Texas Instruments OPA2301AIDGKR

Overview

OPA2301AIDGKR from Texas Instruments is a dual-channel, low-noise, fast-settling CMOS operational amplifier optimized for 16-bit resolution systems. It delivers 150MHz unity-gain bandwidth, 3nV/√Hz input voltage noise, and 150ns 16-bit settling time, operating from a single +2.7V to +5.5V supply. Its rail-to-rail output swing (within 100mV of rails) and VSSOP-8 package make it ideal for high-fidelity ADC driver applications in portable instrumentation.

For engineers reviewing the OPA2301AIDGKR datasheet, OPA2301AIDGKR pinout, OPA2301AIDGKR application, or OPA2301AIDGKR equivalent, key selection criteria include its dual-channel configuration, 9.5mA quiescent current per amplifier, shutdown capability (5µA), unity-gain stability, and compatibility with 16-bit data acquisition systems requiring low THD+N (0.003%) and high common-mode rejection (80dB).

Technical Context

The OPA2301AIDGKR employs a classic two-stage CMOS topology with folded-cascode input and Class AB output stage, enabling both high slew rate (80V/µs) and rail-to-rail output swing. Its differential input pair is biased for optimal bandwidth–stability trade-off, supporting stable operation at unity gain without external compensation.

Unlike the OPA2300, the OPA2301 lacks an enable/shutdown pin - confirmed by pin configuration diagrams (Figure 4-6) and absence of Enable functionality in its SO-8 and VSSOP-8 variants. It operates across –40°C to +125°C and features ultra-low input bias current (±0.1pA typical) and high open-loop gain (106dB), making it suitable for high-impedance sensor interfaces and precision signal conditioning.

Key Specifications

Pinout & Package

VSSOP-8 (DGK) package: 3mm × 3mm, 0.65mm pitch, thermally enhanced, surface-mount, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel, high-speed op amp applications.

Compared with OPA2301AIDGKR, the OPA2350EA/250 trades bandwidth and noise for lower power and cost in sub-10MHz systems, while the LMH6629MA/NOPB provides extreme bandwidth at the expense of increased power, noise floor, and PCB layout complexity-making OPA2301AIDGKR the balanced choice for 16-bit, 1–100MHz precision signal chains.

Availability

OPA2301AIDGKR is available at Aetrix Electronics and suitable for high-resolution data acquisition, portable instrumentation, and industrial sensor interface applications requiring stable component supply, extended temperature support (–40°C to +125°C), and long-term production continuity.

Supply support for OPA2301AIDGKR 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 high-performance op amps and precision signal chain solutions.

The OPAx30x product line was designed specifically for 16-bit resolution systems demanding low noise, fast settling, and single-supply operation-targeting data acquisition, test equipment, and communications infrastructure.

FAQ

What is the maximum capacitive load the OPA2301AIDGKR can drive stably in unity-gain configuration?

The OPA2301AIDGKR is stable driving up to ~5pF of capacitive load in unity-gain configuration, as shown in Figure 5-16 of the datasheet. For larger loads (e.g., ADC input capacitance + PCB trace), a series resistor (RS) between output and load is required-e.g., 20Ω for 100pF-to maintain phase margin and prevent peaking. Layout parasitics must be minimized to avoid unintentional instability.

Does the OPA2301AIDGKR include a shutdown or enable function?

No, the OPA2301AIDGKR does not include a shutdown or enable function. Unlike the OPA2300 (which has Enable pins), the OPA2301AIDGKR's VSSOP-8 pinout (Figure 4-6) contains only dual amplifier I/O and supply pins-no dedicated control terminal. This is confirmed by the absence of shutdown specifications (e.g., IQSD, tON/tOFF) in its electrical characteristics table.

What is the recommended power supply bypassing scheme for OPA2301AIDGKR in high-speed applications?

For OPA2301AIDGKR, use a 0.1µF ceramic capacitor placed within 2mm of Pins 4 (V−) and 5 (V+) to ground, plus a 4.7µF–10µF bulk tantalum or ceramic capacitor near the supply entry point. This dual-tier approach suppresses high-frequency noise (via 0.1µF) and low-frequency droop (via bulk cap), maintaining PSRR >50dB up to 100kHz as specified.

Can OPA2301AIDGKR operate from a ±2.5V dual supply?

Yes, OPA2301AIDGKR supports dual-supply operation with total supply voltage between 2.7V and 5.5V-so ±2.5V (5V total) is fully supported. Its input common-mode range extends to (V−) − 0.2V and (V+) − 0.9V, and output swings to within 100mV of each rail, enabling full utilization of the ±2.5V range in bipolar signal conditioning.

How does the OPA2301AIDGKR's input bias current affect high-impedance sensor interfaces?

With typical input bias current of ±0.1pA, the OPA2301AIDGKR introduces negligible voltage error-even with source impedances up to 100MΩ (e.g., pH electrodes or piezoelectric sensors). At 25°C, this yields <10µV offset error, and the bias current remains below ±5pA across –40°C to +125°C (per Figure 5-22), ensuring stable calibration over industrial temperature ranges.