Texas Instruments OPA2336U

Overview

OPA2336U from Texas Instruments is a dual, single-supply, microPower CMOS operational amplifier optimized for battery-powered instrumentation. It features rail-to-rail output swing within 3 mV of rails (RL = 100 kΩ), 20 µA quiescent current per amplifier, 125 µV max input offset voltage, and operates from 2.3 V to 5.5 V supply. It is used in portable medical sensors and photodiode pre-amplifiers requiring ultra-low power and high-impedance signal conditioning.

For engineers reviewing the OPA2336U datasheet, OPA2336U pinout, OPA2336U application, or OPA2336U equivalent, key selection criteria include its 1 pA input bias current, 115 dB open-loop gain, 100 kHz gain-bandwidth product, rail-to-rail output capability at microPower consumption, and SOIC-8 packaging for legacy board compatibility.

Technical Context

The OPA2336U implements a CMOS input stage with common-mode input range extending to the negative rail (V–) – 0.2 V, enabling true single-supply operation. Its unity-gain stable architecture supports precision integrators and high-impedance transimpedance configurations without external compensation.

Each amplifier channel operates independently with no crosstalk, delivering 76 dB minimum CMRR over temperature and 100 dB minimum open-loop gain into 25 kΩ loads. The device maintains rail-to-rail output swing across –40°C to +85°C, with output voltage limited to within 20 mV of rails under 25 kΩ load and ≥90 dB AOL.

Key Specifications

Pinout & Package

OPA2336U is housed in an industry-standard SOIC-8 surface-mount package (Package Drawing D), compatible with automated assembly and legacy PCB footprints.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual, microPower, rail-to-rail op-amp applications.

Compared with OPA2336U, OPA2340UA delivers 55× more bandwidth at 10× higher current, while MCP6022-I/SN trades offset voltage and power for broader availability and lower unit cost-making OPA2336U optimal for ultra-low-power, high-precision DC measurement where every microamp and microvolt matters.

Availability

OPA2336U is available at Aetrix Electronics and suitable for battery-powered medical sensors, photodiode pre-amplifiers, and precision integrators requiring stable component supply across long production lifecycles.

Supply support for OPA2336U 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 op-amps and low-power signal chains.

The OPA2336U belongs to TI's microAmplifier™ series, designed specifically for ultra-low-power, high-accuracy analog signal conditioning in portable and battery-operated instrumentation.

FAQ

What is the maximum operating supply voltage for the OPA2336U?

The OPA2336U has an absolute maximum supply voltage of 7.5 V, but it is specified for reliable operation from 2.3 V to 5.5 V. Operating above 5.5 V risks exceeding internal junction limits and invalidates parametric guarantees. For 5 V systems, the OPA2336U delivers full rail-to-rail output swing and 115 dB open-loop gain as documented in the SBOS068C datasheet.

Does the OPA2336U support true rail-to-rail input common-mode range?

No-the OPA2336U supports rail-to-rail *output*, but its input common-mode range extends only to (V–) – 0.2 V and (V+) – 1 V. This means the inputs can go slightly below ground in single-supply use but cannot reach the positive rail. The OPA2336U does not exhibit phase inversion when inputs exceed supplies, unlike older bipolar op-amps, making it robust for transient overvoltage conditions.

Can the OPA2336U drive capacitive loads, and what is the recommended approach?

Yes-the OPA2336U can drive capacitive loads up to ~300 pF in unity-gain configuration. For larger loads, TI recommends inserting a 50 Ω to 100 Ω resistor inside the feedback loop (between output and inverting input). This maintains DC accuracy while improving phase margin. With RL = 25 kΩ, the OPA2336U remains stable with >1000 pF loads when using this technique, as verified in Figure 4 of SBOS068C.

What is the thermal resistance (θ_JA) of the OPA2336U in SOIC-8 package?

The OPA2336U in SOIC-8 (Package D) has a thermal resistance θ_JA of 150°C/W, measured under standard JEDEC JESD51-2 conditions (single-layer 1-in² copper pad). This value assumes no additional PCB copper heatsinking. At 20 µA per amplifier (40 µA total), self-heating is negligible (<0.6°C rise), making thermal derating unnecessary in ambient temperatures up to +85°C.

Is the OPA2336U pin-compatible with other members of the OPA336 family?

Yes-the OPA2336U shares identical pinout with all dual-version variants (e.g., OPA2336EA in MSOP-8 and OPA2336P in DIP-8), differing only in package dimensions and marking. The SOIC-8 footprint (Pin 1 = Out A, Pin 4 = V–, Pin 5 = +In B, Pin 8 = V+) is consistent across OPA2336U, OPA2336UA, and OPA2336U/2K5G4, enabling drop-in replacement in existing designs without layout changes.