Texas Instruments INA208AIDGSR

Overview

INA208AIDGSR from Texas Instruments is a unidirectional current-shunt monitor IC with 100 V/V gain, dual open-drain comparators (one latching, one 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 voltage, and delivers 500-kHz bandwidth for real-time shunt current sensing in high-side or low-side configurations. Used in server power rails, battery protection circuits, and telecom DC-DC converters.

For engineers reviewing the INA208AIDGSR datasheet, INA208AIDGSR pinout, INA208AIDGSR application, or INA208AIDGSR equivalent, key selection criteria include its 100 V/V fixed gain, 1.2-V reference output availability (TSSOP-14 only), latch/reset control on CMP1, user-adjustable delay on CMP2 via external capacitor, and operation across –40°C to 125°C industrial temperature range.

Technical Context

The INA208AIDGSR implements a precision current-sense amplifier with rail-to-rail output swing capability (to within 150 mV of Vs and 4 mV of GND), enabling accurate analog voltage representation of shunt voltage drops. Its dual comparator subsystem uses internal 0.6-V references with ±2-mV offset and 1.3-µs typical propagation delay - Comparator 1 features active-low reset and latched output, while Comparator 2 accepts external delay capacitance (0.1 µF = 0.5 s) on Pin 9 for overcurrent timing control.

As a 14-pin TSSOP device, INA208AIDGSR provides dedicated pins for overriding comparator reference inputs (Pins 3 and 6), sourcing 1.2-V reference (Pin 12), and configuring delay (Pin 9). The current-sense path achieves 100 dB CMRR at 12 V common-mode and maintains ±3.5% total output error over temperature, supporting high-accuracy measurement in noisy, wide-voltage systems like 48-V telecom supplies and automotive battery management.

Key Specifications

Pinout & Package

TSSOP-14 package (5.00 mm × 4.40 mm), thermally enhanced for surface-mount assembly in space-constrained power modules and server VRMs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA207AIDGSR and INA219BIDR, INA208AIDGSR provides highest analog gain for low-shunt-voltage applications, autonomous dual-comparator fault handling without MCU involvement, and integrated 1.2-V reference - making it optimal for analog-centric, safety-critical power monitoring where speed and simplicity are prioritized.

Availability

INA208AIDGSR is available at Aetrix Electronics and suitable for server power management, battery protection systems, and telecom DC-DC converters requiring stable component supply with guaranteed long-term manufacturability.

Supply support for INA208AIDGSR 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-accuracy, high-common-mode current sensing in power supply, battery, and motor control applications - delivering integrated analog signal chain functionality (amplifier + comparators + references) in compact packages.

FAQ

What is the maximum common-mode voltage supported by the INA208AIDGSR?

The INA208AIDGSR supports a common-mode input voltage range from –16 V to +80 V on its VIN+ and VIN– pins. This allows direct high-side sensing in 48-V and 60-V industrial and telecom power systems without external level-shifting circuitry. The specification is validated across the full –40°C to 125°C operating temperature range and applies to both SOIC and TSSOP-14 packages.

Does the INA208AIDGSR require external components to configure its comparators?

The INA208AIDGSR includes internal 0.6-V references for both comparators and requires no external components for basic operation. However, Pins 3 and 6 allow overriding those references with external voltages for custom thresholds, and Pin 9 requires an external capacitor (e.g., 0.1 µF) to enable Comparator 2's programmable delay function. No external resistors are needed for gain or reference generation.

Can the INA208AIDGSR operate from a 3.3-V supply?

Yes, the INA208AIDGSR operates from a single supply ranging from 2.7 V to 18 V. At 3.3 V, its output swing is limited to approximately 0.004 V above GND and 3.15 V below VS, and the 1.2-V reference (Pin 12) remains valid. However, full 100× gain output (e.g., 10 V for 100 mV sense) is not achievable - users must ensure the expected output voltage stays within the 3.3-V rail constraints.

How does the latching behavior of CMP1 work on the INA208AIDGSR?

Comparator 1 (CMP1) on the INA208AIDGSR features a latched output: once triggered (when CMP1 IN+ exceeds CMP1 IN–), CMP1 OUT remains asserted until an active-low pulse ≥1.5 µs is applied to the CMP1 RESET pin (Pin 8). Leaving Pin 8 open or grounded enables automatic reset at power-up. This latching behavior enables persistent fault indication without continuous MCU polling.

Is the 1.2-V reference output on the INA208AIDGSR capable of driving external loads?

Yes, the 1.2-V reference output (Pin 12) on the INA208AIDGSR can source up to 1 mA while maintaining ±12 mV accuracy and <100 ppm/°C drift. Load regulation is specified at 0.4 mV/mA, meaning a 0.5-mA load introduces ≤0.2 mV error. For heavier loads, an external buffer amplifier is recommended to preserve reference stability and accuracy.