Texas Instruments OPA2320SAIDGST

Overview

OPA2320SAIDGST from Texas Instruments is a dual-channel, precision, rail-to-rail input/output CMOS operational amplifier optimized for low-noise (7 nV/√Hz at 10 kHz), high-speed (20-MHz GBW), and ultra-low input bias current (0.9 pA max) operation on single supplies from 1.8 V to 5.5 V. It features active shutdown per channel (SHDN A/B), 150 µV max offset voltage, and 114 dB CMRR - ideal for high-impedance sensor signal conditioning and transimpedance amplifier stages in portable instrumentation.

For engineers reviewing the OPA2320SAIDGST datasheet, OPA2320SAIDGST pinout, OPA2320SAIDGST application, or OPA2320SAIDGST equivalent, key selection criteria include verified shutdown timing (t_ON = 20 µs full, t_OFF = 3 µs), guaranteed rail-to-rail output swing within 20 mV of rails (RL = 10 kΩ), and confirmed 10 V/µs slew rate driving ADC input buffers without distortion.

Technical Context

The OPA2320SAIDGST implements a linear input stage with zero-crossover distortion architecture, enabling stable common-mode rejection (114 dB typ) across the full input range from (V–) – 0.1 V to (V+) + 0.1 V. Its CMOS input stage delivers 0.9 pA max input bias current at 25°C and maintains < ±400 pA over –40°C to +125°C.

Each channel operates independently with dedicated active-low SHDN pins (pins 5 and 6), supporting partial shutdown (one channel active) with 6 µs enable time or full shutdown (both channels disabled) with 20 µs enable time and 0.1 µA total quiescent current. The device achieves unity-gain stability while driving ≥50 pF capacitive loads.

Key Specifications

Pinout & Package

VSSOP-10 (DGK/DGS) package: 3.00 mm × 3.00 mm body, exposed thermal pad connected to V–, rated for 171.5°C/W junction-to-ambient thermal resistance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA2320SAIDGST, OPA2313AIDR trades bandwidth and shutdown for cost reduction, while OPA2322AIDGKR matches speed but lacks shutdown and has higher input bias - making OPA2320SAIDGST uniquely suited for battery-powered, high-impedance, dual-channel systems requiring independent power control.

Availability

OPA2320SAIDGST is available at Aetrix Electronics and suitable for high-impedance sensor signal conditioning, transimpedance amplifier designs, and programmable logic controller (PLC) analog input modules requiring stable component supply and long-term manufacturability.

Supply support for OPA2320SAIDGST 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 OPAx320 family was designed specifically for high-resolution data acquisition systems - targeting low-power, single-supply operation with uncompromised DC precision, AC performance, and robustness in harsh environments.

FAQ

What is the maximum input bias current specification for OPA2320SAIDGST over temperature?

The OPA2320SAIDGST specifies ±400 pA maximum input bias current over the full operating temperature range of –40°C to +125°C. This value is confirmed in the Electrical Characteristics table under "INPUT BIAS CURRENT" for OPA2320 and OPA2320S variants. At 25°C, the limit is tighter: ±0.9 pA max. These values are measured with VS = 1.8 V to 5.5 V and ensure minimal error in high-impedance sensor interfaces across industrial temperature extremes. The OPA2320SAIDGST maintains this performance without external calibration.

Does OPA2320SAIDGST support true rail-to-rail input and output operation?

Yes, OPA2320SAIDGST supports true rail-to-rail input and output. Its input common-mode voltage range extends from (V–) – 0.1 V to (V+) + 0.1 V, and its output swings to within 20 mV of each rail with a 10-kΩ load at 25°C. This is explicitly verified in the "INPUT VOLTAGE" and "OUTPUT" sections of the datasheet. The rail-to-rail capability enables full utilization of 1.8-V to 5.5-V supply ranges in battery-powered and low-voltage industrial systems without level-shifting circuitry.

What is the shutdown behavior of OPA2320SAIDGST when only one channel is disabled?

When only one channel (e.g., SHDN A = V–, SHDN B = V+) is disabled, OPA2320SAIDGST enters partial shutdown mode: the disabled channel draws ~1.6 mA quiescent current (not 0.1 µA), while the enabled channel remains fully operational with normal performance. Full shutdown - where both SHDN A and SHDN B are pulled low - reduces total IQ to 0.1 µA. This behavior is documented in the "SHUTDOWN" subsection of the Electrical Characteristics table and enables flexible power sequencing in multi-channel signal chains using OPA2320SAIDGST.

Can OPA2320SAIDGST drive a 50-pF capacitive load stably?

Yes, OPA2320SAIDGST is characterized for stable operation with ≥50-pF capacitive loads, as confirmed in Figure 4 (Open-Loop Gain/Phase vs Frequency) and the "FREQUENCY RESPONSE" section specifying phase margin = 47° at CL = 50 pF and VS = 5 V. The device remains unity-gain stable under these conditions, making it suitable for driving ADC input capacitors, long PCB traces, or filtering networks without external isolation resistors. No additional compensation is required for 50-pF loads in standard configurations.

What package type and thermal characteristics apply to OPA2320SAIDGST?

OPA2320SAIDGST is supplied in the 10-pin VSSOP (DGS) package with 3.00 mm × 3.00 mm body size and an exposed thermal pad connected to V–. Its thermal metrics include R_θJA = 171.5°C/W, R_θJC(top) = 43°C/W, and ψ_JB = 89.9°C/W - all specified in Section 6.6 of the datasheet. These values confirm suitability for compact industrial PCB layouts with moderate airflow, and the thermal pad must be soldered to a V– plane for optimal heat dissipation and electrical stability.