Analog Devices Inc. LT1990IS8#TRPBF

Overview

LT1990IS8#TRPBF from Analog Devices (formerly Linear Technology) is a micropower precision difference amplifier optimized for high common-mode voltage sensing in battery monitoring, current sensing, and industrial signal acquisition. It delivers pin-selectable gain of 1 or 10, ±250V input common-mode range (at ±15V supply), 70dB min CMRR, and rail-to-rail output swing - enabling accurate low-side and high-side voltage/current measurement in noisy, high-voltage systems such as EV battery packs and telecom power supplies.

For engineers reviewing the LT1990IS8#TRPBF datasheet, LT1990IS8#TRPBF pinout, LT1990IS8#TRPBF application, or LT1990IS8#TRPBF equivalent, this device is critical for designs requiring fault-protected front ends, wide supply operation (2.7V–36V), micropower consumption (<120µA), and precise differential amplification under extreme common-mode transients up to ±350V.

Technical Context

The LT1990IS8#TRPBF implements an integrated thin-film resistor-based modified difference amplifier with internal 27:1 common-mode voltage division, enabling ±250V input range while operating from ±15V supplies. Its architecture includes dedicated GAIN1/GAIN2 pins for hardware-selectable gain and a REF pin for output offset control.

It features matched 1MΩ input resistors on +IN and –IN pins, high input impedance (2MΩ differential, 500kΩ common mode), and built-in fault protection against ±350V common-mode and ±500V differential transients - eliminating need for external clamping in most high-voltage monitoring applications.

Key Specifications

Pinout & Package

LT1990IS8#TRPBF is housed in an 8-pin SOIC (SO-8) package with standard JEDEC MS-012AC footprint and 1.27mm pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A1IDR and AD8479ARZ, the LT1990IS8#TRPBF uniquely balances ±250V common-mode capability, micropower operation (<120µA), pin-selectable gain, and rail-to-rail output - making it optimal for space- and energy-constrained high-voltage monitoring where flexibility and robustness are prioritized.

Availability

LT1990IS8#TRPBF is available at Aetrix Electronics and suitable for battery management systems, industrial current monitors, telecom power supplies, and automotive diagnostic modules requiring stable component supply and guaranteed industrial temperature performance (–40°C to 85°C).

Supply support for LT1990IS8#TRPBF 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 LT1990 product line was developed by Linear Technology (acquired by ADI in 2017) specifically for precision high-common-mode-voltage signal conditioning - targeting applications where discrete solutions fail due to mismatch, drift, or transient vulnerability.

FAQ

What is the maximum common-mode voltage the LT1990IS8#TRPBF can handle?

The LT1990IS8#TRPBF supports a guaranteed ±250V input common-mode voltage range when operated from ±15V supplies. Under transient conditions, it withstands up to ±350V common-mode and ±500V differential voltages without damage - confirmed per its Absolute Maximum Ratings table and functional specifications in the official datasheet.

Does the LT1990IS8#TRPBF require external resistors to set gain?

No, the LT1990IS8#TRPBF does not require external resistors to set gain. It provides pin-selectable gain of 1 or 10 via internal thin-film resistor networks: leaving GAIN1 and GAIN2 pins open selects G=1; connecting both to the REF pin selects G=10 - eliminating external gain-setting components and associated matching errors.

What supply voltage ranges are supported by the LT1990IS8#TRPBF?

The LT1990IS8#TRPBF operates from a total supply voltage of 2.7V to 36V. This includes single-supply configurations (e.g., 3V, 5V, 12V, 24V with V– = GND) and split-supply configurations (e.g., ±5V, ±15V). Minimum supply voltage is guaranteed by PSRR down to ±1.35V (split) or 2.7V (single), per datasheet electrical characteristics.

How does the LT1990IS8#TRPBF achieve high common-mode rejection?

The LT1990IS8#TRPBF achieves ≥70dB CMRR through precision-matched on-chip thin-film resistors and internal 27:1 common-mode voltage division. To maintain this performance, external source impedances on +IN and –IN must be matched within tens of ohms; mismatch beyond that introduces additional CM error - a design requirement explicitly documented in the Applications Information section.

Is the LT1990IS8#TRPBF RoHS-compliant and lead-free?

Yes, the LT1990IS8#TRPBF is RoHS-compliant and lead-free. The "#PBF" suffix denotes lead-free packaging, and "#TRPBF" indicates lead-free tape-and-reel packaging. Full compliance documentation, including material declarations and test reports, is available through Analog Devices' official product page and authorized distributor portals.