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STMicroelectronics LM348DT
- Part No.:
- LM348DT
- Manufacturer:
- STMicroelectronics
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM348DT.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,214
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Product details
Overview
LM348DT from STMicroelectronics is a quad bipolar operational amplifier with pin compatibility to LM124/LM224/LM324 and functional equivalence to UA741 per channel. It delivers 1.3 MHz gain-bandwidth product, 1 mV input offset voltage, 2 nA input offset current, and operates from ±22 V supply across 0 °C to 70 °C. It is used in multi-channel signal conditioning circuits requiring low power and high channel isolation.
For engineers reviewing the LM348DT datasheet, LM348DT pinout, LM348DT application, or LM348DT equivalent, key selection criteria include supply current per amplifier (0.53 mA), channel separation (120 dB), input bias current (30 nA), output swing (±12 V at 10 kΩ), and SO14 package thermal performance in industrial analog subsystems.
Technical Context
The LM348DT integrates four independent, internally compensated op-amps on a single die, each replicating UA741 behavior with improved DC precision and lower quiescent current. Its Class AB output stage eliminates crossover distortion, and independent biasing plus optimized layout achieves 120 dB inter-amplifier isolation.
It supports rail-to-rail input common-mode range (±12 V at ±15 V supply) and delivers ±12 V output swing into 10 kΩ loads. The 0.25–0.5 V/μs slew rate and 0.08% THD at 1 kHz enable audio and instrumentation-grade signal processing without external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain bandwidth product | 1.3 MHz typical - sets usable small-signal bandwidth for unity-gain stable configurations up to ~1.3 MHz. |
| Input offset voltage | 1 mV max at 25 °C - enables accurate DC-coupled amplification with ≤10 mV error in 10× gain stages. |
| Input bias current | 30 nA typical at 25 °C - allows use with high-impedance sensor interfaces (e.g., photodiode transimpedance) without significant error. |
| Supply current (all amps) | 2.1–3.6 mA at ±15 V - matches single UA741 consumption, enabling 4× density without increasing system power budget. |
| Channel separation | 120 dB - prevents crosstalk-induced modulation in multi-channel filters or simultaneous sampling systems. |
| Output voltage swing | ±12 V into 10 kΩ - provides full dynamic range near supply rails for ±15 V systems, reducing need for level-shifting. |
Pinout & Package
LM348DT is housed in a 14-lead Small Outline (SO14) package, 8.55–8.75 mm body length, 3.80–4.00 mm width, 1.35–1.75 mm height, with 1.27 mm lead pitch. RoHS-compliant and ECOPACK® certified.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Amplifier 1 output | Single-ended voltage source driving external load or feedback network; requires local decoupling if driving capacitive loads >100 pF. |
| 2 | Amplifier 1 inverting input | Inverts and sums input signals; high-impedance node sensitive to PCB leakage and stray capacitance. |
| 3 | Amplifier 1 non-inverting input | Reference or signal input node; common-mode range extends to ±12 V with ±15 V supplies. |
| 4 | Negative supply (V−) | Common return for all four amplifiers; must be low-impedance and decoupled near package. |
| 5 | Amplifier 2 non-inverting input | Independent high-impedance input for second channel; isolated from other channels by >120 dB. |
| 6 | Amplifier 2 inverting input | Configurable for inverting gain or summing; shares no internal nodes with other amplifier inputs. |
| 7 | Amplifier 2 output | Independent output stage with Class AB drive; capable of ±25 mA short-circuit current. |
| 8 | Amplifier 3 output | Third channel output; identical electrical specs and thermal behavior as pins 1 and 7. |
| 9 | Amplifier 3 inverting input | Third channel inverting node; layout-isolated to maintain channel separation specification. |
| 10 | Amplifier 3 non-inverting input | Third channel non-inverting input; supports same common-mode range and bias current as pin 3. |
| 11 | Positive supply (V+) | Common power rail for all amplifiers; requires 100 nF ceramic + 10 µF tantalum decoupling. |
| 12 | Amplifier 4 non-inverting input | Fourth channel reference input; electrically identical to pins 3, 5, and 10. |
| 13 | Amplifier 4 inverting input | Fourth channel summing/inverting node; fully isolated from other channels per datasheet test. |
| 14 | Amplifier 4 output | Final channel output; supports same load drive and slew rate as other outputs. |
Key Features
| Feature | Design Value |
|---|---|
| Low supply current per amplifier | 0.53 mA - enables 4-channel operation within same power envelope as one UA741, critical for space-constrained analog front-ends. |
| Class AB output stage | No crossover distortion - preserves waveform fidelity in audio preamps and precision AC signal chains without post-filtering. |
| 120 dB channel separation | Minimizes inter-channel coupling in multi-stage active filters or simultaneous-sampling data acquisition systems. |
| Pin-compatible with LM124/LM224/LM324 | Drop-in replacement in existing designs using those families, preserving PCB layout and bill-of-materials continuity. |
Applications
| Instrumentation Amplifier Front-End | Multi-Channel Sensor Signal Conditioning |
|---|---|
Use Scenario: Amplifying low-level bridge sensor outputs (e.g., strain gauges) with high common-mode rejection and minimal drift. IC Role / Device Role / Timing Role: First-stage differential-to-single-ended conversion and gain setting via external resistors; uses two amplifiers per channel in standard 3-op-amp IA topology. Use Value: 70–110 dB CMRR and 1 mV Vio ensure <0.1% gain error over temperature in 100× gain configurations. | Use Scenario: Simultaneous conditioning of four thermocouple or RTD signals in industrial PLC analog input modules. IC Role / Device Role / Timing Role: Per-channel cold-junction compensation, filtering, and level-shifting prior to ADC sampling. Use Value: 120 dB channel separation prevents cross-talk between adjacent channels during multiplexed acquisition. |
