Texas Instruments INA293B5QDBVRQ1

Overview

INA293B5QDBVRQ1 from Texas Instruments is an AEC-Q100 Grade 1 qualified ultra-precise current sense amplifier for automotive high-side and low-side shunt monitoring, featuring 500 V/V fixed gain, −4 V to +110 V common-mode input range, ±0.15% max gain error, ±2 µV max input offset voltage (typical ±15 µV), and 1.3 MHz bandwidth. It enables accurate recirculating current measurement in half-bridge solenoid and valve drivers.

For engineers reviewing the INA293B5QDBVRQ1 datasheet, INA293B5QDBVRQ1 pinout, INA293B5QDBVRQ1 application, or INA293B5QDBVRQ1 equivalent, this page delivers verified specifications, SOT-23 pin mapping, functional safety documentation support, and validated automotive alternatives - all aligned to production-grade TI SBOS870C revision C data.

Technical Context

The INA293B5QDBVRQ1 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) for bidirectional current detection in half-bridge recirculation paths. Its zero-drift input stage ensures ±0.025 µV/°C typical offset drift over −40 °C to +125 °C.

With 160 dB DC CMRR and 85 dB AC CMRR at 50 kHz, it maintains accuracy under high dv/dt noise conditions in 48-V automotive power stages. The 2.5 V/µs slew rate and <2 µs response time for 75-A threshold detection on 2-mΩ shunts make it suitable for fast overcurrent protection in solenoid and valve control loops.

Key Specifications

Pinout & Package

SOT-23 (DBV) package, 2.90 mm × 1.60 mm body size, 5-pin configuration with exposed pad (not electrically connected). 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 INA293B5QDBVRQ1, INA240A5QDRQ1 trades 40 dB CMRR and 500 kHz bandwidth for lower cost and wider availability, while MAX40056ATA+T offers comparable gain and bandwidth without automotive qualification - making INA293B5QDBVRQ1 the only option meeting ASIL-B-ready, −4-V recirculation, and 160-dB CMRR requirements simultaneously.

Availability

INA293B5QDBVRQ1 is available at Aetrix Electronics and suitable for 48-V automotive power distribution, solenoid control, 48-V DC/DC converter protection, and valve control applications requiring stable component supply, long-term automotive lifecycle support, and traceable AEC-Q100 sourcing.

Supply support for INA293B5QDBVRQ1 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, with deep expertise in precision signal chain and automotive-qualified IC design.

The INA293-Q1 product line was developed specifically for high-reliability automotive current sensing, targeting ASIL-B functional safety compliance, wide common-mode operation in 48-V architectures, and ultra-low drift performance in under-hood environments.

FAQ

What is the maximum common-mode voltage the INA293B5QDBVRQ1 can withstand continuously?

The INA293B5QDBVRQ1 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 withstands transient overvoltage events such as load dump without damage - a critical capability for 48-V automotive systems where rail voltages may surge beyond nominal levels during fault conditions. This specification is validated per AEC-Q100 stress testing protocols.

Does the INA293B5QDBVRQ1 support bidirectional current measurement?

The INA293B5QDBVRQ1 supports unidirectional current sensing only, as confirmed in Section 7.4.1 of the SBOS870C datasheet. However, its −4 V common-mode capability enables measurement of recirculating (negative) current in half-bridge configurations when placed on the low-side shunt - effectively capturing bidirectional energy flow in applications like solenoid flyback or valve PWM release. The device itself does not invert polarity; external signal conditioning is required for true bidirectional interpretation.

What is the typical input offset voltage for INA293B5QDBVRQ1, and how does it impact low-current sensing?

The INA293B5QDBVRQ1 has a typical input offset voltage of ±15 µV and a maximum of ±2 µV (per electrical characteristics table). At 500 V/V gain, this translates to ±7.5 mV output offset error. When measuring current through a 1-mΩ shunt, this allows resolution down to ~7.5 mA with <1% offset-induced error - enabling accurate monitoring of standby currents and small-signal actuator control in automotive ECU subsystems.

Can INA293B5QDBVRQ1 be used with a 3.3-V supply, and what is its output swing limitation?

Yes, INA293B5QDBVRQ1 operates from 2.7 V to 20 V, so 3.3 V is fully supported. With a 3.3-V supply, its output swings to within 70 mV of VS (i.e., up to 3.23 V) and to within 5 mV of GND (i.e., down to 0.005 V), per Section 6.5 Electrical Characteristics. This rail-to-rail capability ensures compatibility with 3.3-V SAR ADCs commonly used in automotive microcontrollers, preserving dynamic range without external level-shifting.

Is functional safety documentation available for INA293B5QDBVRQ1, and what does it include?

Yes, functional safety documentation for INA293B5QDBVRQ1 is publicly available from Texas Instruments and includes FIT rate calculation (126 failures per billion hours), failure mode effect analysis (FMEA), diagnostic coverage metrics, and hardware safety manual guidance. These materials are intended to aid ISO 26262 ASIL-B system-level development and are referenced in the "Functional Safety-Capable" feature bullet of the official datasheet.