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LM324KDR Equivalent & Substitute Parts
Part Overview
The LM324KDR is a general-purpose operational amplifier integrated circuit manufactured by Rohm Semiconductor, configured as a 4-circuit device in a 14-SOIC surface mount package. This part is classified as obsolete, which necessitates identification of equivalent and substitute components for ongoing design support and procurement continuity. The LM324KDR 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 | Unit |
|---|---|---|
| Amplifier Type | General Purpose | — |
| Number of Circuits | 4 | — |
| Slew Rate | 0.3 | V/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 to 85 | °C |
| Package / Case | 14-SOIC (0.154", 3.90mm Width) | — |
| RoHS Status | ROHS3 Compliant | — |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | — |
Substitute Part Grouping Explanation
Substitution of the LM324KDR is determined by strict alignment of electrical and mechanical parameters. The critical substitution criteria are:
Electrical Parameters:
- Gain Bandwidth Product: 1.2 MHz (fixed across all LM324 variants)
- Number of Circuits: 4 (mandatory for direct substitution)
- Input Bias Current: 20 nA (consistent across all variants)
- Supply Voltage Range: Minimum 3V, Maximum 30V or higher
- Output Current per Channel: 30 mA or greater
- Operating Temperature Range: Must encompass or match -40°C to 85°C
Mechanical Parameters:
- Package Type: 14-SOIC surface mount configuration
- Pin Count: 14 pins
- Package Width: 0.154" (3.90mm)
Compliance Parameters:
- RoHS3 Compliance: Required
- Moisture Sensitivity Level: MSL 1 (Unlimited)
Parts are classified into two categories: Direct Substitutes (identical output type, single-ended) and Similar Parts (differential output type, different functional configuration). Direct substitutes maintain functional equivalence for applications requiring single-ended output amplifiers. Similar parts with differential output represent architectural variations suitable only for designs specifically requiring differential output configurations.
Parameter Comparison
| Part Number | Manufacturer | Product Status | Slew Rate (V/µs) | Input Offset (mV) | Supply Current (mA) | Output Current (mA) | Max Supply (V) | Temp Range (°C) | Output Type |
|---|---|---|---|---|---|---|---|---|---|
| LM324KDR | Rohm Semiconductor | Obsolete | 0.3 | 1 | 1 | 30 | 32 | -40 to 85 | Single-Ended |
| LM324DR | Rohm Semiconductor | Obsolete | 0.3 | 1 | 1 | 30 | 32 | -40 to 85 | Single-Ended |
| LM324DRG3 | Texas Instruments | Last Time Buy | 0.5 | 3 | 1.4 | 30 | 30 | 0 to 70 | Single-Ended |
| LM324D | STMicroelectronics | Active | 0.4 | 2 | 1.5 | 40 | 30 | 0 to 70 | Single-Ended |
| LM324DG4 | Texas Instruments | Last Time Buy | 0.5 | 3 | 1.4 | 40 | 30 | 0 to 70 | Single-Ended |
| LM124D | STMicroelectronics | Obsolete | 0.4 | 2 | 1.5 | 30 | 30 | -55 to 125 | Differential |
| LM124DG4 | Texas Instruments | Last Time Buy | 0.5 | 3 | 1.4 | 30 | 30 | -55 to 125 | Differential |
| LM124DR | Texas Instruments | Active | 0.5 | 3 | 1.4 | 30 | 30 | -55 to 125 | Differential |
| LM124DRG4 | Texas Instruments | Discontinued at DiGi Electronics | 0.5 | 3 | 1.4 | 30 | 30 | -55 to 125 | Differential |
| LM124DT | STMicroelectronics | Active | 0.4 | 2 | 1.5 | 40 | 30 | -55 to 125 | Differential |
Engineering Selection Recommendations
Direct Substitutes (Recommended Priority Order):
-
LM324D (STMicroelectronics) — Active product status provides long-term availability and supply chain stability. Meets all electrical parameter requirements with enhanced output current capability (40 mA vs. 30 mA). Operating temperature range 0°C to 70°C is suitable for commercial and industrial applications. RoHS3 compliant with MSL 1 rating.
-
LM324DG4 (Texas Instruments) — Active product status with Last Time Buy designation indicates mature lifecycle. Provides enhanced output current (40 mA) and improved slew rate (0.5 V/µs). Temperature range 0°C to 70°C. RoHS3 compliant with MSL 1 rating. Suitable for applications not requiring extended low-temperature operation below 0°C.
