Texas Instruments INA190A2IDCKT

Overview

INA190A2IDCKT from Texas Instruments is a bidirectional, zero-drift, precision current-sense amplifier with 50 V/V fixed gain, ±0.3% max gain error, ±15 µV max offset voltage, and 1.7–5.5 V supply range. It operates over –40°C to +125°C and supports high-side or low-side sensing across –0.2 V to +40 V common-mode voltage - enabling accurate microamp-level current monitoring in battery-powered portable electronics.

For engineers reviewing the INA190A2IDCKT datasheet, INA190A2IDCKT pinout, INA190A2IDCKT application, or INA190A2IDCKT equivalent, key selection considerations include its 50 V/V gain accuracy, 500 pA typical input bias current for ultra-low-current measurement, rail-to-rail output swing (GND + 1 mV / VS – 40 mV), and SC70-6 package compatibility with space-constrained PCB layouts.

Technical Context

The INA190A2IDCKT uses a capacitively coupled front-end architecture to achieve 132 dB min CMRR and reject DC common-mode voltage shifts - critical for stable sensing on noisy bus rails up to +40 V. Its zero-drift design maintains <80 nV/°C offset drift and enables use of smaller sense resistors without sacrificing light-load accuracy.

This variant implements bidirectional sensing via the REF pin, where an externally applied reference voltage sets the zero-current output level; differential input voltage (IN+ – IN–) is amplified by 50× and offset by VREF to produce a rail-to-rail analog output. The SC70-6 package omits the ENABLE pin - confirming always-on operation with 48 µA typical quiescent current.

Key Specifications

Pinout & Package

INA190A2IDCKT is housed in a 6-pin SC70 package (2.00 mm × 1.25 mm body size) with no ENABLE pin - confirming it is the always-enabled variant within the INA190 family. Pin functions are validated per TI SBOS863D Rev D.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA190A2IDCKT, INA219BIDR trades analog output simplicity for digital integration and higher baseline accuracy, while MAX4008AASA+ offers lower cost but sacrifices zero-drift stability and microamp measurement capability - making INA190A2IDCKT optimal for precision analog current feedback in portable and industrial power systems.

Availability

INA190A2IDCKT is available at Aetrix Electronics and suitable for smartphone battery monitoring, notebook PC power management, and merchant server PSU designs requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for INA190A2IDCKT 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, battery-operated, and industrial power systems - emphasizing zero-drift performance, wide common-mode range, and SC70/UQFN/SOT-23 scalability.

FAQ

What is the maximum common-mode voltage supported by the INA190A2IDCKT?

The INA190A2IDCKT supports a common-mode input voltage range of –0.2 V to +40 V, independent of its 1.7–5.5 V supply voltage. This enables direct high-side sensing on 12-V, 24-V, or 36-V rails without external level-shifting circuitry - a confirmed specification from TI SBOS863D Rev D Section 6.3.

Does the INA190A2IDCKT have an enable pin?

No, the INA190A2IDCKT does not include an ENABLE pin. It is packaged in the 6-pin SC70 (DCK) variant, which - per TI documentation - omits ENABLE functionality. Only DDF (SOT-23-8) and RSW (UQFN-10) packages support ENABLE; the INA190A2IDCKT operates continuously when powered.

What is the typical input bias current of the INA190A2IDCKT?

The INA190A2IDCKT has a typical input bias current of 0.5 nA, with a maximum of 3 nA over temperature. This ultra-low value enables accurate microamp-level current measurements and permits use of high-impedance RC filters without degrading gain or offset accuracy - verified in Electrical Characteristics Table 6.5 of the official datasheet.

Can the INA190A2IDCKT perform bidirectional current sensing?

Yes, the INA190A2IDCKT supports bidirectional current sensing via its REF pin. Applying a mid-supply reference voltage (e.g., 0.9 V on a 1.8-V rail) centers the output at that level; positive IN+–IN– differential produces output above REF, and negative differential produces output below REF - a core feature confirmed in Section 7.3.4 of SBOS863D.

What is the gain error specification for the INA190A2IDCKT?

The INA190A2IDCKT has a maximum gain error of ±0.3%, applicable to A2, A3, and A4 variants per Table 6.5 of SBOS863D. This error remains stable over –40°C to +125°C with a drift of ≤7 ppm/°C, ensuring consistent current measurement accuracy across operating conditions without recalibration.