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Texas Instruments LM348DR
- Part No.:
- LM348DR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM348DR.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:10,439
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Product details
Overview
LM348DR from Texas Instruments is a quadruple, independent, high-gain, internally compensated operational amplifier designed for general-purpose analog signal conditioning. It delivers 0.6 mA typical supply current per amplifier, ≤6 mV input offset voltage at 25°C, and ±12 V common-mode input range with ±15 V supplies - used in industrial sensor interfaces, legacy instrumentation amplifiers, and multi-channel DC-coupled signal chains.
For engineers reviewing the LM348DR datasheet, LM348DR pinout, LM348DR application, or LM348DR equivalent, this page provides verified electrical parameters, SOIC-14 package details, functional interchangeability with LM148/LM248, thermal derating guidance, and design-meaningful feature translation - all specific to the LM348DR variant operating from 0°C to 70°C.
Technical Context
The LM348DR implements four independent Class AB op-amps with internal frequency compensation, enabling stable unity-gain operation without external components. Each amplifier features input/output overload protection and low input bias current (30 nA typ at 25°C), supporting precision DC-coupled configurations.
It shares the µA741-compatible architecture but improves on key specs: input offset current is 4 nA typ (vs. ~200 nA for µA741), and supply current is 2.4 mA total (0.6 mA per amp) - making it suitable for multi-amplifier circuits where quiescent power matters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | ±4 V to ±18 V - supports dual-rail operation in legacy ±12 V and ±15 V systems without level-shifting. |
| Input Offset Voltage | ≤6 mV max at 25°C - enables accurate DC amplification in 12-bit ADC front-ends with <0.1% gain error contribution. |
| Input Bias Current | 30 nA typ at 25°C - permits use with high-impedance sources (e.g., pH electrodes, thermocouples) without significant offset drift. |
| Slew Rate | 0.5 V/µs - sufficient for audio-band (<20 kHz) and slow-control-loop applications (e.g., temperature setpoint regulation). |
| Common-Mode Input Range | ±12 V at ±15 V supplies - allows rail-to-rail input handling within 3 V of each supply, simplifying sensor interface design. |
| Unity-Gain Bandwidth | 1 MHz - ensures stability in basic inverting/non-inverting configurations without added compensation. |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade embedded control, test equipment, and office automation systems. |
Pinout & Package
LM348DR uses a 14-pin SOIC (D) package with standard 1.27 mm pitch, 8.65 mm × 3.91 mm body size, and 1.75 mm maximum height - compatible with automated SMT assembly and IPC-7351B land patterns.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Amplifier 1 Output | Class AB push-pull output stage capable of ±25 mA short-circuit current - drives 2 kΩ loads to ±10 V swing. |
| 2 | Amplifier 1 Inverting Input | Differential input with 0.8 MΩ minimum input resistance - accepts feedback networks up to 1 MΩ without significant error. |
| 3 | Amplifier 1 Non-Inverting Input | High-impedance node (30 nA bias current) - used for reference voltage buffering or sensor excitation. |
| 4 | Positive Supply (VCC+) | Connects to +V rail; internal ESD clamps limit differential voltage to 36 V - requires decoupling near pin. |
| 5 | Amplifier 2 Non-Inverting Input | Independent input for second channel - no crosstalk (120 dB attenuation at 1 Hz–20 kHz) between amplifiers. |
| 6 | Amplifier 2 Inverting Input | Matches Pin 2 electrically - supports matched gain-setting resistor networks across all four amps. |
| 7 | Amplifier 2 Output | Identical output capability to Pin 1 - enables parallel output stages or dual-supply active filters. |
| 8 | Amplifier 3 Output | Third independent output - allows three-stage signal conditioning (e.g., gain → filter → level shift) on one IC. |
| 9 | Amplifier 3 Inverting Input | Same input specs as Pins 2/6 - maintains consistent noise and offset behavior across all channels. |
| 10 | Amplifier 3 Non-Inverting Input | Enables simultaneous buffer/reference functions for multiple subsystems (e.g., ADC reference + DAC output buffer). |
