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LM324AM Equivalent & Substitute Parts
Part Overview
The LM324AM is a general-purpose operational amplifier integrated circuit containing four independent amplifier circuits in a 14-SOIC surface mount package. Manufactured by onsemi, this device operates across a supply voltage range of 3V to 32V and is designed for applications requiring low-power, general-purpose amplification. The LM324AM is classified as obsolete product status, making identification of active equivalent and substitute parts essential for ongoing design support and procurement continuity.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Manufacturer Part Number | LM324AM | — |
| Manufacturer | onsemi | — |
| Category | Linear, Amplifiers | — |
| Amplifier Type | General Purpose | — |
| Number of Circuits | 4 | — |
| Gain Bandwidth Product | 1 | MHz |
| Current - Input Bias | 40 | nA |
| Voltage - Input Offset | 1.5 | mV |
| Current - Supply | 1.5 | mA |
| Current - Output / Channel | 40 | mA |
| Voltage - Supply Span (Min) | 3 | V |
| Voltage - Supply Span (Max) | 32 | V |
| Operating Temperature | 0 to 70 | °C |
| Mounting Type | Surface Mount | — |
| Package / Case | 14-SOIC (0.154", 3.90mm Width) | — |
| Product Status | Obsolete | — |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | — |
Substitute Part Grouping Explanation
Substitution of the LM324AM is determined by strict alignment of electrical and mechanical parameters. The following criteria establish valid substitution relationships:
Primary Substitution Criteria:
- Number of Circuits: 4 (mandatory match)
- Package / Case: 14-SOIC (0.154", 3.90mm Width) (mandatory match)
- Mounting Type: Surface Mount (mandatory match)
- Gain Bandwidth Product: 1 MHz (mandatory match)
- Current - Output / Channel: 40 mA (mandatory match)
- Voltage - Supply Span: 3V to 32V minimum (mandatory match)
Secondary Compatibility Parameters:
- Current - Input Bias: 40 nA to 100 nA (acceptable range)
- Voltage - Input Offset: 0.5 mV to 2 mV (acceptable range)
- Operating Temperature: 0°C to 70°C minimum coverage required
Substitute parts are grouped into two categories: Direct Equivalents (identical base product number LM324) and Similar Alternatives (different base product numbers with compatible electrical specifications). All substitute parts listed maintain active product status and RoHS3 compliance, providing long-term availability and regulatory alignment.
Parameter Comparison
| Part Number | Manufacturer | Product Status | Gain Bandwidth Product (MHz) | Input Bias Current (nA) | Input Offset Voltage (mV) | Output Current / Channel (mA) | Supply Voltage Min (V) | Supply Voltage Max (V) | Operating Temperature (°C) | Package |
|---|---|---|---|---|---|---|---|---|---|---|
| LM324AM | onsemi | Obsolete | 1 | 40 | 1.5 | 40 | 3 | 32 | 0 to 70 | 14-SOIC |
| LM324ADR2G | onsemi | Active | 1 | 40 | 2 | 40 | 3 | 32 | 0 to 70 | 14-SOIC |
| LM224DR2G | onsemi | Active | 1 | 90 | 2 | 40 | 3 | 32 | -25 to 85 | 14-SOIC |
| LM2902DR2G | onsemi | Active | 1 | 90 | 2 | 40 | 3 | 32 | -40 to 105 | 14-SOIC |
| LM2902VDR2G | onsemi | Active | 1 | 90 | 2 | 40 | 3 | 32 | -40 to 125 | 14-SOIC |
| LM324DR2G | onsemi | Active | 1 | 90 | 2 | 40 | 3 | 32 | 0 to 70 | 14-SOIC |
| MC33074ADR2G | onsemi | Active | 4.5 | 100 | 0.5 | 30 | 3 | 44 | -40 to 85 | 14-SOIC |
| MC33074DR2G | onsemi | Active | 4.5 | 100 | 1 | 30 | 3 | 44 | -40 to 85 | 14-SOIC |
| MC34074ADR2G | onsemi | Active | 4.5 | 100 | 0.5 | 30 | 3 | 44 | 0 to 70 | 14-SOIC |
| MC34074DR2G | onsemi | Active | 4.5 | 100 | 1 | 30 | 3 | 44 | 0 to 70 | 14-SOIC |
| MC34074VDR2G | onsemi | Active | 4.5 | 100 | 1 | 30 | 3 | 44 | -40 to 125 | 14-SOIC |
Engineering Selection Recommendations
Direct Equivalent (Recommended Primary Substitutes):
LM324ADR2G is the direct active equivalent to LM324AM. This part maintains identical electrical specifications including 1 MHz gain bandwidth product, 40 mA output current per channel, and 3V to 32V supply voltage range. The LM324ADR2G is RoHS3 compliant and carries active product status, ensuring long-term availability and regulatory alignment. The only parameter variance is input offset voltage (2 mV versus 1.5 mV), which remains within acceptable tolerance for general-purpose amplifier applications.
