Texas Instruments INA194AIDBVR

Overview

INA194AIDBVR from Texas Instruments is a high-side and low-side current shunt monitor IC with voltage output, designed to measure differential voltage across a shunt resistor at common-mode voltages from −16 V to +80 V while operating from a single 2.7-V to 18-V supply. It delivers 50 V/V fixed gain, 300 kHz bandwidth, ±2.2% total output error over temperature, and 900 μA max quiescent current-enabling precise current sensing in battery chargers and telecom power supplies.

For engineers reviewing the INA194AIDBVR datasheet, INA194AIDBVR pinout, INA194AIDBVR application, or INA194AIDBVR equivalent, key selection criteria include its wide common-mode range, SOT-23-5 package compatibility, 50 V/V transfer function, and operation down to −40°C for industrial embedded current monitoring.

Technical Context

The INA194AIDBVR uses a patented dual-amplifier front-end architecture that switches between A1 (active for negative common-mode) and A2 (active for positive common-mode), enabling seamless operation across −16 V to +80 V without external level-shifting. Its input stage converts VSENSE to current, then back to voltage via precision internal resistors, decoupling CMR from external resistor matching.

This architecture achieves 80–120 dB common-mode rejection and supports accurate sensing even when VCM exceeds V+, while maintaining 50 V/V gain accuracy within ±2.2% over −40°C to +125°C-critical for closed-loop current control in welding equipment and automotive battery management systems.

Key Specifications

Pinout & Package

INA194AIDBVR is housed in a 5-pin SOT-23 (DBV) package measuring 2.90 mm × 1.60 mm, optimized for space-constrained PCB layouts in portable and automotive electronics.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar current sensing applications.

Compared with INA194AIDBVR, INA194AIDBVT offers identical performance in tape-and-reel form for volume manufacturing, while INA240A1DRCR trades pin compatibility and fixed gain for improved offset and bandwidth-requiring redesign for gain scaling and layout adaptation.

Availability

INA194AIDBVR is available at Aetrix Electronics and suitable for battery chargers, telecom power supplies, and automotive embedded systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for INA194AIDBVR 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 signal chain and power management solutions.

The INA19x family was engineered for high-accuracy, wide common-mode current sensing in industrial, automotive, and computing power systems-delivering integrated solutions that eliminate external gain components and level-shift circuitry.

FAQ

What is the common-mode voltage range supported by the INA194AIDBVR?

The INA194AIDBVR supports a common-mode input voltage range of −16 V to +80 V, independent of its supply voltage (2.7 V to 18 V). This allows it to accurately sense current in both high-side and low-side shunt configurations-even in negative-rail or high-voltage bus applications such as telecom 48 V systems or automotive 12 V/48 V architectures. The specification is validated across the full −40°C to +125°C operating temperature range.

Does the INA194AIDBVR require external gain-setting resistors?

No, the INA194AIDBVR features a factory-trimmed fixed gain of 50 V/V and requires no external resistors for gain configuration. This eliminates component tolerance errors, reduces PCB area, and improves temperature stability compared to discrete op-amp-based current sense solutions. All internal resistors are matched to ±1%, ensuring consistent performance across production lots and temperature extremes.

What is the maximum bandwidth and settling time of the INA194AIDBVR?

The INA194AIDBVR has a bandwidth of 300 kHz and achieves 1% settling time of 2 μs for a 10 mV to 100 mV differential input step with 5 pF capacitive load. This performance is specified at TA = 25°C, VS = 12 V, and applies to applications including real-time current control in switch-mode power supplies and fast fault detection in battery protection circuits.

Can the INA194AIDBVR operate with a 3.3 V supply?

Yes, the INA194AIDBVR operates from a minimum supply voltage of 2.7 V, making it fully compatible with 3.3 V systems. At 3.3 V supply, it maintains full functionality-including −16 V to +80 V common-mode range, 50 V/V gain, and 900 μA max quiescent current-enabling integration into low-voltage portable electronics such as notebooks and handheld test equipment without level-shifting circuitry.

How does the INA194AIDBVR handle low differential input voltages below 20 mV?

For VSENSE < 20 mV, the INA194AIDBVR exhibits degraded accuracy: output may deviate up to 300 mV at VSENSE = 0 mV in certain common-mode regions (e.g., −16 V ≤ VCM < 0 V or VS < VCM ≤ 80 V). However, accuracy recovers fully above 20 mV. Designers should avoid relying on sub-20 mV operation for precision measurements and instead size shunts to ensure ≥20 mV full-scale drop under minimum expected current.