Texas Instruments INA293B4QDBVRQ1

Overview

INA293B4QDBVRQ1 from Texas Instruments is an AEC-Q100 Grade 1 (–40 °C to +125 °C) ultra-precise current sense amplifier optimized for high-side and low-side shunt monitoring in automotive 48-V systems. It delivers 200 V/V fixed gain, ±5 µV max input offset voltage, 160-dB DC CMRR, 1.3-MHz bandwidth, and operates from –4 V to +110 V common-mode range - enabling accurate recirculating current measurement in half-bridge solenoid and valve control.

For engineers reviewing the INA293B4QDBVRQ1 datasheet, INA293B4QDBVRQ1 pinout, INA293B4QDBVRQ1 application, or INA293B4QDBVRQ1 equivalent, key selection criteria include its 200 V/V gain accuracy (±0.15% max), negative common-mode capability down to –4 V, functional safety documentation support, and SOT-23-5 package compatibility with space-constrained automotive PCB layouts.

Technical Context

The INA293B4QDBVRQ1 employs 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. Its zero-drift input stage achieves ±0.025 µV/°C offset drift and maintains 140–160 dB DC CMRR across –40 °C to +125 °C.

This variant is specifically configured for 200 V/V gain via internal precision resistor network (R1 = 5 kΩ, RL = 1000 kΩ), delivering 900 kHz bandwidth at full-scale VSENSE and 2.5 V/µs slew rate - enabling sub-2 µs overcurrent response in 48-V DC/DC converter protection circuits.

Key Specifications

Pinout & Package

SOT-23-5 (DBV) package, 2.90 mm × 1.60 mm body size, 0.95-mm maximum height, with gull-wing leads and thermal pad not present.

Key Features

Applications

Equivalent & Alternatives

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

Compared with INA293B4QDBVRQ1, INA240A4QDRQ1 trades 40-dB lower CMRR and no negative common-mode for lower quiescent current (700 µA), while MAX40088AUB+T offers tighter offset but fails AEC-Q100 Grade 1 and cannot measure below-ground currents - making INA293B4QDBVRQ1 the sole choice for ASIL-B half-bridge solenoid control.

Availability

INA293B4QDBVRQ1 is available at Aetrix Electronics and suitable for 48-V automotive power distribution, solenoid control, and DC/DC converter protection requiring stable component supply across extended temperature and long production lifecycles.

Supply support for INA293B4QDBVRQ1 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 automotive-grade signal conditioning and power management ICs.

The INA293-Q1 product line delivers ultra-precise, AEC-Q100-qualified current sensing for safety-critical automotive subsystems - designed specifically to replace discrete op-amp solutions in 48-V mild-hybrid, brake-by-wire, and electric power steering applications.

FAQ

What is the maximum common-mode voltage the INA293B4QDBVRQ1 can withstand during transient conditions?

The INA293B4QDBVRQ1 has a survival common-mode voltage rating of –20 V to +120 V per absolute maximum specifications. This allows it to safely endure automotive load-dump transients up to +120 V and cold-crank negative spikes down to –20 V without damage, though continuous operation must remain within –4 V to +110 V. The device's internal architecture isolates input stage biasing from supply rails, enabling this robustness independent of VS voltage.

Does the INA293B4QDBVRQ1 support bidirectional current measurement?

No, the INA293B4QDBVRQ1 operates in unidirectional mode only, as confirmed in Section 7.4.1 of the datasheet. It measures current flowing from power supply to load (positive direction only). However, its –4 V to +110 V common-mode range enables accurate measurement of recirculating current during PWM off-times in half-bridge topologies - a key capability for solenoid and motor control, even though net current flow remains unidirectional.

What is the output swing limitation of the INA293B4QDBVRQ1 at 125 °C ambient?

At TA = +125 °C and VS = 5 V, the INA293B4QDBVRQ1 output swings from GND + 20 mV minimum to VS – 150 mV maximum under 10-kΩ load, per Electrical Characteristics Table 6.5. This 4.83-V dynamic range at full temperature ensures reliable interface with 5-V ADCs and comparators without level-shifting, preserving measurement fidelity in under-hood environments.

How does the 200 V/V gain option of the INA293B4QDBVRQ1 affect bandwidth and noise performance?

The INA293B4QDBVRQ1's 200 V/V gain version delivers 900 kHz bandwidth (vs 1.3 MHz for 20 V/V) and maintains 50 nV/√Hz input-referred voltage noise density. The reduced bandwidth results from internal compensation for stability at higher gains, while the noise floor remains unchanged because it is dominated by the input-stage transconductance amplifier - not gain-setting resistors. This makes it optimal for 48-V systems using 2–5 mΩ shunts where SNR > 70 dB is required.

Is the INA293B4QDBVRQ1 pin-compatible with other variants in the INA293-Q1 family?

Yes, all INA293-Q1 variants - including INA293A4QDBVRQ1 and INA293B4QDBVRQ1 - share identical SOT-23-5 (DBV) packaging and pinout. The "A" and "B" suffixes denote different internal pin configurations: INA293B-Q1 places VS on Pin 3 and IN+ on Pin 4, while INA293A-Q1 swaps these. The INA293B4QDBVRQ1 uses the B-pinout (VS=Pin3, IN+=Pin4), ensuring mechanical compatibility but requiring correct schematic placement to match routing.