Texas Instruments OPA2373AIDRCT

Overview

OPA2373AIDRCT from Texas Instruments is a dual-channel, rail-to-rail input/output CMOS operational amplifier with shutdown control, designed for low-power precision signal conditioning in space-constrained systems. It delivers 6.5 MHz gain-bandwidth, 5 V/µs slew rate, and 585 µA quiescent current per channel at 5 V supply, operating from 2.3 V to 5.5 V. Its key use case is driving SAR ADC inputs in battery-powered portable instrumentation.

For engineers reviewing the OPA2373AIDRCT datasheet, OPA2373AIDRCT pinout, OPA2373AIDRCT application, or OPA2373AIDRCT equivalent, this page provides verified technical context, real-world design implications of rail-to-rail I/O swing and shutdown timing, package-specific thermal behavior, and validated alternative options for dual-channel low-power op amp selection.

Technical Context

The OPA2373AIDRCT implements a complementary N/P-channel input stage enabling rail-to-rail common-mode input range extending 200 mV beyond both supply rails, with a 500-mV transition region where PSRR and CMRR degrade. Its class AB output stage supports rail-to-rail output swing - within 18 mV of rails at 100 kΩ load and 125 mV at 5 kΩ - while maintaining >80 dB open-loop gain across –40°C to 125°C.

Each channel features independent logic-controlled shutdown (Enable A/B), reducing quiescent current to <1 µA per amplifier. Turnon/turnoff times are 12 µs and 3 µs respectively, with enable thresholds referenced to V–: logic high ≥ (V–) + 2 V, logic low ≤ (V–) + 0.8 V. Input bias current remains ≤10 pA across temperature.

Key Specifications

Pinout & Package

OPA2373AIDRCT is packaged in a 10-pin VSSOP (DRC) with 3.00 mm × 3.00 mm body size and exposed thermal pad (connected to V−). The package supports fine-pitch PCB layout and offers 56.4°C/W junction-to-ambient thermal resistance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel low-power op amp applications.

Compared with OPA2373AIDRCT, OPA2374AIDR removes shutdown capability but maintains identical AC performance and footprint compatibility, while MCP6022-E/SN trades off power efficiency for higher bandwidth and wider supply range - making OPA2373AIDRCT optimal for battery-critical, dynamically powered systems requiring per-channel control.

Availability

OPA2373AIDRCT is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered data loggers, industrial current sensing, and low-voltage signal chain interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for OPA2373AIDRCT 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 delivering analog and embedded processing solutions, with deep expertise in precision amplifiers, power management, and signal chain ICs.

The OPAx373 family was engineered specifically for low-power, rail-to-rail precision amplification in space-constrained, battery-operated systems - emphasizing shutdown control, wide supply range, and robust operation from –40°C to 125°C.

FAQ

What is the maximum operating supply voltage for OPA2373AIDRCT?

The absolute maximum supply voltage for OPA2373AIDRCT is 7 V, but the recommended operating range is 2.3 V to 5.5 V. Operation above 5.5 V risks permanent damage, while operation below 2.3 V may cause degraded AC performance or failure to meet specified gain-bandwidth and slew rate. Always refer to Section 7.3 of the SBOS279F datasheet for validated conditions.

Does OPA2373AIDRCT support true rail-to-rail input with signals beyond the supply rails?

Yes - OPA2373AIDRCT supports input voltages from (V−) −0.2 V to (V+) + 0.2 V, extending 200 mV beyond both rails. Inputs exceeding this range but staying within absolute maximum ratings (−0.5 V to V+ + 0.5 V) are safe if current-limited to ≤10 mA, enabled by its complementary N/P-channel input stage without phase inversion.

How does the shutdown feature work on OPA2373AIDRCT?

OPA2373AIDRCT has two independent enable pins (Enable A and Enable B). When either pin is held ≤ (V−) + 0.8 V, its corresponding amplifier enters shutdown with quiescent current <1 µA. At ≥ (V−) + 2 V, the amplifier operates normally. Turnon/turnoff times are 12 µs and 3 µs, respectively - critical for low-duty-cycle sensor readout schemes.

Can OPA2373AIDRCT drive a 1000-pF capacitive load in unity-gain configuration?

No - OPA2373AIDRCT is stable with up to ~250 pF in unity-gain configuration. Driving 1000 pF directly causes peaking and potential oscillation due to phase margin erosion. For larger loads, add a 10–20 Ω isolation resistor between output and capacitance, or increase closed-loop gain to improve stability margin per Figure 17 in the SBOS279F datasheet.

What is the thermal performance difference between VSON and VSSOP packages for OPA2373AIDRCT?

OPA2373AIDRCT in VSSOP (DRC) has RθJA = 56.4°C/W, significantly better than VSON (DGS) at 170.6°C/W. This 3× improvement enables higher continuous output current or operation in hotter ambient environments without derating. The VSSOP's lower thermal resistance stems from superior PCB copper coupling via its exposed leadframe and smaller die-pad interface.