Texas Instruments INA199C3QDCKRQ1

Overview

INA199C3QDCKRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive current-sense amplifier with bidirectional capability, zero-drift architecture, and fixed 200 V/V gain. It operates from 2.7 V to 26 V supply, supports common-mode input range from –0.1 V to 26 V, delivers ±150 μV max offset voltage, and achieves ±1% max gain error over –40°C to +125°C - enabling precise low-side or high-side shunt monitoring in brake systems and body control modules.

For engineers reviewing the INA199C3QDCKRQ1 datasheet, INA199C3QDCKRQ1 pinout, INA199C3QDCKRQ1 application, or INA199C3QDCKRQ1 equivalent, key selection criteria include its 200 V/V fixed gain, SC70-6 package footprint, 0.5 μV/°C max offset drift, 14 kHz bandwidth, and functional safety documentation support for ISO 26262-compliant automotive designs.

Technical Context

The INA199C3QDCKRQ1 implements a zero-drift chopper-stabilized topology to maintain ultra-low offset (±150 μV) and minimal drift (0.5 μV/°C) across automotive temperature extremes. Its differential input stage rejects common-mode voltages up to 26 V independent of supply voltage, supporting both high-side and low-side sensing configurations without external level-shifting circuitry.

Internal precision resistor networks set the 200 V/V gain (R3 = 5 kΩ, R4 = 1 MΩ), while the REF pin allows output offset adjustment from 0 V to V+. The device draws only 100 μA max quiescent current and features 100 dB min CMRR at DC, ensuring robust performance in noisy 12 V/24 V vehicle electrical environments.

Key Specifications

Pinout & Package

INA199C3QDCKRQ1 is housed in a 6-pin SC70 package (2.00 mm × 1.25 mm body size), optimized for space-constrained automotive PCBs and compatible with standard reflow assembly processes.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A3QDRQ1 and MAX40056ATA+T, the INA199C3QDCKRQ1 uniquely balances AEC-Q100 Grade 1 compliance, 26 V common-mode capability, and ultra-low 100 μA quiescent current - making it optimal for always-on, space-constrained, 12 V/24 V automotive subsystems where power efficiency and qualification rigor are mandatory.

Availability

INA199C3QDCKRQ1 is available at Aetrix Electronics and suitable for brake systems, body control modules, electric windows, and seat heaters requiring stable component supply in automotive production programs.

Supply support for INA199C3QDCKRQ1 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 automotive-grade signal conditioning and power management ICs.

The INA199-Q1 product line was designed specifically for high-precision, low-power current sensing in automotive body electronics and chassis systems, emphasizing AEC-Q100 compliance, zero-drift stability, and seamless integration with 12 V/24 V vehicle architectures.

FAQ

What is the maximum common-mode voltage supported by the INA199C3QDCKRQ1?

The INA199C3QDCKRQ1 supports a common-mode input voltage range of –0.1 V to 26 V, independent of supply voltage. This allows direct connection to battery rails or high-side shunt locations in 12 V and 24 V automotive systems. Operation above 26 V is not recommended per absolute maximum ratings, though transient protection circuits can extend robustness for short-duration load-dump events.

Does the INA199C3QDCKRQ1 require external resistors to set gain?

No, the INA199C3QDCKRQ1 has a factory-trimmed fixed gain of 200 V/V achieved through internal precision thin-film resistors (R3 = 5 kΩ, R4 = 1 MΩ). No external gain-setting components are needed, eliminating tolerance errors and board space overhead associated with discrete resistor networks.

How does the REF pin function in the INA199C3QDCKRQ1?

The REF pin on the INA199C3QDCKRQ1 sets the output voltage common-mode level. When tied to GND, the output swings from ~5 mV to (V+) – 50 mV; when biased to V+/2, the output centers at V+/2. This flexibility enables direct interfacing with single-ended ADCs, differential receivers, or ratiometric sensor interfaces without additional level-shifting circuitry.

Is the INA199C3QDCKRQ1 suitable for bidirectional current sensing?

Yes, the INA199C3QDCKRQ1 supports true bidirectional current sensing. Its ability to accept common-mode voltages down to –0.1 V allows the IN– pin to go slightly negative relative to GND, enabling accurate measurement of reverse current flow - essential for applications like regenerative braking monitoring or reversible motor control in power seats and windows.

What packaging and thermal characteristics apply to the INA199C3QDCKRQ1?

The INA199C3QDCKRQ1 uses a 6-pin SC70 package (2.00 mm × 1.25 mm) with a junction-to-ambient thermal resistance (RθJA) of 227.3°C/W. Its small footprint suits dense automotive PCB layouts, while the specified thermal metrics support thermal modeling for sustained operation at +125°C ambient in enclosed modules like door ECUs or seat control units.