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Texas Instruments LM348D
- Part No.:
- LM348D
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM348D.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,213
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Product details
Overview
LM348D from Texas Instruments is a quad, independent, high-gain, internally compensated operational amplifier in SOIC-14 package, designed for general-purpose analog signal conditioning. It delivers 0.6 mA typical supply current per amplifier, 6 mV maximum input offset voltage at 25°C, and ±12 V common-mode input range under ±15 V supplies - used in industrial sensor signal amplification, legacy instrumentation front-ends, and multi-channel DC-coupled gain stages.
For engineers reviewing the LM348D datasheet, LM348D pinout, LM348D application, or LM348D equivalent, this page provides verified electrical parameters, SOIC-14 terminal mapping, real-world use cases, and validated alternative options aligned with TI's SLOS058C specification and ordering documentation.
Technical Context
The LM348D implements four independent Class AB output stages with internal frequency compensation, enabling stable unity-gain operation without external components. Its input stage uses matched bipolar transistors to achieve low input offset voltage (≤6 mV) and low input offset current (≤50 nA), supporting precision DC-coupled applications.
It features input/output overload protection and operates across 0°C to 70°C ambient temperature with ±4 V to ±18 V dual-supply capability. The device is explicitly designed to be interchangeable with industry-standard LM148 and LM248 in functionally equivalent circuits where temperature range and offset specifications align.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | ±4 V to ±18 V - supports standard ±5 V, ±12 V, and ±15 V dual-rail systems without derating. |
| Input Offset Voltage (max) | 6 mV at 25°C - sets worst-case DC error floor in precision gain stages and summing amplifiers. |
| Supply Current (typ, per amp) | 0.6 mA - enables low-power multi-amplifier designs with predictable thermal load in SOIC-14 packages. |
| Unity-Gain Bandwidth | 1 MHz - sufficient for audio-band and low-speed control-loop applications up to ~100 kHz closed-loop bandwidth. |
| Slew Rate | 0.5 V/µs - limits large-signal transient response; suitable for <10 kHz full-power sine wave output into 2 kΩ. |
| Common-Mode Input Range | ±12 V (at ±15 V supply) - allows rail-to-rail input operation within 3 V of either supply, easing biasing in single-supply derived rails. |
| Output Short-Circuit Duration | Unlimited - permits safe operation in fault-prone environments without external current limiting. |
Pinout & Package
LM348D is housed in a 14-pin SOIC (Small Outline Integrated Circuit) package with 1.27 mm pitch, JEDEC MS-012 compliant footprint, and RoHS-compliant NiPdAu lead finish. Thermal resistance θJA is 86°C/W, supporting continuous operation at ≤70°C ambient with moderate power dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Amplifier 1 Output | Class AB buffered output capable of ±25 mA short-circuit current; drives 2 kΩ loads to ±10 V swing. |
| 2 | Amplifier 1 Inverting Input | Differential input node with 0.8–2.5 MΩ input resistance; requires matched source impedances to minimize offset drift. |
| 3 | Amplifier 1 Non-Inverting Input | High-impedance input referenced to common-mode range; used for positive feedback or reference biasing. |
| 4 | Positive Supply (VCC+) | Connects to +V rail; must be decoupled locally with 0.1 µF ceramic capacitor to ground for stability. |
| 5 | Amplifier 2 Non-Inverting Input | Independent input for second op-amp channel; electrically isolated from other amplifiers on die. |
| 6 | Amplifier 2 Inverting Input | Matches Pin 2 characteristics; supports differential or inverting configurations without crosstalk penalty. |
| 7 | Amplifier 2 Output | Identical output drive capability to Pin 1; VO1/VO2 crosstalk attenuation ≥120 dB at 1 Hz–20 kHz. |
| 8 | Amplifier 3 Output | Third independent output; shares same process and layout symmetry as Pins 1 and 7 for matched performance. |
| 9 | Amplifier 3 Inverting Input | Matches Pin 2/6; enables three-channel simultaneous signal conditioning with minimal inter-channel coupling. |
| 10 | Amplifier 3 Non-Inverting Input | Provides third high-Z input path; usable for reference buffering or active filter sections. |
| 11 | Negative Supply (VCC–) | Connects to –V rail; local 0.1 µF decoupling required to suppress ground bounce and supply noise coupling. |
| 12 | Amplifier 4 Non-Inverting Input | Fourth independent input; completes quad functionality for multi-sensor or multi-stage analog processing. |
| 13 | Amplifier 4 Inverting Input | Final differential input node; maintains same input bias current (≤200 nA typ) and offset specs as other channels. |
| 14 | Amplifier 4 Output | Full-output capability matching Pins 1/7/8; enables four parallel gain paths or cascaded filtering topologies. |
Key Features
| Feature | Design Value |
|---|---|
| Quad independent amplifiers | Four fully isolated op-amps in one SOIC-14 package reduce board area and interconnect complexity in multi-channel systems. |
| Internally compensated | Stable unity-gain operation without external compensation components - simplifies design and improves production yield. |
| Input/Output overload protection | Prevents latch-up or permanent damage during overvoltage, reverse polarity, or short-circuit events in field-deployed equipment. |
| Low supply-current drain | 0.6 mA per amplifier enables battery-powered or thermally constrained applications with predictable quiescent power budget. |
| Interchangeable with LM148/LM248 | Pin-compatible and functionally equivalent to LM148 (–55°C to 125°C) and LM248 (–25°C to 85°C) when operating within LM348D's 0°C to 70°C range. |
Applications
| Industrial Sensor Signal Conditioning | Legacy Instrumentation Front-Ends |
|---|---|
|
Use Scenario: Amplifying low-level mV outputs from RTDs, strain gauges, and thermocouples in PLC analog input modules. IC Role / Device Role / Timing Role: Quad op-amp provides simultaneous gain, filtering, and level-shifting for four independent sensor channels. Use Value: 6 mV max VIO ensures sub-0.1% gain error in 100× amplification stages; SOIC-14 footprint supports dense I/O card layouts. |
