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STMicroelectronics LM248DT
- Part No.:
- LM248DT
- Manufacturer:
- STMicroelectronics
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM248DT.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,372
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Product details
Overview
LM248DT from STMicroelectronics is a quad bipolar operational amplifier with pin compatibility to LM124/LM224/LM324, designed for high-density analog signal conditioning in industrial and instrumentation systems. It delivers 1.3 MHz gain-bandwidth product, 1 mV input offset voltage, 2 nA input offset current, and operates across –40 °C to +105 °C in SO14 package.
For engineers reviewing the LM248DT datasheet, LM248DT pinout, LM248DT application, or LM248DT equivalent, key selection criteria include supply current per amplifier (0.53 mA), channel isolation (120 dB), class AB output stage (crossover distortion–free), and thermal stability across extended temperature range.
Technical Context
The LM248DT integrates four independent, internally compensated op-amps sharing a common ±22 V supply rail. Each amplifier features independently biased circuitry and layout-optimized thermal isolation to maintain channel separation at 120 dB and minimize inter-channel crosstalk in multi-stage filtering or sensor signal chains.
Its class AB output stage ensures linear swing from ±12 V input common-mode range to ±13 V output swing (RL ≥ 10 kΩ) under ±15 V supply, while low 30 nA input bias current and 0.25 V/μs slew rate support precision DC-coupled amplification and moderate-speed signal buffering without phase reversal risk.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain bandwidth product | 1.3 MHz - sets usable small-signal bandwidth for unity-gain stable configurations up to ~1.3 MHz |
| Input offset voltage | 1 mV (typ) - enables accurate DC amplification with ≤0.1% error in 1 V full-scale 100× gain stages |
| Supply current per amp | 0.53 mA - allows four channels to operate within 2.1 mA total, matching single UA741 consumption |
| Channel separation | 120 dB - suppresses inter-amplifier coupling in multi-channel data acquisition front-ends |
| Input bias current | 30 nA (typ) - minimizes voltage error across high-impedance sensor interfaces (e.g., thermistors, photodiodes) |
| Output voltage swing | ±13 V (RL ≥ 10 kΩ) - supports rail-to-rail compatible signal handling with ±15 V supplies |
| Common-mode rejection | 110 dB (typ) - rejects shared noise in differential sensor bridges and instrumentation amplifier inputs |
Pinout & Package
LM248DT is housed in a 14-pin Small Outline (SO14) package, 8.75 mm × 4.00 mm body size, 1.27 mm pitch, with gull-wing leads suitable for surface-mount reflow assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Output A | Amplifier A output; capable of sourcing/sinking ≥10 mA into 2 kΩ load |
| 2 | Inverting input A | Differential input node for Amp A; 0.8–2.5 MΩ input resistance |
| 3 | Non-inverting input A | Differential input node for Amp A; matched to Pin 2 for common-mode operation |
| 4 | VCC– | Negative supply rail; accepts –22 V absolute max; shared by all four amplifiers |
| 5 | Non-inverting input B | Differential input node for Amp B; electrically isolated from other channels |
| 6 | Inverting input B | Differential input node for Amp B; independent biasing prevents thermal drift coupling |
| 7 | Output B | Amplifier B output; identical drive capability and voltage swing to Pin 1 |
| 8 | Output C | Amplifier C output; shares same SO14 thermal pad constraints as Pins 1 and 7 |
| 9 | Inverting input C | Differential input node for Amp C; layout-isolated to preserve 120 dB channel separation |
| 10 | Non-inverting input C | Differential input node for Amp C; matched pair with Pin 9 for balanced sensing |
| 11 | VCC+ | Positive supply rail; accepts +22 V absolute max; shared by all four amplifiers |
| 12 | Non-inverting input D | Differential input node for Amp D; referenced to same ground plane as other inputs |
| 13 | Inverting input D | Differential input node for Amp D; independent input stage reduces inter-channel leakage |
| 14 | Output D | Amplifier D output; fully functional with same AC/DC specs as Pins 1, 7, and 8 |
Key Features
| Feature | Design Value |
|---|---|
| Class AB output stage | Eliminates crossover distortion in audio and precision analog output stages without external compensation |
| Independent amplifier biasing | Maintains 120 dB channel separation across –40 °C to +105 °C via thermally decoupled quiescent current sources |
| Low input offset current | 2 nA (typ) enables use with high-Z sources (e.g., pH electrodes, piezoelectric sensors) without significant offset drift |
| Pin-compatible upgrade path | Direct replacement for LM124/LM224/LM324 in existing SO14 footprints without PCB redesign |
| Overload protection | Input and output stages withstand indefinite short-to-ground events without latch-up or parametric shift |
Applications
| Industrial Sensor Signal Conditioning | Multi-Channel Data Acquisition Front-End |
|---|---|
Use Scenario: Amplifying low-level outputs from RTDs, strain gauges, or 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: 120 dB channel separation prevents cross-talk between adjacent 4–20 mA loop signals; 1 mV offset ensures ≤0.01% measurement error at 100× gain. | Use Scenario: Building compact 4-channel ADC driver circuits for portable test equipment with space-constrained PCBs. IC Role / Device Role / Timing Role: Each amplifier buffers and drives one ADC input while rejecting common-mode noise from shared power rails. Use Value: 0.53 mA per amplifier enables full 4-channel operation within 2.1 mA total supply budget-critical for battery-powered designs. |
