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LMX324IDT Equivalent & Substitute Parts
Part Overview
The LMX324IDT is a general-purpose operational amplifier manufactured by STMicroelectronics, featuring four independent circuits in a 14-SOIC surface-mount package. This rail-to-rail amplifier operates across a supply voltage range of 2.3 V to 5.5 V and maintains performance across the industrial temperature range of -40°C to 125°C. The device is classified as Active product status with full RoHS3 compliance and unlimited moisture sensitivity rating.
Substitute parts are necessary when the LMX324IDT becomes unavailable due to supply constraints, end-of-life status, or when alternative packaging formats are required for manufacturing processes. The following equivalent devices maintain functional compatibility while offering variations in electrical performance characteristics and packaging options.
Substiute Parts
Key Parameters
| Parameter | LMX324IDT | Unit |
|---|---|---|
| Amplifier Type | General Purpose | — |
| Number of Circuits | 4 | — |
| 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 (x4 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 |
| Package / Case | 14-SOIC (0.154", 3.90mm Width) | — |
| Mounting Type | Surface Mount | — |
| RoHS Status | ROHS3 Compliant | — |
| Moisture Sensitivity Level | 1 (Unlimited) | — |
Substitute Part Grouping Explanation
Substitution compatibility for the LMX324IDT is determined by the following critical parameters:
Mandatory Compatibility Criteria:
- Four independent amplifier circuits
- Rail-to-rail output configuration
- Surface-mount package format (14-SOIC or equivalent 14-pin SOP)
- Operating temperature range minimum of -40°C
- Supply voltage span encompassing 2.3 V minimum and 5.5 V maximum
- RoHS3 compliance and unlimited moisture sensitivity rating
Performance Variation Parameters: Substitute parts may exhibit different electrical characteristics including slew rate, gain bandwidth product, input bias current, input offset voltage, supply current, and output current per channel. These variations determine suitability for specific application requirements but do not prevent functional substitution in general-purpose amplifier circuits.
Packaging Considerations: The LMX324IDT is supplied in Tape & Reel (TR) format. Substitute parts available in Cut Tape (CT) & Digi-Reel® or Tube packaging formats are electrically equivalent but require verification of manufacturing process compatibility.
Parameter Comparison
| Part Number | Manufacturer | Amplifier Type | Circuits | Slew Rate (V/µs) | GBW (MHz) | Input Bias (nA/pA) | Input Offset (mV/µV) | Supply Current (µA/mA) | Output Current (mA) | Supply Min (V) | Supply Max (V) | Temp Range (°C) | Package | Packaging Format |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| LMX324IDT | STMicroelectronics | General Purpose | 4 | 0.7 | 1.3 | 27 nA | 4 mV | 130 µA | 70 | 2.3 | 5.5 | -40 to 125 | 14-SOIC | Tape & Reel |
| AD8694ARZ | Analog Devices Inc. | General Purpose | 4 | 5 | 10 | 1 pA | 400 µV | 950 µA | 80 | 2.7 | 6 | -40 to 125 | 14-SOIC | Tube |
| AD8694ARZ-REEL7 | Analog Devices Inc. | General Purpose | 4 | 5 | 10 | 1 pA | 400 µV | 950 µA | 80 | 2.7 | 6 | -40 to 125 | 14-SOIC | Cut Tape & Digi-Reel |
| ADA4891-4ARZ | Analog Devices Inc. | CMOS | 4 | 210 | 105 | 2 pA | 2.5 mV | 4.4 mA | 125 | 2.7 | 5.5 | -40 to 125 | 14-SOIC | Tube |
| ADA4891-4ARZ-R7 | Analog Devices Inc. | CMOS | 4 | 210 | 105 | 2 pA | 2.5 mV | 4.4 mA | 125 | 2.7 | 5.5 | -40 to 125 | 14-SOIC | Cut Tape & Digi-Reel |
| BU7244F-E2 | Rohm Semiconductor | CMOS | 4 | 0.4 | 0.9 | 1 pA | 1 mV | 360 µA | 12 | 1.8 | 5.5 | -40 to 85 | 14-SOP | Cut Tape & Digi-Reel |
| BU7487F-E2 | Rohm Semiconductor | CMOS | 4 | 10 | 10 | 1 pA | 1 mV | 6 mA | 12 | 3 | 5.5 | -40 to 105 | 14-SOP | Cut Tape & Digi-Reel |
| LMR934F-GE2 | Rohm Semiconductor | General Purpose | 4 | 0.35 | 1.4 | 5 nA | 1 mV | 250 µA | 90 | 1.8 | 5 | -40 to 85 | 14-SOP | Cut Tape & Digi-Reel |
| LMV324BG-13 | Diodes Incorporated | General Purpose | 4 | 1 | 1 | 15 nA | 1.7 mV | 340 µA | 90 | 2.7 | 5.5 | -40 to 125 | 14-SOIC | Cut Tape & Digi-Reel |
| LMV324ID | Texas Instruments | General Purpose | 4 | 1 | 1 | 15 nA | 1.7 mV | 410 µA | 40 | 2.7 | 5.5 | -40 to 125 | 14-SOIC | Tube |
| LMV324IDR | UMW | Voltage Feedback | 4 | — | 1 | 10 pA | 800 µV | 45 µA | 25 | 2.1 | 5.5 | -25 to 85 | 14-SOIC | Cut Tape & Digi-Reel |
Engineering Selection Recommendations
Primary Substitutes (Highest Compatibility):
The LMV324BG-13 (Diodes Incorporated) and LMV324ID (Texas Instruments) are the closest functional equivalents to the LMX324IDT. Both devices maintain identical circuit count, output configuration, and package format (14-SOIC). The LMV324BG-13 is available in Cut Tape & Digi-Reel format with active product status and full RoHS3 compliance. The LMV324ID carries Last Time Buy status, indicating limited future availability.
