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Texas Instruments LM318MX
- Part No.:
- LM318MX
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM318MX.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,509
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Product details
Overview
LM318MX from Texas Instruments is a precision high-speed operational amplifier optimized for wide bandwidth and fast settling in analog signal conditioning circuits. 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 - making it suitable for A/D converter front-ends, active filters, and fast sample-and-hold circuits.
For engineers reviewing the LM318MX datasheet, LM318MX pinout, LM318MX application, or LM318MX equivalent, key selection criteria include guaranteed slew rate at temperature, input bias current stability across voltage rails, unity-gain stability with optional external compensation, and SOIC-8 package compatibility with automated assembly processes.
Technical Context
The LM318MX implements internally frequency-compensated unity-gain-stable architecture with bipolar input stage, enabling stable operation without external components while supporting feedforward compensation for inverting configurations to exceed 150 V/μs slew rate. Its input stage includes back-to-back diodes for differential input overload protection.
It features input offset voltage ≤10 mV, input bias current ≤500 nA (typical 150 nA), and large-signal voltage gain ≥25 V/mV at ±15 V supplies - all specified across its full 0°C to +70°C operating range. Output swing reaches ±12 V into 2 kΩ loads with ±15 V supplies.
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 - supports clean reproduction of fast-rising pulses (e.g., 10 V step in <200 ns) without slewing distortion. |
| Supply Voltage Range | ±5 V to ±20 V - accommodates industrial sensor interfaces and legacy ±12 V or ±15 V systems without level-shifting. |
| Input Bias Current | ≤500 nA max at 25°C - ensures low error in high-impedance transducer amplifiers (e.g., photodiode or piezoelectric sensors). |
| Operating Temperature | 0°C to +70°C - qualified for commercial-grade instrumentation, test equipment, and data acquisition modules. |
| Package Type | SOIC-8 (D package) - surface-mount compatible with standard reflow profiles (MSL Level-1, 260°C peak). |
| Input Protection | Back-to-back input diodes - limits differential input voltage to ±1 V, requiring series resistance if >±1 V differential stress is expected. |
Pinout & Package
LM318MX is housed in an 8-pin SOIC (Small Outline Integrated Circuit) package per JEDEC MS-012 variation AA, 3.9 mm body width, 1.75 mm max height, and 1.27 mm lead pitch. Pin 1 is located at the top-left corner with notch or beveled edge marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Inverting Input (–) | Differential input node | Accepts feedback network connection; requires guarding in high-Z applications to minimize leakage-induced offset. |
| Non-Inverting Input (+) | Differential input node | Reference point for common-mode voltage; tied to ground or reference in follower configurations. |
| Output | Amplified single-ended output | Capable of ±12 V swing into 2 kΩ; limited current output (~25 mA short-circuit) with thermal foldback. |
| Positive Supply (V+) | Power rail connection | Must be bypassed with 0.1 μF ceramic capacitor near pin to suppress high-frequency supply noise. |
| Negative Supply (V–) | Power rail connection | Requires symmetrical bypassing; asymmetry degrades PSRR and CMRR performance. |
| Offset Null (1) | Trim terminal for input offset | Connected to potentiometer wiper (10 kΩ ends to V+/V–) to null DC error in precision DC-coupled stages. |
| Offset Null (2) | Trim terminal for input offset | Paired with Pin 1 for external nulling; unused pins must remain unconnected or grounded via resistor divider. |
| NC | No connect | Internally unused; must be left floating - not tied to supply or ground to avoid parasitic coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Unity-gain stable internal compensation | Enables immediate use in voltage follower or gain-of-1 configurations without external capacitors - reduces BOM count and layout risk. |
| Feedforward compensation support | Allows >150 V/μs slew rate in inverting amplifiers via external capacitor, improving pulse fidelity in DAC output buffers. |
| Input/output overload protection | Integrated back-to-back diodes and current limiting prevent latch-up or damage during transient overvoltage or short-circuit events. |
| Wide supply range (±5 V to ±20 V) | Supports direct interface with legacy ±12 V or ±15 V systems and modern low-voltage ±5 V designs without external regulators. |
| 0.1% settling time <1 μs (with external cap) | Enables high-speed multiplexed data acquisition where channel switching demands sub-microsecond settling before ADC sampling. |
Applications
| High-Speed Data Acquisition | Active Filter Design |
|---|---|
|
Use Scenario: Front-end buffer and driver for 12-bit SAR ADC sampling at 1 MSPS with multiplexed inputs. IC Role / Device Role / Timing Role: Sample-and-hold amplifier providing low-output-impedance drive, fast settling (<800 ns to 0.1%), and rail-to-rail input common-mode range. Use Value: Eliminates need for external settling optimization circuitry; maintains linearity error <0.5 LSB across full temperature range. |
Use Scenario: 4th-order Butterworth low-pass filter with 1 MHz cutoff for anti-aliasing prior to digitization. IC Role / Device Role / Timing Role: High-Q gain stage in multiple-feedback topology, leveraging 15 MHz bandwidth to preserve phase margin at cutoff. Use Value: Achieves <−3 dB point within ±0.5% tolerance and group delay variation <50 ns across passband - critical for coherent signal reconstruction. |
| Fast Pulse Amplification | Instrumentation Signal Conditioning |
|
