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Texas Instruments LM318PS
- Part No.:
- LM318PS
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
LM318PS.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,480
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Product details
Overview
LM318PS from Texas Instruments is a single high-speed operational amplifier designed for precision analog signal conditioning in bandwidth-critical circuits. It delivers 15 MHz unity-gain bandwidth, ≥50 V/µs slew rate, and operates from ±5 V to ±20 V supply rails, with input offset voltage ≤10 mV at 25°C. It is widely used in active filters and sample-and-hold stages where fast settling and low distortion are required.
For engineers reviewing the LM318PS datasheet, LM318PS pinout, LM318PS application, or LM318PS equivalent, key selection considerations include its 0°C to 70°C industrial temperature range, internal frequency compensation enabling stable unity-gain operation, and compatibility with standard 8-pin DIP footprints despite its PS package variant.
Technical Context
The LM318PS employs a bipolar input stage with internal unity-gain compensation, enabling stable operation without external components while supporting optional feed-forward or overcompensation for enhanced slew rate (>150 V/µs) or improved phase margin. Its input stage includes base-emitter diode clamping for ±15 V common-mode protection.
It features overload protection on both input and output terminals, supports rail-to-rail output swing of ±12 V into 2 kΩ (±15 V supplies), and maintains DC precision-input bias current ≤500 nA and CMRR ≥70 dB across its full operating temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Unity-Gain Bandwidth | 15 MHz typical - enables stable closed-loop gain ≥1 with minimal phase lag up to 15 MHz. |
| Slew Rate | ≥50 V/µs minimum - ensures faithful reproduction of fast-rising signals (e.g., 10 V step in ≤200 ns). |
| Supply Voltage Range | ±5 V to ±20 V - supports dual-rail operation in industrial and test equipment with wide dynamic headroom. |
| Input Offset Voltage | ≤10 mV at 25°C - limits DC error in precision gain stages and sensor front-ends without trimming. |
| Operating Temperature | 0°C to 70°C - qualified for commercial and industrial ambient environments, not extended or military grade. |
| Input Bias Current | ≤500 nA over full range - reduces voltage error across high-impedance feedback networks (e.g., >100 kΩ). |
| Common-Mode Range | ±11.5 V (±15 V supplies) - allows direct interfacing with signals referenced near supply rails. |
Pinout & Package
The LM318PS uses an 8-pin plastic DIP (Dual In-line Package) with through-hole mounting. Pin assignments match industry-standard op-amp layouts for drop-in replacement in legacy designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | BAL/COMP1 | Offset null / compensation terminal - connects to external potentiometer for VIO adjustment or capacitor for feed-forward compensation. |
| 2 | IN– | Inverting input - high-impedance node accepting feedback or signal inversion; protected by internal back-to-back diodes. |
| 3 | IN+ | Non-inverting input - high-impedance node for reference or signal injection; same protection as IN–. |
| 4 | VCC– | Negative supply rail - must be connected to system ground or negative voltage; supports up to –20 V. |
| 5 | COMP2 | Compensation terminal - used with external capacitor for stability tuning or bandwidth extension in inverting configurations. |
| 6 | OUT | Amplified output - capable of ±12 V swing into 2 kΩ; internally limited to prevent latch-up during overload. |
| 7 | VCC+ | Positive supply rail - accepts up to +20 V; decoupling recommended within 1 cm of pin. |
| 8 | BAL/COMP3 | Offset null / compensation terminal - second leg of nulling network or alternate compensation point. |
Key Features
| Feature | Design Value |
|---|---|
| Internal unity-gain compensation | Enables immediate use in unity-gain buffer or follower configurations without external components. |
| Feed-forward compensation support | Allows slew rate boost to >150 V/µs in inverting amplifiers via COMP1/COMP2 connections. |
| Input/output overload protection | Prevents damage during transient overvoltage or short-circuit events without external limiting circuitry. |
| Standard 8-pin DIP pinout | Direct replacement for LM741, LM301, and other general-purpose op-amps in existing PCB layouts. |
| 0.1% settling time <1 µs | Achievable with single external capacitor on COMP2 - critical for high-speed data acquisition systems. |
Applications
| Active Filters | Sample-and-Hold Circuits |
|---|---|
|
Use Scenario: Second-order Sallen-Key low-pass filter operating at 1 MHz cutoff with <1% passband ripple. IC Role / Device Role / Timing Role: High-speed voltage amplifier providing precise gain and phase response with minimal group delay distortion. Use Value: 15 MHz bandwidth and 50 V/µs slew rate ensure linear-phase behavior and accurate signal reconstruction up to 1 MHz. |
Use Scenario: Hold capacitor charging and isolation in 12-bit ADC front-end with 1 µs acquisition window. IC Role / Device Role / Timing Role: Unity-gain buffer isolating ADC input from source impedance while driving 100 pF hold capacitor. Use Value: Fast settling (<1 µs to 0.1%) and low output impedance minimize aperture error and sampling distortion. |
| Oscillators | A/D Converter Drivers |
|
Use Scenario: Wien-bridge oscillator generating 500 kHz sine wave with amplitude stabilization. IC Role / Device Role / Timing Role: Gain block in positive-feedback loop requiring stable open-loop gain and low phase noise. Use Value: High GBW and low input bias current maintain oscillation stability and reduce harmonic distortion. |
