Texas Instruments OPA2380AIDGKR

Overview

OPA2380AIDGKR from Texas Instruments is a dual-channel precision transimpedance amplifier optimized for high-speed photodiode current-to-voltage conversion. It delivers 90MHz gain-bandwidth, 25µV max offset voltage, 0.1µV/°C max drift, 50pA max input bias current (inverting input), and operates from 2.7V to 5.5V supply. It enables >1MHz transimpedance bandwidth in optical front-ends such as CAT-scan detectors and fiber power monitoring.

For engineers reviewing the OPA2380AIDGKR datasheet, OPA2380AIDGKR pinout, OPA2380AIDGKR application, or OPA2380AIDGKR equivalent, key selection criteria include transimpedance bandwidth stability across photodiode capacitance variations, output swing to 0V with external pulldown, long-term VOS drift ≤0.1µV/°C, and dual-channel channel separation ≥95dB at DC.

Technical Context

The OPA2380AIDGKR integrates an auto-zero core with a continuous-time 90MHz signal-path amplifier, correcting offset every 100µs without introducing significant 10kHz artifacts. Its architecture eliminates 1/f noise while preserving wideband performance-critical for maintaining SNR across 4–5 decades of photocurrent (1nA to 100µA).

It operates exclusively in inverting transimpedance configuration, with noninverting inputs used for fixed biasing. Input common-mode range extends from V− to (V+) − 1.8V, and output can swing within 100mV of V− (or to 0V with −5V pulldown resistor), supporting single-supply optical sensing with ground-referenced output.

Key Specifications

Pinout & Package

OPA2380AIDGKR is housed in an MSOP-8 package (2.0mm × 3.0mm, 0.65mm pitch), optimized for space-constrained optical sensor PCBs. Thermal resistance θ_JA = 150°C/W enables operation at full rating without forced airflow.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar transimpedance amplifier applications.

Compared with OPA380AIDGKR, the single-channel variant offers identical per-channel performance in a shared footprint but requires two ICs for dual-sensor systems-increasing cost and board area. Versus OPA2188AIDR, OPA2380AIDGKR provides verified >1MHz transimpedance bandwidth, guaranteed 0V output swing, and photodiode-specific layout support-making it the only validated choice for high-speed optical front-ends.

Availability

OPA2380AIDGKR is available at Aetrix Electronics and suitable for photodiode monitoring, CAT-scan front-end modules, and precision optical power control requiring stable component supply across automotive, medical imaging, and industrial test equipment programs.

Supply support for OPA2380AIDGKR 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 op amps and signal-chain solutions.

The OPA2380AIDGKR belongs to TI's precision transimpedance amplifier product line, engineered specifically for high-speed, low-drift optical current sensing in medical, industrial, and communications equipment where dynamic range and long-term stability are critical.

FAQ

What is the maximum transimpedance bandwidth achievable with OPA2380AIDGKR?

The OPA2380AIDGKR achieves >1MHz transimpedance bandwidth in typical configurations-verified with photodiode capacitance up to 100pF and feedback resistors up to 10MΩ. This is enabled by its 90MHz gain-bandwidth product and low input capacitance (1.1pF differential). Bandwidth scales inversely with √(C_DIODE × R_F), so lower photodiode capacitance yields higher usable bandwidth. The OPA2380AIDGKR datasheet provides design equations and compensation guidelines for optimizing this trade-off.

Does OPA2380AIDGKR support true 0V output swing?

Yes-OPA2380AIDGKR supports output swing to 0V when a 2kΩ pulldown resistor is connected between V_OUT and −5V, as documented in Figure 3 of the SBOS291G datasheet. This configuration extends the negative output swing from the standard 100mV above V− to 0V (or slightly below), enabling direct interface with unipolar ADCs and eliminating level-shifting circuitry in optical front-ends.

How does OPA2380AIDGKR handle input overvoltage conditions?

OPA2380AIDGKR features ESD diodes that conduct when input voltages exceed the supply rails by >500mV. It tolerates momentary overvoltage if current is limited to ≤10mA-no phase inversion occurs. Unlike many op amps, it remains functional outside the common-mode range (V− to V+ − 1.8V) without latching, though output becomes invalid. This robustness protects against photodiode transient spikes in optical systems.

What is the long-term offset voltage stability of OPA2380AIDGKR?

OPA2380AIDGKR demonstrates excellent long-term V_OS stability: a 300-hour life test at 150°C showed variation ≈1µV-comparable to measurement repeatability. This translates to negligible drift in field-deployed systems over years of operation, making it suitable for medical CT scanners and other equipment requiring calibration intervals exceeding 12 months.

Can OPA2380AIDGKR be used with single-supply photodiode biasing?

Yes-OPA2380AIDGKR is explicitly designed for single-supply photodiode circuits. Its noninverting input (+In A/B) accepts a DC bias voltage (e.g., 0.5V) to reverse-bias the photodiode and establish a dark-output reference. Figure 4 in the datasheet shows an RC-filtered bias network that reduces noise while maintaining fast response-enabling accurate zero-light detection without negative supplies.