Texas Instruments OPA2328DR

Overview

OPA2328DR from Texas Instruments is a dual-channel, precision, rail-to-rail input/output CMOS operational amplifier optimized for low-noise, high-speed signal conditioning in single-supply systems. It delivers 40MHz gain-bandwidth, 30V/µs slew rate, 50µV max offset voltage, 1pA max input bias current, and 6.1nV/√Hz input voltage noise at 10kHz - enabling high-fidelity amplification in optical modules and CT/PET scanner front-ends.

For engineers reviewing the OPA2328DR datasheet, OPA2328DR pinout, OPA2328DR application, or OPA2328DR equivalent, key selection criteria include its zero-crossover distortion architecture, e-trim™-enabled ultra-low drift, 2.2V–5.5V single-supply operation, and verified stability driving ADC inputs with <180ns 0.01% settling time.

Technical Context

The OPA2328DR implements a proprietary charge-pump–assisted PMOS input stage that extends the input common-mode range 100mV beyond both rails while eliminating crossover distortion - delivering 120dB typical CMRR across full V_CM. Its e-trim™ technology achieves ±50µV max V_OS and ±1µV/°C max drift without auto-zero switching artifacts.

This dual op amp operates unity-gain stable with 28pF capacitive load drive capability and supports fast overload recovery (0.5µs) and low THD+N (0.0001% at 1kHz). It is specified from –40°C to +125°C and draws 4.5mA per channel at 5.5V.

Key Specifications

Pinout & Package

OPA2328DR is packaged in an 8-pin SOIC (D package), with exposed thermal pad on underside for enhanced heat dissipation in continuous high-output applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA2188AIDR and ADA4522-2ARMZ, the OPA2328DR uniquely balances 40MHz bandwidth, 1pA input bias, and rail-to-rail operation - making it the only option among the three suitable for high-speed, high-impedance, single-supply signal chains like optical transceivers and medical imaging front-ends.

Availability

OPA2328DR is available at Aetrix Electronics and suitable for optical module design, CT/PET scanner development, and multiparameter patient monitor production requiring stable component supply and long-term industrial availability.

Supply support for OPA2328DR 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 expertise in precision amplifiers and signal-chain solutions.

The OPAx328 family was designed specifically for high-fidelity, wideband signal conditioning in medical imaging, optical communications, and industrial sensing - emphasizing zero-crossover linearity, ultra-low input current, and robust single-supply operation.

FAQ

What is the maximum operating temperature for the OPA2328DR?

The OPA2328DR is fully specified from –40°C to +125°C ambient temperature. Its thermal design - including 123.9°C/W junction-to-ambient resistance in the SOIC package - supports reliable operation in demanding environments such as CT scanner electronics cabinets and industrial motor control enclosures. The device maintains all key parameters, including 50µV max offset and 40MHz bandwidth, across this full range.

Does the OPA2328DR have shutdown functionality?

No, the OPA2328DR does not include shutdown functionality. Only the YBJ (DSBGA) variant of the OPA2328 - designated OPA2328YBJ - integrates a shared shutdown pin (SHDN) for both channels. The DR suffix explicitly denotes the 8-pin SOIC package without shutdown. For designs requiring power gating, consider the OPA2328YBJ or discrete enable circuitry.

Can the OPA2328DR drive a 10-bit SAR ADC directly?

Yes, the OPA2328DR is explicitly optimized for ADC driving: its 180ns 0.01% settling time, 30V/µs slew rate, and 40MHz bandwidth ensure full settling before typical 10-bit SAR conversion windows (e.g., <500ns). With <6.1nV/√Hz noise and rail-to-rail output swing, it delivers the dynamic range and linearity required for 10-bit accuracy without external buffering.

What is the input common-mode voltage range of the OPA2328DR?

The OPA2328DR features true rail-to-rail input operation, with a common-mode voltage range extending 100mV beyond both supply rails - i.e., from (V–) – 0.1V to (V+) + 0.1V. This is enabled by an internal charge pump that biases the PMOS input pair, allowing linear operation even when inputs exceed the supply rails - critical for level-shifting and fault-tolerant sensor interfaces.

Is the OPA2328DR unity-gain stable?

Yes, the OPA2328DR is unity-gain stable and characterized for operation with capacitive loads up to 100pF in G=1 configuration. Its internal compensation ensures ≥45° phase margin under recommended conditions. For heavier loads (>100pF), a small series resistor (10Ω–50Ω) at the output restores stability without degrading signal integrity - a technique validated in TI's SBOS957G datasheet Figure 7-1.