| 11 | Negative Supply (VCC–) | Connects to –V rail; symmetric layout with Pin 4 minimizes ground bounce in multi-amp layouts. |
| 12 | Amplifier 4 Non-Inverting Input | Fourth channel input - supports quad-sensor readout (e.g., 4-wire RTD bridge, multi-axis transducer). |
| 13 | Amplifier 4 Inverting Input | Matches all other inverting inputs - allows identical feedback topology across all four amplifiers. |
| 14 | Amplifier 4 Output | Final output channel - completes full quad functionality without external interconnects. |
Key Features
| Feature | Design Value |
|---|---|
| Internally Compensated | Stable unity-gain operation without external capacitors - reduces BOM count and layout sensitivity in cost-sensitive designs. |
| Input/Output Overload Protection | Prevents latch-up during transient overvoltage or short-circuit events - eliminates need for external current-limiting resistors. |
| Low Supply-Current Drain | 2.4 mA total (0.6 mA per amplifier) at ±15 V - extends battery life in portable multi-channel instruments. |
| Interchangeable with LM148/LM248 | Pin-compatible and functionally equivalent across temperature grades - enables drop-in replacement in existing LM348 designs. |
| High Common-Mode Rejection | 70 dB min over full temperature range - rejects noise in differential sensor measurements (e.g., strain gauges, current shunts). |
Applications
| Industrial Sensor Signal Conditioning | Legacy Test Equipment Amplifier Stages |
|---|---|
Use Scenario: Amplifying low-level outputs from RTDs, thermocouples, and pressure transducers in PLC analog input modules. IC Role / Device Role / Timing Role: Quad op-amp performs simultaneous gain, filtering, level shifting, and reference buffering across four sensor channels. Use Value: Single LM348DR replaces four discrete op-amps, reducing PCB area by >60% and eliminating matching errors between channels. |
Use Scenario: Replacing aging µA741-based amplifier sections in oscilloscope vertical deflection circuits and function generator output stages. IC Role / Device Role / Timing Role: Direct functional substitute for µA741 with improved input bias and offset specs - maintains original circuit topology. Use Value: Enables repair and obsolescence mitigation without redesign; 0.5 V/µs slew rate preserves fidelity in 10–20 kHz test waveforms. |
| Multi-Channel Data Acquisition Front-Ends | DC Motor Speed Control Feedback Loops |
Use Scenario: Preconditioning signals from 4-channel ADCs in environmental monitoring systems (e.g., air quality analyzers with gas sensors). IC Role / Device Role / Timing Role: Provides anti-aliasing filtering, gain adjustment, and drive capability for successive-approximation ADC inputs. Use Value: 120 dB crosstalk attenuation prevents channel-to-channel interference in simultaneous sampling architectures. |
Use Scenario: Closed-loop tachometer signal conditioning and PWM error amplifier in brushed DC motor controllers for HVAC actuators. IC Role / Device Role / Timing Role: Integrates speed feedback comparison, PI compensation, and gate-drive interface logic in compact form factor. Use Value: Low 6 mV offset ensures <1% speed regulation error at zero RPM - critical for precise positioning applications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM348N | Same electrical specs but in 14-pin PDIP package; higher θJA (80°C/W vs. 86°C/W for SOIC); lead-free finish. | Preferred for through-hole prototyping, manual rework, or legacy board repairs where SOIC footprint is unavailable. | Select LM348N when hand-soldering or compatibility with older DIP-based test fixtures is required. |
| LM248DR | Identical SOIC-14 package and pinout; wider temperature range (–25°C to 85°C); same 6 mV VIOmax but higher IIB (30–400 nA vs. 30–200 nA for LM348DR). | Suitable for extended-temperature industrial environments (e.g., outdoor enclosures, automotive under-hood proximity). | Choose LM248DR if operation beyond 70°C is needed; otherwise LM348DR offers optimal cost/performance for commercial-grade systems. |
Compared with LM348N, LM348DR saves 40% board space and improves thermal performance in reflow-soldered assemblies; compared with LM248DR, it trades 15°C operating margin for lower cost and tighter input bias current spec - ideal for cost-sensitive, room-temperature-stable applications.
