onsemi LF351N

Overview

LF351N from STMicroelectronics is a wide-bandwidth JFET-input operational amplifier in an 8-pin DIP package, featuring 16 V/µs slew rate, ±15 V input voltage range, and 2.5–4 MHz gain-bandwidth product. It delivers high input impedance (10¹² Ω), low input bias current (20–200 pA), and internal frequency compensation for stable unity-gain operation in precision analog signal conditioning circuits.

For engineers reviewing the LF351N datasheet, LF351N pinout, LF351N application, or LF351N equivalent, key selection criteria include input offset voltage drift (10 µV/°C), output short-circuit protection, common-mode range extending to VCC+, and compatibility with ±15 V dual supplies in industrial sensor interfaces and active filter designs.

Technical Context

The LF351N integrates matched high-voltage JFET and bipolar transistors on a monolithic die to achieve low input bias current and high slew rate. Its JFET input stage enables >10¹² Ω input resistance and sub-100 pA bias current at +25°C, while internal frequency compensation ensures unconditional stability without external components.

It operates over 0°C to +70°C ambient temperature with ±6 V to ±18 V supply capability, supports rail-to-rail common-mode input (±11 V to +15 V), and maintains 70–86 dB CMRR and PSRR across temperature - critical for DC-coupled instrumentation amplifiers and low-noise transducer signal chains.

Key Specifications

Pinout & Package

DIP8 plastic through-hole package (JEDEC MS-001), 9.27 mm × 6.35 mm body, 2.54 mm lead pitch, 3.30 mm height. RoHS-compliant ECOPACK® with lead-free second-level interconnect.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLC271CP and TL071CP, the LF351N offers superior common-mode input range (up to VCC+) and infinite short-circuit duration - making it more robust in industrial sensor interfaces where input overvoltage or output fault conditions are likely.

Availability

LF351N is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, active filter design, function generator waveform shaping, and DC power supply error amplification requiring stable component supply across long-lifecycle embedded systems.

Supply support for LF351N 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power ICs, analog components, and MEMS sensors for industrial, automotive, and consumer markets.

The LF351N belongs to ST's legacy JFET-input op-amp family, engineered for high-precision, low-drift analog signal processing in cost-sensitive industrial instrumentation and test equipment.

FAQ

Can LF351N operate from a single +12 V supply?

Yes - the LF351N supports single-supply operation with input common-mode range extending to VCC+ (i.e., +12 V). However, output swing is limited to approximately +10 V and ground, so AC-coupled or level-shifted inputs are recommended for full-range signal handling.

What is the purpose of pins 1 and 5 on LF351N?

Pins 1 and 5 are offset null terminals. Connecting a 10 kΩ potentiometer between them - with wiper to VCC− - allows manual trimming of input offset voltage to under 1 mV, critical for DC-coupled precision amplifiers where initial offset affects accuracy.

Is LF351N pin-compatible with LM741?

No - LF351N uses an 8-pin DIP layout with dedicated offset-null pins (1 and 5) and NC pin (8), whereas LM741 uses pins 1 and 5 for offset null but lacks a no-connect pin. Direct replacement requires PCB layout revision and verification of input/output voltage ranges.

Does LF351N require external compensation capacitors?

No - the LF351N features internal frequency compensation optimized for unity-gain stability. External compensation is unnecessary in standard inverting/non-inverting configurations, though may be added for specialized high-speed or high-gain applications requiring adjusted phase margin.