Texas Instruments INA293A3IDBVT

Overview

INA293A3IDBVT 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 100 V/V fixed gain, ±0.15% max gain error, ±10 µV max input offset voltage, and operates across –4 V to +110 V common-mode range with 1.3 MHz bandwidth-enabling accurate, fast overcurrent detection in macro remote radio units and rack server PSUs.

For engineers reviewing the INA293A3IDBVT datasheet, INA293A3IDBVT pinout, INA293A3IDBVT application, or INA293A3IDBVT equivalent, key selection criteria include its 100 V/V gain accuracy at ±10 ppm/°C drift, 160-dB DC CMRR, 2.5 V/µs slew rate, and SOT-23-5 package compatibility with space-constrained 48-V BMS and active antenna system designs.

Technical Context

The INA293A3IDBVT uses a transconductance architecture with current-feedback amplifier topology, enabling 20 µA typical input bias current even at 110 V common-mode voltage. Its zero-drift input stage ensures stable offset performance (±0.05 µV/°C typical) across –40°C to +125°C.

Unlike traditional current sense amplifiers, it decouples common-mode operation from supply voltage: functional V_CM (–4 V to +110 V) exceeds V_S range (2.7 V to 20 V), supporting recirculating current measurement in half-bridge configurations and ground-referenced sensing below 0 V.

Key Specifications

Pinout & Package

SOT-23-5 (DBV) package, 2.90 mm × 1.60 mm body size, surface-mount, lead-free, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA293A3IDBVT, INA296A3IDBVR trades 0.3 MHz bandwidth for tighter offset and drift specs, while MAX40086AUB+T offers higher bandwidth but restricts supply voltage and lacks native –4 V to +110 V V_CM operation-requiring external design effort for 48-V applications.

Availability

INA293A3IDBVT is available at Aetrix Electronics and suitable for 48-V rack server power supplies, macro remote radio units, and active antenna system current monitoring requiring stable component supply, long-lifecycle assurance, and traceable sourcing.

Supply support for INA293A3IDBVT 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, high-bandwidth current sensing for next-generation 48-V infrastructure systems-including telecom RRU, datacenter power, and EV-charging subsystems-where accuracy, speed, and wide common-mode operation are non-negotiable.

FAQ

What is the maximum common-mode voltage the INA293A3IDBVT can handle during normal operation?

The INA293A3IDBVT operates reliably across a common-mode input range of –4 V to +110 V. This specification is validated over the full temperature range (–40°C to +125°C) and enables direct connection to 48-V bus lines with margin for transients. The device survives up to –20 V and +120 V in non-operational conditions, per absolute maximum ratings.

Does the INA293A3IDBVT support bidirectional current sensing?

No, the INA293A3IDBVT operates in unidirectional mode only-it measures current flowing from power supply to load. While its –4 V to +110 V common-mode range supports recirculating current in half-bridge topologies by allowing the IN– pin to go below ground, the output polarity does not invert for reverse current flow. For true bidirectional sensing, a separate device such as the INA2290 is required.

What is the typical input bias current of the INA293A3IDBVT at 48 V common-mode voltage?

At 48 V common-mode voltage and 25°C, the INA293A3IDBVT exhibits 10 µA to 30 µA input bias current on both IN+ and IN– pins, with 20 µA typical. This low bias enables use with high-value shunt resistors without significant measurement error and remains stable across the full V_CM range, as confirmed in Figure 6-13 of the datasheet.

Can the INA293A3IDBVT be used with a 3.3-V supply rail?

Yes, the INA293A3IDBVT supports supply voltages from 2.7 V to 20 V, making it fully compatible with 3.3-V systems. When powered from 3.3 V, its output swings to within 70 mV of V_S and 5 mV of GND, delivering a usable 0–3.23 V output range. Gain, offset, and CMRR remain within datasheet specifications at this supply level.

How does the 100 V/V gain option of the INA293A3IDBVT compare to other variants in terms of bandwidth?

The INA293A3IDBVT (100 V/V) has a typical small-signal bandwidth of 1.0 MHz, as specified in Section 6.5 of the datasheet. This is slightly reduced from the 1.3 MHz bandwidth of the 20 V/V and 50 V/V variants, but remains significantly higher than legacy current sense amplifiers. The trade-off enables optimal dynamic range for mid-range shunt voltages (e.g., 50 mV full-scale), balancing speed and noise performance.