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Texas Instruments LM218IDRQ1
- Part No.:
- LM218IDRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM218IDRQ1.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,177
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Product details
Overview
LM218IDRQ1 from Texas Instruments is an automotive-qualified, high-speed precision operational amplifier with 15 MHz small-signal bandwidth, 20 V/µs minimum slew rate, and ±5 V to ±20 V dual-supply operation. It delivers fast settling (<1 µs to 0.1% error), internal unity-gain compensation, and overload protection-used in A/D converters, active filters, sample-and-hold circuits, and oscillator designs.
For engineers reviewing the LM218IDRQ1 datasheet, LM218IDRQ1 pinout, LM218IDRQ1 application, or LM218IDRQ1 equivalent, key selection criteria include its automotive qualification (−40°C to +85°C), SOIC-8 packaging, input bias current ≤250 nA, common-mode range of ±11.5 V at ±15 V supplies, and ability to support feed-forward compensation for >150 V/µs slew rate in inverting configurations.
Technical Context
The LM218IDRQ1 employs a bipolar input stage enabling high slew rate and wide bandwidth while maintaining DC precision. Its internal frequency compensation ensures stable unity-gain operation without external components, yet supports optional external compensation via COMP1/COMP2/COMP3 pins for optimized performance in demanding applications.
It features balanced input offset voltage trimming (≤10 mV max at 25°C), robust input/output overload protection, and same pin assignments as industry-standard general-purpose op amps-enabling drop-in replacement in legacy designs where speed and settling time are critical constraints.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Small-Signal Bandwidth | 15 MHz typical - enables accurate amplification of signals up to ~10 MHz in closed-loop gain ≥2 configurations. |
| Slew Rate | 20 V/µs minimum - supports clean reproduction of fast-rising 10-V step signals with <50 ns rise time. |
| Input Bias Current | 250 nA maximum - minimizes DC error in high-impedance sensor interfaces and integrator circuits. |
| Supply Voltage Range | ±5 V to ±20 V - accommodates industrial and automotive rails including ±12 V and ±15 V systems. |
| Common-Mode Input Range | ±11.5 V at ±15 V supply - allows rail-to-rail input signal handling within 3.5 V of either supply. |
| Output Voltage Swing | ±12 V into 2 kΩ - delivers full-scale analog output in data acquisition front-ends with minimal headroom loss. |
| Unity-Gain Stability | Internally compensated - eliminates need for external compensation capacitors in standard unity-gain buffer use cases. |
Pinout & Package
LM218IDRQ1 is housed in an 8-pin SOIC (D package), 1.75 mm maximum height, RoHS-compliant, with moisture sensitivity level (MSL) Level-1 and lead finish NIPDAU.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: BAL/COMP1 | Offset null / compensation terminal | Connects to external potentiometer for input offset adjustment or capacitor for feed-forward compensation. |
| 2: IN− | Inverting input | Differential input node; internally protected by back-to-back base-emitter diodes against overvoltage. |
| 3: IN+ | Non-inverting input | Differential input node; shares same protection and bias current characteristics as IN−. |
| 4: VCC− | Negative supply rail | Accepts −5 V to −20 V; must be referenced to system ground or midpoint between supplies. |
| 5: COMP2 | Compensation terminal | Used with COMP1 and COMP3 to configure external frequency compensation networks for bandwidth/slew optimization. |
| 6: VCC+ | Positive supply rail | Accepts +5 V to +20 V; thermal design must account for θJA = 126°C/W. |
| 7: OUT | Amplifier output | Capable of driving 2 kΩ loads to ±12 V; includes short-circuit protection with unlimited duration below 75°C ambient. |
| 8: BAL/COMP3 | Offset null / compensation terminal | Second offset trim node; used with Pin 1 for balancing or as third node in multi-capacitor compensation topologies. |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | Qualified per AEC-Q100 Grade 2 (−40°C to +105°C junction), with extended temperature range (−40°C to +85°C ambient) and enhanced reliability testing. |
| Feed-forward compensation support | Enables slew rate boost to >150 V/µs and bandwidth doubling in inverting configurations using external RC networks on COMP pins. |
| Input/output overload protection | Prevents latch-up and damage during transient overvoltage or output short-circuit events across full operating temperature range. |
| Same pinout as general-purpose op amps | Direct replacement for legacy devices such as LM301A/LM709 in existing PCB layouts without redesign. |
| 0.1% settling time <1 µs | Reduces conversion dead time in successive-approximation ADC drivers and improves throughput in multiplexed data acquisition systems. |
Applications
| High-Speed Data Acquisition | Active Filter Design |
|---|---|
Use Scenario: Front-end driver for 12-bit SAR ADC sampling at 1 MSPS with ±10 V input range. IC Role / Device Role / Timing Role: Precision buffer and level-shifter with low distortion and sub-microsecond settling to minimize aperture uncertainty. Use Value: Achieves <0.1% settling in <1 µs, enabling full-scale accuracy without added acquisition delay or digital correction. | Use Scenario: 4th-order Butterworth low-pass filter with 1 MHz cutoff for anti-aliasing before digitization. IC Role / Device Role / Timing Role: High-fidelity gain stage with minimal phase shift and group delay variation near cutoff frequency. Use Value: 15 MHz bandwidth and 20 V/µs slew rate preserve filter response integrity up to 800 kHz without peaking or attenuation. |
| Oscillator Circuits | Sample-and-Hold Amplifiers |
