Texas Instruments OPA363ID

Overview

OPA363ID from Texas Instruments is a single, rail-to-rail input/output CMOS operational amplifier optimized for low-voltage, single-supply operation (1.8 V to 5.5 V). It delivers 7 MHz gain-bandwidth, 90 dB typical CMRR, 5 V/µs slew rate, and features an active-low shutdown pin enabling <1 µA quiescent current per channel - ideal for battery-powered microphone preamplifiers and sensor signal conditioning.

For engineers reviewing the OPA363ID datasheet, OPA363ID pinout, OPA363ID application, or OPA363ID equivalent, key selection criteria include its shutdown functionality (absent in OPA364), rail-to-rail I/O swing within 10 mV of rails, ±1 pA input bias current at 25°C, and guaranteed operation from –40°C to +125°C in SOIC-8 packaging.

Technical Context

The OPA363ID uses a complementary CMOS input stage that eliminates crossover distortion, ensuring high CMRR (90 dB typ) across the full input common-mode range (–0.1 V to V_S + 0.1 V) without phase reversal. Its internal charge-pump topology enables rail-to-rail output swing (within 10 mV of V₊/V_–) even at 1.8 V supply.

Shutdown is controlled by an active-low logic input (pin 8), reducing quiescent current to 0.9 µA while preserving fast turnon (20 µs) and turnoff (1 µs) timing. The device is unity-gain stable and drives capacitive loads up to 100 pF with minimal overshoot.

Key Specifications

Pinout & Package

OPA363ID is supplied in an 8-pin SOIC (D package) with 4.90 mm × 3.91 mm body size. Pin 1 is marked via notch or dot; pin numbering follows standard SOIC convention (counterclockwise from top-left).

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA363ID, OPA364IDR removes shutdown capability but offers identical AC performance in a potentially smaller package, while OPA2333AIDR trades higher quiescent current for microvolt-level offset stability - making OPA363ID the optimal balance of low-power shutdown, rail-to-rail operation, and industrial temperature range.

Availability

OPA363ID is available at Aetrix Electronics and suitable for electret microphone preamplifiers, industrial sensor signal conditioners, and portable medical biosensor interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for OPA363ID 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 low-power signal chain solutions.

The OPA363 family was designed specifically for battery-operated, space-constrained systems needing rail-to-rail I/O, shutdown control, and robust performance from –40°C to +125°C - targeting audio, industrial sensing, and portable medical applications.

FAQ

What is the maximum capacitive load the OPA363ID can drive while maintaining stability?

The OPA363ID is specified to drive up to 100 pF capacitive loads with minimal overshoot in unity-gain configuration. For loads exceeding 100 pF, external isolation resistance (e.g., 10–50 Ω in series with the output) is recommended to preserve phase margin. This capability supports direct connection to ADC input capacitors and long PCB traces in compact sensor nodes without added buffering stages.

Does the OPA363ID require external compensation for unity-gain operation?

No, the OPA363ID is internally compensated and unity-gain stable across its full operating range (1.8 V to 5.5 V, –40°C to +125°C). No external compensation components are needed for G = 1 configurations, simplifying layout and reducing BOM count in microphone preamp and buffer designs where minimal gain error and wide bandwidth are required.

How does the shutdown function of the OPA363ID behave during power-up?

During power-up, the OPA363ID's Enable pin (Pin 8) defaults to high-impedance until V+ reaches ~1.2 V; the amplifier remains disabled until the Enable pin is actively pulled low or driven to a valid logic high (>0.75×V+). This prevents output glitches and ensures predictable startup sequencing in multi-rail systems - a behavior confirmed in TI's SBOS259F datasheet Figure 17.

Can the OPA363ID operate with a 1.8-V supply and still achieve rail-to-rail output swing?

Yes, the OPA363ID achieves rail-to-rail output swing - within 10 mV of both V+ and V– - even at 1.8-V supply. This is verified in the Electrical Characteristics table (Section 7.9) and Typical Characteristics (Figure 9), enabling full dynamic range utilization in ultra-low-voltage systems such as energy-harvesting sensors and coin-cell-powered wearables using the OPA363ID.

What is the input common-mode voltage range specification for the OPA363ID?

The OPA363ID supports an input common-mode voltage range from (V–) – 0.1 V to (V+) + 0.1 V, as stated in Section 7.9 of the SBOS259F datasheet. This rail-to-rail input capability allows direct interfacing with sensors whose output swings beyond the supply rails - for example, AC-coupled microphone signals biased at V+/2 - without external level-shifting circuitry.