Texas Instruments OPA2377AID

Overview

OPA2377AID from Texas Instruments is a dual, rail-to-rail output CMOS operational amplifier optimized for low-voltage, single-supply operation (2.2V to 5.5V), featuring 5.5MHz gain-bandwidth product, 7.5nV/√Hz input voltage noise at 1kHz, 0.2pA typical input bias current, and 1mV maximum offset voltage. It serves as a precision signal conditioner in photodiode preamplifiers, sensor interfaces, and active filters.

For engineers reviewing the OPA2377AID datasheet, OPA2377AID pinout, OPA2377AID application, or OPA2377AID equivalent, key selection criteria include its ultra-low input bias current for high-impedance sources, low-noise performance in sub-10kHz bandwidths, rail-to-rail output swing within 20mV of rails, and EMI filtering for robust operation in noisy environments.

Technical Context

The OPA2377AID implements a unity-gain stable CMOS input stage with internal EMI filtering (–3dB at ~75MHz) and diode-clamped inputs rated for ±0.5V beyond supply rails. Its input common-mode range extends 100mV beyond both rails, supporting true single-supply operation with V_CM from (V–) – 0.1V to (V+) + 0.1V.

It delivers 2V/µs slew rate, 0.33ms overload recovery time, and maintains >112dB open-loop gain (A_OL) across temperature. Channel separation exceeds 100dB at 1kHz, enabling independent dual-channel operation without crosstalk in precision instrumentation.

Key Specifications

Pinout & Package

OPA2377AID is packaged in an 8-pin SOIC (D) package with standard pinout and thermal pad connected to V–. The device uses industry-standard SOIC-8 footprint (5.3mm × 6.2mm, 1.27mm pitch).

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA2377AID, OPA2377AIDGKR offers identical performance in a smaller footprint but requires tighter layout control, while OPA2333AIDR trades bandwidth and noise for near-zero drift-making it optimal for static-signal applications where OPA2377AID's 5.5MHz GBW and 7.5nV/√Hz noise are unnecessary.

Availability

OPA2377AID is available at Aetrix Electronics and suitable for photodiode preamplifiers, piezoelectric sensor interfaces, and active filter designs requiring stable component supply across industrial temperature ranges (–40°C to +125°C).

Supply support for OPA2377AID 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 emphasis on precision, power efficiency, and reliability.

The OPA2377AID belongs to TI's OPA377 family of low-noise, low-input-bias-current CMOS op-amps designed specifically for high-fidelity signal conditioning in battery-powered and single-supply systems.

FAQ

What is the operating temperature range for the OPA2377AID?

The OPA2377AID is specified for continuous operation from –40°C to +125°C. This extended industrial temperature range is validated per TI's production testing and applies to all electrical parameters in the datasheet, including input bias current, offset voltage, and gain-bandwidth product. The SOIC-8 package's thermal resistance (θ_JA = 150°C/W) supports reliable operation under full-load conditions within this range when mounted on standard FR-4 PCBs with adequate copper area.

Does the OPA2377AID require external compensation for unity-gain stability?

No, the OPA2377AID is internally compensated for unity-gain stability and remains stable in G = +1 configurations without external components. Its phase margin exceeds 60° at unity gain, as confirmed by TI's open-loop gain/phase plots. This eliminates the need for feedback capacitors or gain-setting resistors solely for stability-simplifying design in buffer and follower applications where OPA2377AID is commonly deployed.

Can the OPA2377AID drive capacitive loads directly?

Yes, the OPA2377AID can directly drive up to 250pF of pure capacitive load in unity-gain configuration while maintaining stability. For larger loads or mixed R-C loads, TI recommends adding a 10Ω–20Ω series resistor at the output (RS) to isolate the amplifier from the capacitance. This preserves DC accuracy and output swing while eliminating ringing-critical when driving ADC input capacitors or long PCB traces where OPA2377AID's low output impedance must be managed.

What is the significance of the EMI filtering in the OPA2377AID?

The OPA2377AID integrates internal EMI filtering with a –3dB cutoff near 75MHz to suppress high-frequency electromagnetic interference that could otherwise rectify at internal junctions and cause DC offset shifts. This feature is especially valuable in automotive, industrial, and medical environments where OPA2377AID interfaces with noisy switching regulators or RF transceivers-ensuring baseline accuracy remains unaffected during EMI exposure without requiring external RC filters.

How does the input common-mode voltage range of the OPA2377AID support single-supply operation?

The OPA2377AID's input common-mode voltage range extends from (V–) – 0.1V to (V+) + 0.1V, allowing inputs to operate 100mV beyond both supply rails. This enables true single-supply operation-for example, with V– = 0V and V+ = 3.3V, inputs can swing from –0.1V to +3.4V-eliminating the need for level-shifting circuitry when interfacing with sensors or DACs whose outputs exceed the supply rails. This capability is explicitly verified across temperature and supply voltage for OPA2377AID.