Use Scenario: Wien-bridge oscillator generating stable 500 kHz sine wave for sensor excitation. IC Role / Device Role / Timing Role: Gain element in feedback loop with precise amplitude control and low harmonic distortion. Use Value: Low input bias current and high open-loop gain ensure stable oscillation amplitude with minimal drift over temperature. | Use Scenario: Hold amplifier in analog memory cell capturing transient pulse widths in motor control timing circuits. IC Role / Device Role / Timing Role: Fast-settling follower that acquires and holds voltage during 500 ns aperture window. Use Value: Slew rate >20 V/µs and 0.1% settling <1 µs prevent droop and ensure hold accuracy better than 12-bit LSB. |
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 |
|---|---|---|---|
| LM218DR | Same die, commercial-grade (0°C to +70°C), non-automotive qualified, no AEC-Q100 testing. | Lacks automotive reliability validation; unsuitable for under-hood or safety-critical vehicle subsystems. | Select LM218DR only for cost-sensitive industrial or lab equipment where extended temperature and qualification are not required. |
| OPA2350UA | FET-input, 38 MHz GBW, 22 V/µs slew, rail-to-rail output, but lower input bias current (0.5 pA) and no COMP pins for external tuning. | No feed-forward compensation capability; cannot match LM218IDRQ1's >150 V/µs inverting slew rate or 0.1% settling <1 µs. | Choose OPA2350UA when ultra-low input bias or rail-to-rail output is prioritized over extreme settling speed and external compensation flexibility. |
Compared with LM218DR and OPA2350UA, the LM218IDRQ1 uniquely combines automotive qualification, user-configurable compensation, and sub-microsecond settling-making it the only option among the three validated for high-reliability, high-speed analog signal conditioning in automotive ADAS and powertrain control modules.
Availability
LM218IDRQ1 is available at Aetrix Electronics and suitable for automotive ADAS sensor interfaces, industrial data acquisition systems, and high-speed test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM218IDRQ1 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 with emphasis on reliability, scalability, and automotive-grade quality.
The LM218 product line was designed specifically for high-speed precision analog signal conditioning in automotive and industrial environments where speed, DC accuracy, and ruggedness must coexist-targeting applications like engine control unit (ECU) signal chains and battery management system (BMS) front ends.
FAQ
What is the operating temperature range for the LM218IDRQ1?
The LM218IDRQ1 is rated for operation from −40°C to +85°C ambient temperature and is qualified to AEC-Q100 Grade 2 standards. Its virtual junction temperature can reach up to 150°C, and thermal design must respect θJA = 126°C/W. This range makes the LM218IDRQ1 suitable for under-dash automotive electronics and industrial control cabinets where ambient extremes occur.
Does the LM218IDRQ1 require external compensation capacitors?
No-the LM218IDRQ1 includes internal unity-gain frequency compensation, allowing stable operation without external components. However, external compensation via Pins 1 (BAL/COMP1), 5 (COMP2), and 8 (BAL/COMP3) is supported to increase slew rate beyond 150 V/µs or adjust bandwidth/stability trade-offs. The LM218IDRQ1 thus offers both plug-and-play simplicity and advanced tuning capability.
Is the LM218IDRQ1 pin-compatible with other op amps?
Yes-the LM218IDRQ1 uses the standard 8-pin SOIC (D package) footprint and has identical pin assignments to legacy general-purpose op amps such as the LM301A and LM709. This enables direct PCB-level replacement in existing designs without layout changes, provided supply and signal integrity requirements are verified for the higher speed and slew rate of the LM218IDRQ1.
What is the maximum output current capability of the LM218IDRQ1?
The LM218IDRQ1 does not specify a continuous output current rating in its datasheet, but its output is short-circuit protected with unlimited duration at case temperatures ≤85°C or ambient ≤75°C. Under typical load conditions (e.g., RL = 2 kΩ), it delivers ±12 V swing. For sustained high-current drive, external current-limiting or buffering is recommended, as the LM218IDRQ1 is optimized for voltage fidelity-not power delivery.
How does the LM218IDRQ1 handle input overvoltage conditions?
The LM218IDRQ1 incorporates internal back-to-back base-emitter diodes across its inputs, providing inherent overvoltage protection. If differential input voltage exceeds ~1 V, current flows through these diodes-requiring external series resistance to limit current to safe levels. Common-mode input voltage is limited to ±15 V or supply rail magnitude, whichever is smaller, ensuring robustness in noisy automotive environments.
LM218IDRQ1 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:
- 120 nA
- Voltage - Input Offset:
- 2 mV
- Current - Supply:
- 5mA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 10 V
- Voltage - Supply Span (Max):
- 40 V
- Operating Temperature:
- -25°C ~ 85°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LM218IDRQ1 FAQ
1.How can I place an order for LM218IDRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM218IDRQ1 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 LM218IDRQ1 reliable?
The price and inventory of LM218IDRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM218IDRQ1 is usually 5 days.
3.What payment methods are accepted for LM218IDRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM218IDRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM218IDRQ1?
LM218IDRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM218IDRQ1 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 LM218IDRQ1?
For technical support, including LM218IDRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM218IDRQ1 requirements.
6.How does Aetrix verify that LM218IDRQ1 is sourced from the original manufacturer or authorized distributors?
All LM218IDRQ1 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 LM218IDRQ1 meets industry standards.
7.What is the process for return or replacement of LM218IDRQ1?
All LM218IDRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM218IDRQ1, 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 LM218IDRQ1 part is unused and in its original packaging.
Return procedure for LM218IDRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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