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Texas Instruments LM318PSR
- Part No.:
- LM318PSR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
LM318PSR.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,739
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Product details
Overview
LM318PSR from Texas Instruments is a precision high-speed operational amplifier designed for wide-bandwidth analog signal conditioning in data acquisition and instrumentation systems. It delivers 15 MHz unity-gain bandwidth, ≥50 V/µs slew rate (min), ±5 V to ±20 V dual-supply operation, and internal frequency compensation - enabling stable unity-gain operation without external components. It is commonly used in active filters, sample-and-hold circuits, and A/D converter front-ends.
For engineers reviewing the LM318PSR datasheet, LM318PSR pinout, LM318PSR application, or LM318PSR equivalent, key selection considerations include its 8-pin SO (PS) package thermal performance (θJA = 95°C/W), input offset voltage ≤10 mV at 25°C, and guaranteed slew rate under load - critical for fast-settling, low-distortion amplification in time-critical analog stages.
Technical Context
The LM318PSR implements a bipolar input stage with internal unity-gain compensation, supporting stable operation from DC to 15 MHz without external capacitors. Its architecture enables feed-forward compensation in inverting configurations to boost slew rate beyond 150 V/µs and double small-signal bandwidth.
It features input overload protection via back-to-back base-emitter diodes, output short-circuit immunity, and rail-to-rail common-mode input range (±11.5 V at ±15 V supplies). The device operates across 0°C to 70°C ambient temperature and supports 0.1% settling in under 1 µs with optional external capacitor compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Unity-Gain Bandwidth | 15 MHz typical - enables stable amplification of signals up to 15 MHz without oscillation. |
| Slew Rate | ≥50 V/µs minimum - ensures <1 µs 0.1% settling for 10 V step inputs, critical for sample-and-hold fidelity. |
| Input Offset Voltage | ≤10 mV at 25°C - limits DC error in precision gain stages and sensor signal chains. |
| Supply Voltage Range | ±5 V to ±20 V - supports flexible rail selection for dynamic range optimization in mixed-signal systems. |
| Input Bias Current | ≤500 nA maximum over full temperature range - minimizes voltage drop across high-impedance source networks. |
| Common-Mode Input Range | ±11.5 V at ±15 V supply - allows direct interfacing with ±10 V industrial sensor outputs. |
| Thermal Resistance θJA | 95°C/W (SO-PS package) - defines power dissipation limit (e.g., 420 mW max at 70°C ambient) for thermal design. |
Pinout & Package
The LM318PSR is housed in an 8-pin Small Outline (SO) package (PS), compliant with JEDEC MS-012 variation AA, with 1.27 mm lead pitch and 1.75 mm max height. Pin 1 is marked by a beveled corner or dot; leads are RoHS-compliant NiPdAu finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - BAL/COMP1 | Offset null / compensation terminal | Connects to external potentiometer for input offset trimming or to capacitor for overcompensation stability control. |
| 2 - IN– | Inverting input | Primary feedback node in closed-loop configurations; accepts differential input signals or feedback network connections. |
| 3 - IN+ | Non-inverting input | Reference input for follower, summing, or differential configurations; protected by internal clamp diodes. |
| 4 - VCC– | Negative supply rail | Ground reference for negative supply; must be decoupled locally to minimize noise coupling into input stage. |
| 5 - COMP2 | Compensation terminal | Used with external capacitor to adjust dominant pole location - enables bandwidth/speed vs. stability trade-off. |
| 6 - VCC+ | Positive supply rail | Power input for positive rail; requires local 0.1 µF ceramic decoupling adjacent to pin. |
| 7 - OUT | Amplifier output | Capable of driving ≥2 kΩ loads; short-circuit protected to either rail or ground indefinitely at ≤70°C ambient. |
| 8 - BAL/COMP3 | Offset null / compensation terminal | Second nulling point for balanced offset adjustment; also used with COMP2 for feed-forward compensation. |
Key Features
| Feature | Design Value |
|---|---|
| Internal unity-gain compensation | Eliminates need for external compensation components in standard gain ≥1 configurations - reduces BOM count and layout area. |
| Feed-forward compensation support | Enables >150 V/µs slew rate and doubled bandwidth in inverting topologies - improves transient response in pulse amplification. |
| Input/output overload protection | Clamp diodes on inputs and short-circuit tolerant output allow robust operation in noisy or fault-prone environments. |
| Same pin assignments as general-purpose op amps | Direct replacement for legacy designs using LM741, LM301, or similar 8-pin DIP/SO op amps - no PCB redesign required. |
| 0.1% settling time <1 µs | Achievable with single external capacitor on COMP2 - meets timing requirements for 1-MSPS+ data acquisition systems. |
Applications
| Active Filter Design | Sample-and-Hold Amplifier |
|---|---|
Use Scenario: Second-order low-pass filter for anti-aliasing prior to ADC sampling at 500 kSPS. IC Role / Device Role / Timing Role: High-fidelity signal conditioning amplifier with minimal phase distortion and group delay variation across passband. Use Value: 15 MHz bandwidth and 50 V/µs slew rate prevent slew-induced harmonic distortion in 100 kHz sinusoidal inputs. |
Use Scenario: Hold amplifier in a 12-bit successive-approximation ADC system requiring <1 µs acquisition time. IC Role / Device Role / Timing Role: Fast-settling buffer that drives the ADC input capacitor during track mode and isolates it during hold. Use Value: Guaranteed <1 µs 0.1% settling with external compensation enables reliable 1-MSPS throughput without aperture uncertainty. |
| A/D Converter Front-End | High-Speed Oscillator Core |
Use Scenario: Single-ended to differential driver for a pipeline ADC with ±10 V full-scale range. IC Role / Device Role / Timing Role: Precision gain stage with matched input bias current and low offset to preserve DC accuracy and linearity. Use Value: ≤10 mV input offset and ≤500 nA input bias current minimize integral nonlinearity (INL) errors in DC-coupled sensor interfaces. |
Use Scenario: Gain block in a Wien-bridge oscillator generating 100 kHz sine wave with THD <0.5%. IC Role / Device Role / Timing Role: Linear amplification element sustaining oscillation with controlled loop gain and minimal phase shift. Use Value: Internal compensation and 15 MHz bandwidth ensure stable oscillation without parasitic peaking or amplitude collapse. |
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 | FET-input (IB ≤10 pA), 80 MHz GBW, 350 V/µs slew rate; requires external compensation. | Better for ultra-high-Z sources (e.g., photodiode transimpedance); higher power (12 mA ICC) and cost. | Choose OPA637BP when input bias current <100 pA is mandatory and layout allows external compensation. |
| LM6362M | CMOS-input, 100 MHz GBW, 1000 V/µs slew rate; rail-to-rail output; fixed internal compensation. | Superior speed and drive capability but limited to single-supply (2.7–12 V); no dual-rail flexibility. | Choose LM6362M for battery-powered, high-speed single-supply systems where ±15 V rails are unavailable. |
Compared with OPA637BP and LM6362M, the LM318PSR provides proven dual-supply compatibility, internal compensation simplicity, and industrial temperature-range reliability - making it optimal for legacy-replacement and cost-sensitive high-speed analog signal paths where FET input or rail-to-rail output are not required.
