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Texas Instruments LM318M
- Part No.:
- LM318M
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM318M.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,170
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Product details
Overview
LM318M from Texas Instruments is a precision high-speed operational amplifier designed for wide-bandwidth signal conditioning in analog front-ends, active filters, and fast sample-and-hold circuits. It delivers 15 MHz small-signal bandwidth, 50 V/μs guaranteed slew rate, ±5V to ±20V dual-supply operation, and operates across 0°C to +70°C. Its internal unity-gain compensation enables stable 1× gain configurations without external components.
For engineers reviewing the LM318M datasheet, LM318M pinout, LM318M application, or LM318M equivalent, key selection criteria include its guaranteed 50 V/μs slew rate at ±15V supplies, 250 nA maximum input bias current at 25°C, 15 MHz bandwidth, input/output overload protection, and SOIC-8 package compatibility with legacy DIP-8 footprints via adapter layouts.
Technical Context
The LM318M implements a fully compensated voltage-feedback architecture optimized for unity-gain stability. Its internal compensation network sets dominant-pole frequency near 15 MHz, enabling predictable closed-loop response without external capacitors - unlike decompensated op-amps requiring external compensation networks.
It features bipolar input stage with back-to-back diode clamping for ±1V differential input protection, output current limiting, and thermal shutdown. The SOIC-8 package provides improved thermal resistance over TO-99 (100°C/W junction-to-ambient) and supports surface-mount assembly with JEDEC MS-012AA compliance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Small Signal Bandwidth | 15 MHz - Enables accurate amplification of signals up to 15 MHz without significant gain roll-off. |
| Slew Rate | 50 V/μs min - Supports clean reproduction of fast-rising edges in pulse and video applications. |
| Input Bias Current | 250 nA max at 25°C - Minimizes DC error in high-impedance sensor interfaces and integrators. |
| Supply Voltage Range | ±5V to ±20V - Compatible with industrial ±15V rails and low-voltage ±5V systems. |
| Operating Temperature | 0°C to +70°C - Qualified for commercial-grade embedded control and instrumentation. |
| Input Offset Voltage | 4 mV max - Limits initial DC error in precision gain stages without trimming. |
| Output Swing | ±12 V min into 2 kΩ - Delivers >80% of rail-to-rail swing for dynamic range preservation. |
Pinout & Package
LM318M is housed in an 8-pin SOIC (Small Outline Integrated Circuit) package per JEDEC MS-012AA, with 1.27 mm pitch, 3.9 mm body width, and 1.75 mm max height. Pin 1 is marked by a beveled corner or dot; leads are tin (Sn) finished with MSL Level-1 rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Inverting Input (–) | Differential input node | Accepts feedback signal; high-impedance node sensitive to layout parasitics. |
| Non-Inverting Input (+) | Differential input node | Reference input for follower or summing configurations; requires matched trace impedance. |
| Output | Amplified signal source | Capable of ±12 V swing into 2 kΩ; includes short-circuit protection. |
| Positive Supply (V+) | Power rail connection | Must be bypassed with 0.1 μF ceramic capacitor close to pin for stability. |
| Negative Supply (V–) | Power rail connection | Requires symmetric bypassing; mismatched decoupling induces CMRR degradation. |
| Offset Null (1) | DC offset adjustment | Connects to potentiometer wiper for manual nulling; unused pins left open. |
| Offset Null (2) | DC offset adjustment | Connects to potentiometer ends; critical for sub-mV precision applications. |
| NC | No connect | Internally unconnected; must remain floating - no routing or grounding permitted. |
Key Features
| Feature | Design Value |
|---|---|
| Internal unity-gain compensation | Eliminates need for external compensation components in most 1× to 10× gain configurations. |
| Input and output overload protection | Prevents latch-up or damage during transient overvoltage or short-circuit events. |
| Pin compatibility with general-purpose op-amps | SOIC-8 footprint matches LM741, TL081, and OP07 layouts - simplifies drop-in upgrades. |
| Feedforward compensation support | Enables >150 V/μs slew rate in inverting configurations using external capacitor network. |
| 0.1% settling time <1 μs | Achievable with single external capacitor - critical for high-speed data acquisition systems. |
Applications
| Active Filter Design | Fast Sample-and-Hold |
|---|---|
Use Scenario: Second-order Sallen-Key low-pass filter operating at 1 MHz cutoff in medical ECG signal conditioning. IC Role / Device Role / Timing Role: Voltage-controlled voltage source implementing gain and phase shaping with minimal group delay distortion. Use Value: 15 MHz bandwidth ensures flat passband response and sharp roll-off beyond cutoff without peaking. | Use Scenario: Acquisition stage in 12-bit ADC subsystem capturing transient pulses from ultrasonic transducers. IC Role / Device Role / Timing Role: Buffer amplifier holding sampled voltage during ADC conversion cycle. Use Value: 50 V/μs slew rate and <1 μs 0.1% settling enable accurate capture of 10 V step inputs within sampling window. |
| Oscillator Circuits | D/A Converter Output Stage |