| Audio Pre-Amplifier Stage | Active Filter Bank (Low-Pass/High-Pass) |
Use Scenario: Low-noise microphone preamplification in voice-controlled IoT devices operating from ±15 V rails. IC Role / Device Role / Timing Role: High-input-impedance, low-distortion gain stage with 0.08% THD at 1 kHz and 2.5 MΩ input resistance. Use Value: Class AB output eliminates crossover artifacts, preserving speech intelligibility without post-processing. | Use Scenario: Four-pole active filter bank for anti-aliasing and reconstruction in multi-channel data converters. IC Role / Device Role / Timing Role: Independent Sallen-Key or multiple-feedback topology implementation per channel using one amplifier per pole. Use Value: 1.3 MHz GBP supports 100 kHz cutoff frequencies with <0.5 dB passband ripple in 4th-order designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad bipolar op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM324DT | Wider temp range (−40 °C to 105 °C), higher input offset voltage (3 mV max), lower GBP (1.2 MHz), same SO14 package. | Preferred for extended-temperature industrial control; less suitable for precision DC-coupled stages. | Select LM324DT when ambient exceeds 70 °C or cost sensitivity outweighs Vio/GBP requirements. |
| TL084CDT | JFET-input architecture, higher GBP (3 MHz), higher input impedance (>10¹² Ω), but higher Vio (6 mV max) and no Class AB output. | Better for high-Z sources (e.g., piezoelectric sensors); unsuitable where crossover distortion must be avoided. | Choose TL084CDT for wide-bandwidth AC-coupled applications with ultra-low input bias current needs. |
Compared with LM324DT and TL084CDT, LM348DT uniquely balances UA741 compatibility, low Vio, Class AB linearity, and 4-channel integration in SO14-making it optimal for legacy-replacement and precision multi-channel DC signal paths where distortion and offset are critical.
Availability
LM348DT is available at Aetrix Electronics and suitable for industrial sensor interfaces, analog front-end modules, and multi-channel instrumentation systems requiring stable component supply and long-term obsolescence management.
Supply support for LM348DT includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power ICs, analog components, and MEMS sensors for industrial, automotive, and consumer markets.
The LM348DT belongs to ST's legacy analog op-amp portfolio, engineered for pin- and function-compatible upgrades of UA741-based designs while improving power efficiency, channel isolation, and DC accuracy in multi-amplifier systems.
FAQ
What is the maximum supply voltage for LM348DT?
The absolute maximum supply voltage is ±22 V, meaning total supply span may not exceed 44 V. Operation at ±15 V is standard and validated across the full 0 °C to 70 °C temperature range. Exceeding ±22 V risks permanent damage to internal junctions and is not recoverable.
Does LM348DT require external frequency compensation?
No. LM348DT is internally compensated for unity-gain stability across its specified operating conditions. External compensation capacitors are unnecessary and may degrade phase margin or cause oscillation if added to the feedback path.
Can LM348DT drive capacitive loads directly?
LM348DT can safely drive ≤100 pF capacitive loads without instability. For larger loads (e.g., cables or ADC input capacitance), a 10–100 Ω series resistor must be placed between the output pin and the load to isolate the capacitance from the op-amp's output stage.
Is LM348DT suitable for automotive applications?
No. LM348DT is rated for 0 °C to 70 °C operation and is not qualified to AEC-Q100 standards. ST explicitly states its products are not designed or authorized for safety-critical, automotive, or aerospace use unless formally designated as such in product specifications.
LM348DT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 4
- Output Type:
- -
- Slew Rate:
- 0.5V/µs
- Gain Bandwidth Product:
- 1.3 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 30 nA
- Voltage - Input Offset:
- 1 mV
- Current - Supply:
- 2.1mA (x4 Channels)
- Current - Output / Channel:
- 25 mA
- Voltage - Supply Span (Min):
- 44 V
- Voltage - Supply Span (Max):
- 44 V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SO
LM348DT FAQ
1.How can I place an order for LM348DT through Aetrix?
Please submit a Request for Quotation (RFQ) for LM348DT on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LM348DT reliable?
The price and inventory of LM348DT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM348DT is usually 5 days.
3.What payment methods are accepted for LM348DT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM348DT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM348DT?
LM348DT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM348DT order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LM348DT?
For technical support, including LM348DT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM348DT requirements.
6.How does Aetrix verify that LM348DT is sourced from the original manufacturer or authorized distributors?
All LM348DT products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LM348DT meets industry standards.
7.What is the process for return or replacement of LM348DT?
All LM348DT units undergo pre-shipment inspection (PSI). If there is an issue with LM348DT, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LM348DT part is unused and in its original packaging.
Return procedure for LM348DT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM348DT Tags
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LM358DT
STMicroelectronics
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LM358DR
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LM2904DR
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LM358ADR
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LM2904DGKR
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LM324DR
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MCP6006T-E/OT
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MCP6006UT-E/OT
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LM324PWR
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LM2902PWR
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