Alternative Performance Profiles:
The AD8694ARZ and AD8694ARZ-REEL7 (Analog Devices Inc.) provide enhanced electrical performance with 10 MHz gain bandwidth product and superior slew rate characteristics. These devices maintain full temperature range coverage (-40°C to 125°C) and RoHS3 compliance. The AD8694ARZ-REEL7 variant offers Cut Tape & Digi-Reel packaging suitable for high-volume manufacturing processes.
The ADA4891-4ARZ and ADA4891-4ARZ-R7 (Analog Devices Inc.) represent high-performance CMOS alternatives with 105 MHz gain bandwidth product and 210 V/µs slew rate. These devices are suitable for applications requiring significantly higher bandwidth and faster transient response.
Lower-Performance Alternatives:
The BU7244F-E2 (Rohm Semiconductor) operates with reduced bandwidth (900 kHz) and lower output current capability (12 mA per channel). This device is suitable for power-constrained applications but exhibits reduced maximum operating temperature (85°C).
The LMR934F-GE2 (Rohm Semiconductor) provides comparable gain bandwidth product (1.4 MHz) with lower supply current (250 µA) but operates only to 85°C maximum temperature.
Limited Compatibility:
The LMV324IDR (UMW) exhibits reduced operating temperature range (-25°C to 85°C), which does not meet the full industrial temperature specification of the LMX324IDT. This device is suitable only for applications with restricted temperature requirements.
Compliance Status:
All substitute parts maintain RoHS3 compliance and REACH unaffected status. Moisture sensitivity levels are uniformly rated at MSL 1 (Unlimited) except for LMV324BG-13, which carries MSL 3 (168 Hours) rating.
Frequently Asked Questions (FAQ)
Q: Can the AD8694ARZ directly replace the LMX324IDT in existing circuit designs?
A: The AD8694ARZ is electrically compatible as a four-circuit rail-to-rail amplifier in 14-SOIC package. However, the higher slew rate (5 V/µs versus 0.7 V/µs) and gain bandwidth product (10 MHz versus 1.3 MHz) may affect circuit stability in designs optimized for the LMX324IDT's lower bandwidth characteristics. Circuit simulation or bench testing is necessary to confirm performance in specific applications.
Q: What is the difference between AD8694ARZ and AD8694ARZ-REEL7?
A: Both devices are electrically identical. The primary difference is packaging format: AD8694ARZ is supplied in Tube format, while AD8694ARZ-REEL7 is supplied in Cut Tape & Digi-Reel® format. Selection depends on manufacturing process requirements and tape-and-reel compatibility with automated assembly equipment.
Q: Why does the LMV324IDR have a reduced operating temperature range?
A: The LMV324IDR is specified for -25°C to 85°C operation, which does not encompass the full industrial temperature range (-40°C to 125°C) of the LMX324IDT. This device is unsuitable for applications requiring extended temperature coverage.
Q: Are the Rohm Semiconductor alternatives (BU7244F-E2, BU7487F-E2, LMR934F-GE2) suitable for all LMX324IDT applications?
A: The Rohm devices are functionally compatible as four-circuit rail-to-rail amplifiers but exhibit reduced maximum operating temperature (85°C or 105°C versus 125°C). The BU7244F-E2 and LMR934F-GE2 also feature significantly lower output current capability per channel. These devices are suitable only for applications with temperature and current requirements within their specified limits.
Q: What packaging formats are available for LMX324IDT substitutes?
A: Substitute parts are available in three packaging formats: Tube (AD8694ARZ, ADA4891-4ARZ, LMV324ID), Cut Tape & Digi-Reel® (AD8694ARZ-REEL7, ADA4891-4ARZ-R7, BU7244F-E2, BU7487F-E2, LMR934F-GE2, LMV324BG-13, LMV324IDR), and Tape & Reel (LMX324IDT). Manufacturing process compatibility with existing assembly equipment determines appropriate format selection.
Q: Which substitute offers the lowest power consumption?
A: The LMV324IDR exhibits the lowest supply current at 45 µA total for four channels. However, this device has reduced operating temperature range (-25°C to 85°C) and lower output current capability (25 mA per channel), limiting its applicability to power-constrained, temperature-limited applications.
Q: Are all substitute parts RoHS3 compliant?
A: All listed substitute parts maintain RoHS3 compliance. Moisture sensitivity levels are uniformly MSL 1 (Unlimited) except for LMV324BG-13, which carries MSL 3 (168 Hours) rating. This difference may affect storage and handling requirements in manufacturing environments.
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