Texas Instruments OPA2369AIDGKT

Overview

OPA2369AIDGKT from Texas Instruments is a dual, ultra-low-power, rail-to-rail input/output operational amplifier optimized for 1.8V–5.5V battery-powered systems. It delivers 700nA per channel quiescent current, 250µV max input offset voltage, 12kHz gain-bandwidth product, and zero-crossover architecture to eliminate rail-to-rail input distortion-enabling precision signal conditioning in portable medical sensors and low-voltage data acquisition.

For engineers reviewing the OPA2369AIDGKT datasheet, OPA2369AIDGKT pinout, OPA2369AIDGKT application, or OPA2369AIDGKT equivalent, key selection criteria include its sub-1µA per-channel supply current, true rail-to-rail I/O swing down to 10mV from rails (RL = 100kΩ), 114dB CMRR, 0.4µV/°C offset drift, and VSSOP-8 package compatibility with space-constrained PCB layouts.

Technical Context

The OPA2369AIDGKT implements a zero-crossover input stage that eliminates the offset discontinuity typical of complementary-input rail-to-rail op amps, ensuring monotonic common-mode response across the full 1.8V supply range. Its 12kHz GBW and 0.005V/µs slew rate support low-frequency sensor amplification without phase error or settling delay.

Designed for single-supply operation, it features 10pA input bias current, 10¹³Ω input impedance, and 3.6µVPP (0.1Hz–10Hz) input voltage noise-making it suitable for high-impedance source interfacing in pH probes, thermopiles, and piezoresistive sensors where leakage and noise directly impact measurement fidelity.

Key Specifications

Pinout & Package

VSSOP-8 (DGK) package: 3.0mm × 3.0mm body, 1.1mm max height, 0.65mm lead pitch, exposed thermal pad (non-electrical), RoHS-compliant NiPdAu finish, MSL Level-2-260°C-1 year.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA2369AIDGKT, the OPA2369AIDCNT offers superior thermal resistance in SOT-23-8, while TLV2369IDGKR provides higher ESD immunity at the cost of 150nA higher quiescent current and reduced bandwidth-making OPA2369AIDGKT optimal for ultra-low-power, space-limited, and thermally benign applications.

Availability

OPA2369AIDGKT is available at Aetrix Electronics and suitable for battery-powered instruments, portable medical devices, and low-power sensor signal conditioning requiring stable component supply across extended production lifecycles.

Supply support for OPA2369AIDGKT 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions since 1930.

The OPA2369 series belongs to TI's nanoPOWER precision op amp portfolio, engineered specifically for energy-constrained applications where sub-1µA supply current, rail-to-rail operation, and DC accuracy must coexist without compromise.

FAQ

What is the maximum operating temperature range for the OPA2369AIDGKT?

The OPA2369AIDGKT is specified for operation from –40°C to +85°C ambient temperature, with absolute maximum junction temperature rated at +150°C. Its thermal resistance (θJA) is 252°C/W in the VSSOP-8 package, meaning it can safely dissipate up to ~10mW continuously under typical PCB conditions without exceeding the max junction limit. This makes OPA2369AIDGKT suitable for indoor consumer electronics and portable medical devices but not for under-hood automotive applications.

Does the OPA2369AIDGKT support true rail-to-rail input and output operation?

Yes, the OPA2369AIDGKT supports true rail-to-rail input and output operation across its full 1.8V to 5.5V supply range. The input common-mode voltage range extends from V– to V+, and the output swings to within 10mV of each rail with a 100kΩ load. This capability is enabled by its zero-crossover input architecture, which eliminates the offset discontinuity seen in conventional rail-to-rail op amps-ensuring linear behavior even when input signals approach the supply rails. This feature is critical in OPA2369AIDGKT-based battery monitor and sensor front-end designs.

What is the input bias current specification for the OPA2369AIDGKT?

The OPA2369AIDGKT has a typical input bias current of 10pA and a maximum of 50pA over temperature, as confirmed in the Electrical Characteristics table (page 3 of SBOS414B). This ultra-low IB enables high-impedance sensor interfacing-such as thermistors, pH electrodes, and photodiodes-without significant voltage error or signal attenuation. The 10¹³Ω common-mode input impedance further ensures minimal loading on sensitive sources. These values are measured and guaranteed for OPA2369AIDGKT at TA = +25°C and VS = +5V.

Can the OPA2369AIDGKT drive capacitive loads, and if so, what is the recommended limit?

Yes, the OPA2369AIDGKT can drive capacitive loads, with stability verified up to 100pF according to Figure 20 in the datasheet. For loads exceeding 100pF, a small series resistor (typically 10Ω–50Ω) should be added between the output and the capacitive load to maintain phase margin and prevent peaking or oscillation. This limitation arises from the amplifier's 12kHz GBW and internal compensation; unlike higher-speed op amps, OPA2369AIDGKT does not require external compensation networks for standard sensor buffering applications.

How does the zero-crossover architecture in the OPA2369AIDGKT improve performance compared to standard rail-to-rail op amps?

The zero-crossover architecture in the OPA2369AIDGKT eliminates the input offset voltage discontinuity that occurs when standard rail-to-rail op amps switch between N-channel and P-channel input pairs near the supply rails. This results in monotonic common-mode rejection and predictable DC transfer characteristics across the entire input range-critical for precision instrumentation and battery voltage monitoring. Unlike conventional designs where CMRR degrades sharply near the rails, OPA2369AIDGKT maintains >100dB CMRR from V– to V+, as shown in Figure 10. This behavior is intrinsic to the OPA2369AIDGKT silicon design and is not achievable through external circuitry.