Texas Instruments LF347N/NOPB

Overview

LF347N/NOPB from Texas Instruments is a quad JFET-input operational amplifier optimized for high-speed, low-input-bias-current applications including precision integrators, sample-and-hold circuits, and D/A converter buffers. It delivers 4 MHz gain-bandwidth, 13 V/μs slew rate, 5 mV max input offset voltage, and 50 pA typical input bias current across the 0°C to 70°C commercial temperature range.

For engineers reviewing the LF347N/NOPB datasheet, LF347N/NOPB pinout, LF347N/NOPB application, or LF347N/NOPB equivalent, key selection criteria include JFET-input impedance (10¹² Ω), low 1/f noise corner (50 Hz), fast 2 μs settling to 0.01%, and compatibility with ±15 V supplies in PDIP-14 packaging.

Technical Context

The LF347N/NOPB implements BI-FET II™ technology with internally trimmed input offset voltage and matched high-voltage JFET input stages. Its architecture enables ultra-low input bias current (50 pA typ) while maintaining wide bandwidth (4 MHz) and high slew rate (13 V/μs) under ±15 V supply conditions.

It operates over 0°C to 70°C with ±15 V supply rating, 10¹² Ω input resistance, and supports rail-to-rail output swing of ±12 V into 10 kΩ. The device features low total harmonic distortion (≤0.02%) and 80 dB minimum CMRR, making it suitable for precision analog signal conditioning where input loading and DC accuracy are critical.

Key Specifications

Pinout & Package

LF347N/NOPB is housed in a 14-pin plastic dual in-line package (PDIP-N), 0.300-inch width, with standard JEDEC MO-001AC outline and through-hole mounting. Thermal resistance θ_JA is 75°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TL084CDR and LF347M/NOPB, the LF347N/NOPB uniquely combines PDIP-14 mechanical robustness, 50 pA input bias current, and 50 Hz 1/f noise corner-making it optimal for legacy through-hole designs requiring lowest possible input current and low-frequency stability.

Availability

LF347N/NOPB is available at Aetrix Electronics and suitable for precision analog signal conditioning, high-impedance sensor interfacing, and industrial instrumentation requiring stable component supply and long-term obsolescence support.

Supply support for LF347N/NOPB 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 specializing in analog and embedded processing technologies, with decades of heritage in precision op-amp design and manufacturing excellence.

The LF347N/NOPB belongs to TI's legacy BI-FET II™ op-amp family, engineered specifically for applications demanding JFET-input performance-low bias current, high input impedance, and low 1/f noise-in cost-sensitive industrial and test equipment.

FAQ

What is the maximum supply voltage for LF347N/NOPB?

The LF347N/NOPB is rated for ±15 V supply voltage per the Absolute Maximum Ratings table. Exceeding ±15 V risks permanent damage, as its absolute maximum supply voltage is ±18 V-but operation above ±15 V is not characterized or guaranteed. Always operate within ±15 V for full specification compliance and reliability across the 0°C to 70°C temperature range. The LF347N/NOPB datasheet explicitly defines all AC/DC parameters at ±15 V.

Does LF347N/NOPB require external offset nulling?

No, the LF347N/NOPB does not require external offset nulling because it features internal trimming of input offset voltage to ≤5 mV maximum at 25°C. This eliminates the need for potentiometers or external compensation networks in most precision applications. The internal trim is process-stable and maintains low drift over temperature-ΔVOS/ΔT is only 10 μV/°C-so system-level calibration remains simplified. The LF347N/NOPB achieves this via TI's BI-FET II™ fabrication process.

Can LF347N/NOPB drive a 2 kΩ load to ±10 V?

Yes, the LF347N/NOPB is specified to drive a 2 kΩ load to ±10 V over the full 0°C to 70°C operating temperature range, as confirmed in the DC Electrical Characteristics table under VO (Output Voltage Swing). However, heavier loads may cause increased input offset voltage on negative swings and eventual current limiting. For sustained ±10 V into 2 kΩ, ensure adequate supply decoupling and thermal management-the PDIP package has θ_JA = 75°C/W-and verify output stage behavior in your specific circuit configuration using the LF347N/NOPB SPICE model.

Is LF347N/NOPB pin-compatible with LM148?

No, the LF347N/NOPB is not pin-compatible with the LM148. While the LF147 (military-grade variant) is explicitly stated as pin-compatible with LM148, the LF347 series-including LF347N/NOPB-is a commercial-grade derivative with identical pinout *only within its own family* (e.g., LF347M/NOPB, LF347BN/NOPB). The LM148 uses a different internal architecture and biasing scheme; substituting LF347N/NOPB into an LM148 layout may result in incorrect operation due to differences in input stage behavior and supply current requirements.

What is the input common-mode voltage range for LF347N/NOPB?

The input common-mode voltage range for LF347N/NOPB is ±11 V with ±15 V supplies, as specified in the DC Electrical Characteristics table under VCM. This means both inputs can swing from −11 V to +11 V relative to ground while maintaining linear operation. Exceeding the negative limit (−11 V) forces the output high; exceeding the positive limit (+11 V) on both inputs also forces high output. The LF347N/NOPB does not support rail-to-rail input-inputs must remain ≥−12 V and ≤+15 V to avoid phase reversal or saturation.