Texas Instruments INA293B5IDBVR

Overview

INA293B5IDBVR 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 500 V/V fixed gain, ±0.15% max gain error, ±2 µV max input offset voltage (typical ±15 µV), and operates across –4 V to +110 V common-mode range with 1.3 MHz bandwidth - enabling accurate, fast overcurrent detection in server PSU and BMS applications.

For engineers reviewing the INA293B5IDBVR datasheet, INA293B5IDBVR pinout, INA293B5IDBVR application, or INA293B5IDBVR equivalent, key selection criteria include its 500 V/V gain optimized for low V_SENSE (e.g., ≤10 mV full-scale), –4 V to 110 V common-mode operation below ground, 160-dB DC CMRR, and SOT-23-5 package compatibility with space-constrained 48-V rack designs.

Technical Context

The INA293B5IDBVR uses a transconductance architecture with current-feedback amplifier topology, enabling 20 µA typical input bias current at 110 V common-mode and supporting recirculating current measurement in half-bridge configurations. Its zero-drift input stage ensures ±0.025 µV/°C max offset drift and <0.1% nonlinearity error over –40°C to +125°C.

This variant implements a precision internal resistor network (2 kΩ/1000 kΩ) to fix gain at 500 V/V - eliminating external gain-setting components while maintaining ±10 ppm/°C max gain drift. The device achieves 900 kHz bandwidth at 5 pF load with 8 mV differential input, and sustains 2.5 V/µs slew rate for sub-2 µs response to 75-A overcurrent events on 2-mΩ shunts.

Key Specifications

Pinout & Package

SOT-23-5 (DBV) package, 2.90 mm × 1.60 mm body size, with exposed pad not electrically connected. Pinout follows INA293B configuration per TI SBOS470B Rev B.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA293B5IDBVR, INA296B5IDBVR offers superior CMRR and drift for mission-critical 48-V infrastructure, while MAX40056ASA+T trades precision for broader vendor availability at lower cost - neither is pin-compatible without layout revision.

Availability

INA293B5IDBVR is available at Aetrix Electronics and suitable for 48-V rack server power monitoring, macro remote radio unit (RRU) protection, and active antenna system (mMIMO) current telemetry requiring stable component supply across extended temperature and high-reliability production cycles.

Supply support for INA293B5IDBVR 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 INA293 product line was engineered specifically for ultra-precise, high-bandwidth current sensing in next-generation 48-V power architectures - targeting telecom infrastructure, data center servers, and industrial battery systems demanding sub-µV offset stability and 1-MHz+ response.

FAQ

What is the maximum common-mode voltage the INA293B5IDBVR can withstand continuously?

The INA293B5IDBVR supports continuous operation from –4 V to +110 V common-mode voltage. Its survival rating extends to –20 V to +120 V, allowing tolerance of short-duration transients such as load dump or hot-swap events without damage. This range enables direct connection to 48-V bus rails and compatibility with negative-rail half-bridge topologies where current recirculates below ground.

Does the INA293B5IDBVR support bidirectional current sensing?

The INA293B5IDBVR is specified for unidirectional operation only, measuring current flowing from supply to load. While its –4 V common-mode capability allows sensing of recirculating currents in half-bridge configurations, it does not provide true bidirectional output polarity reversal. For bidirectional applications, external circuitry (e.g., level-shifting or differential ADC) is required - the device itself outputs only positive voltages proportional to forward current magnitude.

What is the minimum shunt resistor value usable with INA293B5IDBVR at full-scale 10-A current?

With 500 V/V gain and 5-V full-scale output, the INA293B5IDBVR requires 10 mV differential input at 10 A, corresponding to a 1-mΩ shunt resistor. This value is validated in TI's Table 8-1 and supported by the device's 900-kHz bandwidth and <0.01% nonlinearity at 8 mV - ensuring accuracy without calibration while minimizing I²R losses in high-current 48-V distribution paths.

How does the INA293B5IDBVR achieve 160-dB DC CMRR with a 500 V/V gain?

The INA293B5IDBVR achieves 160-dB DC CMRR through a precision zero-drift input stage combined with tightly matched internal resistor networks and proprietary current-feedback amplifier topology. Unlike conventional op-amp-based current sense amplifiers, its transconductance architecture inherently suppresses common-mode errors across the full –4 V to +110 V range, verified in TI SBOS470B Figure 6-7 and Table 6-5.

Is the SOT-23-5 package of INA293B5IDBVR thermally adequate for 1.5 mA quiescent current in sealed enclosures?

Yes - the INA293B5IDBVR in DBV (SOT-23-5) package has a junction-to-board thermal resistance (R_θJB) of 47.2°C/W. At 1.5 mA quiescent current and 5 V supply (7.5 mW dissipation), self-heating adds <0.4°C rise above board temperature. This is well within the –40°C to +125°C operating range, even in sealed industrial enclosures with limited airflow, as confirmed in TI's Thermal Information section (Table 6-4).