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Texas Instruments LM318PG4
- Part No.:
- LM318PG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LM318PG4.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,040
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Product details
Overview
LM318PG4 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 small-signal bandwidth, ≥50 V/µs slew rate, ±5 V to ±20 V dual supply operation, internal unity-gain compensation, and input/output overload protection.
For engineers reviewing the LM318PG4 datasheet, LM318PG4 pinout, LM318PG4 application, or LM318PG4 equivalent, key selection criteria include its guaranteed 50 V/µs minimum slew rate at unity gain, 10 mV maximum input offset voltage at 25°C, and compatibility with standard 8-pin DIP layouts used in legacy test and instrumentation designs.
Technical Context
The LM318PG4 uses a bipolar input stage with internal frequency compensation optimized for unity-gain stability while supporting external feed-forward compensation to boost slew rate beyond 150 V/µs in inverting configurations. Its input stage includes base-emitter diode clamps for ±1 V differential input protection.
It operates across 0°C to 70°C ambient temperature with ±11.5 V common-mode input range (at ±15 V supplies) and ±13 V peak output swing into 2 kΩ load. The device features internal overload protection on both inputs and output, enabling robust operation in transient-prone signal paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Small-Signal Bandwidth | 15 MHz typical - enables stable closed-loop operation up to ~10 MHz in unity-gain buffer or inverting amplifier configurations |
| Slew Rate | ≥50 V/µs minimum - supports clean reproduction of fast-rising signals such as 10 V step responses with <1 µs 0.1% settling time when externally compensated |
| Input Offset Voltage | ≤10 mV at 25°C - limits DC error in precision gain stages and integrators without requiring nulling circuitry |
| Supply Voltage Range | ±5 V to ±20 V - accommodates industrial ±12 V, ±15 V, and test equipment ±5 V rails without level-shifting |
| Input Bias Current | ≤500 nA over full temperature range - minimizes voltage drop across high-impedance sensor interfaces and feedback networks |
| Common-Mode Input Range | ±11.5 V at ±15 V supplies - allows direct connection to rail-referenced transducers without attenuation or biasing |
| Output Voltage Swing | ±13 V into 2 kΩ - delivers full dynamic range to downstream ADC drivers or comparator inputs |
Pinout & Package
LM318PG4 is supplied in an 8-pin plastic dual in-line package (PDIP), compliant with JEDEC MS-001, with 0.3-inch body width and 0.1-inch lead pitch. Thermal resistance θJA is 85°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | BAL/COMP1 | Offset null adjustment terminal - connects to potentiometer wiper for manual input offset trimming |
| 2 | IN– | Inverting input - accepts feedback network and signal inversion point in standard op-amp configurations |
| 3 | IN+ | Non-inverting input - provides high-impedance signal reference point for follower or summing applications |
| 4 | VCC– | Negative supply rail - must be decoupled locally to minimize noise coupling into input stage |
| 5 | COMP2 | External compensation terminal - accepts capacitor for feed-forward compensation to increase slew rate |
| 6 | VCC+ | Positive supply rail - requires local 0.1 µF ceramic decoupling for high-frequency stability |
| 7 | OUT | Amplified output - drives capacitive loads up to 100 pF directly; larger loads require isolation resistor |
| 8 | BAL/COMP3 | Second offset null terminal - completes nulling network with Pin 1 for symmetric DC balance |
Key Features
| Feature | Design Value |
|---|---|
| Internal unity-gain compensation | Enables immediate use without external compensation components, reducing BOM count and layout complexity |
| Feed-forward compensation support | Allows external capacitor on COMP2 to raise slew rate >150 V/µs and extend bandwidth in critical inverting paths |
| Input/output overload protection | Prevents latch-up or damage during power sequencing, signal overdrive, or short-circuit events without external limiting |
| Standard 8-pin DIP pinout | Direct replacement for legacy general-purpose op-amps (e.g., LM741, LM301) in existing PCB footprints |
| Wide supply range (±5 V to ±20 V) | Supports single-supply-derived split rails and legacy ±12 V/±15 V systems without regulator redesign |
Applications
| High-Speed Data Acquisition | Active Filter Design |
|---|---|
Use Scenario: Front-end signal conditioning for 12-bit, 1 MSPS successive-approximation ADCs where fast settling and low distortion are required. IC Role / Device Role / Timing Role: Buffer and gain-stage amplifier driving ADC input with minimal group delay and overshoot. Use Value: 50 V/µs slew rate ensures ≤1 µs 0.1% settling for 10 V full-scale steps, meeting timing budget for 1 µs conversion cycles. | Use Scenario: 4th-order Butterworth low-pass filter with 1 MHz cutoff in spectrum analyzer front ends. IC Role / Device Role / Timing Role: High-Q active filter section requiring wide open-loop bandwidth to maintain phase linearity near cutoff. Use Value: 15 MHz small-signal bandwidth preserves filter transfer function accuracy up to 10× cutoff frequency, minimizing passband ripple. |
| Sample-and-Hold Circuits | Test Equipment Amplifiers |
Use Scenario: Hold amplifier in precision digital multimeter (DMM) architectures capturing 100 kHz AC waveforms. IC Role / Device Role / Timing Role: Output buffer isolating hold capacitor from load while maintaining charge integrity during acquisition. Use Value: Low 500 nA max input bias current prevents significant droop across 1 nF hold capacitors over 100 ms sampling intervals. | Use Scenario: Output driver in programmable gain instrumentation amplifiers used in automated test systems. IC Role / Device Role / Timing Role: Final gain stage delivering calibrated voltage outputs to DUT interface connectors. Use Value: ±13 V output swing into 2 kΩ meets IEEE 488.2 signal level requirements for TTL-compatible analog outputs. |
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 |
|---|---|---|---|
| LM318DR | Same electrical specs; SOIC-8 package with RoHS-compliant NiPdAu finish and moisture sensitivity level 1 | Preferred for new surface-mount designs requiring automated assembly and smaller footprint | Select LM318DR for volume production where board space and reflow compatibility are prioritized over through-hole serviceability |
| OPA637BP | Higher 80 MHz bandwidth and 350 V/µs slew rate; FET input (10 pA bias current); requires external compensation | Used in ultra-high-fidelity audio and RF IF amplification where LM318PG4 bandwidth is insufficient | Choose OPA637BP only when >50 MHz closed-loop bandwidth or sub-pA bias current is mandatory; adds design complexity |
Compared with LM318DR, LM318PG4 offers identical performance in a through-hole PDIP package ideal for prototyping and field-replaceable modules; compared with OPA637BP, it trades bandwidth and bias current for plug-and-play stability and lower system cost in industrial signal chain applications.
