Texas Instruments INA293B4IDBVT

Overview

INA293B4IDBVT from Texas Instruments is an ultra-precise current sense amplifier designed for high-side and low-side shunt monitoring in 48-V industrial power systems. It delivers 200 V/V fixed gain, ±5 µV max input offset voltage, 160-dB DC CMRR, and 1.3-MHz bandwidth - enabling accurate, fast-response current measurement in macro remote radio units and server PSUs.

For engineers reviewing the INA293B4IDBVT datasheet, INA293B4IDBVT pinout, INA293B4IDBVT application, or INA293B4IDBVT equivalent, this page provides verified specifications, SOT-23 pin mapping, real-world use cases in 48-V BMS and mMIMO antenna systems, and two validated alternative parts with documented functional differences.

Technical Context

The INA293B4IDBVT uses a transconductance architecture with current-feedback amplification to achieve 20 µA typical input bias current at 110 V common-mode voltage. Its zero-drift topology ensures ±0.025 µV/°C offset drift and <0.15% gain error across –40°C to +125°C.

It operates unidirectionally with –4 V to +110 V common-mode input range independent of supply voltage (2.7 V to 20 V), supporting recirculating current detection in half-bridge topologies via negative common-mode capability.

Key Specifications

Pinout & Package

SOT-23 (DBV) package: 2.90 mm × 1.60 mm body, 5-pin surface-mount, rated for –40°C to +125°C operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA293B4IDBVT, INA240A4QDR trades CMRR and common-mode range for automotive qualification, while MAX40056ATA+T offers higher bandwidth but sacrifices 20 dB CMRR and negative common-mode operation - making INA293B4IDBVT optimal for precision 48-V industrial current sensing where DC accuracy and noise rejection are critical.

Availability

INA293B4IDBVT is available at Aetrix Electronics and suitable for 48-V rack servers, macro remote radio units, and active antenna systems requiring stable component supply throughout product lifecycles.

Supply support for INA293B4IDBVT 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 delivering analog and embedded processing solutions for industrial, automotive, and communications markets.

The INA293 product line delivers ultra-precise current sensing for high-voltage, high-noise power systems - engineered specifically for 48-V infrastructure applications demanding sub-µV offset stability and 160-dB CMRR.

FAQ

What is the maximum common-mode voltage the INA293B4IDBVT can handle during normal operation?

The INA293B4IDBVT operates over a common-mode input range of –4 V to +110 V. This allows it to function correctly in both high-side and low-side configurations on 48-V systems, including scenarios where the shunt sits below ground potential in half-bridge circuits. The device survives up to –20 V and +120 V, but sustained operation outside –4 V to +110 V is not guaranteed per specification.

Does the INA293B4IDBVT support bidirectional current sensing?

No, the INA293B4IDBVT operates in unidirectional mode only. It measures current flowing from power supply to load, as confirmed by its functional block diagram and application schematics. For bidirectional sensing, TI recommends the INA229 or similar devices explicitly specified for dual-direction operation.

What is the typical input bias current of the INA293B4IDBVT at 110 V common-mode voltage?

The INA293B4IDBVT draws 20 µA typical input bias current at 110 V common-mode voltage, as stated in Section 7.3.1.2 of the datasheet. This low bias current minimizes voltage drop errors across high-value shunt resistors and supports precision measurement in high-impedance current-sensing networks used in telecom and server power systems.

Can the INA293B4IDBVT be used with a 3.3-V supply voltage?

Yes, the INA293B4IDBVT operates from 2.7 V to 20 V, so 3.3 V is well within its recommended supply range. At 3.3 V, the output swings to within 70 mV of VS and 5 mV of GND, enabling direct interfacing with 3.3-V ADCs or comparators without level-shifting circuitry.

How does the gain option of the INA293B4IDBVT relate to its part number suffix?

The "B4" in INA293B4IDBVT indicates the B variant pinout (IN+ on pin 4, IN− on pin 5) and 200 V/V gain. Per TI's naming convention, "A1–A5" and "B1–B5" denote five gain options: 20, 50, 100, 200, and 500 V/V. Thus, INA293B4IDBVT is the 200 V/V version in the B-pinout SOT-23 package.