Use Scenario: Replacing aging µA741-based circuits in calibrated benchtop multimeters and oscilloscope vertical amplifiers. IC Role / Device Role / Timing Role: Drop-in functional replacement delivering identical transfer function and stability margins as original design. Use Value: Internally compensated architecture eliminates need for redesign or compensation capacitor changes during upgrade. |
| Multi-Channel DC-Coupled Gain Stages | Audio-Band Active Filters |
|
Use Scenario: Implementing four parallel non-inverting amplifiers in automated test equipment for simultaneous DUT signal routing. IC Role / Device Role / Timing Role: Independent amplifiers isolate signal paths while sharing common supply rails and PCB area. Use Value: 120 dB crosstalk attenuation prevents inter-channel interference in precision measurement systems requiring >80 dB dynamic range. |
Use Scenario: Building 4-pole low-pass filters for anti-aliasing in 24-bit audio ADC interfaces with cutoff at 20 kHz. IC Role / Device Role / Timing Role: Each amplifier configures one filter stage (Sallen-Key or multiple-feedback topology). Use Value: 1 MHz unity-gain bandwidth supports Butterworth response with <0.1 dB passband ripple up to 15 kHz. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM324DR | Single-supply rated (3 V to 32 V), lower VIO (7 mV max), higher input bias current (200 nA typ), no dual-supply symmetry. | Preferred for battery-powered or 3.3 V/5 V microcontroller-adjacent signal chains; not suitable for precision bipolar-signal conditioning. | Select LM324DR only when operating from single-ended supplies and DC accuracy requirements permit higher offset. |
| TL084CDR | JFET-input (50 pA IB), higher slew rate (13 V/µs), wider bandwidth (3 MHz), but higher VIO (10 mV max) and no overload protection. | Better for high-frequency AC-coupled applications like tone control or wideband preamps; unsuitable for DC-critical sensor front-ends. | Choose TL084CDR when input impedance >1012 Ω or slew-limited distortion must be minimized above 10 kHz. |
Compared with LM348D, LM324DR offers single-supply convenience at the cost of bipolar-signal fidelity, while TL084CDR trades robustness and DC precision for speed and input impedance - making LM348D optimal for legacy-replacement and industrial DC signal integrity tasks.
Availability
LM348D is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, legacy instrumentation front-ends, and multi-channel DC-coupled gain stages requiring stable component supply across extended production lifecycles.
Supply support for LM348D 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 founded in 1930, specializing in analog ICs, embedded processors, and educational technology with broad industrial and automotive portfolio coverage.
The LM348D belongs to TI's legacy linear amplifier product line, engineered for backward compatibility with µA741-based designs and long-term availability in industrial control and test equipment.
FAQ
What is the maximum operating temperature range for the LM348D?
The LM348D is specified for operation from 0°C to +70°C ambient temperature, as confirmed in the TI SLOS058C datasheet ordering table and recommended operating conditions section. This range applies to all LM348 variants in SOIC (D), PDIP (N), and SOP (NS) packages. Exceeding 70°C ambient may cause parametric shift beyond guaranteed limits, particularly in input offset voltage and supply current.
Does the LM348D require external compensation capacitors?
No, the LM348D does not require external compensation capacitors because it features internal frequency compensation optimized for stable unity-gain operation. This is explicitly stated in the "description/ordering information" section of the SLOS058C datasheet and verified by its 1 MHz unity-gain bandwidth and 60° phase margin under standard test conditions.
Is the LM348D pin-compatible with the LM324 series?
No, the LM348D is not pin-compatible with the LM324 series. LM348D uses a dual-supply SOIC-14 pinout with dedicated VCC+ (Pin 4) and VCC– (Pin 11), whereas LM324 is single-supply SOIC-14 with VCC (Pin 4) and GND (Pin 11). Their internal amplifier channel assignments and supply configurations differ fundamentally, requiring PCB layout changes for substitution.
What is the typical supply current consumption of the LM348D?
The LM348D draws 0.6 mA typical supply current per amplifier at 25°C with no load, totaling 2.4 mA for all four amplifiers - as measured under VCC± = ±15 V in the SLOS058C electrical characteristics table. This value remains stable across the full 0°C to 70°C operating range, with maximum total ICC of 4.5 mA under worst-case conditions.
Can the LM348D drive a 2 kΩ load to ±10 V output swing?
Yes, the LM348D can drive a 2 kΩ load to ±10 V output swing, as confirmed by the "Maximum peak output voltage swing" specification in the SLOS058C datasheet: ±10 V min at RL = 2 kΩ and TA = 25°C. This performance holds across the full 0°C to 70°C range, enabling reliable operation in precision gain stages with moderate load demands.
LM348D Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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
LM348D FAQ
1.How can I place an order for LM348D through Aetrix?
Please submit a Request for Quotation (RFQ) for LM348D 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 LM348D reliable?
The price and inventory of LM348D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM348D is usually 5 days.
3.What payment methods are accepted for LM348D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM348D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM348D?
LM348D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM348D 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 LM348D?
For technical support, including LM348D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM348D requirements.
6.How does Aetrix verify that LM348D is sourced from the original manufacturer or authorized distributors?
All LM348D 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 LM348D meets industry standards.
7.What is the process for return or replacement of LM348D?
All LM348D units undergo pre-shipment inspection (PSI). If there is an issue with LM348D, 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 LM348D part is unused and in its original packaging.
Return procedure for LM348D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM348D Tags
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LM358DR
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