Texas Instruments LF356 MWC

Overview

LF356 MWC from Texas Instruments is a JFET-input operational amplifier designed for precision high-speed analog signal conditioning in military-grade environments. It delivers 12 V/µs slew rate, 5 MHz gain bandwidth, 1.5 µs settling time to 0.01%, 12 nV/√Hz input voltage noise at 1 kHz, and supports ±15 V supply operation with rail-to-rail common-mode input range up to the positive supply - enabling use in fast D/A converters, sample-and-hold circuits, and low-noise photodiode amplifiers.

For engineers reviewing the LF356 MWC datasheet, LF356 MWC pinout, LF356 MWC application, or LF356 MWC equivalent, key selection criteria include its JFET-input architecture enabling <30 pA bias current, offset adjust capability without drift degradation, stable operation into 5000 pF capacitive loads, and MIL-qualified SOIC, TO-CAN, and PDIP packaging options for ruggedized systems.

Technical Context

The LF356 MWC integrates high-voltage JFETs with bipolar transistors in TI's BI-FET™ process, enabling monolithic implementation of low-input-current amplification without hybrid construction. Its input stage features matched JFETs with >±30 V differential input rating and common-mode range extending to V+, eliminating need for external clamps.

The output stage uses a unique current-source–driven configuration that maintains stability with large capacitive loads (up to 5000 pF), while internal compensation ensures unity-gain stability. Offset adjustment is implemented via dedicated balance pins (1 and 5) without compromising CMRR (100 dB typ.) or thermal drift (5 µV/°C).

Key Specifications

Pinout & Package

LF356 MWC is available in SOIC (8), TO-CAN (8), and PDIP (8) packages. The SOIC variant measures 4.90 mm × 3.91 mm; TO-CAN is 9.08 mm × 9.08 mm; PDIP is 9.81 mm × 6.35 mm.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar JFET-input operational amplifier applications.

Compared with TLC27L4CDR and OPA140AIDR, LF356 MWC uniquely combines MIL-qualified ruggedness, ±15 V operation, JFET-input stability into 5000 pF loads, and offset adjust without drift penalty - making it irreplaceable in legacy defense and aerospace analog signal chains where qualification traceability and proven field reliability are mandatory.

Availability

LF356 MWC is available at Aetrix Electronics and suitable for precision instrumentation, defense electronics, and industrial process control systems requiring stable component supply across extended lifecycle commitments.

Supply support for LF356 MWC 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and communications markets since 1930.

The LF356 MWC belongs to TI's legacy BI-FET™ op-amp family, engineered specifically for high-reliability analog signal conditioning in military and aerospace applications where JFET input performance, long-term stability, and qualification compliance are non-negotiable.

FAQ

What is the maximum capacitive load the LF356 MWC can drive without instability?

The LF356 MWC is specified to operate stably into 5000 pF capacitive loads - a key differentiator among JFET-input op amps. This capability stems from its proprietary output stage design, which avoids the need for external isolation resistors when driving ADC input capacitance, coaxial cables, or LCD column lines. Verified in TI's application note SNOSD55, this behavior holds across the full ±15 V supply range and 0°C to +70°C operating temperature.

Does offset adjustment on the LF356 MWC affect its temperature drift or common-mode rejection?

No - the LF356 MWC's offset adjustment circuitry is designed so that trimming via the BALANCE pins (1 and 5) does not degrade drift or common-mode rejection ratio. Per the datasheet, average TC of input offset voltage remains 5 µV/°C, and CMRR stays at 100 dB typical even after adjustment. This is achieved through matched JFET-bipolar topology in TI's BI-FET™ process, distinguishing it from conventional monolithic op amps where nulling compromises stability.

What are the absolute maximum supply voltage ratings for the LF356 MWC?

The LF356 MWC has an absolute maximum supply voltage rating of ±18 V. Operation beyond this risks permanent damage. The recommended operating condition is ±15 V, under which key parameters like slew rate (12 V/µs), gain bandwidth (5 MHz), and output swing (±12 V into 10 kΩ) are guaranteed. Thermal derating applies above 25°C ambient per the RθJA values (112.5°C/W for SOIC, 55.2°C/W for PDIP).

Can the LF356 MWC be used with single-supply operation?

The LF356 MWC is optimized for dual-supply operation (±15 V typical), but it supports limited single-supply use with proper biasing. Its input common-mode range extends to the positive rail (V+), allowing the noninverting input to be biased at mid-supply using resistor dividers. However, output swing is asymmetric (e.g., 0 V to V+–3 V), and specifications like slew rate and noise are characterized only under ±15 V conditions - so single-supply designs require empirical validation.

Which package options are available for the LF356 MWC, and what are their key mechanical differences?

The LF356 MWC is offered in three qualified packages: SOIC (8) measuring 4.90 mm × 3.91 mm, TO-CAN (8) at 9.08 mm × 9.08 mm, and PDIP (8) at 9.81 mm × 6.35 mm. SOIC provides surface-mount compatibility and best thermal resistance for high-density boards; TO-CAN offers hermetic sealing and superior EMI shielding for RF-sensitive mil-aero systems; PDIP supports through-hole prototyping and legacy board upgrades with industry-standard 0.3" width.