Texas Instruments OPA2325IDGKT

Overview

OPA2325IDGKT from Texas Instruments is a dual-channel, precision rail-to-rail input/output CMOS operational amplifier optimized for low-noise (9 nV/√Hz at 10 kHz), wide bandwidth (10 MHz), and low quiescent current (650 µA per channel). It features zero-crossover distortion, 114 dB CMRR, and ±150 µV max input offset voltage - making it ideal for SAR ADC input buffering in battery-powered instrumentation and PLC analog front-ends.

For engineers reviewing the OPA2325IDGKT datasheet, OPA2325IDGKT pinout, OPA2325IDGKT application, or OPA2325IDGKT equivalent, key selection criteria include its guaranteed 10-MHz gain-bandwidth, rail-to-rail I/O swing within 10 mV of supply rails, e-trim™ DC precision, and operation from 2.2 V to 5.5 V single supply - critical for high-fidelity signal conditioning in space-constrained, low-power systems.

Technical Context

The OPA2325IDGKT implements a charge-pump–assisted linear input stage that eliminates crossover distortion across the full rail-to-rail common-mode range (extending 100 mV beyond both rails), enabling stable CMRR >100 dB over temperature and supply variations. Its unity-gain stability and 5 V/µs slew rate support fast settling (0.6 µs to 0.1%) into capacitive loads up to 15 pF.

Designed for precision analog signal chains, it delivers 130 dB typical open-loop gain, 7.5 µV/°C max offset drift, and <0.2 pA input bias current - enabling high-Z sensor interfacing and transimpedance amplification without significant error sources from bias current or thermal drift.

Key Specifications

Pinout & Package

OPA2325IDGKT is packaged in an 8-pin VSSOP (DGK) with body size 3.00 mm × 3.00 mm, optimized for high-density PCB layouts while maintaining thermal resistance R_θJA = 143°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA2333AIDR and AD8605ARMZ, the OPA2325IDGKT uniquely combines 10-MHz bandwidth, zero-crossover linearity, and e-trim DC precision - making it the only option among the three qualified for high-resolution, high-speed SAR ADC driving without performance trade-offs.

Availability

OPA2325IDGKT is available at Aetrix Electronics and suitable for high-precision analog front-ends, battery-powered instrumentation, and industrial PLC signal conditioning requiring stable component supply and long-term production continuity.

Supply support for OPA2325IDGKT 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 OPAx325 family was designed specifically for high-fidelity, low-power signal conditioning in battery-operated and space-constrained systems - emphasizing rail-to-rail operation, zero-crossover linearity, and e-trim DC accuracy without sacrificing speed or noise performance.

FAQ

What is the maximum supply voltage for OPA2325IDGKT?

The OPA2325IDGKT supports a maximum single-supply voltage of 5.5 V or dual-supply operation up to ±2.75 V. Exceeding these limits risks permanent damage, as specified in the Absolute Maximum Ratings table. Operation at 5.5 V enables full rail-to-rail output swing and optimal PSRR performance across the entire temperature range (–40°C to +125°C).

Does OPA2325IDGKT require external compensation for unity-gain stability?

No, the OPA2325IDGKT is internally compensated and unity-gain stable. It drives capacitive loads up to 15 pF with ≥67° phase margin and no peaking, as verified in the Typical Characteristics (Figure 5). This eliminates the need for external compensation networks in standard ADC driver or buffer configurations.

How does the zero-crossover architecture improve performance in OPA2325IDGKT?

The OPA2325IDGKT uses an internal charge pump to power a single linear input differential pair, eliminating the offset discontinuity seen in traditional complementary CMOS input stages. This results in flat CMRR (>100 dB) and consistent distortion performance across the full input common-mode range (–0.1 V to V_S + 0.1 V), which is essential for accurate rail-to-rail ADC driving.

What is the typical input bias current of OPA2325IDGKT at 25°C?

The typical input bias current of OPA2325IDGKT is ±0.2 pA at 25°C, with a maximum of ±10 pA over temperature (–40°C to +125°C). This ultra-low value minimizes voltage errors in high-impedance sensor interfaces and ensures negligible loading on source impedances up to 10 GΩ in precision measurement circuits.

Can OPA2325IDGKT operate from a 2.2-V single supply?

Yes, the OPA2325IDGKT is fully specified for operation from 2.2 V to 5.5 V single supply. At 2.2 V, it maintains 10-MHz gain bandwidth, 114 dB CMRR, and rail-to-rail I/O - enabling direct use in energy-harvesting and coin-cell–powered systems without voltage boosting or regulation.