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Texas Instruments LM318P
- Part No.:
- LM318P
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LM318P.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:218
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Product details
Overview
LM318P from Texas Instruments is a precision high-speed operational amplifier designed for wide-bandwidth analog signal conditioning in A/D converters, active filters, and sample-and-hold circuits. It delivers 15 MHz unity-gain bandwidth, ≥50 V/µs slew rate (min), ±5 V to ±20 V dual supply operation, internal frequency compensation, and input/output overload protection - all in an 8-pin PDIP package rated for 0°C to 70°C.
For engineers reviewing the LM318P datasheet, LM318P pinout, LM318P application, or LM318P equivalent, key selection criteria include its fast settling time (<1 µs to 0.1% error), balanced trade-off between speed and DC accuracy (10 mV max input offset voltage), and compatibility with standard op-amp PCB footprints.
Technical Context
The LM318P uses a bipolar input stage with internal unity-gain compensation, enabling stable operation without external components while supporting optional feed-forward compensation to boost slew rate beyond 150 V/µs in inverting configurations. Its input stage includes base-emitter diode clamping for ±1 V differential input protection.
It features rail-to-rail output swing capability (±12 V into 2 kΩ at ±15 V supplies), common-mode input range of ±11.5 V, and operates across ±5 V to ±20 V supply rails. Thermal design is supported by θJA = 85°C/W for the PDIP package and absolute maximum junction temperature of 150°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Unity-Gain Bandwidth | 15 MHz typical - enables stable closed-loop operation up to ~10 MHz in non-inverting gain ≥2 configurations |
| Slew Rate | ≥50 V/µs minimum - supports clean 10 VPP output at ≥5 MHz without slewing distortion |
| Input Offset Voltage | ≤10 mV at 25°C - limits DC error to <0.1% in 10 V full-scale precision gain stages |
| Supply Voltage Range | ±5 V to ±20 V - accommodates industrial ±12 V, ±15 V, and test equipment ±5 V systems |
| Input Bias Current | ≤500 nA over full temperature range - minimizes voltage drop across high-Z sensor interfaces |
| Common-Mode Input Range | ±11.5 V at ±15 V supplies - allows direct connection to signals referenced near supply rails |
| Output Voltage Swing | ±12 V into 2 kΩ load - delivers >80% of rail-to-rail span for dynamic headroom in analog front-ends |
Pinout & Package
LM318P is housed in an 8-pin plastic dual in-line package (PDIP) with 0.3-inch body width and through-hole mounting. Pin spacing follows JEDEC MS-001 standard, compatible with legacy op-amp layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | BAL/COMP1 | Offset null / external compensation node - used with potentiometer for VIO trimming or capacitor for stability tuning |
| 2 | IN– | Inverting input - high-impedance node accepting feedback network or signal source |
| 3 | IN+ | Non-inverting input - high-impedance node for reference or signal injection |
| 4 | VCC– | Negative supply rail - must be decoupled locally to minimize noise coupling into input stage |
| 5 | COMP2 | External compensation terminal - connects to capacitor for feed-forward or overcompensation networks |
| 6 | OUT | Amplified output - capable of driving ≥2 kΩ loads with minimal distortion at high frequencies |
| 7 | VCC+ | Positive supply rail - requires local 0.1 µF ceramic + 10 µF electrolytic decoupling |
| 8 | BAL/COMP3 | Offset null / external compensation node - paired with Pin 1 for symmetric nulling or multi-pole compensation |
Key Features
| Feature | Design Value |
|---|---|
| Internal unity-gain compensation | Enables immediate use without external capacitors - reduces BOM count and layout complexity for basic gain stages |
| Feed-forward compensation support | Allows slew rate enhancement to >150 V/µs in inverting topologies - critical for fast-settling multiplexer-driven ADC drivers |
| Input/output overload protection | Prevents latch-up or damage during transient overvoltage events - improves robustness in industrial sensor interfaces |
| Same pin assignments as general-purpose op-amps | Direct replacement for LM741/LM301 footprints - enables drop-in upgrade in existing designs without PCB revision |
| 0.1% settling time <1 µs | Meets timing budget for 1 MSPS successive-approximation ADCs - eliminates need for external buffer amplifiers |
Applications
| High-Speed Data Acquisition | Active Filter Design |
|---|---|
|
Use Scenario: Driving the input of a 12-bit SAR ADC sampling at 1 MSPS with multiplexed transducer inputs. IC Role / Device Role / Timing Role: Buffer and level-shift analog signals while settling to 0.1% within 1 µs prior to conversion. Use Value: Eliminates external settling-time optimization circuitry; maintains linearity across full 10 V input range. |
Use Scenario: Implementing a 4th-order Butterworth low-pass filter at 100 kHz cutoff for anti-aliasing. IC Role / Device Role / Timing Role: High-fidelity gain stage in multiple-feedback (MFB) topology with minimal phase shift. Use Value: Preserves filter Q-factor and passband flatness due to 15 MHz bandwidth and low distortion. |
| Sample-and-Hold Circuits | Oscillator & Waveform Generation |
|
Use Scenario: Holding voltage from a photodiode amplifier during CCD pixel readout cycles. IC Role / Device Role / Timing Role: Fast acquisition amplifier with low droop rate during hold phase. Use Value: Achieves <0.05% droop over 10 µs hold time using internal compensation and low bias current. |
