Texas Instruments INA293B2QDBVRQ1

Overview

INA293B2QDBVRQ1 from Texas Instruments is an AEC-Q100 Grade 1 ultra-precise current sense amplifier for automotive high-side and low-side shunt monitoring, featuring 50 V/V fixed gain, −4 V to +110 V common-mode input range, ±15 µV typical offset voltage, ±0.15% max gain error, and 1.3 MHz bandwidth. It enables accurate recirculating current measurement in half-bridge solenoid and valve control.

For engineers reviewing the INA293B2QDBVRQ1 datasheet, INA293B2QDBVRQ1 pinout, INA293B2QDBVRQ1 application, or INA293B2QDBVRQ1 equivalent, key selection criteria include common-mode survival voltage (−20 V to +120 V), AC CMRR at 50 kHz (85 dB), quiescent current (1.5 mA), output swing to ground (≤20 mV), and SOT-23 package thermal resistance (R_θJA = 184.7 °C/W).

Technical Context

The INA293B2QDBVRQ1 uses a transconductance architecture with current-feedback amplifier topology, enabling 20 µA typical input bias current at 110 V common-mode and supporting unidirectional current sensing only. Its zero-drift input stage delivers ±0.05 µV/°C offset drift and 160-dB DC CMRR over −40 °C to +125 °C.

Unlike conventional current sense amplifiers, it operates independently of supply voltage for common-mode range - functional from −4 V to +110 V regardless of 2.7 V–20 V V_S. The fixed 50 V/V gain is set by internal laser-trimmed resistor networks (10 kΩ/500 kΩ), eliminating external gain-setting components and ensuring <10 ppm/°C gain drift.

Key Specifications

Pinout & Package

SOT-23 (DBV) package, 5-pin, 2.90 mm × 1.60 mm body size, with exposed pad not connected internally. Thermal resistance R_θJA = 184.7 °C/W (JEDEC standard board).

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA240A2QDRQ1 and MAX40056ATA+T, the INA293B2QDBVRQ1 uniquely combines AEC-Q100 Grade 1 qualification, −4 V common-mode capability, 1.3-MHz bandwidth, and ±15-µV offset - making it the only option qualified for ASIL-B solenoid/valve control with fast fault response and precision low-current measurement.

Availability

INA293B2QDBVRQ1 is available at Aetrix Electronics and suitable for 48-V automotive battery management, solenoid control feedback, and valve actuator current protection requiring stable component supply across automotive production lifecycles.

Supply support for INA293B2QDBVRQ1 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 analog ICs and automotive-grade solutions.

The INA293-Q1 product line delivers ultra-precise, AEC-Q100-qualified current sensing for next-generation 48-V automotive subsystems - designed specifically for high-speed, high-accuracy shunt monitoring in solenoid, valve, and DC/DC converter applications.

FAQ

What is the maximum common-mode voltage the INA293B2QDBVRQ1 can withstand without damage?

The INA293B2QDBVRQ1 has a survival common-mode voltage rating of −20 V to +120 V per AEC-Q100 stress testing. This allows it to endure load-dump transients and negative recirculation events in automotive half-bridge circuits without latch-up or permanent degradation. Its operational common-mode range remains −4 V to +110 V across the full temperature range. The INA293B2QDBVRQ1 maintains specified performance within this operational window while surviving brief excursions beyond it.

Does the INA293B2QDBVRQ1 support bidirectional current sensing?

No, the INA293B2QDBVRQ1 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 accurately resolve reverse current flow. For bidirectional applications, TI recommends the INA229-Q1 or similar devices. The INA293B2QDBVRQ1's architecture and pinout are optimized for single-direction precision, with zero-current output voltage specified as GND + 20 mV maximum.

What is the output voltage swing limitation of the INA293B2QDBVRQ1 at 125 °C?

At +125 °C and 5-V supply, the INA293B2QDBVRQ1 output swings to within 20 mV of GND and 150 mV of V_S, per Electrical Characteristics Table 6.5. This means minimum output is ≥0.02 V and maximum is ≤4.85 V. These limits ensure linear operation across automotive temperature extremes and directly constrain usable shunt voltage range - for example, with 50× gain, maximum valid V_SENSE is 97 mV at 125 °C. The INA293B2QDBVRQ1 datasheet specifies these values under "Swing to ground" and "Swing to Vs" parameters.

Can the INA293B2QDBVRQ1 be used with a 24-V supply rail?

Yes, the INA293B2QDBVRQ1 supports supply voltages from 2.7 V to 20 V, so a 24-V supply is outside its absolute maximum rating (V_S max = 22 V). Operating at 24 V risks permanent damage. For 24-V systems, use a regulated 12-V or 15-V LDO to power the INA293B2QDBVRQ1 while maintaining its full −4 V to +110 V common-mode input capability. The INA293B2QDBVRQ1's V_S independence from V_CM means its input range remains fully functional even with reduced supply voltage.

How does the gain option (B2) map to the internal resistor network in the INA293B2QDBVRQ1?

The "B2" suffix denotes the 50 V/V gain variant, implemented via internal laser-trimmed resistors: R1 = 10 kΩ and R_L = 500 kΩ, as specified in Table 7-1 of the datasheet. This fixed-ratio network ensures <0.15% gain error and <10 ppm/°C drift - no external components are needed or recommended. Modifying gain externally degrades accuracy due to resistor mismatch and layout parasitics. The INA293B2QDBVRQ1's gain is factory-set and invariant across temperature, supply, and common-mode voltage.