Texas Instruments LF411ID

Overview

LF411ID from Texas Instruments is a JFET-input operational amplifier designed for precision analog signal conditioning in industrial and instrumentation systems. It delivers 50 pA typical input bias current, 0.01 pA/√Hz typical input noise current, and 8 V/µs minimum slew rate, enabling high-fidelity amplification in sample-and-hold circuits and DAC output buffers.

For engineers reviewing the LF411ID datasheet, LF411ID pinout, LF411ID application, or LF411ID equivalent, key selection criteria include its –40°C to 85°C operating temperature range, SOIC-8 package, low 1/f noise corner (50 Hz typ), and compatibility with ±15 V dual supplies in high-impedance sensor interface designs.

Technical Context

The LF411ID uses matched high-voltage JFET input transistors to achieve ultra-low input bias and offset currents while maintaining high DC gain (25 V/mV min) and wide common-mode input range (±11 V). Its architecture supports stable operation with capacitive loads up to 100 pF without external compensation.

It features internal frequency compensation for unity-gain stability, a 2.7 MHz typical unity-gain bandwidth, and rail-to-rail output swing capability of ±12 V into 10 kΩ - all within a 2 mA typical supply current budget.

Key Specifications

Pinout & Package

LF411ID is housed in an 8-pin SOIC (D) package with standard pin spacing (1.27 mm), 5.3 mm body width, and JEDEC-compliant thermal profile (θ_JA = 197°C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar JFET-input op-amp applications.

Compared with TLC27L2IDR and OPA140AIDR, the LF411ID offers balanced performance across speed (2.7 MHz GBW), noise (18 nV/√Hz), and bias current (50 pA) at industrial temperature range - making it optimal for cost-sensitive, medium-speed analog signal chains where JFET input integrity is essential.

Availability

LF411ID is available at Aetrix Electronics and suitable for industrial instrumentation, sensor signal conditioning, and legacy analog subsystems requiring stable component supply across extended temperature ranges.

Supply support for LF411ID 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 since 1930.

The LF411ID belongs to TI's legacy JFET-input op-amp family, engineered for robustness and precision in industrial analog signal paths where low bias current and wide supply range are mandatory.

FAQ

What is the operating temperature range for the LF411ID?

The LF411ID is characterized for operation from –40°C to +85°C, qualifying it for use in industrial environments with wide ambient temperature swings. This extended range distinguishes it from the LF411CD (0°C to 70°C) and ensures reliable performance in outdoor equipment, motor controls, and factory automation systems where the LF411ID maintains specified input bias current and offset voltage behavior across the full span.

Does the LF411ID require external compensation?

No, the LF411ID features internal frequency compensation optimized for unity-gain stability, eliminating the need for external capacitors in standard inverting or non-inverting configurations. This simplifies PCB layout and reduces bill-of-materials count. The LF411ID achieves stable operation with capacitive loads up to 100 pF, though heavier loads may require isolation resistors - a design consideration explicitly documented in the LF411ID datasheet.

What is the purpose of Pins 1 and 8 (BAL1 and BAL2) on the LF411ID?

Pins 1 (BAL1) and 8 (BAL2) are offset null terminals used to connect an external 10-kΩ potentiometer for trimming input offset voltage. When the wiper is grounded and the ends tied to BAL1/BAL2, the LF411ID's V_IO can be adjusted to <0.5 mV - critical for DC-coupled precision applications like strain gauge amplifiers. These pins have no function if nulling is not required, and leaving them open does not affect normal operation of the LF411ID.

Is the LF411ID pin-compatible with other SOIC-8 op-amps?

The LF411ID follows the industry-standard SOIC-8 pinout for dual-supply op-amps (IN–, IN+, VCC–, NC, VCC+, OUT, BAL2, BAL1), matching pin assignments of LM358, TL072, and OPA234. However, functional compatibility depends on circuit requirements: the LF411ID's JFET input, 50 pA bias current, and 2.7 MHz bandwidth differ significantly from BJT-input devices. Always verify loop stability and noise performance before substituting the LF411ID in existing designs.

Why is the LF411ID marked as OBSOLETE in TI's packaging addendum?

TI classifies LF411ID as OBSOLETE per its 2014 Packaging Addendum, indicating discontinued production. However, Aetrix Electronics maintains verified legacy inventory with full traceability and extended lifecycle support. The LF411ID remains fully functional and specification-compliant - its obsolescence status reflects TI's portfolio rationalization, not performance degradation. Customers using the LF411ID in long-lifecycle industrial systems can rely on Aetrix for continued supply assurance and documentation support.