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Texas Instruments LF411CDR
- Part No.:
- LF411CDR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LF411CDR.pdf
- Description:
- IC OPAMP JFET 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:979
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Product details
Overview
LF411CDR from Texas Instruments is a FET-input operational amplifier optimized for high-speed integrators, DAC interfaces, and sample-and-hold circuits. It delivers 50 pA typical input bias current, 0.5 V/µs slew rate, 4.5 MHz unity-gain bandwidth, ±14.95 V output swing (RL = 10 kΩ), and operates over 0°C to 70°C.
For engineers reviewing the LF411CDR datasheet, LF411CDR pinout, LF411CDR application, or LF411CDR equivalent, key selection criteria include low-noise FET input stage performance, SOIC-8 thermal resistance (197°C/W), and compatibility with ±3.5 V to ±18 V dual-supply systems requiring precision analog signal conditioning.
Technical Context
The LF411CDR implements a matched high-voltage FET input stage enabling ultra-low input bias current (50 pA typ) and high input impedance (10¹² Ω). Its internal compensation ensures stable unity-gain operation while supporting fast transient response via 0.5 V/µs slew rate and 4.5 MHz gain-bandwidth product.
Designed for dual-supply operation, it accepts ±3.5 V to ±18 V rails and maintains specified performance across 0°C to 70°C ambient. Input common-mode range extends from −11.5 V to +14.5 V with ±2 mV max input offset voltage at 25°C, making it suitable for DC-coupled precision amplification and feedback control loops.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input bias current | 50 pA typical - enables high-impedance sensor interfacing without significant DC error |
| Slew rate | 0.5 V/µs - supports moderate-speed signal conditioning in data acquisition front-ends |
| Unity-gain bandwidth | 4.5 MHz - allows stable closed-loop operation up to ~100 kHz with reasonable phase margin |
| Input offset voltage | 2 mV max at 25°C - defines minimum resolvable DC signal in precision amplification |
| Supply voltage range | ±3.5 V to ±18 V - accommodates industrial and test equipment power architectures |
| Output voltage swing | ±14.95 V (RL = 10 kΩ) - delivers near-rail dynamic range into medium-impedance loads |
| Input noise current | 2 fA/√Hz typical - critical for low-current photodiode or piezoelectric transducer amplification |
Pinout & Package
LF411CDR is housed in an 8-pin SOIC (D) package with 1.75 mm maximum height, tape-and-reel packaging (2500 units/reel), and RoHS-compliant NiPdAu lead finish. Thermal resistance θJA is 197°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | NC | No connection - must remain unconnected per datasheet |
| 2 | IN– | Inverting input - primary feedback node in standard op-amp configurations |
| 3 | IN+ | Non-inverting input - used for reference or signal injection in follower/buffer topologies |
| 4 | VCC– | Negative supply rail - establishes lower operating voltage boundary for dual-supply operation |
| 5 | NC | No connection - must remain unconnected per datasheet |
| 6 | OUT | Analog output - drives external load or next-stage input with ±14.95 V swing capability |
| 7 | VCC+ | Positive supply rail - establishes upper operating voltage boundary for dual-supply operation |
| 8 | NC | No connection - must remain unconnected per datasheet |
Key Features
| Feature | Design Value |
|---|---|
| FET-input architecture | Enables 10¹² Ω input impedance and 50 pA bias current for minimal loading of high-Z sources |
| Low input noise current | 2 fA/√Hz typical - preserves SNR in current-mode transducer amplification |
| Low supply current | 560 µA typical - reduces power budget impact in multi-channel analog signal chains |
| Matched high-voltage FET pair | Ensures low input offset voltage drift (10–20 µV/°C) and stable DC performance over temperature |
| Internal frequency compensation | Guarantees unity-gain stability without external components in standard configurations |
Applications
| High-Speed Integrator | Digital-to-Analog Converter Interface |
|---|---|
Use Scenario: Precision analog integration of fast-switching control signals in servo loop compensation networks. IC Role / Device Role / Timing Role: Integrator core with low input bias current minimizing drift-induced error accumulation. Use Value: 50 pA input bias current limits integration error to <1 µV/s under 1 V input, enabling long time-constant stability. | Use Scenario: Buffering and scaling output of 12-bit DACs in automated test equipment where linearity and settling are critical. IC Role / Device Role / Timing Role: Output amplifier with 0.5 V/µs slew rate and 4.5 MHz bandwidth ensuring sub-1 µs settling to 0.1%. Use Value: ±14.95 V output swing preserves full DAC dynamic range when driving 10 kΩ loads. |
| Sample-and-Hold Circuit | Photodiode Transimpedance Amplifier |
Use Scenario: Holding analog voltage levels during ADC conversion cycles in multiplexed data acquisition systems. IC Role / Device Role / Timing Role: High-input-impedance buffer isolating hold capacitor from source impedance variations. Use Value: 10¹² Ω input resistance minimizes charge leakage, extending hold time beyond 100 ms at room temperature. | Use Scenario: Converting low-level photocurrents (pA–nA range) from scientific-grade photodiodes into measurable voltage signals. IC Role / Device Role / Timing Role: Low-noise transimpedance amplifier leveraging 2 fA/√Hz input noise current and high ZIN. Use Value: Ultra-low input noise current prevents degradation of shot-noise-limited detection sensitivity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FET-input op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC27L4CDR | Lower supply current (125 µA), slower slew rate (0.035 V/µs), narrower bandwidth (1.7 kHz) | Better suited for ultra-low-power battery-operated sensors; not viable for >10 kHz signal paths | Select when power budget <200 µA dominates over speed requirements |
| OPA140AIDR | Higher precision (125 µV max VIO), lower noise (5.1 nV/√Hz), higher cost, same SOIC-8 footprint | Targeted at metrology-grade instrumentation where offset and voltage noise dominate design constraints | Select when 12-bit+ DC accuracy and sub-10 nV/√Hz voltage noise are mandatory |
Compared with LF411CDR, TLC27L4CDR trades speed and drive strength for micro-power operation, while OPA140AIDR delivers superior DC precision and voltage noise at higher cost and complexity-neither is pin-compatible, but both serve adjacent FET-input op-amp use cases.
