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LM324KD Equivalent & Substitute Parts
Part Overview
The LM324KD is a general-purpose operational amplifier integrated circuit manufactured by Texas Instruments, configured as a 4-circuit device in 14-SOIC surface mount packaging. This part is classified as obsolete, with 877 units currently in stock. The LM324KD operates across a wide supply voltage range of 3V to 30V and is suitable for general-purpose amplification applications requiring moderate bandwidth and low input bias current. Due to its obsolete status, equivalent and substitute parts are necessary for ongoing design support, production continuity, and long-term component availability.
Substiute Parts
Key Parameters
| Parameter | LM324KD Value | Unit |
|---|---|---|
| Amplifier Type | General Purpose | — |
| Number of Circuits | 4 | — |
| Slew Rate | 0.5 | V/µs |
| Gain Bandwidth Product | 1.2 | MHz |
| Current - Input Bias | 20 | nA |
| Voltage - Input Offset | 3 | mV |
| Current - Supply (x4 Channels) | 1.4 | mA |
| Current - Output / Channel | 30 | mA |
| Voltage - Supply Span (Min) | 3 | V |
| Voltage - Supply Span (Max) | 30 | V |
| Operating Temperature | 0 to 70 | °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
Substitute parts for the LM324KD are grouped based on strict compatibility with the following critical parameters: 4-circuit general-purpose amplifier configuration, 14-SOIC surface mount package, supply voltage range compatibility (minimum 3V, maximum ≥30V), and RoHS3 compliance. The substitution logic prioritizes parts that maintain electrical performance within the specified operating envelope while accommodating variations in slew rate, gain bandwidth product, input bias current, and supply current that remain functionally acceptable for general-purpose amplification circuits.
Key Parameters Determining Substitution:
- Number of Circuits: 4
- Package Type: 14-SOIC surface mount
- Voltage Supply Range: Minimum 3V, Maximum ≥30V
- Amplifier Type: General Purpose
- RoHS3 Compliance: Required
- Mounting Type: Surface Mount
Parameter Comparison
| Parameter | LM324KD | LM2902DR | LM324AM/NOPB | LM324AMX/NOPB | LM324M/NOPB | LM324MX/NOPB | LP324M/NOPB | LP324MX/NOPB | BA10324AF-E2 | BA2902F-E2 | BA2902SF-E2 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Manufacturer | Texas Instruments | Rohm Semiconductor | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Rohm Semiconductor | Rohm Semiconductor | Rohm Semiconductor |
| Number of Circuits | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 |
| Slew Rate (V/µs) | 0.5 | 0.3 | — | — | — | — | 0.05 | 0.05 | 0.2 | 0.2 | 0.2 |
| Gain Bandwidth Product (MHz) | 1.2 | 1.2 | 1 | 1 | 1 | 1 | 0.1 | 0.1 | 0.5 | 0.5 | 0.5 |
| Current - Input Bias (nA) | 20 | 20 | 45 | 45 | 45 | 45 | 2 | 2 | 20 | 20 | 20 |
| Voltage - Input Offset (mV) | 3 | 1 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 |
| Current - Supply (mA) | 1.4 | 1 | 1.5 | 1.5 | 1.5 | 1.5 | 0.085 | 0.085 | 0.6 | 0.7 | 0.7 |
| Current - Output / Channel (mA) | 30 | 30 | 40 | 40 | 40 | 40 | 10 | 10 | 35 | 30 | 30 |
| Voltage - Supply Span (Min) | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 |
| Voltage - Supply Span (Max) | 30 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 32 |
| Operating Temperature (°C) | 0 to 70 | -40 to 125 | 0 to 70 | 0 to 70 | 0 to 70 | 0 to 70 | 0 to 70 | 0 to 70 | -40 to 85 | -40 to 125 | -40 to 105 |
| Package / Case | 14-SOIC (0.154", 3.90mm) | 14-SOPJ | 14-SOIC (0.154", 3.90mm) | 14-SOIC (0.154", 3.90mm) | 14-SOIC (0.154", 3.90mm) | 14-SOIC (0.154", 3.90mm) | 14-SOIC (0.154", 3.90mm) | 14-SOIC (0.154", 3.90mm) | 14-SOP (0.173", 4.40mm) | 14-SOP (0.173", 4.40mm) | 14-SOP (0.173", 4.40mm) |
| Product Status | Obsolete | Obsolete | Active | Active | Active | Active | Active | Active | Active | Active | Active |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
Engineering Selection Recommendations
Primary Substitutes (Active Status, Identical Package):
LM324AM/NOPB, LM324AMX/NOPB, LM324M/NOPB, and LM324MX/NOPB are direct substitutes manufactured by Texas Instruments in active production status. These parts maintain the 14-SOIC (0.154", 3.90mm) package footprint, 4-circuit configuration, and supply voltage range compatibility (3V to 32V). All are RoHS3 compliant with MSL 1 rating. The primary difference is increased output current capability (40 mA per channel versus 30 mA) and slightly higher input bias current (45 nA versus 20 nA), which remain within acceptable tolerances for general-purpose amplification. These parts are recommended for direct replacement in new designs and production continuity.
