Request Quote
(Ships tomorrow)
LM348M Equivalent & Substitute Parts
Part Overview
The LM348M is a general-purpose operational amplifier featuring four independent circuits in a 14-SOIC surface-mount package, manufactured by Texas Instruments. This device is classified as obsolete and operates across a supply voltage range of 36 V with a gain-bandwidth product of 1 MHz and slew rate of 0.5 V/µs. Due to its obsolete status and limited availability relative to active alternatives, identifying equivalent substitute parts is essential for ongoing design support and production continuity. Substitute parts must maintain functional compatibility while meeting current manufacturing and compliance standards.
Substiute Parts
Key Parameters
| Parameter | LM348M 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 | — |
| Product Status | Obsolete | — |
Substitute Part Grouping Explanation
Substitute parts for the LM348M are grouped based on strict electrical and mechanical compatibility criteria. The primary substitution logic is determined by the following parameters:
Critical Matching Parameters:
- Number of circuits: 4 independent amplifier circuits required
- Package type: 14-SOIC surface-mount configuration
- Amplifier type classification: General Purpose or J-FET variants
- Supply voltage compatibility: Minimum 36 V span or higher
- Operating temperature range: Must support 0°C to 70°C minimum
Substitution Categories:
Category 1 – Direct Electrical Equivalents (General Purpose, Identical Specifications): Parts that maintain identical or superior electrical performance within the general-purpose amplifier classification. These include LM348D (onsemi), LM348DR (Texas Instruments), and LM348NSR (Texas Instruments). All three maintain the 0.5 V/µs slew rate, 1 MHz gain-bandwidth product, 30 nA input bias current, and 36 V supply span.
Category 2 – Enhanced Performance Alternatives (General Purpose, Improved Specifications): Parts that provide superior electrical performance while maintaining general-purpose classification and 14-SOIC packaging. LM224ADT and LM224DT offer lower input bias current (20 nA), reduced supply voltage requirement (3–30 V), and extended operating temperature range (-40°C to 105°C), though with slightly reduced gain-bandwidth product (1.3 MHz).
Category 3 – Specialized Alternatives (J-FET Amplifiers): Parts that employ J-FET input stages rather than bipolar inputs. LF247DT, LF347D, and LF347DT provide significantly lower input bias current (20 pA), higher slew rate (16 V/µs), and extended gain-bandwidth product (3–4 MHz). These are suitable for applications requiring ultra-low input bias current and higher frequency response.
Category 4 – Extended Temperature Range Alternative (General Purpose, Differential Output): LM124DT provides differential output configuration with extended military-grade operating temperature range (-55°C to 125°C), suitable for demanding environments.
Category 5 – Modern Low-Power Alternative (General Purpose, Enhanced Supply Range): AS324MTR-E1 (Diodes Incorporated) offers the widest supply voltage range (3–36 V), lowest supply current (1 mA per channel), and extended operating temperature (-40°C to 85°C), representing the most modern active alternative.
Parameter Comparison
| Part Number | Manufacturer | Amplifier Type | Slew Rate (V/µs) | GBW (MHz) | Input Bias (nA/pA) | Input Offset (mV) | Supply Current (mA) | Output Current (mA) | Supply Span (V) | Temp Range (°C) | Status | RoHS |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| LM348M | Texas Instruments | General Purpose | 0.5 | 1 | 30 nA | 1 | 2.4 | 25 | 36 | 0 to 70 | Obsolete | Non-compliant |
| LM348D | onsemi | General Purpose | 0.5 | 1 | 30 nA | 1 | 2.4 | 25 | 8–36 | 0 to 70 | Obsolete | Non-compliant |
| LM348DR | Texas Instruments | General Purpose | 0.5 | 1 | 30 nA | 1 | 2.4 | 25 | 8–36 | 0 to 70 | Active | ROHS3 Compliant |
| LM348NSR | Texas Instruments | General Purpose | 0.5 | 1 | 30 nA | 1 | 2.4 | 25 | 8–36 | 0 to 70 | Last Time Buy | ROHS3 Compliant |
| LM224ADT | STMicroelectronics | General Purpose | 0.4 | 1.3 | 20 nA | 2 | 1.5 | 40 | 3–30 | -40 to 105 | Active | ROHS3 Compliant |
| LM224DT | STMicroelectronics | General Purpose | 0.4 | 1.3 | 20 nA | 2 | 1.5 | 40 | 3–30 | -40 to 105 | Active | ROHS3 Compliant |
| LF247DT | STMicroelectronics | J-FET | 16 | 4 | 20 pA | 3 | 1.4 | 40 | 44 | -40 to 105 | Active | ROHS3 Compliant |
