Analog Devices Inc. LT6108HMS8-1#TRPBF

Overview

LT6108HMS8-1#TRPBF from Analog Devices (formerly Linear Technology) is a high-side current sense amplifier with integrated 400mV precision reference and latching comparator, designed for overcurrent protection in industrial and automotive power systems. It delivers 125µV max input offset, 0.2% max gain error, 1MHz bandwidth, and operates from –40°C to 125°C in an 8-lead MSOP package. Used in motor control fault detection where fast latch response (<1.4µs propagation delay) prevents damage during transient overloads.

For engineers reviewing the LT6108HMS8-1#TRPBF datasheet, LT6108HMS8-1#TRPBF pinout, LT6108HMS8-1#TRPBF application, or LT6108HMS8-1#TRPBF equivalent, key selection criteria include latching comparator behavior, high-voltage common-mode range (up to 60V), low shutdown current (≤5µA), and Kelvin-sense compatibility for accurate shunt measurement under harsh thermal conditions.

Technical Context

The LT6108HMS8-1#TRPBF integrates a precision current sense amplifier with forced-feedback topology that drives SENSEHI to match SENSELO potential, enabling accurate high-side sensing without level-shifting circuitry. Its internal 400mV reference sets comparator threshold with ±1.25% total error and 10mV hysteresis.

It features dual-output architecture: OUTA provides current-mode output (I_OUTA = V_SENSE/R_IN) for programmable gain, while open-drain OUTC delivers latched overcurrent flag with reset via EN/RST pin - critical for safety-critical disconnect sequencing in battery management and industrial PLCs.

Key Specifications

Pinout & Package

LT6108HMS8-1#TRPBF is housed in an 8-lead plastic MSOP (MS8) package with θ_JA = 163°C/W. Exposed pad is not present in MSOP variant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-side current sense amplifier applications.

Compared with MAX4008AASA+ and INA240A1EDRGT, the LT6108HMS8-1#TRPBF uniquely combines latching comparator, integrated 400mV reference, and 60V operation in a single MSOP package - reducing component count and improving fault response determinism in safety-critical overcurrent protection.

Availability

LT6108HMS8-1#TRPBF is available at Aetrix Electronics and suitable for motor control protection, battery management systems, and industrial power supply overcurrent detection requiring stable component supply across extended temperature ranges.

Supply support for LT6108HMS8-1#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 acquired Linear Technology in 2017 and maintains its precision analog portfolio, including high-performance current sense solutions for demanding industrial and automotive applications.

The LT6108 product line was designed specifically for high-reliability overcurrent protection in high-voltage, high-temperature environments - emphasizing latch reliability, low offset drift, and robust common-mode rejection.

FAQ

What is the function of the EN/RST pin on the LT6108HMS8-1#TRPBF?

The EN/RST pin on the LT6108HMS8-1#TRPBF serves dual functions: pulling it high enables normal operation, while applying a 2–15µs low pulse resets the latched comparator output. Holding it low for >40µs places the LT6108HMS8-1#TRPBF into shutdown mode with ≤5µA current draw. This pin enables both active fault recovery and ultra-low-power standby states without external logic.

How does the LT6108HMS8-1#TRPBF achieve high-side current sensing without a level shifter?

The LT6108HMS8-1#TRPBF uses a forced-feedback architecture: its internal amplifier drives SENSEHI to match the potential at SENSELO, eliminating differential input voltage across the sense resistor. This allows direct Kelvin connection to high-side shunt terminals while referencing all outputs to V– (ground), removing need for isolated supplies or level-shifting circuitry in the LT6108HMS8-1#TRPBF signal chain.

What is the maximum sense voltage supported by the LT6108HMS8-1#TRPBF before accuracy degrades?

The LT6108HMS8-1#TRPBF specifies V_SENSE(MAX) = 500mV for full-scale accuracy. While the device tolerates higher differential inputs without damage, exceeding 500mV causes increasing gain error and output current deviation due to internal amplifier saturation effects. For reliable 0.2% gain error performance, V_SENSE must remain ≤500mV in the LT6108HMS8-1#TRPBF application.

Can the LT6108HMS8-1#TRPBF be used with a 1.8V logic supply for the comparator output?

Yes - the LT6108HMS8-1#TRPBF's open-drain OUTC output supports pull-up to any voltage from 1.8V to 60V. When pulled to 1.8V, VOL remains ≤220mV at 500µA sink current, ensuring clean logic-low recognition by 1.8V microcontrollers. This flexibility allows direct interfacing with low-voltage digital domains without level translators in the LT6108HMS8-1#TRPBF design.

Why does the LT6108HMS8-1#TRPBF specify different temperature grades (I vs H), and which applies to this part?

The "H" suffix in LT6108HMS8-1#TRPBF denotes the high-temperature grade, guaranteed for full electrical performance from –40°C to 125°C. This contrasts with the "I" grade (–40°C to 85°C). The H-grade qualification involves extended burn-in and parametric testing across the full range - making LT6108HMS8-1#TRPBF suitable for under-hood automotive, industrial motor drives, and other thermally demanding deployments.