Texas Instruments INA303A2IPWR

Overview

INA303A2IPWR from Texas Instruments is a 36-V, bidirectional current-sense amplifier with integrated window comparator functionality, precision gain of 50 V/V, max offset voltage of 30 µV, and dual open-drain alert outputs for overcurrent/undercurrent detection in high-side or low-side sensing applications-used in motor control and power-supply protection circuits.

For engineers reviewing the INA303A2IPWR datasheet, INA303A2IPWR pinout, INA303A2IPWR application, or INA303A2IPWR equivalent, this page delivers verified specifications, TSSOP-14 pin mapping, real-world use cases, and validated alternative parts for overcurrent monitoring systems requiring ±50-mV input range, sub-1-µs ALERT1 response, and adjustable ALERT2 delay up to 10 s.

Technical Context

The INA303A2IPWR implements a zero-drift amplifier architecture enabling 30 µV max offset and 0.5 µV/°C max drift across –40°C to +125°C, paired with two independent comparators: COMP1 operates as fast overlimit detector (≤1 µs propagation), while COMP2 functions as a window comparator with user-adjustable undercurrent threshold (LIMIT2) and programmable delay (2 µs–10 s via CDELAY).

It supports common-mode input voltages from –0.1 V to +36 V independent of its 2.7–5.5 V supply, uses external resistors to set LIMIT1/LIMIT2 thresholds, and offers latch/transparent mode control per alert output via dedicated LATCH1/LATCH2 digital inputs.

Key Specifications

Pinout & Package

INA303A2IPWR is housed in a 14-pin TSSOP package (4.4 mm × 5.0 mm, 0.65-mm pitch), optimized for thermal performance (RθJA = 110.2°C/W) and PCB space efficiency in high-density power management layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA303A1IPWR and INA303A3IPWR, the INA303A2IPWR strikes a balance between sensitivity and dynamic range-delivering optimal resolution for 5–10-mΩ shunts in 5–20-A applications while maintaining robust noise rejection and thermal stability across –40°C to +125°C.

Availability

INA303A2IPWR is available at Aetrix Electronics and suitable for motor control, power-supply protection, and industrial PLC applications requiring stable component supply, extended temperature operation, and precision current monitoring with dual-threshold fault detection.

Supply support for INA303A2IPWR 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 amplifiers and real-time signal conditioning ICs.

The INA30x product line was designed specifically for high-reliability overcurrent/undercurrent protection in industrial, automotive, and computing power systems-integrating precision amplification and intelligent fault detection in a single compact package.

FAQ

What is the maximum common-mode input voltage supported by the INA303A2IPWR?

The INA303A2IPWR supports a common-mode input voltage range of –0.1 V to +36 V, independent of its 2.7–5.5 V supply voltage. This allows direct high-side sensing on 24-V or 36-V industrial rails without level-shifting circuitry. The specification is guaranteed across the full operating temperature range (–40°C to +125°C) and applies to both IN+ and IN– pins simultaneously.

How does the window comparator function differ between INA302 and INA303 variants?

The INA303A2IPWR implements a true window comparator: LIMIT1 sets the upper (overcurrent) threshold and LIMIT2 sets the lower (undercurrent) threshold relative to the REF voltage. In contrast, the INA302 uses both comparators for overcurrent detection only. This makes the INA303A2IPWR uniquely suited for detecting open-load faults or pump stall conditions where current drops below a safe minimum.

What is the purpose of the DELAY pin on the INA303A2IPWR, and how is it configured?

The DELAY pin on the INA303A2IPWR sources a precision 5-µA current to charge an external capacitor (CDELAY), setting the response time of ALERT2 from 2 µs to 10 s. The delay time is calculated as t = (CDELAY × VTH) / ID, where VTH = 1.22 V and ID = 5 µA. A 10-nF capacitor yields ~2.4 ms delay; larger values enable long-duration fault holdoff without software intervention.

Can the INA303A2IPWR operate with a 3.3-V supply, and what impact does that have on performance?

Yes, the INA303A2IPWR operates from 2.7 V to 5.5 V, including 3.3-V systems. At 3.3 V, the output swing reduces to (3.3 V – 0.1 V) / (GND + 30 mV), and the REF pin range becomes 0–3.3 V. All key specs-including offset (30 µV max), gain error (0.15% max), and ALERT1 response (≤1 µs)-remain fully guaranteed across the entire supply range per the datasheet's Recommended Operating Conditions table.

What is the role of the LATCH1 and LATCH2 pins on the INA303A2IPWR?

LATCH1 and LATCH2 are dedicated digital inputs that configure ALERT1 and ALERT2 to operate in either transparent mode (low logic level) or latched mode (high logic level). In latched mode, the alert output remains asserted until manually cleared-enabling persistent fault indication for safety-critical systems. Both pins accept standard CMOS logic levels (VIH ≥1.4 V, VIL ≤0.4 V) and draw <1 µA leakage current.