Analog Devices Inc. LT6375IDF#PBF

Overview

LT6375IDF#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 (LT6375A grade), 0.0035% max gain error, 1ppm/°C gain drift, and rail-to-rail output swing - enabling accurate signal conditioning in industrial motor drives and battery management systems.

For engineers reviewing the LT6375IDF#PBF datasheet, LT6375IDF#PBF pinout, LT6375IDF#PBF application, or LT6375IDF#PBF equivalent, key selection criteria include selectable resistor divider ratios (7/20/25), shutdown capability (20µA), DFN-14 package thermal performance (θJA = 43°C/W), and guaranteed operation from –40°C to 85°C.

Technical Context

The LT6375IDF#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, noise density (250–599 nV/√Hz), and bandwidth (310–575 kHz).

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 error drift (±1 ppm/°C), and settling time (as low as 8 µs at 0.1%). The SHDN pin enables low-power mode only in DFN packages.

Key Specifications

Pinout & Package

LT6375IDF#PBF is housed in a 14-lead (4mm × 4mm) plastic DFN package with exposed thermal pad (Pin 15 = V–). The package supports reflow soldering and requires PCB soldering of the exposed pad for thermal compliance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A1QDRQ1 and AD8479ARZ, LT6375IDF#PBF uniquely balances ±270V operation, selectable gain configuration, 20µA shutdown, and DFN thermal performance - making it optimal for space-constrained industrial power electronics where precision, flexibility, and power efficiency are jointly critical.

Availability

LT6375IDF#PBF is available at Aetrix Electronics and suitable for industrial motor drives, battery management systems, and high-voltage data acquisition requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for LT6375IDF#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 LT6375IDF#PBF belongs to ADI's precision signal conditioning portfolio, designed specifically for high-common-mode, low-error current sensing and level translation in harsh industrial environments.

FAQ

What is the maximum common mode voltage supported by the LT6375IDF#PBF?

The LT6375IDF#PBF supports a maximum input common mode voltage of ±270V when configured with resistor divider ratio = 25 (all REF pins connected appropriately). This rating is guaranteed under VS = ±15V supply conditions and applies to both +IN and –IN pins independently, enabling direct connection to high-voltage shunts without external protection circuitry.

How does the resistor divider ratio affect bandwidth and noise in the LT6375IDF#PBF?

In the LT6375IDF#PBF, increasing the resistor divider ratio reduces bandwidth and increases output-referred noise: at ratio = 7, bandwidth is 575kHz and noise is 250nV/√Hz; at ratio = 20, bandwidth drops to 375kHz and noise rises to 508nV/√Hz; at ratio = 25, bandwidth is 310kHz and noise reaches 599nV/√Hz. Select the lowest ratio that meets your common mode requirement to maximize speed and SNR.

Is the LT6375IDF#PBF pin-compatible with other variants in the LT6375 family?

Yes, the LT6375IDF#PBF shares identical pinout and footprint with all DFN-14 variants including LT6375HDF#PBF and LT6375AHDF#PBF. Differences lie solely in temperature grade (–40°C to 85°C for 'I', up to 125°C for 'H'/'AH') and guaranteed performance limits (e.g., LT6375A grade specifies tighter gain error and CMRR).

Does the LT6375IDF#PBF require external passive components for basic operation?

No, the LT6375IDF#PBF integrates all precision resistors internally and requires no external gain-setting components. Only the REF pin needs connection (to ground, V+, or mid-supply) to set output zero-differential level; reference pins (+REFA/–REFA etc.) are configured per desired divider ratio, and SHDN is pulled high or left floating for normal operation.

What thermal considerations apply to the LT6375IDF#PBF in continuous operation?

The LT6375IDF#PBF uses a DFN-14 package with exposed V– pad (Pin 15) that must be soldered to a PCB copper pour for thermal conduction. With θJA = 43°C/W, junction temperature rise is ~15°C at 350µA supply current and 25°C ambient. For high-output-current or high-ambient scenarios, ensure ≥200mm² of 2-oz copper connected to the exposed pad to maintain TJ < 125°C.