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Texas Instruments LM248N
- Part No.:
- LM248N
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-DIP (0.300", 7.62mm)
- Datasheet:
-
LM248N.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,930
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Product details
Overview
LM248N from Texas Instruments is a quadruple, independent, high-gain, internally compensated operational amplifier designed for industrial temperature operation (–25°C to 85°C), featuring 6 mV max input offset voltage, 0.6 mA typical supply current per amplifier, and ±12 V common-mode input range with ±15 V supplies. It serves as a drop-in replacement for legacy µA741-based designs in analog signal conditioning, sensor interfacing, and precision DC amplification circuits.
For engineers reviewing the LM248N datasheet, LM248N pinout, LM248N application, or LM248N equivalent, this page delivers verified electrical specs, validated PDIP-14 package details, real-world use cases, and two confirmed alternative parts - all aligned with TI's SLOS058C revision December 2002 specification.
Technical Context
The LM248N implements four fully independent op-amp channels in a single monolithic IC, each with Class AB output stage, internal frequency compensation, and input/output overload protection. Its architecture mirrors the µA741 but improves on bias current (30 nA typ), offset current (4 nA typ), and supply-current efficiency.
It operates over ±4 V to ±18 V dual supplies, supports rail-to-rail input common-mode range up to ±12 V, and delivers ±12 V peak output swing into ≥10 kΩ loads. Unity-gain bandwidth is 1 MHz, slew rate is 0.5 V/µs, and phase margin is 60° - enabling stable closed-loop operation without external compensation.
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 analog rails without derating. |
| Input Offset Voltage (max) | 6 mV at 25°C - enables accurate DC-coupled amplification in sensor front-ends with ≤0.06% initial error. |
| Supply Current (4 amps) | 2.4 mA typ at 25°C - low power consumption suitable for multi-channel industrial modules with thermal constraints. |
| Common-Mode Input Range | ±12 V with ±15 V supplies - allows direct interface to bipolar transducer outputs without level-shifting. |
| Unity-Gain Bandwidth | 1 MHz - sufficient for audio-band filtering, active instrumentation amplifiers, and anti-aliasing stages. |
| Slew Rate | 0.5 V/µs - limits large-signal transient response but ensures stability in unity-gain buffers and integrators. |
| CMRR / PSRR | 70 dB min CMRR, 77 dB min PSRR - provides robust rejection of power supply noise and common-mode interference. |
Pinout & Package
LM248N is housed in a 14-pin plastic dual in-line package (PDIP-N), with 8.0 mm body width, 19.15 mm length, and 5.08 mm max height. Thermal resistance θJA is 80°C/W, supporting moderate-power analog applications without forced cooling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OUT | Amplifier 1 output | Drives feedback network or load; capable of ±25 mA short-circuit current. |
| 1IN– | Amplifier 1 inverting input | Accepts feedback signal; high impedance (0.8 MΩ min) minimizes loading effects. |
| 1IN+ | Amplifier 1 non-inverting input | Receives reference or sensor signal; shares common-mode range with other inputs. |
| VCC+ | Positive supply rail | Connects to +VCC; must be decoupled locally with 0.1 µF ceramic capacitor. |
| 2IN+ | Amplifier 2 non-inverting input | Independent channel input; electrically isolated from other amplifiers on die. |
| 2IN– | Amplifier 2 inverting input | Supports differential configurations; matched to 1IN– for crosstalk <120 dB. |
| 2OUT | Amplifier 2 output | Provides second independent gain stage; identical AC/DC specs to 1OUT. |
| 4OUT | Amplifier 4 output | Final channel output; pin 14 placement simplifies PCB routing in multi-stage designs. |
| 4IN– | Amplifier 4 inverting input | Enables cascaded filter topologies; no internal connection to pins 3, 5, 6, 9, or 11. |
| 4IN+ | Amplifier 4 non-inverting input | Supports summing or reference-biasing functions; same offset and bias specs as other inputs. |
| VCC– | Negative supply rail | Connects to –VCC; requires symmetric decoupling for optimal PSRR performance. |
| 3IN+ | Amplifier 3 non-inverting input | Third channel input; layout symmetry aids thermal matching across all four amplifiers. |
| 3IN– | Amplifier 3 inverting input | Used in transimpedance or current-to-voltage conversion; low input bias current preserves accuracy. |
| 3OUT | Amplifier 3 output | Third independent output; full-spec performance maintained across –25°C to 85°C range. |
Key Features
| Feature | Design Value |
|---|---|
| Four independent op-amps | Enables compact multi-stage analog signal chains (e.g., instrumentation amp + filter + buffer) in one IC. |
| Internal frequency compensation | Eliminates need for external compensation components - reduces BOM count and layout complexity. |
| Input/output overload protection | Prevents latch-up or damage during transient overvoltage events at inputs or shorts at outputs. |
| Class AB output stage | Delivers low crossover distortion and improved linearity vs. Class A, critical for precision DC and audio paths. |
| Interchangeable with LM148/LM348 | Same pinout and functional behavior across temperature grades - simplifies design reuse and qualification. |
Applications
| Industrial Sensor Signal Conditioning | Legacy µA741 System Upgrade |
|---|---|
|
Use Scenario: Amplifying low-level mV outputs from RTDs, strain gauges, or thermocouples in PLC analog input modules. IC Role / Device Role / Timing Role: Precision DC-coupled gain stage with low input offset and bias current to preserve measurement accuracy. Use Value: 6 mV max VIO and 4 nA typ IIO minimize zero-point drift and calibration burden across –25°C to 85°C operating range. |
Use Scenario: Replacing obsolete µA741 quad designs in field-deployed test equipment requiring extended temperature support. IC Role / Device Role / Timing Role: Pin-compatible drop-in upgrade delivering lower supply current (2.4 mA vs. ~5 mA) and improved CMRR. Use Value: Maintains existing PCB layout while reducing system power by >40% and improving noise immunity via 70 dB min CMRR. |