Availability
LM348DR is available at Aetrix Electronics and suitable for industrial sensor interfaces, legacy test equipment upgrades, and multi-channel data acquisition systems requiring stable component supply and long-term manufacturing continuity.
Supply support for LM348DR 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
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity technologies - with over 50 years of op-amp innovation and broad industrial qualification.
The LM348DR belongs to TI's legacy general-purpose op-amp family, engineered for reliability in commercial-grade instrumentation, control systems, and repair markets - emphasizing pin compatibility, robustness, and ease of substitution.
FAQ
What is the maximum supply voltage rating for LM348DR?
The LM348DR has an absolute maximum supply voltage rating of ±18 V across VCC+ and VCC– terminals. Operating beyond this risks permanent damage. For reliable continuous operation, TI specifies recommended limits of ±4 V to ±18 V - with thermal derating required above 70°C ambient due to its SOIC package's 86°C/W junction-to-ambient thermal resistance. Always verify power dissipation using PD = (TJ(max) – TA)/θJA.
Is LM348DR pin-compatible with LM148 and LM248?
Yes, LM348DR is fully pin-compatible with LM148 and LM248 in the SOIC-14 (D) package. All three share identical pin assignments, electrical characteristics, and functional behavior - differing only in temperature grade (LM348DR: 0°C to 70°C; LM248DR: –25°C to 85°C; LM148: –55°C to 125°C) and minor input bias current tolerances. This enables direct substitution in existing LM348DR layouts without PCB changes.
Does LM348DR require external compensation capacitors?
No, LM348DR does not require external compensation capacitors. It is internally compensated for stable unity-gain operation, as confirmed by its 1 MHz unity-gain bandwidth and 60° phase margin at AVD = 1. This eliminates the need for external capacitors in standard inverting, non-inverting, or voltage-follower configurations - simplifying design and improving layout robustness in cost-sensitive applications.
What is the input offset voltage specification for LM348DR over temperature?
The LM348DR has a maximum input offset voltage of 6 mV at 25°C and 7.5 mV over its full operating range (0°C to 70°C). This value is guaranteed by TI's production testing and reflects worst-case drift across temperature - critical for DC-coupled applications like sensor amplification where offset directly impacts measurement accuracy. Typical offset remains ≤1 mV at 25°C.
Can LM348DR drive a 2 kΩ load to ±10 V output swing?
Yes, LM348DR can drive a 2 kΩ load to ±10 V output swing with ±15 V supplies, as specified in its "Maximum peak output voltage swing" parameter. This capability stems from its Class AB output stage and ±25 mA short-circuit output current rating. For sustained operation, ensure junction temperature stays below 150°C - which requires limiting ambient temperature or adding heatsinking if power dissipation exceeds safe limits.
LM348DR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 4
- Output Type:
- -
- Slew Rate:
- 0.5V/µs
- Gain Bandwidth Product:
- 1 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 30 nA
- Voltage - Input Offset:
- 1 mV
- Current - Supply:
- 2.4mA (x4 Channels)
- Current - Output / Channel:
- 25 mA
- Voltage - Supply Span (Min):
- 8 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
LM348DR FAQ
1.How can I place an order for LM348DR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM348DR 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 LM348DR reliable?
The price and inventory of LM348DR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM348DR is usually 5 days.
3.What payment methods are accepted for LM348DR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM348DR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM348DR?
LM348DR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM348DR 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 LM348DR?
For technical support, including LM348DR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM348DR requirements.
6.How does Aetrix verify that LM348DR is sourced from the original manufacturer or authorized distributors?
All LM348DR 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 LM348DR meets industry standards.
7.What is the process for return or replacement of LM348DR?
All LM348DR units undergo pre-shipment inspection (PSI). If there is an issue with LM348DR, 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 LM348DR part is unused and in its original packaging.
Return procedure for LM348DR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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