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LM348DT Equivalent & Substitute Parts
Part Overview
The LM348DT 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 identification of equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support ongoing production requirements for applications utilizing this amplifier topology.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Manufacturer Part Number | LM348DT | — |
| Manufacturer | STMicroelectronics | — |
| Amplifier Type | General Purpose | — |
| Number of Circuits | 4 | — |
| Package / Case | 14-SOIC (0.154", 3.90mm Width) | — |
| Mounting Type | Surface Mount | — |
| Slew Rate | 0.5 | V/µs |
| Gain Bandwidth Product | 1.3 | 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 (Min) | 44 | V |
| Voltage - Supply Span (Max) | 44 | V |
| Operating Temperature | 0 to 70 | °C |
| Product Status | Obsolete | — |
| RoHS Status | ROHS3 Compliant | — |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | — |
Substitute Part Grouping Explanation
Substitution of the LM348DT is determined by electrical and mechanical compatibility across the following critical parameters:
Package Compatibility: All substitute parts must utilize the 14-SOIC (0.154", 3.90mm Width) surface mount package to ensure direct board-level compatibility without layout modifications.
Circuit Configuration: The 4-circuit operational amplifier topology is maintained across all substitutes, preserving functional equivalence for multi-stage amplifier applications.
Electrical Performance Criteria: Substitutes are grouped based on amplifier type classification (General Purpose or J-FET), slew rate performance, gain bandwidth product, input bias current, and supply voltage operating range. Parts with identical or superior electrical characteristics within the same amplifier class are considered direct substitutes.
Supply Voltage Range: The LM348DT operates at a fixed 44 V supply span. Substitute parts with supply voltage ranges that encompass or exceed this specification maintain electrical compatibility.
Temperature Operating Range: Substitutes with equal or extended operating temperature ranges support the original application requirements.
Compliance and Status: Active product status and ROHS3 compliance are preferred for new designs, while obsolete parts with equivalent specifications serve as interim solutions for existing inventory management.
Parameter Comparison
| Parameter | LM348DT (Main) | LM348DR | LM248DR | LM2902DR2G | AS324MTR-E1 | MC33174VDR2G | LT1465CS#PBF |
|---|---|---|---|---|---|---|---|
| Manufacturer | STMicroelectronics | Texas Instruments | Texas Instruments | onsemi | Diodes Incorporated | onsemi | Analog Devices Inc. |
| Amplifier Type | General Purpose | General Purpose | General Purpose | General Purpose | General Purpose | General Purpose | J-FET |
| 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 |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
| Slew Rate (V/µs) | 0.5 | 0.5 | 0.5 | — | — | 2.1 | 0.9 |
| Gain Bandwidth Product (MHz) | 1.3 | 1 | 1 | 1 | — | 1.8 | 1 |
| Current - Input Bias (nA) | 30 | 30 | 30 | 90 | 20 | 20 | 0.5 pA |
| Voltage - Input Offset (mV) | 1 | 1 | 1 | 2 | 2 | 2 | 0.6 mV |
| Current - Supply (mA, x4 Channels) | 2.1 | 2.4 | 2.4 | — | 1 | 0.18 | 0.145 |
| Current - Output / Channel (mA) | 25 | 25 | 25 | 40 | 40 | 27 | — |
| Voltage - Supply Span Min (V) | 44 | 8 | 8 | 3 | 3 | 3 | 10 |
| Voltage - Supply Span Max (V) | 44 | 36 | 36 | 32 | 36 | 44 | 30 |
| Operating Temperature (°C) | 0 to 70 | 0 to 70 | -25 to 85 | -40 to 105 | -40 to 85 | -40 to 125 | -40 to 85 |
| Product Status | Obsolete | Active | Active | Active | Active | Active | Active |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 3 (168 Hours) | 1 (Unlimited) | 1 (Unlimited) |
Engineering Selection Recommendations
Primary Substitutes for Direct Replacement:
The LM348DR (Texas Instruments) and LM248DR (Texas Instruments) are the closest electrical equivalents to the LM348DT. Both devices maintain identical slew rate (0.5 V/µs), input bias current (30 nA), input offset voltage (1 mV), and output current per channel (25 mA) specifications. The LM348DR operates within the same 0°C to 70°C temperature range as the original part and is currently in active production status with ROHS3 compliance and MSL 1 rating, making it the preferred choice for new designs requiring direct functional equivalence.
The LM248DR provides an alternative from Texas Instruments with marginally extended temperature range (-25°C to 85°C) and identical electrical performance characteristics. Both parts are available in Cut Tape and Digi-Reel packaging formats.
Secondary Substitutes with Enhanced Performance:
The MC33174VDR2G (onsemi) offers superior slew rate performance (2.1 V/µs versus 0.5 V/µs) and higher gain bandwidth product (1.8 MHz versus 1.3 MHz), with extended operating temperature range (-40°C to 125°C). This part maintains the same 14-SOIC package and supply voltage span maximum (44 V), making it suitable for applications requiring improved dynamic response characteristics. The MC33174VDR2G is active production status with ROHS3 compliance.
