Texas Instruments INA293A4IDBVR

Overview

INA293A4IDBVR 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, 160-dB DC CMRR, −4 V to +110 V common-mode range, and 900 kHz bandwidth-enabling accurate, fast-response current measurement in macro remote radio units and rack server PSUs.

For engineers reviewing the INA293A4IDBVR datasheet, INA293A4IDBVR pinout, INA293A4IDBVR application, or INA293A4IDBVR equivalent, key selection criteria include its 200 V/V gain accuracy (±0.15% max), sub-0.03 µV/°C offset drift, survival up to +120 V common-mode, SOT-23-5 package compatibility with space-constrained BMS and RRU layouts, and unidirectional sensing capability for overcurrent protection timing.

Technical Context

The INA293A4IDBVR employs 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 across −40°C to +125°C, while internal precision resistor networks fix gain at 200 V/V without external components.

This variant supports unidirectional current sensing only, with output swing limited to GND + 20 mV (min) and VS − 0.15 V (max) under full temperature range. Its 900 kHz bandwidth and 2.5 V/µs slew rate are optimized for fast overcurrent detection-e.g., responding in <2 µs to a 75-A transient on a 2-mΩ shunt at 5 V supply.

Key Specifications

Pinout & Package

SOT-23-5 (DBV) package: 2.90 mm × 1.60 mm body, 0.95 mm height, gull-wing leads; 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 INA240A4IDR and MAX40056ASA+, the INA293A4IDBVR provides superior DC precision (±5 µV vs ≥±50 µV), extended common-mode range (−4 V to +110 V vs ≤+80 V), and higher CMRR (160 dB vs ≤120 dB), making it uniquely suitable for high-reliability 48-V telecom and server power monitoring where measurement integrity under extreme voltage stress is mandatory.

Availability

INA293A4IDBVR is available at Aetrix Electronics and suitable for macro remote radio units, 48-V rack server power supplies, and battery management systems requiring stable component supply across extended temperature and voltage stress conditions.

Supply support for INA293A4IDBVR 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 amplifiers and power management ICs.

The INA293 product line targets ultra-precise current sensing in high-voltage industrial, telecom, and server power systems-designed specifically for applications demanding sub-µV offset stability, >150-dB CMRR, and operation beyond standard supply rails.

FAQ

What is the maximum common-mode voltage the INA293A4IDBVR can withstand continuously?

The INA293A4IDBVR 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 or latch-up. This makes the INA293A4IDBVR suitable for 48-V telecom infrastructure where voltage spikes exceed nominal rail levels. Always verify layout grounding and input filtering per TI's SBOS470B layout guidelines when operating near absolute maximums.

Does the INA293A4IDBVR support bidirectional current sensing?

No, the INA293A4IDBVR is specified for unidirectional current sensing only-it measures current flowing from power supply to load, not reverse flow. Its output voltage remains near GND under zero-current conditions (≤20 mV), and it lacks internal circuitry to resolve polarity reversal. For bidirectional applications like regenerative braking or battery charge/discharge monitoring, designers must use external level-shifting or select a purpose-built bidirectional amplifier such as the INA229. The INA293A4IDBVR datasheet explicitly states unidirectional operation in Section 7.4.1.

What is the typical input bias current of the INA293A4IDBVR at 48 V common-mode voltage?

The INA293A4IDBVR exhibits 20 µA typical input bias current at 48 V common-mode voltage, as confirmed in Section 6.5 Electrical Characteristics of the SBOS470B datasheet. This value remains stable across temperature (−40°C to +125°C) and supply voltage (2.7 V to 20 V), enabling accurate current measurement with high-value shunts without significant error contribution. At 110 V common-mode, bias current rises slightly but stays within 30 µA maximum-critical for minimizing offset in precision 48-V BMS designs using low-power shunts.

Can the INA293A4IDBVR drive a 10-kΩ load while maintaining specified accuracy?

Yes, the INA293A4IDBVR is fully characterized driving a 10-kΩ load, as stated in Section 6.5 "Voltage Output" specifications. Its output swing is guaranteed to reach within 20 mV of GND and 0.15 V of VS under those conditions across −40°C to +125°C. Driving heavier capacitive loads (>500 pF) may cause instability, so TI recommends limiting output capacitance and avoiding long PCB traces directly at the OUT pin. For ADC interfacing, a series resistor (e.g., 10 Ω) between OUT and ADC input is advised to isolate capacitance without degrading bandwidth.

How does the gain error of the INA293A4IDBVR vary with temperature?

The INA293A4IDBVR has a maximum gain error of ±0.15% at room temperature and ±1% over the full −40°C to +125°C range, with a worst-case drift of ±10 ppm/°C. Figure 6-10 in the SBOS470B datasheet shows measured gain error remains within ±0.05% across temperature for most units. This tight drift ensures consistent scaling of shunt voltage to output-critical in closed-loop power supply control where gain variation could destabilize regulation. The internal laser-trimmed resistor network eliminates need for external calibration in production systems using the INA293A4IDBVR.