-
LM324DR (Rohm Semiconductor) — Identical electrical specifications to LM324KDR with higher inventory availability (345,100 units). Maintains obsolete status but offers immediate procurement. Identical temperature range (-40°C to 85°C) and maximum supply voltage (32V). Direct functional replacement.
-
LM324DRG3 (Texas Instruments) — Last Time Buy status with 10,400 units in stock. Improved slew rate (0.5 V/µs) and higher input offset voltage (3 mV). Maximum supply voltage reduced to 30V. Temperature range 0°C to 70°C. Suitable for applications not requiring extended temperature operation.
Similar Parts (Differential Output Configuration):
The LM124 series variants (LM124D, LM124DG4, LM124DR, LM124DRG4, LM124DT) feature differential output configuration and are suitable only for designs specifically requiring differential amplifier output. These parts are not direct functional replacements for single-ended output applications. Selection among LM124 variants follows the same priority logic based on product status and availability.
Compliance and Certification:
All substitute parts maintain RoHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with modern manufacturing and storage requirements. REACH status remains unaffected across all variants. ECCN classification (EAR99) and HTSUS code (8542.33.0001) are consistent across all parts.
Frequently Asked Questions (FAQ)
Q: Can LM324D directly replace LM324KDR in existing designs?
A: LM324D is electrically compatible with LM324KDR for applications operating within the 0°C to 70°C temperature range. Both devices feature 4 circuits, 1.2 MHz gain bandwidth product, 20 nA input bias current, and 14-SOIC packaging. The primary difference is operating temperature range; LM324KDR supports -40°C to 85°C while LM324D supports 0°C to 70°C. Verify application temperature requirements before substitution.
Q: What is the difference between LM324 and LM124 series parts?
A: LM324 series devices feature single-ended output configuration, while LM124 series devices feature differential output configuration. These represent different functional architectures. LM124 parts are not direct substitutes for LM324 applications unless the design specifically requires differential output amplification. Verify circuit schematic requirements before selecting LM124 variants.
Q: Why does LM324D have higher output current (40 mA) than LM324KDR (30 mA)?
A: Output current capability is a manufacturing parameter that varies by device variant and manufacturer. LM324D from STMicroelectronics provides 40 mA per channel, exceeding the 30 mA specification of LM324KDR. This enhanced capability is compatible with designs requiring 30 mA or less and provides additional design margin.
Q: Are all substitute parts RoHS3 compliant?
A: Yes. All substitute parts listed maintain RoHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating. This ensures compatibility with modern manufacturing processes and environmental regulations.
Q: What is the significance of "Last Time Buy" product status?
A: Last Time Buy status indicates the manufacturer has announced end-of-life for the product. Existing inventory remains available for purchase, but no future production is planned. Parts with Last Time Buy status (LM324DRG3, LM324DG4, LM124DG4, LM124DRG4) should be evaluated for long-term supply chain planning. Active status parts (LM324D, LM124DR, LM124DT) provide indefinite availability.
Q: Can I use LM324DRG3 instead of LM324KDR if my application operates at 0°C to 70°C?
A: Yes, LM324DRG3 is compatible for applications within the 0°C to 70°C temperature range. Both devices feature identical 1.2 MHz gain bandwidth product, 20 nA input bias current, and 14-SOIC packaging. LM324DRG3 provides improved slew rate (0.5 V/µs vs. 0.3 V/µs) and higher input offset voltage (3 mV vs. 1 mV). Maximum supply voltage is 30V instead of 32V; verify this meets application requirements.
Q: What packaging considerations apply to these substitutes?
A: All substitute parts use 14-SOIC surface mount packaging with 0.154" (3.90mm) width, maintaining mechanical compatibility with LM324KDR. Supplier device package designations vary (14-SOPJ, 14-SOIC, 14-SO) but refer to the same physical 14-pin SOIC form factor. Verify PCB footprint compatibility with component placement equipment specifications.
Q: Is LM324DR a better choice than LM324KDR?
A: LM324DR from Rohm Semiconductor is electrically identical to LM324KDR with identical specifications and temperature range (-40°C to 85°C). The primary advantage is significantly higher inventory availability (345,100 units vs. 2,000 units). Both parts maintain obsolete status. LM324DR provides immediate procurement advantage while maintaining complete functional equivalence.
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