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LM248D Equivalent & Substitute Parts
Part Overview
The LM248D is a general-purpose operational amplifier integrated circuit manufactured by STMicroelectronics, configured as a 4-circuit device in a 14-SOIC surface mount package. This component is classified as obsolete, indicating discontinued production and limited availability for new designs. The LM248D operates across a wide temperature range of -40°C to 105°C and is suitable for applications requiring moderate slew rate and gain-bandwidth characteristics typical of general-purpose amplifier circuits.
Due to its obsolete status, identifying equivalent and substitute parts is necessary for design continuity, procurement alternatives, and long-term product support. Substitute parts must maintain functional compatibility through matching circuit count, package form factor, and electrical performance within acceptable operating parameters.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Amplifier Type | General Purpose | — |
| Number of Circuits | 4 | — |
| Package / Case | 14-SOIC (0.154", 3.90mm Width) | — |
| Slew Rate | 0.5 | V/µs |
| Gain Bandwidth Product | 1 | MHz |
| Current - Input Bias | 30 | nA |
| Voltage - Input Offset | 1 | mV |
| Current - Supply (x4 Channels) | 2.1 | mA |
| Current - Output / Channel | 25 | mA |
| Voltage - Supply Span | 44 | V |
| Operating Temperature | -40 to 105 | °C |
| Mounting Type | Surface Mount | — |
| RoHS Status | ROHS3 Compliant | — |
| Moisture Sensitivity Level | 1 (Unlimited) | — |
Substitute Part Grouping Explanation
Substitution of the LM248D is determined by the following critical parameters:
Primary Compatibility Criteria:
- Number of circuits: 4 (quad configuration required)
- Package form factor: 14-SOIC surface mount package
- Amplifier type: General purpose operational amplifier
- Mounting type: Surface mount
Secondary Performance Criteria:
- Slew rate: 0.5 V/µs or greater
- Gain bandwidth product: 1 MHz or greater
- Input bias current: 30 nA or lower
- Input offset voltage: 1 mV or lower
- Supply voltage span: Minimum 44 V or greater
- Output current per channel: 25 mA or greater
- Operating temperature range: Must encompass -40°C to 105°C or provide overlap
Compliance Requirements:
- RoHS3 compliance
- Moisture sensitivity level: 1 (Unlimited) preferred for equivalent substitution
Substitute parts are grouped into two categories: direct equivalents (matching all primary and secondary criteria) and functional alternatives (matching primary criteria with acceptable performance trade-offs in secondary parameters).
Parameter Comparison
| Parameter | LM248D | AS324AMTR-E1 | AS324AMTR-G1 | AS324MTR-E1 | AS324MTR-G1 | LF444CM/NOPB | LM124D | LM124DG4 | LM124DR | LM124DRG4 | LM224AD |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Manufacturer | STMicroelectronics | Diodes Inc. | Diodes Inc. | Diodes Inc. | Diodes Inc. | Texas Instruments | STMicroelectronics | Texas Instruments | Texas Instruments | Texas Instruments | STMicroelectronics |
| Amplifier Type | General Purpose | General Purpose | General Purpose | General Purpose | General Purpose | J-FET | General Purpose | General Purpose | General Purpose | General Purpose | General Purpose |
| Number of Circuits | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 |
| Package / Case | 14-SOIC | 14-SOIC | 14-SOIC | 14-SOIC | 14-SOIC | 14-SOIC | 14-SOIC | 14-SOIC | 14-SOIC | 14-SOIC | 14-SOIC |
| Slew Rate (V/µs) | 0.5 | — | — | — | — | 1 | 0.4 | 0.5 | 0.5 | 0.5 | 0.4 |
| Gain Bandwidth Product (MHz) | 1 | — | — | — | — | 1 | 1.2 | 1.2 | 1.2 | 1.2 | 1.2 |
| Current - Input Bias (nA) | 30 | 20 | 20 | 20 | 20 | 0.01 | 20 | 20 | 20 | 20 | 20 |
| Voltage - Input Offset (mV) | 1 | 2 | 2 | 2 | 2 | 3 | 2 | 3 | 3 | 3 | 2 |
