Texas Instruments INA302A2IPWR

Overview

INA302A2IPWR from Texas Instruments is a 36-V, bidirectional current-sense amplifier with dual integrated comparators configured for overcurrent protection. It features 50 V/V gain, ±50 mV input voltage range (referred-to-input), 30 µV max offset voltage (A2 version), and 1 µs alert response on ALERT1 - deployed in high-side motor phase monitoring and DC bus overcurrent detection.

For engineers reviewing the INA302A2IPWR datasheet, INA302A2IPWR pinout, INA302A2IPWR application, or INA302A2IPWR equivalent, this device delivers precision current sensing up to +36 V common-mode while operating from a low 2.7–5.5 V supply - critical for industrial power modules, server VRMs, and telecom rectifiers requiring fast, latchable fault alerts.

Technical Context

The INA302A2IPWR integrates a zero-drift current-sense amplifier with two independent comparators: COMP1 triggers within 1 µs on overlimit events at LIMIT1, while COMP2 supports adjustable delay (2 µs–10 s) via external CDELAY on LIMIT2. Its –0.1 V to +36 V common-mode input range enables direct sensing on high-voltage rails without level-shifting.

Both comparators feature open-drain ALERT outputs with programmable latch/transparent modes via LATCH1/LATCH2 pins, and internal 80 µA current sources at LIMIT1/LIMIT2 pins enable resistor-set thresholds. The amplifier's 440 kHz bandwidth and 4 V/µs slew rate support dynamic load transient detection in real-time protection systems.

Key Specifications

Pinout & Package

INA302A2IPWR is housed in a 14-pin TSSOP package (4.40 mm × 5.00 mm body size) with exposed thermal pad for enhanced power dissipation in continuous-current monitoring applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA302A1IPWR and INA303A2IPWR, the INA302A2IPWR provides optimal resolution for sub-2 A fault detection with 50× gain, while retaining identical pinout, supply, and temperature specs - making it the preferred choice for precision high-side overcurrent cutoff in compact power stages.

Availability

INA302A2IPWR is available at Aetrix Electronics and suitable for motor control, server VRM monitoring, and telecom rectifier protection requiring stable component supply across extended temperature and high-reliability production cycles.

Supply support for INA302A2IPWR 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 protection ICs.

The INA30x product line was designed specifically for high-voltage current monitoring with integrated fault detection - targeting industrial motor drives, enterprise power supplies, and telecom infrastructure where fast, reliable overcurrent response is mandatory.

FAQ

What is the maximum common-mode voltage the INA302A2IPWR can handle?

The INA302A2IPWR supports a common-mode input voltage range of –0.1 V to +36 V, enabling direct connection to high-side power rails up to 36 V without external level-shifting circuitry. This specification is guaranteed across the full –40°C to +125°C operating temperature range and applies independently of the 2.7–5.5 V supply voltage. The device remains functional and undamaged even when IN+ or IN– exceeds VS by up to 36 V.

How does the ALERT2 delay function work on the INA302A2IPWR?

The ALERT2 delay on the INA302A2IPWR is set by an external capacitor (C_DELAY) connected between the DELAY pin and GND. An internal 5 µA current source charges C_DELAY until it reaches a 1.22 V threshold, at which point the comparator triggers. Delay time t = C_DELAY × 1.22 V / 5 µA - yielding 2 µs to 10 s range. For example, 100 pF gives ~24.4 ns delay; 10 µF gives ~2.44 s. The DELAY pin must not be left floating.

Can the INA302A2IPWR measure bidirectional current, and how is it configured?

Yes, the INA302A2IPWR supports bidirectional current sensing via the REF pin. Applying a mid-supply voltage (e.g., 2.5 V with 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. The ±50 mV input range (A2 version) maps to 0–5 V output swing, enabling full-scale measurement of current flow in either direction through the shunt resistor.

What is the purpose of the LATCH1 and LATCH2 pins on the INA302A2IPWR?

LATCH1 and LATCH2 are digital control inputs that configure ALERT1 and ALERT2 outputs respectively into latched or transparent mode. When pulled high, the corresponding ALERT output remains low after tripping until manually cleared (e.g., by cycling power or toggling the latch pin low then high). When low, the output follows the comparator state in real time. This enables flexible fault-handling strategies - e.g., latching critical faults while allowing transient overloads to self-clear.

What shunt resistor value is recommended for use with the INA302A2IPWR at full-scale?

For full-scale operation with the INA302A2IPWR's ±50 mV input range and 50 V/V gain, a shunt resistor value is selected so that maximum expected current produces ≤50 mV drop. For example: 1 A max current → R_SHUNT = 50 mV / 1 A = 50 mΩ; 2 A max → 25 mΩ. Standard values like 25 mΩ, 50 mΩ, or 100 mΩ (for 0.5 A) are commonly used. Power rating must exceed I²R - e.g., 2 A through 50 mΩ dissipates 200 mW, requiring ≥0.25 W rating.