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LM324DR Equivalent & Substitute Parts
Part Overview
The LM324DR is a general-purpose operational amplifier integrated circuit manufactured by Rohm Semiconductor, featuring four independent amplifier circuits in a 14-SOIC surface mount package. This device is classified as obsolete, which necessitates identification of equivalent and substitute components for ongoing design support and procurement continuity. The LM324DR operates across a wide supply voltage range of 3V to 32V and maintains performance across industrial temperature ranges from -40°C to 85°C, making it suitable for diverse analog signal processing applications.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer | Rohm Semiconductor |
| Part Number | LM324DR |
| Category | Linear, Amplifiers |
| Amplifier Type | General Purpose |
| Number of Circuits | 4 |
| Package / Case | 14-SOIC (0.154", 3.90mm Width) |
| Mounting Type | Surface Mount |
| Slew Rate | 0.3V/µs |
| Gain Bandwidth Product | 1.2 MHz |
| Current - Input Bias | 20 nA |
| Voltage - Input Offset | 1 mV |
| Current - Supply | 1 mA |
| Current - Output / Channel | 30 mA |
| Voltage - Supply Span (Min) | 3 V |
| Voltage - Supply Span (Max) | 32 V |
| Operating Temperature | -40°C ~ 85°C |
| Product Status | Obsolete |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution of the LM324DR is determined by strict adherence to the following electrical and mechanical parameters:
Critical Substitution Parameters:
- Number of circuits: 4 independent amplifier channels
- Package type: 14-SOIC surface mount configuration with 0.154" (3.90mm) width
- Gain bandwidth product: 1.2 MHz minimum
- Input bias current: 20 nA maximum
- Supply voltage range: Minimum 3V, maximum 30V or higher
- Output current per channel: 30 mA or greater
- RoHS3 compliance and MSL Level 1 rating
Direct Substitutes maintain identical electrical specifications and package footprint compatibility, differing only in manufacturer, product status, or packaging format (tube, tape & reel, or cut tape).
Similar Parts share the same base product family (LM124 series) but feature differential output configuration rather than standard output, resulting in different functional characteristics and application suitability.
Parameter Comparison
| Parameter | LM324DR (Rohm) | LM324D (STMicroelectronics) | LM324DG4 (Texas Instruments) | LM324DRG3 (Texas Instruments) | LM324KDR (Rohm) |
|---|---|---|---|---|---|
| Manufacturer | Rohm Semiconductor | STMicroelectronics | Texas Instruments | Texas Instruments | Rohm Semiconductor |
| Product Status | Obsolete | Active | Last Time Buy | Last Time Buy | Obsolete |
| Packaging | Tube | Tube | Tube | Tape & Reel (TR) | Tube |
| Number of Circuits | 4 | 4 | 4 | 4 | 4 |
| Package / Case | 14-SOIC | 14-SOIC | 14-SOIC | 14-SOIC | 14-SOIC |
| Slew Rate | 0.3V/µs | 0.4V/µs | 0.5V/µs | 0.5V/µs | 0.3V/µs |
| Gain Bandwidth Product | 1.2 MHz | 1.2 MHz | 1.2 MHz | 1.2 MHz | 1.2 MHz |
| Current - Input Bias | 20 nA | 20 nA | 20 nA | 20 nA | 20 nA |
| Voltage - Input Offset | 1 mV | 2 mV | 3 mV | 3 mV | 1 mV |
| Current - Supply | 1 mA | 1.5 mA | 1.4 mA | 1.4 mA | 1 mA |
| Current - Output / Channel | 30 mA | 40 mA | 40 mA | 30 mA | 30 mA |
| Voltage - Supply Span (Min) | 3 V | 3 V | 3 V | 3 V | 3 V |
| Voltage - Supply Span (Max) | 32 V | 30 V | 30 V | 30 V | 32 V |
| Operating Temperature | -40°C ~ 85°C | 0°C ~ 70°C | 0°C ~ 70°C | 0°C ~ 70°C | -40°C ~ 85°C |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) |
Engineering Selection Recommendations
Direct Substitutes - Active Product Status:
The LM324D manufactured by STMicroelectronics is the primary recommended substitute for the obsolete LM324DR. This device maintains full electrical and mechanical compatibility with identical gain bandwidth product (1.2 MHz), input bias current (20 nA), and 14-SOIC package configuration. The LM324D carries active product status, ensuring long-term availability and supply chain continuity. All RoHS3 compliance and MSL Level 1 certifications are maintained. The operating temperature range is restricted to 0°C to 70°C compared to the original -40°C to 85°C specification; applications requiring extended temperature operation must account for this limitation.