Availability
LF411CDR is available at Aetrix Electronics and suitable for high-speed integrators, DAC interfaces, and sample-and-hold circuits requiring stable component supply across industrial automation, test instrumentation, and analog signal processing platforms.
Supply support for LF411CDR 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 digital signal solutions for industrial, automotive, and communications markets.
The LF411 series belongs to TI's legacy precision analog portfolio, designed specifically for cost-sensitive, high-input-impedance applications demanding reliable FET-input performance in commercial-temperature environments.
FAQ
What is the operating temperature range for the LF411CDR?
The LF411CDR is characterized for operation from 0°C to 70°C, matching the "C" suffix grade. This commercial temperature range makes it suitable for non-automotive, non-military applications such as benchtop test equipment, industrial controllers, and consumer-grade audio signal paths. The LF411CDR does not meet extended-temperature specifications - for –40°C to +85°C operation, the LF411IDR variant must be selected.
Does the LF411CDR require external compensation for unity-gain stability?
No, the LF411CDR features internal frequency compensation optimized for stable unity-gain operation. Its 4.5 MHz gain-bandwidth product and 0.5 V/µs slew rate are specified under unity-gain conditions without added external components. This eliminates layout complexity and ensures predictable phase margin in standard inverting and non-inverting configurations, as confirmed in Section 5.3 of the official TI datasheet SLOS011D.
What are the no-connect (NC) pins on the LF411CDR, and how should they be handled?
The LF411CDR has NC pins at positions 1, 5, and 8. Per TI's datasheet Table 4-1, these terminals must remain unconnected - no routing, grounding, or capacitive loading is permitted. Leaving them floating is required; intentional connection may disrupt internal biasing or cause parametric deviation. This applies strictly to the LF411CDR in SOIC-8 packaging and is not interchangeable with older JFET-based variants that used pins 1 and 5 for offset nulling.
How does the input bias current of the LF411CDR affect high-impedance sensor interfacing?
The LF411CDR's 50 pA typical input bias current directly determines DC error when interfacing with high-impedance sources like piezoelectric sensors or pH electrodes. For example, with a 10 MΩ source impedance, this bias current introduces only 0.5 µV of offset - negligible in most 12-bit systems. However, designers must still guard against PCB leakage paths, as contamination or humidity can easily exceed this level, making proper layout and conformal coating essential for achieving the LF411CDR's specified performance.
Is the LF411CDR RoHS compliant and what is its moisture sensitivity level?
Yes, the LF411CDR is RoHS compliant with NiPdAu lead finish and carries a JEDEC MSL Level-1 rating (unlimited floor life at ≤30°C/60% RH), meaning it can be assembled without baking or special handling. This simplifies manufacturing flow for high-volume PCB assembly. The MSL-1 classification is verified in TI's PACKAGE OPTION ADDENDUM dated 20-Aug-2025 and applies specifically to the LF411CDR variant in SOIC-8 packaging.
LF411CDR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- J-FET
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 13V/µs
- Gain Bandwidth Product:
- 3 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 50 pA
- Voltage - Input Offset:
- 800 µV
- Current - Supply:
- 2mA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 7 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LF411CDR FAQ
1.How can I place an order for LF411CDR through Aetrix?
Please submit a Request for Quotation (RFQ) for LF411CDR 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 LF411CDR reliable?
The price and inventory of LF411CDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LF411CDR is usually 5 days.
3.What payment methods are accepted for LF411CDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LF411CDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LF411CDR?
LF411CDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LF411CDR 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 LF411CDR?
For technical support, including LF411CDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LF411CDR requirements.
6.How does Aetrix verify that LF411CDR is sourced from the original manufacturer or authorized distributors?
All LF411CDR 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 LF411CDR meets industry standards.
7.What is the process for return or replacement of LF411CDR?
All LF411CDR units undergo pre-shipment inspection (PSI). If there is an issue with LF411CDR, 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 LF411CDR part is unused and in its original packaging.
Return procedure for LF411CDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LF411CDR Tags
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