Texas Instruments OPA373AIDBVR

Overview

OPA373AIDBVR from Texas Instruments is a single-channel, rail-to-rail input/output CMOS operational amplifier optimized for low-power, battery-operated systems. It delivers 6.5 MHz gain-bandwidth, 5 V/µs slew rate, and 585 µA quiescent current per amplifier while operating from 2.3 V to 5.5 V supply. Its shutdown mode reduces current to <1 µA, making it ideal for portable instrumentation and sensor signal conditioning.

For engineers reviewing the OPA373AIDBVR datasheet, OPA373AIDBVR pinout, OPA373AIDBVR application, or OPA373AIDBVR equivalent, key selection criteria include its 5 mV max input offset, 10 pA max input bias current, rail-to-rail I/O swing within 25 mV of rails, operation up to 125°C, and 6-pin SOT-23 package compatibility with space-constrained PCB layouts.

Technical Context

The OPA373AIDBVR uses a complementary CMOS input stage enabling rail-to-rail input common-mode range extending 200 mV beyond both supply rails. Its class AB output stage supports rail-to-rail output swing-within 18 mV at light loads (100 kΩ) and 125 mV at 5 kΩ-while maintaining >80 dB open-loop gain across –40°C to 125°C.

It integrates logic-controlled shutdown with 3 µs turnoff and 12 µs turnon times, reducing quiescent current to <1 µA. The device is unity-gain stable and specified for capacitive loads up to 250 pF in G = +1 configuration, with PSRR and CMRR exceeding 128 dB and 90 dB respectively at 25°C.

Key Specifications

Pinout & Package

OPA373AIDBVR is housed in a 6-pin SOT-23 (DBV) package measuring 2.90 mm × 1.60 mm, with exposed thermal pad on underside connected to V−.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA373AIDBVR, OPA374AIDBVR removes shutdown control to save one pin and reduce cost, while MCP6001T-E/OT trades bandwidth and precision for significantly lower quiescent current-making each viable only when their specific trade-offs align with system-level power, accuracy, and feature requirements.

Availability

OPA373AIDBVR is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered data loggers, active anti-aliasing filters, and industrial 4–20 mA loop receivers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for OPA373AIDBVR 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 specializing in analog and embedded processing technologies, with leadership in precision amplifiers, power management, and signal chain solutions.

The OPA373 family was designed specifically for low-power, high-accuracy signal conditioning in space- and energy-constrained applications-including portable instrumentation, sensor interfaces, and battery-operated industrial devices.

FAQ

What is the maximum capacitive load the OPA373AIDBVR can drive stably in unity-gain configuration?

The OPA373AIDBVR is unity-gain stable and characterized to drive up to 250 pF of pure capacitive load without oscillation or excessive overshoot. This capability eliminates the need for series isolation resistors in ADC driver applications. For loads exceeding 250 pF, adding a small (10–20 Ω) resistor between the output and capacitive load restores phase margin. Stability is confirmed across –40°C to 125°C and 2.3 V to 5.5 V supply range.

Does the OPA373AIDBVR support true rail-to-rail input when powered from a 2.3-V supply?

Yes, the OPA373AIDBVR maintains rail-to-rail input operation down to 2.3 V supply, with common-mode range specified from (V−) −0.2 V to (V+) + 0.2 V. At 2.3 V, this means inputs can range from –0.2 V to +2.5 V-enabling direct interface with sensors whose outputs swing near ground or VCC. Input protection diodes clamp at ±0.5 V beyond rails, and current limiting to ≤10 mA prevents damage during overvoltage events.

How does the shutdown feature of the OPA373AIDBVR affect system power architecture?

The OPA373AIDBVR shutdown pin (Pin 5) reduces quiescent current to <1 µA when driven high (≥(V−)+2 V), cutting active-mode current (585 µA) by >99.8%. This enables precise power gating in time-sliced systems like multi-channel data acquisition, where amplifiers are enabled only during sample windows. The 12-µs turnon time ensures minimal dead time before valid signal acquisition begins, preserving timing integrity in synchronized measurement sequences.

Can the OPA373AIDBVR operate reliably at 125°C ambient temperature?

Yes, the OPA373AIDBVR is fully specified and tested from –40°C to +125°C ambient temperature, including all key parameters: 6.5-MHz GBW, 585-µA IQ, 5-mV max offset, and 80-dB min open-loop gain. Thermal resistance (RθJA = 184.3°C/W for DBV package) and junction-to-board metrics confirm safe operation under sustained 125°C conditions when PCB copper area meets minimum recommendations. No derating is required within datasheet limits.

What is the typical input bias current of the OPA373AIDBVR at 85°C?

The OPA373AIDBVR exhibits ultra-low input bias current, with a maximum of 10 pA over –40°C to 125°C. At 85°C, typical input bias current remains below 1 pA-consistent with its CMOS input stage design. This enables use in high-impedance sensor interfaces (e.g., piezoelectric accelerometers, ion-selective electrodes) where leakage-induced errors must stay below 100 nV in 100-MΩ source impedances, even at elevated temperatures.