Texas Instruments INA202AID

Overview

INA202AID from Texas Instruments is a high-side current-shunt monitor IC with 100 V/V gain, integrated open-drain comparator, and 0.6-V internal reference. It operates from –16 V to 80 V common-mode input range and delivers voltage output for precision shunt-based current sensing in power rails up to 80 V, such as battery protection circuits and telecom DC-DC converters.

For engineers reviewing the INA202AID datasheet, INA202AID pinout, INA202AID application, or INA202AID equivalent, key selection criteria include its 100× gain accuracy (±2% over temperature), 200-kHz bandwidth, latching comparator with RESET control, and SOIC-8/VSSOP-8 package compatibility for space-constrained industrial power monitoring designs.

Technical Context

The INA202AID implements a precision current-sense amplifier with fixed 100 V/V gain and an independent open-drain comparator stage referenced to a 0.6-V internal threshold. Its input stage supports wide common-mode operation (–16 V to 80 V) using a proprietary topology that maintains accuracy across supply voltages from 2.7 V to 18 V.

The comparator features latching behavior controlled by the RESET pin (active-low, 1.1-V threshold), with typical 1.3-μs response time and ±8-mV hysteresis. The device draws ≤1800 μA quiescent current and is specified for –40°C to +125°C operation in both SOIC-8 and VSSOP-8 packages.

Key Specifications

Pinout & Package

INA202AID is available in SOIC-8 (4.90 mm × 3.91 mm) and VSSOP-8 (3.00 mm × 3.00 mm) packages. Both are surface-mount, leaded, and RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA202AID, INA203AID offers identical sensing performance with a higher reference voltage for simplified threshold scaling, while MAX4005ASA+ trades latching capability for lower propagation delay and no RESET dependency-making it preferable for fast-response, non-latching fault detection.

Availability

INA202AID is available at Aetrix Electronics and suitable for battery protection, telecom power conversion, automotive body control, industrial motor drives, and welding equipment requiring stable component supply across extended temperature and voltage ranges.

Supply support for INA202AID 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 analog signal chains and power management ICs.

The INA20x product line was designed specifically for high-side current sensing in harsh industrial and automotive environments, integrating amplifier, reference, and comparator functions into a single compact package to reduce system complexity and improve reliability.

FAQ

What is the maximum common-mode voltage supported by the INA202AID?

The INA202AID supports a common-mode input voltage range of –16 V to +80 V. This allows direct high-side current sensing on negative-rail systems (e.g., automotive cold-crank at –16 V) and high-voltage telecom or industrial buses (e.g., 48-V or 60-V supplies). Operation at the extremes requires adherence to recommended operating conditions, including proper bypassing and Kelvin shunt connections to maintain accuracy.

Does the INA202AID require external components to operate its comparator function?

Yes, the INA202AID comparator requires two external components: a resistor divider network from OUT to GND to set the trip point at CMPIN, and a pull-up resistor (typically 4.7–10 kΩ) from CMPOUT to a logic-compatible voltage (2.7–18 V). The internal 0.6-V reference eliminates need for an external reference IC, but the threshold scaling and output pull-up remain external responsibilities for design flexibility.

How does the RESET pin affect comparator behavior in the INA202AID?

The RESET pin on the INA202AID controls latching mode: when held low (≤1.1 V) or left floating (internal 2-MΩ pull-down ensures low state), the comparator operates in transparent mode; when driven high (>1.1 V), it enters latched mode and holds CMPOUT low after tripping until RESET is pulsed low again. This dual-mode operation enables flexible fault-handling strategies-from momentary alerts to persistent lockout-without changing hardware.

What is the bandwidth and gain error specification for the INA202AID at full temperature range?

The INA202AID has a small-signal bandwidth of 200 kHz (C_LOAD = 5 pF) and a total output error of ±3.5% over the full –40°C to +125°C range. This error includes contributions from gain error (±2%), offset voltage drift (±3.5 mV), and common-mode rejection degradation. The 100× gain remains stable across frequency and temperature, making it suitable for both steady-state monitoring and transient overload detection.

Can the INA202AID be used in bidirectional current sensing applications?

Yes, the INA202AID supports bidirectional sensing when configured with external circuitry. By connecting the shunt between VIN+ and VIN– and biasing CMPIN with a resistive divider referenced to a midpoint voltage (e.g., VS/2), the comparator can detect current flow in either direction. Figure 30 in the datasheet shows a validated implementation using dual resistive networks and a reference buffer to generate symmetric ±0.6-V thresholds for forward/reverse trip points.