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Texas Instruments LM318D
- Part No.:
- LM318D
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM318D.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,585
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Product details
Overview
LM318D from Texas Instruments is a precision high-speed operational amplifier in an 8-pin SOIC package, delivering 15 MHz unity-gain bandwidth, ≥50 V/µs slew rate (min), and ±5 V to ±20 V dual supply operation. It features internal frequency compensation, input/output overload protection, and pin compatibility with standard op-amps-used in active filters, sample-and-hold circuits, and A/D converter front-ends.
For engineers reviewing the LM318D datasheet, LM318D pinout, LM318D application, or LM318D equivalent, key selection criteria include its guaranteed minimum slew rate, wide supply range, thermal performance (θJA = 97°C/W), and SOIC-8 packaging for surface-mount industrial signal conditioning designs.
Technical Context
The LM318D implements 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 balanced/compensation pins (BAL/COMP1, COMP2, BAL/COMP3) allow fine-tuning of offset and settling behavior.
Designed for 0°C to 70°C commercial operation, it specifies 10 mV max input offset voltage and 500 nA max input bias current at full temperature range, with common-mode input range of ±11.5 V (at ±15 V supplies) and ±13 V peak output swing into 2 kΩ load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Unity-Gain Bandwidth | 15 MHz typical - enables stable closed-loop operation up to 15 MHz with gain = 1, suitable for wideband filtering and fast signal amplification. |
| Slew Rate | ≥50 V/µs minimum - ensures faithful reproduction of fast-rising edges in pulse amplification and DAC output buffering. |
| Supply Voltage Range | ±5 V to ±20 V - supports flexible rail selection across industrial sensor interfaces and legacy ±12 V or ±15 V systems. |
| Input Offset Voltage | ≤10 mV at 25°C - maintains DC accuracy in precision gain stages where offset-induced error must stay below 0.1% at 10 V output. |
| Common-Mode Input Range | ±11.5 V (at ±15 V supplies) - allows direct connection to signals referenced to mid-supply in single-ended data acquisition paths. |
| Thermal Resistance θJA | 97°C/W (SOIC-8) - defines maximum power dissipation limit (e.g., ~300 mW at 70°C ambient) for board-level thermal design. |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade embedded instrumentation, test equipment, and analog front-end modules. |
Pinout & Package
LM318D is housed in an 8-pin SOIC (D) package per JEDEC MS-012 variation AA, 3.91 mm body width, 1.75 mm max height, with gull-wing leads and RoHS-compliant NiPdAu finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - BAL/COMP1 | Offset null / balance adjustment | Connects to potentiometer wiper for manual input offset trimming; required for sub-mV DC accuracy in precision applications. |
| 2 - IN− | Inverting input | Differential input node; high-impedance bipolar junction with ESD protection diodes to rails. |
| 3 - IN+ | Non-inverting input | Differential input node; matched to IN− for common-mode rejection; shares same ESD protection structure. |
| 4 - VCC− | Negative supply rail | Reference for internal biasing; must be connected to negative supply (e.g., −15 V); not ground-referenced. |
| 5 - COMP2 | Compensation terminal | Accepts external capacitor for overcompensation (enhanced stability) or feed-forward network (increased slew rate). |
| 6 - VCC+ | Positive supply rail | Reference for internal biasing; must be connected to positive supply (e.g., +15 V); decoupling recommended near pin. |
| 7 - OUT | Amplifier output | Class-AB output stage capable of ±13 V swing into 2 kΩ; includes short-circuit protection to either rail or ground. |
| 8 - BAL/COMP3 | Offset null / balance adjustment | Second offset trim terminal; used with Pin 1 and external potentiometer to null differential input offset voltage. |
Key Features
| Feature | Design Value |
|---|---|
| Internal unity-gain compensation | Enables immediate use without external compensation components, reducing BOM count and layout complexity in basic gain stages. |
| Feed-forward compensation support | Allows >150 V/µs slew rate in inverting configurations via external network on COMP2, critical for high-fidelity pulse amplification. |
| Input/output overload protection | Prevents latch-up or damage during transient overvoltage events at inputs or output shorts, improving field reliability in unguarded systems. |
| Same pin assignments as general-purpose op-amps | Direct drop-in replacement for LM741, LM324, or similar 8-pin DIP/SOIC op-amps in existing layouts-no PCB redesign needed. |
| 0.1% settling time < 1 µs | Achieved with single external capacitor on COMP2, enabling fast data acquisition cycles in multiplexed ADC driver applications. |
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-controlled gain element providing precise pole placement and minimal phase distortion. Use Value: 15 MHz bandwidth and 50 V/µs slew rate prevent group delay distortion and slew-induced harmonic generation at filter edge frequencies. |
Use Scenario: Hold capacitor charging/discharging stage in 12-bit successive-approximation ADC front-end. IC Role / Device Role / Timing Role: Unity-gain buffer isolating hold capacitor from ADC input impedance during acquisition phase. Use Value: Sub-1 µs 0.1% settling time ensures full-scale step response meets sampling aperture time requirements for 1 MSPS conversion. |
| A/D Converter Drivers | Oscillator & Waveform Generation |
|
Use Scenario: Driving SAR ADC input with ±10 V full-scale differential signal from transducer amplifier. IC Role / Device Role / Timing Role: Rail-to-rail output-capable buffer with low THD and fast settling to minimize code-dependent nonlinearity. Use Value: ±13 V output swing into 2 kΩ and 10 mV max VIO preserve dynamic range and reduce calibration overhead in precision measurement systems. |
