Analog Devices Inc. LT6375AHDF#PBF

Overview

LT6375AHDF#PBF from Analog Devices (formerly Linear Technology) is a precision unity-gain difference amplifier optimized for bidirectional current sensing and high-voltage level translation. It delivers ±270V input common mode range, 97dB minimum CMRR (A-grade), 0.0035% max gain error, 300µV max offset voltage, and rail-to-rail output - enabling accurate signal conditioning in industrial motor drives and battery management systems.

For engineers reviewing the LT6375AHDF#PBF datasheet, LT6375AHDF#PBF pinout, LT6375AHDF#PBF application, or LT6375AHDF#PBF equivalent, key selection criteria include guaranteed –40°C to 125°C operation, selectable resistor divider ratios (7/20/25), low 350µA supply current, and DFN14 package compatibility with high-density PCB layouts.

Technical Context

The LT6375AHDF#PBF integrates an Over-The-Top® protected precision op amp with a laser-trimmed thin-film resistor network to achieve exceptional DC accuracy and robustness against overvoltage transients. Its internal architecture supports three configurable resistor divider ratios (7, 20, 25) that directly determine input common mode range, bandwidth (310–575kHz), and noise performance (250–599nV/√Hz).

Operation relies on external reference pin configuration (+REFA/–REFA, +REFB/–REFB, +REFC/–REFC) to set the effective divider ratio and optimize trade-offs between common mode range, gain drift (±1ppm/°C), and nonlinearity (±2ppm). The SHDN pin enables 20µA shutdown current in DFN packages only.

Key Specifications

Pinout & Package

LT6375AHDF#PBF is housed in a 14-lead (4mm × 4mm) plastic DFN package with exposed pad (Pin 15) soldered to V– for thermal and electrical integrity. Pin numbering follows standard DFN top-view orientation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar difference amplifier applications.

Compared with INA240A1QDGSRQ1 and AD8479ARZ, the LT6375AHDF#PBF uniquely balances ultra-wide common mode range, user-selectable precision trade-offs via resistor dividers, and low-power shutdown - making it optimal for industrial and energy storage systems requiring both flexibility and guaranteed 125°C operation.

Availability

LT6375AHDF#PBF is available at Aetrix Electronics and suitable for industrial motor drives, battery management systems, and high-voltage data acquisition requiring stable component supply across extended temperature ranges.

Supply support for LT6375AHDF#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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and healthcare markets.

The LT6375 product line was developed by Linear Technology (acquired by ADI in 2017) to address precision current sensing and high-common-mode signal conditioning in harsh industrial environments - emphasizing DC accuracy, thermal stability, and robust input protection.

FAQ

What is the guaranteed operating temperature range for LT6375AHDF#PBF?

The LT6375AHDF#PBF is specified and tested over the full –40°C to +125°C junction temperature range. This grade ('H') ensures parametric performance compliance - including gain error, CMRR, and offset voltage - across that entire range, unlike the 'I' grade which is limited to 85°C. The DFN14 package's θJA of 43°C/W supports this rating with appropriate PCB copper area.

How does the resistor divider ratio affect LT6375AHDF#PBF performance?

The LT6375AHDF#PBF uses external reference pin connections to select one of three resistor divider ratios: 7, 20, or 25. A ratio of 7 gives 575kHz bandwidth and lowest noise (250nV/√Hz); ratio 25 enables ±270V common mode but reduces bandwidth to 310kHz and increases noise to 599nV/√Hz. Designers must choose the lowest ratio meeting their common mode requirement to maximize SNR and speed.

Does LT6375AHDF#PBF require external components for basic operation?

Yes - LT6375AHDF#PBF requires external connections to its reference pins (+REFA/–REFA, etc.) to configure the resistor divider ratio, and a reference voltage on the REF pin to set output zero-differential level. No external gain-setting resistors are needed since it is unity-gain fixed. A 0.1µF bypass capacitor on each supply pin is recommended per the datasheet for stability.

Can LT6375AHDF#PBF replace optocoupler-based isolation in current sensing?

Yes - LT6375AHDF#PBF is explicitly positioned as a replacement for isolation circuits in applications like high-side current sensing. Its ±270V common mode range, 97dB CMRR, and Over-The-Top® inputs eliminate the need for separate isolation amplifiers or optocouplers in many industrial and energy storage designs - reducing component count, latency, and long-term drift.

Is the SHDN pin functional on LT6375AHDF#PBF?

Yes - the SHDN pin (Pin 7) is fully functional on LT6375AHDF#PBF because it uses the DFN14 package. Pulling SHDN >2.5V below V+ places the LT6375AHDF#PBF in shutdown mode, reducing supply current to 20µA. This pin is not present on MSOP variants, confirming its DFN-specific implementation as stated in the Absolute Maximum Ratings table.