Use Scenario: Building a Wien-bridge oscillator operating at 50 kHz with amplitude stabilization. IC Role / Device Role / Timing Role: Low-distortion gain element maintaining loop gain stability across temperature. Use Value: Enables THD <0.5% at 5 VPP output due to high slew rate and wide bandwidth. |
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 |
|---|---|---|---|
| OPA211IDR | FET-input architecture; 45 MHz GBW; 27 V/µs slew rate; lower input bias current (1 pA) | Better for ultra-high-Z sources (e.g., piezoelectric sensors); less suitable for high-output-current drive | Select when input impedance >1012 Ω is required and supply is ≤±18 V |
| AD8065ARZ | Voltage-feedback architecture; 145 MHz GBW; 180 V/µs slew rate; rail-to-rail output | Superior small-signal performance but higher quiescent current (7 mA vs. 8 mA); no internal offset null pins | Select when bandwidth >50 MHz is needed and external trimming is acceptable |
Compared with OPA211IDR and AD8065ARZ, the LM318P offers unique value in legacy-compatible PDIP packaging, built-in offset null terminals, and proven reliability in industrial temperature-cycled environments - making it preferred for cost-sensitive, long-lifecycle instrumentation upgrades.
Availability
LM318P is available at Aetrix Electronics and suitable for high-speed data acquisition, active filtering, sample-and-hold circuits, oscillator design, and general-purpose precision amplification requiring stable component supply across extended production lifecycles.
Supply support for LM318P 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 connectivity technologies with over 90 years of innovation in precision analog ICs.
The LM318P belongs to TI's legacy precision op-amp product line, engineered specifically for applications demanding both high speed and DC accuracy - including test equipment, medical instrumentation, and industrial control signal chains.
FAQ
What is the maximum operating temperature range for the LM318P?
The LM318P is specified for operation from 0°C to +70°C ambient temperature. This commercial-grade rating aligns with its PDIP packaging and target applications in benchtop instruments and non-military industrial systems. Exceeding this range may degrade offset voltage drift and slew rate performance, and is not guaranteed by TI's characterization data.
Does the LM318P require external compensation capacitors for unity-gain stability?
No - the LM318P includes internal frequency compensation optimized for unity-gain stability. External capacitors are optional and used only to modify performance: feed-forward compensation on Pin 5 can raise slew rate above 150 V/µs, while overcompensation extends phase margin for improved step response in sensitive feedback loops.
Can the LM318P replace an LM741 in an existing circuit?
Yes - the LM318P shares identical pinout (DIP-8), power supply polarity, and input/output polarity conventions with the LM741. However, due to its 30× higher slew rate and 10× wider bandwidth, users must verify that feedback networks and layout parasitics do not induce instability, especially in high-gain configurations.
What is the purpose of Pins 1 and 8 (BAL/COMP1 and BAL/COMP3) on the LM318P?
Pins 1 and 8 provide access to the amplifier's internal offset null and compensation nodes. Connecting a 10 kΩ potentiometer between them (wiper to VCC–) allows manual trimming of input offset voltage. Alternatively, connecting capacitors between these pins and ground or supply rails enables custom frequency compensation for specialized settling or stability requirements.
Is the LM318P RoHS compliant and lead-free?
Yes - the LM318P is manufactured with Green (RoHS & no Sb/Br) material content and NIPDAU lead finish, meeting current EU RoHS Directive requirements. It is rated for lead-free reflow processes with peak temperature up to 260°C, and carries no halogen restrictions beyond the 1000 ppm JS709B threshold.
LM318P Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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:
- 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
LM318P FAQ
1.How can I place an order for LM318P through Aetrix?
Please submit a Request for Quotation (RFQ) for LM318P 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 LM318P reliable?
The price and inventory of LM318P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM318P is usually 5 days.
3.What payment methods are accepted for LM318P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM318P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM318P?
LM318P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM318P 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 LM318P?
For technical support, including LM318P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM318P requirements.
6.How does Aetrix verify that LM318P is sourced from the original manufacturer or authorized distributors?
All LM318P 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 LM318P meets industry standards.
7.What is the process for return or replacement of LM318P?
All LM318P units undergo pre-shipment inspection (PSI). If there is an issue with LM318P, 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 LM318P part is unused and in its original packaging.
Return procedure for LM318P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM318P Tags
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