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Texas Instruments LM318DR
- Part No.:
- LM318DR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM318DR.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:11,923
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Product details
Overview
LM318DR from Texas Instruments is a precision high-speed operational amplifier designed for wide-bandwidth signal conditioning in analog front-ends. It delivers 15 MHz unity-gain bandwidth, 50 V/µs minimum slew rate, ±5 V to ±20 V dual supply operation, and internal frequency compensation - enabling stable closed-loop operation without external components. It is used in active filters, A/D converter input drivers, and sample-and-hold circuits requiring fast settling and low distortion.
For engineers reviewing the LM318DR datasheet, LM318DR pinout, LM318DR application, or LM318DR equivalent, key selection criteria include its 15 MHz small-signal bandwidth, 50 V/µs slew rate at unity gain, ±10 mV input offset voltage maximum, SOIC-8 packaging, and compatibility with ±15 V supply rails in precision timing and data acquisition systems.
Technical Context
The LM318DR implements a bipolar input stage with internal unity-gain compensation, supporting stable operation across its full specified temperature range (0°C to 70°C). Its architecture enables feed-forward compensation for inverting configurations, boosting slew rate beyond 150 V/µs and nearly doubling bandwidth when externally modified.
It features input overload protection via back-to-back base-emitter diodes, output short-circuit tolerance up to ±20 V supplies, and balanced compensation terminals (BAL/COMP1, COMP2, BAL/COMP3) allowing fine-tuning of offset and stability - distinguishing it from general-purpose op-amps while retaining standard 8-pin DIP/SOIC pin assignments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Unity-Gain Bandwidth | 15 MHz typical - supports stable amplification up to 15 MHz with gain = 1, suitable for video and fast pulse applications. |
| Slew Rate | 50 V/µs minimum - ensures ≤1 µs settling to 0.1% for 10 V step inputs, critical for sample-and-hold and ADC driver stages. |
| Input Offset Voltage | 10 mV maximum at 25°C - defines worst-case DC error in precision gain stages without trimming. |
| Supply Voltage Range | ±5 V to ±20 V - allows operation from low-voltage portable rails to industrial ±15 V systems. |
| Input Bias Current | 500 nA maximum over full temperature range - limits input impedance loading effects in high-Z sensor interfaces. |
| Common-Mode Input Range | ±11.5 V at ±15 V supplies - supports rail-to-rail input signal handling within 3.5 V of either supply. |
| Output Voltage Swing | ±12 V minimum into 2 kΩ - delivers >80% of supply rails, reducing headroom loss in single-supply derived designs. |
Pinout & Package
LM318DR is housed in an 8-pin SOIC (D package), 3.9 mm width, 1.75 mm max height, RoHS-compliant with NiPdAu lead finish and JEDEC MS-012 AA outline. Pin 1 identifier is marked by a beveled corner or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (BAL/COMP1) | Offset null / compensation | Connects to external potentiometer wiper for input offset adjustment; also used for feed-forward compensation in inverting amps. |
| 2 (IN–) | Inverting input | Differential input node; internally protected by anti-parallel diodes limiting differential voltage to ~1 V without series resistance. |
| 3 (IN+) | Non-inverting input | Differential input node; same protection and bias current characteristics as IN–. |
| 4 (VCC–) | Negative supply | Accepts –5 V to –20 V; must be decoupled locally to minimize noise coupling into high-gain stages. |
| 5 (COMP2) | Compensation terminal | Used with external capacitor for overcompensation (enhanced phase margin) or feed-forward paths to increase slew rate. |
| 6 (VCC+) | Positive supply | Accepts +5 V to +20 V; symmetric dual supply required for full common-mode and output swing specification. |
| 7 (OUT) | Amplifier output | Capable of sourcing/sinking ≥10 mA; short-circuit tolerant to either rail indefinitely at TA ≤ 70°C. |
| 8 (BAL/COMP3) | Offset null / compensation | Second offset null terminal; paired with Pin 1 for 2-terminal nulling; also used with Pin 5 for advanced compensation networks. |
Key Features
| Feature | Design Value |
|---|---|
| Internal unity-gain compensation | Eliminates need for external compensation components in most configurations, reducing BOM count and layout complexity. |
| Feed-forward compensation support | Enables >150 V/µs slew rate and doubled bandwidth in inverting topologies via Pin 1/Pin 5/Pin 8 network. |
| Input and output overload protection | Back-to-back BE diodes on inputs and short-circuit-tolerant output allow robust operation in transient-prone environments. |
| Standard 8-pin SOIC pinout | Direct drop-in replacement for legacy general-purpose op-amps (e.g., LM741, LM301) in existing PCB layouts. |
| Wide supply range (±5 V to ±20 V) | Supports both low-power portable systems and industrial ±15 V infrastructure without redesign. |
Applications
| Active Filters | A/D Converter Drivers |
|---|---|
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 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 pulse reproduction up to 1 MHz without peaking or attenuation. | Use Scenario: Driving the input of a 12-bit successive-approximation ADC sampling at 1 MSPS with 0.5 LSB linearity requirement. IC Role / Device Role / Timing Role: Buffer and gain-stage amplifier isolating sensor signal from ADC input capacitance and settling within 1 µs to 0.1%. Use Value: Settling time <1 µs to 0.1% error band and ±10 mV offset enable full-scale accuracy without calibration in medium-speed data acquisition. |
| Sample-and-Hold Circuits | Oscillator & Function Generators |
