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Texas Instruments LM318N/NOPB
- Part No.:
- LM318N/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LM318N/NOPB.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,586
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Product details
Overview
LM318N/NOPB from Texas Instruments is a precision high-speed operational amplifier optimized for wide-bandwidth, fast-settling applications including active filters, A/D converter front-ends, and sample-and-hold circuits. It delivers 15 MHz small-signal bandwidth, 50 V/μs guaranteed slew rate, ±5V to ±20V dual-supply operation, and operates across 0°C to +70°C. Its internal unity-gain compensation enables stable 1× gain operation without external components.
For engineers reviewing the LM318N/NOPB datasheet, LM318N/NOPB pinout, LM318N/NOPB application, or LM318N/NOPB equivalent, key selection criteria include its guaranteed 50 V/μs slew rate at ±15V supplies, 250 nA maximum input bias current at 25°C, 0°C to +70°C temperature rating, and PDIP-8 package compatibility with legacy through-hole layouts.
Technical Context
The LM318N/NOPB uses a compensated bipolar input stage enabling high DC precision while sustaining 15 MHz unity-gain bandwidth. Its architecture supports feedforward compensation in inverting configurations to boost slew rate beyond 150 V/μs and reduce 0.1% settling time to under 1 μs with a single capacitor.
It features input and output overload protection, internal frequency compensation (removing need for external compensation in most cases), and operates with supply voltages as low as ±5V. The device is not rail-to-rail - output swing is ±12 V into 2 kΩ at ±15V supplies, and common-mode input range extends to ±11.5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Small Signal Bandwidth | 15 MHz - enables stable closed-loop operation up to 15 MHz at unity gain, suitable for anti-aliasing and reconstruction filters. |
| Slew Rate | 50 V/μs min - ensures faithful reproduction of fast-rising signals (e.g., 10 V step settles within ~200 ns to 0.1% error). |
| Input Bias Current | 250 nA max at 25°C - low enough for high-impedance sensor interfaces and precision integrators without significant offset drift. |
| Supply Voltage Range | ±5V to ±20V - supports industrial signal conditioning (±15V) and low-voltage embedded systems (±5V) with same part. |
| Operating Temperature | 0°C to +70°C - qualified for commercial-grade instrumentation, test equipment, and data acquisition modules. |
| Input Offset Voltage | 4 mV max at 25°C - enables accurate DC-coupled amplification in multi-stage analog signal chains without trimming. |
| Large Signal Voltage Gain | 25 V/mV min - provides ≥25,000 open-loop gain for precise closed-loop gain accuracy in feedback networks. |
Pinout & Package
LM318N/NOPB is housed in an 8-pin plastic dual-in-line package (PDIP-8), compliant with JEDEC MS-001, with 0.300″ wide body and 0.100″ lead pitch. Pin 1 is identified by a notch or dot; leads are tin-lead free (NIPDAU) and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Offset Null | Connects to external potentiometer for input offset voltage trimming; required only in ultra-precision DC-coupled applications. |
| 2 | Inverting Input (−) | Differential input node; accepts feedback network connection in standard op-amp configurations (inverter, transimpedance). |
| 3 | Non-Inverting Input (+) | Differential input node; used for reference voltage injection, summing, or positive feedback in oscillators. |
| 4 | V− Supply | Negative power rail connection; must be bypassed with 0.1 μF ceramic capacitor near the pin for stability. |
| 5 | Offset Null | Second terminal of offset null potentiometer; paired with Pin 1 to balance input stage mismatch. |
| 6 | Output | Amplified output node; capable of ±12 V swing into 2 kΩ load at ±15V supplies; includes short-circuit protection. |
| 7 | V+ Supply | Positive power rail connection; requires local 0.1 μF ceramic decoupling to suppress supply noise and prevent oscillation. |
| 8 | NC | No connect - internally unused; must remain unconnected per TI design guidelines to avoid parasitic coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Internal Unity-Gain Compensation | Enables stable operation at gain = 1 without external capacitors - reduces BOM count and layout complexity in voltage follower and buffer designs. |
| Feedforward Compensation Support | Allows >150 V/μs slew rate in inverting configurations via external capacitor - critical for high-fidelity pulse amplification and fast DAC output buffering. |
| Input/Output Overload Protection | Prevents latch-up or damage during transient overvoltage or short-circuit events - improves system robustness in industrial environments. |
| Wide Supply Range (±5V to ±20V) | Permits reuse across multiple platforms (e.g., ±5V portable instruments and ±15V lab equipment) without redesigning power rails. |
| 0.1% Settling Time Optimization | Single external capacitor reduces 10 V step settling to <1 μs - meets timing requirements in high-speed data acquisition sampling windows. |
Applications
| Active Filter Design | A/D Converter Front-End |
|---|---|
|
Use Scenario: Implementing 4th-order Butterworth low-pass filter for anti-aliasing prior to 1 MSPS SAR ADC. IC Role / Device Role / Timing Role: High-speed voltage-controlled voltage source (VCVS) in Sallen-Key topology, driving ADC input capacitance directly. Use Value: 15 MHz bandwidth and 50 V/μs slew rate ensure minimal phase distortion and full-scale step fidelity below Nyquist frequency. |
Use Scenario: Buffering and scaling analog sensor output before conversion in a 12-bit data logger. IC Role / Device Role / Timing Role: Precision gain stage with programmable offset correction, interfacing thermocouple amplifier to ADC reference plane. Use Value: 250 nA max input bias current prevents loading of high-Z sensor sources; 4 mV max offset enables sub-LSB DC accuracy. |
| Sample-and-Hold Circuit | Oscillator & Waveform Generation |
|
