Analog Devices Inc. LT1792CS8#PBF

Overview

LT1792CS8#PBF from Analog Devices (formerly Linear Technology) is a low-noise, precision JFET-input operational amplifier optimized for high-impedance capacitive transducer signal conditioning. It delivers 4.2 nV/√Hz input voltage noise density at 1 kHz, 600 µV max input offset voltage, and 5.6 MHz gain-bandwidth product under ±15 V supplies - enabling high-fidelity amplification in hydrophone, piezoelectric accelerometer, and photodiode front ends.

For engineers reviewing the LT1792CS8#PBF datasheet, LT1792CS8#PBF pinout, LT1792CS8#PBF application, or LT1792CS8#PBF equivalent, this page provides verified specifications, SO-8 package terminal mapping, real-world noise performance data, and validated alternative options for low-noise instrumentation amplifier design.

Technical Context

The LT1792CS8#PBF employs a large-geometry JFET input stage to achieve ultra-low voltage noise while maintaining picoampere-level bias currents (≤800 pA warmed up). Its architecture eliminates phase reversal across the full common-mode range and supports unconditional stability at unity gain with up to 1000 pF capacitive load.

It is fully specified for ±5 V to ±20 V dual supplies, with guaranteed performance over –40°C to 85°C (Industrial grade), and includes 100% production testing for voltage noise, slew rate (≥2.3 V/µs), and open-loop gain (>4 million V/V).

Key Specifications

Pinout & Package

LT1792CS8#PBF is housed in an 8-lead plastic SO (SO-8, narrow 0.150") package with standard industry pinout and 1.27 mm lead pitch. Thermal resistance θ_JA = 190°C/W enables operation up to +85°C ambient with appropriate PCB copper area.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LT1793CS8#PBF and OPA140AIDR, the LT1792CS8#PBF uniquely balances ultra-low voltage noise, pA-level bias current, and robust capacitive-load stability - making it optimal for high-Z AC-coupled transducer amplifiers where both noise and phase margin are critical.

Availability

LT1792CS8#PBF is available at Aetrix Electronics and suitable for hydrophone amplifiers, piezoelectric sensor interfaces, and precision photodiode front ends requiring stable component supply across industrial temperature ranges and long production lifecycles.

Supply support for LT1792CS8#PBF 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

Analog Devices acquired Linear Technology in 2017 and continues its legacy of high-performance analog ICs, with emphasis on precision signal conditioning, power management, and data conversion.

The LT1792CS8#PBF belongs to Linear's precision JFET op amp family, designed specifically for low-noise, high-input-impedance sensor signal chains in test & measurement, geophysical, and aerospace instrumentation.

FAQ

What is the maximum capacitive load the LT1792CS8#PBF can drive stably at unity gain?

The LT1792CS8#PBF is unconditionally stable at unity gain with capacitive loads up to 1000 pF, as confirmed by manufacturer characterization (Figure 1792 G13). This eliminates the need for series isolation resistors in applications such as coaxial cable driving or piezoelectric sensor buffering, unlike many competing JFET op amps limited to <100 pF without compensation.

Does the LT1792CS8#PBF support ±5 V operation, and how does it affect key parameters?

Yes, the LT1792CS8#PBF is fully specified for ±5 V supplies. At ±5 V, supply current drops slightly (5.15 mA typ), input offset voltage increases modestly (≤1.0 mV max), and gain-bandwidth reduces to 4.5 MHz typ. Die temperature decreases by ~20°C versus ±15 V operation - lowering bias current drift and improving long-term stability in thermally constrained designs.

Can the LT1792CS8#PBF replace OPA124 or AD745 in existing sockets?

Yes - the LT1792CS8#PBF uses the same SO-8 pinout as OPA124, AD743, AD745, AD645, AD544, and AD820. Offset nulling is compatible when the potentiometer wiper connects to V– (Figure 1a), and no PCB changes are required. However, the LT1792CS8#PBF delivers 4.2 nV/√Hz noise versus 5.5–7 nV/√Hz for those predecessors, offering measurable SNR improvement.

What is the input voltage noise distribution for the LT1792CS8#PBF, and how is it verified?

Data sheet Figure 1792 TA02 shows a measured 270-unit histogram with peak density at 4.2 nV/√Hz and 95% of units ≤6.0 nV/√Hz at 1 kHz. The LT1792CS8#PBF undergoes 100% production testing for voltage noise, ensuring every shipped unit meets the 6 nV/√Hz maximum specification - a guarantee not offered by most competing JFET op amps.

How does the LT1792CS8#PBF handle input common-mode overvoltage conditions?

The LT1792CS8#PBF eliminates phase reversal across its full input common-mode range (±13.5 V on ±15 V supplies). As demonstrated in Figure 1792 F04a, it cleanly clips and recovers when inputs exceed rails by ±0.2 V - preventing latch-up in servo loops and distortion in follower configurations. This behavior is intrinsic to its input stage design, not dependent on external protection circuitry.