Availability
LM318PSR is available at Aetrix Electronics and suitable for active filter design, sample-and-hold amplifier circuits, and A/D converter front-end applications requiring stable component supply, long-term obsolescence mitigation, and consistent parametric performance across production lots.
Supply support for LM318PSR 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 precision analog ICs.
The LM318PSR belongs to TI's legacy precision op amp product line, engineered for high-speed, wide-bandwidth analog signal conditioning in test equipment, industrial control, and data acquisition systems where reliability and parameter consistency are critical.
FAQ
What is the maximum operating temperature range for the LM318PSR?
The LM318PSR is specified for operation from 0°C to 70°C ambient temperature. This commercial-grade range aligns with its intended use in industrial instrumentation and data acquisition systems where environmental control is maintained. Exceeding 70°C ambient may degrade slew rate, offset voltage drift, and long-term reliability - the device's absolute maximum junction temperature is 150°C, but sustained operation above 70°C ambient requires careful thermal design using its 95°C/W θJA.
Does the LM318PSR require external compensation components for unity-gain stability?
No, the LM318PSR features internal unity-gain frequency compensation, allowing stable operation at gain ≥1 without external capacitors. However, external compensation via pins 1 (BAL/COMP1), 5 (COMP2), and 8 (BAL/COMP3) is supported for specialized configurations - such as feed-forward compensation to increase slew rate beyond 150 V/µs in inverting amplifiers or overcompensation for enhanced phase margin in high-precision integrators. The internal compensation remains active unless intentionally overridden.
What is the input offset voltage specification for the LM318PSR across temperature?
The LM318PSR has a maximum input offset voltage of 10 mV at 25°C and up to 15 mV across its full operating range (0°C to 70°C). This parameter is measured under open-loop conditions with ±15 V supplies. For applications demanding tighter DC accuracy, pin 1 and pin 8 support external nulling via a 10 kΩ potentiometer - reducing residual offset to <1 mV in production calibration. The LM318PSR's offset drift is typically 10 µV/°C, contributing predictably to total error budgets.
Can the LM318PSR drive a 600 Ω load effectively?
The LM318PSR is characterized for RL ≥ 2 kΩ in datasheet specifications, and while it can drive lower impedances, sustained 600 Ω loading risks thermal overload and reduced slew rate due to increased output current demand (up to ±20 mA). Its output stage is short-circuit protected but not optimized for continuous 600 Ω loads. For such applications, consider buffering with a dedicated line driver or selecting a higher-output-current op amp like the LM6361. Always verify thermal rise using θJA = 95°C/W and actual power dissipation in the LM318PSR layout.
Is the LM318PSR pin-compatible with the LM741 in SO-8 packages?
Yes, the LM318PSR uses the same 8-pin SO (PS) footprint and pinout as industry-standard general-purpose op amps including the LM741, LM301, and TL081 - specifically: Pin 1 (offset null), Pin 2 (inverting input), Pin 3 (non-inverting input), Pin 4 (V–), Pin 5 (compensation), Pin 6 (V+), Pin 7 (output), Pin 8 (offset null). This allows direct drop-in replacement in existing SO-8 layouts, preserving PCB design integrity while upgrading bandwidth and slew rate. No trace modifications are needed.
LM318PSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- 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-SO
LM318PSR FAQ
1.How can I place an order for LM318PSR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM318PSR 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 LM318PSR reliable?
The price and inventory of LM318PSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM318PSR is usually 5 days.
3.What payment methods are accepted for LM318PSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM318PSR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM318PSR?
LM318PSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM318PSR 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 LM318PSR?
For technical support, including LM318PSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM318PSR requirements.
6.How does Aetrix verify that LM318PSR is sourced from the original manufacturer or authorized distributors?
All LM318PSR 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 LM318PSR meets industry standards.
7.What is the process for return or replacement of LM318PSR?
All LM318PSR units undergo pre-shipment inspection (PSI). If there is an issue with LM318PSR, 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 LM318PSR part is unused and in its original packaging.
Return procedure for LM318PSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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