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LM348M/NOPB Equivalent & Substitute Parts
Part Overview
The LM348M/NOPB is a general-purpose operational amplifier integrated circuit containing four independent amplifier circuits in a 14-SOIC surface-mount package. Manufactured by Texas Instruments, this device is classified as obsolete and is no longer in active production. The LM348M/NOPB operates across a supply voltage range of 36 V with a slew rate of 0.5 V/µs and a gain bandwidth product of 1 MHz, making it suitable for general-purpose analog signal processing applications.
Due to its obsolete status, component sourcing for new designs or production runs requires identification of equivalent and substitute parts that maintain functional compatibility while offering improved availability or enhanced performance characteristics. Substitute parts are selected based on matching electrical parameters, package compatibility, and operational specifications.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Amplifier Type | General Purpose | — |
| Number of Circuits | 4 | — |
| 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) | 2.4 | mA |
| Current - Output / Channel | 25 | mA |
| Voltage - Supply Span | 36 | V |
| Operating Temperature | 0 to 70 | °C |
| Package / Case | 14-SOIC (0.154", 3.90mm Width) | — |
| Mounting Type | Surface Mount | — |
| RoHS Status | ROHS3 Compliant | — |
Substitute Part Grouping Explanation
Substitute parts for the LM348M/NOPB are categorized into two functional groups based on electrical and operational compatibility:
Group 1: Direct Electrical Equivalents (General Purpose Amplifiers)
Direct substitutes maintain the same amplifier type (general purpose), circuit count (4), and core electrical specifications including slew rate (0.5 V/µs), gain bandwidth product (1 MHz), input bias current (30 nA), and input offset voltage (1 mV). These parts are functionally interchangeable in applications where the LM348M/NOPB was originally specified. Parts in this group include the LM348D, LM348DR, and LM348NSR, all sharing the LM348 base product number.
Group 2: Enhanced Performance Alternatives (J-FET and Improved General Purpose Amplifiers)
Enhanced alternatives offer superior electrical performance while maintaining the four-circuit configuration and 14-SOIC package footprint. These include J-FET amplifiers (LF247DT, LF347D, LF347DT) with higher slew rates (16 V/µs), lower input bias currents (20 pA), and extended temperature ranges, as well as improved general-purpose amplifiers (LM124DT, LM224D, LM248DT, LM2902DR2G) with lower supply voltage minimums and wider operating temperature ranges.
Key Parameters Determining Substitution:
- Amplifier type (general purpose vs. J-FET)
- Number of circuits (4 required)
- Package type (14-SOIC surface mount)
- Slew rate (0.5 V/µs minimum for direct equivalents)
- Gain bandwidth product (1 MHz minimum for direct equivalents)
- Supply voltage compatibility (minimum 8 V for most substitutes)
- Input bias current and offset voltage specifications
- Operating temperature range
- Product status and RoHS compliance
Parameter Comparison
| Part Number | Manufacturer | Amplifier Type | Slew Rate (V/µs) | GBW (MHz) | Input Bias (nA) | Input Offset (mV) | Supply Current (mA) | Output Current (mA) | Supply Span (V) | Temp Range (°C) | Product Status |
|---|---|---|---|---|---|---|---|---|---|---|---|
| LM348M/NOPB | Texas Instruments | General Purpose | 0.5 | 1 | 30 | 1 | 2.4 | 25 | 36 | 0 to 70 | Obsolete |
| LM348D | onsemi | General Purpose | 0.5 | 1 | 30 | 1 | 2.4 | 25 | 8 to 36 | 0 to 70 | Obsolete |
| LM348DR | Texas Instruments | General Purpose | 0.5 | 1 | 30 | 1 | 2.4 | 25 | 8 to 36 | 0 to 70 | Active |
| LM348NSR | Texas Instruments | General Purpose | 0.5 | 1 | 30 | 1 | 2.4 | 25 | 8 to 36 | 0 to 70 | Last Time Buy |
