Texas Instruments INA208AID

Overview

INA208AID from Texas Instruments is a unidirectional current-shunt monitor IC with 100 V/V gain, dual open-drain comparators (one latching, one with programmable delay), and integrated 1.2-V/0.6-V references. 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. It is used in server power rails, battery chargers, and telecom equipment for overcurrent detection and fault signaling.

For engineers reviewing the INA208AID datasheet, INA208AID pinout, INA208AID application, or INA208AID equivalent, this page provides verified functional specifications, SO-14/TSSOP-14 package details, comparator timing behavior, reference output accuracy, and validated alternative part selection guidance - all grounded in TI SBOS360F (Nov 2015) revision.

Technical Context

The INA208AID implements a precision current-sense amplifier with fixed 100 V/V gain, enabling accurate conversion of 10–100 mV shunt voltage drops into 1–10 V output signals. Its dual comparators operate independently: CMP1 features internal 0.6-V threshold with latch/reset control via dedicated pin, while CMP2 offers user-programmable delay (via external capacitor on CMP2 DELAY pin) and override-capable reference inputs.

Designed for high-common-mode environments, the device uses a proprietary topology to maintain ±3.5% total output error over –40°C to 125°C and supports rail-to-rail output swing (to within 150 mV of Vs and 4 mV of GND). The 1.2-V REF OUT pin is available only on 14-pin packages and delivers ±12 mV initial accuracy with ≤100 ppm/°C drift.

Key Specifications

Pinout & Package

INA208AID is packaged in SO-14 (8.65 mm × 3.91 mm) and TSSOP-14 (5.00 mm × 4.40 mm) variants. Both share identical pin functions and are RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA208AID, INA209AIDR adds digital communication but removes standalone analog fault signaling, while MAX4372TESD+ reduces integration at the cost of requiring external components for protection - making INA208AID optimal for self-contained, hardware-based overcurrent response.

Availability

INA208AID is available at Aetrix Electronics and suitable for server power management, automotive battery chargers, and telecom DC distribution systems requiring stable component supply, long-term lifecycle support, and guaranteed traceability.

Supply support for INA208AID 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-reliability current monitoring in power-constrained, high-common-mode environments - targeting telecom infrastructure, industrial automation, and automotive electrification applications.

FAQ

What is the maximum common-mode voltage supported by the INA208AID?

The INA208AID supports a common-mode input voltage range of –16 V to 80 V, as specified in the absolute maximum ratings and recommended operating conditions of TI SBOS360F. This allows direct high-side shunt monitoring in 48-V telecom systems and 60-V automotive subsystems without external level-shifting circuitry. The device maintains specified accuracy across this full range when used within its thermal and supply constraints.

Does the INA208AID require external components to operate its comparators?

No - the INA208AID includes internal 0.6-V references for both comparators and a 1.2-V reference output on pin 12. External components are only required for specific functions: a pull-up resistor on CMP1 OUT/CMP2 OUT (typically 4.7 kΩ to VS), and a capacitor on CMP2 DELAY (e.g., 0.1 µF for 0.5 s delay). No external reference or hysteresis resistors are needed for basic operation.

Can the INA208AID be used with a 3.3-V supply?

Yes - the INA208AID operates from 2.7 V to 18 V, so 3.3 V is within its valid supply range. However, output swing is limited to within 150 mV of VS and 4 mV of GND; thus, with 3.3 V supply, the maximum usable output is ~3.15 V. For 100 V/V gain, this limits full-scale sense voltage to 31.5 mV. Ensure shunt selection and comparator thresholds align with this reduced headroom.

How does the CMP2 DELAY function work on the INA208AID?

The CMP2 DELAY pin connects to an internal current source that charges an external capacitor; delay time t_D = 5 × C_DELAY (in µF). For example, a 0.1 µF capacitor yields 0.5 s delay on both rising and falling edges of CMP2 OUT, as confirmed in SBOS360F Section 7.6 and Figure 30. This delay is applied symmetrically and cannot be disabled - leaving the pin unconnected results in minimal delay (~ns).

Is the 1.2-V reference output available on all INA208AID package variants?

No - the 1.2-V REF OUT (pin 12) is available only on the 14-pin SOIC (D) and TSSOP (PW) packages. It is not present on the VSSOP-10 (DGS) variant, which omits pins 3, 6, 9, 12, and 13. Designers selecting the VSSOP-10 must implement external references if comparator threshold stability is required beyond the internal 0.6-V nodes.