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Texas Instruments LM318H/NOPB
- Part No.:
- LM318H/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- TO-99-8 Metal Can
- Datasheet:
-
LM318H/NOPB.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT TO99-8
- Quantity:
- Payment:
- Shipping:
Inventory:1,727
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Product details
Overview
LM318H/NOPB from Texas Instruments is a precision high-speed operational amplifier optimized for wide bandwidth and fast settling in analog signal conditioning, active filtering, and data acquisition systems. It delivers 15 MHz small-signal bandwidth, 50 V/μs minimum slew rate, ±5V to ±20V dual-supply operation, and operates over 0°C to +70°C - with TO-99 metal-can package for thermal stability and low-noise performance.
For engineers reviewing the LM318H/NOPB datasheet, LM318H/NOPB pinout, LM318H/NOPB application, or LM318H/NOPB equivalent, key selection criteria include guaranteed slew rate under load, input bias current at temperature extremes, unity-gain stability without external compensation, and compatibility with fast sample-and-hold or A/D driver circuits requiring sub-microsecond settling.
Technical Context
The LM318H/NOPB uses internally compensated single-pole dominant-pole architecture enabling stable unity-gain operation without external components, yet supports feedforward compensation for inverting configurations to achieve >150 V/μs slew rate. Its input stage employs lateral PNP transistors to limit input bias current while maintaining DC precision.
It features input and output overload protection, internal current limiting, and operates with supply voltages as low as ±5V - making it suitable for both high-voltage industrial signal chains and lower-voltage mixed-signal interfaces where speed and DC accuracy must coexist.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Small-Signal Bandwidth | 15 MHz - enables accurate amplification of signals up to ~10 MHz in closed-loop gain ≥2 configurations. |
| Slew Rate | 50 V/μs min - ensures ≤200 ns rise time for 10 V step, critical for pulse amplification and fast DAC buffering. |
| Input Bias Current | 150–500 nA max (TA = 25°C) - low enough to avoid significant offset in high-impedance sensor interfaces. |
| Supply Voltage Range | ±5V to ±20V - supports rail-to-rail compatible signal swings in ±12V or ±15V industrial systems. |
| Operating Temperature | 0°C to +70°C - qualified for commercial-grade instrumentation, test equipment, and embedded control I/O stages. |
| Input Offset Voltage | 4 mV max - allows direct coupling in DC-critical paths without excessive nulling circuitry. |
| Large-Signal Voltage Gain | 25 V/mV min - provides ≥25,000 open-loop gain for precise closed-loop error correction in precision amplifiers. |
Pinout & Package
LM318H/NOPB is housed in an 8-pin TO-99 metal-can package (package code LMC), offering superior thermal dissipation and EMI shielding versus plastic packages - ideal for noise-sensitive analog front-ends.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Offset Null | Connects to external potentiometer for input offset voltage trimming; required only in ultra-precision DC-coupled applications. |
| 2 | Inverting Input (−) | Differential input node; high-impedance path with 1–3 MΩ input resistance and protected by back-to-back diodes. |
| 3 | Non-Inverting Input (+) | Differential input node; matched to Pin 2 for common-mode rejection; same protection and impedance. |
| 4 | V− Supply | Negative power rail connection; requires local 0.1 μF ceramic bypass capacitor to ground for stability. |
| 5 | Offset Null | Second terminal of offset trim network; used with Pin 1 to balance input stage quiescent current mismatch. |
| 6 | Output | Class-AB output stage capable of ±12 V swing into 2 kΩ load; includes short-circuit protection and thermal shutdown. |
| 7 | V+ Supply | Positive power rail connection; also requires local 0.1 μF ceramic bypass capacitor to ground. |
| 8 | NC | No internal connection; electrically isolated; may be grounded for mechanical shielding or left floating. |
Key Features
| Feature | Design Value |
|---|---|
| Internal Unity-Gain Compensation | Enables immediate use in unity-gain follower or buffer configurations without external capacitors - reduces BOM count and layout complexity. |
| Feedforward Compensation Support | Allows external capacitor from output to inverting input to boost inverting-mode slew rate beyond 150 V/μs - essential for high-speed summing or inverter-based DAC drivers. |
| Input/Output Overload Protection | Prevents latch-up or damage during transient overvoltage or short-circuit events - improves system robustness in unattended test equipment. |
| Pin Compatibility with General-Purpose Op Amps | Shares DIP-8 and TO-99 pinouts with LM741 and LM301 - simplifies drop-in upgrades in legacy designs requiring higher speed. |
| 0.1% Settling Time Optimization | Single external capacitor reduces 10 V step settling to <1 μs - meets timing requirements for 1-MSPS sampling systems. |
Applications
| Active Filter Design | High-Speed Data Acquisition |
|---|---|
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: Voltage-controlled voltage source (VCVS) implementing gain and pole placement; maintains phase margin across temperature. Use Value: 15 MHz bandwidth and 50 V/μs slew rate prevent group delay distortion and slew-induced harmonic generation in multi-pole topologies. | Use Scenario: Buffering analog outputs of 12-bit DACs driving multiplexed ADC inputs in automated test equipment. IC Role / Device Role / Timing Role: Fast-settling unity-gain buffer isolating DAC output from switching capacitance; settles to 0.1% in <800 ns per datasheet Figure 41. Use Value: Enables full-scale 10 V transitions within 1 μs, supporting ≥1 MSPS effective sampling rates without aperture uncertainty penalty. |
| Instrumentation Signal Conditioning | Oscillator & Waveform Generation |