Use Scenario: Amplifying TTL-compatible logic pulses (10 ns rise time) for timing distribution in test fixtures. IC Role / Device Role / Timing Role: Non-inverting amplifier with gain = 2, configured for minimal propagation delay and overshoot control. Use Value: Delivers 10–90% rise time <25 ns and ringing <5% - preserves edge integrity for sub-100 ns timing windows. |
Use Scenario: First-stage preamplifier for bridge-based load cell outputs (2 mV/V sensitivity, 1 kHz bandwidth). IC Role / Device Role / Timing Role: Low-bias-current, low-noise gain block with adjustable offset nulling to reject common-mode drift. Use Value: Maintains <10 μV input-referred offset drift over 0–70°C, enabling <0.05% FS measurement accuracy without recalibration. |
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 |
|---|---|---|---|
| LM318M/NOPB | Same die, identical electrical specs, but supplied in tube packaging (95 pcs) vs. tape-and-reel (2500 pcs). | Preferred for prototyping or low-volume builds where reel handling is impractical. | Select LM318M/NOPB when manual placement or small-batch validation is required; LM318MX/NOPB is optimal for SMT production. |
| TL082IP | JFET-input, lower slew rate (13 V/μs), higher input impedance (>10¹² Ω), but only 3 MHz GBW and no guaranteed 0.1% settling spec. | Suitable for audio or low-frequency sensor buffering where speed is secondary to input impedance. | Choose TL082IP only if input bias current <200 pA is mandatory and bandwidth ≤1 MHz suffices; LM318MX remains superior for >5 MHz signal paths. |
Compared with LM318M/NOPB, LM318MX/NOPB offers identical performance with optimized logistics for high-volume SMT lines; versus TL082IP, LM318MX provides 3.8× higher slew rate and 5× greater bandwidth - essential for time-critical analog signal chains.
Availability
LM318MX is available at Aetrix Electronics and suitable for high-speed data acquisition, active filter design, fast pulse amplification, and instrumentation signal conditioning requiring stable component supply across commercial temperature ranges.
Supply support for LM318MX 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 connectivity technologies, with decades of heritage in precision op amp design and manufacturing.
The LM318MX 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 RF-grade amplifiers.
FAQ
What is the maximum operating junction temperature for LM318MX?
The LM318MX has a maximum junction temperature of 110°C, consistent with its 0°C to +70°C ambient rating. Thermal derating is required above 70°C ambient; the SOIC-8 package exhibits ~100°C/W junction-to-ambient thermal resistance, so power dissipation must be limited to ~330 mW at 70°C ambient to stay within safe junction limits. This value is confirmed in TI's SNOSBS8C datasheet Absolute Maximum Ratings table.
Does LM318MX require external compensation for unity-gain stability?
No, LM318MX is internally frequency-compensated for unity-gain stability and operates reliably in voltage-follower configuration without external components. However, external feedforward compensation can be added to boost slew rate beyond 150 V/μs in inverting applications, as documented in Figure 37 of the SNOSBS8C datasheet. The internal compensation ensures unconditional stability across all gains ≥1.
Can LM318MX drive capacitive loads directly?
LM318MX is not optimized for direct capacitive load driving; stability may degrade with loads >100 pF. Figure 40 in the SNOSBS8C datasheet recommends isolating capacitive loads using a series resistor (e.g., 10–50 Ω) between output and load capacitance. For loads >1 nF, a dedicated output isolation network or buffer stage is advised to prevent peaking or oscillation.
What is the input common-mode voltage range for LM318MX at ±15 V supplies?
At ±15 V supplies, the input common-mode voltage range for LM318MX is ±11.5 V, as specified in the Electrical Characteristics table of SNOSBS8C. This means both inputs must remain within −11.5 V to +11.5 V relative to ground to ensure proper operation and avoid phase reversal or increased input bias current. Exceeding this range risks degraded CMRR and potential output saturation.
Is LM318MX RoHS compliant and lead-free?
Yes, LM318MX/NOPB is RoHS compliant and features 100% matte tin (Sn) lead finish, as confirmed in TI's PACKAGE OPTION ADDENDUM dated 15-Jul-2026. It meets JEDEC Level-1 moisture sensitivity requirements and is rated for peak reflow temperatures up to 260°C, making it fully compatible with standard lead-free PCB assembly processes.
LM318MX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
LM318MX FAQ
1.How can I place an order for LM318MX through Aetrix?
Please submit a Request for Quotation (RFQ) for LM318MX 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 LM318MX reliable?
The price and inventory of LM318MX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM318MX is usually 5 days.
3.What payment methods are accepted for LM318MX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM318MX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM318MX?
LM318MX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM318MX 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 LM318MX?
For technical support, including LM318MX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM318MX requirements.
6.How does Aetrix verify that LM318MX is sourced from the original manufacturer or authorized distributors?
All LM318MX 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 LM318MX meets industry standards.
7.What is the process for return or replacement of LM318MX?
All LM318MX units undergo pre-shipment inspection (PSI). If there is an issue with LM318MX, 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 LM318MX part is unused and in its original packaging.
Return procedure for LM318MX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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