Texas Instruments INA203AIDGSTG4

Overview

INA203AIDGSTG4 from Texas Instruments is a unidirectional current-shunt monitor IC with 20 V/V gain, dual open-drain comparators (CMP1 latched, CMP2 delay-programmable), and integrated 1.2-V reference output. It operates from 2.7 V to 18 V, supports –16 V to 80 V common-mode input range, and delivers 500-kHz bandwidth for real-time shunt-based current sensing in high-side or low-side configurations. It is used in telecom power supplies for overcurrent fault detection and protection.

For engineers reviewing the INA203AIDGSTG4 datasheet, INA203AIDGSTG4 pinout, INA203AIDGSTG4 application, or INA203AIDGSTG4 equivalent, key selection criteria include its 20 V/V fixed gain accuracy (±2% over temperature), latch/reset control on CMP1 OUT, user-adjustable delay on CMP2 via external capacitor, and 1.2-V REF OUT capability - all in a space-constrained 10-pin VSSOP package.

Technical Context

The INA203AIDGSTG4 integrates a precision current-sense amplifier, two independent comparators, and a buffered 1.2-V reference in a single die. Its current-sense path features 80 dB minimum CMRR and ±2.5 mV max offset voltage (RTI) across –40°C to 125°C, enabling accurate measurement at low shunt voltages (≥20 mV). The comparator subsystem includes internal 0.6-V references (pins 3 and 6 not present in 10-pin variant), but the VSSOP-10 package omits pins for overriding those references and excludes the CMP2 DELAY terminal.

Unlike the 14-pin SOIC/TSSOP variants, the INA203AIDGSTG4 (VSSOP-10) does not provide 1.2-V REF OUT, CMP2 DELAY, or comparator reference override inputs. Its pinout supports only core functions: VIN+, VIN−, VS, GND, OUT, CMP1 IN+, CMP2 IN+, CMP1 OUT, CMP2 OUT, and CMP1 RESET - eliminating external delay capacitor routing while retaining latch and dual-comparator alerting.

Key Specifications

Pinout & Package

VSSOP-10 package: 3.00 mm × 3.00 mm body, 0.5-mm lead pitch, exposed thermal pad (not electrically connected), RoHS-compliant, moisture sensitivity level 2.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar current-shunt monitor applications.

Compared with INA204AIDGST and INA205AIDGST, the INA203AIDGSTG4 offers the best balance of bandwidth (500 kHz), gain accuracy (±2%), and noise immunity for general-purpose 50–100 mV shunt designs - making it the default choice unless extreme sensitivity or higher gain is mandatory.

Availability

INA203AIDGSTG4 is available at Aetrix Electronics and suitable for telecom power systems, industrial motor drives, automotive battery monitors, and laptop adapter protection requiring stable component supply and long-term lifecycle support.

Supply support for INA203AIDGSTG4 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 signal conditioning and power management ICs.

The INA20x family was designed specifically for high-voltage unidirectional current sensing in power conversion and protection systems - delivering integrated gain, reference, and dual-comparator fault signaling in compact packages.

FAQ

What is the maximum common-mode voltage the INA203AIDGSTG4 can handle?

The INA203AIDGSTG4 supports a common-mode input voltage range of –16 V to 80 V. This allows direct high-side sensing on 48-V telecom buses or industrial 60-V DC lines without level-shifting circuitry. The specification is guaranteed across the full operating temperature range (–40°C to 125°C) and applies to both VIN+ and VIN− pins simultaneously.

Does the INA203AIDGSTG4 provide a 1.2-V reference output?

No. The INA203AIDGSTG4 is the VSSOP-10 variant and does not include the 1.2-V REF OUT pin. That feature is exclusive to the 14-pin SOIC and TSSOP packages (e.g., INA203AIDR). The VSSOP-10 version retains only the internal 0.6-V comparator reference, which is not accessible externally.

Can the comparator delay function be used on the INA203AIDGSTG4?

No. The CMP2 DELAY pin and associated programmable delay circuitry are omitted in the VSSOP-10 package. Comparator 2 on the INA203AIDGSTG4 operates with fixed 1.3-μs response time and no external timing capacitor option - unlike the 14-pin versions where delay is set via C_DELAY.

What is the output type of the INA203AIDGSTG4 current-sense amplifier?

The INA203AIDGSTG4 features a rail-to-rail capable voltage-output stage. Its OUT pin delivers a buffered analog voltage proportional to shunt current, with swing from (GND + 4 mV) to (VS – 0.25 V) under load. It is not a current-output or digital device - it interfaces directly with ADCs or analog controllers.

Is the INA203AIDGSTG4 pin-compatible with other INA20x variants in VSSOP-10?

Yes. All VSSOP-10 variants - INA203AIDGSTG4, INA204AIDGST, and INA205AIDGST - share identical pinout, package dimensions, and thermal characteristics. Only the gain (20/50/100 V/V) and corresponding bandwidth/error specs differ; no PCB redesign is needed when upgrading between them.