Texas Instruments INA293A5IDBVT

Overview

INA293A5IDBVT from Texas Instruments is an ultra-precise current sense amplifier designed for high-side or low-side shunt monitoring in 48-V power systems, featuring 500 V/V fixed gain, −4 V to +110 V common-mode input range, 1.3 MHz bandwidth, ±0.15% max gain error, and ±2 µV max input offset voltage (typical ±15 µV). It enables accurate recirculating current measurement in half-bridge motor drives and fast overcurrent protection in telecom PSUs.

For engineers reviewing the INA293A5IDBVT datasheet, INA293A5IDBVT pinout, INA293A5IDBVT application, or INA293A5IDBVT equivalent, key selection criteria include its 500 V/V gain optimized for low V_SENSE (e.g., ≤10 mV full-scale), −4 V negative common-mode capability, 2.5 V/µs slew rate for sub-2 µs overcurrent response, and SOT-23-5 package compatibility with space-constrained 48-V BMS and RRU designs.

Technical Context

The INA293A5IDBVT employs a transconductance architecture with current-feedback amplifier topology, enabling 20 µA typical input bias current at 110 V common-mode while maintaining ultra-low offset drift (±0.025 µV/°C). Its zero-drift input stage ensures stable DC accuracy across −40°C to +125°C, critical for battery management and server PSU calibration.

Unlike conventional current-sense amplifiers, the device decouples common-mode range (−4 V to +110 V) from supply voltage (2.7 V to 20 V), allowing operation below ground in half-bridge recirculation paths and supporting unidirectional sensing only. Its 500 V/V gain variant delivers 10 mV input-to-5 V output scaling, minimizing shunt power loss in high-current 48-V applications.

Key Specifications

Pinout & Package

SOT-23-5 (DBV) package, 2.90 mm × 1.60 mm body size, 0.95 mm height, 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 INA293A5IDBVT, INA240A5IDR offers automotive qualification but sacrifices 48-V system flexibility due to limited supply range and no negative common-mode capability, while MAX40056ASA+T provides higher DC CMRR but requires additional circuitry for 48-V high-side implementation and lacks transient survivability.

Availability

INA293A5IDBVT is available at Aetrix Electronics and suitable for 48-V rack server power monitoring, macro RRU overcurrent protection, and 48-V battery management systems requiring stable component supply across extended temperature and high-reliability production cycles.

Supply support for INA293A5IDBVT 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 specializing in analog and embedded processing technologies, with leadership in precision signal chain and power management ICs.

The INA293 product line delivers ultra-precise current sensing for high-voltage industrial and telecom power systems, specifically engineered to replace discrete op-amp solutions in 48-V infrastructure where common-mode resilience, DC accuracy, and fast transient response are critical.

FAQ

What is the maximum common-mode voltage the INA293A5IDBVT can withstand continuously?

The INA293A5IDBVT operates continuously over a common-mode input range of −4 V to +110 V. Its survival rating extends to −20 V to +120 V, meaning it can tolerate short-duration transients such as load dumps or ESD events within that range without damage. This makes INA293A5IDBVT suitable for 48-V telecom systems with high-voltage spikes and half-bridge motor control where recirculating currents dip below ground.

Does the INA293A5IDBVT support bidirectional current sensing?

No, the INA293A5IDBVT operates in unidirectional mode only, as confirmed in Section 7.4.1 of the datasheet. It measures current flowing from power supply to load and cannot resolve direction reversal. For bidirectional applications, external circuitry (e.g., level-shifting or dual-amplifier configurations) is required. The INA293A5IDBVT's architecture is optimized for high-accuracy unidirectional monitoring in 48-V PSUs and RRUs.

What is the minimum shunt resistor value compatible with INA293A5IDBVT at 10-A full-scale current?

With its 500 V/V gain and 5-V output full-scale, the INA293A5IDBVT requires a 10-mV differential input at 10 A, corresponding to a 1-mΩ shunt resistor (R = V_SENSE/I = 0.01 V / 10 A). Table 8-1 in the datasheet explicitly lists 1 mΩ for INA293A5 devices at 10-A full scale. This value balances low I²R loss (0.1 W) with sufficient signal-to-noise ratio for precision measurement.

How does the INA293A5IDBVT achieve 900-kHz bandwidth despite its 500 V/V gain?

The INA293A5IDBVT uses a multistage transconductance architecture with current-feedback amplifier topology, which decouples gain-setting from dominant-pole frequency compensation. Unlike voltage-feedback amplifiers, this design maintains high bandwidth across all gain options-900 kHz for INA293A5IDBVT versus 1.3 MHz for lower-gain variants-enabling fast overcurrent response even at maximum gain.

Can INA293A5IDBVT operate from a 3.3-V supply while maintaining full performance?

Yes, the INA293A5IDBVT operates from 2.7 V to 20 V per Section 6.3. At 3.3 V, its output swing is limited to GND + 5 mV to VS − 150 mV (i.e., 3.15 V), and V_SENSE range shrinks proportionally. For 500 V/V gain, maximum usable V_SENSE becomes ~6.2 mV (3.15 V / 500), still sufficient for 6.2-A/1-mΩ sensing. All key specs-including offset, CMRR, and bandwidth-are guaranteed across the full supply range.