AD8692 series (AD8692ARZ, AD8692ARZ-REEL, AD8692ARZ-REEL7) offers significantly higher slew rate (5 V/µs versus 0.7 V/µs) and gain bandwidth product (10 MHz versus 1.3 MHz). These devices are suitable for applications requiring faster signal processing. Supply current increases to 950 µA, which may impact power budget in battery-powered designs. All variants maintain the required temperature range and ROHS3 compliance.
High-Speed CMOS Alternatives:
The ADA4891-2 series (ADA4891-2ARZ, ADA4891-2ARZ-R7, ADA4891-2ARZ-RL) delivers extreme performance with 210 V/µs slew rate and 105 MHz gain bandwidth product. These CMOS amplifiers are appropriate for high-frequency signal conditioning and fast transient applications. Supply current consumption increases to 4.4 mA. All variants support the full -40°C to 125°C operating range and maintain ROHS3 compliance.
Low-Power Alternatives:
The Rohm BU7242F-E2 operates with 180 µA supply current and supports extended supply voltage range down to 1.8 V. However, this device is rated only to 85°C maximum, limiting use in high-temperature applications. The 8-SOP package differs slightly in width (4.40mm versus 3.90mm), requiring PCB layout verification.
Ultra-Low-Power Options:
The BU7266 series (BU7266F-E2, BU7266SF-E2) consumes only 0.7 µA supply current, making these devices suitable for battery-powered and energy-harvesting applications. These parts operate at extremely low bandwidth (4 kHz) and slew rate (0.0024 V/µs), restricting use to low-frequency signal processing. Maximum operating temperature is 85°C for BU7266F-E2 and 105°C for BU7266SF-E2. The 8-SOP package requires PCB footprint verification.
Packaging Considerations:
The LMX358IDT is supplied in Tape & Reel (TR) packaging. Substitute parts are available in Tube, Cut Tape (CT) & Digi-Reel®, and Tape & Reel formats. Packaging selection affects component handling and assembly processes but does not alter electrical performance.
Frequently Asked Questions (FAQ)
Q: Can the AD8542ARZ directly replace the LMX358IDT in all applications?
A: The AD8542ARZ is electrically compatible in applications where the minimum supply voltage requirement of 2.7 V is acceptable. The LMX358IDT operates at 2.3 V minimum, so designs requiring operation below 2.7 V cannot use the AD8542ARZ. Both devices share identical package footprint, temperature range, and compliance certifications.
Q: What is the primary difference between general-purpose and CMOS amplifier substitutes?
A: General-purpose amplifiers (AD8542ARZ, AD8692 series) and CMOS amplifiers (ADA4891 series) differ in input bias current, slew rate, and power consumption. CMOS amplifiers exhibit lower input bias current (2 pA versus 27 nA) and higher slew rates (210 V/µs versus 0.7 V/µs) but consume significantly more supply current (4.4 mA versus 130 µA). Selection depends on circuit requirements for speed, power consumption, and input impedance.
Q: Are the Rohm BU7242F-E2 and BU7266 series suitable replacements for the LMX358IDT?
A: The Rohm devices are not direct replacements. The BU7242F-E2 and BU7266 series use 8-SOP packaging with 4.40mm width, compared to the LMX358IDT 8-SOIC package with 3.90mm width. PCB footprint compatibility must be verified. Additionally, the Rohm devices are rated to maximum 85°C or 105°C, below the LMX358IDT 125°C rating, restricting use in high-temperature applications.
Q: Which substitute offers the best power efficiency for battery-powered applications?
A: The BU7266 series provides the lowest supply current at 0.7 µA, making it optimal for battery-powered designs. However, this device operates at only 4 kHz bandwidth and 0.0024 V/µs slew rate, suitable only for low-frequency signal processing. For applications requiring higher bandwidth with reduced power consumption, the AD8542ARZ offers a compromise at 45 µA supply current.
Q: Can I use the AD8692ARZ-REEL in place of AD8692ARZ?
A: Yes. Both part numbers represent identical electrical devices with the same performance specifications. The difference is packaging format: AD8692ARZ is supplied in Tube, while AD8692ARZ-REEL and AD8692ARZ-REEL7 are supplied in Cut Tape & Digi-Reel® format. Electrical performance, temperature range, and compliance certifications are identical.
Q: What is the impact of using a substitute with higher slew rate than the LMX358IDT?
A: Higher slew rate (such as the 5 V/µs of AD8692 or 210 V/µs of ADA4891-2) enables faster signal transitions and improved transient response. This is beneficial for high-frequency applications but may introduce increased noise and power consumption. Circuit design must account for these characteristics through appropriate filtering and biasing.
Q: Are all substitute parts ROHS3 compliant?
A: Yes. All substitute parts listed maintain ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1), matching the LMX358IDT regulatory status. This ensures compatibility with manufacturing processes and environmental regulations.
Q: Which substitute has the lowest input offset voltage?
A: The AD8692 series exhibits the lowest input offset voltage at 0.4 mV, compared to the LMX358IDT at 4 mV. Lower input offset voltage reduces DC errors in precision analog circuits. The AD8542ARZ provides 1 mV offset voltage, offering a middle ground between the LMX358IDT and AD8692 series.
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