| LF247DT | STMicroelectronics | J-FET | 16 | 4 | 0.02 | 3 | 1.4 | 40 | 44 | -40 to 105 | Active |
| LF347D | STMicroelectronics | J-FET | 16 | 3 | 0.02 | 3 | 1.4 | 40 | 44 | 0 to 70 | Active |
| LF347DT | STMicroelectronics | J-FET | 16 | 4 | 0.02 | 3 | 1.4 | 40 | 44 | 0 to 70 | Active |
| LM124DT | STMicroelectronics | General Purpose | 0.4 | 1.3 | 20 | 2 | 1.5 | 40 | 3 to 30 | -55 to 125 | Active |
| LM224D | STMicroelectronics | General Purpose | 0.4 | 1.2 | 20 | 2 | 1.5 | 40 | 3 to 30 | -40 to 105 | Active |
| LM248DT | STMicroelectronics | General Purpose | 0.5 | 1.3 | 30 | 1 | 2.1 | 25 | 44 | -40 to 105 | Active |
| LM2902DR2G | onsemi | General Purpose | — | 1 | 90 | 2 | — | 40 | 3 to 32 | -40 to 105 | Active |
Engineering Selection Recommendations
For Direct Functional Replacement:
The LM348DR (Texas Instruments, Active status) is the primary recommended substitute for the LM348M/NOPB. This part maintains identical electrical specifications including slew rate, gain bandwidth product, input bias current, and input offset voltage. The LM348DR is currently in active production with ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1), ensuring long-term availability and regulatory compliance. The extended supply voltage range (8 to 36 V) provides additional design flexibility compared to the original 36 V specification.
The LM348NSR (Texas Instruments, Last Time Buy status) offers equivalent electrical performance with identical core specifications. However, its Last Time Buy status indicates limited future availability, making it suitable only for near-term production requirements.
The LM348D (onsemi, Obsolete status) provides electrical equivalence but shares the obsolete classification with the original part, limiting its utility for new sourcing initiatives.
For Enhanced Performance Applications:
The LM248DT (STMicroelectronics, Active status) matches the original slew rate (0.5 V/µs) and input specifications while offering improved gain bandwidth product (1.3 MHz) and extended operating temperature range (-40 to 105°C). This part is suitable for applications requiring higher performance margins and wider temperature operation.
The LM124DT and LM224D (STMicroelectronics, Active status) provide general-purpose amplification with lower supply voltage minimums (3 V) and extended temperature ranges, enabling use in low-voltage and wide-temperature applications. These parts feature lower input bias currents (20 nA) and improved gain bandwidth products (1.2 to 1.3 MHz).
For High-Speed Applications:
The LF247DT and LF347DT (STMicroelectronics, Active status) are J-FET amplifiers offering significantly enhanced performance with slew rates of 16 V/µs, gain bandwidth products of 3 to 4 MHz, and extremely low input bias currents (20 pA). These parts are suitable for applications requiring high-speed signal processing, low input current, and extended temperature operation (-40 to 105°C). The higher supply voltage requirement (44 V) must be verified against circuit design constraints.
For High-Volume Production:
The LM2902DR2G (onsemi, Active status) offers the highest inventory availability (205,100 pieces) with active production status. This part provides general-purpose amplification with 1 MHz gain bandwidth product and extended temperature range (-40 to 105°C). The lower supply voltage minimum (3 V) and higher output current capability (40 mA) support diverse application requirements. Higher input bias current (90 nA) and input offset voltage (2 mV) specifications require verification against circuit tolerance requirements.
All recommended active-status substitutes maintain ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1), ensuring compatibility with modern manufacturing and environmental standards.
Frequently Asked Questions (FAQ)
Q: Can the LM348DR be used as a direct replacement for the LM348M/NOPB without circuit modifications?
