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Texas Instruments LM318MX/NOPB
- Part No.:
- LM318MX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM318MX/NOPB.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:8,918
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Product details
Overview
LM318MX/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 slew rate, ±5V to ±20V dual-supply operation, and operates across 0°C to +70°C. Its internal unity-gain compensation enables stable operation without external components.
For engineers reviewing the LM318MX/NOPB datasheet, LM318MX/NOPB pinout, LM318MX/NOPB application, or LM318MX/NOPB equivalent, key selection criteria include guaranteed slew rate, input bias current (≤500 nA), temperature range compliance, SOIC-8 thermal performance, and compatibility with feedforward compensation for inverting configurations.
Technical Context
The LM318MX/NOPB uses internally compensated bipolar architecture with unity-gain-stable design, enabling immediate use in non-inverting configurations without external components. Its input stage features overload protection and shunted back-to-back diodes limiting differential input voltage to ≤1 V without series resistance.
It supports feedforward compensation for inverting amplifiers to achieve >150 V/μs slew rate and near-doubled bandwidth, while overcompensation allows enhanced phase margin when full bandwidth is unnecessary. A single capacitor can reduce 0.1% settling time to under 1 μs for 10 V step changes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Small Signal Bandwidth | 15 MHz - Enables stable closed-loop gain up to 10× at 1.5 MHz or unity gain at 15 MHz. |
| Slew Rate | 50 V/μs min - Supports 10 V output transitions in ≤200 ns without distortion in unity-gain follower. |
| Input Bias Current | ≤500 nA max at 25°C - Minimizes DC error in high-impedance sensor interfaces and integrators. |
| Supply Voltage Range | ±5 V to ±20 V - Compatible with industrial ±12 V, ±15 V, and low-voltage ±5 V systems. |
| Operating Temperature | 0°C to +70°C - Qualified for commercial-grade embedded control and instrumentation. |
| Input Offset Voltage | ≤10 mV max - Limits initial DC error in precision gain stages without trimming. |
| Large Signal Voltage Gain | ≥25 V/mV - Ensures ≥25,000 open-loop gain for <0.04% closed-loop error at G = 100. |
Pinout & Package
LM318MX/NOPB is packaged in an 8-pin SOIC (Package Drawing D, JEDEC MS-012 variation AA), 3.91 mm body width, 1.75 mm max height, with gull-wing leads and RoHS-compliant matte tin (Sn) lead finish. Thermal resistance θJA is 100°C/W (junction-to-ambient, DIP-equivalent).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Inverting Input (−) | Differential input node | Accepts feedback network connection; requires ≤1 V differential voltage vs. non-inverting input to avoid diode conduction. |
| Non-Inverting Input (+) | Differential input node | Reference point for common-mode signals; input voltage range extends to ±11.5 V with ±15 V supplies. |
| Output | Amplified signal source | Drives ≥2 kΩ loads to ±12 V swing; includes short-circuit protection and thermal shutdown. |
| Positive Supply (V+) | Power rail | Connects to +VS; requires 0.1 μF ceramic bypass capacitor to ground within 1 cm. |
| Negative Supply (V−) | Power rail | Connects to −VS; same bypassing requirement as V+ for stability and noise rejection. |
| Offset Null 1 | Trim terminal | Used with external potentiometer (10 kΩ) between pins 1 and 5 to null input offset voltage. |
| Offset Null 2 | Trim terminal | Completes offset nulling circuit; unused pins must be left unconnected or tied to ground via resistor. |
| No Connect | Reserved | Pin 8 is not bonded internally; must remain unconnected per TI design guidance. |
Key Features
| Feature | Design Value |
|---|---|
| Internal unity-gain compensation | Eliminates need for external compensation capacitors in standard non-inverting configurations, reducing BOM count and layout complexity. |
| Feedforward compensation support | Enables >150 V/μs slew rate in inverting topologies using a single capacitor, improving transient response in DAC buffers and pulse amplifiers. |
| Input/output overload protection | Prevents latch-up and damage during overvoltage or short-circuit events, supporting robust operation in test equipment and industrial I/O. |
| Pin compatibility with general-purpose op amps | SOIC-8 footprint matches LM741, TL081, and similar legacy devices, easing drop-in upgrades in existing designs. |
| 0.1% settling time optimization | A single external capacitor reduces 10 V step settling to <1 μs, critical for high-speed data acquisition and multiplexed analog front-ends. |
Applications
| Active Filter Design | A/D Converter Driver |
|---|---|
Use Scenario: Second-order Sallen-Key low-pass filter operating at 1 MHz cutoff with <0.1 dB passband ripple. IC Role / Device Role / Timing Role: High-speed voltage-controlled voltage source providing precise gain and phase margin control. Use Value: 15 MHz bandwidth ensures minimal group delay distortion; 50 V/μs slew rate prevents slew-induced harmonic generation at full-scale input steps. | Use Scenario: Driving SAR ADC input with 12-bit resolution and 1 MSPS sampling rate. IC Role / Device Role / Timing Role: Track-and-hold buffer isolating ADC from source impedance and minimizing aperture uncertainty. Use Value: <1 μs 0.1% settling time guarantees accurate sampling of 10 V step inputs; ±12 V output swing matches typical ADC reference rails. |
| Sample-and-Hold Circuit | Oscillator Core |
Use Scenario: Precision hold stage capturing 10 V analog signals with <10 ppm droop over 100 μs hold time. IC Role / Device Role / Timing Role: Unity-gain follower with low input bias current minimizing hold capacitor discharge. Use Value: ≤500 nA input bias current limits droop to <0.5 mV/100 μs on 10 nF hold capacitor; overload protection prevents latch-up during switching transients. | Use Scenario: Wein bridge sine wave oscillator generating 100 kHz low-distortion output for calibration sources. IC Role / Device Role / Timing Role: Amplifier sustaining oscillation with amplitude stabilization via nonlinear feedback. Use Value: High open-loop gain (>25 V/mV) ensures reliable startup; 15 MHz bandwidth supports clean 100 kHz fundamental with minimal harmonic content. |
