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LM324ADG Equivalent & Substitute Parts
Part Overview
The LM324ADG is a general-purpose operational amplifier featuring four independent circuits in a 14-SOIC surface-mount package. Manufactured by onsemi, this device is classified as obsolete, necessitating identification of equivalent and substitute components for ongoing design requirements and production continuity. The LM324ADG operates across a wide supply voltage range of 3V to 32V with a 1 MHz gain-bandwidth product, making it suitable for general analog signal processing applications. Due to its obsolete status, direct replacements and functionally equivalent alternatives are required for new designs and inventory replenishment.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | LM324ADG |
| Manufacturer | onsemi |
| Category | Linear, Amplifiers |
| Amplifier Type | General Purpose |
| Number of Circuits | 4 |
| Package / Case | 14-SOIC (0.154", 3.90mm Width) |
| Gain Bandwidth Product | 1 MHz |
| Current - Input Bias | 40 nA |
| Voltage - Input Offset | 2 mV |
| Current - Supply | 1.5 mA (x4 Channels) |
| Current - Output / Channel | 40 mA |
| Voltage - Supply Span (Min) | 3 V |
| Voltage - Supply Span (Max) | 32 V |
| Operating Temperature | 0°C ~ 70°C |
| Mounting Type | Surface Mount |
| Product Status | Obsolete |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution of the LM324ADG is determined by strict alignment of electrical and mechanical parameters. The primary substitution criteria are:
Critical Parameters for Direct Substitution:
- Number of circuits: 4 independent amplifier channels
- Package type: 14-SOIC surface-mount configuration with 0.154" (3.90mm) width
- Gain-bandwidth product: 1 MHz nominal
- Supply voltage range: Minimum 3V, maximum 30V or higher
- Input bias current: 40 nA or lower
- Voltage input offset: 2 mV or lower
- Output current per channel: 40 mA or higher
- Supply current: 1.5 mA per channel or lower
- Operating temperature range: 0°C to 70°C minimum
Direct Substitutes maintain identical electrical specifications and package configuration, enabling pin-for-pin replacement without circuit modification.
Upgrade Substitutes provide enhanced performance characteristics (extended temperature range, improved slew rate, higher gain-bandwidth product) while maintaining mechanical and electrical compatibility within the specified parameter envelope.
Similar Alternatives offer different amplifier topologies (J-FET input stages) with superior performance metrics but require verification of application-specific requirements due to different input bias current characteristics and supply voltage minimums.
Parameter Comparison
| Parameter | LM324ADG (Main) | LM324AMX/NOPB | LM324AWDT | LM224ADT | AD8684ARZ | ADA4000-4ARZ | ADA4004-4ARZ |
|---|---|---|---|---|---|---|---|
| Manufacturer | onsemi | Texas Instruments | STMicroelectronics | STMicroelectronics | Analog Devices Inc. | Analog Devices Inc. | Analog Devices Inc. |
| Product Status | Obsolete | Active | Active | Active | Active | Active | Active |
| Amplifier Type | General Purpose | General Purpose | General Purpose | General Purpose | J-FET | J-FET | General Purpose |
| Number of Circuits | 4 | 4 | 4 | 4 | 4 | 4 | 4 |
| Package / Case | 14-SOIC | 14-SOIC | 14-SOIC | 14-SOIC | 14-SOIC | 14-SOIC | 14-SOIC |
| Gain Bandwidth Product | 1 MHz | 1 MHz | 1.3 MHz | 1.3 MHz | 3.5 MHz | 5 MHz | 12 MHz |
| Slew Rate | — | — | 0.4 V/µs | 0.4 V/µs | 9 V/µs | 20 V/µs | 2.7 V/µs |
| Current - Input Bias | 40 nA | 45 nA | 20 nA | 20 nA | 6 pA | 5 pA | 40 nA |
| Voltage - Input Offset | 2 mV | 2 mV | 2 mV | 2 mV | 350 µV | 200 µV | 40 µV |
| Current - Supply | 1.5 mA | 1.5 mA | 1.5 mA | 1.5 mA | 210 µA | 1.35 mA | — |
| Current - Output / Channel | 40 mA | 40 mA | 40 mA | 40 mA | 12 mA | 28 mA | 10 mA |
| Voltage - Supply Span (Min) | 3 V | 3 V | 3 V | 3 V | 9 V | 8 V | 10 V |
| Voltage - Supply Span (Max) | 32 V | 32 V | 30 V | 30 V | 36 V | 36 V | 30 V |
| Operating Temperature | 0°C ~ 70°C | 0°C ~ 70°C | 0°C ~ 70°C | -40°C ~ 105°C | -40°C ~ 85°C | -40°C ~ 125°C | -40°C ~ 125°C |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
| RoHS Status | — | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 3 (168 Hours) |
Engineering Selection Recommendations
Direct Substitutes (Pin-Compatible Replacement)
LM324AMX/NOPB (Texas Instruments) and LM324AWDT (STMicroelectronics) are direct electrical and mechanical equivalents to the LM324ADG. Both devices maintain the 14-SOIC package configuration, four-circuit topology, and core electrical specifications. LM324AMX/NOPB is classified as Active with ROHS3 compliance and LinCMOS™ series designation, offering superior inventory availability (36,756 units). LM324AWDT is also Active with ROHS3 compliance and provides marginally improved input bias current (20 nA versus 40 nA) and higher gain-bandwidth product (1.3 MHz versus 1 MHz).
