Analog Devices Inc. LT6119HMS-1#TRPBF

Overview

LT6119HMS-1#TRPBF from Analog Devices (formerly Linear Technology) is a high-side current sense amplifier with integrated 400mV precision reference and dual latching comparators configured in opposing polarity (LT6119-1 variant). It delivers 200µV max input offset, 0.2% max gain error, and 1.4µs total propagation delay for fast overcurrent/undercurrent fault detection in industrial motor control and automotive battery monitoring systems.

For engineers reviewing the LT6119HMS-1#TRPBF datasheet, LT6119HMS-1#TRPBF pinout, LT6119HMS-1#TRPBF application, or LT6119HMS-1#TRPBF equivalent, key selection criteria include its –40°C to 125°C operating range, 2.7V–60V supply capability, MSOP-10 package compatibility, and comparator latch enable/disable functionality via the LE pin.

Technical Context

The LT6119HMS-1#TRPBF implements a precision current-sense amplifier using a feedback loop that forces SENSEHI to match SENSELO potential, generating an output current I_OUTA = V_SENSE/R_IN. Its two comparators share a common 400mV internal reference but operate with opposite polarity - one triggers on rising input (overcurrent), the other on falling input (undercurrent).

Comparator outputs are open-drain (OUTC1/OUTC2), rated for up to 60V above V–, enabling direct interface with higher-voltage logic or external pull-ups. The LE pin controls latch mode: high enables latching (output remains low after trip), low enables transparent operation. Power-on reset ensures known initial state.

Key Specifications

Pinout & Package

LT6119HMS-1#TRPBF is housed in a 10-lead MSOP package (θ_JA = 160°C/W), optimized for space-constrained high-voltage PCB layouts with exposed pad thermal performance.

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 INA301AIDR, the LT6119HMS-1#TRPBF uniquely integrates opposing-polarity latching comparators and a precision 400mV reference in a single MSOP-10 package, enabling compact, self-contained bidirectional fault detection without external support components.

Availability

LT6119HMS-1#TRPBF is available at Aetrix Electronics and suitable for industrial motor control, automotive battery management, and 48V mild hybrid systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LT6119HMS-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, 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 LT6119 product line was designed by Linear Technology (acquired by ADI in 2017) specifically for high-reliability, high-voltage current sensing in safety-critical systems where speed, accuracy, and temperature robustness are non-negotiable.

FAQ

What is the key functional difference between LT6119HMS-1#TRPBF and LT6119HMS-2#TRPBF?

The LT6119HMS-1#TRPBF implements opposing-polarity comparators - one triggers on rising input (overcurrent), the other on falling input (undercurrent). In contrast, the LT6119HMS-2#TRPBF uses same-polarity comparators, both triggering on rising input for dual overcurrent thresholds. This makes LT6119HMS-1#TRPBF ideal for bidirectional fault detection in motor control, while LT6119HMS-2#TRPBF suits redundant overcurrent monitoring. Both share identical amplifier specs, reference, and package.

Can LT6119HMS-1#TRPBF operate with a 3.3V supply rail while sensing on a 48V bus?

Yes. The LT6119HMS-1#TRPBF supports supply voltages from 2.7V to 60V, and its SENSEHI/SENSELO inputs tolerate common-mode voltages up to 33V above either supply rail. When powered from 3.3V, it can accurately sense differential voltages across a shunt placed on a 48V bus - provided the voltage difference between V+ and SENSEHI/SENSELO stays within absolute maximum ratings (≤33V). The comparator outputs remain 60V-rated regardless of V+.

How does the LE pin affect comparator behavior in LT6119HMS-1#TRPBF?

When LE is high, the comparators latch: once tripped, OUTC1 or OUTC2 remains low until LE is pulsed low (minimum 2µs pulse width) to reset both latches. When LE is low, the comparators operate transparently - outputs follow input conditions in real time. Power-on reset automatically initializes both comparators to high-output state at startup, ensuring predictable behavior before firmware intervention.

What is the maximum recommended value for RIN in LT6119HMS-1#TRPBF, and why?

The maximum recommended RIN is 1kΩ. Larger values degrade loop stability and increase susceptibility to noise and PCB trace resistance errors. At RIN = 1kΩ and V_SENSE = 100mV, I_OUTA = 100µA - sufficient for most applications. Lower RIN values (e.g., 100Ω) improve bandwidth and reduce settling time but increase power dissipation in the IC. Designers must balance speed, accuracy, and thermal constraints per application requirements.

Does LT6119HMS-1#TRPBF require external filtering for stable operation?

No external filtering is required for basic operation, but proper layout is critical. The LT6119HMS-1#TRPBF includes internal compensation for stability with typical RIN/ROUT configurations. However, high-frequency noise on the sense lines can cause false comparator trips; a 100nF capacitor across R_SENSE or RC filter on INC1/INC2 inputs is recommended for noisy environments. Output filtering (e.g., 100pF + 10Ω) may be added to OUTA if driving long traces into high-capacitance ADC inputs.