LM324DR2G provides an alternative direct equivalent with identical operating temperature range (0°C to 70°C) and electrical performance. This part is available in Cut Tape and Digi-Reel packaging formats.
Extended Temperature Range Alternatives:
LM224DR2G and LM2902DR2G series parts offer expanded operating temperature ranges (-25°C to 85°C and -40°C to 105°C respectively) while maintaining core electrical specifications. These parts are suitable for applications requiring operation beyond the standard 0°C to 70°C range. Input bias current increases to 90 nA, which remains acceptable for general-purpose amplification circuits.
LM2902VDR2G extends the upper operating temperature to 125°C and is available in Tape & Reel packaging, supporting high-temperature applications.
Enhanced Performance Alternatives:
MC34074ADR2G and MC34074DR2G provide enhanced electrical performance with 4.5 MHz gain bandwidth product, improved input offset voltage (0.5 mV to 1 mV), and extended supply voltage range (3V to 44V). These parts operate within the 0°C to 70°C temperature range matching the LM324AM specification. Output current per channel is 30 mA, which is lower than the LM324AM but sufficient for many general-purpose applications.
MC34074VDR2G offers the same enhanced performance with extended temperature range (-40°C to 125°C) in Tape & Reel packaging.
All substitute parts maintain RoHS3 compliance, MSL Level 1 (Unlimited), and REACH Unaffected status, ensuring regulatory compliance and environmental compatibility.
Frequently Asked Questions (FAQ)
Q: Can LM324ADR2G directly replace LM324AM in existing designs?
A: Yes. LM324ADR2G is the direct active equivalent with matching electrical specifications and package format. The input offset voltage difference (2 mV versus 1.5 mV) is within acceptable tolerance for general-purpose amplifier circuits. Both parts operate across 3V to 32V supply voltage and maintain identical gain bandwidth product (1 MHz) and output current capability (40 mA per channel).
Q: What is the difference between LM324DR2G and LM324ADR2G?
A: Both parts are direct equivalents of LM324AM with identical electrical specifications. The primary difference is packaging format: LM324ADR2G is supplied in Cut Tape and Digi-Reel formats, while LM324DR2G is also available in Cut Tape and Digi-Reel. Both maintain active product status and RoHS3 compliance.
Q: When should I use MC34074 series parts instead of LM324 equivalents?
A: MC34074 series parts (MC34074ADR2G, MC34074DR2G, MC34074VDR2G) are suitable when applications require enhanced performance characteristics: 4.5 MHz gain bandwidth product (versus 1 MHz), improved input offset voltage (0.5 to 1 mV), and extended supply voltage range (3V to 44V). However, output current per channel is reduced to 30 mA. These parts are appropriate for precision signal conditioning and higher-frequency applications.
Q: Are all substitute parts RoHS3 compliant?
A: Yes. All active substitute parts listed (LM324ADR2G, LM224DR2G, LM2902DR2G, LM2902VDR2G, LM324DR2G, MC33074ADR2G, MC33074DR2G, MC34074ADR2G, MC34074DR2G, MC34074VDR2G) are RoHS3 compliant and REACH Unaffected, meeting current environmental and regulatory requirements.
Q: What is the significance of the temperature range variants?
A: Temperature range variants determine operational limits. LM324AM and LM324ADR2G operate 0°C to 70°C. LM224DR2G extends to -25°C to 85°C. LM2902DR2G and LM2902VDR2G extend to -40°C to 105°C and -40°C to 125°C respectively. Selection depends on application environment. Extended range parts are necessary for industrial, automotive, or high-temperature applications.
Q: Can I use LM2902 series parts as direct replacements?
A: LM2902 series parts (LM2902DR2G, LM2902VDR2G) are functionally compatible with LM324AM for general-purpose amplification. Both maintain 1 MHz gain bandwidth product, 40 mA output current per channel, and 3V to 32V supply voltage range. Input bias current increases to 90 nA (versus 40 nA), which is acceptable for most applications. LM2902 series offers extended temperature range capability.
Q: What packaging options are available for substitute parts?
A: Substitute parts are available in two packaging formats: Cut Tape (CT) & Digi-Reel and Tape & Reel (TR). All parts maintain identical 14-SOIC (0.154", 3.90mm Width) package format. Packaging selection depends on procurement and assembly requirements. Tape & Reel format is typical for high-volume automated assembly.
Q: Is the input offset voltage difference between LM324AM (1.5 mV) and substitutes (2 mV) significant?
A: The 0.5 mV difference is within acceptable tolerance for general-purpose amplifier applications. For precision circuits requiring offset voltage below 1 mV, MC34074 series parts (0.5 to 1 mV) are recommended. For standard signal conditioning and buffering applications, the 2 mV specification of LM324ADR2G and LM324DR2G is acceptable.
Q: Why is LM324AM classified as obsolete?
A: LM324AM is obsolete product status, meaning onsemi has discontinued active manufacturing and support. Active equivalent parts (LM324ADR2G, LM324DR2G) are available to support existing designs and new applications. Transition to active equivalents ensures long-term supply chain continuity and regulatory compliance.
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