Use Scenario: Hold amplifier in a monolithic sample-and-hold IC requiring sub-100 ns aperture time and <0.05% droop over 10 µs hold period. IC Role / Device Role / Timing Role: Output buffer maintaining charge integrity during hold phase while delivering fast acquisition during sample phase. Use Value: Low input bias current (<500 nA) minimizes hold capacitor discharge; high slew rate ensures rapid acquisition edge fidelity. | Use Scenario: Triangle-wave generator core in a programmable function generator producing 100 kHz waveforms with <1% THD. IC Role / Device Role / Timing Role: Integrator and comparator amplifier in a relaxation oscillator topology requiring matched slew and linearity. Use Value: Symmetrical 50 V/µs slew rate and low input offset (<10 mV) ensure balanced rise/fall times and minimal zero-crossing jitter. |
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 | Lower 1.1 nV/√Hz voltage noise, 45 MHz GBW, but only ±18 V max supply; no internal compensation pins. | Preferred for low-noise precision instrumentation; not suitable for feed-forward compensation or legacy board reuse. | Select OPA211IDR when noise performance dominates and external compensation is unnecessary. |
| AD8065ARZ | 320 MHz GBW, 180 V/µs slew rate, but higher 1.5 mA supply current and ±5 V to ±6 V supply limit. | Better for RF and video; incompatible with ±15 V systems and lacks offset-null pins for DC trimming. | Choose AD8065ARZ for ultra-high-speed signal chains where supply headroom and DC adjustability are secondary. |
Compared with OPA211IDR and AD8065ARZ, the LM318DR uniquely balances legacy compatibility (standard pinout, offset-null terminals), ±20 V supply tolerance, and 15 MHz bandwidth with proven reliability in industrial analog signal paths - making it optimal for cost-sensitive, long-lifecycle designs requiring field-serviceable trimming and wide supply flexibility.
Availability
LM318DR is available at Aetrix Electronics and suitable for active filters, A/D converter drivers, sample-and-hold circuits, and oscillator designs requiring stable component supply and long-term manufacturability.
Supply support for LM318DR 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 company headquartered in Dallas, Texas, specializing in analog, embedded processing, and power management technologies since 1930.
The LM318DR belongs to TI's legacy precision op-amp product line, engineered for high-speed analog signal conditioning in test equipment, industrial control, and data acquisition systems where bandwidth, DC accuracy, and design longevity are prioritized.
FAQ
What is the maximum supply voltage rating for LM318DR?
The LM318DR supports a dual supply voltage range of ±5 V to ±20 V. Absolute maximum ratings specify VCC+ ≤ +20 V and VCC– ≥ –20 V. Operation beyond these limits risks permanent damage. The device is characterized and guaranteed over ±15 V for all key parameters including bandwidth and slew rate, and remains functional at ±20 V with minor derating of output swing and thermal dissipation.
Does LM318DR require external compensation components?
No - the LM318DR features internal unity-gain frequency compensation, enabling stable operation without external capacitors in standard configurations. However, Pins 1, 5, and 8 provide access to internal compensation nodes, allowing optional external networks for feed-forward enhancement (increasing slew rate), overcompensation (improving phase margin), or settling-time optimization. This dual capability distinguishes it from fully fixed-compensation op-amps.
What is the input offset voltage specification for LM318DR?
The LM318DR has a maximum input offset voltage of 10 mV at 25°C, with a full-temperature-range maximum of 15 mV. This parameter is measured under open-loop conditions with VO = 0. Unlike laser-trimmed op-amps, the LM318DR relies on external nulling via Pins 1 and 8, enabling field calibration to reduce effective offset below 1 mV in critical DC-coupled applications.
Can LM318DR drive heavy capacitive loads?
The LM318DR is not optimized for direct driving of large capacitive loads (>100 pF) without isolation. Its internal compensation assumes resistive or lightly capacitive feedback. For loads exceeding 100 pF, a series resistor (≥33 Ω) between output and capacitance is recommended to maintain stability. The datasheet confirms stable operation with CL = 100 pF in slew rate test conditions, but larger values risk ringing or oscillation without added phase compensation.
Is LM318DR pin-compatible with other op-amps?
Yes - the LM318DR uses the industry-standard 8-pin SOIC (D package) footprint with identical pin assignments to general-purpose op-amps like the LM741 and LM301. Pin 1 (BAL/COMP1), Pin 2 (IN–), Pin 3 (IN+), Pin 4 (VCC–), Pin 5 (COMP2), Pin 6 (VCC+), Pin 7 (OUT), and Pin 8 (BAL/COMP3) match the conventional dual-op-amp pinout orientation, enabling drop-in replacement in existing layouts without PCB revision.
LM318DR 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
LM318DR FAQ
1.How can I place an order for LM318DR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM318DR 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 LM318DR reliable?
The price and inventory of LM318DR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM318DR is usually 5 days.
3.What payment methods are accepted for LM318DR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM318DR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM318DR?
LM318DR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM318DR 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 LM318DR?
For technical support, including LM318DR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM318DR requirements.
6.How does Aetrix verify that LM318DR is sourced from the original manufacturer or authorized distributors?
All LM318DR 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 LM318DR meets industry standards.
7.What is the process for return or replacement of LM318DR?
All LM318DR units undergo pre-shipment inspection (PSI). If there is an issue with LM318DR, 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 LM318DR part is unused and in its original packaging.
Return procedure for LM318DR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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