| LF347D | STMicroelectronics | J-FET | 16 | 3 | 20 pA | 3 | 1.4 | 40 | 44 | 0 to 70 | Active | ROHS3 Compliant |
| LF347DT | STMicroelectronics | J-FET | 16 | 4 | 20 pA | 3 | 1.4 | 40 | 44 | 0 to 70 | Active | ROHS3 Compliant |
| LM124DT | STMicroelectronics | General Purpose | 0.4 | 1.3 | 20 nA | 2 | 1.5 | 40 | 3–30 | -55 to 125 | Active | ROHS3 Compliant |
| AS324MTR-E1 | Diodes Incorporated | General Purpose | — | — | 20 nA | 2 | 1 | 40 | 3–36 | -40 to 85 | Active | ROHS3 Compliant |
Engineering Selection Recommendations
For Direct Replacement (Identical Electrical Performance):
LM348DR (Texas Instruments) is the primary recommended substitute. It maintains identical electrical specifications to the LM348M (0.5 V/µs slew rate, 1 MHz gain-bandwidth product, 30 nA input bias current) while offering active product status and ROHS3 compliance. The extended supply voltage range (8–36 V minimum) provides additional design flexibility. Packaging is available in Cut Tape and Digi-Reel formats suitable for production environments.
LM348NSR (Texas Instruments) provides an alternative with identical electrical performance but carries Last Time Buy status, indicating limited future availability. This part is suitable only for designs with extended production lifecycles or where inventory can be secured immediately.
For Designs Requiring Extended Temperature Range:
LM124DT (STMicroelectronics) extends the operating temperature range to -55°C to 125°C while maintaining general-purpose amplifier classification. This part is appropriate for military, aerospace, or industrial applications requiring enhanced temperature performance. Electrical specifications remain comparable to the LM348M with slightly improved input bias current (20 nA) and output current capability (40 mA).
For Low-Power Supply Applications:
LM224ADT and LM224DT (STMicroelectronics) reduce supply current to 1.5 mA per channel and support minimum supply voltage of 3 V, compared to the LM348M's 8 V minimum. These parts are suitable for battery-powered or low-power applications. Both maintain active product status and ROHS3 compliance with extended operating temperature range (-40°C to 105°C).
For Ultra-Low Input Bias Current Applications:
LF247DT, LF347D, and LF347DT (STMicroelectronics) employ J-FET input stages, reducing input bias current to 20 pA (compared to 30 nA in the LM348M). These parts are appropriate for high-impedance signal conditioning, precision instrumentation, or applications sensitive to input bias current effects. All three maintain active status and ROHS3 compliance. LF247DT and LF347DT offer 4 MHz gain-bandwidth product, while LF347D provides 3 MHz.
For Modern Low-Power, Wide Supply Range Applications:
AS324MTR-E1 (Diodes Incorporated) represents the most contemporary alternative, offering the widest supply voltage range (3–36 V), lowest supply current (1 mA per channel), and extended operating temperature (-40°C to 85°C). This part is suitable for modern portable and IoT applications requiring minimal power consumption and flexible supply voltage accommodation.
Compliance Considerations:
All recommended active substitutes comply with ROHS3 standards. The LM348M and LM348D are non-compliant; designs requiring RoHS compliance must transition to LM348DR, LM348NSR, or alternative parts listed above. All parts maintain REACH Unaffected status and EAR99 export classification.
Frequently Asked Questions (FAQ)
Q1: Can LM348DR be used as a direct drop-in replacement for LM348M?
A: Yes. LM348DR maintains identical electrical specifications (0.5 V/µs slew rate, 1 MHz gain-bandwidth product, 30 nA input bias current, 25 mA output current per channel) and 14-SOIC packaging. The primary differences are active product status, ROHS3 compliance, and extended minimum supply voltage (8 V vs. 36 V fixed span). Pin configuration and functional behavior are identical.
Q2: What is the difference between LM348DR and LM348NSR?
A: Both parts maintain identical electrical specifications and 14-SOIC packaging. The primary difference is product status: LM348DR is active with ongoing manufacturing support, while LM348NSR is Last Time Buy, indicating limited future availability. For new designs, LM348DR is preferred. LM348NSR is suitable only for existing production with secured inventory.
Q3: Why would I choose LF247DT over LM348DR if both are 4-circuit amplifiers?