Use Scenario: Wein bridge sine wave generator producing 500 kHz test signal for RF calibration. IC Role / Device Role / Timing Role: Gain element sustaining oscillation with amplitude stabilization via thermistor feedback. Use Value: Low distortion (<0.5% THD) and stable phase margin ensure spectrally pure output without harmonic buildup. | Use Scenario: Current-to-voltage converter driving 50 Ω coaxial line from R-2R DAC output in arbitrary waveform generator. IC Role / Device Role / Timing Role: High-speed output driver delivering fast edge transitions to minimize timing jitter. Use Value: 15 MHz bandwidth preserves rise/fall times of DAC-generated square waves up to 1 MHz fundamental. |
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 |
|---|---|---|---|
| LM318N/NOPB | Same electrical specs, but in 8-pin PDIP package with through-hole mounting. | Preferred for prototyping, breadboarding, or legacy through-hole PCBs. | Select LM318N/NOPB when manual assembly or socket-based testing is required. |
| TL081CDR | Lower 3 MHz bandwidth, 13 V/μs slew rate, JFET input (50 pA bias current), same SOIC-8 footprint. | Better for low-input-current, low-power, audio-frequency applications - not suitable for >5 MHz signal paths. | Choose TL081CDR only if bandwidth and slew rate requirements are relaxed and ultra-low input bias is prioritized. |
Compared with LM318N/NOPB, LM318M offers identical performance in a surface-mount package for automated production; versus TL081CDR, LM318M delivers triple the bandwidth and nearly four times the slew rate - essential for time-critical analog signal chains where fidelity at >1 MHz matters.
Availability
LM318M is available at Aetrix Electronics and suitable for active filter design, fast sample-and-hold circuits, oscillator circuits, and D/A converter output stages requiring stable component supply across commercial temperature ranges and long-lifecycle production programs.
Supply support for LM318M 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 50 years of op-amp innovation.
The LM318M belongs to TI's legacy high-speed op-amp product line, engineered specifically for applications demanding both wide bandwidth and robust DC precision - bridging the gap between general-purpose and specialized RF amplifiers.
FAQ
What is the maximum supply voltage rating for LM318M?
The LM318M has an absolute maximum supply voltage rating of ±20V. Operation beyond this limit risks permanent damage to the internal bipolar junction transistors. For reliable long-term use, TI recommends staying within ±18V under normal conditions, especially at elevated ambient temperatures where thermal derating applies.
Does LM318M require external compensation capacitors?
No, LM318M does not require external compensation capacitors for unity-gain or inverting configurations - it features internal frequency compensation optimized for stability at all gains ≥1. External feedforward or overcompensation networks may be added only to enhance slew rate or improve settling time, per Figures 37 and 41 in the datasheet.
Can LM318M drive capacitive loads directly?
LM318M is not optimized for direct capacitive load driving above ~100 pF. For larger loads (e.g., cables or ADC input capacitance), TI recommends isolating the output using a series resistor (e.g., 10–50 Ω) as shown in Figure 40, or adding a small isolation capacitor (≥50 pF) in parallel with feedback to maintain phase margin and prevent ringing.
What is the typical input offset voltage of LM318M at room temperature?
The typical input offset voltage of LM318M at 25°C is 2 mV, with a maximum specification of 4 mV across the 0°C to +70°C operating range. This value is measured under standard conditions (±15V supplies, RL ≥2 kΩ) and reflects inherent transistor matching limitations in the bipolar input stage of the LM318M.
Is LM318M RoHS compliant and lead-free?
Yes, LM318M/NOPB.B is RoHS compliant and lead-free. Its lead finish is pure tin (Sn), and it carries MSL Level-1 (unlimited floor life at ≤30°C/60% RH), per TI's PACKAGE OPTION ADDENDUM. The "NOPB" suffix explicitly denotes lead-free packaging, verified in TI's official ordering documentation.
LM318M Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LM318M FAQ
1.How can I place an order for LM318M through Aetrix?
Please submit a Request for Quotation (RFQ) for LM318M 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 LM318M reliable?
The price and inventory of LM318M are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM318M is usually 5 days.
3.What payment methods are accepted for LM318M?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM318M transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM318M?
LM318M orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM318M 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 LM318M?
For technical support, including LM318M datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM318M requirements.
6.How does Aetrix verify that LM318M is sourced from the original manufacturer or authorized distributors?
All LM318M 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 LM318M meets industry standards.
7.What is the process for return or replacement of LM318M?
All LM318M units undergo pre-shipment inspection (PSI). If there is an issue with LM318M, 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 LM318M part is unused and in its original packaging.
Return procedure for LM318M:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM318M Tags
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