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 |
|---|---|---|---|
| LM318N/NOPB | Same electrical specs but in PDIP-8 package; higher θJA (100°C/W vs. SOIC-8's 100°C/W nominal, but lower power density tolerance). | Preferred for prototyping or through-hole assembly; less suitable for high-density PCBs or automated SMT lines. | Select LM318N/NOPB only when manual soldering or breadboard evaluation is required. |
| TL081CP | Lower slew rate (13 V/μs), 3 MHz GBW, JFET input (50 pA bias current), no offset null pins. | Better for low-noise, high-Z sensor interfaces; unsuitable for >100 kHz active filters or fast-settling drivers. | Choose TL081CP where ultra-low input current outweighs speed requirements; avoid for LM318MX/NOPB-replacement in timing-critical paths. |
Compared with LM318N/NOPB, LM318MX/NOPB offers identical AC/DC performance in a smaller, surface-mount package with superior reflow compatibility and board space efficiency; versus TL081CP, it provides 3.8× higher slew rate and 5× greater bandwidth at the cost of higher input bias current-making it optimal for speed-constrained, not current-constrained, signal conditioning.
Availability
LM318MX/NOPB is available at Aetrix Electronics and suitable for active filter design, A/D converter driver stages, sample-and-hold circuits, and oscillator core implementations requiring stable component supply and commercial-temperature-grade performance.
Supply support for LM318MX/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 for industrial, automotive, and consumer markets.
The LM318 series belongs to TI's precision high-speed op amp product line, engineered specifically for applications demanding both wide bandwidth and fast settling-such as data acquisition, test equipment, and real-time signal processing.
FAQ
What is the maximum supply voltage rating for LM318MX/NOPB?
The LM318MX/NOPB has an absolute maximum supply voltage rating of ±20 V. Operation beyond this limit risks permanent damage. For reliable long-term use, TI recommends staying within ±18 V under normal conditions, especially at elevated ambient temperatures where junction temperature must remain below 110°C. The device draws 5–10 mA quiescent current, so thermal dissipation must be verified in high-voltage, high-output-swing applications.
Does LM318MX/NOPB require external compensation capacitors?
No, LM318MX/NOPB features internal unity-gain frequency compensation and operates stably in standard non-inverting configurations without external components. However, external feedforward compensation is supported for inverting amplifiers to boost slew rate above 150 V/μs, and overcompensation capacitors may be added to improve phase margin when maximum bandwidth is not required. Pin 1 and pin 5 provide offset null access but are unrelated to compensation.
What is the purpose of pins 1 and 5 on LM318MX/NOPB?
Pins 1 and 5 on LM318MX/NOPB are offset null terminals used to minimize input offset voltage via an external 10 kΩ potentiometer connected between them, with the wiper grounded. This adjustment reduces initial DC error in precision DC-coupled applications such as instrumentation amplifiers or precision integrators. These pins are not used for frequency compensation or power supply decoupling and must remain unconnected if offset trimming is unnecessary.
Can LM318MX/NOPB drive capacitive loads directly?
LM318MX/NOPB is not optimized for direct driving of large capacitive loads (>100 pF) without isolation. Figure 40 in the TI datasheet recommends inserting a small series resistor (e.g., 10–50 Ω) between the output and capacitive load to maintain stability. Uncompensated capacitive loading can cause peaking, ringing, or oscillation due to phase shift introduced by the load capacitance interacting with the op amp's output impedance. For >500 pF loads, consider adding a dedicated output isolation stage or using a buffer with higher capacitive drive capability.
Is LM318MX/NOPB pin-compatible with LM741 or TL081?
LM318MX/NOPB is pin-compatible with LM741 and TL081 in the SOIC-8 (D) package variant, sharing identical pin 1–8 assignments: inverting input, non-inverting input, output, V−, V+, offset null 1, offset null 2, and NC. However, functional differences-including 15 MHz bandwidth vs. 1 MHz (LM741) or 3 MHz (TL081), and 50 V/μs slew rate vs. 0.5 V/μs or 13 V/μs-require careful review of loop stability, settling behavior, and power dissipation before substitution. No PCB changes are needed, but system-level validation is essential.
LM318MX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LM318MX/NOPB FAQ
1.How can I place an order for LM318MX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM318MX/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 LM318MX/NOPB reliable?
The price and inventory of LM318MX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM318MX/NOPB is usually 5 days.
3.What payment methods are accepted for LM318MX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM318MX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM318MX/NOPB?
LM318MX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM318MX/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 LM318MX/NOPB?
For technical support, including LM318MX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM318MX/NOPB requirements.
6.How does Aetrix verify that LM318MX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM318MX/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 LM318MX/NOPB meets industry standards.
7.What is the process for return or replacement of LM318MX/NOPB?
All LM318MX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM318MX/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 LM318MX/NOPB part is unused and in its original packaging.
Return procedure for LM318MX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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