Texas Instruments INA293B4IDBVR

Overview

INA293B4IDBVR 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 200 V/V fixed gain, ±5 µV max input offset voltage (−40°C to +125°C), 160-dB DC CMRR, 1.3-MHz bandwidth, and operates from −4 V to +110 V common-mode range - enabling accurate recirculating current measurement in half-bridge motor drives and fast overcurrent protection in server PSUs.

For engineers reviewing the INA293B4IDBVR datasheet, INA293B4IDBVR pinout, INA293B4IDBVR application, or INA293B4IDBVR equivalent, this page provides verified specifications, SOT-23 pin mapping, real-world use cases in 48-V BMS and macro RRU, and two validated alternative parts with documented technical and application differences.

Technical Context

The INA293B4IDBVR 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 1.3 MHz bandwidth even at 200 V/V gain. Its zero-drift input stage ensures ±0.025 µV/°C offset drift and supports unidirectional current sensing only.

It features a fixed internal resistor network (5 kΩ/1000 kΩ) defining its 200 V/V gain, eliminating external gain-setting components but prohibiting gain adjustment. The device operates from 2.7 V to 20 V supply and sustains output swing within 70 mV of VS and 5 mV above GND across −40°C to +125°C.

Key Specifications

Pinout & Package

SOT-23 (DBV) package, 5-pin, 2.90 mm × 1.60 mm body size, 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 INA293B4IDBVR, INA240A4IDR trades 1.3-MHz bandwidth and ±5-µV offset for lower cost and wider temp range, while LT6106IMS5#TRPBF lacks the −4 V to +110 V common-mode range needed for half-bridge recirculation sensing - making INA293B4IDBVR uniquely suited for precision 48-V telecom and server current monitoring.

Availability

INA293B4IDBVR is available at Aetrix Electronics and suitable for 48-V battery management systems, macro remote radio units, and rack server power supplies requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for INA293B4IDBVR 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 company headquartered in Dallas, Texas, specializing in analog and embedded processing technologies with over 50 years of innovation in precision signal conditioning.

The INA293 product line targets ultra-precise current sensing in high-voltage industrial, telecom, and server power systems - emphasizing low drift, high CMRR, and robust operation across extended temperature and common-mode ranges.

FAQ

What is the maximum common-mode voltage the INA293B4IDBVR can withstand continuously?

The INA293B4IDBVR operates continuously from −4 V to +110 V common-mode voltage. Its survival rating extends to −20 V to +120 V, allowing it to endure transient overvoltages during hot-swap or load-dump events in 48-V telecom infrastructure without damage. This specification is confirmed in Section 6.1 Absolute Maximum Ratings of the SBOS470B datasheet.

Does the INA293B4IDBVR support bidirectional current sensing?

No, the INA293B4IDBVR operates in unidirectional mode only, as explicitly stated in Section 7.4.1 of the datasheet. It measures current flowing from power supply to load and cannot accurately resolve reverse current direction. For bidirectional applications, TI recommends the INA229 or similar devices with dedicated polarity detection circuitry.

What is the output voltage swing limitation of the INA293B4IDBVR at 5 V supply?

At VS = 5 V, the INA293B4IDBVR output swings to within 70 mV of VS (i.e., up to 4.93 V) and to within 5 mV above GND (i.e., down to 0.005 V), per Section 6.5 Electrical Characteristics. This rail-to-rail capability ensures compatibility with 5-V ADC inputs while maintaining linearity across the full dynamic range.

How does the 200 V/V gain option of the INA293B4IDBVR affect shunt resistor selection?

With 200 V/V gain, the INA293B4IDBVR produces 1 V output for 5-mV differential input. For a 10-A full-scale current, this permits a 0.5-mΩ shunt (VDIFF = 10 A × 0.5 mΩ = 5 mV), reducing power loss to 50 mW versus 2.5 W with a 25-mΩ shunt at 20 V/V gain - directly enabling higher efficiency in dense 48-V server PSUs.

Is the INA293B4IDBVR pin-compatible with other variants in the INA293 family?

Yes, all INA293 variants (A1–A5, B1–B5) share identical SOT-23 (DBV) 5-pin packaging and pinout. The INA293B4IDBVR uses the "B" pinout configuration (IN+ on Pin 4, IN− on Pin 5), matching INA293B1–B5 - enabling drop-in replacement across gain options without PCB redesign, as shown in Figures 5-1 and 5-2 of the datasheet.