Use Scenario: Front-end amplifier for thermocouple or strain gauge bridges with gain ≥100 and 50 Hz–10 kHz bandwidth. IC Role / Device Role / Timing Role: Low-drift, high-CMRR differential amplifier stage; rejects common-mode noise from long sensor leads. Use Value: 70 dB minimum CMRR and 65 dB SVRR ensure stable gain accuracy despite supply ripple or ground bounce in noisy industrial cabinets. | Use Scenario: Wein bridge oscillator generating low-distortion 10 kHz sine wave for calibration sources. IC Role / Device Role / Timing Role: Gain block sustaining oscillation with amplitude stabilization via JFET-based AGC; exploits fast settling to suppress startup overshoot. Use Value: 15 MHz bandwidth supports clean harmonic suppression; 50 V/μs slew rate prevents waveform clipping at peak amplitudes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM318N/NOPB | Same electrical specs but in 8-pin PDIP package; higher thermal resistance (100°C/W junction-to-ambient vs. 20°C/W case-to-ambient for TO-99). | Better suited for prototyping or low-power PCB layouts where through-hole mounting is preferred; less optimal for sustained high-output-current operation. | Select LM318N/NOPB when board space permits DIP footprint and thermal load is moderate; LM318H/NOPB preferred for thermally constrained or EMI-sensitive environments. |
| TL082CP | JFET-input architecture; lower input bias current (30 pA typ), but only 3 MHz bandwidth and 13 V/μs slew rate - no feedforward compensation support. | Applicable in DC-accurate, low-noise preamps but not in >500 kHz signal paths requiring fast settling or high slew. | Choose TL082CP only for high-Z sensor interfaces where speed is secondary; LM318H/NOPB remains necessary for bandwidth-critical signal routing. |
Compared with LM318N/NOPB, LM318H/NOPB offers superior thermal management and EMI immunity in metal-can form, while TL082CP trades speed for ultra-low input current - making LM318H/NOPB the sole choice when both 15 MHz bandwidth and robust 50 V/μs slew are mandatory.
Availability
LM318H/NOPB is available at Aetrix Electronics and suitable for active filter design, high-speed data acquisition, instrumentation signal conditioning, and oscillator & waveform generation requiring stable component supply across commercial temperature ranges.
Supply support for LM318H/NOPB 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and consumer applications.
The LM318 series belongs to TI's precision high-speed op amp product line, engineered specifically for applications demanding wide bandwidth, fast settling, and DC accuracy - such as A/D converter drivers, active filters, and sample-and-hold circuits.
FAQ
What is the maximum operating temperature range for LM318H/NOPB?
The LM318H/NOPB is specified for operation from 0°C to +70°C - matching the LM318-N commercial temperature grade. Its TO-99 metal-can package supports reliable thermal conduction, and the device's maximum junction temperature is rated at 110°C. This makes LM318H/NOPB suitable for enclosed instrumentation enclosures and non-extended-temperature industrial control modules where ambient stays within commercial limits.
Does LM318H/NOPB require external compensation capacitors for unity-gain stability?
No, LM318H/NOPB features internal frequency compensation optimized for stable unity-gain operation - no external capacitor is needed for basic follower or buffer use. However, external feedforward compensation (e.g., capacitor from output to inverting input) can be added to increase slew rate beyond 150 V/μs in inverting configurations. The LM318H/NOPB datasheet confirms this behavior in Figures 37 and 39, and explicitly states "internal unity gain frequency compensation" as a core feature.
Can LM318H/NOPB drive capacitive loads directly?
LM318H/NOPB is not optimized for direct heavy capacitive loading; driving >100 pF without isolation risks instability or ringing. The datasheet recommends using a small series resistor (e.g., 10–50 Ω) or dedicated isolation network (Figure 40) when interfacing with ADC input capacitance or long cables. This limitation arises from its high open-loop gain and bandwidth - so LM318H/NOPB must be applied with appropriate output-stage buffering in capacitive-load scenarios.
What is the typical input bias current of LM318H/NOPB at room temperature?
The typical input bias current of LM318H/NOPB at TA = 25°C is 250 nA, with a maximum of 500 nA across the 0°C to +70°C operating range. This value is confirmed in the Electrical Characteristics table on page 2 of the SNOSBS8C datasheet. The lateral PNP input stage enables this low bias current while preserving high slew rate - distinguishing LM318H/NOPB from general-purpose op amps like LM741 (typically 80–500 nA) and supporting high-impedance transducer interfaces.
Is LM318H/NOPB pin-compatible with LM741 or other legacy op amps?
Yes, LM318H/NOPB uses the standard 8-pin TO-99 pinout shared with LM741H, LM301H, and other metal-can op amps - Pins 2 (−IN), 3 (+IN), 4 (V−), 6 (OUT), and 7 (V+) align identically. This enables direct replacement in existing sockets or layouts where thermal and speed margins allow. However, due to its higher slew rate and bandwidth, layout parasitics (e.g., stray capacitance at Pin 6) must be minimized to avoid unintended oscillation - a consideration not present with slower legacy devices like LM741.
LM318H/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- TO-99-8 Metal Can
- Packaging:
- Box
- 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:
- TO-99-8
LM318H/NOPB FAQ
1.How can I place an order for LM318H/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM318H/NOPB 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 LM318H/NOPB reliable?
The price and inventory of LM318H/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM318H/NOPB is usually 5 days.
3.What payment methods are accepted for LM318H/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM318H/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM318H/NOPB?
LM318H/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM318H/NOPB 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 LM318H/NOPB?
For technical support, including LM318H/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM318H/NOPB requirements.
6.How does Aetrix verify that LM318H/NOPB is sourced from the original manufacturer or authorized distributors?
All LM318H/NOPB 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 LM318H/NOPB meets industry standards.
7.What is the process for return or replacement of LM318H/NOPB?
All LM318H/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM318H/NOPB, 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 LM318H/NOPB part is unused and in its original packaging.
Return procedure for LM318H/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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