Direct Substitutes - Last Time Buy Status:
The LM324DG4 and LM324DRG3 from Texas Instruments provide functional equivalence with identical package footprint and electrical core specifications. Both devices are designated as Last Time Buy, indicating limited future availability. The LM324DG4 is supplied in tube packaging, while the LM324DRG3 is supplied in tape & reel format. These devices feature marginally improved slew rate (0.5V/µs versus 0.3V/µs) and higher output current capability (40 mA versus 30 mA per channel). Operating temperature range is restricted to 0°C to 70°C. Selection of these parts should account for their discontinued status and plan accordingly for long-term supply requirements.
Obsolete Direct Substitute:
The LM324KDR from Rohm Semiconductor is electrically identical to the LM324DR but carries obsolete product status. This part shares the same manufacturer as the original component and maintains the extended operating temperature range (-40°C to 85°C) and maximum supply voltage (32V). Procurement of this device is not recommended due to its obsolete classification and limited inventory availability.
Similar Parts - Differential Output Configuration:
The LM124 series devices (LM124D, LM124DG4, LM124DR, LM124DRG4, LM124DT) are not direct substitutes. These components feature differential output configuration rather than standard output, fundamentally altering their functional characteristics and application suitability. The LM124 series is suitable only for applications specifically designed for differential output amplifier operation. The LM124DR from Texas Instruments carries active product status and offers extended operating temperature range (-55°C to 125°C), making it appropriate for applications requiring both differential output and wide temperature operation.
Frequently Asked Questions (FAQ)
Q: Can the LM324D from STMicroelectronics be used as a direct replacement for the LM324DR?
A: Yes, the LM324D is a direct electrical and mechanical substitute. Both devices feature four independent general-purpose amplifier circuits in 14-SOIC packages with identical gain bandwidth product (1.2 MHz) and input bias current (20 nA). The LM324D carries active product status, ensuring continued availability. The primary consideration is the restricted operating temperature range (0°C to 70°C versus -40°C to 85°C); applications operating outside this range require verification of performance requirements.
Q: What is the difference between the LM324DG4 and LM324DRG3?
A: Both devices are manufactured by Texas Instruments and provide identical electrical specifications with 1.2 MHz gain bandwidth product and 20 nA input bias current. The primary difference is packaging format: LM324DG4 is supplied in tube packaging, while LM324DRG3 is supplied in tape & reel format. Both are designated Last Time Buy status. Selection between these parts depends on assembly process requirements and packaging compatibility with automated equipment.
Q: Why are the LM124 series devices listed as similar rather than direct substitutes?
A: The LM124 series features differential output configuration, whereas the LM324 series features standard output configuration. This fundamental functional difference means the LM124 devices are not interchangeable with the LM324DR without circuit redesign. The LM124 series is suitable only for applications specifically designed for differential output amplifier operation.
Q: What are the key parameters that determine substitution compatibility?
A: Substitution compatibility is determined by: four independent amplifier circuits, 14-SOIC surface mount package with 0.154" width, 1.2 MHz gain bandwidth product, 20 nA input bias current, 3V minimum supply voltage, 30 mA or greater output current per channel, and RoHS3 compliance with MSL Level 1 rating. Deviations in any of these parameters indicate the device is not a direct substitute.
Q: Can I use the LM324DG4 in applications requiring -40°C to 85°C operation?
A: No. The LM324DG4 is specified for 0°C to 70°C operation only. Applications requiring extended temperature operation must use the LM324KDR (Rohm) or LM324DR (Rohm), both of which maintain -40°C to 85°C specifications. However, the LM324KDR carries obsolete status, limiting its practical availability.
Q: What is the significance of Last Time Buy status for the LM324DG4 and LM324DRG3?
A: Last Time Buy designation indicates that the manufacturer has announced discontinuation of the product. These devices remain available for a limited period, after which they will no longer be manufactured or supplied. Designs utilizing these components should plan for transition to active-status alternatives such as the LM324D (STMicroelectronics) to ensure long-term supply continuity.
Q: Are there any compliance or certification differences between the substitute parts?
A: All listed substitute parts maintain RoHS3 compliance and MSL Level 1 (Unlimited) moisture sensitivity rating, matching the original LM324DR specifications. No compliance or certification differences exist among the direct substitute devices.
Q: What packaging options are available for LM324 direct substitutes?
A: Direct substitutes are available in three packaging formats: tube (LM324D, LM324DG4, LM324KDR), tape & reel (LM324DRG3), and cut tape with Digi-Reel (available through specific distributors). Selection depends on assembly process requirements and volume considerations. All packaging formats maintain identical electrical specifications and 14-SOIC footprint compatibility.
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