Availability
LM318PG4 is available at Aetrix Electronics and suitable for high-speed data acquisition, active filter design, sample-and-hold circuits, test equipment amplifiers, and legacy system repair requiring stable component supply and long-term obsolescence management.
Supply support for LM318PG4 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 ICs, embedded processors, and educational technology solutions.
The LM318 series belongs to TI's legacy precision op-amp product line, engineered specifically for high-speed analog signal processing in instrumentation, test gear, and industrial control systems where reliability and proven performance outweigh cutting-edge specs.
FAQ
What is the maximum operating temperature range for the LM318PG4?
The LM318PG4 is rated for operation from 0°C to 70°C ambient temperature. This commercial-grade specification aligns with its intended use in benchtop instruments, data loggers, and non-military industrial systems. Exceeding 70°C ambient may degrade slew rate and increase input offset drift beyond datasheet limits. For extended temperature operation, the LM218 (–25°C to 85°C) or LM118 (–55°C to 125°C) variants are specified, but LM318PG4 itself is not qualified beyond 70°C.
Does the LM318PG4 require external compensation capacitors to operate stably?
No, the LM318PG4 includes internal unity-gain frequency compensation and operates stably in standard inverting and non-inverting configurations without external components. However, Pin 5 (COMP2) supports optional feed-forward compensation: adding a capacitor between COMP2 and VCC– can increase slew rate beyond 150 V/µs and improve bandwidth in demanding inverting applications. This flexibility allows designers to retain simplicity where needed or optimize performance where justified.
Can the LM318PG4 drive capacitive loads directly?
The LM318PG4 can drive capacitive loads up to 100 pF directly without instability, as verified in the datasheet test circuit for slew rate measurement. For loads exceeding 100 pF - such as ADC input capacitance plus PCB trace capacitance - a small isolation resistor (e.g., 20–50 Ω) placed between the LM318PG4 output and the load restores phase margin and prevents ringing. This behavior is consistent across all LM318 variants and reflects the amplifier's internal compensation topology.
What is the purpose of Pins 1 and 8 (BAL/COMP1 and BAL/COMP3) on the LM318PG4?
Pins 1 and 8 on the LM318PG4 serve dual functions: BAL/COMP1 (Pin 1) and BAL/COMP3 (Pin 8) form the terminals for an external 10 kΩ potentiometer used to null input offset voltage. Connecting the potentiometer wiper to Pin 1 and its ends to Pins 1 and 8 applies opposing DC currents to the input stage, canceling inherent transistor mismatches. This adjustment is especially valuable in DC-coupled precision integrators or low-gain instrumentation amplifiers where even 1 mV offset introduces measurable error.
Is the LM318PG4 RoHS compliant?
Yes, the LM318PG4 is RoHS compliant and green (halogen-free), with NiPdAu lead finish and no intentionally added antimony trioxide or brominated flame retardants. Its packaging meets EU RoHS Directive 2011/65/EU requirements for all ten restricted substances, including lead content below 0.1% by weight in homogeneous materials. This compliance is documented in TI's Package Option Addendum dated February 2020 and confirmed in the device's eco plan designation "Green (RoHS & no Sb/Br)".
LM318PG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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
LM318PG4 FAQ
1.How can I place an order for LM318PG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM318PG4 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 LM318PG4 reliable?
The price and inventory of LM318PG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM318PG4 is usually 5 days.
3.What payment methods are accepted for LM318PG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM318PG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM318PG4?
LM318PG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM318PG4 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 LM318PG4?
For technical support, including LM318PG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM318PG4 requirements.
6.How does Aetrix verify that LM318PG4 is sourced from the original manufacturer or authorized distributors?
All LM318PG4 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 LM318PG4 meets industry standards.
7.What is the process for return or replacement of LM318PG4?
All LM318PG4 units undergo pre-shipment inspection (PSI). If there is an issue with LM318PG4, 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 LM318PG4 part is unused and in its original packaging.
Return procedure for LM318PG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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