| Instrumentation Amplifier Input Stage | Active Filter Bank for Audio Monitoring |
Use Scenario: Serving as matched input buffers in three-op-amp instrumentation amplifier topologies for medical ECG front-ends. IC Role / Device Role / Timing Role: Two amplifiers form the input differential pair; third provides reference buffer; fourth handles post-filtering. Use Value: Matched input bias currents (30 nA typ) and offset voltages (1 mV typ) minimize common-mode to differential conversion errors. | Use Scenario: Implementing four independent 2nd-order low-pass filters in broadcast audio analyzers for harmonic distortion analysis. IC Role / Device Role / Timing Role: Each amplifier configures as Sallen-Key topology with 1.3 MHz GBP supporting cutoff frequencies up to 100 kHz. Use Value: Class AB output stage delivers clean 0.08% THD at 1 kHz, enabling accurate spectral purity assessment below –60 dBc. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad bipolar operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM348DT | Same electrical specs but rated for 0 °C to +70 °C only; lower thermal robustness | Suitable for commercial-grade equipment (e.g., benchtop lab instruments) without extended ambient requirements | Select when operating temperature stays within 0–70 °C and cost sensitivity outweighs industrial temp grade |
| TL084CDR | JFET-input architecture; higher GBP (3 MHz), higher input impedance (1012 Ω), but 15 mV offset and no extended temp rating | Better for high-Z source interfacing (e.g., electret mics), but unsuitable for precision DC-coupled sensor amps | Choose only if input impedance >1 MΩ is mandatory and offset tolerance >10× looser than LM248DT's 1 mV spec |
Compared with LM348DT and TL084CDR, LM248DT uniquely combines industrial temperature range (–40 °C to +105 °C), ultra-low input offset (1 mV), and quad-channel matching in SO14-making it optimal for ruggedized sensor signal chains where thermal stability and DC accuracy are non-negotiable.
Availability
LM248DT is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, multi-channel data acquisition front-ends, instrumentation amplifier input stages, and active filter banks requiring stable component supply across extended temperature ranges.
Supply support for LM248DT 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, delivering silicon solutions for automotive, industrial, and consumer markets since 1987.
The LM248DT belongs to ST's precision analog op-amp product line, engineered specifically for high-reliability industrial instrumentation where extended temperature operation, channel matching, and long-term parametric stability are critical design requirements.
FAQ
What is the maximum supply voltage for LM248DT?
The LM248DT supports ±22 V DC supply voltage per rail, meaning total supply span can reach 44 V. Operation beyond this risks permanent damage to internal junctions. Absolute maximum ratings assume symmetrical supplies; asymmetric configurations (e.g., +15 V/–5 V) must ensure neither rail exceeds ±22 V relative to ground.
Does LM248DT require external compensation capacitors?
No. The LM248DT is internally compensated for unity-gain stability across its full operating temperature range. Adding external compensation capacitors is unnecessary and may degrade phase margin or bandwidth. Its 1.3 MHz gain-bandwidth product is specified under standard test conditions with no external components.
Can LM248DT drive capacitive loads directly?
Yes, but with limitations. The LM248DT can safely drive up to 100 pF without oscillation under unity-gain configuration, as verified in the datasheet's slew rate test (CL = 100 pF). For loads >100 pF, a series resistor (≥100 Ω) between output and capacitance is required to maintain stability and prevent ringing.
How does LM248DT handle input overvoltage conditions?
The LM248DT includes built-in input overload protection: both inputs tolerate indefinite short-circuit to either supply rail or ground without damage. This protection is implemented via internal clamping diodes and current-limiting structures, allowing safe operation in noisy industrial environments where transient spikes or wiring faults may occur.
LM248DT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- 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:
- 1.3 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:
- -40°C ~ 105°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SO
LM248DT FAQ
1.How can I place an order for LM248DT through Aetrix?
Please submit a Request for Quotation (RFQ) for LM248DT 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 LM248DT reliable?
The price and inventory of LM248DT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM248DT is usually 5 days.
3.What payment methods are accepted for LM248DT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM248DT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM248DT?
LM248DT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM248DT 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 LM248DT?
For technical support, including LM248DT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM248DT requirements.
6.How does Aetrix verify that LM248DT is sourced from the original manufacturer or authorized distributors?
All LM248DT 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 LM248DT meets industry standards.
7.What is the process for return or replacement of LM248DT?
All LM248DT units undergo pre-shipment inspection (PSI). If there is an issue with LM248DT, 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 LM248DT part is unused and in its original packaging.
Return procedure for LM248DT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM248DT Tags
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