Texas Instruments INA302A1IPW

Overview

INA302A1IPW from Texas Instruments is a 36-V, bidirectional current-sense amplifier with dual integrated comparators configured for independent overcurrent detection. It delivers 20 V/V gain, ±30 µV max offset voltage (A3 version), <1 µs comparator-1 alert response, and operates from 2.7–5.5 V supply while monitoring common-mode voltages from –0.1 V to +36 V - used in server power-rail protection and motor phase-current fault detection.

For engineers reviewing the INA302A1IPW datasheet, INA302A1IPW pinout, INA302A1IPW application, or INA302A1IPW equivalent, this device supports fast, latchable overcurrent alerts in high-voltage industrial power systems where precision shunt-based current monitoring and dual-threshold fault response are required.

Technical Context

The INA302A1IPW integrates a zero-drift current-sense amplifier with two independent comparators: COMP1 triggers within 1 µs on overlimit events at LIMIT1, while COMP2 provides user-adjustable delay (2 µs–10 s) via external CDELAY on LIMIT2. Both comparators feature open-drain ALERT outputs with configurable latch/transparent modes via LATCH1/LATCH2 pins.

Its input stage accepts differential signals up to ±125 mV (A1 gain), maintains >100 dB CMRR across –0.1 V to +36 V common-mode range, and draws ≤950 µA quiescent current - enabling accurate, low-power current monitoring in high-side or low-side configurations without level-shifting circuitry.

Key Specifications

Pinout & Package

INA302A1IPW is housed in a 14-pin TSSOP package (4.40 mm × 5.00 mm), optimized for high-density PCB layouts and thermal performance (R_θJA = 110.2°C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar overcurrent protection applications.

Compared with INA303A1IPW and INA240A1PW, the INA302A1IPW uniquely combines fixed-fast and programmable-delay overcurrent alerts in a single 14-pin TSSOP, eliminating external timing components and reducing firmware dependency for dual-threshold protection schemes.

Availability

INA302A1IPW is available at Aetrix Electronics and suitable for server power-rail protection, industrial motor phase monitoring, and telecom rectifier modules requiring stable component supply and long-term industrial lifecycle support.

Supply support for INA302A1IPW 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 current-sensing solutions.

The INA30x product line was designed specifically for high-voltage, high-accuracy overcurrent protection in power-conversion systems - integrating sensing, comparison, and alert logic to simplify fault-response architectures.

FAQ

What is the maximum common-mode voltage the INA302A1IPW can measure?

The INA302A1IPW supports a common-mode input voltage range of –0.1 V to +36 V, enabling direct connection to high-voltage rails such as 24-V industrial buses or 36-V telecom supplies without external level-shifting circuitry. This specification is guaranteed across the full –40°C to +125°C operating temperature range and is independent of the 2.7–5.5-V supply voltage applied to the VS pin. The INA302A1IPW achieves this via proprietary input-stage architecture that isolates the amplifier core from rail voltage stress.

How does the ALERT2 delay function work on the INA302A1IPW?

The ALERT2 delay on the INA302A1IPW is set by an external capacitor (CDELAY) connected between the DELAY pin and GND. A precision internal current source (5 µA typ) charges CDELAY until it reaches a 1.22-V threshold, at which point the comparator triggers. Delay time = CDELAY × 1.22 V / 5 µA - yielding 2 µs to 10 s range. This allows suppression of brief transients while retaining sensitivity to sustained overcurrents. The INA302A1IPW does not support window-comparator behavior; ALERT2 is strictly overcurrent-only.

Can the INA302A1IPW perform bidirectional current sensing?

Yes, the INA302A1IPW supports bidirectional current sensing through the REF pin. Applying a mid-supply voltage (e.g., 2.5 V on a 5-V VS) to REF centers the OUT voltage at that level; positive differential input (IN+ > IN–) raises OUT above REF, while negative differential input lowers OUT below REF. This enables detection of both forward and reverse current flow using a single shunt resistor - confirmed in the INA302A1IPW functional description and typical application schematics.

What is the gain accuracy of the INA302A1IPW and how does it affect current measurement?

INA302A1IPW has a maximum gain error of ±0.15% and gain error drift of 10 ppm/°C. With its 20 V/V nominal gain, this translates to ±3-mV absolute output error at 1-V input - directly impacting current resolution when paired with a shunt resistor. For example, with a 10-mΩ shunt, ±0.15% gain error introduces ±1.5-A uncertainty at 100-A full scale. This high accuracy enables use of smaller, lower-power shunts while maintaining measurement fidelity in precision power systems.

Is the INA302A1IPW pin-compatible with other devices in the INA30x family?

The INA302A1IPW shares the same 14-pin TSSOP (PW) package and pinout with all INA30x variants including INA302A2IPW, INA302A3IPW, INA303A1IPW, and INA303A2IPW. Pin functions (VS, OUT, LIMIT1, REF, GND, LATCH1, LATCH2, LIMIT2, DELAY, ALERT2, ALERT1, IN–, IN+, NC) are identical across the family. However, internal comparator configurations differ: INA302 devices implement two independent overcurrent comparators, while INA303 devices implement a window comparator - requiring firmware and external resistor network adjustments despite mechanical compatibility.