Texas Instruments INA190A3IDCKR

Overview

INA190A3IDCKR from Texas Instruments is a bidirectional, zero-drift, precision current-sense amplifier with 100 V/V fixed gain, ±15 µV max offset voltage, 132 dB min CMRR, and –0.2 V to +40 V wide common-mode input range. It operates from 1.7 V to 5.5 V supply and draws only 48 µA typical quiescent current, enabling microamp-level current measurement in battery-powered systems such as smartphone chargers and notebook PC power rails.

For engineers reviewing the INA190A3IDCKR datasheet, INA190A3IDCKR pinout, INA190A3IDCKR application, or INA190A3IDCKR equivalent, this device delivers verified bidirectional sensing capability, rail-to-rail output swing (GND +1 mV / VS –40 mV), low 0.5 nA input bias current, and SC70-6 package compatibility - critical for space-constrained, high-accuracy power monitoring designs.

Technical Context

The INA190A3IDCKR uses a capacitively coupled front-end architecture to achieve 150 dB typical common-mode rejection and isolate dc common-mode voltages from downstream stages. Its zero-drift design maintains ±15 µV max offset and 80 nV/°C max drift across –40°C to +125°C, enabling stable microamp-range measurements without calibration.

This variant implements fixed 100 V/V gain with ±0.3% max gain error and 35 kHz bandwidth (C_LOAD = 10 pF), optimized for high-side and low-side shunt monitoring where bus voltage exceeds supply rail - e.g., 40 V bus with 1.8 V supply. The SC70-6 package omits the ENABLE pin, confirming always-on operation without shutdown control.

Key Specifications

Pinout & Package

INA190A3IDCKR is housed in a 6-pin SC70 package (2.00 mm × 1.25 mm body), pin-compatible with industry-standard SC70 footprints. The ENABLE pin is not present in this variant - operation is always enabled.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA190A3IDCKR, INA219BIDR replaces analog output with I²C digital reporting and internal computation, simplifying MCU integration but limiting closed-loop analog control; MAX4008AASA+ trades 10× higher offset and larger SO-8 footprint for 6× greater bandwidth - optimal for transient-heavy rather than precision DC applications.

Availability

INA190A3IDCKR is available at Aetrix Electronics and suitable for smartphone battery management, notebook PC power rail monitoring, merchant server PSU design, and battery test equipment requiring stable component supply and long-term production continuity.

Supply support for INA190A3IDCKR 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 and embedded processing technologies, with decades of expertise in precision signal conditioning and power management ICs.

The INA190 product line was designed specifically for high-accuracy, low-power current sensing in space-constrained applications - targeting battery-powered consumer electronics, telecom infrastructure, and industrial power systems where microamp-level resolution and 40 V common-mode tolerance are essential.

FAQ

What is the maximum common-mode voltage supported by the INA190A3IDCKR?

The INA190A3IDCKR supports a common-mode input voltage range of –0.2 V to +40 V, independent of its 1.7 V to 5.5 V supply voltage. This allows it to accurately sense current on high-side 40 V rails while operating from a low 1.8 V supply - a key capability confirmed in the SBOS863D datasheet Section 6.3 and Figure 34.

Does the INA190A3IDCKR include an ENABLE pin?

No, the INA190A3IDCKR in the SC70-6 (DCK) package does not include an ENABLE pin. The ENABLE function is only available in the DDF (SOT-23-8) and RSW (UQFN-10) packages per Section 5 and footnote (1) of the SBOS863D datasheet. The INA190A3IDCKR operates continuously when powered.

What is the typical input bias current of the INA190A3IDCKR and why does it matter?

The INA190A3IDCKR has a typical input bias current of 0.5 nA, enabling accurate microamp-level current measurements and allowing high-impedance RC filters without introducing gain or offset errors. This value is specified in Section 6.5 Electrical Characteristics and directly supports use cases like battery leakage testing and ultra-low-power sensor nodes.

Can the INA190A3IDCKR perform bidirectional current sensing?

Yes, the INA190A3IDCKR supports bidirectional current sensing via its REF pin: applying a reference voltage (e.g., VS/2) establishes a zero-current output level, so positive differential inputs raise OUT above V_REF (forward current) and negative differentials lower OUT below V_REF (reverse current). This is explicitly described in Section 7.3.4 and Equation 1 of SBOS863D.

What is the gain error specification for the INA190A3IDCKR and how does it affect measurement accuracy?

The INA190A3IDCKR has a maximum gain error of ±0.3% across temperature, as stated in Section 6.5 for A3 devices. At full-scale output, this defines the dominant error term - for example, with 100 mV across R_SENSE, the output uncertainty is ±0.3 mV before offset contribution, directly impacting system-level current measurement fidelity in precision power monitoring.