Secondary Substitutes (Active Status, Alternative Package):
BA10324AF-E2 and BA2902F-E2 are manufactured by Rohm Semiconductor in active production status. These parts employ a 14-SOP package (0.173", 4.40mm width) instead of the standard 14-SOIC, requiring PCB layout verification for pin-to-pin compatibility. Both maintain 4-circuit configuration, 3V to 32V supply range, and RoHS3 compliance. BA10324AF-E2 operates to -40°C to 85°C and BA2902F-E2 to -40°C to 125°C, providing extended temperature range options. These substitutes are suitable when package footprint differences are accommodated in design.
Low-Power Alternative:
LP324M/NOPB and LP324MX/NOPB are Texas Instruments parts in active production with significantly reduced supply current (85 µA versus 1.4 mA) and lower output current capability (10 mA per channel). These are suitable only for applications where bandwidth and output drive requirements are reduced. Selection requires verification that the 100 kHz gain bandwidth product and 10 mA output current are sufficient for the intended circuit function.
Compatibility Constraints:
All substitute parts maintain RoHS3 compliance and MSL 1 moisture sensitivity rating. Supply voltage range compatibility is confirmed for all substitutes at minimum 3V and maximum ≥30V. Package differences between 14-SOIC and 14-SOP variants require PCB layout verification. Operating temperature ranges vary; applications requiring 0°C to 70°C operation are supported by all substitutes, while extended temperature operation requires selection of parts rated to the required range.
Frequently Asked Questions (FAQ)
Q: Can LM324AMX/NOPB directly replace LM324KD without PCB modification?
A: Yes. LM324AMX/NOPB is pin-compatible with LM324KD, using the identical 14-SOIC (0.154", 3.90mm) package. No PCB layout changes are required. The part is in active production status and RoHS3 compliant.
Q: What is the primary difference between LM324KD and LM324AM/NOPB?
A: LM324KD is obsolete; LM324AM/NOPB is active production. LM324AM/NOPB has higher output current capability (40 mA per channel versus 30 mA) and slightly higher input bias current (45 nA versus 20 nA). Supply voltage range is expanded to 32V maximum. Both maintain 4-circuit configuration and 14-SOIC packaging.
Q: Can BA10324AF-E2 be used as a substitute without PCB changes?
A: BA10324AF-E2 requires PCB layout verification. While pin-compatible electrically, the package is 14-SOP (0.173", 4.40mm width) versus 14-SOIC (0.154", 3.90mm). Physical footprint differences may require PCB redesign. Electrical performance is compatible for general-purpose amplification.
Q: Why do LP324M/NOPB and LP324MX/NOPB have lower supply current?
A: LP324 series parts are optimized for low-power operation, with 100 kHz gain bandwidth product and 85 µA supply current. These are suitable only for applications where reduced bandwidth and lower output drive (10 mA per channel) are acceptable. Verify circuit requirements before selection.
Q: Are all substitute parts RoHS3 compliant?
A: Yes. All substitute parts listed are RoHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, matching the compliance profile of LM324KD.
Q: What is the temperature range difference between substitutes?
A: LM324KD and most LM324 variants operate 0°C to 70°C. BA10324AF-E2 extends to -40°C to 85°C. BA2902F-E2 and BA2902SF-E2 extend to -40°C to 125°C and -40°C to 105°C respectively. Select based on application temperature requirements.
Q: Can LM2902DR replace LM324KD?
A: LM2902DR is electrically compatible (4-circuit, 1.2 MHz bandwidth, 20 nA input bias) but uses 14-SOPJ package instead of 14-SOIC. Package footprint differences require PCB verification. LM2902DR is obsolete status. Active production alternatives are preferred.
Q: What packaging options are available for substitutes?
A: Substitutes are available in 14-SOIC (0.154", 3.90mm) and 14-SOP (0.173", 4.40mm) packages. Packaging variants include Tube, Cut Tape (CT) & Digi-Reel®, and Tape & Reel (TR). Verify packaging requirements for production processes.
Q: Is input bias current difference between LM324KD (20 nA) and LM324AM/NOPB (45 nA) significant?
A: For general-purpose amplification, the 25 nA difference is typically acceptable. Applications with high-impedance input sources or precision transimpedance circuits should verify that 45 nA bias current meets circuit specifications before substitution.
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