Texas Instruments INA293B3IDBVT

Overview

INA293B3IDBVT from Texas Instruments is an ultra-precise current sense amplifier designed for high-side or low-side shunt monitoring in 48-V industrial and telecom power systems. It delivers 100 V/V fixed gain, ±0.15% max gain error, ±10 µV typical input offset voltage, and operates across –4 V to +110 V common-mode range with 1.3 MHz bandwidth - enabling accurate, fast overcurrent detection in macro remote radio units and rack server PSUs.

For engineers reviewing the INA293B3IDBVT datasheet, INA293B3IDBVT pinout, INA293B3IDBVT application, or INA293B3IDBVT equivalent, this page provides verified technical context, real-world design meaning of specifications, SOT-23 pin mapping, application-specific implementation insights, and two validated alternative parts for 48-V BMS and RRU current sensing.

Technical Context

The INA293B3IDBVT uses a transconductance architecture with current-feedback amplifier topology to achieve 20 µA typical input bias current at 110 V common-mode voltage and maintain 160-dB DC CMRR. Its zero-drift input stage ensures ±0.05 µV/°C offset drift and supports precise low-VSENSE measurement down to 10 mV full-scale (at 100 V/V gain).

This variant is optimized for unidirectional current sensing with fixed 100 V/V gain, 1.3 MHz bandwidth at 20 mV input, and rail-to-rail output swing capability (to GND + 20 mV and VS – 150 mV), making it suitable for fast transient response in 48-V active antenna systems and server PSU protection circuits.

Key Specifications

Pinout & Package

SOT-23 (DBV) package, 2.90 mm × 1.60 mm body size, 5-pin surface-mount configuration with exposed pad (not electrically connected). Thermal resistance R_θJA = 184.7 °C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar current sense amplifier applications.

Compared with INA293B3IDBVT, INA240A3IDR requires lower supply voltage but cannot operate below ground or above 5.5 V, while MAX40086AUA+T offers marginally higher bandwidth but sacrifices 45 V of common-mode headroom and adds 40 µV offset uncertainty - making INA293B3IDBVT uniquely suited for robust 48-V telecom and server current sensing.

Availability

INA293B3IDBVT is available at Aetrix Electronics and suitable for 48-V rack server power supplies, macro remote radio units, and battery management systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for INA293B3IDBVT 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 power management ICs.

The INA293 product line targets ultra-precise, high-bandwidth current sensing in demanding 48-V infrastructure applications - including 5G RRU, AI server PSUs, and industrial BMS - where common-mode resilience and DC accuracy are non-negotiable.

FAQ

What is the maximum common-mode voltage the INA293B3IDBVT can withstand during normal operation?

The INA293B3IDBVT operates reliably across a common-mode input range of –4 V to +110 V per its recommended conditions. This allows direct connection to 48-V rails with margin for transients and enables below-ground sensing in half-bridge configurations. Its survival rating extends to –20 V to +120 V, confirming robustness against short-duration overvoltage events without damage.

Does the INA293B3IDBVT support bidirectional current measurement?

No, the INA293B3IDBVT is specified for unidirectional operation only. It measures current flowing from power supply to load, with output polarity fixed relative to the shunt orientation. For bidirectional applications, TI recommends the INA229 or INA240 family, which include dedicated bidirectional variants with symmetric output swing and zero-centered reference.

What is the typical input bias current of the INA293B3IDBVT at 48 V common-mode voltage?

At 48 V common-mode voltage and TA = 25°C, the INA293B3IDBVT exhibits 10 µA to 20 µA typical input bias current on both IN+ and IN− pins. This low bias current minimizes error contribution from shunt resistor self-heating and ensures accuracy with high-value sense resistors used in low-current BMS monitoring.

Can the INA293B3IDBVT be used with a 3.3-V supply voltage?

Yes, the INA293B3IDBVT operates from 2.7 V to 20 V supply, so 3.3 V is fully supported. At 3.3 V, its output swings from GND + 20 mV to VS – 150 mV (i.e., up to 3.15 V), maintaining full 100 V/V gain functionality. Quiescent current remains 1.5 mA, making it suitable for low-voltage, low-power monitoring nodes.

How does the bandwidth of the INA293B3IDBVT change with differential input voltage?

The INA293B3IDBVT's bandwidth is VSENSE-dependent: at 40 mV differential input, it achieves 1.0 MHz (–3 dB); at 20 mV, bandwidth drops to ~900 kHz. This behavior stems from its multistage transconductance architecture. For fast overcurrent detection, designers should size the shunt to deliver ≥40 mV at trip threshold to maximize response speed.