Texas Instruments OPA322AQDBVRQ1

Overview

OPA322AQDBVRQ1 from Texas Instruments is an automotive-grade, single-channel CMOS operational amplifier optimized for low-noise, rail-to-rail input/output signal conditioning in 1.8-V to 5.5-V single-supply systems. It delivers 20-MHz gain bandwidth, 10-V/μs slew rate, and 8.5-nV/√Hz input voltage noise at 1 kHz - enabling high-fidelity sensor amplification and audio front-end stages in vehicle cabin control modules.

For engineers reviewing the OPA322AQDBVRQ1 datasheet, OPA322AQDBVRQ1 pinout, OPA322AQDBVRQ1 application, or OPA322AQDBVRQ1 equivalent, key selection criteria include its AEC-Q100 Grade 1 qualification (–40°C to +125°C), 2-mV max offset voltage, 1.6-mA/ch quiescent current, and SOT-23-5 package compatibility with space-constrained automotive PCB layouts.

Technical Context

The OPA322AQDBVRQ1 employs a zero-crossover rail-to-rail input stage that eliminates distortion across the full common-mode range (V– – 0.1 V to V+ + 0.1 V), ensuring linearity in precision sensor interfaces. Its CMOS input architecture achieves ultra-low input bias current (±0.2 pA typ at 25°C) and high open-loop gain (100 dB min), supporting stable closed-loop operation at unity gain.

Internally compensated for unity-gain stability with 50-pF capacitive load drive capability, it maintains 47° phase margin and settles to 0.1% in 0.25 μs. The device operates across 1.8–5.5 V supply while delivering rail-to-rail output swing within 10 mV of each rail at 25°C (30 mV over full temperature range).

Key Specifications

Pinout & Package

OPA322AQDBVRQ1 is housed in a 5-pin SOT-23 (DBV) package measuring 2.90 mm × 1.60 mm, optimized for automated placement and thermal performance (R_θJA = 219.3°C/W). The compact footprint supports high-density automotive PCBs while maintaining adequate power dissipation for 1.6-mA/channel operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LMV321Q1MG/NOPB and TSV911IQDBVRQ1, OPA322AQDBVRQ1 uniquely balances 20-MHz bandwidth, 8.5-nV/√Hz noise, and AEC-Q100 Grade 1 reliability - making it the sole option among the three for automotive sensor front-ends demanding both speed and precision.

Availability

OPA322AQDBVRQ1 is available at Aetrix Electronics and suitable for automotive cabin control, sensor signal conditioning, and consumer audio applications requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for OPA322AQDBVRQ1 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 specializing in analog and embedded processing technologies, with decades of automotive IC design expertise and rigorous AEC-Q100 validation infrastructure.

The OPAx322-Q1 product line was engineered specifically for high-accuracy, low-noise signal conditioning in automotive subsystems - targeting sensor interfaces, audio preamps, and control-loop amplifiers operating from 1.8-V single supplies.

FAQ

What automotive temperature grade does OPA322AQDBVRQ1 support?

OPA322AQDBVRQ1 is qualified to AEC-Q100 Grade 1, supporting continuous operation from –40°C to +125°C ambient temperature. This rating covers under-hood and cabin-mounted applications including HVAC sensors, seat occupancy detection, and infotainment audio circuits where thermal robustness is mandatory. The device's electrical specifications are fully guaranteed across this full range.

Does OPA322AQDBVRQ1 require external compensation for unity-gain stability?

No, OPA322AQDBVRQ1 is internally compensated and unity-gain stable up to 50-pF capacitive load. It maintains 47° phase margin under these conditions, eliminating the need for external compensation networks in buffer, follower, or active filter configurations - simplifying layout and reducing bill-of-materials cost in automotive designs.

What is the maximum output voltage swing for OPA322AQDBVRQ1 at 5.5-V supply?

At 5.5-V supply and 25°C, OPA322AQDBVRQ1 delivers rail-to-rail output swing within 10 mV of each rail into a 10-kΩ load. Over the full –40°C to +125°C range, the swing degrades to within 30 mV of the rails - enabling full utilization of 12-bit ADC reference spans (e.g., 0–5.5 V) without clipping in automotive sensor interfaces.

How does the zero-crossover input stage in OPA322AQDBVRQ1 improve performance?

The zero-crossover rail-to-rail input stage in OPA322AQDBVRQ1 eliminates crossover distortion inherent in conventional Class-AB input stages, ensuring continuous transconductance across the entire common-mode range (V– – 0.1 V to V+ + 0.1 V). This preserves THD+N at 0.0005% and enables accurate amplification of low-amplitude signals near supply rails - critical for single-supply automotive sensor conditioning.

Can OPA322AQDBVRQ1 drive capacitive loads typical of automotive PCB traces?

Yes, OPA322AQDBVRQ1 is characterized to drive up to 50-pF capacitive loads while maintaining stability and 0.1% settling in 0.25 μs. This accommodates typical automotive PCB trace capacitance (5–20 pF) plus connector and ADC input capacitance without external isolation resistors - simplifying interconnect design in distributed vehicle control modules.