Texas Instruments LMP8640HVMK-T/NOPB

Overview

LMP8640HVMK-T/NOPB from Texas Instruments is a precision high-voltage current sense amplifier with fixed 100 V/V gain, -2 V to +76 V common-mode input range, 0.25% max gain error, 900 µV input offset voltage, and 6-pin SOT-23 package. It enables accurate high-side current monitoring in industrial power supplies and battery management systems where wide common-mode voltage and temperature-stable gain are critical.

For engineers reviewing the LMP8640HVMK-T/NOPB datasheet, LMP8640HVMK-T/NOPB pinout, LMP8640HVMK-T/NOPB application, or LMP8640HVMK-T/NOPB equivalent, this page delivers verified specifications, functional context, real-world use cases, and validated alternative options for high-voltage current sensing designs requiring ±0.25% gain accuracy and operation up to 125°C.

Technical Context

The LMP8640HVMK-T/NOPB implements a precision instrumentation amplifier topology optimized for high common-mode rejection across its full -2 V to +76 V input range. Its fixed-gain architecture eliminates external resistor matching errors and ensures stable 100 V/V transfer function over temperature.

It features internal 5 kΩ differential input impedance, buffered rail-to-rail output stage, and operates from 2.7 V to 12 V supply. CMRR reaches 95 dB at 76 V common-mode voltage and PSRR is 85 dB, enabling reliable sensing in noisy DC bus environments.

Key Specifications

Pinout & Package

Package: 6-pin Thin SOT-23 (2.9 mm × 1.6 mm), surface-mount, lead-free (RoHS-compliant).

Key Features

Applications

Equivalent & Alternatives

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

Compared with LMP8640HVMK-T/NOPB, INA240A1QDGKRQ1 offers automotive qualification and wider negative CMV but trades 230 kHz bandwidth for 120 kHz and requires recalibration due to 50 V/V gain. MAX40056ATA+T matches the 100 V/V gain and exceeds bandwidth but restricts supply to ≤5.5 V and reduces CMV upper limit to +65 V.

Availability

LMP8640HVMK-T/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, battery management systems, and telecom rectifier monitoring requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for LMP8640HVMK-T/NOPB 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

Texas Instruments is a global semiconductor company specializing in analog and embedded processing technologies, with leadership in precision amplifiers, power management, and signal chain solutions.

The LMP8640 family is designed for high-accuracy, high-common-mode current sensing in industrial, telecom, and energy storage applications-emphasizing gain stability, wide voltage range, and robust thermal performance.

FAQ

What is the maximum common-mode input voltage supported by the LMP8640HVMK-T/NOPB?

The LMP8640HVMK-T/NOPB supports a maximum common-mode input voltage of +76 V and a minimum of −2 V. This −2 V to +76 V range allows direct connection to high-voltage DC rails such as 48 V, 60 V, and 72 V battery systems without external attenuation or level-shifting circuitry. The specification is validated per TI's SNOSB28G datasheet Section 7.1 Absolute Maximum Ratings.

Does the LMP8640HVMK-T/NOPB require external gain-setting resistors?

No, the LMP8640HVMK-T/NOPB does not require external gain-setting resistors. It features a factory-trimmed fixed gain of 100 V/V, implemented using internal laser-trimmed thin-film resistors. This eliminates resistor matching errors, thermal drift, and layout sensitivity-ensuring ±0.25% max gain error over temperature. The LMP8640HVMK-T/NOPB is part of the HV variant family explicitly designated for 100 V/V operation.

What is the supply voltage range for the LMP8640HVMK-T/NOPB?

The LMP8640HVMK-T/NOPB operates from a single supply voltage of 2.7 V to 12 V, referenced between V+ and V− pins. This range supports direct interfacing with 3.3 V and 5 V microcontrollers as well as higher-voltage industrial logic. Operation outside this range risks damage or undefined behavior, as specified in Section 7.4 Recommended Operating Conditions of the SNOSB28G datasheet.

Can the LMP8640HVMK-T/NOPB be used in automotive applications?

The LMP8640HVMK-T/NOPB is not AEC-Q100 qualified and is intended for industrial and telecom applications. For automotive use, Texas Instruments offers the pin-compatible LMP8640-Q1 series (e.g., LMP8640HVMK-Q1), which meets AEC-Q100 Grade 1 requirements (−40°C to +125°C) and includes enhanced ESD and reliability testing. The LMP8640HVMK-T/NOPB lacks automotive qualification documentation and stress test validation.

What is the typical input bias current of the LMP8640HVMK-T/NOPB at 25°C?

The typical input bias current of the LMP8640HVMK-T/NOPB is 13 µA at 25°C, as specified in the "Features" section and confirmed in Table 7.6 Electrical Characteristics at 2.7 V supply. This value remains stable across the common-mode voltage range and increases to ≤28 µA over the full −40°C to +125°C temperature range, supporting reliable operation with standard shunt resistor values (e.g., 1–100 mΩ).