Analog Devices Inc. LT6108IMS8-1#TRPBF

Overview

LT6108IMS8-1#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 rails. It features 125µV max input offset, 0.2% max gain error, 1MHz bandwidth, and operates from 2.7V to 60V supply across –40°C to 85°C. Used in motor control fault detection where fast latch response (<1.4µs propagation delay) isolates loads during transient overcurrent events.

For engineers reviewing the LT6108IMS8-1#TRPBF datasheet, LT6108IMS8-1#TRPBF pinout, LT6108IMS8-1#TRPBF application, or LT6108IMS8-1#TRPBF equivalent, key selection criteria include latching comparator behavior, MSOP-8 package thermal performance (θJA = 163°C/W), 500ns amplifier step response, and direct SENSEHI/SENSELO Kelvin interface capability for shunt-based current monitoring.

Technical Context

The LT6108IMS8-1#TRPBF implements a high-impedance current-sense amplifier that forces SENSEHI to match SENSELO potential via internal feedback, enabling accurate VSENSE measurement across external shunts. Its latching comparator uses an internal 400mV reference with ±1.25% total threshold error and 3–15mV hysteresis to capture single-event overcurrents without continuous polling.

Amplifier output is a proportional current (IOUTA = VSENSE/RIN) delivered at OUTA, while comparator output (OUTC) is open-drain with 60V absolute max rating and 60–220mV low-level voltage at 500µA sink. EN/RST pin enables shutdown (5µA max) and provides reset pulse control (2–15µs width) for latch recovery.

Key Specifications

Pinout & Package

LT6108IMS8-1#TRPBF is housed in an 8-lead plastic MSOP package (3mm × 3mm, 0.65mm pitch) with θJA = 163°C/W and exposed pad not present (MS8 variant). Pin functions are validated per Linear Technology datasheet 610812fa.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX40056ATA+T and INA301A1IDR, the LT6108IMS8-1#TRPBF uniquely combines user-configurable gain, latching comparator, 60V operation, and Kelvin-input architecture-making it the only option supporting autonomous, high-voltage, precision overcurrent protection without supplemental ICs.

Availability

LT6108IMS8-1#TRPBF is available at Aetrix Electronics and suitable for industrial motor control, automotive BCM modules, and 48V server power supply overcurrent protection requiring stable component supply and long-term production continuity.

Supply support for LT6108IMS8-1#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 full product support, documentation, and manufacturing continuity for the LT6108 family.

The LT6108 product line was engineered for high-reliability, high-voltage current sensing in safety-critical power systems-emphasizing latch-based fault capture, wide common-mode range, and minimal external component count.

FAQ

What is the function of the EN/RST pin on the LT6108IMS8-1#TRPBF?

The EN/RST pin on the LT6108IMS8-1#TRPBF serves dual functions: pulling it high enables normal operation, while applying a low pulse of 2–15µs resets the latched comparator output. Holding it low for >40µs places the LT6108IMS8-1#TRPBF into shutdown mode with ≤5µA supply current. This pin eliminates need for external reset circuitry in autonomous protection systems.

Can the LT6108IMS8-1#TRPBF be used with a 60V bus voltage?

Yes, the LT6108IMS8-1#TRPBF supports total supply voltage (V+ to V–) up to 60V and withstands up to 60V on OUTC and SENSEHI/SENSELO pins relative to V–. Its specified common-mode range extends to 60V, making it suitable for direct connection to 48V and 60V industrial and automotive power rails without external level-shifting components.

How does the LT6108IMS8-1#TRPBF achieve high accuracy despite wide supply voltage range?

The LT6108IMS8-1#TRPBF achieves high accuracy through a combination of 125µV max input offset voltage, ±0.2% max gain error, and 120dB min PSRR-ensuring stable performance across 2.7V–60V supply variations. Its internal 400mV reference exhibits ±1.25% total threshold error over temperature, and CMRR remains ≥110dB even at 60V common-mode voltage.

What is the purpose of the OUTA pin on the LT6108IMS8-1#TRPBF?

The OUTA pin on the LT6108IMS8-1#TRPBF delivers a current output (IOUTA = VSENSE/RIN) proportional to the sensed shunt voltage. This current can be converted to a voltage using an external resistor (ROUT) tied to V–, enabling flexible gain configuration and direct interfacing with ADCs, comparators, or analog controllers-unlike fixed-output voltage sense amplifiers.

Is the LT6108IMS8-1#TRPBF RoHS-compliant and lead-free?

Yes, the LT6108IMS8-1#TRPBF carries the #TRPBF suffix indicating tape-and-reel packaging with 100% matte tin (Sn) lead-free finish, compliant with RoHS Directive 2011/65/EU and JEDEC J-STD-609. The part marking "LTFND" on the MSOP-8 body confirms lead-free qualification per Analog Devices' standard marking scheme.