Use Scenario: Wien-bridge oscillator generating 500 kHz sine wave with amplitude stabilization via lamp or JFET. IC Role / Device Role / Timing Role: Low-distortion gain block maintaining loop gain >1 across audio-to-RF frequencies with stable phase margin. Use Value: Internal compensation plus optional external tuning (via COMP2) enables predictable oscillation onset and amplitude control without parasitic peaking. |
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 |
|---|---|---|---|
| OPA637BP | 100 MHz GBW, 350 V/µs slew rate, FET input (5 pA IB), higher cost, requires external compensation. | Better for ultra-high-frequency (>10 MHz) photodiode transimpedance or RF IF amplification where LM318D's 15 MHz bandwidth is limiting. | Select OPA637BP when input bias current <10 pA and bandwidth >50 MHz are mandatory; accept added design complexity and cost. |
| AD8055ARZ | 300 MHz GBW, 1400 V/µs slew rate, voltage-feedback architecture, rail-to-rail output, ±3 V to ±6 V supply only. | Optimized for low-voltage, high-speed portable instrumentation; incompatible with ±15 V legacy systems supported by LM318D. | Choose AD8055ARZ for battery-powered or space-constrained designs needing >100 MHz bandwidth and low supply voltage; verify rail compatibility first. |
Compared with OPA637BP and AD8055ARZ, the LM318D offers proven robustness in ±5 V to ±20 V industrial environments, simpler compensation, and lower cost-making it optimal for legacy-compatible, medium-bandwidth analog signal chains where extreme speed or femtoampere bias is unnecessary.
Availability
LM318D is available at Aetrix Electronics and suitable for active filters, sample-and-hold circuits, A/D converter drivers, and oscillator designs requiring stable component supply across commercial temperature ranges and long-lifecycle industrial programs.
Supply support for LM318D 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 over 90 years of innovation in high-reliability analog ICs.
The LM318D belongs to TI's legacy precision op-amp product line, engineered for high-speed industrial signal conditioning where bandwidth, slew rate, and DC accuracy must coexist without complex external tuning.
FAQ
What is the maximum supply voltage rating for the LM318D?
The LM318D supports a dual supply voltage range of ±5 V to ±20 V. Its absolute maximum ratings specify VCC+ = +20 V and VCC− = −20 V. Operation beyond these limits risks permanent damage. For reliable long-term use, TI recommends staying within ±18 V under typical conditions to maintain thermal margin and ensure 150°C junction temperature is not exceeded.
Does the LM318D require external compensation capacitors to operate?
No-the LM318D includes internal unity-gain frequency compensation, allowing stable operation with no external components in standard configurations. However, external capacitors may be added to Pin 5 (COMP2) for feed-forward compensation (to increase slew rate) or overcompensation (to improve phase margin), depending on circuit requirements. The internal compensation remains active unless explicitly overridden.
Can the LM318D drive a 600 Ω load effectively?
The LM318D is not optimized for 600 Ω loads. Its specified output swing of ±12 V to ±13 V assumes RL ≥ 2 kΩ. Driving 600 Ω increases output current demand, degrading slew rate, increasing distortion, and raising junction temperature. For 600 Ω applications, consider dedicated line drivers like THS3091 or fully buffered alternatives with higher output current capability.
What is the purpose of Pins 1 and 8 (BAL/COMP1 and BAL/COMP3) on the LM318D?
Pins 1 and 8 provide access to the amplifier's internal offset null network. Connecting a 10 kΩ potentiometer between these pins-with its wiper grounded-allows manual adjustment of input offset voltage to ≤1 mV. This is essential in precision DC-coupled applications such as strain gauge amplifiers or integrators where residual offset directly impacts measurement accuracy.
Is the LM318D pin-compatible with the LM741 in SOIC-8 packages?
Yes-the LM318D uses the industry-standard 8-pin SOIC pinout identical to the LM741, LM324, and other legacy op-amps: Pin 2 (IN−), Pin 3 (IN+), Pin 4 (V−), Pin 6 (V+), Pin 7 (OUT), with Pins 1 and 8 assigned to offset null and Pin 5 to compensation. This enables direct replacement in existing layouts without PCB modification, though designers must verify that the higher slew rate and bandwidth do not induce instability in previously compensated circuits.
LM318D Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LM318D FAQ
1.How can I place an order for LM318D through Aetrix?
Please submit a Request for Quotation (RFQ) for LM318D 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 LM318D reliable?
The price and inventory of LM318D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM318D is usually 5 days.
3.What payment methods are accepted for LM318D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM318D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM318D?
LM318D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM318D 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 LM318D?
For technical support, including LM318D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM318D requirements.
6.How does Aetrix verify that LM318D is sourced from the original manufacturer or authorized distributors?
All LM318D 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 LM318D meets industry standards.
7.What is the process for return or replacement of LM318D?
All LM318D units undergo pre-shipment inspection (PSI). If there is an issue with LM318D, 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 LM318D part is unused and in its original packaging.
Return procedure for LM318D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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