The LM2902DR2G (onsemi) provides active production status with extended temperature range (-40°C to 105°C) and ROHS3 compliance. This part exhibits higher input bias current (90 nA) and input offset voltage (2 mV) compared to the original specification but maintains the same output current capability (40 mA per channel).
Alternative Substitutes with Different Amplifier Topology:
The LT1465CS#PBF and LT1465CS#TRPBF (Analog Devices Inc.) employ J-FET input architecture, offering significantly lower input bias current (0.5 pA) and lower input offset voltage (600 µV). These parts are suitable for applications requiring ultra-low input bias current characteristics. However, the supply voltage range (10 V to 30 V) does not encompass the original 44 V specification, limiting applicability to lower voltage systems. Both parts are in active production status with ROHS3 compliance.
The AS324MTR-E1 (Diodes Incorporated) is available in active production status with extended temperature range (-40°C to 85°C) and ROHS3 compliance. This part exhibits lower input bias current (20 nA) and higher output current capability (40 mA per channel) but operates within a reduced supply voltage range (3 V to 36 V) that does not fully encompass the original 44 V specification.
Compliance and Availability Considerations:
All recommended substitutes maintain ROHS3 compliance and EAR99 ECCN classification consistent with the original part. The LM348DR and LM248DR from Texas Instruments are preferred for applications requiring strict electrical parameter matching and identical operating temperature specifications. For applications permitting extended temperature operation or enhanced performance characteristics, the MC33174VDR2G provides superior dynamic response within the same package footprint and supply voltage envelope.
Frequently Asked Questions (FAQ)
Q: Can the LM348DR be used as a direct replacement for the LM348DT without circuit modifications?
A: Yes. The LM348DR maintains identical electrical specifications for slew rate (0.5 V/µs), input bias current (30 nA), input offset voltage (1 mV), and output current per channel (25 mA). Both devices utilize the 14-SOIC package with identical pinout and footprint. The supply voltage range of the LM348DR (8 V to 36 V) encompasses the original 44 V fixed supply specification. No circuit modifications are required for direct substitution.
Q: What is the primary difference between the LM348DR and the MC33174VDR2G?
A: The MC33174VDR2G provides enhanced dynamic performance with slew rate of 2.1 V/µs (compared to 0.5 V/µs) and gain bandwidth product of 1.8 MHz (compared to 1 MHz). The MC33174VDR2G also operates across an extended temperature range (-40°C to 125°C). Both devices share the same 14-SOIC package and 44 V maximum supply voltage specification. The MC33174VDR2G is suitable for applications requiring faster signal response, while the LM348DR is appropriate for applications with identical performance requirements to the original LM348DT.
Q: Why do some substitute parts list supply voltage ranges that do not include 44 V?
A: The LM348DT operates at a fixed 44 V supply span (minimum and maximum both specified as 44 V), which is a specialized high-voltage configuration. Most general-purpose operational amplifiers are designed for lower supply voltage ranges (typically 3 V to 36 V). Substitutes with lower maximum supply voltage ratings are not suitable for applications requiring 44 V operation. The LM348DR, LM248DR, and MC33174VDR2G all support the 44 V maximum supply voltage requirement.
Q: Is the LT1465CS#PBF a suitable substitute for the LM348DT?
A: The LT1465CS#PBF is a J-FET input operational amplifier with significantly different electrical characteristics, including ultra-low input bias current (0.5 pA) and lower input offset voltage (600 µV). However, the supply voltage range (10 V to 30 V maximum) does not encompass the original 44 V specification. This part is suitable only for applications operating at lower supply voltages where the superior input bias current characteristics provide functional advantage.
Q: What packaging options are available for substitute parts?
A: All substitute parts maintain the 14-SOIC (0.154", 3.90mm Width) surface mount package, ensuring identical board-level compatibility. Packaging formats vary by manufacturer and part number: the LM348DR and LM248DR are available in Cut Tape and Digi-Reel formats; the LM2902DR2G is available in Cut Tape and Digi-Reel; the AS324MTR-E1 is available in Tape & Reel; the MC33174VDR2G is available in Cut Tape; and the LT1465CS#PBF and LT1465CS#TRPBF are available in Tube and Tape & Reel formats respectively.
Q: Are all substitute parts ROHS3 compliant?
A: Yes. All recommended substitute parts maintain ROHS3 compliance consistent with the original LM348DT specification. The AS324MTR-E1 carries MSL 3 (168 Hours) rating, while all other substitutes maintain MSL 1 (Unlimited) rating, matching the original part's moisture sensitivity classification.
Q: Which substitute part offers the best availability?
A: The LM2902DR2G (onsemi) has the highest inventory level at 205,100 pieces in stock. The MC33174VDR2G (onsemi) has 27,984 pieces available. The LM348DR (Texas Instruments) has 23,947 pieces in stock. All three parts are in active production status, ensuring long-term supply continuity.
Q: Can the AS324MTR-E1 be used in applications requiring 44 V supply operation?
A: No. The AS324MTR-E1 operates within a supply voltage range of 3 V to 36 V maximum, which does not encompass the 44 V specification of the original LM348DT. This part is suitable only for applications operating at 36 V or lower supply voltages.
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