Texas Instruments INA293B1IDBVT

Overview

INA293B1IDBVT from Texas Instruments is an ultra-precise current sense amplifier for high-side and low-side shunt monitoring in 48-V power systems, featuring 20 V/V fixed gain, −4 V to +110 V common-mode input range, ±0.15% max gain error, ±15 µV typical offset voltage, and 1.3 MHz bandwidth. It enables accurate recirculating current measurement in half-bridge motor drives and fast overcurrent protection in telecom PSUs.

For engineers reviewing the INA293B1IDBVT datasheet, INA293B1IDBVT pinout, INA293B1IDBVT application, or INA293B1IDBVT equivalent, key selection criteria include common-mode survival at −20 V/+120 V, DC CMRR of 160 dB, 2.5 V/µs slew rate, 1.5 mA quiescent current, and SOT-23 (DBV) package compatibility with space-constrained 48-V BMS and RRU designs.

Technical Context

The INA293B1IDBVT uses a transconductance architecture with current-feedback amplifier topology, enabling 20 µA typical input bias current at 110 V common-mode and supporting operation below ground (−4 V VCM) for bidirectional current analysis in half-bridge configurations. Its zero-drift input stage delivers ±0.05 µV/°C offset drift and maintains <0.1% gain error drift across −40°C to +125°C.

Unlike traditional current sense amplifiers, the INA293B1IDBVT decouples common-mode range from supply voltage - it operates from 2.7 V to 20 V while accepting −4 V to +110 V inputs - and achieves 85 dB AC CMRR at 50 kHz, making it suitable for noisy switch-mode power supply environments where high-frequency interference rejection is critical.

Key Specifications

Pinout & Package

SOT-23 (DBV) 5-pin package, 2.90 mm × 1.60 mm body size, optimized for high-density PCB layouts in telecom and server power modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A1IDR and MAX40056ASA+T, the INA293B1IDBVT uniquely combines −4 V to +110 V common-mode operation, 160-dB DC CMRR, and sub-2-µs overcurrent response - making it the only option qualified for precision half-bridge current reconstruction and fast-fault protection in next-gen 48-V telecom infrastructure.

Availability

INA293B1IDBVT is available at Aetrix Electronics and suitable for 48-V rack server power monitoring, macro remote radio unit (RRU) protection, and active antenna system (AAS) current sensing requiring stable component supply across extended temperature and high-CMRR performance.

Supply support for INA293B1IDBVT 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 targets ultra-precise, high-bandwidth current sensing in 48-V and higher power infrastructure - designed specifically for telecom, server, and renewable energy applications demanding sub-µV offset stability and 110-V common-mode tolerance.

FAQ

What is the maximum common-mode voltage the INA293B1IDBVT can withstand continuously?

The INA293B1IDBVT 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 hot-swap surges in 48-V rack systems without damage or latch-up. This specification is validated across the full −40°C to +125°C temperature range and is independent of the 2.7-V to 20-V supply voltage.

Does the INA293B1IDBVT support bidirectional current sensing?

The INA293B1IDBVT supports unidirectional current sensing by default but enables effective bidirectional analysis in half-bridge topologies due to its −4 V minimum common-mode voltage. When the shunt's negative terminal drops below ground (e.g., during freewheeling), the device accurately measures recirculating current as long as the differential input remains within ±12 V. The INA293B1IDBVT itself does not invert polarity - external signal conditioning is required for true bidirectional output.

What is the output voltage swing limitation of the INA293B1IDBVT at 5-V supply?

At VS = 5 V, the INA293B1IDBVT output swings from GND + 5 mV (minimum) to VS − 150 mV (maximum) under 10-kΩ load and −40°C to +125°C conditions. This 4.85-V usable range supports full-scale 4-V outputs for 200-mV sense voltage applications. Swing performance degrades slightly at temperature extremes: minimum output rises to GND + 20 mV at −40°C, and maximum drops to VS − 200 mV at +125°C.

How does the gain error of the INA293B1IDBVT change over temperature?

The INA293B1IDBVT exhibits ±0.15% maximum gain error at 25°C, with a worst-case drift of ±10 ppm/°C across −40°C to +125°C. This translates to ≤±0.085% additional error over the full range - verified in production testing and reflected in Figure 6-10 of the datasheet. The low drift stems from laser-trimmed thin-film resistors in the internal gain network, eliminating need for system-level gain calibration in most 48-V BMS and PSU applications.

Can the INA293B1IDBVT drive a 500-pF capacitive load directly?

Yes, the INA293B1IDBVT is specified to drive up to 500 pF without sustained oscillation or isolation resistor, as confirmed in Section 6.5 of the datasheet. This capability simplifies anti-aliasing filter design in ADC interfaces - a 10-kΩ series resistor with 500-pF capacitor yields a 32-kHz cutoff, preserving signal integrity for 100-kSPS sampling while maintaining stability. Layout best practices (short traces, local ground plane) are still required to avoid parasitic resonance.