Texas Instruments OPA2333AIDRBR

Overview

OPA2333AIDRBR from Texas Instruments is a dual-channel, zero-drift, rail-to-rail input/output CMOS operational amplifier optimized for precision low-power applications. It delivers 10 μV maximum offset voltage, 0.05 μV/°C maximum drift, and 17 μA quiescent current per channel across 1.8 V to 5.5 V supply, enabling high-accuracy signal conditioning in battery-powered medical sensors and weigh-scale front-ends.

For engineers reviewing the OPA2333AIDRBR datasheet, OPA2333AIDRBR pinout, OPA2333AIDRBR application, or OPA2333AIDRBR equivalent, key selection criteria include its DFN-8 (DRB) package thermal performance (R_θJA = 46.7°C/W), dual-channel auto-calibration architecture, 0.1–10 Hz noise of 1.1 μV_PP, and guaranteed operation from –40°C to +125°C.

Technical Context

The OPA2333AIDRBR implements a proprietary time-continuous auto-calibration technique that corrects input offset every 8 μs using a 350-kHz internal amplifier, eliminating 1/f flicker noise while maintaining unity-gain stability. Its zero-drift architecture achieves near-zero drift without output phase reversal - a critical advantage over chopper-stabilized amplifiers with switching artifacts.

This dual op-amp integrates rail-to-rail input stages extending 100 mV beyond supply rails and rail-to-rail output stages swinging within 50 mV of both rails. It supports single-supply operation down to 1.8 V and features CMRR >106 dB and PSRR >100 dB across frequency, making it suitable for driving SAR ADCs without linearity degradation.

Key Specifications

Pinout & Package

OPA2333AIDRBR is housed in an 8-pin DFN (SON-8) package with 3.0 mm × 3.0 mm body size and an exposed thermal pad on the underside for enhanced heat dissipation. The package is leadless, RoHS-compliant, and designed for standard reflow assembly.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar precision op-amp applications.

Compared with OPA2333AIDRBR, the OPA2333AIDGKR offers identical precision but inferior thermal performance in space-constrained designs, while the AD8629ARZ-REEL7 trades lower initial offset for significantly higher drift and quiescent current - making OPA2333AIDRBR optimal for long-term DC stability in energy-limited systems.

Availability

OPA2333AIDRBR is available at Aetrix Electronics and suitable for medical instrumentation, electronic scales, and battery-powered instruments requiring stable component supply across extended temperature ranges and multi-year production cycles.

Supply support for OPA2333AIDRBR 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 headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.

The OPA2333AIDRBR belongs to TI's Zero-Drift Operational Amplifier product line, engineered specifically for high-precision, low-power DC signal conditioning in applications where offset drift and 1/f noise must be eliminated - such as sensor front-ends, precision instrumentation, and portable measurement equipment.

FAQ

What is the maximum operating junction temperature for OPA2333AIDRBR?

The OPA2333AIDRBR has a maximum operating junction temperature of 150°C, with recommended operating ambient temperature from –40°C to +125°C. Its DFN-8 (DRB) package achieves R_θJA = 46.7°C/W, allowing safe operation at full load up to +105°C ambient when properly mounted on a 2-layer PCB with thermal vias to inner ground planes. Always verify actual T_J using measured board temperatures and power dissipation in the final design.

Does OPA2333AIDRBR support true rail-to-rail output swing?

Yes, the OPA2333AIDRBR provides rail-to-rail output swing, delivering output voltage within 50 mV of both V+ and V– rails under 10 kΩ load conditions. This capability is maintained across the full –40°C to +125°C temperature range and 1.8 V to 5.5 V supply range. For applications requiring swing to exact ground (0 V), TI recommends adding a pulldown resistor to a slightly negative supply - a technique validated in the OPA2333AIDRBR datasheet with accuracy to –2 mV.

How does the auto-calibration architecture of OPA2333AIDRBR differ from traditional chopper amplifiers?

The OPA2333AIDRBR uses a proprietary time-continuous auto-calibration technique that corrects input offset every 8 μs without introducing switching transients or 1/f noise folding. Unlike traditional chopper amplifiers that modulate the signal path and require external filtering, this architecture maintains unity-gain stability and eliminates output phase reversal - verified in the OPA2333AIDRBR datasheet Figure 10 (Large-Signal Step Response). It also avoids aliasing effects seen in sampled-data choppers.

Can OPA2333AIDRBR drive capacitive loads directly?

The OPA2333AIDRBR is not unity-gain stable into arbitrary capacitive loads; its datasheet specifies stable operation with ≤100 pF capacitive load at unity gain. For larger loads (e.g., ADC input capacitance + PCB trace), TI recommends isolating the op-amp output with a series resistor (typically 10–100 Ω) followed by the capacitor to ground. This configuration preserves stability while maintaining bandwidth - as demonstrated in OPA2333AIDRBR Typical Characteristics Figure 15 (Small-Signal Overshoot vs Load Capacitance).

Is the exposed thermal pad on OPA2333AIDRBR required to be connected?

The exposed thermal pad on the OPA2333AIDRBR DFN-8 package should be soldered to a PCB copper pour connected to V– (negative supply) or left unconnected - it must not be floated. TI's datasheet explicitly states this in Section 7.3.5. Connecting the pad to V– improves thermal resistance (R_θJB = 22.2°C/W) and reduces long-term drift caused by thermal gradients. Standard reflow profiles and stencil thicknesses (e.g., 0.12 mm) are validated for reliable pad attachment in production.