Texas Instruments INA271SHKJ

Overview

INA271SHKJ from Texas Instruments is a high-temperature voltage-output unidirectional current-shunt monitor with –16V to +80V common-mode input range, 20V/V fixed gain, 130kHz bandwidth, and ±10mV max offset - designed for down-hole drilling and extreme-environment current sensing in power rails up to +80V.

For engineers reviewing the INA271SHKJ datasheet, INA271SHKJ pinout, INA271SHKJ application, or INA271SHKJ equivalent, this page delivers verified specifications, thermal derating context, HKJ ceramic flatpack package details, and two validated alternative parts for high-temperature current monitoring where supply independence and wide common-mode operation are critical.

Technical Context

The INA271SHKJ uses dual-op-amp front-end architecture to sustain operation across –16V to +80V common-mode voltages independent of its +2.7V to +18V supply rail. Its 20V/V transfer function is implemented via laser-trimmed internal resistors with ±7.5% max total gain error over –55°C to +210°C.

It features separate preamp output (PRE OUT, 96kΩ) and buffered output (OUT) stages, enabling external single-pole or Sallen-Key filtering without loading the gain stage. The device draws ≤1600μA quiescent current and supports stable operation up to 210°C junction temperature with controlled baseline manufacturing.

Key Specifications

Pinout & Package

INA271SHKJ is housed in an 8-pin CFP (Ceramic Flatpack) HKJ package with metal lid, rated for –55°C to +210°C operation. Thermal resistance θ_JC is 5.7°C/W to ceramic case side and 13.7°C/W to metal lid top.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar current-shunt monitoring applications.

Compared with INA271SHKJ, INA271SHKQ offers identical high-temperature capability with improved manufacturability, while INA271AHD trades 35°C max junction temperature for broader availability and lower cost in non-down-hole applications.

Availability

INA271SHKJ is available at Aetrix Electronics and suitable for down-hole drilling instrumentation, high-temperature motor drives, and avionics load monitoring requiring stable component supply across extended temperature lifecycles.

Supply support for INA271SHKJ 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 leader specializing in analog, embedded processing, and high-reliability ICs with decades of expertise in precision signal conditioning and extreme-environment design.

The INA271-HT product line targets ultra-high-temperature industrial and aerospace applications, delivering supply-independent current sensing where conventional monitors fail due to thermal or common-mode limitations.

FAQ

What is the maximum junction temperature rating for the INA271SHKJ?

The INA271SHKJ is qualified for continuous operation up to +210°C junction temperature, with lifetime derating defined in Figure 1 of the SBOS521D datasheet. At 210°C, the silicon design goal is 10 years at 105°C - actual life depends on thermal management and operating voltage stress. The HKJ package's θ_JC of 5.7°C/W to ceramic enables effective heat sinking in down-hole modules.

Does the INA271SHKJ require external filtering components to meet EMC requirements?

The INA271SHKJ does not require mandatory external filtering but provides dedicated PRE OUT and BUF IN pins to implement optional RC or Sallen-Key filters - especially valuable for reducing RFI/EMI sensitivity in noisy environments like motor drives. Layout best practices (short traces, ground plane, 0.01μF/0.1μF bypass caps) are essential; the device itself has no integrated EMI suppression beyond standard internal ESD structures.

Can the INA271SHKJ measure bidirectional current flow?

No, the INA271SHKJ is specified exclusively for unidirectional current measurement. Its transfer function outputs only positive voltage for positive V_SENSE (IN+ > IN−), and it lacks a reference input or bipolar output swing. For bidirectional sensing, TI's INA282 or INA293 families - which offer split-rail operation and symmetric output ranges - are appropriate alternatives.

What is the purpose of the NC pin on the INA271SHKJ?

Pin 7 of the INA271SHKJ is marked NC (No Connection) and contains no internal bond wire or circuit connection. It is an unpopulated pad in the HKJ CFP package layout. This pin must remain floating - no PCB trace, via, or ground connection should be made to it, as doing so may compromise hermeticity or thermal performance of the ceramic package.

How does the INA271SHKJ maintain accuracy when V+ is lower than the common-mode voltage?

The INA271SHKJ uses a dual-op-amp front-end architecture that operates independently of V+, allowing accurate sensing even when V+ = +5V and V_CM = +80V. Input stage biasing is internally regulated, so offset, gain, and CMRR remain within datasheet limits. However, the output swing is constrained by V+ - e.g., OUT cannot exceed V+ – 0.05V - so downstream signal conditioning must accommodate this limitation.