Use Scenario: Driving multiplexed sensor outputs into successive-approximation ADC with 1 MSPS sampling rate. IC Role / Device Role / Timing Role: Signal conditioner buffering and level-shifting analog inputs prior to conversion. Use Value: Wide supply range (±5 V to ±20 V) accommodates varying sensor output levels without additional level translation. |
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 |
|---|---|---|---|
| LM318D | Same electrical specs; SOIC-8 package instead of PS (plastic DIP); lower thermal resistance but surface-mount only. | Requires PCB redesign for SMT assembly; unsuitable for through-hole prototyping or legacy DIP sockets. | Select LM318D for automated production with space-constrained layouts; LM318PS remains optimal for breadboarding and field-replaceable modules. |
| TL081CP | JFET-input architecture; higher input impedance (≥10¹² Ω), lower bias current (≤30 pA), but only 3 MHz GBW and 13 V/µs slew rate. | Better for ultra-high-Z sensor interfaces (e.g., piezoelectric), but insufficient for >100 kHz active filtering or fast settling. | Choose TL081CP when input impedance dominates design requirements; LM318PS is preferred when speed and settling performance are primary. |
Compared with LM318D and TL081CP, the LM318PS uniquely balances through-hole manufacturability, 15 MHz bandwidth, and robust overload protection-making it the default choice for industrial test equipment and analog subsystems requiring proven reliability and serviceability.
Availability
LM318PS is available at Aetrix Electronics and suitable for active filters, sample-and-hold circuits, oscillator design, and A/D converter driver stages requiring stable component supply across commercial and light-industrial programs.
Supply support for LM318PS 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 decades of heritage in precision linear ICs.
The LM318PS belongs to TI's legacy high-speed op-amp family, engineered specifically for analog signal path applications demanding bandwidth, slew rate, and DC accuracy-especially in instrumentation, data acquisition, and communications infrastructure.
FAQ
What is the maximum supply voltage rating for the LM318PS?
The LM318PS supports a total supply voltage range of ±5 V to ±20 V, meaning the absolute maximum difference between VCC+ and VCC– is 40 V. Operation beyond ±20 V risks permanent damage per the Absolute Maximum Ratings table in the SLOS063A datasheet. Derating is required above 25°C ambient to maintain safe power dissipation.
Does the LM318PS require external compensation capacitors for unity-gain stability?
No-the LM318PS includes internal unity-gain frequency compensation and operates stably at gain = 1 without external components. However, external capacitors may be added at COMP1/COMP2 pins to increase slew rate in inverting configurations or improve phase margin for higher closed-loop gains.
What is the input offset voltage specification for the LM318PS over temperature?
The LM318PS has a maximum input offset voltage of 15 mV across its full operating range (0°C to 70°C), and ≤10 mV at 25°C. This parameter is specified in the Electrical Characteristics table of the SLOS063A datasheet and reflects worst-case drift under industrial ambient conditions.
Can the LM318PS drive a 600 Ω load effectively?
The LM318PS is characterized for RL ≥ 2 kΩ in datasheet tests. Driving 600 Ω increases output current demand and may reduce peak output swing, increase distortion, and raise junction temperature. For 600 Ω loads, verify thermal derating and consider using a dedicated line driver or buffer stage ahead of the LM318PS.
Is the LM318PS pin-compatible with the LM741?
Yes-the LM318PS uses the same 8-pin DIP pinout as the LM741: Pin 2 (IN–), Pin 3 (IN+), Pin 4 (VCC–), Pin 6 (OUT), and Pin 7 (VCC+) align identically. This allows direct substitution in many legacy designs, though users must verify bandwidth, slew rate, and supply voltage compatibility in the target application.
LM318PS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.209", 5.30mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 70V/µs
- Gain Bandwidth Product:
- 15 MHz
- -3db Bandwidth:
- -
- 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-SO
LM318PS FAQ
1.How can I place an order for LM318PS through Aetrix?
Please submit a Request for Quotation (RFQ) for LM318PS 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 LM318PS reliable?
The price and inventory of LM318PS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM318PS is usually 5 days.
3.What payment methods are accepted for LM318PS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM318PS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM318PS?
LM318PS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM318PS 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 LM318PS?
For technical support, including LM318PS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM318PS requirements.
6.How does Aetrix verify that LM318PS is sourced from the original manufacturer or authorized distributors?
All LM318PS 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 LM318PS meets industry standards.
7.What is the process for return or replacement of LM318PS?
All LM318PS units undergo pre-shipment inspection (PSI). If there is an issue with LM318PS, 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 LM318PS part is unused and in its original packaging.
Return procedure for LM318PS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM318PS Tags
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