| Multi-Channel Active Filtering | Industrial Process Controller I/O |
|
Use Scenario: Implementing 4-pole low-pass filters in motor drive current sensing or power quality analyzers. IC Role / Device Role / Timing Role: Four independent unity-gain stable amplifiers configured as Sallen-Key or multiple-feedback stages. Use Value: 1 MHz GBW and 60° phase margin ensure predictable roll-off without peaking; PDIP-14 footprint eases prototyping. |
Use Scenario: Providing isolated analog output drivers (0–10 V / 4–20 mA) and feedback monitoring in HVAC or pump controllers. IC Role / Device Role / Timing Role: Simultaneous voltage buffering, current sinking, and loop diagnostics using all four amplifiers. Use Value: ±25 mA short-circuit output capability and input overload protection increase field reliability under wiring fault conditions. |
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 | Commercial temperature range (0°C to 70°C); otherwise identical pinout, electrical specs, and package. | Not rated for industrial ambient extremes; unsuitable where cabinet temperatures exceed 70°C. | Select LM348N only for cost-sensitive consumer or lab-grade equipment with controlled environments. |
| LM248D | SOIC-14 package (3.9 mm width); same –25°C to 85°C rating and electrical performance as LM248N. | Requires PCB redesign for surface-mount assembly; offers better thermal dissipation (θJA = 86°C/W). | Choose LM248D for space-constrained industrial boards needing automated assembly and improved power density. |
Compared with LM348N and LM248D, the LM248N uniquely combines industrial temperature rating, through-hole PDIP-14 compatibility, and proven legacy interoperability - making it the optimal choice for retrofitting, prototyping, and medium-volume industrial control hardware.
Availability
LM248N is available at Aetrix Electronics and suitable for industrial sensor interfaces, legacy system upgrades, and multi-channel analog signal processing requiring stable component supply across extended temperature ranges.
Supply support for LM248N 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 digital signal technologies, with over 50 years of op-amp innovation.
The LM248N belongs to TI's legacy general-purpose op-amp family, engineered for industrial-grade reliability, backward compatibility with µA741 designs, and ease of integration into analog signal chains.
FAQ
What is the maximum operating temperature range for the LM248N?
The LM248N is specified for operation from –25°C to +85°C ambient temperature. This industrial temperature grade exceeds the commercial-range LM348N (0°C to 70°C) and supports deployment in control cabinets, motor drives, and outdoor instrumentation where thermal margins are critical. The device maintains full electrical performance across this range, including 6 mV max input offset voltage and 70 dB min CMRR.
Is the LM248N pin-compatible with the LM348N?
Yes, the LM248N is fully pin-compatible with the LM348N - both use the same 14-pin PDIP (N) package and identical pinout per TI's SLOS058C datasheet. Electrical specifications differ only in temperature rating (LM248N: –25°C to 85°C; LM348N: 0°C to 70°C) and input offset voltage limit (both 6 mV max at 25°C). No PCB changes are required when substituting LM248N for LM348N in existing designs.
Does the LM248N require external compensation capacitors?
No, the LM248N features internal frequency compensation and is unity-gain stable without external components. Its 1 MHz unity-gain bandwidth and 60° phase margin are guaranteed across the full operating temperature and supply range. External compensation is unnecessary for standard inverting, non-inverting, or voltage-follower configurations - simplifying design and reducing bill-of-materials cost.
What is the typical supply current for the LM248N at 25°C?
The LM248N draws 2.4 mA typical supply current for all four amplifiers combined at 25°C with no load and ±15 V supplies. Per-amplifier current is approximately 0.6 mA, matching the µA741's efficiency while delivering improved input bias and offset performance. This low quiescent current supports multi-channel analog systems where thermal management and power budgeting are key constraints.
Can the LM248N drive a 2 kΩ load effectively?
Yes, the LM248N delivers ±10 V peak output swing into a 2 kΩ load at 25°C, meeting standard line-driving requirements for analog outputs. Its Class AB output stage provides ±25 mA short-circuit current capability, ensuring robustness against transient overloads. For sustained 2 kΩ loading, thermal considerations should account for 80°C/W θJA in the PDIP-14 package to maintain junction temperature below 150°C.
LM248N Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- 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:
- 2.4mA (x4 Channels)
- Current - Output / Channel:
- 25 mA
- Voltage - Supply Span (Min):
- 8 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -25°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 14-PDIP
LM248N FAQ
1.How can I place an order for LM248N through Aetrix?
Please submit a Request for Quotation (RFQ) for LM248N 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 LM248N reliable?
The price and inventory of LM248N are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM248N is usually 5 days.
3.What payment methods are accepted for LM248N?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM248N transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM248N?
LM248N orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM248N 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 LM248N?
For technical support, including LM248N datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM248N requirements.
6.How does Aetrix verify that LM248N is sourced from the original manufacturer or authorized distributors?
All LM248N 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 LM248N meets industry standards.
7.What is the process for return or replacement of LM248N?
All LM248N units undergo pre-shipment inspection (PSI). If there is an issue with LM248N, 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 LM248N part is unused and in its original packaging.
Return procedure for LM248N:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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