A: Yes. The LM348DR maintains identical electrical specifications for slew rate (0.5 V/µs), gain bandwidth product (1 MHz), input bias current (30 nA), and input offset voltage (1 mV). The package type (14-SOIC surface mount) and pinout are identical. The extended supply voltage range (8 to 36 V) provides additional design margin. No circuit modifications are required for functional equivalence.
Q: What is the primary difference between Group 1 (direct equivalents) and Group 2 (enhanced alternatives)?
A: Group 1 parts (LM348D, LM348DR, LM348NSR) maintain identical electrical performance specifications to the original LM348M/NOPB, ensuring drop-in compatibility. Group 2 parts offer enhanced performance characteristics such as higher slew rates, lower input bias currents, wider temperature ranges, or lower supply voltage minimums. Group 2 selection requires verification that enhanced specifications do not introduce circuit incompatibilities or design complications.
Q: Why do some substitute parts have different supply voltage specifications than the original LM348M/NOPB?
A: The original LM348M/NOPB specifies a fixed 36 V supply span, indicating operation at a single supply voltage. Substitute parts such as the LM348DR specify a range (8 to 36 V), indicating compatibility across a voltage range. This represents improved flexibility rather than incompatibility. Circuit designs must verify that the actual supply voltage used falls within the substitute part's specified range.
Q: Are J-FET amplifiers (LF247DT, LF347DT) suitable replacements for general-purpose applications?
A: J-FET amplifiers offer superior performance characteristics including higher slew rates (16 V/µs vs. 0.5 V/µs) and extremely low input bias currents (20 pA vs. 30 nA). These characteristics make J-FET amplifiers suitable for applications requiring high-speed signal processing or extremely low input current. However, the higher supply voltage requirement (44 V) and different input offset voltage (3 mV vs. 1 mV) must be verified against circuit design constraints. J-FET amplifiers are not recommended as direct replacements without circuit analysis.
Q: What does "Last Time Buy" status mean for the LM348NSR?
A: Last Time Buy status indicates that the manufacturer has announced the end of production for this part. Existing inventory may be available for a limited time, but no new production runs are planned. This status makes the LM348NSR unsuitable for long-term production sourcing. The LM348DR (Active status) is the preferred alternative for ongoing component requirements.
Q: Why is the LM2902DR2G recommended for high-volume production despite higher input bias current?
A: The LM2902DR2G offers the highest inventory availability (205,100 pieces) with active production status, ensuring reliable long-term sourcing for high-volume applications. The higher input bias current (90 nA vs. 30 nA) and input offset voltage (2 mV vs. 1 mV) require circuit verification but do not preclude use in many general-purpose applications. The lower supply voltage minimum (3 V) and higher output current capability (40 mA) provide additional design flexibility.
Q: What packaging options are available for substitute parts?
A: Substitute parts are available in multiple packaging formats: Cut Tape (CT) & Digi-Reel for automated assembly, Tape & Reel (TR) for high-volume production, and Tube for manual assembly or lower-volume applications. The LM348DR is available in Cut Tape & Digi-Reel format, the LM348NSR in Tape & Reel format, and the LM348D in Tube format. Selection should match production volume and assembly process requirements.
Q: Are all substitute parts RoHS3 compliant?
A: All recommended active-status substitute parts (LM348DR, LM248DT, LM124DT, LM224D, LF247DT, LF347D, LF347DT, LM2902DR2G) are ROHS3 compliant. The obsolete-status parts (LM348M/NOPB, LM348D) and Last Time Buy part (LM348NSR) maintain ROHS3 compliance. RoHS compliance ensures compatibility with modern manufacturing standards and environmental regulations.
Q: What is the moisture sensitivity level (MSL) for substitute parts?
A: All recommended substitute parts maintain MSL 1 (Unlimited) rating, identical to the original LM348M/NOPB. This rating indicates no moisture sensitivity restrictions and unlimited shelf life under standard storage conditions. No special moisture control measures are required during handling, storage, or assembly.
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