Use Scenario: Fast acquisition stage in a multiplexed analog input module sampling 16 channels at 100 kSPS. IC Role / Device Role / Timing Role: Hold amplifier with low droop rate and rapid settling (<500 ns) after switch closure. Use Value: Internal overload protection tolerates charge injection from CMOS hold switches; 50 V/μs slew ensures full-scale capture in ≤200 ns. |
Use Scenario: Wein bridge sine wave oscillator generating 10 kHz calibration tone for audio test equipment. IC Role / Device Role / Timing Role: Low-distortion gain element maintaining loop gain >3 with minimal THD across amplitude range. Use Value: High open-loop gain (25 V/mV) and wide bandwidth enable stable oscillation with low harmonic content (<0.5% THD). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM318M/NOPB | SOIC-8 package; identical electrical specs but surface-mount compatible; 0°C to +70°C rating matches LM318N/NOPB. | Used where PCB space constraints or automated assembly require SMT instead of through-hole mounting. | Select LM318M/NOPB when migrating to compact, reflow-compatible layouts without changing circuit performance. |
| TL082CP | JFET-input; 3 MHz bandwidth, 13 V/μs slew rate; higher input impedance (>10¹² Ω) but lower speed and wider offset (10 mV max). | Suitable for lower-frequency, high-Z sensor interfaces (e.g., pH probes), not for >1 MHz signal paths or fast settling. | Choose TL082CP only if input bias current <200 pA is mandatory and bandwidth ≤3 MHz is acceptable. |
Compared with LM318N/NOPB, LM318M/NOPB offers identical AC/DC performance in SOIC-8 for SMT production, while TL082CP trades speed and precision for ultra-low input bias current - making it unsuitable as a drop-in replacement in high-speed applications.
Availability
LM318N/NOPB is available at Aetrix Electronics and suitable for active filter design, A/D converter front-ends, sample-and-hold circuits, oscillator circuits, and precision instrumentation requiring stable component supply across commercial temperature ranges.
Supply support for LM318N/NOPB 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 delivering analog, embedded processing, and connectivity solutions with emphasis on reliability, longevity, and industrial-grade qualification.
The LM318 series was designed specifically for high-speed precision analog signal conditioning - bridging the gap between general-purpose op-amps and specialized video or RF amplifiers in test, measurement, and data acquisition systems.
FAQ
What is the maximum operating temperature range for LM318N/NOPB?
The LM318N/NOPB is specified for operation from 0°C to +70°C ambient temperature. This commercial-grade rating aligns with standard laboratory and industrial control equipment environments. Junction temperature must not exceed 110°C under derated power conditions; thermal resistance is 100°C/W junction-to-ambient in the PDIP-8 package.
Does LM318N/NOPB require external compensation capacitors?
No - LM318N/NOPB includes internal unity-gain frequency compensation, allowing stable operation at gain = 1 without external components. However, external feedforward compensation (e.g., capacitor from output to inverting input) can be added to increase slew rate beyond 150 V/μs in inverting configurations, as documented in Figure 37 of the datasheet.
Can LM318N/NOPB drive capacitive loads directly?
LM318N/NOPB is not optimized for direct capacitive load driving; large capacitive loads (>100 pF) may cause instability or ringing. Figure 40 in the datasheet recommends isolating such loads with a series resistor (e.g., 10–100 Ω) between the output and capacitance to maintain phase margin and prevent oscillation.
What is the purpose of Pins 1 and 5 on LM318N/NOPB?
Pins 1 and 5 are offset null terminals used to connect an external 10 kΩ potentiometer (wiper to V−, ends to Pins 1 and 5) for trimming input offset voltage. This adjustment is optional and only needed in DC-critical applications where 4 mV max offset is insufficient; most AC-coupled or gain >10 designs omit this network.
Is LM318N/NOPB pin-compatible with older LM741-style op-amps?
No - LM318N/NOPB uses an 8-pin PDIP package with offset null pins (1 and 5) and NC pin (8), differing from the 8-pin LM741's pinout (which lacks offset null and has different terminal assignments). Direct substitution would require PCB layout changes; TI explicitly states pin compatibility only with other LM118/LM218/LM318 variants, not generic op-amps.
LM318N/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 70V/µs
- Gain Bandwidth Product:
- 15 MHz
- -3db Bandwidth:
- 15 MHz
- Current - Input Bias:
- 150 nA
- Voltage - Input Offset:
- 4 mV
- Current - Supply:
- 5mA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 10 V
- Voltage - Supply Span (Max):
- 40 V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LM318N/NOPB FAQ
1.How can I place an order for LM318N/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM318N/NOPB 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 LM318N/NOPB reliable?
The price and inventory of LM318N/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM318N/NOPB is usually 5 days.
3.What payment methods are accepted for LM318N/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM318N/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM318N/NOPB?
LM318N/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM318N/NOPB 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 LM318N/NOPB?
For technical support, including LM318N/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM318N/NOPB requirements.
6.How does Aetrix verify that LM318N/NOPB is sourced from the original manufacturer or authorized distributors?
All LM318N/NOPB 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 LM318N/NOPB meets industry standards.
7.What is the process for return or replacement of LM318N/NOPB?
All LM318N/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM318N/NOPB, 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 LM318N/NOPB part is unused and in its original packaging.
Return procedure for LM318N/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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