| Current - Supply (mA) | 2.1 | 1 | 1 | 1 | 1 | 0.6 | 1.5 | 1.4 | 1.4 | 1.4 | 1.5 |
| Current - Output / Channel (mA) | 25 | 40 | 40 | 40 | 40 | 14 | 30 | 30 | 30 | 30 | 30 |
| Voltage - Supply Span (V) | 44 | 3–36 | 3–36 | 3–36 | 3–36 | 36 | 3–30 | 3–30 | 3–30 | 3–30 | 3–30 |
| Operating Temperature (°C) | -40 to 105 | -40 to 85 | -40 to 85 | -40 to 85 | -40 to 85 | 0 to 70 | -55 to 125 | -55 to 125 | -55 to 125 | -55 to 125 | -40 to 105 |
| Product Status | Obsolete | Active | Active | Active | Active | Active | Obsolete | Last Time Buy | Active | Discontinued | Obsolete |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| Moisture Sensitivity Level | 1 | 1 | 3 | 3 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
Engineering Selection Recommendations
Tier 1: Direct Equivalents (Preferred for Replacement)
The AS324MTR-G1 (Diodes Incorporated) represents the most suitable direct replacement for the LM248D. This part maintains quad general-purpose amplifier configuration in 14-SOIC packaging with active product status and unlimited moisture sensitivity rating. While the operating temperature range (-40°C to 85°C) does not extend to the upper limit of the original part (105°C), it covers the minimum specification. The supply voltage span (3–36 V) is narrower than the LM248D (44 V), requiring verification that application requirements do not exceed 36 V. Output current capability (40 mA per channel) exceeds the original specification (25 mA), providing improved performance margin.
The AS324AMTR-E1 and AS324MTR-E1 offer equivalent electrical performance to AS324MTR-G1 with higher inventory availability. Both maintain active product status and RoHS3 compliance. The AS324AMTR-E1 features unlimited moisture sensitivity (MSL 1), while AS324MTR-E1 specifies MSL 3 (168 hours), which may require controlled storage conditions.
Tier 2: Functional Alternatives (Extended Temperature Range)
The LM124DR (Texas Instruments) provides extended operating temperature range (-55°C to 125°C), encompassing and exceeding the LM248D specification. This part maintains quad general-purpose configuration in 14-SOIC packaging with active product status. The supply voltage span (3–30 V) is narrower than the LM248D, requiring application verification. Slew rate (0.5 V/µs) and gain bandwidth product (1.2 MHz) meet or exceed original specifications. Current supply (1.4 mA) is lower than the LM248D (2.1 mA), reducing power consumption. Output current per channel (30 mA) exceeds the original specification.
The LM124DG4 (Texas Instruments) offers identical electrical specifications to LM124DR with last-time-buy product status, indicating limited future availability.
Tier 3: Specialized Alternatives (J-FET Technology)
The LF444CM/NOPB (Texas Instruments) represents a J-FET operational amplifier alternative with superior input bias current (10 pA versus 30 nA) and higher slew rate (1 V/µs). This part is suitable for applications requiring extremely low input bias current. The operating temperature range (0°C to 70°C) is narrower than the LM248D, restricting use in extended temperature applications. Output current per channel (14 mA) is lower than the original specification (25 mA).
Tier 4: Obsolete Alternatives (Not Recommended for New Designs)
The LM124D and LM224AD are classified as obsolete, similar to the LM248D. While these parts maintain functional compatibility, their obsolete status limits procurement viability and should not be selected for new designs.
Compliance Summary:
All recommended substitute parts maintain RoHS3 compliance and REACH unaffected status, matching the original LM248D certification profile. Moisture sensitivity levels are acceptable for standard handling and storage conditions.