A: LF247DT employs J-FET input stages, providing 20 pA input bias current compared to LM348DR's 30 nA. This 1500× reduction in input bias current is critical for high-impedance applications, precision instrumentation, or designs where input bias current introduces unacceptable error. LF247DT also offers 16 V/µs slew rate and 4 MHz gain-bandwidth product, enabling higher-frequency signal processing. Trade-offs include higher input offset voltage (3 mV vs. 1 mV) and fixed 44 V supply span.
Q4: Is AS324MTR-E1 compatible with LM348M designs?
A: AS324MTR-E1 is functionally compatible for general-purpose amplifier applications but introduces design trade-offs. It provides superior low-power performance (1 mA supply current vs. 2.4 mA) and wider supply voltage range (3–36 V). However, slew rate and gain-bandwidth product are not specified in the datasheet, and input offset voltage is higher (2 mV vs. 1 mV). Verification testing is required for applications sensitive to frequency response or slew rate performance.
Q5: Can I use LM224DT in place of LM348M?
A: LM224DT is functionally compatible for general-purpose amplifier applications with design considerations. It provides improved input bias current (20 nA vs. 30 nA), higher output current (40 mA vs. 25 mA), and extended operating temperature (-40°C to 105°C). However, it requires minimum 3 V supply (vs. 8 V for LM348M) and offers slightly lower gain-bandwidth product (1.3 MHz vs. 1 MHz). Applications requiring the full 36 V supply span or 1 MHz exact bandwidth must verify compatibility.
Q6: What packaging options are available for substitute parts?
A: Substitute parts are available in multiple packaging formats: Cut Tape (CT) & Digi-Reel for high-volume production, Tape & Reel (TR) for automated assembly, and Tube for lower-volume applications. LM348DR is available in CT/Digi-Reel format. LM348NSR, LF247DT, LM224ADT, and LM224DT are available in CT/Digi-Reel. LF347D is available in Tube format. AS324MTR-E1 is available in TR format. Verify packaging availability with your supplier for production requirements.
Q7: Are all substitute parts ROHS3 compliant?
A: All active substitute parts listed (LM348DR, LM348NSR, LM224ADT, LM224DT, LF247DT, LF347D, LF347DT, LM124DT, AS324MTR-E1) are ROHS3 compliant. The original LM348M and LM348D are non-compliant. Designs requiring RoHS compliance must transition to one of the active alternatives.
Q8: Which substitute part offers the best performance for precision analog signal conditioning?
A: LF247DT is optimized for precision applications, providing 20 pA input bias current (1500× lower than LM348M), 16 V/µs slew rate, and 4 MHz gain-bandwidth product. These specifications minimize input bias current errors in high-impedance circuits and support higher-frequency signal processing. Operating temperature range extends to -40°C to 105°C. Trade-offs include 3 mV input offset voltage and fixed 44 V supply span.
Q9: What is the minimum supply voltage for each substitute part?
A: LM348M and LM348D require 36 V fixed supply. LM348DR and LM348NSR require minimum 8 V. LM224ADT, LM224DT, LM124DT, and AS324MTR-E1 require minimum 3 V. LF247DT, LF347D, and LF347DT require 44 V fixed supply. Verify minimum supply voltage compatibility with your circuit design before substitution.
Q10: Can I substitute J-FET amplifiers (LF247DT, LF347D, LF347DT) for general-purpose amplifiers (LM348M)?
A: J-FET amplifiers are functionally compatible for general-purpose applications but introduce performance differences. J-FET input stages provide dramatically lower input bias current (20 pA vs. 30 nA), higher slew rate (16 V/µs vs. 0.5 V/µs), and higher gain-bandwidth product (3–4 MHz vs. 1 MHz). However, input offset voltage is higher (3 mV vs. 1 mV), and supply voltage is fixed at 44 V. Applications requiring the exact 36 V supply span or 1 mV input offset specification must verify compatibility.
Alternative Parts
SJ6012L2TP
Littelfuse Inc.
6 Alternative Parts
JMK107BBJ476MA-RE
Taiyo Yuden
10 Alternative Parts
GMK107BBJ475MA-T
Taiyo Yuden
5 Alternative Parts
SJ6020N2ARP
Littelfuse Inc.
3 Alternative Parts
SJ6025R2ATP
Littelfuse Inc.
4 Alternative Parts
2474-05L
API Delevan Inc.
1 Alternative Parts
4590R-684K
API Delevan Inc.
1 Alternative Parts
CM6560R-334
API Delevan Inc.
1 Alternative Parts
CM6460-104
API Delevan Inc.
1 Alternative Parts
5526-12
API Delevan Inc.
1 Alternative Parts