Upgrade Substitute (Extended Temperature Range)
LM224ADT (STMicroelectronics) provides an upgrade path with extended operating temperature range (-40°C to 105°C) compared to the LM324ADG (0°C to 70°C). This device maintains identical electrical specifications and 14-SOIC packaging while offering improved slew rate (0.4 V/µs) and higher gain-bandwidth product (1.3 MHz). Product status is Active with ROHS3 compliance and substantial inventory availability (34,870 units).
Performance-Enhanced Alternatives
AD8684ARZ (Analog Devices Inc.) represents a J-FET input topology alternative with significantly improved input bias current (6 pA versus 40 nA) and higher gain-bandwidth product (3.5 MHz). This device requires minimum supply voltage of 9V and maximum output current of 12 mA per channel, necessitating application-specific verification. Product status is Active with ROHS3 compliance.
ADA4000-4ARZ (Analog Devices Inc.) offers J-FET input topology with superior slew rate (20 V/µs), gain-bandwidth product (5 MHz), and extended operating temperature range (-40°C to 125°C). Minimum supply voltage requirement is 8V with output current of 28 mA per channel. Product status is Active with ROHS3 compliance.
ADA4004-4ARZ (Analog Devices Inc.) provides general-purpose topology with highest gain-bandwidth product (12 MHz) and lowest input offset voltage (40 µV). This device requires minimum supply voltage of 10V and offers output current of 10 mA per channel. Product status is Active with ROHS3 compliance and iPolar® series designation. Moisture sensitivity level is MSL 3 (168 Hours).
Frequently Asked Questions (FAQ)
Q: Can LM324AMX/NOPB be used as a direct replacement for LM324ADG without circuit modification?
A: Yes. LM324AMX/NOPB maintains identical pin configuration, package type (14-SOIC), and electrical specifications within the specified parameter envelope. No circuit modification is required for direct substitution.
Q: What is the primary difference between LM324AWDT and LM224ADT?
A: LM224ADT provides extended operating temperature range (-40°C to 105°C) compared to LM324AWDT (0°C to 70°C). Both devices share identical electrical specifications and 14-SOIC packaging. Selection depends on application temperature requirements.
Q: Why do AD8684ARZ and ADA4000-4ARZ require minimum supply voltages of 9V and 8V respectively?
A: These devices employ J-FET input stages, which require higher minimum supply voltages than the bipolar input stages used in general-purpose LM324 variants. Applications operating below these voltage thresholds cannot use these alternatives.
Q: Can ADA4004-4ARZ be used in applications requiring 3V supply operation?
A: No. ADA4004-4ARZ requires minimum supply voltage of 10V. Applications requiring 3V operation must use LM324ADG equivalents (LM324AMX/NOPB, LM324AWDT, or LM224ADT).
Q: What is the significance of MSL 3 (168 Hours) for ADA4004-4ARZ?
A: MSL 3 indicates higher moisture sensitivity compared to MSL 1 (Unlimited) devices. ADA4004-4ARZ requires baking and controlled moisture exposure during storage and handling. Standard MSL 1 devices (LM324 variants) have no moisture sensitivity restrictions.
Q: How does input bias current affect circuit design when substituting LM324ADG with AD8684ARZ?
A: AD8684ARZ exhibits input bias current of 6 pA compared to LM324ADG at 40 nA. This 6,667-fold reduction minimizes input bias current errors in high-impedance circuits. Applications with input impedances below 1 MΩ experience negligible impact; high-impedance applications benefit from reduced offset drift.
Q: Are all substitute parts ROHS3 compliant?
A: All substitute parts listed are ROHS3 compliant except the main part (LM324ADG), which does not specify RoHS status. All alternatives meet current environmental compliance requirements.
Q: What packaging options are available for LM324 equivalents?
A: LM324AMX/NOPB is available in Cut Tape (CT) and Digi-Reel® packaging. LM324AWDT and LM224ADT are available in Tape & Reel (TR) and Cut Tape (CT) & Digi-Reel® configurations respectively. AD8684ARZ variants and ADA4000/ADA4004 series offer Tube and Tape & Reel options. Selection depends on production volume and assembly requirements.
Q: Can LM324 variants be used interchangeably in audio amplifier applications?
A: LM324 general-purpose variants are suitable for audio applications within their specified bandwidth limitations (1 MHz to 1.3 MHz). Higher-performance alternatives (AD8684ARZ at 3.5 MHz, ADA4000-4ARZ at 5 MHz, ADA4004-4ARZ at 12 MHz) provide improved audio fidelity through extended bandwidth and reduced distortion. Selection depends on audio frequency range and fidelity requirements.
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