Frequently Asked Questions (FAQ)
Q: Can the AS324MTR-G1 directly replace the LM248D without circuit modification?
A: The AS324MTR-G1 is functionally compatible with the LM248D for most general-purpose amplifier applications. Both devices are quad operational amplifiers in 14-SOIC packaging with matching pin configurations. However, two design parameters require verification: (1) the supply voltage span of AS324MTR-G1 is 3–36 V, which is narrower than the LM248D specification of 44 V; (2) the operating temperature range of AS324MTR-G1 is -40°C to 85°C, which does not extend to 105°C. If your application operates within these narrower specifications, no circuit modification is required.
Q: What is the difference between AS324AMTR-E1, AS324AMTR-G1, AS324MTR-E1, and AS324MTR-G1?
A: All four parts are quad general-purpose operational amplifiers from Diodes Incorporated with identical electrical specifications. The differences are: (1) packaging designation: AMTR indicates automotive-grade qualification, MTR indicates standard industrial grade; (2) moisture sensitivity level: AMTR-E1 and MTR-G1 specify MSL 1 (unlimited), while AMTR-G1 and MTR-E1 specify MSL 3 (168 hours); (3) inventory availability varies significantly. For standard industrial applications, AS324MTR-G1 is recommended due to active status, unlimited moisture sensitivity, and highest inventory availability.
Q: Why does the LM124DR have a higher gain bandwidth product (1.2 MHz) than the LM248D (1 MHz)?
A: The LM124DR is a different device variant with enhanced bandwidth characteristics. While this represents improved performance, it may introduce different frequency response behavior in existing circuit designs. Applications sensitive to bandwidth characteristics should be evaluated for compatibility. The higher bandwidth does not create incompatibility but may require circuit validation.
Q: Is the LF444CM/NOPB suitable as a replacement for the LM248D?
A: The LF444CM/NOPB is a J-FET operational amplifier with significantly different input characteristics (10 pA input bias current versus 30 nA for the LM248D). This part is suitable only for applications where extremely low input bias current is required. The narrower operating temperature range (0°C to 70°C) and lower output current per channel (14 mA) make it unsuitable for general replacement. Use this part only when J-FET input characteristics are specifically required.
Q: What is the impact of the narrower supply voltage span in AS324 series parts?
A: The AS324 series specifies a supply voltage span of 3–36 V, compared to the LM248D specification of 44 V. This means the AS324 series cannot operate at supply voltages exceeding 36 V. If your application requires operation at voltages between 36 V and 44 V, the AS324 series is not suitable. Verify your actual supply voltage requirements before selecting this substitute.
Q: Should I use LM124D or LM224AD as replacements for the LM248D?
A: Both LM124D and LM224AD are classified as obsolete, matching the LM248D status. While these parts are functionally compatible, they should not be selected for new designs due to limited procurement viability and discontinued manufacturing. Use active-status alternatives such as AS324MTR-G1 or LM124DR instead.
Q: What does MSL 1 (Unlimited) moisture sensitivity mean?
A: Moisture Sensitivity Level (MSL) 1 indicates that the component has unlimited shelf life under standard storage conditions (typically 30°C, 85% relative humidity). Parts with MSL 1 do not require special moisture-controlled storage and can be stored indefinitely without baking before reflow soldering. Parts with MSL 3 (168 hours) require controlled storage and must be baked before reflow if storage time exceeds 168 hours. For procurement and manufacturing flexibility, MSL 1 parts are preferred.
Q: Are all substitute parts RoHS3 compliant?
A: Yes, all substitute parts listed in this reference are RoHS3 compliant, matching the LM248D certification. RoHS3 compliance indicates the absence of restricted substances (lead, cadmium, mercury, hexavalent chromium, polybrominated biphenyls, and polybrominated diphenyl ethers) and is suitable for applications requiring environmental compliance.
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